HomeMy WebLinkAbout01-21-25 EO&WR Committee Packet
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OTAY WATER DISTRICT
ENGINEERING, OPERATIONS, & WATER RESOURCES COMMITTEE MEETING
and
SPECIAL MEETING OF THE BOARD OF DIRECTORS
2554 SWEETWATER SPRINGS BOULEVARD
SPRING VALLEY, CALIFORNIA
BOARDROOM
TUESDAY
JANUARY 21, 2025
12:00 P.M.
This is a District Committee meeting. This meeting is being posted as a special meeting
in order to comply with the Brown Act (Government Code Section §54954.2) in the event that
a quorum of the Board is present. Items will be deliberated, however, no formal board actions
will be taken at this meeting. The committee makes recommendations
to the full Board for its consideration and formal action.
AGENDA
1. ROLL CALL
2. PUBLIC PARTICIPATION – OPPORTUNITY FOR MEMBERS OF THE PUBLIC TO
SPEAK TO THE BOARD ON ANY SUBJECT MATTER WITHIN THE BOARD’S JU-
RISDICTION INCLUDING AN ITEM ON TODAY’S AGENDA
DISCUSSION ITEMS
3. AUTHORIZE THE GENERAL MANAGER TO ENTER INTO AN AGREEMENT WITH
M-RAE ENGINEERING, INC. FOR THE REPAIR OF THE LEAK AND FIRE HY-
DRANT/BLOW OFF VALVE REMOVAL ON TELEGRAPH CANYON ROAD, BE-
TWEEN PASEO RANCHERO AND BUENA VISTA WAY, CITY OF CHULA VISTA, IN
AN AMOUNT NOT-TO-EXCEED $171,600 (CHARLES MEDEROS) [5 MINUTES]
4. UPDATE ON THE DISTRICT’S INVENTORY PROJECT OF CUSTOMER-OWNED
SERVICE LINES AS MANDATED BY THE U.S. ENVIRONMENTAL PROTECTION
AGENCY’S LEAD AND COPPER RULE REVISIONS (JAKE VACLAVEK)
[5 MINUTES]
5. UPDATE ON THE 2022 WATER FACILITIES MASTER PLAN UPDATE AND ASSO-
CIATED PROGRAM ENVIRONMENTAL IMPACT REPORT (BETH GEN-
TRY/MICHAEL LONG) [10 MINUTES]
6. AUTHORIZE THE GENERAL MANAGER TO ISSUE A PURCHASE ORDER TO MU-
NIQUIP, LLC FOR THE PURCHASE OF A SIMFLO VERTICAL TURBINE PUMP FOR
THE 711 PUMP STATION IN AN AMOUNT NOT-TO-EXEED $156,000 (JEFF MAR-
CHIORO/BETH GENTRY) [5 MINUTES]
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7. AUTHORIZE THE GENERAL MANAGER TO APPROVE TO INCREASE THE CIP
R2117 BUDGET (RALPH W. CHAPMAN WATER RECLAMATION FACILITY DISIN-
FECTION SYSTEM IMPROVEMENTS PROJECT) BY AN AMOUNT NOT-TO-
EXCEED $550,000 (FROM $4,275,000 TO $4,825,000; AND AUTHORIZE THE
GENERAL MANAGER TO EXECUTE THE THIRD AMENDMENT TO THE PROFES-
SIONAL SERVICES AGREEMENT WITH CAROLLO ENGINEERS, INC. FOR ENGI-
NEERING SERVICES DURING CONSTRUCTION IN AN AMOUNT NOT-TO-
EXCEED $100,000 (FROM $532,569 TO $632,569) (KEVIN CAMERON/MICHAEL
LONG) [5 MINUTES]
BOARD MEMBERS ATTENDING:
Francisco Rivera, Chair
Mark Robak
All items appearing on this agenda, whether or not expressly listed for action, may be delib-
erated and may be subject to action by the Board.
The agenda, and any attachments containing written information, are available at the Dis-
trict’s website at www.otaywater.gov. Written changes to any items to be considered at the
open meeting, or to any attachments, will be posted on the District’s website. Copies of the
agenda and all attachments are also available by contacting the District Secretary at (619)
670-2253.
If you have any disability which would require accommodation in order to enable you to par-
ticipate in this meeting, please call the District Secretary at 619-670-2253 at least 24 hours
prior to the meeting.
Certification of Posting
I certify that on January 16, 2025, I posted a copy of the foregoing agenda near the
regular meeting place of the Board of Directors of Otay Water District, said time being at least
24 hours in advance of the meeting of the Board of Directors (Government Code Section
§54954.2).
Executed at Spring Valley, California on January 16, 2025.
/s/ Tita Ramos-Krogman, District Secretary
STAFF REPORT
TYPE MEETING: Regular Board MEETING DATE: February 5, 2025
SUBMITTED BY: Charles Mederos
Utility Services Manager
PROJECT: Various DIV. NO. 2
APPROVED BY: Andrew Jackson, Chief of Water Operations
Jose Martinez, General Manager
SUBJECT: AWARD CONTRACT TO M-RAE ENGINEERING, INC. FOR THE TELEGRAPH
CANYON ROAD FIRE HYDRANT/BLOWOFF VALVE REMOVAL PROJECT IN AN
AMOUNT NOT-TO-EXCEED $171,600.00
GENERAL MANAGER’S RECOMMENDATION:
That the Otay Water District (District) Board of Directors (Board)
authorize the General Manager to enter into an agreement with M-Rae
Engineering, Inc. (M-Rae) for the repair of the leak and fire
hydrant/blow off valve removal on Telegraph Canyon Road, between Paseo
Ranchero and Buena Vista Way, located in the City of Chula Vista, in an
amount not-to-exceed $171,600.00.
COMMITTEE ACTION:
Please see Attachment A.
PURPOSE:
To obtain Board authorization for the General Manager to enter a
construction contract with M-Rae Engineering for the Telegraph Canyon
Fire Hydrant/Blowoff Valve Removal Project in an amount not-to-exceed
$171,600.00.
AGENDA ITEM 3
2
ANALYSIS:
On Wednesday, April 24, 2024, at approximately 3:00 p.m., the District
received a report from the City of Chula Vista regarding water surfacing
on Telegraph Canyon Road, between Paseo Ranchero and Buena Vista Way.
District staff promptly responded and identified a hydrant valve leaking
from its casing. To address the issue, it was necessary to isolate the
711 Pressure Zone and the associated 20-inch asbestos cement pipe to
contain the leak.
Upon further investigation, staff determined that repairing the water
valve on Telegraph Canyon Road would be extensive and beyond the
District's capabilities due to its significant depth of over 17 feet.
This type of repair compels additional excavation and specialized
shoring equipment to fully expose the valve and create sufficient
working space. The scope of work and associated costs are estimated to
exceed the General Manager’s authorization of $75,000 for labor and
equipment alone.
The isolated section of the 20-inch main line is the redundant source
that feeds the western and southern 711 Pressure Zone, such as
residential homes, condominiums, and the Heritage Elementary School.
Restoring the main line to service is crucial to ensure system
redundancy and maintain an uninterrupted water supply to the affected
areas. According to the as-built, the fire hydrant valve was installed
on January 6, 1992, and is approximately 17-feet deep.
Staff determined that it is best to remove both the damaged fire hydrant
and the leaking valve. The fire hydrant has been struck three times
since 2017, and these incidents may have contributed to the valve's
leakage. Removing the hydrant will eliminate future costs associated
with recurring repairs and potential risks from vehicular impacts. Staff
coordinated with the City of Chula Vista and obtained written support
from the Deputy Fire Marshal approving the planned removal of the fire
hydrant. Additionally, there is an existing fire hydrant nearby. The
repair work will require removing the existing asphalt, excavating 17
plus feet to expose the existing fire hydrant valve, install appropriate
shoring for the type of excavation, expose 20-inch pipe and measure
Outside Diameter (OD) of existing pipe, remove the existing fire hydrant
valve, install a blind flange, pour a trust block, cut and plug and
abandon the existing six-inch pipe, and bring the road back to existing
conditions, according to the City of Chula Vista’s code requirements.
Staff designed and prepared the bid documents in-house. In accordance
with the District’s Purchasing Policy, the Engineering Department
conducted a formal bid process and bids were solicited on Wednesday,
December 10, 2024, via PlanetBids (the District’s online bid
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solicitation portal) and the District’s website. Three (3) prospective
contractors attended a non-mandatory pre-bid conference meeting on
Wednesday, December 18, 2024. Bids were received through PlanetBids on
Tuesday, January 7, 2025, and publicly opened with the following
results:
Bidder Amount
M-RAE ENGINEERING, INC. $171,600.00
BONITA PIPELINE, INC. $179,143.00
PALM ENGINEERING CONSTRUCTION, INC. $183,300.00
HEMET MANUFACTURING, INC. $352,940.00
BURTECH PIPELINE, INC. $455,000.00
The Engineer's Estimate is $180,000.
Unit costs were calculated from previous repairs.
A review of the bids was performed by District staff for conformance
with the contract requirements and it was determined that M-Rae was a
responsive and responsible bidder. M-Rae holds a Class A Contractor’s
License in the State of California, which meets the contract
document’s requirements and is valid through April 30, 2026. M-Rae
submitted the Company Background and Company Safety Questionnaire, as
required by the contract documents. The reference checks indicated a
good to excellent performance record on similar projects. An internet
background search of the company was performed and revealed no
outstanding issues with this company. The proposed Project Manager
has experience in California on similar projects and received
excellent recommendations. M-Rae has previously worked with the
District.
Staff verified that the bid bond provided by Merchants Bonding
Company (Mutual) is valid. Upon Board approval, M-Rae will sign the
contract, furnish the performance bond and labor and materials bond,
and staff will verify both bonds prior to fully executing the
contract.
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Staff recommends that the Board authorizes the General Manager to enter
into an agreement with M-Rae in an amount not-to-exceed $171,600.00
Fire Hydrant/Blowoff Valve Removal on Telegraph Canyon Road Project.
FISCAL IMPACT: Joe Beachem, Chief Financial Officer
Based on a review of the Operating Budget, funds in the Utility
Maintenance FY 2025 Operating Budget are sufficient to cover these
costs.
STRATEGIC GOAL:
This Project supports the District’s Mission statement, “To provide
exceptional water and wastewater service to its customers, and to manage
District resources in a transparent and fiscally responsible manner”
and the General Manager’s Vision, "To be a model water agency by
providing stellar service, achieving measurable results, and
continuously improving operational practices."
LEGAL IMPACT:
None.
Attachments: Attachment A – Committee Action
Attachment B – Photos of Leaking Valve and Fire Hydrant
Exhibit A – Location Map
ATTACHMENT A
SUBJECT/PROJECT: AWARD CONTRACT TO M-RAE ENGINEERING, INC. FOR THE TELEGRAPH
CANYON ROAD FIRE HYDRANT/BLOWOFF VALVE REMOVAL PROJECT IN
AN AMOUNT NOT-TO-EXCEED $171,600.00
COMMITTEE ACTION:
The Engineering, Operations, and Water Resources Committee reviewed
this item at a meeting held on January 21, 2025, and the following
comments were made:
NOTE:
The “Committee Action” is written in anticipation of the Committee
moving the item forward for board approval. This report will be sent
to the Board as a committee approved item, or modified to reflect any
discussion or changes as directed from the committee prior to
presentation to the full board.
ATTACHMENT B
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TELEGRAPH CANYON VALVE LEAKLOCATION MAP
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STAFF REPORT
TYPE MEETING: Regular Board MEETING DATE: February 5, 2025
SUBMITTED BY: Jake Vaclavek,
System Operations Manager
PROJECT: Various DIV. NO. ALL
APPROVED BY: Andrew Jackson, Chief of Operations
Jose Martinez, General Manager
SUBJECT: INFORMATIONAL ITEM – SERVICE LINE MATERIAL INVENTORY OF
CUSTOMER-OWNED SERVICE LINES
GENERAL MANAGER’S RECOMMENDATION:
None. This is an informational item only.
COMMITTEE ACTION:
Please see Attachment A.
PURPOSE:
To update the Board on the District’s inventory project of customer-
owned service lines as mandated by the United States Environmental
Protection Agency’s Lead and Copper Rule Revisions.
ANALYSIS:
The Lead and Copper Rule (Rule) is a National Primary Drinking Water
Regulation that went into effect in 1991. The Rule’s main purpose was
for public water systems to reduce levels of lead and copper in
drinking water.
On January 15, 2021, the Environmental Protection Agency published
the Lead and Copper Rule Revisions with the deadline to comply with
AGENDA ITEM 4
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the revised requirements that were related to service line material
inventories being due by October 16, 2024. This update is intended to
provide details on the District’s approach on fulfilling this
mandate.
FISCAL IMPACT: Joe Beachem, Chief Financial Officer
No fiscal impact as this is an informational item only.
STRATEGIC GOAL:
This Project helps to maintain regulatory mandate compliance and
helps support the District’s Mission Statement, “To provide
exceptional water and wastewater service to its customers, and to
manage District resources in a transparent and fiscally responsible
manner.”
LEGAL IMPACT:
None.
Attachments: Attachment A – Committee Action
Attachment B – Presentation
ATTACHMENT A
SUBJECT/PROJECT:
INFORMATIONAL ITEM – SERVICE LINE MATERIAL INVENTORY OF
CUSTOMER-OWNED SERVICE LINES
COMMITTEE ACTION:
The Operations and Engineering Committee reviewed this item at a
meeting held on January 21, 2025, and the following comments were
made:
NOTE:
The “Committee Action” is written in anticipation of the Committee
moving the item forward for board approval. This report will be sent
to the Board as a committee approved item, or modified to reflect any
discussion or changes as directed from the committee prior to
presentation to the full board.
Lead and Copper Rule
Revisions Service Line
Material Inventory
Jake Vaclavek
System Operations Manager
ATTACHMENT B
Background
•The Lead and Copper Rule (LCR) is a National Primary
Drinking Water Regulation that went into effect in
1991.
•January 15, 2021- Lead and Copper Rule Revisions
(LCRR) published.
•December 17, 2021- US EPA committed to revise
the LCRR by October 2024 with the Lead and
Copper Rule Improvements (LCRI).
•Service Line Material Inventory component
of LCRR deadline did not change (October
16, 2024).
Background (continued)
•Lead and Copper Rule Revisions require all
public water systems to:
•Prepare and submit a service line
inventory plan for State approval
(SWRCB).
•Conduct the inventory per the plan and
submit to the State by October 16, 2024.
•Public notification (statement on District
website).
Challenges
•October 2024 due date of Inventory was established on December 17, 2021.
•Federal guidance on acceptable inventory practices established August
2022:
•State guidance on acceptable inventory practices February 2023.
•Public water systems had about 20 months to meet the
requirements of the LCRR.
•No grant funding opportunities for costs associated with
inventory.
•Inventories of privately-owned plumbing – new concept for
water agencies.
Approach
•Collaboration with neighboring
agencies in plan approach.
•District plan developed - State
approved June 2023.
•Mobile app and GIS database for field
surveys finalized.
•Staff training for conducting field
surveys.
•Field surveys began on July 19, 2023.
Inventory Methodology Used
State lead ban of pipes
and solder January 1986
Private service lines
installed after January 1,
1988 - deemed lead free =
approx. 31,000
Pre-1998 service lines =
21,019 subject to
inventory
Statistical sample size =
2,155 to field verify -
95% confidence meets
State requirement
Field Surveys
Performed in-house
Mobile app for data collection
Progress managed using GIS Dashboard
QA/QC of data via GIS
Service Line Editor
Allowed for QA/QC to be
done at same time data was
being collected
Field surveys completed on May 7, 2024 (10
months)
Second round of QA/QC conducted prior to
submittal to SWRCB (no lead found)
Teamwork Makes the
Dream Work
Several years of planning, preparing, and execution
Inter-agency networking/progress updates
Collaboration of District Departments (Engineering, GIS, Meter Services,
Communications, Operations)
What’s Next?
•SWRCB guidance on LCRI (Spring/Summer 2025):
•Lead and copper monitoring enhancements.
•School and daycare list to SWRCB.
•Updates to service line inventory.
Questions?
STAFF REPORT
TYPE MEETING: Regular Board MEETING DATE: February 5, 2025
SUBMITTED BY: Beth Gentry
Engineering Manager
PROJECT: P1210 -
021000
DIV. NO. All
APPROVED BY: Michael Long, Chief, Engineering
Jose Martinez, General Manager
SUBJECT: Informational Item – Final Draft of the 2022 Water Facilities
Master Plan Update and Program Environmental Impact Report
GENERAL MANAGER’S RECOMMENDATION:
No recommendation. This is an informational item only.
COMMITTEE ACTION:
Please see Attachment A.
PURPOSE:
To provide the Board information on the 2022 Water Facilities Master
Plan (WFMP) Update and associated Program Environmental Impact Report
(PEIR).
AGENDA ITEM 5
2
ANALYSIS:
In September 2021, the Board awarded a professional engineering
planning services agreement to Hazen Sawyer, Inc. for the preparation
of the 2022 Water Facilities Master Plan (WFMP) and Program
Environmental Impact Report (PEIR) in an amount not to exceed
$569,785. The 2022 WFMP Update analyzed 2020 data to determine
current and projected population and demands for the District’s
potable and recycled water systems. Further analyses included an
assessment of the operational and contingency criteria to ensure
reliable and efficient operation throughout buildout. Through this
process, potable and recycled water projects that are needed to meet
the criteria were identified and prioritized to assist in the
development of the District’s Capital Improvement Program (CIP).
In January 2024, the State of California purchased the property
planned for the development of Otay Ranch Village 14 for permanent
conservation land. This change to conservation land resulted in
significant reductions in buildout flows, affecting multiple projects
(e.g., reservoir and pipeline sizing and the north/south connector).
Considering the change, staff evaluated the options for moving
forward with the WFMP Update and associated PEIR.
The main options considered included (1) re-evaluating the plan to
account for changed land use, and (2) finalizing the report as a
“Draft”, including Village 14 flows. Since the WFMP and PEIR are
updated on a 5-to-10-year frequency, it was decided to complete the
2022 WFMP Update without additional analyses of Village 14
reductions. The additional analysis would have incurred extra cost
and the underlying population and demand data was becoming outdated.
This option saved money that could be invested in a comprehensive
update in the next WFMP. The new/changed projects in the 2022 WFMP
Update, which were not included in the 2015 WFMP, were impacted by
the reduction in buildout flows. Given that these projects would not
move forward as initially proposed, staff decided not to pursue the
corresponding environmental analysis or PEIR, as an updated PEIR
would only benefit new/changed projects. Instead, the projects that
reflect the current reduced conditions would be scoped in the next
WFMP and then environmental analyses would be completed for these
projects. Additionally, project costs were not included in the 2022
WFMP Update but will be updated during the budget cycle for the next
WFMP update.
The analysis in the updated plan identified reductions across nearly
all land use categories, as shown in Table 1. This reduction in
flows for land use is a key takeaway from the 2022 WFMP Update,
indicating that capital projects are on track or ahead of schedule to
meet demand.
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Table 1. Potable and Recycled Land Use Flows 2015 vs 2022 WFMP
The decision to keep the 2022 WFMP Update in final draft resulted in
over $200,000 in unspent funds from the Hazen Sawyer contract, which
will be available for the next WFMP Update. The 2022 WFMP Final
Draft update provides a comprehensive review, reflecting the latest
census data and demand patterns representative of the post-COVID
shutdown period.
The 2022 WFMP Final Draft also provides a snapshot of the proposed
CIP projects and their prioritization. The Final Draft does not
include an associated PEIR; thus, projects not included in the 2015
PEIR would require individual consideration under the California
Environmental Quality Act (CEQA) if the project goes forward before
the next update with the associated PEIR.
In summary, the 2022 WFMP Update will remain in Final Draft without
the accompanying PEIR. The next WFMP Update consultant solicitation
is underway and anticipated for presentation at the March Board
meeting.
Land
Use
Code
Land Use Type
2015 WRMP
Total Unit
Demand
2022 MP
Total
Unit Demand
Recycled
Water
Reduction
Factor
2022 MP
Adjusted
Potable
Unit Demand
VL
SFR Rural Estate
Very Low Residential
(<1 DU/ac) (1-in. or larger meter)
1,000 gpd/DU 800 gpd/DU 0%800 gpd/DU
L
SFR Custom Lot
Low Density Residential
(1-3 DU/ac) (1-in. meter)
700 gpd/DU 500 gpd/DU 0%500 gpd/DU
M
SFR Standard
Medium-Density Residential
(4-10 DU/ac typ.) (3/4-in. meter)
435 gpd/DU 300 gpd/DU 15%255 gpd/DU
HD
MFR
High-Density Residential
(typ >10 DU/ac)
200 gpd/DU 150 gpd/DU 15%128 gpd/DU
E School 1,785 gpd/ac 1,500 gpd/ac 20%1,200 gpd/ac
R Church / Religious Facility 1,785 gpd/ac 1,500 gpd/ac 20%1,200 gpd/ac
CPF Community Purpose Facility 893 gpd/ac 750 gpd/ac 20%600 gpd/ac
HP Hospital / Medical Facility 3,035 gpd/ac 2,500 gpd/ac 20%2,000 gpd/ac
C Commercial 1,785 gpd/ac 1,500 gpd/ac 10%1,350 gpd/ac
I(W)
Industrial, specific to warehouse
industrial common in Otay Mesa;
other Industrial per custom
analysis
893 gpd/ac 850 gpd/ac 5%808 gpd/ac
IRR Irrigation 1,900 gpd/ac 1,900 gpd/ac 0%1,900 gpd/ac
4
FISCAL IMPACT: Joe Beachem, Chief Financial Officer
None.
STRATEGIC GOAL:
This Project supports the District’s Mission statement, “To provide
exceptional water and wastewater service to its customers, and to
manage District resources in a transparent and fiscally responsible
manner,” and the General Manager’s Vision, "To be a model water
agency by providing stellar service, achieving measurable results,
and continuously improving operational practices."
LEGAL IMPACT:
No legal impact is anticipated.
BG/ML:jf
Attachments: Attachment A – Committee Action
Attachment B – Final Draft 2022 WFMP Update
ATTACHMENT A
SUBJECT/PROJECT:
P1210-021000 Informational Item – Final Draft of the 2022 Water
Facilities Master Plan Update and Program Environmental
Impact Report
COMMITTEE ACTION:
The Engineering, Operations, and Water Resources Committee (Committee)
reviewed this informational item at a meeting held on January 21,
2025.
NOTE:
The “Committee Action” is written in anticipation of the Committee
moving the item forward for Board approval. This report will be sent
to the Board as a Committee approved item, or modified to reflect any
discussion or changes as directed by the Committee prior to
presentation to the full Board.
OTAY WATER DISTRICT
Final Draft 2022 Water Facilities
Master Plan Update
Prepared for
Otay Water District
2554 Sweetwater Springs Boulevard Spring Valley, California 91978--2004
Prepared by
Otay Water District In consultation with
Hazen and Sawyer
2024
ATTACHMENT B
Otay Water Facilities Master Plan Update Page i 2024
Contents
Chapter 1 Introduction ........................................................................................................... 1-1
1.1 Overview ............................................................................................................. 1-1
1.2 District Overview ................................................................................................ 1-2
1.3 Planning Context/Baseline Supply Conditions/Key Issues .................................. 1-6
1.4 Report Outline and Synopsis ............................................................................... 1-8
1.5 References .......................................................................................................... 1-8
Chapter 2 System Criteria ....................................................................................................... 2-1
2.1 Overview ............................................................................................................. 2-1
2.2 Potable Water Planning Criteria ......................................................................... 2-1
2.3 Recycled Water Planning Criteria ....................................................................... 2-7
Chapter 3 Water Demands ...................................................................................................... 3-1
3.1 Summary / Overview .......................................................................................... 3-1
3.2 Historical and Current Use .................................................................................. 3-3
3.3 Land Use and Demographic Projections ........................................................... 3-11
3.4 Projected Potable Water Demands .................................................................. 3-17
3.5 Projected Recycled Demands ........................................................................... 3-26
Chapter 4 Water Supply .......................................................................................................... 4-1
4.1 Overview ............................................................................................................. 4-1
4.2 Current Regional Water Supply and Drought Conditions ................................... 4-1
4.3 Current Portfolio of Potable Water Sources ....................................................... 4-9
4.4 Possible Future Supplies ................................................................................... 4-13
4.5 References ........................................................................................................ 4-14
Chapter 5 Potable Water System Evaluation ............................................................................ 5-1
5.1 Overview/Summary ............................................................................................ 5-1
5.2 Existing Water System ........................................................................................ 5-1
5.3 Distribution Storage and Pumping Analysis ...................................................... 5-20
5.4 Recommended Potable Water System Improvements…………………………………..5-30
Chapter 6 Recycled Water System Evaluation .......................................................................... 6-1
6.1 Overview/Summary ............................................................................................ 6-1
6.2 Recycled Water Supply ....................................................................................... 6-1
6.3 Existing RW System Overview ............................................................................ 6-7
6.4 Future System Overview ................................................................................... 6-13
6.5 Existing Storage and Pumping Analysis ............................................................ 6-13
6.6 Future 2055 Recycled Water System Analysis .................................................. 6-14
Otay Water Facilities Master Plan Update Page ii 2024
Chapter 7 Recommended Capital Improvement Program ......................................................... 7-1
7.1 Overview/Summary ............................................................................................ 7-1
7.2 Expansion, Betterment, Replacement, and Supply Offsets ................................ 7-2
7.3 Potable Water – Recommended CIP ................................................................... 7-3
7.4 Recycled Water – Recommended CIP ................................................................. 7-9
7.5 Water Supply Projects – Recommended CIP .................................................... 7-10
Appendices
A Water and Recycled Water Facilities Exhibits
B Planned Development Projects
C Baseline Per Unit Demand by Pressure Zone
D Other Demand Factors by Pressure Zone
E Water Unit Use and Duty Factors
Exhibits
I Existing and Proposed Potable Water Facilities – La Presa System
II Existing and Proposed Potable Water Facilities – Hillsdale System
III Existing and Proposed Potable Water Facilities – Regulatory System
IV Existing and Proposed Potable Water Facilities – Central Area System
V Existing and Proposed Potable Water Facilities – Otay Mesa System
VI Potable Hydraulic Profile Schematic
VII Existing and Proposed Recycled Water Facilities – Central Area System
VIII Recycled Hydraulic Profile Schematic
Tables
Table 1-1 Baseline Supply Conditions .............................................................................................. 1-6
Table 1-2 Key Planning Issues .......................................................................................................... 1-7
Table 2-1 Otay Water District Potable Water System Criteria ........................................................ 2-2
Table 2-2 Treated Water Storage Needs and District Criteria ......................................................... 2-6
Table 2-3 Summary of Recycled Water Demand Planning Criteria ................................................. 2-8
Table 3-1 Demographic and Water Demand Forecast Summary .................................................... 3-1
Table 3-2 Water Demand Forecasts from Recent District Master Plans ......................................... 3-2
Table 3-3 Historical Potable Demands ............................................................................................. 3-3
Table 3-4 Historical Recycled Demands ........................................................................................... 3-4
Table 3-5 Otay WD Billing Classifications and Associated Water Use Sectors ............................... 3-5
Table 3-6 Potable Water Customer Sales by Service Area and Customer Class (AFY)..................... 3-6
Table 3-7 Potable System Monthly Peaking Factors ....................................................................... 3-9
Table 3-8 Recycled System Monthly Peaking Factors ...................................................................... 3-9
Table 3-9 Historical and Projected Population for the Service Area ............................................. 3-13
Table 3-10 Key SANDAG Demographic Variables by Water Use ..................................................... 3-16
Otay Water Facilities Master Plan Update Page iii 2024
Table 3-11 Modified Forecast Factor Variable Definitions .............................................................. 3-18
Table 3-12 Summary of Explanatory Variables and Model Parameters .......................................... 3-20
Table 3-13 Additional Discussion of Future Water Use Changes .................................................... 3-21
Table 3-14 Percent Other Demands by Pressure Zone .................................................................... 3-22
Table 3-15 Conservation Per Year from District UWMP .................................................................. 3-22
Table 3-16 Summary of Baseline Scenario Data Sources and Assumptions .................................... 3-23
Table 3-17 Demographic and Water Demand Forecast Summary .................................................. 3-24
Table 3-18 Median Potable Forecast by Pressure Zone, System Area and District (AFY)................ 3-25
Table 3-19 Percent of Land Area Served by Recycled Water.......................................................... 3-26
Table 3-20 Projected Recycled Water Demand ............................................................................... 3-26
Table 4-1 SDCWA Pipeline 4 .......................................................................................................... 4-10
Table 4-2 SDCWA/Helix FCF Connections ...................................................................................... 4-12
Table 4-3 Possible Future Supplies ................................................................................................ 4-14
Table 5-1 District Pressure Zones .................................................................................................... 5-3
Table 5-2 North District Pump Stations ......................................................................................... 5-10
Table 5-3 South District Pump Stations ......................................................................................... 5-11
Table 5-4 North District Potable Water Storage Reservoirs .......................................................... 5-12
Table 5-5 South District Potable Water Storage Reservoirs .......................................................... 5-13
Table 5-6 North District Potable Pressure Reducing Stations ........................................................ 5-14
Table 5-7 South District Potable Pressure Reducing Stations ........................................................ 5-15
Table 5-8 Emergency Interconnections ......................................................................................... 5-19
Table 5-9 Existing North District Distribution Storage Analysis ..................................................... 5-21
Table 5-10 Existing South District Distribution Storage Analysis ..................................................... 5-21
Table 5-11 Existing North District Pump Stations Analysis .............................................................. 5-23
Table 5-12 Existing South District Pump Stations Analysis .............................................................. 5-23
Table 5-13 Phase II North District Distribution Storage Analysis ..................................................... 5-24
Table 5-14 Phase II South District Distribution Storage Analysis ..................................................... 5-25
Table 5-15 Phase II North District Pump Stations Analysis .............................................................. 5-26
Table 5-16 Phase II South District Pump Stations Analysis .............................................................. 5-26
Table 5-17 Phase III North District Distribution Storage Analysis .................................................... 5-27
Table 5-18 Phase III South District Distribution Storage Analysis .................................................... 5-28
Table 5-19 Phase III North District Pump Stations Analysis ............................................................. 5-29
Table 5-20 Phase III South District Pump Stations Analysis ............................................................. 5-29
Table 6-1 Recycled Water Supply - 2007 to 2022 ............................................................................ 6-6
Table 6-2 Recycled Water Pressure Zones ....................................................................................... 6-9
Table 6-3 Recycled Water Storage Reservoirs ................................................................................. 6-9
Table 6-4 Recycled Water Pump Stations ...................................................................................... 6-10
Table 6-5 Recycled Water Piping - Decade of Installation ............................................................. 6-10
Table 6-6 Recycled Water Piping - Diameter ................................................................................. 6-11
Table 6-7 Recycled Water Pressure Reducing Stations ................................................................. 6-12
Table 6-8 Existing Recycled Water Storage Analysis ..................................................................... 6-13
Otay Water Facilities Master Plan Update Page iv 2024
Table 6-9 Existing Recycled Water Pump Station Analysis ............................................................ 6-14
Table 7-1 Potable Water Storage CIP Projects ................................................................................. 7-4
Table 7-2 Potable Water Pump Station CIP Projects ....................................................................... 7-5
Table 7-3 Potable Water Pipeline CIP Projects ................................................................................ 7-6
Table 7-4 Recycled Water CIP Projects ............................................................................................ 7-9
Table 7-5 Water Supply Projects - Recommended CIP .................................................................. 7-10
Figures
Figure 1-1 Vicinity Map ..................................................................................................................... 1-3
Figure 1-2 Water Service Areas ......................................................................................................... 1-4
Figure 1-3 Future Developments ...................................................................................................... 1-5
Figure 2-1 Fire Severity Zones ........................................................................................................... 2-4
Figure 3-1 Historical and Projected District Total Water Demands .................................................. 3-2
Figure 3-2 Annual District Potable Water Use by Use Sector ........................................................... 3-6
Figure 3-3 Monthly Average Potable Water Consumption ............................................................... 3-8
Figure 3-4 Monthly Average Recycled Water Consumption ............................................................. 3-8
Figure 3-5 Potable System Estimated Average Annual Water Losses ............................................. 3-10
Figure 3-6 Location of Obtained MGRAs Relative to District Service Area Boundaries .................. 3-14
Figure 3-7 District Potable Pressure Zones ..................................................................................... 3-15
Figure 3-8 Example of MGRA Boundaries within District Pressure Zone/Service Area .................. 3-16
Figure 3-9 Projected Commercial, Industrial and Institutional (CII) Job Growth ............................ 3-17
Figure 3-10a SFR and MFR Baseline Per-Unit Demands .................................................................... 3-19
Figure 3-10b CII Baseline Per-Unit Demands ...................................................................................... 3-19
Figure 3-11 Projected Potable Water Demands ............................................................................... 3-24
Figure 3-12 Projected Recycled Water Demands ............................................................................. 3-27
Figure 4-1 MWD Sources of Supply................................................................................................... 4-4
Figure 4-2 Delivering Water to the District ....................................................................................... 4-5
Figure 4-3 Delta Conveyance Project ................................................................................................ 4-7
Figure 4-4 Otay Water Supply Sources Schematic .......................................................................... 4-11
Figure 5-1 Existing Potable Water Systems ....................................................................................... 5-2
Figure 5-2 Pipe Summary - Decade of Installation .......................................................................... 5-16
Figure 5-3 Pipe Summary - Diameter .............................................................................................. 5-17
Figure 6-1 Recycled Water Vicinity Map ........................................................................................... 6-2
Figure 6-2 Hydrologic Subarea .......................................................................................................... 6-5
Figure 6-3 Recycled Water Supply - 2007 to 2022 ............................................................................ 6-7
Figure 6-4 Recycled Water Piping - Decade of Installation ............................................................. 6-11
Figure 6-5 Recycled Water Piping - Diameter ................................................................................. 6-12
Otay Water Facilities Master Plan Update Page v 2024
Acronyms
ADD Average Day Demand
ADWF Average Dry Weather Flow
AFY Acre Feet per Year
AOI Area of Influence
BDCP Bay Delta Conservation Plan
CalFire California Department of Forestry and Fire Protection
CEQA California Environment Quality Act
cfs cubic feet per second
CIP Capital Improvement Program
CRA Colorado River Aqueduct
CVP Central Valley Project
DDW Division of Drinking Water
District Otay Water District
DPR Direct Potable Reuse
EIR Environmental Impact Report
EIS Environmental Impact Statement
ESP Emergency Storage Project
FCF Flow Control Facility
Fire Code California Fire Code
fps feet per second
gpm gallons per minute
HA Hydrographic Areas
HSA Hydrographic Subareas
HWL High Water Level
IID Imperial Irrigation District
IPR Indirect Potable Reuse
IRP Integrated Resources Plan
LAFCO San Diego Local Area Formation Commission
LMSE La Mesa-Sweetwater Extension
LOPS Lower Otay Pump Station
MAF Million Acre Feet
Master Plan Water Facilities Master Plan Update
MBR Membrane Bio-Reactor
MDD Maximum Demand Day
MG Million Gallons
MGD Million Gallons per Day
Otay Water Facilities Master Plan Update Page vi 2024
MWD Metropolitan Water District of Southern California
OMCDSP Otay Mesa Conveyance and Disinfection System Project
PEIR Programmatic Environmental Impact Report
PH Peak Hour
PPP Public-Private Partnerships
PRS Pressure Reducing Station
psi pounds per square inch
PZ Pressure Zone
RUWMP Regional Urban Water Management Plan
RWCWRF Ralph W. Chapman Water Reclamation Facility
SANDAG San Diego Association of Governments
SBWRF South Bay Water Reclamation Facility
SCADA Supervisory Control and Data Acquisition
SDCWA San Diego County Water Authority
SMWD Santa Margarita Water District
SPI Separation Processes, Inc.
SWRCB State Water Resources Control Board
TDS Total Dissolved Solids
UBC Uniform Plumbing Code
Otay Water Facilities Master Plan Update Page 1-1 2024
Chapter 1
INTRODUCTION
1.1 Overview
This report summarizes the findings and recommendations of the 2022 Water Facilities Master Plan
(WFMP) Update. Planning for the Master Plan is based on the regional growth forecasts developed by the
San Diego Association of Governments (SANDAG) and adopted land use plans of all jurisdictions within
the District boundaries. The District coordinates with these jurisdictions through its development of Urban
Water Management Plans, and through other ongoing coordination to ensure land use plans account for
the availability of water supplies and water service infrastructure. The WFMP utilizes existing data upon
which to base projections. During final drafting of the WFMP Update, the state purchased permanent
conservation land previously approved and planned as development, Village 14 and part of Village 16.
The reduction in flows potentially affected several projects planned to accommodate the development
and meet District criteria (e.g. pipeline locations, diameters, storage volumes and locations). Because the
change is so significant, this report will remain in Final Draft. The purpose of the Final Draft is to provide
a snapshot of District needs prior to the Village 14 conversion to permanent conservation land. Note
that projects needed to accommodate Village 14 flows remain in this final draft report and will be re-
evaluated in the next report. The planned eastern north-south interconnection was to be implemented
through the Village 14 development. Although the development is no longer moving forward the
interconnector should still be considered.
1. As part of the overall master planning process, the District normally prepares a Programmatic
Environmental Impact Report (PEIR) to evaluate the environmental effects and consequences of
the various CIP projects recommended in the Master Plan. The PEIR addresses environmental
issues common to the CIP as a whole, and where possible also addresses project-level effects of
near-term CIP projects, allowing these projects to proceed in an efficient, streamlined manner.
With several projects anticipated to change with the decreased demands as a result of the
removal of Village 14, efforts were stopped on the PEIR. Without accompanying environmental
documentation, the Board cannot take action on the WFMP Update. Remaining project funds
will be used for the next WFMP Update.The report includes a review of the District’s potable
and recycled water systems, and identifies a plan of capital improvements necessary for each
system to support future conditions as of 2022 including major planned land development
projects, while providing reliable and economical service to the District’s customers. In an effort
to manage resources and control costs this draft report does not include project costs. Several
projects are not anticipated to move forward and thus estimating costs would not be valuable.
However, projects in the existing budget will be updated during the budget process and the next
WFMP Update will include project cost estimates.The purpose of the Master Plan is:Update
Planning Criteria: Review and update, as necessary, the District’s system performance criteria.
2. Map Out Water and Recycled Water Facility Improvements: Identify and prioritize the District’s
facility needs, including transmission, storage, and pumping facilities, to serve projected future
conditions.
Chapter 1 Introduction
1.2 District Overview
Otay Water Facilities Master Plan Update Page 1-2 2024
3. Update the District’s Capital
Improvement Program: Update the
District’s near-term and long-term CIP,
based on a new demand forecast, supply
options and identified facility needs.
4. Identify Adaptive Responses to Changed
Conditions: Identify how needed facility
improvements and CIP items would change
should future demand and supply
conditions vary from baseline
assumptions.
Program Environmental Impact Report
The PEIR is a separate document prepared in
conformance with the requirements of the
California Environment Quality Act (CEQA). The
prior approved WFMP 2015 included a PEIR. Most
of the Projects identified in this updated WFMP were
included in the WFMP 2015 and remain applicable.
More information on projects and their CEQA
compliance is included in Chapter 7 – Recommended
Capital Improvement Program. 1.2 District Overview
The District is a publicly owned retail water and
sewer agency serving a 125.5 square mile portion of
southern San Diego County. The District boundaries
encompass a large portion of eastern Chula Vista, a portion of the city of San Diego on Otay Mesa, and
various unincorporated areas, including Rancho San Diego, Jamul, Spring Valley, Bonita, Otay Mesa, and
areas adjacent to El Cajon and La Mesa. The District’s boundaries/vicinity map, service areas and future
developments are shown in Figure 1-1, Figure 1-2 and Figure 1-3.
The District provides water service to almost all of the area within its boundaries, encompassing
approximately 240,000 residents and making the District the second largest water purveyor by
population1 in the county. The District provides sewer service only within the Jamacha drainage basin in
the northern portion of its service area, where it also operates a small water recycling plant. Sewer
service for the remainder of the area within the District boundaries is provided by other public entities.
The District also provides recycled water service, primarily within the eastern portion of the city of Chula
Vista, in the District’s Central service area.
The District was authorized as a California Special District by the State Legislature in 1956, under the
provisions of the Municipal Water District Code. A five-member elected Board of Directors sets
ordinances, policies, taxes, and rates for providing sewer, potable and recycled water services within the
District service area. The District is revenue neutral: each end user pays their fair share of the District’s
1 District population is different than the demand calculated population used in Section 3.
District Mission
“To provide exceptional water and wastewater services to its customers, and to manage District resources in a transparent and fiscally responsible manner” and the General Manager’s Vision, "To be a model water agency by providing stellar service, achieving measurable results, and continuously improve operational practices.”
Otay’s Past and Present
The District was originally formed in 1956 to make imported and local water supplies available to a portion of southeastern San Diego County. Today’s District is the result of the merger between the original Otay Municipal Water District and the smaller La Presa County Water District, which had formed in 1957 to provide water service to the communities of La Presa and south Spring Valley.
Since the two small water agencies shared a common service area, in 1962 they entered into a Joint Powers Agreement to make the best use of equipment, labor, management, and operations. The consolidation worked perfectly resulting in savings for water customers and the construction of a joint use facility. With the success of the combined operations, the two boards of directors voted unanimously to officially dissolve La Presa in 1969, with Otay Water District taking control of all of La Presa's assets, debts, and resources.
Today, the District serves the needs of its customers by purchasing imported water from SDCWA. Otay takes delivery of most of this water through several connections to large diameter pipelines owned and operated by SDCWA.
Chapter 1 Introduction
1.2 District Overview
Otay Water Facilities Master Plan Update Page 1-3 2024
costs of capital improvements, water acquisition, and the operation and maintenance of its facilities.
The District is a member agency of the San Diego County Water Authority (SDCWA). SDCWA is responsible
for transmission of the imported water supply within San Diego County to all its member agencies. SDCWA
is a member of the Metropolitan Water District of Southern California (MWD). The District receives
imported potable water from the aqueduct systems owned and operated by SDCWA and MWD. Through
agreements with neighboring water agencies, the District can also purchase potable water from local
water treatment plants. The District continues to be active in reducing demands through conservation
measures, and in pursuing new local and innovative sources of supply to increase system reliability,
flexibility, and economy.
Figure 1-1 District Vicinity Map
Chapter 1 Introduction
1.2 District Overview
Otay Water Facilities Master Plan Update Page 1-4 2024
Figure 1-2 Water Service Areas
Chapter 1 Introduction
1.2 District Overview
Otay Water Facilities Master Plan Update Page 1-5 2024
Figure 1-3 Future Developments
Chapter 1 Introduction
1.3 Planning Context/Baseline Supply Conditions/Key Issues
Otay Water Facilities Master Plan Update Page 1-6 2024
1.3 Planning Context/Baseline Supply
Conditions/Key Issues
This Master Plan builds on the District’s previous comprehensive 2015 Water Resource Master Plan
Update (Atkins 2016). It also interfaces with the District’s 2015 Integrated Resources Plan (IRP), which
defines a course for the District’s development of local water supply projects. To the extent the supply
plans identified in the IRP affect the planning of the District’s potable and recycled water systems, they
are incorporated into this Master Plan. The exclusion of potential IRP supply projects from the Master
Plan does not necessarily mean their development and implementation will not occur at some point in
the future, it just reflects the challenges currently associated with them make their inclusion unviable. As
conditions change, future Master Plans can reassess and update the recommendations.
Baseline Supply Conditions
Based on the information in the IRP and developments since it was completed, the Master Plan assumes
the water supply conditions listed in Table 1-1 will be in effect and defines these as baseline planning
assumptions. The primary CIP recommendations of the Master Plan are based on these assumptions. The
Master Plan also identifies how needed facility improvements and CIP projects could change should future
demand and supply conditions vary from the listed baseline assumptions.
Table 1-1 Baseline Supply Conditions
Baseline Supply Condition Description
Continued availability of recycled
water supply from City of San
Diego
The District currently purchases recycled water from the City of San Diego’s South Bay Water
Reclamation Facility (SBWRF), under the terms of an agreement that expires in 2026. The
Master Plan baseline condition assumes the agreement will be renegotiated and executed
and that recycled water will continue to be available to supply the District throughout the
plan’s horizon year.
Recycled water service to Central
service area only
The District currently serves recycled water only in its Central service area, covering most of
eastern Chula Vista. Through previous investigations, the District has determined recycled
service in its North District area is impracticable due to stringent requirements for use
upstream of Sweetwater Reservoir. Also, the District has long planned for future recycled
water service to its Otay Mesa service area in support of planned industrial development,
but based on a re-evaluation of costs, and on uncertainty as to the future supply availability
from the City of San Diego, has implemented a moratorium on additional expenditures
toward such a system. The Master Plan baseline condition assumes recycled water service
will be available to the Central service area only.
Continued availability of backup
supply from the City of San Diego’s
Otay Water Treatment Plant
Under the terms of an agreement with the City of San Diego, the District may purchase up to
10 MGD of regular or backup supply from the City of San Diego’s Otay WTP, as conveyed
using the District’s Lower Otay Pump Station (LOPS). The Master Plan baseline condition
assumes this agreement will remain in place throughout the plan’s horizon year.
Key Issues
Key issues affecting the development and recommendations of the Master Plan are listed in Table 1-2.
These include consideration of changed conditions relative to the District’s previous Master Plan,
including a marked decline in per capita water use, revisions to the District’s assumed future supply
portfolio, and other changes.
Chapter 1 Introduction
1.5 References
Otay Water Facilities Master Plan Update Page 1-7 2024
Table 1-2 Key Planning Issues
Issue Description Implications to WFMP
Decline in per capita
water use
■Potable use per account has declined
significantly especially compared to 2005-06
conditions. This reduced water usage was
initially anticipated to rebound after drought
and economic downturn conditions changed
but it has continued to indicate a long-term
trend.
■Reduces the need for capacity expansion and
treated water storage projects;
■Reduces potential demand that could drive
development of a new water supply
With and without a New
water supply from
Mexico
■The 2015 Master Plan incorporated a new
water supply from Mexico and the
infrastructure within the District to enable
this (Otay Mesa Conveyance project) as an
assumed future baseload supply. The
treatment plant in Rosarito, Mexico has not
moved past the planning stage and the
District’s participation is currently not
expected.
■The Otay Mesa Conveyance project has been
removed as an imminent CIP but will remain
as a future potential supply project as listed
in the IRP.
North-South Interconnect ■District planning has always assumed theeventual construction of a north-south interconnect to enhance service reliabilityand operational flexibility. The 2015 MasterPlan assumed moving water originating fromMexico without SDCWA Pipeline 4 usage which is now not expected.
■The north-south interconnection has been modified to consider obtaining water fromSWA as an additional supply to the South system rather than a separate pipelinerunning through SWA jurisdiction. Note that a re-evaluation of projects impacted byVillage 14, such as this one, will be done atthe next WFMP.
Treated water storage
volume, 10-day
reliability, and water
quality maintenance
■District criteria call for the ability to serve full
customer demands during a 10-day outage of
Pipeline 4, in any month of the year. Supplies
can be from treated water storage, District
local supplies, and water supply agreements
and interconnections with neighboring
agencies.
■Existing treated water storage reserves are
currently constrained by water quality
maintenance and other operating
considerations, such that the available
emergency storage reserve presented in past
master plans may be overstated.
■Demand growth, the mix of future supply
sources, water quality maintenance
considerations, the availability of backup
supply from the Otay WTP, and other factors
will all influence the Master Plan’s
assessment of the need for new and modified
treated water storage facilities.
■Water storage operations practice are
considered in design and planning criteria
updates to ensure the District is not over-
building treated water storage in the future.
Backup supply from
Otay WTP
■The District has an existing agreement with
the City of San Diego to purchase treated
water from the Otay WTP, provided the
water is surplus to the City’s needs. Due to
higher treatment transaction costs, the
District utilizes the agreement only during
aqueduct shutdowns and emergencies.
■Reliable backup supply availability from the
City may reduce the District’s need for
treated water storage.
■The District maintains a CIP for a new LOPS
facility to convey potable water directly
from the Otay WTP to the Central service
area.
Chapter 1 Introduction
1.5 References
Otay Water Facilities Master Plan Update Page 1-8 2024
1.4 Report Outline and Synopsis
The Master Plan report is organized into seven chapters as follows:
Chapter Contents Synopsis
1. Introduction ■Purpose
■District overview
■Key Issues
■Report outline
The Master Plan identifies the facilities and capital funding the District will
need to continue providing reliable water and recycled water service to its
customers through 2055.
2. System Criteria ■Water and recycled
system planning and
design criteria
The District’s planning criteria define the minimum levels of flow capacity,
storage capacity, and operational reliability required for the District to
provide excellent service to its customers. Because water service is a life-line
requirement, these criteria and service standards are necessarily and
appropriately high.
3. Water Demands ■ Historical, current, and
projected water
demands
Water demands have declined significantly in recent years due to
conservation and water price increases. The Master Plan projects existing
potable demands will continue to decline slightly but overall demands
increase in response to population and employment growth.
4. Water Supplies ■Existing and planned
future water supplies
■Review of District’s
water supply reliability
The District will continue to be reliant on service from SDCWA (via Pipeline 4)
for supplies to the Central and Otay Mesa areas. The North District will
continue to be supplied primarily with SDCWA water treated at the Helix
Water District’s Levy water filtration plant, with supplemental and backup
supply from Pipeline 4. This source redundancy affords excellent supply
reliability throughout the District service area.
5. Potable Water
System
Evaluation
■Review of existing
system and needed
improvements
The Master Plan identifies needed capital improvements addressing the
following categories:
a)system expansion to serve new development;
b)improved water distribution and quality;
c)replace aging infrastructure; and
d)improve system redundancy, reliability, and flexibility.
6. Recycled Water
System
Evaluation
■Review of existing
system and needed
improvements
The Master Plan identifies needed capital improvements addressing the
following categories:
a)system expansion to serve new development; and
b)improved recycled water service, pumping and distribution
7. Capital
Improvement
Program
■Summary of short-
term and long-term (to
2055) capital spending
recommendations
Near Term Capital Spending (Phase I)
Long-Term (to 2055) Capital Spending (Phases II & III)
1.5 References
Otay Water District, 2015. Water Facilities Master Plan.
Otay Water District, 2020 Urban Water Management Plan.
Otay Water District Integrated Water Resources Plan Update, June 2016
Otay Water Facilities Master Plan Update Page 2-1 2024
Chapter 2
SYSTEM CRITERIA
2.1 Overview
This chapter presents the District’s water and recycled water system planning and design criteria,
including the District’s water supply reliability goals. The District’s potable and recycled water CIP is
planned and sized based on these criteria. The criteria address system operating pressures, fire protection
(fire flow requirements), transmission and distribution pipeline sizing, pump station capacity sizing,
treated water storage capacity for operational uses, and emergency water supply and storage
requirements. Recycled water system criteria are presented in Section 2.3, Recycled Water Planning
Criteria.
2.2 Potable Water Planning Criteria
The District’s potable water system planning criteria are presented in Table 2-1. These criteria have been
reviewed and refined based on the following:
■2015 Otay Water District Facilities Master Plan
■Water Agency Standards Design Guidelines for Water and Sewer Facilities
■Review of District current supply, pumping, and storage operations
The potable water system operational procedures used for hydraulic modeling as established by the
District have remained unchanged since the 2015 WFMP.
2.2.1 System Pressures
Like most water systems, the District’s water service area is divided by elevation bands into pressure
zones, with each zone defined by its maximum hydraulic gradient, in feet of elevation. For example, in the
District’s Central service area, ground elevations increase from west to east, and likewise the pressure
zones increase from the 380 to the 1100 at the easternmost portion. Pressure zone boundaries are
designed to achieve required operating pressures and provide an adequate level of service to customers
and meet the necessary fire flow demands, while minimizing system leakage and the expense for more
substantial and extensive piping system and appurtenances. The potable water system with over 40,000
customers set up as demand nodes in the hydraulic model which has an average pressure of 116 psi.
■Minimum Pressures: The Master Plan recommends a minimum design static pressure of 65 psi,
unchanged from the previous master plan.
■Maximum Pressures: The Master Plan recommends an Acceptable Maximum static pressure for
existing developed zones of 200 psi, and a Preferred Maximum for newly developed areas of
120 psi, both unchanged from the previous master plan.
Service connections must have a pressure regulator installed to maintain a maximum service pressure of
80 psi to protect typical household plumbing. The pressure regulator must also comply with the criteria
established in the Uniform Plumbing Code (UPC). In addition, the water meter may also need to be
protected on the upstream side when pressures exceed 150 psi per the District’s requirements and Water
Agency Standards.
Chapter 2 System Criteria
2.2 Potable Water Planning Criteria
Otay Water Facilities Master Plan Update Page 2-2 2024
2.2.2 Fire Protection
Various planning fire flow requirements have been established by the fire protection agencies operating
within the District’s boundaries. Fire protection districts to the north include Spring Valley and Jamul-
Dulzura; those to the south include the cities of Chula Vista and San Diego, and the County of San Diego.
California Department of Forestry and Fire Protection (CalFire) provides service to those rural areas not a
part of a fire protection district. Fire flow requirements are generally based on the latest California Fire
Code (Fire Code) which includes needed fire flow based on building construction, floor space and/or land
use acreage and, in some instances, a combination of these parameters.
The Fire Code requires all new residential buildings to be fully equipped with a sprinkler system. For new
residential buildings located within designated High Severity Zone establishes, a minimum residential fire
flow of 2,500 gallons per minute (gpm) is required. The fire severity zones were developed partially due
to the need for higher residential fire flows at wild land urban interface areas. Fire severity zones are
presented in Figure 2-1 and generally include the more rural eastern areas of the District.
The Fire Code also includes a recommended allowance of a 50 percent reduction in needed fire flow if the
buildings are equipped with a sprinkler system. Most of the fire protection agencies operating in the
District service area allow for this reduction, with the exception of the City of Chula Vista which allows up
to a 25 percent reduction. The WFMP recommends utilizing the general plan land use fire flows shown
below in Table 2-1 for preliminary development assessments until the local fire protection agency can
provide specific direction. Based on recent water system analyses for new developments in the District,
the land use based fire flows have been found to be good planning level assumptions for pipeline sizing.
Historically, the water distribution system was analyzed on the basis of delivering the required fire flow
for a specified duration on the maximum demand day (MDD) of the year. This continues to be the
condition typically used to determine the size of most distribution mains comprising the system. The MDD
plus fire flow demand usually imposes the most critical hydraulic condition resulting in low residual
distribution system pressures and high velocities.
Fire flow quantities and durations for preliminary master planning purposes are determined based on the
type of land use served. Minimum fire flows range from 1,500 gpm for 2 hours for single-family residential
areas to a maximum of 5,000 gpm for 4 hours for hospitals, schools and resorts.
Table 2-1 Otay Water District Potable Water System Criteria
Criteria Recommended Value
Peaking Factors (Steady-state)
Minimum Day/Average Day Ratio 0.85
Maximum Day/Average Day Ratio Per WAS Figure 4-1-2, Curve 2
Peak Hour/Average Day Ratio Per WAS Figure 4-1-1, Curve 2
General Required Fire Flows
Single Family Residential 1,500 gpm - 2 hours
Single Family Residential (High Severity Zone only) 2,500 gpm - 2 hours
Chapter 2 System Criteria
2.2 Potable Water Planning Criteria
Otay Water Facilities Master Plan Update Page 2-3 2024
Table 2-1 Otay Water District Potable Water System Criteria
Criteria Recommended Value
Multi-Family Residential 2,500 gpm - 2 hours
Commercial/Business 3,500 gpm - 3 hours
Industrial 3,500 gpm - 4 hours
Schools/Hospitals/Resorts/Hotels 5,000 gpm - 4 hours
Distribution System Storage
Operating or Regulating Storage 0.30 MDD
Fire Storage (Largest Fire Flow in zone x duration)
Emergency Reserve Component 1.0 MDD
Pressures
Maximum Allowable Static (3)(4) 200 psi
Preferred Maximum (new development) (3) 120 psi
Minimum Desirable Static 65 psi
Minimum Peak Hour 40 psi
Minimum Maximum Day + Fire Flow 20 psi
Pump Station Capacity
Pumping Period 16 hours on MDD
Pumping Capacity(1) Maximum Day Demand
Redundancy One stand-by pump for largest unit
Standby Power Portable or permanent generator
Pipelines
Maximum Velocity - Peak Hour 6 fps
Maximum Desired Velocity (Maximum Day + Fire Flow) 10 fps(2)
Maximum Desired Headloss per thousand feet 10 feet
Minimum Diameter 8 inch
Hazen-Williams “C” factor (12-inch diameter or less)(5) 120
Hazen-Williams “C” factor (>12-inch diameter)(5) 130
gpm = gallons per minute; MDD = Maximum day demand; psi = pounds per square inch; fps = feet per second
(1) For closed systems, pump capacity equals peak hour demand or max day plus fire flow, whichever is greater and a pumping
unit with a capacity estimated to represent nighttime demand (30% of ADD).
(2) On a case by case basis District may allow higher velocities assuming minimum residual pressures are satisfied.
(3) Service connections must have a pressure regulator installed to maintain a maximum service pressure of 80 psi to protect
typical household plumbing
(4) In addition, the water meter may also need to be protected on the upstream side when pressures exceed 150 psi per the
District’s requirements and Water Agency Standards.
(5) Hazen-Williams “C” factor is a dimensionless value that represents the relative roughness of a pipe's interior surface.
Chapter 2 System Criteria
2.2 Potable Water Planning Criteria
Otay Water Facilities Master Plan Update Page 2-4 2024
Figure 2-1 Fire Severity Zones
Chapter 2 System Criteria
2.2 Potable Water Planning Criteria
Otay Water Facilities Master Plan Update Page 2-5 2024
2.2.3 Transmission and Distribution Pipelines
Pipeline sizing criteria aim to minimize wear on valves and scouring of interior coatings and to limit
distribution system head loss. The design criteria allow a peak hour (PH) pipeline velocity of 6 feet per
second (fps) for distribution and transmission mains. In general, transmission mains are designed to
provide for PH, while distribution piping is sized for providing MDD plus fire flow. Under MDD plus fire
flow, pipelines are sized such that maximum velocities do not exceed 10 fps while maintaining a minimum
residual dynamic pressure of 20 psi. Under PH conditions, maximum velocities of 6 fps require maintaining
a minimum residual pressure of 40 psi. In special circumstances, piping facilities may operate outside
maximum velocity ranges if minimum residual pressures are met and conditional approval is obtained
from the District.
A Hazen-Williams C-factor of 130 is to be used for pipelines larger than 12-inch diameter and 120 for
pipelines of 12-inch diameter or smaller for planning studies. The existing calibrated hydraulic model may
adjust system C-factors to achieve calibration goals. Surge pressure analyses will be required during facility
design and adequate surge protection methods or devices provided as necessary to protect distribution
system facilities from excessive pressure conditions. Appropriate pipeline pressure classes within the
influence of increased pressure during normal pumping station operations must be provided as well.
2.2.4 Pump Stations
Pump station criteria were developed to provide the District with design requirements for operational
needs. In particular, the pump sizing, redundancy requirements, and backup power needs are listed in
Table 2-1. The capacity and total dynamic head requirements for each station will depend on the area to
be served and are evaluated on a project-by-project basis.
The District’s new or upgraded potable water pump station facilities are sized to provide an installed
capacity, defined as firm capacity, equal to the cumulative MDD of all pressure zones supplied, including
higher zones, being supplied over a 16-hour period. The cumulative MDD equates to summing annual
average day demands (ADD) for all pressure zones served, then multiplying by the cumulative maximum
day peaking factor. The District operates through the course of the year based on various off-peak
pumping rates and schedule determined with SDG&E and adjusting pumping operations accordingly. The
District’s goals is during the MDD to avoid peak pumping periods which result in some of the highest
energy charges. During extended high power demand, the District coordinates with SDG&E to minimize
pumping times by utilizing storage.
PH and fire flow demands in excess of MDD are to be supplied from water stored within the operational
reservoirs within each pressure zone. Standby pumping units with capacity equal to the largest unit in a
pump station and emergency power supplies are recommended for each station.
For closed pressure systems (e.g., hydro-pneumatic pressure zones), the pumping station facilities are
sized to provide installed (firm) capacity equal to PH demand or maximum day plus fire flow, whichever
is greater. This equates to summing annual ADD for the zone served then multiplying by the PH peaking
factor or MDD plus largest fire flow. A standby pumping unit with capacity equal to the largest station unit
and emergency power supplies are recommended for each hydro-pneumatic pump station. Also, a
pumping unit with a capacity estimated to represent nighttime demand (i.e., 30 percent of annual ADD)
should be provided to prevent cycling of the larger units under repeated small demand conditions.
Chapter 2 System Criteria
2.2 Potable Water Planning Criteria
Otay Water Facilities Master Plan Update Page 2-6 2024
2.2.5 Treated Water Storage
Treated water storage needs for serving the potable water system are summarized in Table 2-2. The
District sizes and locates treated water reservoirs for each pressure zone for the total of each storage
component listed in the table. If storage cannot be provided within the zone, then storage may be located
in the next higher pressure zone that is connected via a pressure reducing station. In such a case, the
pressure reducing station must be sized to pass the MDD plus fire flow to the lower zone.
Table 2-2 Treated Water Storage Needs and District Criteria
Storage Need Description District Criteria
Operational Balances short-term variations in demand throughout the
day with a relatively constant incoming supply to the
water system and serves peak demands that exceed the
maximum-day supply capacity of the transmission
pipelines.
By Pressure Zone: 30% MDD
Fire Flow Provides the capability to serve fire flow requirements that
exceed the maximum-day supply capacity of the
transmission pipelines.
By Pressure Zone: Sized to meet largest fire
flow rate and duration required for zone
Emergency Provides treated water storage for use during an
emergency situation such as a facility outage. Also,
provides flexibility to manage pumping operation with
more favorable off-peak pumping rates with SDG&E.
By Pressure Zone: 100% MDD
District-wide: Up to 3 days ADD during a
maximum month
Total By Pressure Zone: 130% MDD + Fire Flow
District-wide: Total storage for each pressure
zone, plus up to 5 days ADD a maximum month
Providing adequate reservoir storage is critical to effective potable water system operations. Distribution
system operational storage reservoirs typically serve a particular pressure zone and provide a sufficient
volume of water to accommodate hourly fluctuations in water demand while being supplied by pumping
facilities. Operational storage allows pump stations and associated transmission mains in each pressure
zone to operate at a relatively uniform rate, equivalent to the MDD condition. When a PH demand occurs,
the flow is supplied from operational storage within the reservoirs because daily operational and fire
storage are contained within the operational storage component. Fire flow rate and volume is supplied
from the fire storage component in each reservoir. These operational reservoirs also contain an
emergency reserve volume component to allow each pressure zone in the District to weather such events
as power outages, mechanical system failures, short-term SDCWA supply interruptions, etc. In addition,
emergency reserves provide flexibility to work with SDG&E and improve power costs throughout the year.
As noted in Table 2-2, District policy is to size distribution system operational storage reservoirs in each
pressure zone based on the sum of: (a) daily operational capacity equal to 30 percent of MDD, (b)
emergency reserve capacity equal to one MDD, and (c) the maximum fire flow volume, resulting in:
Storage by Pressure Zone = Fire Volume + 1.3 MDD. District-wide storage for reliability, in particular
meeting SDCWA shutdowns, is summarized in the next section.
2.2.6 Water Supply Reliability
The District is reliant on imported water for all its supply. The District recognizes that its supply of
imported water may be subject to reductions during droughts or other shortage situations. Also, the
District recognizes that the facilities that deliver imported water into San Diego County and to the District’s
Chapter 2 System Criteria
2.3 Recycled Water Planning Criteria
Otay Water Facilities Master Plan Update Page 2-7 2024
service area are subject to scheduled maintenance shutdowns, as well as to unscheduled service outages
due to pipe failures or other emergency events.
SDCWA reserves the right to shut down its aqueduct facilities for scheduled and unscheduled
maintenance, and advises its member agencies to have the ability to operate independently of SDCWA
supplies for up to 10 continuous days anytime of the year. SDCWA schedules routine maintenance
shutdowns of its facilities during the winter months when demands are low. Many agencies target their
planning efforts to sustain a 10-wintertime-day interruption of SDCWA deliveries. Should an unscheduled
outage occur during the peak demand summer months, these agencies may need to impose water use
restrictions during the outage period.
Scheduled aqueduct shut-downs are usually to individual pipelines, such that agencies with access to
more than one aqueduct pipeline may be able to sustain a 10-day outage of one pipeline by simply
drawing on another. Also, scheduled shutdowns are typically scheduled for the winter months, when
demands are low.
In the case of the District, the critical aqueduct supply pipeline is SDCWA Pipeline 4, which supplies treated
water. Today, during an outage of Pipeline 4, the District would draw on water treated by Helix Water
District for the North District, from the City of San Diego’s Otay WTP (under the District’s agreement with
the City) for the South District, and from the District’s emergency treated water storage component. In
the future, an additional new water supply project could greatly enhance reliability.
District Supply Reliability Goal
The District’s goal is the ability to sustain a 10-day
outage of supply from Pipeline 4 at any time of the year
without a reduction in service level. The District seeks to
obtain this level of supply reliability through the
development of alternative water supplies, through
agreements with neighboring water districts, and
through treated water storage. Treated water storage is
to contribute no more than five days of the reliability
goal, with the balance coming from other sources. Over
time, the District seeks to decrease its reliability on
treated water storage and rely more on alternative
water supplies and agreements, as illustrated in the
accompanying chart.
Chapter 5, Potable Water System Evaluation, presents
summary statistics of the status of the District’s supply
reliability relative to its goals.
2.3 Recycled Water
Planning Criteria
The recycled water system planning criteria is summarized in Table 2-3 and includes overall criteria for the
recycled water system as well as storage, pump stations and pipeline facilities. The criteria used to project
recycled water demands is also included in Table 2-3. The percentage of irrigated area by land use category is
applied to the gross acreages except for the street, roadway highways, etc. where the actual landscape
irrigation area is used. Irrigation is limited to certain periods for larger users to reduce extreme peaking that
10-Day Supply Reliability
10
5
3
The District’s goal is the ability to operate independently from the SDCWA pipeline for 10 days, through a combination of treated water storage and alternative supply arrangements. The graph shows treated water storage making up between three and five days of the total reserve. Based on existing and District storage and planned storage projects, treated water storage will make up approximately three days of the reserve at buildout conditions, with the balance coming from other supply sources.
Treated Water Storage
Alternative Supplies and Agreements
Chapter 2 System Criteria
2.3 Recycled Water Planning Criteria
Otay Water Facilities Master Plan Update Page 2-8 2024
would otherwise occur with most users irrigating in the early morning and/or late evening; this helps to limit
the required size of recycled water pipes. Recycled water system operational procedures used for hydraulic
modeling as established by the District remain unchanged from the 2015 WFMP and are further detailed
there.
Table 2-3 Summary of Recycled Water Demand Planning Criteria
Criteria Recommended Value
Central Area Annual Demand (AF/ac)
Landscape Irrigation (Parks, schools, greenbelts, freeways, etc.) 2.41
Land Use Category Percent Irrigated
Parks, Golf Courses, Greenbelts 100%
Institutional (Schools, government, community purpose, etc.) 20%
Multi-Family Residential 15%
Commercial 10%
Industrial 5%
Peaking Factors(2) Value
Minimum Day/Average Day Ratio N/A
Maximum Day/Average Day Ratio 2.0
Peak Hour/Average Day Ratio 6.0
Storage Value
Operating Storage 2/3 MDD
Pressure Criteria Value
Minimum Desirable 80 psi
Maximum Static (no demand) 150 psi
Minimum Static (no demand) 65 psi
Minimum Residual Pressure (Peak Hour) 40 psi
Pumping Station Criteria Value
Pumping Period(2) 16 hours
Pumping Capacity MDD
Redundancy N/A
Standby Power N/A
Pipe Criteria Value
Maximum Velocity – Maximum Day 6 fps
Maximum Velocity – Distribution (Peak Hour) 8 fps
Maximum Velocity – Transmission (Peak Hour) 5 fps
Maximum Headloss per thousand feet 10 feet
Minimum Diameter 6 inch
Hazen-Williams “C” factor (12-inch diameter or less) (3) 120
Hazen-Williams “C” factor (>12-inch diameter) 130
(1) Peaking factors to be verified through hydraulic model water system calibration.
(2) Pumping to occur during non-peak energy hours whenever possible.
(3) Hazen-Williams “C” factor is a dimensionless value that represents the relative roughness of a pipe's interior surface.
Otay Water Facilities Master Plan Update
Page 3-1
2024
Since 2006, the effects of increased conservation, rising water rates, drought restrictions, and other factors have combined to produce a fundamental downward shift in per capita water use. The Master Plan projects future demands will continue to reflect the reduced water use and not return to their 2006 peak levels until sometime beyond 2055.
Chapter 3
WATER DEMANDS
3.1 Summary / Overview
This chapter reviews historical and current water demands and presents the Master Plan’s projected
future condition demands through 2055 for Low, Median, and High forecast scenarios. These projected
future demand conditions are used by the Master Plan to size and schedule capital improvements for the
District’s potable and recycled water systems, as described in Chapters 5 and 6 of the report. The
projected demands will also be used by the District’s Integrated Water Resources Plan (IRP) to size the
District’s water supply portfolio, and by its Urban Water Management Plan to address the planned balance
of supplies with demands.
This Water Demands chapter is organized into the following sections:
■ 3.2 Historical and Current Use
■ 3.3 Land Use and Demographic Projections
■ 3.4 Projected Potable Water Demands
■ 3.5 Projected Recycled Demands
Historical and projected future water demands considering moderate conservation are summarized in
Table 3-1 and Figure 3-1 below. The population analysis used throughout the Master Plan was based on demand
calculations. It excluded military, college and other similar institutional populations although the demands for these
institutions were included in the analyses. Residential population was estimated using the number of residential units as
the basis to get a more accurate water demand estimate. Areas within the District boundaries not currently served by
Otay but within the District’s Area of Influence were excluded from the demand population estimate. The result was a
lower demand population of 205,243 compared to the total District population estimate in Section 1.
Table 3-1 Demographic and Water Demand Forecast Summary
Calendar Year: 2019 (actual)
2030
2040
2055
Increase 2019-2055
Demographic Forecast (per SANDAG)
Population 205,243 223,011 246,144 271,531 66,288 32%
Employment 66,294 87,406 113,260 139,289 72,995 110%
Housing Units 63,008 77,799 86,266 95,851 32,843 52%
Demands (AFY) (Total Purchases) 30,143 37,149 41,853 47,220 17,077 57%
Recycled (Central SA) 3,340 3,965 4,265 4,595 1,255 38%
Potable 26,803 33,184 37,588 42,625 15,822 59%
Chapter 3 Water Demands
3.1 Summary / Overview
Otay Water Facilities Master Plan Update Page 3-2 2024
Figure 3-1 Historical and Projected District Total Water Demands 3.1.1 Planning Perspective
The projection of future water and recycled water demands is central to the Master Plan in that the
forecast determines the capacity requirements of the District’s water and recycled water distribution
systems, and determines the quantity of supplies the District will need to serve customer demands. These
factors in turn determine the make-up of the District’s Capital Improvement Program.
Water demand forecasts generally consider how projected changes in land use, population, employment,
and conservation levels will alter the water demands existing at the time of the forecast. Over the past 20
years, District water master plans have examined projections of higher population, higher employment,
and higher developed acreages, and have concluded that demands would continue to increase at nearly
commensurate rates. These projections are summarized in Table 3-2 and are based on an average day
demands assuming 50% conservation.
Table 3-2 Water Demand Forecasts from Recent District Master Plans
Master Plan Year Issued
Planning Horizon
Projected Potable Demand Projected Recycled Demand
MGD AFY MGD AFY
2002 Buildout (2030) 56.3 63,100 8.23 9,200
2008 Buildout (2030) 54.4 60,900 9.43 10,600
2008 (2013 Update) Buildout (2030) 58.6 65,600 9.43 10,600
2015 2035
Buildout (2050)
36.4
40.9
40,800
45,800
5.50
5.81
6,200
6,500
2024 Buildout (2055) 38.1 42,625 4.55 5,100
1995 2000 2005 2010 2015 2020 2025 2030 2035 2040 2045 2050 2055
Calendar Year
15,000
Projected RW Use
Projected Potable Use
Historic RW Use
Historic Potable
25,000
20,000
30,000
35,000
40,000
45,000
50,000
To
t
a
l
W
a
t
e
r
D
e
m
a
n
d
(
A
F
/
y
r
)
Chapter 3 Water Demands
3.2 Historical and Current Use
Otay Water Facilities Master Plan Update Page 3-3 2024
Extraordinary reductions in water demands have been seen since the mid 2000’s as summarized later in
this chapter.
3.2 Historical and Current Use
3.2.1 Historical Use and Recent Trends
For 50 years following its founding in 1956, total water demands in the District
service area trended upward, as lands developed, and population increased.
Potable demands peaked in 2006 at almost 42,000 acre feet.
Subsequent to 2006, potable demands have declined in response to price
increases, the use of recycled water, drought restrictions, and increased
adoption of water conservation measures. These factors have combined to
produce a fundamental downward shift in use, declining by about 30 % from
2006 to 2020. Since 2015 potable purchases have stabilized with some
fluctuation likely due to growth (increases) and precipitation levels
(decreases). This data is summarized in Table 3-3.
Recycled water use since the availability of supplies from the South Bay WRP
have fluctuated greatly,
ranging from about
4,800 AFY prior to the
economic crisis of 2008
to below 3,500 AFY,
with seasonal rainfall
playing a significant role
on the demands. The Salt Creek golf course closure in 2018 also contributed
to recent reduced demands. Table 3-4 provides a summary of the recycled
water demands.
Potable demands peaked in 2006 after which recycled water from SBWRP became available and reduced the need for supplementing the recycle water system. Additionally, demands have declined in response to price increases and increased adoption of water conservation measures.
Table 3-3
Calendar Year
Potable Purchases (AF)
2000 30,630
2001 31,170
2002 36,856
2003 35,857
2004 39,378
2005 39,932
2006 41,740
2007 39,359
2008 36,821
2009 32,895
2010 29,387
2011 30,158
2012 31,268
2013 31600
2014 33,027
2015 26,494
2016 27,289
2017 28,045
2018 29,286
2019 26,803
2020 29,567
Chapter 3 Water Demands
3.2 Historical and Current Use
Otay Water Facilities Master Plan Update Page 3-4 2024
Table 3-4 Historical Recycled Demands
Calendar Year
Potable Supplement (AF)
Recycled Water Supply (AF)
Total Recycled Water Demands (AF)
2006 3,028 1,228 4,256
2007 506 3,965 4,471
2008 126 4,726 4,852
2009 0 4,394 4,394
2010 0 3,784 3,784
2011 52 3,882 3,934
2012 72 4,127 4,199
2013 0 4,582 4,582
2014 42 4,723 4,765
2015 27 3,824 3,851
2016 0 3,888 3,888
2017 0 4,007 4,007
2018 0 3,966 3,966
2019 0 3,340 3,340
2020 770* 2,465 3,235
* - SBWRP was not able to supply recycled water for several months in 2020 due to process renovations
Chapter 3 Water Demands
3.2 Historical and Current Use
Otay Water Facilities Master Plan Update Page 3-5 2024
3.2.2 Use by Customer Class
The District accounting system has the following specific billing classifications which are grouped into four
categories of water use. For the purposes of water demand modeling, Otay WD’s billing classifications
were grouped into distinct water use sectors, which are summarized in Table 3-5.
Table 3-5 Otay WD Billing Classifications and Associated Water Use Sectors
Billing
Code
Account Type
Water Supply Type
Water Use Sector/Demand
Model Sector
r Residential • Potable
• Fire
Single Family Residential
(SFR) r1 Residential 1-inch Meter • Potable
ro Outside User Residential • Potable
m Multi-Residential • Potable
Multifamily Residential (MFR) ra Residential Attached/Individual
Meter
• Potable
c Commercial • Potable
Commercial, Institutional, and
Industrial (CII)
ci Commercial Irrigation • Potable
• Irrigation Non-potable
cr Golf Course Recycled • Irrigation Non-potable
co Outside User Other • Potable
o Otay WD Meter • Potable
p Public Agency • Potable
pi Public Agency Irrigation • Potable
• Irrigation Non-potable
a Agriculture • Potable
Other
f Fire Service • Fire
t Temporary Construction • Potable
tc Construction Permanent • Potable
• Irrigation Non-potable
ti Temporary Construction Irrigation • Potable
Chapter 3 Water Demands
3.2 Historical and Current Use
Otay Water Facilities Master Plan Update Page 3-6 2024
Figure 3-2 Annual District Potable Water Use by Use Sector
3.2.3 Use by System Area
The District’s overall water service area spans five system areas as shown in Figure 1-2. The three
northernmost areas – La Presa, Hillsdale, and Regulatory – are collectively referred to as the North District.
These areas are predominantly residential, with somewhat higher density in the La Presa area and
somewhat lower, rural residential density in the Hillsdale and Regulatory areas. The two southernmost
system areas – Central and Otay Mesa – are collectively referred to as the South District. The Central
system area is predominantly master-planned residential land uses, and the Otay Mesa system area is
predominantly commercial and industrial land uses. Water use characteristics of the different system
areas are summarized in terms of water sales in Table 3-6.
Calendar Years % Change
2006 2010 2015 2020 2006-2020
La Presa System
SFR 3,704 2,892 2,367 2,477 -33%
MFR 1,006 932 985 913 -9%
CII 1,084 933 850 904 -17%
Other 1 1 3 20 -
Total 5,794 4,758 4,206 4,314 -26%
Potable Water Customer Sales by System Area and Customer Class (AFY)
Table 3-6
Chapter 3 Water Demands
3.2 Historical and Current Use
Otay Water Facilities Master Plan Update Page 3-7 2024
Calendar Years % Change
2006 2010 2015 2020 2006-2020
Hillsdale System
SFR 3,060 2,200 1,712 1,811 -41%
MFR 239 193 193 191 -20%
CII 1,002 544 768 516 -49%
Other 17 8 6 7
Total 4,317 2,944 2,679 2,524 -42%
Regulatory System
SFR 1,426 947 770 818 -43%
MFR 31 34 35 43 39%
CII 397 238 241 288 -27%
Other 6 5 17 19
Total 1,859 1,224 1,063 1,168 -37%
Central System
SFR 12,807 10,412 8,856 9,744 -24%
MFR 2,131 2,408 3,458 3,300 55%
CII 6,703 3,546 3,677 4,356 -35%
Other 87 79 236 612
Total 21,728 16,445 16,227 18,012 -17%
Otay Mesa System
SFR 0 0 0 0 --
MFR 0 0 0 0 --
CII 2,343 1,898 1,773 2,044 -13%
Other 41 34 25 15 --
Total 2,384 1,933 1,798 2,059 -14%
Total District
SFR 20,997 16,451 13,705 14,850 -29%
MFR 3,407 3,567 4,671 4,447 31%
CII 11,529 7,159 7,309 8,108 -30%
Other 152 127 287 673 --
Total 36,085 27,304 25,972 28,078 -22%
3.2.4 Seasonal Variation / Monthly Peaking Factors
Water use in the District varies during the year due to the seasonal nature of landscape irrigation
demands. Irrigation demands are low during the winter months, and peak during the consistently dry
summer months. Demands during the springtime months exhibit the greatest year-to-year variability,
Potable Water Customer Sales by
System Area and Customer Class (AFY)
Table 3-6
Chapter 3 Water Demands
3.2 Historical and Current Use
Otay Water Facilities Master Plan Update Page 3-8 2024
corresponding with variability in springtime precipitation levels. Monthly average consumption between
2006-2020 is summarized in Figure 3-3 for potable water and Figure 3-4 for recycled water.
Figure 3-3 Monthly Average Potable Water Consumption
Figure 3-4 Monthly Average Recycled Water Consumption
Average monthly seasonal peaking factors for each major potable water use sector are presented in Table
3-7 while Table 3-8 summarizes the recycled water system seasonal peaking factors.
Chapter 3 Water Demands
3.2 Historical and Current Use
Otay Water Facilities Master Plan Update Page 3-9 2024
Table 3-7 Potable System Monthly Peaking Factors
Water Use Category
SRF MFR CII
Jan 0.80 0.96 0.71
Feb 0.76 0.96 0.67
Mar 0.71 0.88 0.65
Apr 0.77 0.90 0.70
May 0.92 0.96 0.86
Jun 1.07 1.01 1.05
Jul 1.20 1.05 1.20
Aug 1.26 1.07 1.36
Sep 1.29 1.10 1.43
Oct 1.21 1.07 1.29
Nov 1.07 1.03 1.12
Dec 0.94 1.00 0.95
Note: Average for period from 2006 through 2020
Table 3-8 Recycled System Monthly Peaking Factors
Peaking Factor
Jan 0.35
Feb 0.41
Mar 0.38
Apr 0.71
May 1.04
Jun 1.35
Jul 1.55
Aug 1.57
Sep 1.62
Oct 1.33
Nov 1.06
Dec 0.59
Note: Average for period from 2006 through 2020
Monthly peaking factors have gradually moderated during the past 30 years as the District service area
has developed and as outdoor water use as a percentage of total use has declined. As detailed later in this
chapter, the Master Plan projects this moderating trend will continue throughout the planning horizon.
3.2.5 Unaccounted-For Water (Non-Revenue Water)
In reporting water use data, the District distinguishes between water purchases, which is the volume of
water delivered into the distribution system, and water sales, which is the volume of water recorded by
customer meters and billed as sales. Not all water delivered to the system is recorded as sales, and this
difference is known as unaccounted-for water, or non-revenue water. Unaccounted-for water results
Chapter 3 Water Demands
3.2 Historical and Current Use
Otay Water Facilities Master Plan Update Page 3-10 2024
primarily from under-registering water meters and includes leaks in the distribution system and fire
hydrant uses for firefighting and main flushing.
The District conducts annual water loss auditing using AWWA’s Water Audit software tool on a fiscal year
basis. The tool summarizes non-revenue potable water based on the differences between system inputs
(i.e., purchases or production) and billed consumption. Figure 3-5 presents the results for 2017 through
2021, with the five-year average of unaccounted-for potable water in the District service area of 4.6%.
This is below industry standards and reflects a well-designed and maintained system. The District
proactively works to reduce Unaccounted for Water through a leak detection program that surveys 20%
of the distribution system each year. The investigative leak reports are reviewed on the same day. If the
leaks are confirmed to be the District’s, they are repaired promptly. Additionally, the District also has a
proactive poly service lateral replacement program where poly services are replaced with copper.
Figure 3-5 Potable System Estimated Average Annual Water Losses
Chapter 3 Water Demands
3.3 Land Use and Demographic Projections
Otay Water Facilities Master Plan Update Page 3-11 2024
3.3 Land Use and Demographic Projections
3.3.1 Land Use
Land Use Jurisdictions / Adopted Land Use
The District’s boundaries and service areas are shown in Figures 1-1 and 1-2. The District boundaries
encompass several land use jurisdictions: the eastern portion of the City of Chula Vista, a portion of the
City of San Diego on Otay Mesa, and various unincorporated areas under the jurisdiction of the County of
San Diego, including Rancho San Diego, Jamul, Spring Valley, Bonita, and eastern Otay Mesa. Development
within each of these areas is governed by the adopted general plans, community plans, and other land
use plans of the controlling jurisdiction. The land use and demographic projections utilized by the Master
Plan as the basis for water demand projections and system planning are fully consistent with the adopted
land uses specified in these plans.
Area of Influence
The District’s water service area boundaries encompass 125.5 square miles of land. An additional 11
square miles (see Figure 1-2) on the District’s eastern flank are designated by the San Diego Local Area
Formation Commission (LAFCO) (also known as Sphere of Influence, or SOI), but outside its current active
service area. Some of these lands to the east are outside the imported water service areas of SDCWA and
MWD and would require annexation into those agencies as a condition of water service.
Consistent with the LAFCO AOI designation, the Master Plan accounts for projected development within
the AOI to the extent consistent with adopted land use plans and to the extent these lands are expected
to annex into the District. These areas include the Otay Ranch Villages 13 and 14, and the San Ysidro
Mountain Ranch / Planning Area 17 area, all as shown in Figure 1-3. The AOI also includes the Sycuan
Indian Reservation, located to the northeast of the District boundary, but these lands are not included in
the demand forecast due to the apparent preference of Sycuan to annex to the Padre Dam Municipal
Water District (PDMWD) rather than to the District.
Major Development Areas and Land Plans
Major community plans, Water Supply Assessments (WSAs), and Sub Area Master Plans (SAMPs) within
Otay WD’s existing service area and AOI were reviewed to identify major developments expected to
contribute to increased demand for water. Appendix B provides an updated summary of the specific
planned development projects identified and reviewed for the WFMP. Remaining developable lands in
the District are concentrated in the Central and Otay Mesa service areas. Development in a majority of
these areas is controlled by the following adopted land use plans:
Otay Ranch General Development Plan: The Otay Ranch General Development Plan was adopted jointly
by the City of Chula Vista and the County of San Diego in 1993 to guide the development of nearly 23,000
acres east of Interstate 805 and south of Telegraph Canyon Road. The plan area comprises a majority of
the District’s Central system area. A subsequent General Plan update by the City in 2005 resulted in
modest modifications to the original plan, including provisions for the City’s proposed University site and
density transfers within some of the planned areas. The closure of Salt Creek Golf course, and subsequent
planned development, as well as rezoning of the Sunbow industrial zone into a residential zone have been
captured in the Central Area System’s land use demand projections.
Chapter 3 Water Demands
3.3 Land Use and Demographic Projections
Otay Water Facilities Master Plan Update Page 3-12 2024
■ Otay Mesa Community Plan: In 2014 the City of San Diego adopted the Otay Mesa Community
plan to guide development within the western portion of Otay Mesa. The plan modified previously
planned commercial and industrial land uses and added multi-family residential land uses to the
mix of planned development. The 2017 adoption of the plan projects approximately 4,485
additional multifamily dwelling units within Otay WD’s existing service area.
The County of San Diego General Plan and the East Otay Mesa Specific Plan: The East Otay Mesa area
in the County of San Diego has undergone a series of planning and zoning updates aimed at responding
to market trends, increasing development flexibility, and refining land use. Initially guided by the East
Otay Mesa Specific Plan (adopted in 1994), the planning for this area has continued to evolve with two
significant amendments to address changing needs.
The 2018 amendment introduced two new mixed-use designations:
o Mixed-Use Residential Emphasis: Focused on residential development, blending housing
with limited commercial or retail uses.
o Mixed-Use Employment Emphasis: Prioritized employment and industrial development with
some residential elements. This approach aims to create a balanced community with both
jobs and housing.
The 2021 update made strategic adjustments to the land use designations in the area. These changes
included:
o Increased Acreage for Heavy and Mixed Industrial Zones: Recognizing the growing demand
for industrial and logistics facilities, the amendment expanded the areas designated for
heavy industry and mixed industrial use.
o Decreased Acreage for Technology Business Park and Light Industrial Zones: A reduction in
the land set aside for technology-focused business parks and light industrial areas, reflecting
shifts in market priorities and perhaps a desire to accommodate more intensive industrial
development.
These amendments reflect an ongoing effort to balance the evolving needs of the region—especially in
terms of housing, employment, and industrial development. The adjustments from 2018 and 2021
suggest a shift towards greater industrial and mixed-use development, potentially in response to
increased demand for warehousing, logistics, and manufacturing space. Meanwhile, the mixed-use
designations aim to support both residential and commercial growth, fostering a more integrated
community. By adapting the land use framework, the County of San Diego is striving to align the specific
plan with both current and future market conditions, while also maintaining a flexible approach that can
accommodate a variety of development types in East Otay Mesa.
Additional detailed data on land use plans and individual planned development projects are presented
in Appendix B
3.3.2 Population, Housing, and Employment Projections
The Master Plan has utilized the most recent growth and demographic forecast prepared by SANDAG. This
forecast is known as Series 14 in SANDAG’s history of regional growth plans and forecasts. The Series
14 forecast is based on regional demographic and economic forecasts, and on the adopted land use
Chapter 3 Water Demands
3.3 Land Use and Demographic Projections
Otay Water Facilities Master Plan Update Page 3-13 2024
plans of the City of Chula Vista, the City of San Diego, the County of San Diego, and each of the other
land use jurisdictions within the District service area. Additional information on the forecast and
SANDAG’s forecast methodologies are available at the SANDAG website, www.SANDAG.org.
Series 14 data provide demographic projections in 5-year increments from
2016-2050, where 2016 serves as the base year estimate. Series 14
projections were obtained at “Master Geographic Reference Areas”
(MGRAs) spatial geographic unit, which is a SANDAG-defined geographical
boundary based on census blocks. The SANDAG forecast indicates the District
service area will continue to grow throughout the forecast horizon, with
population projected to increase over 30 percent by 2055, and employment
more than doubling over the same period. Table 3-9 present the District-wide
population forecast from SANDAG.Table 3-9 Historical and Projected
Population for the Service Area
Year Population
2016 204,984
2018 205,427
2020 205,243
2025 213,965
2030 223,011
2035 234,381
2040 246,144
2045 258,937
2050 265,234
2055 271,531
Figure 3-6 defines the location of the obtained MGRAs relative to the District’s service area. To support
water demand forecasting, the MGRA-level projections were geo-processed to the pressure zone
Chapter 3 Water Demands
3.3 Land Use and Demographic Projections
Otay Water Facilities Master Plan Update Page 3-14 2024
boundaries as shown in Figure 3-7. The approach for geoprocessing the SANDAG MGRA data is described
below in Section 3.3.3.
Figure 3-6 Location of Obtained MGRAs Relative to District Service Area Boundaries
Chapter 3 Water Demands
3.3 Land Use and Demographic Projections
Otay Water Facilities Master Plan Update Page 3-15 2024
Figure 3-7 District Potable Pressure Zones
Chapter 3 Water Demands
3.3 Land Use and Demographic Projections
Otay Water Facilities Master Plan Update Page 3-16 2024
3.3.3 Approach for Geo-Processing SANDAG Data
Geoprocessing was performed using GIS overlays of SANDAG MGRAs and the District’s pressure zones and
service area boundaries. Figure 3-8 illustrates how MGRA boundaries were aggregated to District pressure
zone boundaries. The two large bold boundaries represent two pressure zones and the six numbered
areas with dashed boarders represent MGRA’s. An area-weighting routine was applied. Note that for
MGRA 5, about 50% of it lies within Pressure Zone A and the remaining half is in Pressure Zone B. In this
instance, the demographic projections (e.g., population, housing units) associated with each MGRA were
multiplied by the area ratio (i.e., 50%) and allocated into Pressure Zones A and B.
Figure 3-8 Example of MGRA Boundaries within District Pressure Zone/Service Area
3.3.4 Summary of Processed Demographic Projections
In addition to geo-processing, SANDAG Series 14 projections were aggregated for consistency with the
major water use sectors defined in Table 3-10. Data suggests that MFR will become a larger share of the
overall residential sector by 2055. Projected job growth is illustrated in Figure 3-9.
Table 3-10 Key SANDAG Demographic Variables by Water Use
Associated Water Use SANDAG Variable
Single Family Residential Housing Units (SFR) Single Family Attached Households
Single Family Detached Households
Multi-Family Residential Housing Units (MFR) Multifamily Households
Mobile Home Households
Commercial Industrial Institutional Jobs (CII) Total Jobs
Chapter 3 Water Demands
3.4 Projected Potable Water Demands
Otay Water Facilities Master Plan Update Page 3-17 2024
Figure 3-9 Projected Commercial, Industrial and Institutional (CII) Job Growth
3.4 Projected Potable Water Demands
3.4.1 Approach / Methodology
The Master Plan forecasts future water demands using a
modified forecast factor approach, incorporating existing
demands for each major water use sector as a base, and
scaling these based on SANDAG projected demographic
“driver units” and explanatory variables. Driver units reflect
the size or scale of a water use sector and allow for
differentiation of rate of use from total consumption. The
forecast methodology is outlined below.
a)Existing baseline unit demands. The Master Plan
uses actual unit use factors for calendar year 2019 as
the baseline normal condition demands for the
forecast period.
b)Projected driver units. New development demands
are generated using the baseline unit use factors,
and the SANDAG Series 14 projections for the District
at the pressure zone level of spatial resolution.
c)Explanatory variables. The Master Plan projects unit
use rates will continue to decline over time in
response to increased water rates, conservation
education, and shifting landscape preferences.
3.4.1.1 Mathematical Definition
Forecast Methodology Summary
x
x
=
Demand forecast components. The forecast methodology starts with existing baseline demands, and adjusts for growth from new development, and for changes in per account usage due to conservation efficiencies and other effects.
FORECASTED DEMANDS
c)Explanatory Variables
b)Projected Driver Units
a)Existing Baseline Demands
Chapter 3 Water Demands
3.4 Projected Potable Water Demands
Otay Water Facilities Master Plan Update
Page 3-18 2024
A modified forecast factor approach was implemented to project Otay WD’s future water demands. The
modified forecast factor approach uses the future projected value of demographic and other explanatory
variables to scale baseline water use. It is represented using the following Equation (1), where the
variables are defined in Table 3-11. The general equation is applied to produce unique demand projections
for each pressure zone and water use sector (i.e., SFR, MFR, CII). 𝑄𝑄=(𝑁𝑁 ∗ 𝑞𝑞)∗ ∏�𝑋𝑋𝑓𝑓𝑓𝑓𝑓𝑓𝑓𝑓𝑓𝑓𝑓𝑓𝑋𝑋𝑏𝑏𝑏𝑏𝑏𝑏𝑓𝑓�𝛽𝛽𝑥𝑥(1)
Table 3-11 Modified Forecast Factor Variable Definitions
Variable Definition
Q Volumetric demand for a given water use sector (e.g., SFR, MFR, or CII)
and geography (e.g., pressure zone)
N Number of driver units for a given water use sector 𝑞𝑞 Baseline year per-unit water demand for a given water use sector 𝑥𝑥future Projected value of an explanatory variable 𝑥𝑥base Baseline year value of an explanatory variable 𝛽𝛽𝑥𝑥 Fitted statistical coefficient (i.e., parameter) of the explanatory variable
3.4.1.2 Baseline Per-Unit Demands
Baseline per-unit demands were developed by selecting a base year and dividing the observed sectoral
water use by the estimated number of driver units during the base year. Baseline monthly per-unit
demands were developed for each major water use sector unique to each pressure zone within the
District’s service area. The base year for water consumption was selected to be 2019, given the relatively
“normal” weather conditions1 and the overall economy was not yet affected by the COVID-19 pandemic.
SFR, MFR and CII baseline per-unit demands were developed by dividing the base year demand by the
number of SANDAG estimated 2019 SFR households, MFR households or CII jobs. Per-unit demands were
calculated uniquely for each sector and pressure zone. Service area average baseline per-unit demands
are plotted in Figure 3-10 with tabular summary by pressure zone presented in Appendix C.
1 2019 was not a drought year and was several years removed from the 2012-2016 drought.
Chapter 3 Water Demands
3.4 Projected Potable Water Demands
Otay Water Facilities Master Plan Update Page 3-19 2024
Figure 3-10a SFR and MFR Baseline Per-Unit Demands
Figure 3-10b CII Baseline Per-Unit Demands
Chapter 3 Water Demands
3.4 Projected Potable Water Demands
Otay Water Facilities Master Plan Update Page 3-20 2024
3.4.1.3 Projected Driver Units
Driver units were derived from the SANDAG demographic projections reviewed previously in Section 3.3.
Single family residential and multi-family residential usage is scaled upwards proportionate to housing
unit counts for each category and adjusted for projected changes in persons per household rates.
Commercial, industrial, and governmental usage is scaled upwards from existing use proportionate to
employment projections.
3.4.1.4 Explanatory Variables
Water demands are responsive to several external variables that vary over time. San Diego County Water
Authority (SDCWA) completed an update to their econometric water demand model (SCDWA, 2021) that
estimated the effect of several socioeconomic/demographic variables on water demand throughout the
County. Several fitted parameters from the SDCWA model were used to adjust the District’s baseline
projected water demands for future adjustments and are summarized in Table 3-12.
Table 3-12 Summary of Explanatory Variables and Model Parameters
Model Parameter Description
Coefficient Estimates by Sector
SRF MFR CII
Persons per
household
SANDAG projected population divided
by number of projected households 0.59 0.34
Housing density SANDAG projected households divided by
the SANGIS planned SFR and MFR acreage -0.14 -0.11
Price of water Expected price of water -0.23 -0.12 -0.19
Median Household
Income
Median household income 0.48 0.48
Temperature1 Departure from long-term average maximum
daily temperature in the service area
0.47 to 0.59 -0.18 to 0.06 1.22 to 1.39
Precipitation2 Departure from long-term average monthly
total precipitation in the service area
-0.05 to -
0.02
-0.01 -0.03 to -0.01
1. Temperature and precipitation coefficient estimates are provided as a range because the SDCWA model
included concurrent month and up to 3-month lagged weather conditions as explanatory variables.
2. The SDCWA model developed unique temperature and precipitation parameters for each member agency, including OWD.
These factors are further discussed in Table 3-13.
Chapter 3 Water Demands
3.4 Projected Potable Water Demands
Otay Water Facilities Master Plan Update
Page 3-21 2024
Table 3-13 Additional Discussion of Future Water Use Changes
Factors Driving Unit Use Reductions
Landscape Ordinances As required by State law, all land use jurisdictions have adopted landscape ordinances limiting
new landscape construction water use to 70% evapotranspiration (ET), and limiting turf
utilization in commercial, industrial, and streetscape uses.
Weather-Based Irrigation
Controllers
Newer landscape irrigation controllers can automatically adjust irrigation schedules consistent
with actual climate conditions and plant water needs, reducing unnecessary use due to over-
irrigation. The use of these controllers will become increasingly more common during the
planning horizon.
Turf Retirement MWD and SDCWA are providing financial incentives to customers who replace grass with low
water use landscapes, and customer landscape preferences are shifting away from turf.
High-efficiency clothes
washers
Newer clothes washing machines, in particular front-loading versions, are more water efficient
than older traditional-style washers.
High-efficiency toilets California regulations enacted in 2011 require new toilets to operate with a maximum of 1.28
gallons per flush, compared to 1.6 gallons per foot per the previous requirements. This will reduce water use at new SFR and MFR construction.
MFR Submetering Future MFR construction will be subject to requirements that individual units be sub metered
and billed by usage. The direct price signal to the consumer results in reduced water use.
Increasing Real Prices /
Behavioral Changes
Retail water rates may continue to increase at a rate faster than inflation, driven by increases
in wholesale rates. Customers respond by reducing use.
Factors Driving Unit Use Increases
Growth located in warmer inland areas New development in the District is moving further and further inland. The warmer climate of inland areas results in increased unit irrigation demands.
The average ETo rate for the geographic center of the District is approximately 47 inches (per CIMIS station data, see SD County Landscape Design Manual, Ap. A). The average ETo at the
eastern edge of the District at Lower Otay Reservoir is 50 inches, 6% higher than the
geographic center.
Climate Change Per SDCWA’s WFMP climate change analysis, the median predicted climate change will
increase average ETo in the District service area 1.9% by 2035, and approximately 3% by 2050.
3.4.1.5 Approach to Calculating Other Demands
Some relatively low volume water use categories do not fit neatly into SFR, MFR, or CII sectors such
as “Fire Service”, and “Temporary Construction”.2 To account for these “other” water uses, a relative
ratio of other uses to total use was used. The ratio was assumed to be constant into the future based on
the historical average from 2006 to 2020. The percentage of other water use was calculated individually
for each pressure zone. Table 3-14 shows the percentage of other water use for each pressure zone.
2 Agricultural irrigation is also relatively low volume (less than 1% of total water use in 2019), therefore it was incorporated into the “other” demand sector.
Chapter 3 Water Demands
3.4 Projected Potable Water Demands
Otay Water Facilities Master Plan Update
Page 3-22 2024
Table 3-14 Percent Other Demands by Pressure Zone
Pressure Zone % Other Pressure Zone % Other Pressure Zone % Other Pressure Zone % Other
380 0.0% 640 0.2% 870 0.8% 1090 7.9%
458 0.5% 657 0.1% 932 23.0% 1100 0.5%
485 0.0% 711 3.0% 944 0.0% 1200 0.1%
493 0.0% 803 0.2% 978 0.4% 1296 6.2%
520 0.0% 832 0.0% 980 0.5% 1485 0.1%
580 0.2% 850 0.3% 1004 0.1% 1530 1.0%
624 2.1% 860 4.8% 1050 9.2% 1655 0.2%
3.4.1.6 Approach to Calculating Unaccounted-for Water
Unaccounted-for water includes any water that is lost from supply to consumption. Projected
unaccounted-for water is estimated by multiplying the total forecasted demand across all sectors by the
recent 5-year average (2017-2021) of AWWA water loss. Historical unaccounted for water is documented
in Section 3.2.5 and is assumed to be 4.6% of demand for the potable water system.
3.4.1.7 Approach to Accounting for Future Conservation
Historical conservation achieved prior to 2020 is implicit in the per unit demands defined in Appendix C.
Expected future conservation is explicitly accounted for as an additional line item based on Otay WD’s
2020 UWMP conservation estimates. The conservation estimates are additive to any conservation that
has already occurred in the district over the past decade. Table 3-15 shows the conservation projections
from 2025 to 2055. Conservation was allocated to each pressure zone based on percent of overall
demand.
Table 3-15 Conservation per year from District UWMP
Year Conservation (Acre-Feet / Year)
2025 4,488
2030 4,543
2035 5,040
2040 5,040
2045 5,034
2050 5,034
2055 5,034
Chapter 3 Water Demands
3.4 Projected Potable Water Demands
Otay Water Facilities Master Plan Update
Page 3-23 2024
3.4.2 Projected Potable Demands
Water demands in the District service area will increase over time relative to existing demands, but at a
slower rate than the underlying growth in population and employment. The Master Plan projects future
demands will be even lower than those forecasted in the District’s previous master plan, and that potable
demands will not again reach their 2006 peak levels until sometime beyond 2050.
The modified forecast factor methodology described above was applied to produce a baseline water
demand forecast based on data sources and variable assumptions as indicated in Table 3-16.
Table 3-16 Summary of Baseline Scenario Data Sources and Assumptions
Model Input Source Assumptions
Driver units (i.e.,
housing units, jobs)
SANDAG Series 14,
Major developments
from community plan
data
•Geo-processed to District pressure zone boundaries and
expected development areas within District service area
•Driver units within District AOI based on future planned
developments expected to be served by Otay WD
•Expected new developments cross-referenced/confirmed with
SANDAG projections
Baseline per-unit demands District customer meter data Baseline per-unit demands as defined in Appendix C
Persons per household SANDAG Series 14 Geo-processed to District pressure zone boundaries as defined in Appendix D
Housing density SANDAG Series 14, SANGIS planned land use SANDAG projected households divided by the SANGIS planned SFR and MFR acreage as defined in Appendix D
Median Household Income SANDAG Series 14 Converted to constant dollars
Real Price of water N/A Assumed constant in real terms
Monthly maximum temperature and Total Precipitation SDCWA Assumed historical normal (1981-2018) temperature and precipitation
Other water use District customer meter
data Historical (2006-2020) average of 1.4%
Unaccounted-for water District estimated losses 4.6%
A forecast envelope was developed by considering three conservation scenarios: no conservation,
moderate (median) conservation, and full conservation. The median conservation scenario assumes 50%
of the conservation projection is met. The conservation projection is from the District’s 2020 UWMP.
Historical and projected median future water demands are summarized in Table 3-17, Figure 3-11, and
Table 3-18 below. Table 3-17 summarizes the median potable forecast by overall District demographics
and demands while Table 3-18 provides the information based on pressure zones and regional districts.
Note that the variability of the geo-processing for some of the smaller pressure zones results in some
relatively minor differences in historic and projected demands but show as a high percentage. These do
not have an impact on the overall system evaluation.
Chapter 3 Water Demands
3.4 Projected Potable Water Demands
Otay Water Facilities Master Plan Update
Page 3-24 2024
Table 3-17 Demographic and Water Demand Forecast Summary
Calendar Year: 2020 (actual) 2030 2040 2055 Increase 2020-2055
Demographic Forecast
Population 205,243 223,011 246,144 271,531 66,288 32%
Employment 66,000 88,000 112,000 140,000 74,000 112%
Housing Units 69,000 76,000 84,000 95,000 26,000 38%
Potable Demands
(Total Purchases)(Ac-Ft/Yr)
29,567 31,128 37,588 42,625 13,058 44%
Single Family Residential 14,850 16,138 18,312 19,006 4,156 28%
Multi-family Residential 4,447 5,769 6,744 8,595 4,148 93%
Public/Commercial 8,108 9,531 12,726 14,906 6,798 84%
Other 673 398 481 559 -114 -17%
Unaccounted 1,489 1,535 1,845 2,077 Conservation* - 2,244 2,520 2,517
*Conservation based on Median forecast
Figure 3-11 Projected Potable Water Demands
Note: The District has elected to use the MEDIAN forecast (50% Conservation) for Master Planning and
Capital Improvements and will use the LOW forecast (100% Conservation) for supply planning. Table 3-15
identifies higher annual conservation as the 100% conservation forecast is used in the UWMP.
Chapter 3 Water Demands
3.4 Projected Potable Water Demands
Otay Water Facilities Master Plan Update
Page 3-25 2024
Table 3-18 Median Potable Forecast by Pressure Zone, System Area and District (AFY)
% Change vs. 2019
Actual 2019 2030 2040 2055 2030 2040 2055
La Presa System
Total 4,368 4,494 4,617 4,780 3% 6% 9%
Hillsdale System
Total 2,475 2,647 2,694 2,817 7% 9% 14%
Regulatory System
Total 1,166 1,263 1,275 1,314 8% 9% 13%
North District Total 8,009 8,405 8,585 8,911 5% 7% 11%
Central System
Total 16,587 19,866 22,556 26,326 20% 36% 59%
Otay Mesa System
Total 2,285 4,913 6,447 7,388 115% 182% 223%
South District Total 18,872 24,778 29,003 33,714 31% 54% 79%
Total District 26,881 33,184 37,588 42,625 23% 40% 59%
Reviewing the forecast data, the Master Plan projects water demands in the North District areas will
remain relatively flat throughout the forecast period. Most of the demand growth projected for the
District as a whole will occur in the South District, as these areas develop consistent with adopted land
use plans.
Upon careful review, the District has elected to use the Median forecast as the planning basis for the
Master Plan and its related Capital Improvement Plan, exclusive of supply planning. For supply planning
purposes, and in particular the consideration of a water purchase agreement for a new water supply, the
District has elected to use the Low forecast considering full conservation practices. Full conservation is
projected to be approximately 50% less than the Median forecast, per the 2015 WFMP.
3.4.3 Possible Loss of Recycled Supply
The District obtains most of its supply of recycled water from the City of San Diego’s South Bay Water
Reclamation Plant, under the terms of a purchase agreement set to expire in 2026. The District assumes
it will be able to renew or renegotiate the agreement to extend the term far into the future and not
transfer the recycled water demands to the potable water system.
Chapter 3 Water Demands
3.5 Projected Recycled Demands
Otay Water Facilities Master Plan Update
Page 3-26 2024
3.5 Projected Recycled Demands
The Master Plan has projected recycled water demands using methodologies similar to those described
previously for the potable demand forecasts. The recycled demand forecast assumes that recycled water
service will be available only in the Central system area, as reviewed in Chapter 1 for the baseline planning
assumptions.
Within the Central system area, the forecast assumes that almost all new development will utilize recycled
water for irrigation uses, with the only exceptions being those areas that are within the drainage basins
of the Sweetwater and Lower Otay Reservoirs and therefore not allowed to use recycle water. The new
developments are assumed to have demands proportional to the identified land use as presented in Table
3-19. The base irrigation rate is assumed at 2.41 acre-feet per acre of land per year as was used in the
2015 WFMP.
Table 3-19 Percent of Land Area Served by Recycled Water
Land Use Percentage of Land Area
Parks and Golf Courses 100%
Institutional 20%
Multi-Family Residential 15%
Commercial 10%
Industrial 5%
A new recycled water user outside the District’s service area, Glen Abbey Memorial Park and Mortuary
within the Sweetwater Authority service area, was identified for potential expansion and has been
assumed to be included in the forecast. The demand for the facility is estimated at 187 acre-feet per year.
The forecast also assumes those existing irrigation meters currently on the potable system will remain as
potable demands and not convert to recycled service, consistent with the District’s experience with the
high costs of retrofitting customer systems for recycled use. Consequently, the forecast does not include
potable sales through Central area irrigation meters.
As presented above in the water supply discussion, the District’s water demands have not changed greatly
since 2015. This can be attributed to several factors including the expansion of the recycled water system
mainly in the development of Villages 2, 3 and 8 being offset by the closing of Salt Creek golf course and
conservation. Projected recycled water demands are presented in Table 3-20 and Figure 3-12 below.
Table 3-20 Projected Recycled Water Demand
Baseline 2019 (actual) 2030 2040 2055 Increase 2019-2055
Projected Total MGD 3.29 3.54 3.81 4.10 38%
AFY 3,340 3,965 4,265 4,595 38%
MGD = million gallons per day, AFY = acre feet per year
Chapter 3 Water Demands
3.5 Projected Recycled Demands
Otay Water Facilities Master Plan Update
Page 3-27 2024
Figure 3-12 Projected Recycled Water Demands
The availability of recycled water from the District’s main source, the South Bay Water Reclamation
Plant (SBWRP) has averaged less than the take or pay agreement that the City and the District have in
place for 6 MGD (6,720 AFY).
2060 2050 2040 2030
Calendar Year
2020 2010
2,500
2000
2015 WFMP Projection 3,000
Projected Demands
3,500 Historic Demands
7,000
6,500
6,000
5,500
5,000
4,500
4,000
Re
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e
d
W
a
t
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D
e
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(
A
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Otay Water Facilities Master Plan Update Page 4-1 2024
Chapter 4
WATER SUPPLY
4.1 Overview
The District’s historical dependence on
imported water from MWD and SDCWA as
the main source of supply has made it
challenging to meet water demands reliably
and cost-effectively over time, especially in
protracted dry-weather periods. As a part of
its far-sighted efforts to provide water
supply reliability and rate stability for its
existing and future customers, the District completed an Integrated Water Resources Plan (IRP) in 2007
and a 2015 update which examined potential future supply options and their performance with regard to
long-term, comprehensive water resource objectives. The IRP identifies potential alternative supply
resources to meet the District’s water supply objectives, while allowing flexibility in adapting to
anticipated changes in the water industry, market and regulatory conditions.
This chapter of the Water Facilities Master Plan describes the District’s present portfolio of potable water
supply sources, and its adopted strategies now being implemented to further diversify its sources to
enhance reliability and flexibility. Recycled water supply sources are discussed as a part of the strategy to
reduce potable demands and the associated supply and to maximize the District’s unique opportunity
with Developer-driven expansions of its existing recycled water system. Water supply reliability is
discussed in Chapter 5 as a part of the Storage and Pumping Analysis/Service Reliability.
This Water Supply chapter is organized into the following sections:
■4.2 Current Regional Water Supply and Drought Conditions
■4.3 Current Portfolio of Potable Water Sources
■4.4 Possible Future Supplies
■4.5 References
4.2 Current Regional Water Supply and Drought
Conditions
This section discusses the condition of the two main supplies of water for MWD and SDCWA, the
wholesalers who currently supply the District and the effect on firm supplies and the District’s abilities to
contract for new water supplies. We start with the overall condition of the California State Water Project
(SWP) and the Colorado River, the supplies, demands, and regulatory processes underway, and then move
The District will continue to rely on supplies from SDCWA (including Helix) and the City of San Diego’s Otay Water Treatment Plant.
The master plan assumes the District will renew its recycled water purchase agreement with the City of San Diego, providing a continued supply of recycled water to the expanding District’s Central Service Area.
Chapter 4 Water Supply
4.2 Current Regional Water Supply and Drought Conditions
Otay Water Facilities Master Plan Update Page 4-2 2024
MWD obtains its water supplies from two sources. One is the Colorado River via the Colorado River Aqueduct, which MWD owns and operates, and is shown in black toward the bottom of the map. The other is the State Water Project, owned and operated by the California Department of Water Resources, and to which MWD holds the largest contract for supply.
on to discuss the current drought and the Colorado River shortage level. This section provides background
and a perspective for the District’s selection of the mix of supplies in the future portfolio.
4.2.1 Imported Supplies
Currently the District obtains 100 percent of its potable water supply from the SDCWA, of which it is one
of 24 member agencies. The SDCWA in turn obtains most of its water through facilities owned by the
MWD, which in turn obtains its water from northern California via the SWP, and from the Colorado River
via the Colorado River Aqueduct (CRA).
Metropolitan Water District of Southern California
MWD was formed in 1928 to develop, store, and provide wholesale distribution of supplemental water in
southern California for domestic and municipal purposes. MWD is a consortium of 26 cities and water
agencies, including the SDCWA. It obtains supplies from the Colorado River via the CRA, which it owns and
operates, and from northern California via the SWP. MWD’s main sources of supply are shown in
Figure 4-1.
MWD’s plans for providing supply reliability to its member agencies are summarized in its 2015 IRP and
its 2015 Regional Urban Water Management Plan (RUWMP). MWD’s supply reliability goal, as embodied
in both these plans, is to provide, in coordination with its member agencies, a mix of imported and local
supplies and conservation programs that will provide 100 percent reliability for all full-service demand
customers in its service area.
The IRP and RUWMP include a planning buffer to mitigate against planning uncertainties, such as the risk
that planned local supply projects may not all be implemented as forecast, or that future demands will be
higher than forecast. The planning buffer identifies an additional increment of water that could be
developed if needed. The planning buffer is intended to ensure that the southern California region,
including the SDCWA and its member agencies, will have adequate water supplies to meet future
demands.
San Diego County Water Authority
The SDCWA is one of 26 member agencies of MWD. The SDCWA is MWD’s largest member agency in
terms of purchases, having purchased approximately 15 percent of all the water MWD delivered in FY
2020. The SDCWA delivers treated and raw water into San Diego
County through five large diameter pipelines, located in two
principal corridors known as the First and Second San Diego
Aqueducts. These are shown in Figure 4-2.
The SDCWA was formed in 1944 by the California Legislature to
provide a supplemental supply of water as the San Diego
region’s civilian and military populations expanded to meet
wartime activity needs. The SDCWA has 22 member agencies.
SDCWA also collaborates with its member agencies to develop
local supplies such as groundwater and recycled water. The next big local supply will come from water
purification projects that are under development across the region. In 2020, about two-thirds of the
region’s water supplies are from the Colorado River, about 20 percent is from local sources and the rest
Chapter 4 Water Supply
4.2 Current Regional Water Supply and Drought Conditions
Otay Water Facilities Master Plan Update Page 4-3 2024
is from the Northern California. Regardless of the source, all the water delivered to homes and businesses
across the region meets strict state and federal quality standards.
The SDCWA 2020 Urban Water Management Plan (UWMP) provides for a comprehensive planning
analysis at a regional level and includes water use associated with accelerated forecasted development
as part of its municipal and industrial sector demand projections. As documented in the Water Authority’s
2020 UWMP, the Water Authority is planning to meet future and existing demands which include the
demand increment associated with accelerated forecasted growth. The Water Authority will assist its
member agencies in tracking the environmental documents provided by the agencies that include water
supply assessments and verifications reports that utilize the accelerated forecasted growth demand
increment to demonstrate supplies for the development are available to meet growth demands.
Chapter 4 Water Supply
4.2 Current Regional Water Supply and Drought Conditions
Otay Water Facilities Master Plan Update Page 4-4 2024
Figure 4-1 MWD Sources of Supply
Chapter 4 Water Supply
4.2 Current Regional Water Supply and Drought Conditions
Otay Water Facilities Master Plan Update Page 4-5 2024
The exhibit shows the SDCWA system as it enters San Diego County. The District receives treated water from
the Second Aqueduct Pipeline 4 which extends south to Lower Otay Reservoir.
Figure 4-2 Delivering Water to the District
Chapter 4 Water Supply
4.2 Current Regional Water Supply and Drought Conditions
Otay Water Facilities Master Plan Update Page 4-6 2024
To reduce its dependency on MWD and diversify its supplies, the SDCWA in recent years has undertaken
several initiatives, including the following:
■ Carlsbad Seawater Desalination Water Purchase Agreement: To further help diversify regional
supplies, the SDCWA has entered into a Water Purchase Agreement under which it agrees to
purchase up to 56,000 acre feet per year (AFY) of desalinated water from Poseidon Resources,
Inc. The plant became operational in 2015.
■ Imperial Irrigation District Transfer: The SDCWA signed a Water Conservation and Transfer
Agreement with Imperial Irrigation District (IID) in 1998. Through the transfer agreement, the
SDCWA is purchasing water from IID at volumes that will gradually increase year-to-year, reaching
200,000 AFY in 2021. The water is physically delivered to San Diego via MWD’s Colorado River
Aqueduct.
■ All-American and Coachella Canal Lining Conserved Water: In 2003, as part of the execution of
the Quantification Settlement Agreement on the Colorado River, the SDCWA was assigned rights
to 77,700 AFY of conserved water from projects to line the All-American and Coachella Canals.
These projects are now complete and the SDCWA is receiving this water. As with the IID transfer
water, the water is physically delivered to San Diego via MWD’s Colorado River Aqueduct.
■ Water Transfer and Banking Programs: In addition to the above, the SDCWA has entered into
water transfer and water banking arrangements with Central Valley area agricultural agencies and
groundwater storage interests. These projects are designed to make additional water available to
the SDCWA during dry-year supply shortages from MWD.
4.2.2 State Water Project – Background and Status of
Regulatory Processes
It is estimated that over 90% of Californians get some or all of their water supply from the Sierra Nevada
Mountains and watershed. The SWP and the Federal Central Valley Project (CVP) are the two largest
projects that capture this supply, and their source is the Sacramento/San Joaquin River Delta. Every year,
the California Department of Water Resources considers hydrologic conditions; precipitation, snowpack,
runoff, reservoir storage levels, and other factors, and allocates water to the SWP contractors who include
MWD. Increasingly over the past decade, the pumping of water from the Delta has been restricted
because of endangered species concerns including the protection of the Delta Smelt and Salmonids.
In response, in 2006, a federal/state collaborative process known as the Bay Delta Conservation Plan
(BDCP) was initiated with co-equal goals of water supply reliability and ecosystem restoration. BDCP was
a comprehensive conservation strategy aimed at protecting dozens of species of fish and wildlife while
permitting the reliable operation of the SWP and CVP. In 2015, the Department of Water Resources
changed its permitting approach and split the BDCP into two separate projects, California WaterFix, for
water supply reliability and California EcoRestore for ecosystem restoration. California WaterFix included
three new intakes on the Sacramento River and two 30-mile tunnels that transfer water to the south side
of the Delta improving water supply reliability and quality. The restoration and protection of over 30,000
acres of Delta habitat was planned under California EcoRestore to support the long-term health of native
fish and wildlife species. In 2019, the Water Fix was revised and renamed to the Delta Conveyance Project
Chapter 4 Water Supply
4.2 Current Regional Water Supply and Drought Conditions
Otay Water Facilities Master Plan Update Page 4-7 2024
that reduced the scope of work to one tunnel for transferring water. Figure 4-3 shows information on the
project.
Figure 4-3 Delta Conveyance Project
Chapter 4 Water Supply
4.2 Current Regional Water Supply and Drought Conditions
Otay Water Facilities Master Plan Update Page 4-8 2024
4.2.3 Colorado River – Background and Status of
Regulatory Processes
MWD has a stated goal of operating a full CRA and delivering approximately 1 million AFY to its service
area. MWD has accomplished this by supplementing its basic apportionment of 550,000 AFY with a wide
variety of water supply development projects, operational changes, transfers and exchanges, and banking
of surplus supplies in Lake Mead, in a program known as Intentionally Created Storage.
The Colorado River is in a prolonged drought with Lake Mead levels the lowest experienced since the lake
was originally filled. The U.S. Bureau of Reclamation (who operates the Colorado River) adopted in 2019
the Upper Basin and Lower Basin Drought Contingency Plans to deal with the declining water levels in
Lake Powell and Lake Mead. In May 2023 a deal between Arizona, Nevada and California was reached to
reduce water withdrawals from the Colorado River by over a third in exchange for federal funding to
compensate those impacted by the cuts. The agreement also restricts MWD’s ability to access their
storage in Lake Mead and runs through 2026.
4.2.4 California Water Supply
Extended drought conditions in the northern California and Colorado River watersheds, with the
exception of 2023 winter storm events, has the District concerned about its imported water supplies.
Scientists predict for the Western U.S. that climate change will (1) reduce the snowpack and accelerate
melting and runoff, and (2) produce more frequent and prolonged droughts.
While individual retail water purveyors cannot be expected to be able to substantially alter or influence
the Southern California water picture, it is becoming increasingly clear that regional water agencies are
not going to be able to assure the long-term availability of imported water supplies. Although the regional
water agencies involved in importing water to the District are intent, and in fact mandated, to devote
their resources and supplies to maintaining a reliable supply to customers within their area systems, it is
prudent that the District identify and consider opportunities to preserve potable water supplies and seek
alternative sources of water.
In the IRP, the District has evaluated all possible local water supplies including groundwater, recycled
water, and purchases from agencies that have local surface water rights. These included supplies from
out of the area like north of the Delta Transfers and Central Valley farmland fallowing or banking in
groundwater basins. Under the current conditions, these supplies are limited. If such supplies are available
in reasonable quantities and at reasonable prices, large wholesale agencies like MWD and other retail
agencies will contract for them. These types of contracts are intended to benefit the customers of the
wholesalers.
In general, water supplies from out of the area, if the District could obtain them, would have to be wheeled
through the SWP or the CRA, and the MWD and SDCWA systems, with the associated wheeling charges.
New conveyance systems to deliver supplies from out of the area have proven to be prohibitively
expensive, even on a large scale. A southern water supply from Mexico could be an exception but would
have other challenges to overcome.
Chapter 4 Water Supply
4.3 Current Portfolio of Potable Water Sources
Otay Water Facilities Master Plan Update Page 4-9 2024
4.3 Current Portfolio of Potable Water Sources
Existing potable water supply sources for the District include SDCWA, Helix Water District (via a supply
agreement with the SDCWA), and the City of San Diego. The facilities associated with delivering water to
the District from these agencies are described below.
4.3.1 San Diego County Water Authority
The District receives potable water from the SDCWA Pipeline 4 of the Second San Diego County Aqueduct
(Second SD Aqueduct) and the District’s 36-inch Jamacha Pipeline. These facilities are shown schematically
in Figure 4-4.
Pipeline 4 delivers potable water from a number of treatment sources, including: the SDCWA Twin Oaks
Valley WTP in north San Diego County; the MWD Skinner WTP located in Riverside County; and the
Carlsbad Desalinated Water Plant, which became operational in 2015. Throughout the year, the District
may see varying percentages of water from each source. Pipeline 4 is the District’s primary supply system.
SDCWA has multiple flow control facilities (FCFs) or connections to Pipeline 4 that feed into the District’s
water system.
The SDCWA’s First San Diego Aqueduct (First SD Aqueduct) delivers raw water to the R.M. Levy WTP,
owned and operated by the Helix Water District, and located at Lake Jennings in the community of
Lakeside. Treated potable water from this source is conveyed to the District via a flow control facility,
known as Otay 14 FCF, and the Jamacha Pipeline to the District’s Regulatory System. The SDCWA
previously provided this supply through FCF 8 and the La Mesa Sweetwater Extension (LMSE). FCF 8 has
been taken out of service and the LMSE has been disconnected at FCF 8 and downstream at the former
La Presa Pump Station site.
The SDCWA does not have contractual agreements with its member agencies to guarantee flow rates or
hydraulic gradients at their various flow control facility connections. Generally, if SDCWA cannot obtain
sufficient treated and/or raw water or has delivery limitations for the water requests of its 24 member
agencies, they will attempt to allocate the water delivery shortfall to its member agencies on a
proportional basis.
The SDCWA discourages direct service from their aqueduct system, since it reduces operational flexibility,
allows for the possibility of peaking on the system, and can potentially create hydraulic transients. SDCWA
has an Operational Surcharge Ordinance for the purpose of maximizing pipeline capacity and reducing
potential surge pressures in their pipelines. The intent of the ordinance is to encourage member agencies
to withdraw water from SDCWA pipelines at constant rates throughout the day until a revised order is
placed with operations personnel. Surcharges may be imposed for delivered flows that vary by more than
10 percent of the daily flows requested at each flow control facility. The District has several large terminal
storage reservoirs in the North District at the Regulatory site (520 and 640 reservoirs) and the South
District (624 site and 570 Roll Reservoir).
Table 4-1 lists the District’s current flow control facility connections to SDCWA Pipeline 4, their rated
capacities in cubic feet per second (cfs), and the District systems served. The location of the facilities are
shown schematically in Figure 4-4. The facilities generally have a turn-down ratio of 10:1, meaning that
the minimum non-zero flow through the facility is one-tenth, or 10 percent of the rated capacity.
Chapter 4 Water Supply
4.3 Current Portfolio of Potable Water Sources
Otay Water Facilities Master Plan Update Page 4-10 2024
Table 4-1 SDCWA Pipeline 4
Connection No. Rated Capacity Minimum Delivery
Otay Water District Water System(s) Served cfs MGD cfs MGD
10 28.0 18.10 2.8 1.81 Central Area (624-2 reservoir)
11 60.0 38.78 13.8 8.93 La Presa Back-up (640 zone)
12 60.0 38.78 6.0 3.88 Central Area (624-1 and 624-3 reservoirs)
13 40.0 25.85 4.0 2.59 Otay Mesa (571-1 reservoir) or Central Area (624-3
reservoir)
cfs = cubic feet per second; MGD = million gallons per day
The flow control facilities are further described below:
■ Otay 11 FCF. This facility is located near the southwest quadrant of SR-125 and Paradise Valley
Road, and formerly served as the primary supply for the La Presa, Regulatory, and Hillsdale
systems. With the completion of the Jamacha Pipeline and water supply purchase agreement, the
North District is normally supplied via FCF 14. FCF 11 can provide direct supply for the La Presa
System off the hydraulic gradient available from SDCWA Pipeline 4. In the event FCF 14 supply is
out of service, FCF 11 can still be used to supply the 520 and 640 Regulatory reservoirs.
■ Otay 10 FCF and Otay 12 FCF. These are the primary sources of supply to the Central Area System.
FCF 10 is located in the Eastlake area north of Otay Lakes Road near the intersection of Gotham
Street and Lehigh Avenue. Water is fed by gravity into the 624-2 reservoir. FCF 12 is located in the
Eastlake area south of Otay Lakes Road and feeds the 624-1 and 624-3 reservoirs by gravity.
■ Otay 13 FCF. This facility is located near the termination of SDCWA Pipeline 4 at the Lower Otay
Reservoir and provides supply to the Otay Mesa and Central Area System. Supply from FCF 13 was
normally conveyed by gravity to the 571-1 reservoir. It may also be used to supply north to the
Central Area via the Otay Mesa Interconnect Pipeline to the 624 reservoirs to improve water
quality where chlorine residual can be boosted at the Central Area and then conveyed back to the
571-1 Reservoir. Operationally the SDCWA may spill treated water into Lower Otay, as FCF 13
represents the last major treated water FCF on Pipeline 4.
Pipeline 4 was designed to flow either the current north to south by gravity flow, or south to north by
pumped flow, in anticipation of a possible seawater desalination facility, at one time planned in south San
Diego Bay. This south to north design would also allow, with SDCWA approval, the pumping of water from
Mexico to the north should that option become available in the future.
When SDCWA completed construction and placed Pipeline 4 into operation in 1996, the existing parallel
Pipeline 3 was converted from potable water to a raw water delivery system. Pipeline 3 provides an
imported raw water supply to the Sweetwater Authority Perdue WTP, Sweetwater Reservoir, the City of
San Diego Otay WTP, and the Lower Otay Reservoir.
Chapter 4 Water Supply
4.3 Current Portfolio of Potable Water Sources
Otay Water Facilities Master Plan Update Page 4-11 2024
Figure 4-4 Otay Water Supply Sources Schematic
Chapter 4 Water Supply
4.3 Current Portfolio of Potable Water Sources
Otay Water Facilities Master Plan Update Page 4-12 2024
4.3.2 Helix Water District
In 2006, the East County Regional Treated Water Improvement Program or ECRTWIP was created through
a series of two-party agreements between the SDCWA and four of their member agencies, including Otay
Water district, Helix Water District, Padre Dam Municipal Water district and Lakeside Water District. The
ECRTWIP included an integrated program of capital improvements and usage guarantees involving all
parties. In order for the regional benefit of the program to be developed, each party involved in the
program was responsible for portion of construction and each water purchasing agency was required to
purchase quantities of water designated in the program. Otay’s minimum purchase guarantee was at
least 10,000 acre feet of water per calendar year from SDCWA via Otay’s FCF 14, starting March 1, 2010.
The overall purpose of the program was to reduce the treated water demand from SDCWA and MWD’s
Lake Skinner Water Treatment Plant (Skinner) by maximizing the use of the R.M. Levy Water Treatment
Plant (Levy). The 106 mgd Levy Treatment Plant, owned by Helix includes 26 mgd of SDCWA capacity
rights.
On April 13, 2018, the ECRTWIP agreement was updated with the termination of the minimum demand
commitment of 10,000 acre feet and termination of Otay’s payment obligations once the SDCWA recovers
Otay’s designated capital investment responsibility.
In order to maximize flow from this source, the District’s Jamacha (36-inch) Pipeline provides a
conveyance capacity of 16 MGD. The Jamacha Pipeline project also included an upgrade at FCF 14 to 16
MGD. Through the upgrade FCF 8 has been taken out of service by SDCWA.
The District uses the Levy WTP supply as a baseload use at delivery rates of up to its 16 MGD off-peak
entitlements. The District reduced its use of the FCF 11 while maintaining full redundant capacity. Table
4-2 lists the FCF 14 rated capacity in cubic feet per second (cfs), and the District systems served.
Table 4-2 SDCWA/Helix FCF Connections
FCF Connection No.
Off Peak Capacity Peak Capacity Otay Water District Water System(s) Served cfs MGD cfs MGD
14 24.8 16.0 18.5 12.0 La Presa, Hillsdale, and Regulatory (520 and 640 reservoirs)
cfs = cubic feet per second; MGD = million gallons per day
Otay 14 FCF. This facility is located at 3rd Street and Lexington in the City of El Cajon and is the primary
source of supply to the North District via the Jamacha Pipeline. FCF 14 supplies by gravity the regulatory
reservoir sites at the terminus of the Jamacha Pipeline. Normal supply is to the 640 reservoirs (640-1 and
640-2), but can also feed the 520 reservoirs (520-2 and 520-3).
4.3.3 City of San Diego
Through a 1999 agreement with the City of San Diego, the District may obtain up to 10 MGD of supply
from the City’s Otay WTP. The Otay WTP’s existing rated capacity is 40 MGD, with an actual effective
capacity of approximately 34 MGD. The City of San Diego’s typical demand for treated water from the
Otay WTP is approximately 15 MGD. Under the terms of the agreement, the City’s obligation to supply
treated water to the District is contingent upon its surplus treatment capacity, beyond what the City needs
for its own area system.
Chapter 4 Water Supply
4.4 Possible Future Supplies
Otay Water Facilities Master Plan Update Page 4-13 2024
The agreement also provides the District with the option of funding an expansion of the Otay WTP in
return for additional capacity rights. Although in the past the City has planned for expansion of the plant
to a capacity of 60 MGD, the City currently has no committed plans or budget for expansion of the plant.
The City has commissioned an Optimization Study that is looking at the cost effectiveness of Otay WTP
supply in comparison to its other two WTPs in the City of San Diego system, which could result in
operational changes at the Otay WTP, as the smaller Otay WTP is more costly to operate compared to
Alvarado and Miramar WTPs.
The District does not currently have permanent facilities in place to take delivery of water from the Otay
WTP; instead two temporary “Lower Otay PS” diesel-trailer mounted pumps convey flows to the Otay
Mesa Interconnect Pipeline. The District has completed the design of a permanent LOPS, but has yet to
start construction of the facility because of the uncertainty of reliable and affordable water supply from
Otay WTP.
The District considers the supply of water from the Otay WTP to be an alternative source for use in the
South District area system when the SDCWA Pipeline 4 is out of service. Use of this water in the North
District would be dependent on the District completing the construction of the remaining portion of the
planned South-to-North interconnection and transmission facilities.
4.3.4 Emergency Supplies
The District has established a goal to sustain a 10-day outage of supply from SDCWA Pipeline 4 at any time
of the year without a reduction in service level. The District seeks to obtain this level of supply reliability
through the development of alternative water supplies, through agreements with neighboring water
districts, and through treated water storage. Chapter 5 includes a more detailed analysis on treated water
storage, supply reliability and the integration of a new base-loaded water supply to sustain a 10-day
outage. For emergency events longer than the 10-day aqueduct shutdowns noted previously, the District
will utilize emergency supplies developed by SDCWA’s Emergency Storage Project (ESP). The ESP is
designed to provide treated water service to all SDCWA member agencies during a two-month
interruption in service of imported water deliveries into San Diego County. The ESP is sized to deliver up
to 75 percent of each agency’s peak two-month summer demand. The key facilities of the ESP include the
Olivenhain Dam and Conveyance System, the Lake Hodges Interconnect, the San Vicente-Miramar
Pipeline, the San Vicente Pump Station, and the San Vicente Reservoir.
4.4 Possible Future Supplies
Overview and Summary
There are a number of supply and source options that the District is considering supplementing the
existing water supplies as stated in the IRP Update supply alternatives, including the Otay Mesa
Conveyance and Disinfection System Project (OMCDSP), which would convey desalinated seawater from
a connection point at the U.S./Mexico border originating from a proposed treatment plant in Rosarito
Beach, Baja California, Mexico. In general, these supplies are in early stages of development without
preliminary designs or environmental documentation. In some cases, the supply exists and all that is
needed is an agreement with the owner. If feasible, these supplies could be implemented to supplement
or replace the District’s baseline supply and potentially improve supply reliability and stabilize rates. The
District has collected a new water supply development fee as a part of its capacity fees, and this is a source
of funding for the supplies.
Chapter 4 Water Supply
4.5 References
Otay Water Facilities Master Plan Update Page 4-14 2024
Based on events over the past few years, additional hurdles exist for a number of the water supply
alternatives resulting in their exclusion from this latest WFMP CIP list. For example, the Amended and
Restated Regional Wastewater Disposal Agreement between the City of San Diego and the Participating
Agencies in the Metropolitan Sewage System has committed the City of Chula Vista, San Diego County
and the District to capital investments in the City of San Diego wastewater facilities that make considering
a reclamation plant to produce recycled water in cooperation with either agency financially unfeasible.
Regarding groundwater supply options, the water is potentially subject to Pueblo rights, greatly limiting
the feasibility of developing these sources. The potential of potable water from Rosarito or recycled water
from the U.S. International Boundary and Water Commission (IBWC) treatment plant will require federal
involvement and international agreements to transfer water from Mexico to the District. The process for
this is involved, time consuming, and subject to political factors, as well as the Rosarito project establishing
a public-private partnership and then actually being permitted and constructed.
The following water supply projects, listed in Table 4-3 below, are proposed and their status is described
in the paragraphs below.
Table 4-3 Possible Future Supplies
Description and Status Est. Yield (AFY)
City of San Diego, Otay WTP – Through a 1999 agreement the District may obtain surplus water. The District
can also fund an expansion and use the capacity. The District has a temporary pump station and has designed but not constructed a permanent station to deliver the water. Use of the capacity is pending City/ District agreement on the cost of the water.
11,200
Sweetwater Authority, Perdue WTP – The 30 MGD Perdue WTP, located adjacent to the Sweetwater
Reservoir, has excess capacity that may be available to the District, either directly with an agreement with Sweetwater Authority or through the SDCWA similar to the Helix Levy WTP arrangement. Provision for conveying the flow to the District would involve use of the existing SWA distribution system as well as new
pipelines and a pump station.
11,200
San Diego South Bay Wastewater Treatment Plant – This provides for the District to purchase recycled
water supply from the South Bay Water Reclamation Plant. 6,720
4.5 References
Metropolitan Water District of Southern California
California Department of Water Resources U.S Bureau of Reclamation
Chapter 5 Potable Water System Evaluation
Otay Water Facilities Master Plan Update Page 5-1 2024
Chapter 5
POTABLE WATER SYSTEM EVALUATION
5.1 Overview/Summary
The remainder of this chapter is organized into the following sections:
■ 5.2 Existing Water System
■ 5.3 Distribution Storage and Pumping Analysis
■ 5.4 Recommended Potable Water System Improvements
5.2 Existing Water System
5.2.1 Overview
The District’s potable water infrastructure consists of five primary operating systems, defined by
geographic location as shown in Figure 5-1, located within two larger transmission systems which
encompass the District. The five primary systems are known as La Presa, Hillsdale, Regulatory, Central
Area and Otay Mesa. The La Presa, Hillsdale and Regulatory systems reside within the North District. The
Central Area and Otay Mesa systems form the South District, with the two systems geographically
separate and normally operated independently from one another. The District does maintain an
interconnection between the Central Area and Otay Mesa for supply reliability and to improve water
quality delivered. The North and South Districts are supply independent with future plans to also be
interconnected. Each system receives imported water from one or more flow control facilities on the
SDCWA Aqueduct, as noted in Chapter 4, and has its own storage and pumping facilities to serve the
demands of customers in the system. In total, the District’s water system includes 750 miles of water
main, 30 pressure zones, 20 booster pump stations and 40 storage reservoirs accounting for 218 million
gallons (MG) of storage available within the entire District.
North District System
The North District contains three of the District’s five primary operating systems, the La Presa, Hillsdale
and Regulatory systems. The La Presa and Hillsdale systems span the western and northern boundaries of
the District and serve somewhat denser residential populations. The Regulatory system occupies the
remainder of the North District with a land area larger than the La Presa and Hillsdale systems combined
and serves the hillier and more rural portion of the District to the east. Each of these systems contains
multiple pressure zones throughout a variety of elevations. Existing infrastructure for the La Presa,
Hillsdale and Regulatory systems are shown on Exhibits I through III respectively. An updated hydraulic
schematic illustrating how all the systems are inter-related is provided on Exhibit VI.
Chapter 5 Potable Water System Evaluation
Otay Water Facilities Master Plan Update Page 5-2 2024
Figure 5-1 Existing Potable Water Systems
Chapter 5 Potable Water System Evaluation
Otay Water Facilities Master Plan Update Page 5-3 2024
South District System
The South District contains the remaining two of the District’s five primary operating systems, the Central
Area and Otay Mesa systems. The Central Area system is the largest system in the District by population
and water demand. It primarily includes eastern Chula Vista and is bounded by I-805 to the west and the
Lower Otay Reservoir to the northeast. The Otay Mesa system extends south from the Central Area system
to the southern border of the District, which is coincidental with the United States/Mexico border. The
Otay Mesa system serves a predominately industrial, distribution, warehouse, and commercial customer
base, including the Richard J. Donovan Correctional Facility and the George F. Bailey Detention Center.
The Central Area system contains multiple boosted and reduced pressure zones. Existing infrastructure
for the Central Area and Otay Mesa systems are shown on Exhibits IV and V respectively. An updated
hydraulic schematic illustrating how all of the systems are inter-related is provided on Exhibit VI.
5.2.2 System Pressure Zones
The following sections describe the individual pressure zones located in the North and South Districts. The
District contains nearly 30 different pressure zones, including primary and secondary pressure zones.
Primary pressure zones contain storage reservoirs and pumping stations and/or flow control facilities and
are typically named based on the high-water level elevation of the reservoir(s) that provides operational
storage. Secondary pressure zones, which include pressure reduced and small pumped systems, are
typically named based either on the downstream hydraulic grade elevation established by the pressure
reducing station serving the zone, or by the design hydraulic grade elevation of the hydropneumatics
pump station serving the zone. Table 5-1 lists the current pressure zones throughout the entire District,
their minimum and maximum service elevations, supply source(s) and storage reservoir(s).
Table 5-1 District Pressure Zones
Service Elevation (feet)
Storage Reservoirs Service Area Pressure Zone Minimum Maximum Supply Source
No
r
t
h
La
Pr
e
s
a
493(3) 31 343 640/493 PRS, 657/493 PRS n/a
640 178 490 FCF 14 (primary) & FCF 11 640-1, 640-2
657/640 195 507 850/657 PRS 657-1, 657-2
850 388 700 850-2 PS, & 1004/850 PRS 850-1, 850-2,
850-3, 850-4
850S 388 700 1004/850 PRS n/a
1004 542 854 1004-2 PS 1004-2
1050 (Pointe)(2) 588 900 Pointe Hydro PS n/a
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Table 5-1 District Pressure Zones
Service Elevation (feet)
Storage Reservoirs Service Area Pressure Zone Minimum Maximum Supply Source
Hi
l
l
s
d
a
l
e
803 341 653 803-1 PS 803-2, 803-3,
803-4
860
(Cottonwood)(2) 398 710 Cottonwood Hydro PS n/a
978 516 828 978-1 PS 978-1, 978-2
1200 738 1,050 1200-1 PS 1200-1
Re
g
u
l
a
t
o
r
y
520 58 370 FCF 14 (primary) & FCF 11 520-2, 520-3
832 370 682 832-1 PS, 944/832 PRS 832-1, 832-2
932(3) 470 782 1296/932 PRS n/a
944 482 794 944-1 PS, 1296/944 PRS 944-1, 944-2
1090 628 940 1090-1 PS 1090-1
1296 834 1,146 1296-1 PS 1296-1, 1296- 2, 1296-3
1485 1,023 1, 335 1485-2 PS 1485-1, 1485-2
1530 (Vista Diego)(2) 1,068 1,380 Vista Diego Hydro PS n/a
1655 (Rancho Jamul)(2) 1,193 1,505 Rancho Jamul Hydro PS n/a
So
u
t
h
Ce
n
t
r
a
l
380(3) 0 230 458/380 PRS n/a
458 0 308 624/458 PRS 458-1, 458-2
485 23 335 624/485 PRS, 711/485 PRS 485-1
580(3) 118 430 711/580 PRS n/a
624 162 474 FCF 10, FCF 12, FCF 13, 711/624
PRS
624-1, 624-2,
624-3
711 249 561 980/711 PRS & 711-1 PS 711-1, 711-2,
711-3
980 518 830 980-1 PS (stand-by) & 980-2 PS 980-1, 980-2
1100 (Rolling Hills Ranch)(2) 638 950 1100 Hydro PS n/a
Otay
Mesa
571(4) 109 421 FCF 12 & FCF 13(5) 571-1
870 408 720 870-2 PS, Low Head PS & 870-1
PS (stand-by) 870-1
FCF = flow control facility; PRS = pressure reducing station; PS = pump station; n/a = not applicable
Note: Facilities listed are as of April 2015
(1) Maximum elevation based on 65 psi static pressure. Minimum elevation based on 200 psi static pressure.
(2) Service elevations established by the hydropneumatic system pressure settings.
(3) Service elevations established by the pressure reducing station pressure settings.
(4) Reservoirs only serve as forebay storage for pump stations and provide no direct gravity service to customers.
(5) Delivered to 624-3 Reservoir first, then gravity fed to 571-1 Reservoir via Interconnect.
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La Presa System
Within the La Presa system there are currently three primary pressure zones and three small secondary
pressure zones. Two of the secondary zones are served by pressure reducing stations and one is served
by a hydropneumatics pump station.
As shown in Exhibit I, the La Presa system serves the western boundary of the North District near the
Sweetwater Reservoir. Normal supply for this system has transitioned away from FCF 11, which is now
designated as the redundant supply, to FCF 14 which discharges to the 640 Regulatory site as the primary
source of supply.
493 Pressure Zone. This is a small, closed zone between the 657 and 640 zones, south of Apple Street
and east of Pecos Street, served by pressure reducing stations from the 640 and 657/640 systems.640
Pressure Zone. Supply to the North District is via this zone from FCF 14 with redundant supply from FCF
11. The zone extends from the Regulatory site to the distribution system west of Pecos Street to the
western boundary of the District. Storage is provided by the 640-1 and 640-2 reservoirs located at the
Regulatory site.
657/640 Pressure Zone. This zone has been modified recently to normally operate at the 640 level but it
can be reverted back to 657 HGL when the North District supply is obtained from FCF 11. Located directly
south of the 850 zone and east of the 640 zone, the zone when operating at 657 HGL is served by pressure
reducing stations from the 850 zone, as well as the 657-1 and 657-2 reservoirs.
850 Pressure Zone. The 850 zone extends from Dictionary Hill in the west to Rancho San Diego in the east.
Supply for the 850 zone is via the 850-2 Copps Lane pump station at the Regulatory site, with suction from
either the 520 reservoirs or 640 reservoirs to minimize pumping head and energy costs. System storage is
provided by four reservoirs. Water is also available during emergencies to this zone via several pressure
reducing stations from the 1004 zone.
850 Simulated Pressure Zone. The extreme western portion of the 850 zone on Dictionary Hill has been
isolated from the remainder of the 850 zone due to hydraulic issues and is now a closed system fed by
pressure reducing stations from the 1004 zone.
1004 Pressure Zone. This small zone located on the upper portions of Dictionary Hill is supplied by the
1004-2 pump station drawing from the 640 zone. Storage is provided by the 1004-2 reservoir.
1050 Pressure Zone. This small closed zone serving the upper portions of the Pointe subdivision is supplied
by a hydropneumatic pump station fed from the 850 zone and is located adjacent to the 850-1 reservoir.
Locations and boundaries of the La Presa system pressure zones are shown on Exhibit I. A summary of the
existing pressure zones within the La Presa system is provided at the beginning of this section in Table 5-1.
Hillsdale System
Within the Hillsdale system there are currently three primary pressure zones and one small secondary
pressure zone that is served by a hydropneumatic system. As shown on Exhibit II, the Hillsdale system
serves the northernmost part of the North District. The Hillsdale system has also transitioned from FCF 11
to FCF 14 as its primary supply source with its suction from the 520 and 640 reservoirs.
803 Pressure Zone. This is the largest zone in the Hillsdale system, extending from along Jamacha Road to
the farthest northeast extents of the District in Dehesa Road. The 803 zone serves as the source of supply
for the other three zones in the Hillsdale area. Supply for the 803 zone is via the Hillsdale pump station
(803-1) located at the Regulatory site with normal suction from the 640 reservoirs to minimize pumping
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Otay Water Facilities Master Plan Update Page 5-6 2024
head and energy costs. Suction can also be taken from the 520 regulatory reservoirs, if needed. Storage
is provided by three reservoirs.
860 Pressure Zone. The 860 zone (Cottonwood) is a small closed zone that takes suction from the
803 system and serves its connections via a hydropneumatic pump station. The system parallels the 803
zone piping and is sized for providing domestic water use only, fire flow in the area is provided by the 803
system.
978 Pressure Zone. This zone is at the north edge of the North District and is supplied from the 978-1 PS
located adjacent to the 803-4 reservoir off of Vista Grande Road. Storage is provided by the 978-1 and
978-2 reservoirs.
1200 Pressure Zone. This zone serves the highest elevation in Hilldale between the 978 and 803 zones via
the 1200-1 PS located adjacent to the 978-1 reservoir off of Pence Drive. Storage is provided by the 1200-
1 reservoir.
Locations and boundaries of the Hillsdale system pressure zones can be seen on Exhibit II. A summary of
the existing pressure zones within the Hillsdale system is provided at the beginning of this section in
Table 5-1.
Regulatory System
Within the Regulatory system there are currently six primary pressure zones and three secondary pressure
zones, two of which are served by hydropneumatic systems and one is served by a pressure reducing
station. The Regulatory system is served in a stair-stepped arrangement involving pumping up from lower
to high zones as the zone elevations rise. As shown on Exhibit III, the Regulatory system serves lower
density development in the eastern portion of the North District.
520 Pressure Zone. This zone serves the commercial areas of Rancho San Diego along Jamacha Road and
includes the Regulatory system reservoirs, 520-2 and 520-3, which are supplied directly by FCF 14 or FCF
11. These reservoirs provide the District the ability to control water quality prior to distributing throughout
the North service areas.
832 Pressure Zone. This zone, located on the south side of Sweetwater River and primarily along Campo
Road and Steele Canyon Road, is supplied from the 520 zone via the 832-1 PS. Storage is provided by 832-
1 and 832-2 reservoirs. A connection to the 803 zone on Steele Canyon Road provides for a secondary
supply with the use of a portable pump. The 1090 and 944 zones are supplied directly from the 832 zone.
932 Pressure Zone. This closed zone is along Jamul Drive and neighbors the 803 and 1296 zone. It is
supplied by a pressure reducing station from the 1296 zone.
944 Pressure Zone. This zone between the 832 and 1296 zones along Campo Road primarily conveys water
to the Jamal area via the 944-1 pump station supplied from the 832 zone. Storage is provided by the 944-
1 and 944-2 reservoirs.
1090 Pressure Zone. This zone south of and supplied from the 832 zone via the 1090-1 pump station
and is accessed by Millar Ranch Road. Storage is provided by the 1090-1 reservoir.
1296 Pressure Zone. This zone serves the majority of the Jamul area and is supplied via the 1296-1 PS
located adjacent to the 944 reservoirs. Storage is provided by the three 1296 reservoirs located at the end
of Bear Mountain Road. The 1485, 1530 and 1655 zones are supplied directly from the 1296 zone. A
potential future connection to the Central area via Proctor Valley Road would be through this zone.
1485 Pressure Zone. This zone serves the areas north and east of Jamul and is at the eastern edge of the
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Otay Water Facilities Master Plan Update Page 5-7 2024
North District. Supply is via the 1485-1 pump station located on Lyons Valley Road with storage provided
by the two 1296 reservoirs.
1530 Pressure Zone. This small closed zone located north of the 944 reservoirs is supplied by the Vista
Diego hydropneumatic pump station fed from the 1296 zone.
1655 Pressure Zone. This small closed zone located primarily along Presilla Drive at the eastern edge of
the North District is supplied by the Rancho Jamul hydropneumatic pump station fed from the 1296 zone.
This zone is proposed to be converted to an open zone with the future addition of the 1655-1 reservoir.
Locations and boundaries of the Regulatory system pressure zones are shown on Exhibit III. A summary
of the existing pressure zones within the Regulatory system is provided at the beginning of this section in
Table 5-1.
Central Area System
Within the Central Area system in the South District there are currently three primary pressure zones and
five secondary pressure zones, the latter zones are served by either pressure reducing stations or
hydropneumatic pump station. As shown on Exhibit IV, the Central Area serves major development areas
located in eastern Chula Vista. Water supply for the Central Area system is obtained from FCF 10, FCF 12
and FCF 13 on the SDCWA Pipeline 4. Supply from the FCF 10 is conveyed by gravity to the 624-2 reservoir
and supply from the FCF 12 is conveyed by gravity to the 624-1 and 624-3 reservoirs. To maintain water
quality in the SDCWA Pipeline 4, the District also takes water from FCF 13 which is conveyed to the 624-1
and 624-3 reservoirs. Water from the 624 system supplies all of the other Central area systems by gravity
and pumping.
An emergency supply to the Central Area is also available through the District’s connection to the City of
San Diego’s Otay WTP. The District has access to 10 MGD, if available, of surplus capacity at the Otay WTP.
This source is primarily for outage conditions, as there are no permanent facilities to convey the Otay WTP
flow to the South District, only the temporary Lower Otay Pump Station (TLOPS).
380 Pressure Zone. This closed zone (previously identified as the 340 zone) is at the southwestern edge
of the Central Area system and is fed by three pressure reducing stations from the 458 zone system. The
pressure of the zone was adjusted to address low pressure areas along Energy Way.
458 Pressure Zone. This zone in the southwestern portion of the Central Area system is fed by gravity
from the 624 zone into the 458-1 and 458-2 reservoirs located south of Olympic Parkway by an altitude
valve. This supply is supplemented when needed by pressure reducing stations from the 624 zone.
485 Pressure Zone. This zone is at the northwestern edge of the Central Area system and is fed by gravity
from the 624 zone into the 485-1 reservoir located south of East H Street by an altitude valve. This supply
is supplemented when needed by pressure reducing stations from the 624 or 711 zone systems.
580 Pressure Zone. This is a small closed zone located in the northern portion of the Central Area system
south of the Sweetwater Reservoir and is fed by gravity through two pressure reducing stations off of the
711 zone system.
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Otay Water Facilities Master Plan Update Page 5-8 2024
624 Pressure Zone. This zone receives SDCWA and City of San Diego water for the entire Central Area
system. Storage is provided in the zone’s three reservoirs located near FCF 10 and FCF 12. The District
physically operates the 624 reservoirs to serve three subzone areas: 624-2 serves north of east H Street,
624-1 reservoir serves Telegraph Canyon and west, and 624-3 serves as a forebay for 711 PS and 980 PS.
The majority of the service area is in the western portion of the Central area. Normally closed pressure
reducing stations from the 711 and 980 transmission systems are also available for supplementing
supplies during high demand/low pressure periods.
711 Pressure Zone. This large zone in the center of the Central Area system is supplied from the 624-3
reservoir via the 711-1 PS. Storage is provided by three reservoirs, two located south of Otay Lakes Road
and the third at the north end of Hunte Parkway. Normally closed pressure reducing stations from the
980 zone are available for high demand/low pressure periods.
980 Pressure Zone. A large zone located in the eastern portion of the Central Area system is normally
supplied by pumping via the 980-2 pump station from the 624-3 reservoir. This zone can also be supplied
during emergencies by the 980-1 PS located near the 711-1 and 711-2 reservoirs that draws from the 711
zone. Storage is provided by two reservoirs located north of the former Salt Creek golf course..
1100 Pressure Zone. This small closed zone located in the northeastern portion of the Central Area system
is supplied by the Rolling Hills Ranch hydropneumatic pump station fed from the 980 zone.
Locations and boundaries of the Central Area system pressure zones are shown on in Exhibit IV. A
summary of the existing pressure zones within the Central Area system is provided at the beginning of
this section in Table 5-1.
Otay Mesa System
Within the Otay Mesa system there is currently one primary pressure zone. As shown on Exhibit V, the
Otay Mesa system serves the primarily industrial zones in the City and County of San Diego at the southern
end of the District, going as far south as the border with Mexico. Water transfers to Mexico are wheeled
through this system to the interconnection at the end of Alta Road. Water supply for the Otay Mesa
system is now normally taken from SDCWA Pipeline 4 through FCF 13 with the 870-2 pump station in
operation. The station has recirculation pumps and disinfection equipment that allows for the 571-1 (Roll)
reservoir to be used to control water quality. The previous method of the water supplied through either
FCF 12 or 13, delivered to the 624-3 reservoir to boost chloramine disinfection residual and then gravity
fed to the 571-1 reservoir by gravity via the District’s Interconnection is still available when needed. The
571-1 reservoir only provides forebay and emergency storage for the 870 system. The District’s
connection to the City of San Diego Otay WTP can also be accessed by the Otay Mesa system as an
alternate source of supply.
Upgrade to the Otay Mesa system since the previous WFMP includes the 870 low head and high head
pumping stations being replaced with a single pump station, 870-2. The older stations are still available
for use currently as an emergency stand-by.
571 Pressure Zone. This zone includes only the 571-1 (Roll) Reservoir on the northern end of the Otay
Mesa system which serves as a forebay for the 870 pumping station.
870 Pressure Zone. This zone is supplied by pumping from the 571-1 reservoir through the 870-2 PS to
the 870-1 reservoir and then to the distribution system.
Locations and boundaries of the Otay Mesa system pressure zones are shown on Exhibit V. A summary of
the existing pressure zones within the Otay Mesa system is provided at the beginning of this section in
Table 5-1.
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Otay Water Facilities Master Plan Update Page 5-9 2024
5.2.3 Pump Stations
The District currently maintains and operates 21 water pump stations in its potable water distribution
system. The majority of the pump stations are designed to lift water from a lower zone to a distribution
reservoir of a higher zone. These pump stations, which serve “open systems,” are normally operated at a
constant flow and are controlled by the water level in the distribution reservoir being pumped to. The
District also operates several hydropneumatic pump stations that are the only source of supply for these
high elevation and isolated zones, which lack a distribution reservoir. These pump stations must meet all
demand conditions, including peak hour and maximum day fire flow, and many operate with VFDs. The
hydraulic schematic of the system (Exhibit VI) shows the schematic location of every pump station. The
following sections summarize existing pump stations, including station identification, operating
characteristics, firm capacities, system demands, projected surpluses and deficits of pumping capacity and
other information relevant to each individual station. Firm capacity of the pump stations are based on
actual operating conditions and field tests.
North District System
The North District currently has 14 pump stations in potable water operations providing water to the La
Presa, Hillsdale and Regulatory systems. The Regulatory system includes seven of the fourteen pump
stations in the North District, with two of the seven serving stations serving closed zones
hydropneumatically, and the other five serving open zones with storage reservoirs. The Hillsdale system
contains four pump stations, one of which is hydropneumatic and serving a closed zone. The La Presa
system contains three pump stations, two of which serve open zones and one hydropneumatic station
serving a closed zone. Table 5-2 provides a summary of the existing pump stations in the North District,
by system, and presents the number of pump units, total and firm capacity, as well as suction and
discharge zones of each station.
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Otay Water Facilities Master Plan Update Page 5-10 2024
Table 5-2 North District Pump Stations
System
Pump Station
Duty/Fire Pumps
Suction
Discharge Zone
Station Type
Pump Station Capacity(1)
Total Firm
gpm MGD gpm MGD
La Presa
850-2 4 520/640 850 8,000 11.52 6,000 8.64
1004-2 3 640 1004 1,500 2.16 1,000 1.44
1050-1 2 / 1 850 1050 Hydro 480 0.69 240 0.35
Hillsdale
803-1 5 520/640 803 14,000 20.16 11,200 16.13
860-1 2 803 860 Hydro 140 0.20 100 0.10
978-1 4 803 978 3,100 4.46 2,250 3.24
1200-1 3 978 1200 1,500 2.16 1,000 1.44
Regulatory
832-1 3 520 832 6,300 9.07 4,200 6.05
944-1 4 832 944 4,700 6.77 3,000 4.32
1090-1 3 832 1090 560 0.81 560 0.81
1296-1 4 944 1296 4,650 6.70 2,900 4.18
1485-2 3 1296 1485 1,350 1.94 900 1.30
1530-1 2 / 1 1296 1530 Hydro 520 0.75 260 0.37
1655-1 4 1296 1655 Hydro 970 1.40 620 0.89
(1) The District provided updated firm pump capacities based on actual operating field conditions, pump tests, and review of
pump curves and in some cases has reduced nominal pump station capacities.
South District System
The South District currently has 7 pump stations in potable water operations providing water to the
Central Area and Otay Mesa systems. The Central Area system is the largest and most populous system in
the District, and the 980 zone has two large pump stations (one stand-by) that lift water from the 624 and
711 (stand-by) zones, respectively, to the 980 zone. The 711 zone pump station also draws from the 624
zone, and the 1100 hydropneumatic pump station from the 980 zone. The Otay Mesa system operates
one large, relatively flat pressure system served by the new 870-2 pump station with the 870-1 pump
station (comprised of the low head and high head pumps) acting as stand-by. Supply from the City of San
Diego Otay Water Treatment Plant is delivered to the District by the Temporary Lower Otay Pump Station
(TLOPS) to either the 571 zone or the 624 zone. Table 5-3 provides a summary of the existing pump
stations in the South District and presents the number of pump units, total and firm capacity, as well as
suction and discharge zones of each station. The 711-1 PS capacity was downgraded in 2011 from 16,000
gpm (4 pumps at 4,000 gpm) to 10,000 gpm (4 pumps at 2,500 gpm) to resolve cavitation issues related
to the pump suction piping.
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Otay Water Facilities Master Plan Update Page 5-11 2024
Table 5-3 South District Pump Stations
System
Pump Station
Duty/Fire Pumps
Suction
Discharge Zone
Station Type
Pump Station Capacity
Total Firm
gpm MGD gpm MGD
Central Area
711-1 5 624-1
624-3 711 12,500 18.00 10,000 14.40
980-1 3 711 980 Stand-by 12,000 17.28 8,000 11.52
980-2 4 624-1
624-3 980 16,000 23.04 12,000 17.28
1100-1 3 / 1 980 1100 Hydro 1,625 2.34 845 1.22
Otay Mesa
TLOPS 2 Otay WTP 571/624 12,500 18.00 10,000 14.40
870-1 8 571-1 870 Stand-by 14,500 20.88 11,000 15.84
870-2 5 571-1 870 16,000 23.04 12,000 17.28
5.2.4 Storage
The District currently operates 40 potable water reservoirs within its water distribution system. The total
existing storage capacity for the entire system is over 218 MG, and is shown in more detail in Table 5-4
and Table 5-5. The District’s reservoirs provide operational storage for serving daily variations in water
demand, as well as storage for fire flows and emergency water supply shortages and interruptions.
The District has had to lower operating levels of several reservoirs in the system to manage water quality
on a seasonal basis. In some cases, this level may be reduced to as low as 50 percent of normal storage.
The Master Plan presents a baseline assumption that the District can fully utilize 100 percent of normal
operating storage to meet its design criteria. This is particularly critical when analyzing the 10-day storage
requirements and the assumption of normal operating level, especially in the South District.
North District System
The North District includes 27 reservoirs located in 13 pressure zones. The reservoirs in the North District
vary in size from 0.31 MG to 20 MG. Where zones are served by pump stations or pressure reducing
stations only, their storage needs are accounted for in the zone from which they receive their supply. The
North District contains over 85 MG of storage, and with a current ADD below 9 MGD, many of the
reservoirs are operated at reduced water levels to avoid problems with water turnover and age related
quality issues.
South District System
The South District includes 13 reservoirs located in 7 pressures zones. Where zones are served by pump
stations or pressure reducing stations only, their storage needs are accounted for in the zone from which
they receive their supply. The reservoirs in the South District vary from 0.82 to 36.72 MG in size. The South
District contains over 133 MG of storage, and with a current ADD below 23 MGD, several of the reservoirs
are also operated at reduced water levels to avoid problems with water turnover and age related quality
issues.
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Otay Water Facilities Master Plan Update Page 5-12 2024
Table 5-4 North District Potable Water Storage Reservoirs
System
Reservoir
Capacity (MG)
High Water Level
(feet)
Year Built
Material
La Presa
640-1 10.0 640 2008 Concrete
640-2 10.0 640 2008 Concrete
657-1 (Emergency) 1.00 657 1957 Steel
657-2 (1-1A
Reservoir) 0.84 657 1990 Steel
850-1 (1-5 Reservoir) 1.12 851 1959 Steel
850-2 (20-1 Reservoir) 3.00 850 1976 Steel
850-3 (20-2
Reservoir) 3.10 851 1984 Steel
850-4 2.20 851 2008 Steel
1004-2 (Dictionary
Hill) 1.40 1004 2004 Steel
Hillsdale
803-2 (20-3
Reservoir) 2.00 803 1979 Steel
803-3 (Singing Hills) 2.15 804 1986 Steel
803-4 (Vista Grande) 5.76 803 2006 Steel
978-1 (3-2 Reservoir) 0.53 978 1959 Steel
978-2 (Filiponi) 2.50 978 1992 Concrete
1200-1 (Grant) 1.00 1200 1996 Steel
Regulatory
520-2 (Regulatory-2) 5.10 520 1983 Steel
520-3 (Emergency) 20.00 520 1992 Concrete
832-1 (2-1 Reservoir) 0.87 833 1962 Concrete
Aluminum
832-2 (2-1A
Reservoir) 1.96 832 1992 Steel
944-1 (9-1 Reservoir) 0.31 944 1962 Steel
944-2 (9-1A
Reservoir) 3.08 944 1992 Steel
1090-1 (2-2 Reservoir) 0.47 1090 1962 Concrete Aluminum
1296-1 (9-2
Reservoir) 1.02 1296 1962 Steel
1296-2 (9-2A
Reservoir) 2.01 1296 1991 Steel
1296-3 2.00 1300 2010 Concrete
1485-1 (9-3 Reservoir) 0.31 1485 1962 Steel
1485-2 (9-3A
Reservoir) 1.60 1485 2006 Steel
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Table 5-5 South District Potable Water Storage Reservoirs
System Reservoir Capacity (MG) High Water Level (feet) Year Built Material
Central Area
458-1 (10-1 Reservoir) 0.82 458 1964 Steel
458-2 (10-2 Reservoir) 1.75 458 1967 Steel
485-1 (22-2 Reservoir) 1.00 485 1983 Steel
624-1 (Patzig Reservoir) 12.40 624 1965 Earth Embank
624-2 (22-3 Reservoir) 8.13 624 1988 Steel
624-3 (Eastlake) 30.00 624 1997 Concrete
711-1 (22-1 Reservoir) 3.10 711 1976 Steel
711-2 (22-1A Reservoir) 2.30 711 1993 Steel
711-3 (22-1B Reservoir) 16.00 711 2002 Earth Embank
980-1 (22-4 Reservoir) 5.02 979 1985 Steel
980-2 (22-5 Reservoir) 5.02 979 1989 Steel
Otay Mesa 571-1 (Roll) 36.72 571 1967 Earth Embank
870-1 (Upper) 10.98 870 1963 Earth Embank
5.2.5 Pressure Reducing Stations
The District maintains several pressure reduced zones, due primarily to large elevation changes in the
western portion of the Central service area and a portion of the La Presa System, where it is necessary to
reduce operating pressures. In addition, the District maintains a number of redundant PRSs designed to
serve lower pressure zones from high zones in the event of a system outage in the lower zone or
potentially a high fire flow requirement. These PRSs allow the District to utilize emergency storage and
fire storage from higher zones to lower zones. This is taken into consideration in the storage analysis in
Section 5.3. The District also utilizes PRSs in key zone locations to supplement flow during peak hour
conditions. This is accomplished by adjusting the downstream pressure to only open during large pressure
swings.
The District’s typical standard for a PRS include both a main pressure reducing valve and a small reducing
valve to cover a wide range of flow operations. Valves are housed usually in pre-cast concrete vaults and
may also include a pressure relief valve designed to protect the lower system from over-pressurization in
the event of a valve failure. New PRSs are typically equipped with SCADA to allow remote monitoring.
North District
The North District includes a reduced pressure zone in La Presa that is always fed from a higher zone,
shown in Table 5-6. The Regulatory system has included several redundant PRSs to allow flow from higher
zones to lower zones. These PRSs are usually at or near the pump station serving the Regulatory system.
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Otay Water Facilities Master Plan Update Page 5-14 2024
Table 5-6 North District Potable Pressure Reducing Stations
System From/To Zones Purpose Location Valve Size (inch)
La Presa
640/493 Normal Operation Jamacha/Pecos 4 & 4
640/493 Normal Operation San Diego St 6 & 4
6571/493 Normal Operation Galopago/Maya 4 & 4
6571/493 Normal Operation Banock/Pecos 4 & 4
850/640 Standby Regulatory Site (near 850-2 PS) 10
850/640 Standby Regulatory Site (near 803-1 PS) 12
850/6571 Standby Jamacha Blvd 10 & 6
850/6571 Standby 657 Reservoir Site 8
1004/850 Standby Cuyamaca Ave 6
1004/850 Standby Pointe Pkwy/Celestial Waters 8 & 4
1004/850s Normal Operation Eucalyptus/Ramona 8 & 3
1004/850s Normal Operation San Miguel/Date 8 & 3
1050/8502 Standby Pointe Pkwy/Valley Waters 10 & 4
Hillsdale 803/520 Standby Cuyamaca College Dr W 10 & 4
803/640 Standby Regulatory Site (near 803-1 PS) 12
Regulatory
1296/932 Normal Operation Jamul Dr 4 & 4
832/520 Standby 832-2 PS Site 12
832/8033 Standby Steele Canyon Dr 12
640/520 Normal Operation Regulatory Site (near 520-3 Res) Four 12
1. Normal operation for the 657 PZ is at an HGL of 640 ft, but can be readjusted to 657 ft in the event of an emergency 2. The 1050/850 PRS is currently inoperable due to valving issues 3. The 832/803 PRS is to be abandoned at current location
South District
The Central service area includes several normally pressure reduced zones along the eastern boundary
that must be reduced from the 624 zone. These include the 485 and 458 zones, respectively, where each
zone also includes small operating reservoirs. The 458 zone also exclusively feeds the reduced 380 zone
with several PRSs. In the north, a small 580 zone is exclusively supplied by the 711 zone. Operators may
periodically adjust pressure setting based on system wide demands, water quality management, and
other system factors.
Two of the largest District pressures zones, the 624 and 711 zones, because of their zone size and distance
from their main sources of supply, must be supplied in some cases from the higher pressure zone to meet
peak hour pressures or to provide adequate fire flows. Therefore, the District operates several 711/624
and 980/711 PRSs to meet overall system design criteria, and to provide redundancy throughout the
Central area system, shown in Table 5-7.
Chapter 5 Potable Water System Evaluation
Otay Water Facilities Master Plan Update Page 5-15 2024
Table 5-7 South District Potable Pressure Reducing Stations
System From/To Zones Purpose Location Valve Size (inch)
Central Area
458/380 Normal Operation Brandywine/Main 8 & 4
458/380 Normal Operation Melrose Ave 8 & 4
458/380 Normal Operation Oleander Ave 8 & 4
624/4581 Normal Operation 458 Reservoir Site 12
624/458 Standby Sequoia/Brandywine 10 & 4
624/458 Standby E Palomar St 10 & 4
624/458 Standby Oleander Ave 8
624/4851 Normal Operation 485-1 Reservoir Site 12
624/485 Standby 485-1 Reservoir Site 12 & 3
624/485 Standby Terra Nova/Plaza del Cid 10 & 4
711/485 Standby Paseo del Rey/E H St 8
711/580 Normal Operation Mount Miguel/SR 125 8 & 4
711/580 Normal Operation Proctor Valley Rd 8 & 3
711/624 Standby Canyon/ Otay Lakes 8 & 4
711/624 Standby Corral Canyon Rd 6 & 4
711/624 Standby Heritage Rd 10 & 6
711/624 Standby Olympic Pkwy 10 & 6
711/624 Standby Paseo Ranchero/ E H St 8 & 4
980/624 Standby Chateau/Creekwood 12
980/711 Standby Avenida Belterra/Mount Miguel 8 & 4
980/711 Standby Chateau/Creekwood 8
980/711 Standby Proctor Valley/Mount Miguel 6 & 2
Otay Mesa 624/571 Normal Operation Roll Reservoir 12
1. The 624 PZ feed to the 458 and 485 reservoirs is via an altitude valve acting as a PRS
5.2.6 Pipelines
The potable water system is comprised of approximately 750 miles of distribution and transmission piping,
which conveys water from the supply sources to the storage tanks and to the customers. Pipe diameters
range up to 66 inches, with much of the system being 6-inch through 16-inch diameter pipes, shown in
Figure 5-3. Pipe ages span from the 1950’s to present, with most of the distribution system installed
between 1980 to 2010, shown in Figure 5-2. The material asbestos cement pipe (ACP) dominates the
piping installed before the mid 1990’s, with PVC as the common material for pipes installed from the mid
1990’s to present.
Chapter 5 Potable Water System Evaluation
Otay Water Facilities Master Plan Update Page 5-16 2024
1,200,000
200
1,000,000
800,000 150 600,000
100
400,000 50
200,000
0 1950
1960
1970
1980
1990
2000
2010 0 2020
Decade of Installation
Figure 5-2: Pipe Summary – Decade of Installation
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Chapter 5 Potable Water System Evaluation
Otay Water Facilities Master Plan Update Page 5-17 2024
1,800,000
1,600,000 300
1,400,000
1,200,000
1,000,000
250 200
800,000 150
600,000
400,000
200,000
100
50
0 0 1 2 3 4 0 6 8 10 12 14 16 18 20 21 24 27 30 36 42 48 60 66
Diameter
Figure 5-3: Pipe Summary – Diameter
North District
The North District consists of about 280 miles of distribution and transmission piping, with about 70
percent installed before 1990. About 75 percent of the North District uses ACP, with PVC, at about 13
percent, as the next common material.
South District
The South District consists of about 470 miles of distribution and transmission piping, with about 65
percent installed after 1990. About half of the South District uses PVC, with ACP, at about 41 percent, as
the next common material.
5.2.7 Emergency Interconnections
There are several existing emergency interconnections with neighboring agency systems that can provide
relatively small quantities of water to benefit the District, the other agency or both, a list is shown in Table
5-8. The locations of the interconnections are shown on Exhibits I through V and Appendix A. These
connections are typically used when performing shutdowns within specific localized pressure zones for
planned operational circumstances or in the event of an emergency within an agency unrelated to SDCWA
system operations. In many cases, the interconnections are at different operating pressures requiring the
District to install temporary pumping facilities to fully utilize.
The District has eight existing minor interconnections with the Helix WD, all eight of which are capable of
supplying the District with water. The District has eight existing minor interconnection with Sweetwater
Authority, one of which is capable of supplying the District with water. The District has one existing minor
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Chapter 5 Potable Water System Evaluation
Otay Water Facilities Master Plan Update Page 5-18 2024
interconnection with Cal-American (Cal-Am) that is capable of supplying this private water company with
water. The District has seven existing minor interconnections with the City of San Diego, five of which are
capable of supplying the District with water.
The District has one emergency connection with Mexico (Mexico Connection) that is capable of supplying
the City of Tijuana with water. The Mexico Connection is located near the international border east of the
Second Border crossing within the Otay Mesa System 870 Pressure Zone and has a capacity of
approximately 20.0 cfs (8,976 gpm or 12.9 MGD). The SDCWA actually wheels water through the District’s
870 zone system via an agreement between Mexico and Metropolitan Water District for access to
imported Colorado River water.
Chapter 5 Potable Water System Evaluation
Otay Water Facilities Master Plan Update Page 5-19 2024
Table 5-8 Emergency Interconnections
OWD Connection Identification OWD Water System & Zone Flow Rate (gpm) & Direction Status/Notes
He
l
i
x
W
a
t
e
r
D
i
s
t
r
i
c
t
H1 Blossom Lane La Presa (Aqueduct) 800 bidirectional
H2 Grand Avenue La Presa (850) 200 to OWD
H3 Ivy Street La Presa (850) 400 bidirectional
H4 Sir Francis Drake Drive La Presa (850) 800 to OWD
H5 Vista Grande Road Hillsdale (978) 1,000 bidirectional
H6 Sweetwater Springs Blvd La Presa (850) 800 bidirectional
H7 Del Rio Road La Presa (850) 400 bidirectional
H8 Gillispie Drive La Presa (640) 800 bidirectional
H-# Chase & Fuerte Hillsdale (978) FUTURE FUTURE
Sw
e
e
t
w
a
t
e
r
A
u
t
h
o
r
i
t
y
SW1 East Oxford Street Central Area (458) 1,000 bidirectional
SW2 East Naples Street Central Area (624) 1,000 to SWA
SW3 Douglas Street Central Area (711) 350 to SWA
SW4 Proctor Valley Road Central Area (580) 140 to SWA Routine sole supply to SWA meters
(non-emergency)
SW5 Cherry Hills Lane Central Area (624) 1,000 to SWA
SW6 Jamacha Boulevard La Presa (657 PZ) 1,000 to SWA
SW7 Bay Leaf Drive Central Area (485) 800 to SWA
SW8 Camino Elevado Drive Central Area (624) 800 to SWA
Ci
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o
f
S
a
n
D
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o
SD1 Glen Vista Street La Presa (640) 700 bidirectional
SD2 Heritage Road Otay Mesa (870) 5,000 to City Existing stubouts for OWD portable
trailer pump not mentioned in
agreement text.
SD3 Brown Field Otay Mesa (870) 2,000 to City
SD4 Otay Rio
(Entertainment)
Central Area (340) 5,000 to OWD
SD5 Telegraph Canyon Rd
(two OWD trailer pump
connections)
Central Area (624) 2,500 to OWD Existing stubouts for OWD portable
trailer pumps, stubouts to City appear
deactivated Central Area (711) 2,500 to OWD
SD6 East H Street Central Area (485) 1,500 to OWD
SD8 Lower Otay Pump Station (LOPS) Central Area (624) 5,000 bidirectional OWD semi-permanent trailer pump
Cal Am (CA-1) Otay Valley Road Central Area (340) 1,000 to CalAm Agency Option
Mexico (MX-1) South end of Alta Rd. Otay Mesa (870) 9,000 to Mexico Agreement between OWD and SDCWA.
Padre Dam (P-#) Dehesa Valley Road Hillsdale (803) FUTURE FUTURE
Chapter 5 Potable Water System Evaluation
Otay Water Facilities Master Plan Update Page 5-20 2024
5.3 Distribution Storage and Pumping Analysis
This section presents the potable water system capacity analysis for water storage and pumping facilities,
and identifies any deficiencies in the existing system based on the design criteria presented in Chapter 2
and presents an analysis of the 2030 and 2055 demand conditions.
Existing Water System
Total operational storage and pumping requirements are calculated based on the planning criteria
outlined in Chapter 2. The pumping capacity analysis includes the assessment of 16-hours pumping period
on MDD, and provides a comparison to both 16 and 24 hours.
Existing Storage Analysis
The storage calculations for supplying primary pressure zones include the secondary pressure zone
demands served by pressure reducing stations and hydropneumatic pump stations. Table 5-9 and Table
5-10 present the reservoir storage balance calculations for the operational storage required for each
system in the North and South District, respectively. The storage analysis shows that the North and South
Districts have total storage surpluses of 50 MG, and 79 MG, respectively, for handling normal system
demands. Part of this is contributed to lower average annual water demands and reduced peaking system
wide during MDD as storage is a direct function of the MDD. Only one pressure zone, the 980 in the Central
Area, shows a current deficit for storage, but as this zone has two fully redundant supply pump stations
and considering the surplus storage in the South District, the increased storage addition can be phased in
considering the timing of further development infrastructure in the area.
Chapter 5 Potable Water System Evaluation
Otay Water Facilities Master Plan Update Page 5-21 2024
Table 5-9 Existing North District Distribution Storage Analysis
Zone
Capacity (MG)
Required Storage per Design Criteria (MG) Surplus/ (Deficit) (MG) Operational (0.30 x MDD) Fire Emergency (1.0 x MDD) Total
La Presa
640(1) 20.0 1.26 1.20 4.19 6.65 13.35
657/640(2) 1.8 0.34 0.18 1.12 1.64 0.16
850(3) 9.4 1.68 1.20 5.45 8.29 1.11
1004 1.4 0.05 0.30 0.16 0.51 0.89
Hillsdale
803(4) 10.0 1.06 1.20 3.53 5.79 4.21
978 3.0 0.46 0.30 1.53 2.29 0.71
1200 1.0 0.11 0.30 0.37 0.78 0.22
Regulatory
520 25.1 0.18 1.20 0.60 1.98 23.12
832 2.9 0.19 1.20 0.62 2.01 0.89
944 3.4 0.01 0.30 0.01 0.32 2.68
1090 0.5 0.01 0.30 0.05 0.36 0.14
1296(5) 5.0 0.35 1.20 1.15 2.70 2.30
1485 1.9 0.14 1.20 0.46 1.80 0.10
North Subtotal 85.4 35.12 50.28
MDD = Maximum Day Demand
(1) Storage for the 640 zone includes demands for the reduced 493 zone and 657 zone normally operated at 640 HGL.
(2) Information provided for emergency use of zone operating at 657 HGL.
(3) Includes demands for the 1050 Pointe hydropneumatic system.
(4) Includes demands for the 860 Cottonwood hydropneumatic system.
(5) Includes demands for the 932, 1530, and 1655 zones
Table 5-10 Existing South District Distribution Storage Analysis
Zone
Capacity (MG)
Required Storage per Design Criteria (MG) Surplus/ (Deficit) (MG) Operational (0.30 x MDD) Fire Emergency (1.0 x MDD) Total
Central
458(1)(2) 2.6 0.55 1.20 1.83 3.58 N/A
485(2) 1.0 0.30 1.20 1.00 2.50 N/A
624(3) 50.5 1.94 1.20 6.45 9.59 38.43
711(4) 21.4 3.43 1.20 11.44 16.08 5.32
980(5) 10.0 3.17 1.20 10.57 14.94 (4.94)
Otay Mesa
571 36.7 0.09 0.00 0.31 0.40 36.3
870 11.0 1.37 1.20 4.58 7.15 3.85
South Subtotal 133.2 54.24 78.96
Chapter 5 Potable Water System Evaluation
Otay Water Facilities Master Plan Update Page 5-22 2024
MDD = Maximum Day Demand (1) Storage for the 458 zone includes demands for the reduced 380 zone. (2) The 458 and 485 zones are fed continuously by gravity from the 624 zone through altitude valves so their storage is not limited by the storage on their level. (3) Storage deficit for the 458 and 485 zones removed from the 624 zone surplus. (4) Includes demands for the reduced 580 zone.
(5) Includes demands for the 1100 Rolling Hills Ranch hydropneumatic system.
Existing Pump Station Capacity Analysis
As part of the Master Plan update, the District desired to take a closer look at pumping capacity including
more accurately addressing pump station “firm” capacity and planning to accommodate off-peak
pumping. The District conducted several field tests and observed SCADA data for a number of water pump
stations and prepared updated firm capacity recommendations for each pump station. Firm capacity is
based on the largest pump out of service and actual pumping rates of the remaining pumps. This takes
into consideration local hydraulic constraints and normal wear of pumps.
The ability to off-peak pump has become more critical in managing and controlling energy costs.
Historically, the District has designed pump stations to supply the total MDD over a 24-hour pumping
period. Since maximum days only occur in the summer months, most of the year the pump station would
run less than 24 hours. However, given the high cost due to demand charges to operate during peak time,
the District has transitioned to off-peak pumping schedules, where feasible. Through close coordination
with SDG&E, the District has established time of use schedules for all the pump stations to accommodate
the most favorable rate. For the purposes of the Master Plan, required pumping capacities by pressure
zone have been shown based on a preferred 16-hour period and 24-hour MDD pumping periods. Peak
hour demand has been shown for all of the pressure zones but is of primary interest for the closed zones
which must meet these demands without storage, in addition to maximum day plus fire flow where this
is provided.
The pumping calculations for supplying primary pressure zones are cumulative and include demands for
the direct pumped zone and all zones above. Table 5-11 and Table 5-12 present the pump station capacity
analysis for the existing system for the North and South Districts, respectively.
As with operational storage needs, the reduced system-wide MDD has improved pump station capacities.
In most cases, especially for the smaller zones, the District has sufficient MDD capacity to pump over 16-
hour period. However, the Central Area pressure zone future demands will likely increase the pumping
requirements and need for increased pump station capacity.
Chapter 5 Potable Water System Evaluation
Otay Water Facilities Master Plan Update Page 5-23 2024
Table 5-11 Existing North District Pump Stations Analysis
System
Pump Station
Station Type
Firm Capacity gpm
Max Day or Peak Hour Demand (gpm) Surplus / (Deficit) (gpm)
24-Hour Peak Hour 16-Hour 24-Hour Peak Hour 16-Hour
La Presa
850-2 6,000 3,787 7,520 5,680 2,213 N/A 320
1004-2 1,000 113 263 169 887 N/A 831
1050-1 Hydro 240 85 199 128 155 41 112
Hillsdale
803-1 11,200 3,773 7,722 5,660 7,427 N/A 5,540
860-1 Hydro 100 28 66 43 72 34 57
978-1 2,250 1,324 2,825 1,986 926 N/A 264
1200-1 1,000 259 605 389 741 N/A 611
Regulatory
832-1 4,200 1,594 3,477 2,390 2,606 N/A 1,810
944-1 3,000 1,160 2,519 1,740 1,840 N/A 1,260
1090-1 560 33 78 50 527 N/A 510
1296-1 2,900 1,122 2,430 1,683 1,778 N/A 1,217
1485-2 900 322 711 482 578 N/A 418
1530-1 Hydro 260 37 87 56 223 173 204
1655-1 Hydro 620 25 57 37 595 563 583
Table 5-12 Existing South District Pump Stations Analysis
System
Pump Station
Station Type
Firm Capacity gpm
Max Day or Peak Hour Demand (gpm) Surplus / (Deficit) (gpm)
24-Hour Peak Hour 16-Hour 24-Hour Peak Hour 16-Hour
Central
711-1 10,000 7,946 14,184 11,919 2,054 N/A (1,919)
980-1 Standby 8,000 0 0 0 8,000 N/A 8,000
980-2 12,000 7,340 13,357 11,011 4,660 N/A 989
1100-1 Hydro 845 352 778 528 493 67 317
Otay Mesa
TLOPS Standby 10,000 0 0 0 10,000 N/A 10,000
870-1 Standby 11,000 0 0 0 11,000 N/A 11,000
870-2 12,000 3,180 6,219 4,770 8,820 N/A 7,230
The 711-1 Pump Station is assumed to be upgraded to 14,000 gpm firm capacity during Phase I or early in
Phase II of the planning timeline.
Phase II (2030) and Phase III (2055) Storage and Pumping Analysis
Water storage and pumping analysis were developed for 2030 and 2055 demand conditions based on the
projected water demands by pressure zone. Tables 5-13 through 5-20 present the Phase II and Phase III
storage and pumping analysis findings based upon the water demand forecast and the design criteria.
Current active CIP projects to increase storage and pumping are reflected in the updated infrastructure
capacity, reference the indicated footnote for the project number. As expected, high growth areas such
as the 980 zone will need to upgrade pumping and storage capacity.
Chapter 5 Potable Water System Evaluation
Otay Water Facilities Master Plan Update Page 5-24 2024
Table 5-13 Phase II North District Distribution Storage Analysis
Zone
Capacity (MG)
Required Storage per Design Criteria (MG) Surplus/ (Deficit) (MG) Operational (0.30 x MDD) Fire Emergency (1.0 x MDD) Total
La Presa
640(1) 20.0 1.22 1.20 4.07 6.49 13.51
657/640(2) 1.8 0.34 0.18 1.12 1.64 0.16
850(3) 9.4 1.72 1.20 5.75 8.67 0.72
1004 1.4 0.06 0.30 0.16 0.52 0.88
Hillsdale
803(4) 10.0 1.15 1.20 3.83 6.17 3.83
978 3.0 0.43 0.30 1.44 2.17 0.83
1200 1.0 0.14 0.30 0.45 0.89 0.11
Regulatory
520 25.1 0.16 1.20 0.54 1.90 23.20
832 2.9 0.17 1.20 0.56 1.93 0.97
944 3.4 0.01 0.30 0.01 0.32 2.68
1090 0.5 0.02 0.30 0.06 0.38 0.12
1296(5) 5.0 0.43 1.20 1.44 3.08 1.92
1485 1.9 0.13 1.20 0.45 1.78 0.12
1655 0.5 0.03 0.30 0.11 0.44 0.06
North Subtotal 85.9 36.38 49.11
MDD = Maximum Day Demand
(1) Storage for the 640 zone includes demands for the reduced 493 zone and 657 zone normally operated at 640 HGL.
(2) Information provided for emergency use of zone operating at 657 HGL. Tanks are proposed to be demolished.
(3) Includes demands for the 1050 Pointe hydropneumatic system.
(4) Includes demands for the 860 Cottonwood hydropneumatic system. (5) Includes demands for the 932 and 1530 zones
The 1655-1 Reservoir is assumed to be constructed during Phase I or early in Phase II of the planning
timeline. No new storage is required in the North District through Phase II.
Chapter 5 Potable Water System Evaluation
Otay Water Facilities Master Plan Update Page 5-25 2024
Table 5-14 Phase II South District Distribution Storage Analysis
Zone
Capacity (MG)
Required Storage per Design Criteria (MG) Surplus/ (Deficit) (MG) Operational (0.30 x MDD) Fire Emergency (1.0 x MDD) Total
Central
458(1)(2) 2.6 0.69 1.20 2.30 4.19 N/A
485(2) 1.0 0.29 1.20 0.98 2.47 N/A
624(3) 50.5 1.99 1.20 6.63 9.82 40.68
711(4) 21.4 3.76 1.20 12.52 17.48 3.92
980(5) 10.0 4.21 1.20 14.04 19.45 (9.45)
Otay Mesa
571 36.7 0.09 0.00 0.31 0.40 36.3
870(6) 14.4 2.68 1.20 8.92 12.79 1.61
South Subtotal 136.6 66.6 70.0
MDD = Maximum Day Demand (1) Storage for the 458 zone includes demands for the reduced 380 zone. (2) The 458 and 485 zones are fed continuously by gravity from the 624 zone through altitude valves so their storage is not limited by the storage on their level. (3) Storage deficit for the 458 and 485 zones removed from the 624 zone surplus. (4) Includes demands for the reduced 580 zone.
(5) Includes demands for the 1100 Rolling Hills Ranch hydropneumatic system.
(6) Includes addition of the 870-2 Reservoir (CIP P2228).
Growth in the 980 zone is projected to include new storage reservoirs that are not included in the storage
capacity presented in Phase II. The District will be coordinating the infrastructure sizing with the
developments to incorporate additional capacities required for the service area. If the timing or certainty
of the Village 13 and/or 14 storage reservoirs become in doubt, the District will review and adjust the
sizing and timing of the 980-4 Reservoir.
Chapter 5 Potable Water System Evaluation
Otay Water Facilities Master Plan Update Page 5-26 2024
Table 5-15 Phase II North District Pump Stations Analysis
System
Pump Station
Station Type
Firm Capacity gpm
Max Day or Peak Hour Demand (gpm) Surplus / (Deficit) (gpm)
24-Hour Peak Hour 16-Hour 24-Hour Peak Hour 16-Hour
La Presa
850-2 6,000 3,993 7,856 5,990 2,007 N/A 10
1004-2 1,000 113 263 169 887 N/A 831
1050-1 Hydro 240 85 199 128 155 41 112
Hillsdale
803-1 11,200 3,965 8,965 5,948 7,427 N/A 5,540
860-1 Hydro 100 28 66 43 72 34 57
978-1 2,250 1,324 2,825 1,986 926 N/A 264
1200-1 1,000 314 694 471 686 N/A 529
Regulatory
832-1 4,200 1,825 4,007 2,737 2,375 N/A 1,463
944-1 3,000 1,439 3,154 2,737 1,561 N/A 263
1090-1 560 44 103 66 516 N/A 494
1296-1 2,900 1,387 3,033 2,080 1,513 N/A 820
1485-2 900 321 711 482 579 N/A 418
1530-1 Hydro 260 37 87 56 223 173 204
1655-1 620 76 176 113 544 N/A 507
Table 5-16 Phase II South District Pump Stations Analysis
System
Pump Station
Station Type
Firm Capacity gpm
Max Day or Peak Hour Demand (gpm) Surplus / (Deficit) (gpm)
24-Hour Peak Hour 16-Hour 24-Hour Peak Hour 16-Hour
Central
711-1(1) 14,000 8,694 15,212 13,041 5,306 N/A 959
980-1 Standby 8,000 0 0 0 8,000 N/A 8,000
980-2 12,000 9,749 16,883 14,624 2,251 N/A (2,624)
1100-1 Hydro 845 352 778 528 493 67 317
Otay Mesa
TLOPS Standby 10,000 0 0 0 10,000 N/A 10,000
870-1 Standby 11,000 0 0 0 11,000 N/A 11,000
870-2 12,000 6,193 11,304 9,290 5,807 N/A 2,710
(1) The 711-1 PS is being renovated under CIP P2578 during Phase I.
The 980-2 PS includes a surplus in the 24-hour scenario but a noted deficit in the 16-hour scenario. This
pump station is currently under evaluation and modification. Through this process a higher firm
capacity may be achieved (e.g. 15,000 gpm). Although the 980-1 PS has excess capacity during both
scenarios and would accommodate the deficit it is standby and planned for decommissioning. If the
higher flow rate at 980-2 PS can be achieved the 980-1 PS will be considered for decommissioning to
reduce the financial burden of maintaining the excess capacity provided by the pump station. A re-
consideration of the flow rate for 980-2 PS at the next WFMP Update is recommended and, if
appropriate, alternative pumping scenarios considered. The 980-1 PS decommissioning and timing is
contingent on more information.
Chapter 5 Potable Water System Evaluation
Otay Water Facilities Master Plan Update Page 5-27 2024
Table 5-17 Phase III North District Distribution Storage Analysis
Zone
Capacity (MG)
Required Storage per Design Criteria (MG) Surplus/ (Deficit) (MG) Operational (0.30 x MDD) Fire Emergency (1.0 x MDD) Total
La Presa
640(1) 20.0 1.30 1.20 4.32 6.82 13.18
657/640(2) 1.8 0.34 0.18 1.12 1.64 0.16
850(3) 9.4 1.81 1.20 6.04 9.05 0.35
1004 1.4 0.05 0.30 0.15 0.50 0.90
Hillsdale
803(4) 10.0 1.20 1.20 4.01 6.41 3.59
978 3.0 0.45 0.30 1.50 2.25 0.75
1200 1.0 0.15 0.30 0.48 0.93 0.07
Regulatory
520 25.1 0.17 1.20 0.56 1.93 23.17
832 2.9 0.18 1.20 0.58 1.96 0.94
944 3.4 0.01 0.30 0.01 0.32 2.68
1090 0.5 0.02 0.30 0.06 0.38 0.12
1296(5) 5.0 0.44 1.20 1.48 3.12 1.88
1485 1.9 0.15 1.20 0.49 1.84 0.06
1655 0.5 0.03 0.30 0.11 0.44 0.06
North Subtotal 85.9 37.59 48.31
MDD = Maximum Day Demand
(1) Storage for the 640 zone includes demands for the reduced 493 zone and 657 zone normally operated at 640 HGL.
(2) Information provided for emergency use of zone operating at 657 HGL. Tanks are proposed to be demolished.
(3) Includes demands for the 1050 Pointe hydropneumatic system.
(4) Includes demands for the 860 Cottonwood hydropneumatic system. (5) Includes demands for the 932 and 1530 zones
Chapter 5 Potable Water System Evaluation
Otay Water Facilities Master Plan Update Page 5-28 2024
Table 5-18 Phase III South District Distribution Storage Analysis
Zone
Capacity (MG)
Required Storage per Design Criteria (MG) Surplus/ (Deficit) (MG) Operational (0.30 x MDD) Fire Emergency (1.0 x MDD) Total
Central
458(1)(2) 2.6 0.74 1.20 2.46 4.40 N/A
485(2) 1.0 0.31 1.20 1.03 2.54 N/A
624(3) 50.5 2.65 1.20 8.83 12.68 30.88
711(4) 22.6 4.96 1.20 16.53 22.69 (0.09)
980(5)(7) 19.0 5.38 1.20 17.93 24.51 (5.51)
Otay Mesa
571 36.7 0.09 0.00 0.31 0.40 36.3
870(6) 14.4 3.83 1.20 12.75 17.78 (3.38)
South Subtotal 146.8 85.0 61.8
MDD = Maximum Day Demand (1) Storage for the 458 zone includes demands for the reduced 380 zone. (2) The 458 and 485 zones are fed continuously by gravity from the 624 zone through altitude valves so their storage is not limited by the storage on their level. (3) Storage deficit for the 458 and 485 zones removed from the 624 zone surplus. (4) Includes demands for the reduced 580 zone.
(5) Includes demands for the 1100 Rolling Hills Ranch hydropneumatic system.
(6) Includes addition of the 870-2 Reservoir of 3.4MG (CIP P2228).
(7) All previously planned water storage improvement projects are included in the Phase III 980 Zone storage capacity.
Chapter 5 Potable Water System Evaluation
Otay Water Facilities Master Plan Update Page 5-29 2024
Table 5-19 Phase III North District Pump Stations Analysis
System
Pump Station
Station Type
Firm Capacity gpm
Max Day or Peak Hour Demand (gpm) Surplus / (Deficit) (gpm)
24-Hour Peak Hour 16-Hour 24-Hour Peak Hour 16-Hour
La Presa
850-2 6,000 4,193 8,220 6,290 1,807 N/A (290)
1004-2 1,000 113 263 169 887 N/A 831
1050-1 Hydro 240 85 199 128 155 41 112
Hillsdale
803-1 11,200 4,164 8,396 6,246 7,036 N/A 4,954
860-1 Hydro 100 29 66 43 71 34 57
978-1 2,250 1,330 2,919 2,070 920 N/A 180
1200-1 1,000 336 743 504 664 N/A 496
Regulatory
832-1 4,200 1,897 4,166 2,845 2,303 N/A 1,355
944-1 3,000 1,491 3,269 2,237 1,509 N/A 763
1090-1 560 42 99 64 518 N/A 496
1296-1 2,900 1,441 3,152 2,161 1,459 N/A 739
1485-2 900 340 751 509 560 N/A 391
1530-1 Hydro 260 37 87 56 223 173 204
1655-1 620 74 174 112 546 N/A 508
Table 5-20 Phase III South District Pump Stations Analysis
System
Pump Station
Station Type
Firm Capacity gpm
Max Day or Peak Hour Demand (gpm) Surplus / (Deficit) (gpm)
24-Hour Peak Hour 16-Hour 24-Hour Peak Hour 16-Hour
Central
711-1(1) 14,000 11,480 19,305 17,220 2,520 N/A (3,220)
980-1 Standby 8,000 0 0 0 8,000 N/A 8,000
980-2 16,000 12,452 20,579 18,679 3,548 N/A (2,679)
1100-1 Hydro 845 352 778 528 493 67 317
Otay Mesa
TLOPS Standby 10,000 0 0 0 10,000 N/A 10,000
870-1 Standby 11,000 0 0 0 11,000 N/A 11,000
870-2(2) 12,000 8,855 15,268 13,283 3,145 N/A (1,283)
(1) The 711-1 PS is being renovated under CIP P2578 during Phase I to the 14,000 gpm.
(2) The 870-2 PS has engine driven pumps that can cover the 16-hour deficit demands.
Pump stations can meet demands over the 24-hour period. 980-2 and 870-2 both have standby pump
stations able to assist in meeting demands in 16 hours. However, the standby stations 980-1 and 870-1
are planned for decommissioning to manage maintenance costs. Phase III projects and capacities will be
evaluated in future updates to the WFMP.
Chapter 5 Potable Water System Evaluation
Otay Water Facilities Master Plan Update Page 5-30 2024
5.4 Recommended Potable Water System Improvements
This section summarizes the major proposed potable water facilities necessary to address existing system
deficiencies and meet future demands and planned growth in the District. The North District needs are
primarily reliability driven, except for a few planned development areas. In contrast, the South District
needs are primarily growth driven by large-scale residential village developments within the Otay Ranch
General Plan Development area and the City of San Diego’s Otay Mesa Community Plan Update area. It is
anticipated that developers will construct a majority of the planned water infrastructure, in particular
water distribution facilities within local streets and major circulation roadways. The District will typically
be the lead on major storage, pumping and transmission pipeline improvement projects.
Historically, the District had categorized water transmission mains 16-inch and larger as a District CIP
project and included them in the analysis to determine water capacity fees. As part of the master plan
update, CIP projects were primarily identified and noted based on the regional benefit in serving the water
system including multiple development areas and/or reliability to the water system. In particular, as the
Central Service Area builds out, there are fewer major roadway projects connecting developments and
therefore fewer CIP projects anticipated.
The remaining section includes a CIP project summary and description by major water system. Chapter 7
presents the detailed CIP list and recommended phasing.
5.4.1 La Presa System
The La Presa water system is nearing build-out and should continue to be supplied from the east via FCF
14 and the 640 regulatory reservoirs. Redundancy to the system is provided by FCF 11 which offers the
service area two independent water supplies.
The only remaining areas to potentially have further development include the Pointe site near the
District’s office and the Dictionary Hill area. With these limited developments remaining, no capacity
projects are required. The District has converted the 657 zone to normally operate on the 640 zone while
still being able to convert back and accept reduced flow from the 850 zone though existing PRVs when
flow is taking water from FCF 11. A summary of CIP is included below:
Existing System Projects
■Operational: Conversion of the 657 zone to 640 zone will require additional work including the
ultimate abandonment and removal of the two existing 657 reservoirs, piping interconnections
and one new redundant PRS to ensure fire flows can be met. (P2584)
■System Reliability: Add a new 16-inch pipeline in the 850 zone in Jamacha Boulevard northeast
of Sweetwater Springs Road to provide an additional transmission pipeline to the zone and
increase transmission capacity to the southern 850 reservoirs. (P2148)
■Replacement: Replacement of aging and difficult to access pipelines in the 640 zone with a new
12-inch water line in Osage Drive and Jamacha Road between Dorchester and Elkelton. (P2516)
■Replacement: Completion of the replacement of aging and undersized pipelines in the 850 zone
with a new 8-inch water line in Coronado Avenue between Chestnut and Apple Streets. (P2608)
Chapter 5 Potable Water System Evaluation
Otay Water Facilities Master Plan Update Page 5-31 2024
■Replacement: Replacement of aging pipelines in the 640 zone with a new 8-inch water line to
improve fire flows in the area between Kempton Street, Grand Avenue, Jamacha Road, and San
Francisco Street. (P2655)
Future System Projects
■Capacity: To serve the Dictionary Hill area with fire flow in emergencies, upgrades to transmission
pipeline in the 1004 zone will be required. (P2407)
■System Reliability: The existing 1050 hydropnuematic pump station will need to be improved to
maintain service reliability. (P2393)
■Replacement: The County of San Diego is planning to replace the Quarry Road Bridge that will
require the District to relocate the existing 16-inch potable water line in this area. (P2611)
5.4.2 Hillsdale System
The Hillsdale water system is nearly built-out and the water system operates with four pumped zones
(803, 860, 978, and 1200). There are no capacity projects required throughout the system as demands are
forecasted to change very little and the system is properly designed and operated. However, should the
District wish to change to a 16-hour refilling of maximum day demands for its operating strategy for pump
stations and reservoirs, the 978 zone will be slightly under capacity. The far eastern area of the water
system, particularly the 803 zone, has relatively low demand and is isolated which causes water to age
considerably and can create water quality maintenance challenges.
It is recommended that the District consider a second 978 PS to be located at the 2.1 MG 803-3 reservoir
to reduce age of water to the east and serve as a redundant water pump station for the 978 zone currently
served from the west by one pump station. The District’s long dead-end pipeline to the east in Dehesa
Road will continue to be a challenge to maintain water quality until an alternate supply connection to the
east can be made. A summary of CIP needs therefore include:
Existing System Projects
■Water Quality/Capacity: Construction of a new 978-2 PS, preliminarily sized at 1,500 gpm, co-
located at the 803-3 reservoir site to provide redundant supply to the 978 zone. This will also
improve turnover of the 803-3 reservoir and, therefore by association, water quality in the 803
zone system to the east of the reservoir, particularly the dead end pipeline in Dehesa Road.
(P2256)
■Water Quality/Water Supply: An interconnection to the Padre Dam MWD water system,
extended northward from the dead end 803 zone 16-inch line in Dehesa Road. This could be used
under emergency situations only or as a two-way normal connection which would improve water
quality in this isolated region. (P2500)
■Replacement: Completion of the replacement of remaining sections of pre-1960’s era thin-walled
steel pipeline. Portions of the pipelines of this material have already been completed, with the
remaining sections along Vista Grande and Pence Drive in the 803 and 978 zones to be replaced.
(P2615, P2616)
■Renovation: Repairs and replacement of pipe supports of the 20-inch steel pipeline supported
from the Steele Canyon Road bridge spanning the Sweetwater River due to localized corrosion.
(P2687)
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Otay Water Facilities Master Plan Update Page 5-32 2024
Future System Projects
■ Water Supply: An emergency interconnection to the Helix WD on Chase Avenue which could
serve the 978 zone in an emergency. (P2517)
5.4.3 Regulatory System
The Regulatory water system is typically a low density service area and is approaching build-out, although
there are a few areas of infill development anticipated. The system consists of several pumped zones (832,
944, 1090, 1296, 1485, 1530 and 1655) and a reduced zone (932). Several of the pumped zones are in
series (832, 944 and 1296) moving water from the west and the border with the Hillsdale zone to the
Jamul area in the east where much of the demand in the system resides.
Water demands are projected to increase slightly in this system. The most significant development could
be for the eventual connection of the North District to the South District via Proctor Valley Road through
the future proposed Village 14 project, which involves a consolidation of planned residential units from
Villages 16 and 19 that are part of the approved Otay Ranch General Development Plan. These former
units will be “clustered” and shifted to Village 14. Villages 16 and 19 will be left as open space and will not
require water service. Only the higher elevations of Village 14 would be served by the Regulatory System
and typically be supplied from the South District. The lower elevations of Village 14 would be served by
an expansion of water facilities from the Central 980 zone through Proctor Valley and is discussed under
the Central System below.
Previous water master plans for the District have included a fourth 1296 reservoir to provide increased
emergency water storage and to serve as a terminal reservoir under an operating scenario where the
South and North Districts are interconnected through Proctor Valley. As presented in the last master plan
update, this interconnect supply concept is based on providing the ability to transfer approximately 3,000
gpm in either direction (North to South or South to North). Based on the modeling, the water system
performs well with few capacity related recommendations found. The primary conveyance needs are to
move water during off peak pumping and/or reliability needs between pressure zones. The closed 1655
zone will be better served by a new small reservoir. A summary of CIP needs include:
Existing System Projects
■ Operations: The District is currently planning to add a 0.5 MG reservoir to the 1655 zone to change
it from a closed zone to an open zone and replace piping in Presilla Drive to handle the increased
system pressure. (P2040, P2681)
■ Replacement: The Vista Diego Hydropneumatic pump station is currently in design for a higher
capacity replacement facility that includes piping upgrades to provide increased fire flow capacity
to the area. (P2639, P2680)
■ Replacement: Install 20-inch pipeline along Proctor Valley Road from Pioneer Way to Campo Road
to replace failing 1960’s era piping. Size reflects future North-South interconnection flows.
(P2058, P2171)
■ System Reliability: Install a 16-inch and 12-inch pipeline in Jefferson Road and Lyons Valley Road
between Campo Road and Jamul Drive to replace failing 1960’s era piping and provide an
additional transmission path to the northern edge of the 1296 zone. (P2693)
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Otay Water Facilities Master Plan Update Page 5-33 2024
■ Operations: Replace aging 1960’s era piping and install portable trailer pump connections at the
1485-2 pump station. (P2692)
Future System Projects
■ System Reliability: Install a 12-inch pipeline along Olive Vista Drive from Ma Lou Drive to
Kemberly Lane that will connect dead end pipelines in the 1485 zone. (P2156)
■ Operations: Upgrade the Rancho Jamul pump station (1655-1 PS) after conversion to an open
system from hydropneumatic operation. (P2642)
■ Operations: Upgrade the 832-2 pump station pumps to allow for drawing suction from the 640
zone rather than the 520 zone to reduce energy consumption. (P2658)
■ Capital Facility: The Village 14 development along Proctor Valley Road will be required to build
storage to serve operational, emergency and fire flow storage to its customers. The 1296-4
reservoir is projected at 2 MG of storage (upsized from developer’s 1.3. MG required storage).
The reservoir is connected to the 1296 system backbone by a 16-inch pipeline (upsized from
developer’s 12-inch pipeline). (P2142, P2591)
■ Capital Facility/District Reliability: The Village 14 development along Proctor Valley Road will be
required to construct pumping and transmission capacity from the 980 zone in the south along
Proctor Valley Road all the way to the 1296 zone in the north to provide two sources of supply to
serve the development. The District can access additional transmission capacity to facilitate
conveyance of water from south to north through this pipeline. Accordingly, the size of this line is
20-inch (upsized from developer’s 12-inch pipeline for P2181) to accomplish that purpose. The
Proctor Valley PS (P2002) is upsized from the developer’s pumping rate of 1,055 gpm to 4,000
gpm. (P2002, P2181, P2203, P2204)
■ System Reliability: Install a 12-inch pipeline in Olive Vista to Presilla Drive to provide an additional
transmission path to the eastern edge of the District in the 1296 zone. (P2033)
■ Capacity: Existing 8-inch and 10-inch pipelines in Jamul Drive should be replaced with a 12-inch
pipeline to allow for capacity to the northern edge of the 1296 zone. (P2056)
■ Capacity/System Reliability/Replacement: A series of pump station, pipeline and PRS projects
have been recommended to provide transmission system upgrades to the series pumping system
used in the Regulatory System (832 to 944 to 1296) which would allow the transmission of large
quantities of flow from the La Presa and Hillsdale Systems to the Regulatory System and vice versa
through PRS upgrades. Additionally, pipeline failures have been experienced along the existing
series pumping system and this transmission system will need to be replaced as the existing one
reaches its useful life. (P2053, P2188, P2195, P2196, P2197, P2198, P2202, P2248, P2379, P2411,
P2412, P2586)
5.4.4 Central Area System
The Central Area water system has substantial growth remaining primarily in eastern Chula Vista and
unincorporated areas in the County. Water demands are projected to increase nearly 50 percent in this
area, which already serves the largest water system by demand in the District.
Chapter 5 Potable Water System Evaluation
Otay Water Facilities Master Plan Update Page 5-34 2024
The most significant new development will be the build-out of the southern portion of Otay Ranch along
the SR 125 , including Villages 4, 8, 9 and 10, and the City of Chula Vista’s University site. Within the current
Otay Ranch area, the District will see continued development of Villages 2 and 3. Village 13 (the Resort
Parcel) and Village 14, located east and north of Lower Otay Reservoir in the County of San Diego, are
moving through the entitlement process. As part of their development planning, each project will require
major extensions of District water facilities, including the construction of water storage facilities.
The District requires the preparation of individual project water studies, known as Subarea Master Plans
(SAMPs), to document onsite and offsite facilities that are required to serve developments. For the Otay
Ranch area, completed SAMPs were reviewed and the backbone facilities proposed in the SAMPs were
incorporated into the InfoWater model and evaluated from an overall Central system planning need.
Based on the InfoWater modeling, the water system generally performs well with some minor capacity
constraints. The primary transmission projects will be completed concurrent with development projects
in the south Otay Ranch area. Increased water storage in the 980 zone is a high priority due to existing
system deficiencies. The 711 zone would benefit from the upgrade of the existing 711-1 PS to provide
more efficient operations and restore lost capacity from the downsizing of the station in 2011. This master
plan recommends the District include a new 624 zone transmission main from the existing Otay Mesa
interconnect pipeline to serve the most southerly reaches of Villages 8, 9 and 10. This will eventually
complete a looped supply of the southern portion of the 624 zone and reduce future occurrences of
pumping water to the 711 zone and then feeding back down to the 624 zone.
A summary of the Central System major CIP needs are described below:
Existing System Projects
■ Capacity: Due to pump suction issues, pumps at the 711-1 pump station were downrated to
10,000 gpm from 16,000 gpm in 2011 and as a result the 711 zone is forecasted to have a capacity
deficiency in the future. It is recommended that the station assess and implement pump suction
revisions to increase the station capacity to 14,000 gpm. (P2578)
■ System Reliability: To address aging electronics and mechanical equipment, the 980-2 pump
station is recommended to replace existing pump motors and motor control centers. (P2676)
■ Replacement: Utilities will be relocated with the replacement of the Heritage Road Bridge over
the Otay River in the 380 zone. (P2553)
■ System Reliability: Associated with the replacement of the Heritage Road Bridge, a PRS at
Heritage Road/Main Street will provide a redundant supply to the 380 zone to customers south
of Otay River from the 624 zone. (P2405)
■ Capital Facility: Developer to install 624 zone 16-inch pipelines (upsized from a 12-inch line) in
Heritage Road and Main Street to serve Village 3 West. (2596)
■ System Reliability: The City of San Diego is replacing their Otay 2nd pipeline through Chula Vista
where the District has two existing emergency interconnections that will require replacement.
(P2691)
Chapter 5 Potable Water System Evaluation
Otay Water Facilities Master Plan Update Page 5-35 2024
Future System Projects
■ System Reliability: A PRS at Energy Way/Nirvana Avenue will provide supply to the 380 zone from
the 624 zone from the east, which will take transmission demand off of the existing pipeline and
PRS on Brandywine Avenue and eliminate the need for a pipeline project at that location. (P2554)
■ Capital Facility: The Village 13 development along Otay Lakes Road will be required to build
storage to serve operational, emergency and fire flow storage to its customers. The 980-3
reservoir is projected at 4 MG, upsized from developer’s 2 MG required storage. (P2037)
■ Capital Facility: The Village 13 development will be required to build transmission capacity from
the 980 zone along Otay Lakes Road and to the proposed 980-3 reservoir to provide supply to
serve its customers, with dual pipelines proposed redundancy to ensure reliability. A 16-inch
pipeline, along with the projected developer required 12-inch line, is planned to provide regional
transmission of water to/from the reservoir. (P2135, P2137, P2138)
■ Capital Facility: In order to serve the 711 zone portions of the development of Villages 8, 9 and
10, a series of 12-inch and 16-inch transmission pipelines (upsized from 8-inch and 12-inch
respectively) will need to be built primarily by the developers in existing and planned roads along
the northern border of the developments in Hunte Parkway. (P2107, P2116)
■ Capital Facility: In order to support development of the 624 zone in the southern portions of Otay
Ranch, and maximize gravity supply, it is recommended that a 20-inch pipeline off of the Otay
Mesa Interconnect be constructed to provide a looped service for the 624 zone. (P2583)
■ Capital Facility: In order to serve Villages 3, 4, 8, 9 and 10 in the 624 zone, the developers will
primarily be constructing a series of 16-inch and 20-inch transmission pipelines on the 624 zone
along what is planned to be Main Street and Otay Valley Road, with a majority of the pipelines
an upsize above the projected individual developments needs of 12-inch piping.(P2402, P2404,
P2590, P2598, P2599, P2600)
■ Capital Facility: Proposed bridges on Main Street and Otay Valley Road that will cross Wolf Canyon
and SR 125 will not be constructed by the developers in this area, but the extension of the water
lines in these structures will be the responsibility of the developers. The developer required water
lines are projected at 8 to 12-inch piping, with the District to upsize these lines to 16-inch for
additional transmission capacity. Costs for the base 12-inch water lines on the SR 125 bridges
(P2602 and P2603) are planned to be divided evenly between the developers of Village 8 East and
Village 9. For the water line on the Wolf Canyon bridge (P2597), the costs of the pre-upsized piping
is to be split between the developers of Village 3 North (75%) and Village 4 (25%) based upon the
estimated portion of the project on their respective properties. (P2597, P2602, P2603)
■ Capital Facility: The Village 14 development along Proctor Valley Road will be required to build
the 980-5 reservoir to provide storage to serve operational, emergency and fire flow storage to
its customers if a single pipeline along Proctor Valley Road is constructed. The reservoir is
projected to be 2.0 MG, an upsize of the estimated required developer needed 1.3 MG. (P2576)
■ Capital Facility/District Reliability: The Village 14 development along Proctor Valley Road will be
required to build transmission capacity from the 980 zone in the south along Proctor Valley Road
to the Proctor Valley (1296-2) Pump Station. The District can access additional transmission
capacity to facilitate conveyance of water from south to north through this pipeline and has
placed the size of this line at a 20-inch to accomplish that, an upsize from the projected developer
required 12-inch pipeline. (P2430, P2435)
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Otay Water Facilities Master Plan Update Page 5-36 2024
■ Capacity: Installation of 16-inch pipeline in East Palomar Street between Medical Center and
Raven in the 458 zone. (P2150)
■ Capacity: Replace and upsize existing 16-inch pipeline on Paseo Ladera between Telegraph and
Olympic to 20-inch in the 624 zone. (P2398)
■ Storage/Replacement: It is recommended that the District build a new 980-4 storage reservoir at
the existing 980 reservoir site to address storage deficit in the 980 zone. Capacity is initially
projected at 3 MG but will be reassessed based on the timing of development and availability of
additional storage therein. (P2431)
■ Storage/Replacement: Future demands on the 711 zone will require additional storage. It is
recommended that the District build a new replacement 711-4 storage reservoir at the existing
711-1 reservoir site to address storage deficit. (P2701)
■ System Reliability: It is recommended that a 12-inch 711 zone looped pipeline be constructed
from Olympic Parkway into the Olympic Training Center area as there is currently no supply
redundancy. (P2122)
■ Capacity: The 980 zone is forecasted to have a significant pumping capacity deficiency in the
future from the projected growth. An expansion to the existing 980-2 pump station from 12,000
gpm to 16,000 gpm is recommended to address the lack of capacity to serve future demands.
(P2577)
■ System Reliability: The 980/711 PRS at Proctor Valley Road/Mount Miguel Road requires
renovation including pipe replacement and electrical upgrades. (P2685)
■ System Reliability: It is recommended that a redundant 30-inch 980 zone pipeline be constructed
from Hunte Parkway to the 980 Reservoirs as there is currently only one main connecting to the
sole zone storage. (P2705)
■ Capital Facility: Developer to install a 624 zone 16-inch pipeline (potentially upsized from a 12-
inch line) in Santa Victoria Road between Olympic Parkway and Heritage Road to serve Village 2
West. (P2581)
■ Capacity: Upsize the existing 711 zone pipeline in Eastlake Parkway between Olympic Parkway
and Birch Road to a 20-inch line. (P2582)
■ Operations: A 30-inch manifold pipeline between the 624-1 / 624-3 reservoir site and the 624-2
reservoir site will improve the ability of the three reservoirs to float together. (P2528)
■ Storage: Because the Otay Mesa Conveyance and Disinfection System Project or OMCDSP
construction is unlikely, a new emergency 30 MG reservoir south of the existing 624 zone reservoir
site should be assessed and constructed to provide additional storage for an outage or emergency
scenario. The volume of 30 MG was recommended in the 2015 WFMP and should be reassessed
as demands and options change. (P2235)
■ Capital Facility: Construction of the 624-4 reservoir Disinfection Facility should accompany the
624-4 reservoir to manage water quality in the 624-4 reservoir and provide chlorination capability
to South District water. (P2437)
■ Water Supply: Should the District desire to establish a connection with the Sweetwater Authority
at Corral Canyon for the transmission of potable water originating from the Perdue WTP to the
Chapter 5 Potable Water System Evaluation
Otay Water Facilities Master Plan Update Page 5-37 2024
Central Area, a 10,000 gpm pump station and 30-inch pipeline to the 624 storage reservoirs is
recommended . (P2391, P2511)
■ Water Supply: Should the District desire to establish a normal supply connection to the City of
San Diego’s Otay Water Treatment Plant, a permanent LOPS Facility should be constructed,
potentially in two phases. (P2392)
5.4.5 Otay Mesa System
The Otay Mesa water system has potential growth in an unincorporated area of the County, known as the
East Otay Mesa Specific Plan area. Additionally, the new third Border Crossing in this area will likely drive
industrial and commercial development in the area. The major planned developments include Otay
Crossings, Hawano, Otay Business Park and Sunroad. Residential development along the western
boundary of the District, in the City of San Diego, is programmed as part of the Otay Mesa Community
Plan update. High density development is proposed along the Siempre Viva Road corridor.
The District’s water system in Otay Mesa has a well-developed backbone that is oversized due to its former
days as an agricultural center. The entire area is operated on the 870 pressure zone. Capacity
improvements are limited to additional storage to provide redundancy and meet 2050 demands, while
new transmission and distribution facilities to support the system are not required. The large majority of
new facilities planned in the Otay Mesa System are those that will be required to serve individual
developments and will therefore be built by developers.
A summary of the Otay Mesa System major CIP needs are described below:
Existing System Projects
■ Operations: It is recommended that the District demolish the existing Otay River Trestle pipeline
previously abandoned but remaining in place due to it also carrying a high pressure gas line
serving the 870-1 pump station. SDG&E has now abandoned this gas line for the project to move
forward. (P2460)
■ Capital Facility: Currently the District moves water from the 571 reservoir to the 870 reservoir
using a low-head, high-head series pumping configuration. This combination is operationally
difficult and inefficient. The 571-1 and 870-1 pump stations are replaced by the 870-2 pump
station which lifts flow all the way from the 571 reservoir to the 870 reservoirs. (P2083)
■ Storage: A new 870-2 storage reservoir near the existing 870-1 reservoir site is recommended to
provide redundant storage for the zone and to allow for the replacement of the liner and cover
of the 870-1 reservoir to be completed. With the anticipated growth in that zone, additional
storage will be needed for Phase II. Thus this reservoir is recommended at a 3.4 MG capacity.
(P2228)
Future System Projects
■ System Reliability: It is recommended that a 12-inch pipeline in Cactus Road north of Airway Road
be replaced with a higher pressure rating line. (P2665)
System Reliability: The seismic vault on the 870 zone pipeline at the 870-2 pump station site
requires renovation including pipe replacement. (P2686)Capital Facility: The construction of 24-inch
pipeline replacements for existing aging lines near the Donovan Prison facility in east Otay Mesa,
west of Alta Road is recommended. (P2589, P2702)
Otay Water Facilities Master Plan Update
Page 6-2
Otay Water Facilities Master Plan Update Page 6-1
2024
Chapter 6
RECYCLED WATER SYSTEM EVALUATION
6.1 Overview/Summary
The State of California periodically experiences water supply crises due to multi-year
droughts. Uncertainties that affect California’s water resources, which in turn impact supplies
to Southern California, receive widespread media coverage and public attention, particularly
as droughts begin to span multiple years, impacting water supply availability with shrinking
allocations. In terms of local water supply opportunities, the District continues to expand its
recycled water system, primarily in the central service area as major land development in the
Otay Ranch area has continued. Because of the availability of land and planned growth, the
District’s recycled water system is one of the largest in San Diego County.
The District’s existing recycled water system provides the District with a local and reliable
supply of irrigation water for the central service area. This chapter provides a description of
the District’s existing recycled water supply and distribution system and addresses potential
areas of expansion and non- expansion. A hydraulic analysis of the existing and proposed
recycled water transmission and distribution systems is also presented that identifies existing
system deficiencies and recommends critical expansion projects.
6.2 Recycled Water Supply
The District has two sources of recycled water supply: the District’s Ralph W. Chapman Water
Reclamation Facility (RWCWRF) and the City of San Diego’s South Bay Water Reclamation
Plant (SBWRP). These facilities are shown on the recycled water vicinity map included in
Figure 6-1.
6.2.1 District Supply
The District owns and operates the RWCWRF, formerly known as the Jamacha Basin Water
Reclamation Facility. The RWCWRF is located near the intersection of Campo Road/Highway
94 and Singer Lane within the Middle Sweetwater River basin. The RWCWRF was originally
constructed in 1979 and upgraded in 1990 and again in 2013. It has a rated design capacity of
1.3 MGD.
Wastewater collection services within the Middle Sweetwater River basin, known as the
Jamacha Basin, are provided by the District and the County. Current wastewater collection
system flows for both agencies run at approximately 1.6 MGD average dry weather flow
(ADWF). In 2010, wastewater flows were 25 percent higher, totaling approximately 1.95
MGD, but have decreased due to water conservation and economic factors. Currently,
approximately two thirds of the basin are District customers and the remaining third County
customers. The RWCWRF is a scalping treatment facility meaning that wastewater that is not
diverted to the plant continues to flow to the County’s Spring Valley Interceptor and to the
Metro wastewater system. The District typically does not treat the County portion of the basin
to maintain adequate downstream flows in the collection system as waste solids from
RWCWRF are returned to the sewer
Otay Water Facilities Master Plan Update
Page 6-2 2024
Chapter 6 Recycled Water System Evaluation
6.2 Recycled Water Supply
Figure 6-1 Recycled Water Vicinity Map
Chapter 6 Recycled Water System Evaluation
6.2 Recycled Water Supply
2024
Otay Water Facilities Master Plan Update Page 6-3
The District typically maximizes recycled water production from the RWCWRF and over the past several
years can consistently supply up to 1.0 MGD of recycled water supply delivered to the District’s Use Area
recycled storage ponds. Because of the continued reduction of District sewer flows, and limited potential
for growth in the basin, a reliable recycled water supply of up to 1.0 MGD is assumed from the RWCWRF.
6.2.2 South Bay Water Reclamation Plant Supply
Metro owns and operates a recycled water treatment plant known as the South Bay Water Reclamation
Plant (SBWRP). The SBWRP has a rated capacity of 15 MGD and is located at Monument and Dairy Mart
Roads near the international border, adjacent to the Tijuana River. The SBWRP receives wastewater flow
from a pump station known as the Grove Avenue pump station that scalps flow from the existing Metro
interceptor system that conveys flow northward to the Point Loma Treatment Plant for treatment and
ocean outfall disposal. The SBWRP currently operates as a scalping plant depending upon recycled water
demands, wastewater interceptor capacity limitations, and plant operations. Updates to the facilities UV
disinfection system in 2020 are reflected in their latest permit R9-2021-0015.
The agreement between the District and the City of San Diego for purchase of recycled water from the
SBWRP was finalized on October 20, 2003. In accordance with the agreement, the City of San Diego will
provide an annual amount of up to 6 MGD on a daily basis of recycled water to the District. The term of
the agreement is 20 years from January 1, 2007. With the expiration of the agreement approaching, the
District has begun the renegotiation of obtaining supply from the SBWRP. It does not appear likely that
the maximum available supply will change from the current 6 MGD although it is not clear how the
implementation of the City’s Pure Water program and secondary equivalency for Point Loma WWTP will
impact future utilization of SBWRP. The District should plan for any future peak demands exceeding the
combined SBWRP and RWCWRF supplies to be met by available storage and potable water
supplementation. Should the City make more than 6 MGD available in the future, the existing distribution
system has the capacity to handle this increased supply.
The City has agreed to meet all applicable federal, state and local health and water quality requirements
for recycled water produced at the SBWRP to the point of delivery. The recycled water total dissolved
solids (TDS) are not to exceed 1,000 mg/L. From the point of delivery, District is responsible for all
distribution facilities that it owns and operates and for the quality of the recycled water from that point.
The point of delivery is located at a meter vault on Dairy Mart Road just north of the SBWRP. The District
funded and constructed a 30-inch transmission main to deliver the recycled water from the point of
delivery to the 450-1 reservoir site. The City of San Diego has retained 1 MGD of capacity in this
transmission pipeline for reuse in the South San Diego area.
A Master Reclamation Permit (Order R9-2007-0038) allows the District to distribute the blended recycled
water supply from the RWCWRF and the SBWRP, but also restricts the areas where recycled water can be
used within the District based on the local surface and groundwater beneficial uses and water quality
objectives of the hydrologic areas that overlay the District’s boundaries. These hydrologic areas are shown
in Figure 6-2.
The current permit allows recycled water use at sites located in the following Hydrographic Areas (HA)
and Hydrographic Subareas (HSA): Telegraph HSA, La Nacion/Sweetwater River HSA, the Salt Creek
portion of Otay Valley HA, and Tijuana Valley HA. Recycled water is not permitted in the Sweetwater
Chapter 6 Recycled Water System Evaluation
6.2 Recycled Water Supply
2024
Otay Water Facilities Master Plan Update Page 6-4
Reservoir drainage basin, where the RWCWF is located, due to the reservoir serving as a drinking water
source for the Sweetwater authority.
In November 2015, the City of San Diego modified the wholesale pricing structure for retail agencies
supplied by the City of San Diego, based on a City-wide cost of service study. The adopted rate structure
for wholesale recycled water pricing, is based on a “postage stamp” methodology which treats the entire
City of San Diego recycled water system as one system, even though two water reclamation plants serve
two geographically separated service areas. The north San Diego recycled water retail agencies benefit
from a lower wholesale cost under the blended rate structure and the south San Diego agencies are hit
with higher recycled water costs.
Otay Water Facilities Master Plan Update
Page 6-5
2024
Chapter 6 Recycled Water System Evaluation
6.2 Recycled Water Supply
Figure 6-2 Hydrologic Subarea
Chapter 6 Recycled Water System Evaluation
6.2 Recycled Water Supply
Otay Water Facilities Master Plan Update
Page 6-6 2024
6.2.3 Summary of Existing Recycled Water Supply
The maximum available recycled water supply to the District is currently approximately 7.0 MGD, based
on the reliable recycled water supply from the RWCRWF (1.0 MGD) and the City of San Diego SBWRP
agreement capacity (6.0 MGD). During a peak day demand exceeding 7 MGD, the District must rely on
storage ponds and/or supplement with potable make-up water. Table 6-1 and Figure 6-3 summarize the
annual recycled water supply history since the District started taking supply from SBWRP in 2007. In 2020,
the SBWRP was out of service for half the year requiring significant potable supplement.
Table 6-1 Recycled Water Supply – 2007 to 2022
Year
Potable Supplement RWCWRF SBWRP Total
AFY MGD AFY MGD AFY MGD AFY MGD
2007 714 0.6 1,206 1.1 2,759 2.5 4,679 4.2
2008 381 0.3 1,202 1.1 3,524 3.1 5,107 4.6
2009 447 0.4 772 0.7 3,622 3.2 4,842 4.3
2010 232 0.2 1,033 0.9 2,751 2.5 4,016 3.6
2011 132 0.1 1,077 1.0 2,805 2.5 4,014 3.6
2012 41 0.0 653 0.6 3,474 3.1 4,167 3.7
2013 1,180 1.1 3,403 3.0 4,582 4.1
2014 1,062 0.9 3,661 3.3 4,723 4.2
2015 1,026 0.9 2,798 2.5 3,824 3.4
2016 56 0.1 716 0.6 3,172 2.8 3,944 3.5
2017 40 0.0 697 0.6 3,311 3.0 4,047 3.6
2018 67 0.1 958 0.9 3,009 2.7 4,034 3.6
2019 739 0.7 2,600 2.3 3,340 3.0
2020 810 0.7 718 0.6 2,150 1.9 3,678 3.3
2021 92 0.1 828 0.7 3,102 2.8 4,022 3.6
2022 2 0.0 1,031 0.9 2,976 2.7 4,009 3.6
Chapter 6 Recycled Water System Evaluation
6.3 Existing RW System Overview
2024 Otay Water Facilities Master Plan Update
Page 6-7
Recycled Water Supply
6,000
5,000
4,000
3,000
2,000
1,000
0
RWCWRF SBWRP Supplemental
Figure 6-3 Recycled Water Supply – 2007 to 2022
6.3 Existing RW System Overview
The District operates and maintains over 90 miles of recycled water transmission and distribution
pipelines, pump stations and reservoirs, making it one of the largest recycled water systems in San Diego
County. The District’s mandatory reuse ordinance, land development conditions, and public outreach has
resulted in a stakeholder acceptance of recycled water as a viable local water supply for irrigation,
especially during recent drought conditions. The District continues to successfully serve recycled water to
customers within its central service area, south of the Sweetwater Reservoir and west of the Otay Lakes
Reservoirs. The majority of the area represents the Otay Ranch General Development Plan area within
the City of Chula Vista.
The District’s recycled water system is unique with a south and north supply, covering a major topography
change. A plan view map and a hydraulic profile of the existing recycled water system is provided in
Appendix A, Exhibits VII and VIII, respectively.
6.3.1 RW Distribution System Summary
To serve the District’s recycled water customers, recycled water supply is provided by both the RWCWRF
and the SBWRP. Title 22 effluent from the RWCWRF is pumped 3.4 miles to the District’s Use Area to two,
lined and covered reservoirs, the 12-MG 944-1 (Pond No. 1) and the 16.3-MG 927-1 (Pond No. 4). Because
these storage facilities are lined and covered, there are no odor control or vector control issues associated
with these facilities, nor is there any percolation of recycled water from these facilities into the
groundwater basin.
To
t
a
l
S
u
p
p
l
y
A
F
Y
Chapter 6 Recycled Water System Evaluation
6.3 Existing RW System Overview
2024 Otay Water Facilities Master Plan Update Page 6-8
A 14-inch diameter force main, originating from the RWCWRF, connects to a junction box at a high point,
nearly 3 miles to the south and then gravity flows to the Districts storage ponds/reservoirs in the Use
Area.
The 927-1 and 944-1 reservoirs have high water elevations of 927 and 944 respectively, and provide
operational and emergency storage for the District’s recycled water system.
The reservoirs are hydraulically connected via a PRV whereby the distribution system will “float” off of
the 927 zone, when the 944 PS is off. Because of these elevation differences, the zone can operate at two
different hydraulic elevations, as follows:
■“944 Zone” pump station is on
■“927 Zone” pump station is off
Accordingly, existing customers may experience pressure swings of 10-20 psi depending on the pump
station status.
A 20-inch recycled transmission main (944/927 zone) extends south from the two reservoirs
approximately 13,000 feet to Otay Lakes Road. Additional 944/927 zone transmission mains exist in Otay
Lakes Road, Telegraph Canyon Road, Eastlake Parkway, Hunte Parkway, East H Street and Olympic
Parkway to supply the system during peak demand or supply the reservoirs during tank filling operations.
A 944/680 PRS located along Otay Lakes Road provides the 680 zone access to the storage in the 944/927
zone during high demand periods.
The majority of the recycled water supply to the existing system originates in the south at the SBWRP. A
30-inch transmission main (450 zone) extends from the City’s SBWRP and recycled water pump station to
the 12 MG, 450-1 reservoir. This reservoir functions primarily as a regulating reservoir and forebay for the
680R-1 PS, which provides recycled water to the 680 and 944/927 zones within the central area. The
680R-1 PS (firm capacity of 6,300 gpm) is located at the 450-1 reservoir site and pumps recycled water via
16-inch/20-inch/30-inch transmission mains, primarily within Olympic Parkway, to the 680-1 reservoir.
The 3.4 MG, 680-1 reservoir was constructed beneath the basketball courts at Sunset View Park in Chula
Vista. The adjacent 944R-1 PS, with a firm capacity of 4,920 gpm conveys water from the 680 zone to the
944/927 zone, via 16-inch/20-inch/24-inch transmission mains.
The District has made upgrades to the 944/927 zone due to areas of excessive operating pressures which
caused problems with service laterals and connections. In the northern part of the zone, two isolated
pressure reducing zones were created by constructing PRVs. A 780 zone was created just east of Hunte
Parkway and south of Otay Lakes Road, and a 675 zone to the north (renamed from 680 to avoid
confusion with the larger 680 zone, to which it is not connected, and more closely reflect the PRS setting),
just west of SR-125 and north of H Street.
In the south, because of lowering topography and areas of high service pressures, a new 815 zone was
created by constructing two PRVs near Eastlake Parkway and Olympic Parkway. This zone will be expanded
further south as areas of the Otay Ranch development villages proceed with construction.
A summary of the recycled water pressure zones is provided in Table 6-2.
Chapter 6 Recycled Water System Evaluation
6.3 Existing RW System Overview
2024 Otay Water Facilities Master Plan Update Page 6-9
Table 6-2 Recycled Water Pressure Zones
Service Elevation (feet)
Pressure Zone Minimum Maximum Supply Source Open/Closed
450 N/A N/A SBWRP Open
675 210 500 944/675 PRS Closed
680 200 560 680-1R PS, 944/680 PRS Open
750 484 623 944/750 PRS Closed
780 512 600 944/780 PRS Closed
815 440 664 944/815 PRSs Closed
944/927 454 752 944-1R PS, RWCWRF Open
6.3.2 RW Storage Reservoirs
There are four recycled water storage reservoirs as summarized below in Table 6-3. Reservoir 450-1 serves
as short term storage for the recycled water obtained from SBWRP as well as providing a supply to the
City of San Diego’s customers located along that water supply line to the District and acting as a forebay
for the 680R-1 PS. The 680-1 Reservoir primarily serves as the forebay for the 944R-1 PS, but does provide
some storage to the 680 zone.
Table 6-3 Recycled Water Storage Reservoirs
Pressure Zone Reservoir Capacity (MG) High Water Level (feet) Year Built Material
450 450-1 12.0 450 2007 Steel
680 680-1 3.4 680 2004 Concrete
944/927 927-1 16.3 927 1993 Earth Embank
944-1 12.0 944 1993 Earth Embank
Total 43.7
6.3.3 RW Pump Stations
The three recycled water pump stations operated by the District are presented in Table 6-4 below. The
680R-1 and 944R-1 pump stations are for transferring recycled water from the SBWRP to the primary
system storage in the 944/927 pressure zone and helping to meet peak recycled water demands. Recycled
water from the RWCWRF is conveyed by the Effluent Pump Station located at the plant. This station has
gas and diesel engine driven pumps in addition to electric pumps to allow for continuous operation
without concerns for peak electrical rate times.
Chapter 6 Recycled Water System Evaluation
6.3 Existing RW System Overview
2024 Otay Water Facilities Master Plan Update Page 6-10
Table 6-4 Recycled Water Pump Stations
Pressure Zone Pump Station Duty Pumps Suction Discharge Zone Station Type
Pump Station Capacity
Total Firm
gpm MGD gpm MGD
680 680R-1 4 450-1
Reservoir 680 Elec 8,400 12.10 6,300 9.07
944
944R-1 3 680-1
Reservoir 944 Elec 9,220 13.28 4,920 7.08
RWCWRF
Effluent PS 5 RWCWRF 944 Elec &
Gas/Diesel 3,700 5.33 2,900* 4.18*
*- Note that the discharge from RWCWRF is limited by the treatment process capacity of 1.3 MGD
For 16 hours of operation a day, the firm capacity of the 680R-1 and 944R-1 Pump Stations are 6.05 MGD
and 4.72 MGD respectively, while the total capacity reduces to 8.07 MGD and 8.85 MGD respectively.
Note that the 944R-1 PS can convey 6.5 MGD in 16 hours with using the large pump and one of the smaller
pumps.
6.3.4 RW Pipelines
The District’s recycled water system is comprised of approximately 90 miles of transmission and
distribution piping, ranging in size up to 36-inch diameter. A majority of the piping was installed in the
2000’s when the construction of SBWRP made more recycled water available and several major
developments were completed. Continued growth in Chula Vista will be the primary driver for future
pipeline additions. A summary of the existing pipelines by size and year installed are presented in Tables
6-5 and 6-6, with graphic representations of the data shown in Figures 6-4 and 6-5.
Table 6-5 Recycled Water Piping – Decade of Installation
Decade of Installation Length (FT) Length (Miles)
1970 16,021 3.03
1980 13,688 2.59
1990 88,484 16.76
2000 298,085 56.46
2010 30,551 5.79
2020 32,020 6.06
TOTAL 478,849 90.69
Chapter 6 Recycled Water System Evaluation
6.3 Existing RW System Overview
2024 Otay Water Facilities Master Plan Update Page 6-11
Figure 6-4 Recycled Water Piping – Decade of Installation
Table 6-6 Recycled Water Piping – Diameter
Diameter (IN) Length (FT) Length (Miles)
4 and Less 4,973 0.94
6 92,720 17.56
8 101,915 19.30
10 21,955 4.16
12 62,939 11.92
14 16,325 3.09
16 86,411 16.37
20 58,574 11.09
24 696 0.13
30 32,088 6.08
36 253 0.05
TOTAL 478,850 90.69
2020 2010 2000 1990 1980 1970
350,000
300,000
250,000
200,000
150,000
100,000
50,000
0
RW Piping - Decade of Installation
Le
n
g
t
h
(
f
t
)
Chapter 6 Recycled Water System Evaluation
6.3 Existing RW System Overview
2024 Otay Water Facilities Master Plan Update Page 6-12
Figure 6-5 Recycled Water Piping – Diameter
6.3.5 RW Pressure Reducing Stations
As discussed above under the pressure zones, the District uses a number of pressure reducing stations in
the recycled water system to reduce excessive pressures. The nine PRSs serving the recycled water system
are summarized in Table 6-7.
Table 6-7 Recycled Water Pressure Reducing Stations
Pressure Zone From/To Zones Purpose Location Size (Inch)
675 944/675 Normal Operation Mount Miguel Road 8 & 4
680 815/680 Standby(1)Magdalena Ave 6 & 2
944/680 Standby(2)Otay Lakes Road 12 & 8
750 815/750 Normal Operation East Palomar St 6 & 2
780 815/780 Normal Operation Otay Lakes Road 8 & 4
815 944/815 Normal Operation Eastlake Parkway 8 & 4
944/815 Normal Operation Olympic Parkway 8 & 4
927 944/927(3)Normal Operation Use Area 16
944/927(3)Normal Operation Use Area 16
1.The 815/680 PRS is normally closed and will open to address low pressures in this region during high demands2.Normal operation for the 944/680 is closed, but it opens when a set low storage in the 680-1 reservoir is reached3.See earlier discussion of 944/927 zone operation
Pipe Size (inch)
8 10 12 14 16 20 24 30 36 6 4 and Less
120,000
100,000
80,000
60,000
40,000
20,000
0
RW Piping - Diameter
Le
n
g
t
h
(
f
t
)
Chapter 6 Recycled Water System Evaluation
6.4 Future System Overview
Otay Water Facilities Master Plan Update
Page 6-13 2024
6.4 Future System Overview
The District’s Central Area continues to grow as shown on development maps included in Chapter 1. The
District will continue to require developers to expand and connect to the District’s recycled water systems
to serve irrigation demands. The master planned developments typically require irrigation for parks,
schools, commercial and industrial areas and multi-family common areas. Single-family residential units
will not use recycled water due to regulatory restrictions. A large potential irrigation demand also exists
for streetscapes and landscaped manufactured slopes due to large scale grading operations. The
uncertainty of water supply in San Diego County and the recent drought conditions make recycled water
a viable and reliable supply to meet future growth needs primarily within Villages 1 through 11, and the
University site shown on Figure 1-3.
As earlier noted, the District has determined that it is not cost effective to expand and convey recycled
water from the central area to the Otay Mesa area. As a result, developers within Otay Mesa area are no
longer required to construct a recycled water system as part of their site infrastructure.
6.5 Existing Storage and Pumping Analysis
The recycled water system storage and pumping was assessed to determine if criteria was met under
existing demands. Recycled water storage criterion was evaluated at two-thirds of a MDD based upon
current District criteria presented in Chapter 2. The maximum day peaking factor of 2.7 WAS Design
Guidelines Section 4.3, Table 4-3-3 is used to evaluate storage and pump capacity. The resulting storage
assessment is included in Table 6-8.
Based on a MDD of 9.34. MGD and total storage capacity in the system of 43.7 MG, there is over 35 MG
in excess storage capacity in the system. The 680-1 reservoir is currently operated at approximately
50 percent of the total capacity due to low and high water level controls for the operation of the 944R-1
PS. This reduces normal operational storage in the 680 zone by approximately 1.7 MG. The reservoir is
then primarily for the operation of the 944R-1 PS to transfer recycled water to the storage in the 944 zone.
Max day demands in the 680 zone are met with the operation of the 680R-1 PS or by pulling water from
the 944/927 zone through the 944/680 PRS when a set level in the 680-1 reservoir is reached and turning
off the 680R-1 PS. Based on current conditions, the District has adequate operational storage to meet
existing MDD within all the pressure zones.
Table 6-8 Existing Recycled Water Storage Analysis
Pressure Zone Facility ID (Name)
Existing Average Day Demand(1) Max/ Avg PF
Max Day Demand (MDD = ADD x PF) Capacity (MG)
Required Operational Storage per Design Criteria (0.67 x MDD) (MG)
Surplus/ (Deficit) (MG) gpm MGD gpm MGD
450 450-1 18 0.02 2.7 48 0.07 12.0 0.05 12.0
680 680-1(2)730 1.05 2.7 1,971 2.84 3.4 (1.7)(4) 1.90 (0.2)(5)
944(3)944-1
927-1 1,654 2.38 2.7 4,466 6.43 12.0
16.3 4.31 24.0
System Total 2,402 3.45 6,485 9.34 43.7 6.26 35.8
gpm = gallons per minute; MGD = million gallons per day; PF = Peak Flow; MG = million gallons; ADD = average day demand;
MDD = maximum day demand
(1) Includes 5% non-revenue water demand.
(2) Based on current operational levels, the 680 reservoir may not be fully utilized. This analysis assumes full capacity of the
reservoir.
Chapter 6 Recycled Water System Evaluation
6.6 Future 2055 Recycled Water System Analysis
Otay Water Facilities Master Plan Update
Page 6-14 2024
(3) Includes demands for the 675, 750, 780, and 815 reduced zones.
(4) Only 50% available for operational storage based on 944 pump station settings.
(5)Storage in 944/927 zone can supply the 680 zone so no deficit exists.
A recycled water pump station analysis was performed for the District’s facilities only (the SBWRP pump
station was not included as it is owned and operated by the City of San Diego) and the results are
summarized in Table 6-9. The District’s pump stations have adequate pumping capacity to convey SBWRP
recycled water to the 944/927 storage reservoirs over the course of 24-hour pumping operations and
within 16 hours if the 944R-1 PS Pump 3 is available for use.
Table 6-9 Existing Recycled Water Pump Station Analysis
Pump Station Pump Unit
Rated Capacity Firm Capacity Max Supply MGD
Max Supply Pumping(1) Surplus / (Deficit)
gpm MGD gpm MGD 24-Hour (gpm) 16-Hour (gpm) 24-Hour (gpm) 16-Hour (gpm)
680R-1
1 2 3 4
5(3)
2,100 2,100 2,100 2,100 -
3.02 3.02 3.02 3.02 -
6,300 9.07(1)6.0 4,170 6,250 2,130 50
944R-1(2)
1
2 3
2,460
2,460 4,300
3.54
3.54 6.19 4,920 7.08(1)6.0 4,170 6,250 750 (1,330)
RWCWRF
Effluent
1
2(3)
6
5
3
4
800
-
700
800
700
700
1.15
-
1.00
1.15
1.00
1.00
1,600(4) 2.30(4)1.3 904 N/A 696 N/A
gpm = gallons per minute; MGD = million gallons per day
Note: Facilities as of January 2016
(1) 680 and 944 Pump Stations are limited by the City of San Diego supply contract to 6 MGD and by the available storage in
the 450-1 and 680-1 Reservoirs. This limits their hours of operation to less than their firm capacity over 24 hours.
(2) Normal pumping capacity with Pump 3 operating allows for conveying 6 MGD in under 16 hours of operation.
(3) Space provided for an additional pump if needed.
(4) RWCWRF Pump Station operating capacity is limited to the treatment process rate and minimal forebay storage volume.
6.6 Future 2055 Recycled Water System Analysis
The future 2055 recycled water system was evaluated using the InfoWater hydraulic computer model.
The future recycled water system included the ultimate demands for supply, pumping, and storage needs.
Demands were primarily allocated by location of Villages in Otay Ranch, the Central area allowance for
streetscapes and slopes was proportional to the 680 and 815 zones where the majority of the growth will
occur. Proposed transmission mains were added to the existing system hydraulic model based on future
developments and previous ultimate system models.
Based on the hydraulic analysis at peak hour and tank filling, key findings and recommendations are noted
below and serve as a basis for the District’s CIP presented in Chapter 7. Appendix A, Exhibits VII and VIII
present the existing and proposed recycled water system. The following summary of key findings and
recommendations are developed for the District’s CIP presented in Chapter 7:
Chapter 6 Recycled Water System Evaluation
6.6 Future 2055 Recycled Water System Analysis
Otay Water Facilities Master Plan Update
Page 6-15 2024
■Transmission pipeline hydraulic constraints between 680R-1 PS and 944R-1 PS limits pumping
capacities at 680R-1 PS and creates excess energy loss, therefore several transmission main
improvements are recommended along Olympic Parkway and Santa Victoria. (R2080, R2082, and
R2085)
■The City of San Diego has had limitations during the peak summer months on delivering the full 6
MGD of supply, requiring the District to supplement the recycled water supply with potable water.
The District should work with the City of San Diego to ensure recycled water supply obligations
under the terms of the agreement are met.
■The southern portion of Otay Ranch Villages should create several backbone pipeline loops to
maximize recycled water use. Updated CIP projects have been identified in Main Street, La Media
Parkway, Hunte Parkway and through Village 8, 9, and 10. (R2028, R2037, R2038, R2042, R2043,
R2047, R2132, R2133, R2134, R2135)
■Construct a pipeline across the river through a new Heritage Road Bridge planned by the City of
Chula Vista and the pressure reducing station to reduce the pressure from the 680 Pressure Zone
to a new 450 Pressure Zone to serve the amphitheater and water park. The timing of the project
is based upon the construction schedule of the Heritage Road Bridge. (R2079)
■Proposed bridges on Main Street and La Media Parkway that will cross Wolf Canyon and SR 125
will not be constructed by the developers in this area, but the extension of the recycled water
lines in these structures will be the responsibility of the developers. The developer required
recycled water lines are projected at 6-inch piping, with the District to upsize these lines to 8-inch
for additional transmission capacity and flexibility in system pumping. Costs for the base 6-inch
water lines on the SR 125 bridges (R2136 and R2137) are planned to be divided evenly between
the developers of Village 8 East and Village 9. For the recycled water line on the Wolf Canyon
bridge (R2126), the costs of the pre-upsized piping is to be split between the developers of Village
3 North (75%) and Village 4 (25%) based upon the estimated portion of the project on their
respective properties.
■944-1 PS controls limit reservoir operating levels and 680 zone effective storage that an increase
in storage in the 680 zone would reduce or eliminate the need for transferring water from the
944/927 zone down to this zone during periods of high demands. (R2131)
■The ability for the 680 and the 944 PSs to operate economically during peak electrical rate hours
via an alternative power source should be investigated. This could involve such options as solar,
battery storage, a combination of the two, or engine driven pumps. This would provide the District
with flexibility to move recycled water regardless of the time of day. Another option for the 944R-
1 PS is to increase the firm capacity for operating 16 hours a day by replacing and upgrading a
pump. (R2129, R2130)
■The 944R-1 PS would benefit in reduced operating costs, increased system reliability, and
increased pump capacity by reducing the system operating head with the addition of another
transmission water line between Otay Lakes Road and Proctor Valley Road. (R2128)
■It may be beneficial to study alternatives to optimize 944/927 pressure zone hydraulics (i.e.;
eliminate 944R-1 PS on/off pressure zone swings) by dedicating the 944-1 Reservoir (Pond 1) to
the RWCWRF, dedicating the 927-1 Reservoir (Pond 4) to the 944R-1 PS, and/or constructing a
new 927-2 Reservoir in former Pond 2 location, immediately west of Pond 4. Energy could be
Chapter 6 Recycled Water System Evaluation
6.6 Future 2055 Recycled Water System Analysis
Otay Water Facilities Master Plan Update
Page 6-16 2024
saved by pumping from the 680-1 Reservoir to the 927-1 Reservoir rather than the 944-1
Reservoir. The recycled water system can operate with sufficient pressures as a 927 zone.
Chapter 7 includes budgetary costs for these CIPs, however, it is recommended that detailed
preliminary engineering be conducted to thoroughly evaluate each possible option with goal to
optimize service at the lowest capital costs.
Chapter 7 includes the planned recycled water CIPs to correct the above constraints and system
limitations.
Otay Water Facilities Master Plan Update Page 7-1
Chapter 7
RECOMMENDED CAPITAL IMPROVEMENT
PROGRAM
7.1 Overview/Summary
Over the past 20 years, the District has experienced wide fluctuations in growth and water demands due
to economic and drought conditions. The District’s Capital Improvement Program (CIP) must be designed
to respond to these changing conditions, which may result in the need to accelerate water infrastructure
to meet increasing water demand or the flexibility to defer planned projects that may not be needed as
originally forecasted. The significant reduction in water use District-wide associated with the past drought
from water conservation and restrictions has also led to further reassessments and even deferral of CIPs.
This WFMP presents an updated CIP for the District considering reliability of local water supply,
transmission, storage, and pumping projects that may be needed. With the likely return of drought
conditions, the District continues to improve and expand its recycled water facilities to serve irrigation
demands and conserve valuable potable water supplies. Nowhere in San Diego County is this more
pronounced than in eastern Chula Vista and the Otay Ranch General Development Plan area of the
District’s service area.
As in prior water master plans, the WFMP considers three major timelines or phases for the potable water
CIP to ensure near-term high priority projects based on (e,g., regulatory compliance, capacity
constraints, cost-effciency, etc.) are included within the next six year budgeting cycle, as well as long-
term CIPs driven by the timing of future growth. All capacity based CIP’s are sized and based on the
estimated “medium” forecast of water demands presented in Chapter 3.
The proposed Potable Water CIP phases for the WFMP therefore include the following:
■Phase I (Present-2029). These include projects that are currently in the District’s 6 year CIP
program with some in design or under construction. An example of such a project is the Olympic
Parkway Recycled Water Line project under construction. These projects are noted but are not
included in the Program EIR because environmental review has been addressed in previous
documents.
■Phase II (2030-2034). These CIPs typically represent the high priority projects necessary to
address a current water system deficiency and provide backbone infrastructure to support
development projects. These projects are budgeted just outside the current six year revenue cycle
for the District but are included in the current water rate structure and capacity fee program. An
example of such a project is the 832-2 Pump Station project necessary to enable the station to
draw suction from the 640 zone rather than the 520 zone.
■Phase III (2035-2055). These CIPs represent projects that may not be urgent but are critical to
meeting future growth, and water system design criteria and the District has sufficient time to
Otay Water Facilities Master Plan Update Page 7-2 2024
Chapter 7 Recommended Capital Improvement Program 7.2 Expansion, Betterment, Replacement, and Supply Offsets
implement the project. The horizon year for sizing infrastructure is year 2055. These projects
present a long-term CIP that may be used by the District in formulating a 10-year revenue plan.
An example of such a project is the 980-2 pump station expansion project necessary to increase
pumping capacity based on forecasted water demand increases. Also included are CIP projects
that primarily represent system reliability projects necessary to meet SDCWA outages and District
system design criteria. An example of such a project is the 624-4 reservoir in the Central Area.
For recycled water, the CIPs are divided into two major phases of implementation, near term to reflect
current development and system needs and long term system improvements. The proposed Recycled
Water CIP phases for the WFMP therefore include the following:
■ Phase I (Present-2029). CIPs include projects that will be constructed or have been identified as
necessary within the next six years. All of these projects, except for one, are developer
reimbursements to coincide with construction of the developments. These projects will be
budgeted into a six year revenue cycle for the District and included in the recycled water rate
structure and capacity fee program.
■ Phase IIA (2030-2055). These CIPs represent priority projects necessary to provide more flexibility
in conveying recycled water, including the option of operating during all hours of the day,
regardless of peak electrical billing periods, to the District’s primary storage in the 944 pressure
zone. Project options include pump upgrades and the addition of an alternative power source
such as engine-driven pumps, solar, and/or battery storage at the 680R-1 PS and 944R-1 PS are
the primary projects under this phase.
■ Phase IIB (2030-2055). The projects in these CIPs are required to increase the movement of water
within the 680 and 944 pressure zones for meeting peak demands and reduction of hydraulic
headlosses. The new 680 pressure zone pipeline forms a new southern backbone to the recycled
water system through Villages 2 and 7. Portions of this pipeline will be built by developers and
reimbursed as constructed.
■ Phase IIC (2030-2055). These CIPs consist primarily of additional backbone pipelines for serving
new areas of development and new customers beyond the current reach of the system. A majority
of the projects will be developer reimbursements located in the southern Central Area.
Phasing and timing for the recommended CIP projects may be accelerated or deferred as required to
account for changes in supply quantities or sources, development project schedules, availability of land
or right-of-way for construction, project funding limitations, environmental concerns or other
considerations.
7.2 Expansion, Betterment, Replacement, and
Supply Offsets
The WFMP proposed CIP for the District primarily focuses on capacity and expansion related projects
designed to meet the medium growth forecast presented in Chapter 3. Typically the District updates its
water capacity fee program by integrating the updated CIP expansion projects into an update cost of
service study. The WFMP Update following this Draft Update will be used for the cost of service study as
it will include projects reflective of the halt on Village 14 and associated projects and updated costs for
recommended projects.
Chapter 7 Recommended Capital Improvement Program
7.3 Potable Water – Recommended CIP
Otay Water Facilities Master Plan Update Page 7-3 2024
Unique to the District, is a water supply offset fee, which was approved by the Board in 2010, to collect
revenues to fund local water supply projects. Although at this time the WFMP is not proposing a new
water source project by 2055, this could change in the future should reductions in water from existing
sources be enacted or the cost of water increases to levels that make the alternative sources economical.
The offset fee becomes a vehicle to collect additional fees to fund local water supply projects, and offset
future water demands thereby allowing continued expansion and economic growth in the South Bay
region.
The CIP includes District identified replacement projects that were considered in the WFMP analysis. New
replacement projects will be added to the CIP as the District gains a better understanding of the condition
and reparability of existing assets. These projects are typically funded by user rates.
Developer expansion projects have historically been a major contributor to the District’s CIP in part due
to the extensive growth over the past 20 years in eastern Chula Vista. By coordinating with planned
development projects and working with local Developers, the District was able to have designed and
constructed many major water transmission and storage projects. This saved considerable capital costs,
in that most of the CIPs were constructed concurrently with major roadway projects.
Now that the District is approaching build-out, and a large part of the backbone facilities are constructed,
the new CIPs will be reviewed to determine the nexus to remaining development projects and whether
projects should be included as a CIP, upsized by the District, or simply only Developer required.
The upsizing of developer projects listed in Tables 7-1 through 7-4 below are not intended to set
reimbursement amounts. The District will reimburse developers for District directed upsizing of
developer projects based on developer provided actual construction cost data (e.g.; developer bids with
upsize bid as a bid alternative).
7.3 Potable Water – Recommended CIP
The recommended potable water facility improvements are shown in Appendix A, Exhibits I through VI—
one exhibit for each of the District’s five water systems and an overall system hydraulic profile. The
labeling on the exhibits utilize the District’s naming convention, with a “P” listed before the “Project
Identification Number”, i.e. (P1234). The tables provided in this section also list the CIP naming
convention. Chapter 5 includes project descriptions and the drivers for the projects, including: reliability,
rehabilitation/replacement, betterment, capacity, supply and water quality.
Chapter 7 Recommended Capital Improvement Program
7.3 Potable Water – Recommended CIP
Otay Water Facilities Master Plan Update Page 7-4 2024
Table 7-1 Potable Water Storage CIP Projects
Project No. System Project Description Capacity (MG)
Phase I (Present - 2029)
P2040 Regulatory Res - 1655-1 Reservoir - 0.5 MG 0.5
P2228 Otay Mesa Res - 870-2 Reservoir – 3.4 MG 3.4
Total Phase I 3.9
Phase II (2030 - 2034)
P2431 Central Res - 980-4 Reservoir - 3.0 MG 3
P2584 La Presa Res - 657-1 and 657-2 Reservoir Demolitions (reliability) -2
Total Phase II 1.0
Phase III (2035 - Ultimate)
P2142 Regulatory Res - 1296-4 Reservoir, Village 14 - 2.0 MG (Developer
Reimbursable, Upsize from 1 MG)
2
P2037 Central Res - 980-3 Reservoir, Resort Parcel - 4.0 MG (Developer
Reimbursable, Upsize from 1 MG)
4
P2576 Central Res - 980-5 Reservoir, Village 14 - 2.0 MG (Developer
Reimbursable, Upsize from 1 MG)
2
P2701 Central Res – 711-4 Reservoir – 4.3 MG (Replacement for 711-1
Reservoir, Increase from 3.1 MG)
4.3
P2235 Central Res - 624-4 Emergency Reservoir - 30 MG 30
Total Phase III 42.3
Chapter 7 Recommended Capital Improvement Program
7.3 Potable Water – Recommended CIP
Otay Water Facilities Master Plan Update Page 7-5 2024
Table 7-2 Potable Water Pump Station CIP Projects
Project No. System Project Description Capacity (gpm)
Phase I (present - 2029)
P2578 Central PS - 711-1 Upgrade - from 10,000 to 14,000 gpm (1) 14,000
P2676 Central PS – 980-2 Pump Station Motors and MCC Replacements --
P2639 Regulatory PS – Vista Diego Hydropneumatic Pump Station Replacement 1,500
Total Phase I 15,500
Phase II (2030 - 2034)
P2642 Regulatory PS – Rancho Jamul Hydropneumatic Pump Station
Improvements
--
P2658 Regulatory PS – 832-2 Pump Station Modifications --
Total Phase II --
Phase III (2035 - Ultimate) –
P2002 Regulatory PS - 1296 -2 Proctor Valley Pump Station - 4,000 gpm (Developer Reimbursable, upsize from 1,055 gpm) (3)
4,000
P2202 Regulatory PS - 1296-1 Pump Station Expansion - from 2,900 to 6,000 gpm 6,000
P2248 Regulatory PS - 944-1 Pump Station Replacement and Expansion - from 3,000 to 6,000 gpm 6,000
P2379 Regulatory PS - 832-2 Pump Station Expansion - from 4,200 to 6,800 gpm 6,800
P2393 La Presa PS - Pointe Hydro Pump Station Improvements --
P2256 Hillsdale PS - 978-2 Pump Station - 1,500 gpm 1,500
P2577 Central PS - 980-2 Pump Station Expansion - from 12,000 to 16,000
gpm
16,000
P2391 SWA to Central PS - SWA/Central 624-1 Pump Station, 10,000 gpm (2) 10,000
P2392 Central PS -Lower Otay Pump Station Replacement and Expansion -
from 12,500 to 18,000 gpm (2)
18,000
Total Phase III 50,300
(1) Includes suction manifold modifications.
(2) Depending on a potential new water supply (SWA or City of San Diego) one new pump station with
piping is required to convey water to the District. Only one of the two projects (P2391/P2392 and P2511)
would be implemented.
(3) See end of Section 7.2 for details related to “upsize” of developer projects.
Chapter 7 Recommended Capital Improvement Program
7.3 Potable Water – Recommended CIP
Otay Water Facilities Master Plan Update Page 7-6 2024
Table 7-3 Potable Water Pipeline CIP Projects
Project No. System Project Description Length (ft)
Phase I (present - 2029)
P2460 Otay Mesa I.D. 7 Trestle and Pipeline Demolition --
P2405 Central PL - 624/380 PRS, Heritage Road and Main Street --
P2553 Central PL – 16-inch, 380 Zone, Heritage Road Bridge Replacement Utility Relocation 2,700
P2596 Central PL – 16-inch, 624 Zone, Village 3N – Main St, Heritage Rd/Wolf Canyon
(Developer Reimbursable, Upsize from 12-inch)
3,200
P2691 Central City of San Diego – Otay 2nd Pipeline Phase 4 Interconnections Relocations --
P2058 Regulatory PL - 20-inch, 1296 Zone, Proctor Valley Road – Melody/SR-94 1,600
P2171 Regulatory PL - 20-inch, 1296 Zone, Proctor Valley Road - Pioneer/Melody 2,200
P2680 Regulatory PL – 12-inch, 1530 Zone, Vista Diego Rd 400
P2681 Regulatory PL – 12-inch, 1655 Zone, Presilla Drive 1,760
P2692 Regulatory 1485-2 PS Yard Piping Modifications --
P2693 Regulatory PL – 12 & 16-inch, 1296 Zone, Jefferson Rd, Lyons Valley to Jamul 4,200
P2615 Hillsdale PL – 12-inch, 803 Zone, Vista Grande 2,750
P2616 Hillsdale PL – 12-inch, 978 Zone, Pence/Vista Sierra 4,700
P2687 Hillsdale PL – 20-inch, 803 Zone, Steele Canyon Rd Bridge WL Renovation --
Total Phase I 24,710
Phase II (2030 - 2034)
P2195 Regulatory PL - 24-inch, 640 Zone, Campo Road - Regulatory Site/Millar Ranch 4,100
P2196 Regulatory PL - 24-inch, 640 zone, Millar Ranch Road to 832-1 Pump Station 2,200
P2598 Central PL - 16-Inch, 624 Zone, Village 8W – Main St, La Media/Village 4 (Developer
Reimbursable, Upsize from 12-inch)
1,000
P2599 Central PL - 16-Inch, 624 Zone, Village 8W- Otay Valley Rd, School/Village 8E
(Developer Reimbursable, Upsize from 8-inch)
900
P2685 Central 980/711 PRS Renovation – Proctor Valley Rd --
P2665 Otay Mesa PL – 12-inch, 870 Zone, Cactus Rd 1,800
P2686 Otay Mesa 870 Zone Seismic Vault Renovation --
P2516 La Presa PL - 12-Inch, 640 Zone, Jamacha Road - Osage/Elkelton 2,500
P2608 La Presa PL – 8-inch, 850 Zone, Coronado Ave, Chestnut/Apple 1,300
P2655 La Presa PL – 8-inch, 640 Zone, La Presa Pipeline Improvements 1,000
Total Phase II 14,800
P2589 Otay Mesa PL - 24-inch, 870 Zone, Donovan Prison 600
P2702 Otay Mesa PL – 24-inch, 870 Zone, IIP West – North of Lone Star Rd 1,500
P2107 Central PL - 16-Inch, 711 Zone, Village 8E, Rock Mtn Rd – Magdalena/SR 125
(Developer Reimbursable, Upsize from 12-inch)
2,400
P2116 Central PL - 16-Inch, 711 Zone, Hunte Parkway - SR 125/EastLake Parkway (Developer
Reimbursable, Upsize from 12-inch)
3,000
Chapter 7 Recommended Capital Improvement Program
7.3 Potable Water – Recommended CIP
Otay Water Facilities Master Plan Update Page 7-7 2024
Table 7-3 Potable Water Pipeline CIP Projects
Project No. System Project Description Length (ft)
P2122 Central PL – 12-inch, 711 Zone, Training Center Looping 1,200
P2135 Central PL - 16-Inch, 980 Zone, Otay Lakes Road to Village 13 (Developer
Reimbursable, Parallel 12-inch by Developer)
5,500
P2137 Central PL - 16-Inch, 980 Zone, Village 13 to 980-3 Reservoir Transmission PL
(Developer Reimbursable, Parallel 12-inch by Developer)
3,500
P2138 Central PL - 16-Inch, 980 Zone, 980-3 Reservoir Transmission PL (Developer
Reimbursable, Parallel 12-inch by Developer)
2,200
P2150 Central PL - 16-inch, 458 Zone, East Palomar Street - Medical Center/Raven 900
P2398 Central PL - 20-inch, 624 Zone, Paseo Ladera btwn Telegraph/Olympic Upsizing 2,800
P2404 Central PL - 16-Inch, 624 Zone, Village 4 – Main St, Wolf Canyon/Village 8W (Developer Reimbursable, Upsize from 12-inch) 3,600
P2430 Central PL - 20-inch, 980 Zone, Proctor Valley Road – Village 14 Phase 1 (Developer
Reimbursable, Upsize from 12-inch)
8,500
P2435 Central PL - 20-in, 980 Zone, Proctor Valley Road – Village 14 Phase 2 (Developer Reimbursable, Upsize from 12-inch) 6,500
P2437 Central Dis 624-4 Disinfection Facility --
P2511 Central to/from SWA PS – SWA Interconnection, 30-Inch, 624 Zone, Corral Canyon Rd (2) 10,000
P2528 Central PL – 30-inch, 624 Zone, Manifold between Res 624-1 & 624-2 8,000
P2554 Central 624/380 PRS at Energy Way and Nirvana Avenue --
P2581 Central PL - 16-inch, 624 Zone, Santa Victoria Rd - Olympic/Heritage (Developer
Reimbursable, Upsize from 12-inch)
3,600
P2582 Central PL - 20-inch, 711 Zone, Eastlake Pkwy - Olympic/Birch, Upsizing 2,500
P2583 Central PL - 20-inch, 624 Zone, Otay Mesa Interconnect 711 PRS Bypass 4,800
P2590 Central PL - 20-inch, 624 Zone, Village 7 (Developer Reimbursable, Upsize from 12-
inch)
6,400
P2597 Central PL – 16-inch, 624 Zone, Main St, Wolf Canyon Bridge (Upsize of Developer
Financed 12-inch)
1,500
P2600 Central PL - 16-Inch, 624 Zone, Village 8E (Developer Reimbursable, Upsize from 12-
inch)
2,100
P2602 Central PL - 16-Inch, 624 Zone, Otay Valley Rd, SR 125 Bridge (Upsize of Developer
Financed 12-inch)
500
P2603 Central PL - 16-inch, 711 Zone, Hunte Parkway, SR 125 Bridge (Upsize of Developer
Financed 12-inch)
600
P2705 Central PL – 30-inch, 980 Zone, Salt Creek – Hunte Pky to 980 Res 8,000
P2033 Regulatory PL - 12-inch, 1296 Zone, Olive Vista - –Oak Grove MS/Presilla 8,800
P2053 Regulatory PL - 20-Inch, 944 Zone, Campo Road - 944-1 Pump Station/944 Reservoirs 5,800
P2056 Regulatory PL - 12-inch, 1296 Zone, Jamul Drive Replacement 3,000
P2156 Regulatory PL - 12-Inch, 1485 Zone, Olive Vista Drive 2,500
P2181 Regulatory PL - 20-inch, 1296 Zone, Proctor Valley Road - Proctor Valley PS/Echo Valley
(Developer Reimbursable, Upsize from 12-inch)
10,500
P2188 Regulatory PL - 24-Inch, 832 Zone, Campo Road - Steele Canyon/944-1 Pump Station 3,400
P2197 Regulatory PL - 24-Inch, 832 Zone, 832-1 Pump Station to 832 Reservoirs 1,800
Chapter 7 Recommended Capital Improvement Program
7.3 Potable Water – Recommended CIP
Otay Water Facilities Master Plan Update Page 7-8 2024
Table 7-3 Potable Water Pipeline CIP Projects
Project No. System Project Description Length (ft)
P2198 Regulatory PL - 24-Inch, 832 Zone, 832 Reservoirs to Steele Canyon H.S. to Stoney Oak
Drive via Campo Rd
5,100
P2203 Regulatory PL - 20-inch, 1296 Zone, Proctor Valley Road – Echo Valley/Pioneer 5,000
P2204 Regulatory PL - 20-inch, 1296 Zone, Pioneer Way - Proctor Valley/1296 Reservoirs 3,100
P2411 Regulatory PL - 1296/944 PRS Upgrade 1296-1 Pump Station Site --
P2412 Regulatory PL - 944/832 PRS Upgrade 944-1 Pump Station Site --
P2586 Regulatory PL - 24-inch, 832 Zone, Campo Road - Florence Terrace / Steele Canyon 1,500
P2591 Regulatory PL - 16-inch, 1296 Zone, Proctor Valley to 1296-4 Reservoir (Developer
Reimbursable, Upsize from 12-inch)
9,500
P2148 La Presa PL - 16-inch, 850 Zone, Jamacha Boulevard - Sweetwater Springs/Trace 5,200
P2407 La Presa Dictionary Hill Fireflow Capacity Pipeline Improvements --
P2611 La Presa Quarry Road Bridge Replacement and Utility Relocation --
P2500 Hillsdale PL - 16-inch, 803 Zone, Padre Dam - Otay Interconnection w/ PRS, Dehesa Valley --
P2517 Hillsdale Helix - Otay Interconnection, Chase Avenue/Fuerte Drive (12-inch) 1,200
Total Phase III 156,600
Chapter 7 Recommended Capital Improvement Program
7.4 Recycled Water – Recommended CIP
Otay Water Facilities Master Plan Update Page 7-9 2024
7.4 Recycled Water – Recommended CIP
The recommended recycled water facility improvements are shown in Appendix A, Exhibits VII and VIII.
The labeling on the exhibit utilizes the District’s naming convention, with an “R” listed before the
“Recycled Water Project Identification Number, i.e. (R1234). Refer to Section 7-1 for descriptions of the
CIP phasing.
Table 7-4 Recycled Water CIP Projects
Project No. System Project Description Length (ft)
Phase I (Present - 2029)
R2159 Central RecPL – 16-in, 680 Zone, Olympic Parkway - Heritage/La Media 5,750
R2028 Central RecPL – 8-in, 680 Zone, Heritage Road to Main Street (Developer
Reimbursable, Upsize from 6-in) 6,300
R2047 Central RecPL – 12-in, 680 Zone, La Media Road - Birch/Main St (Developer
Reimbursable, Upsize from 6-in) 1,300
R2127 Central RecPL – 8-in, 815/680 Zones, Main Street – La Media/Magdalena - 815/680
PRS (Developer Reimbursable, Upsize from 6-in) 1,700
R2037 Central RecPL – 8-in, 680 Zone, Main Street/Caprise Ave/La Media Parkway – Village 8W (Developer Reimbursable, Upsize from 6-in) 4,400
R2038 Central RecPL – 8-in, 680 Zone, Village 3N – Main St, Heritage Rd/Wolf Canyon
(Developer Reimbursable, Upsize from 6-in) 3,300
Total Phase I 22,750
Phase II (2030 - Ultimate) – Pump Stations
R2129 Central RecPS - 680-1 PS Upgrade, Pumping Flexibility -
R2130 Central RecPS - 944-1 PS Upgrade, Pumping Flexibility -
Total Phase IIA
Phase IIB (2030 - Ultimate) – Transmission Improvements
R2080 Central RecPL – 24-in, 680 Zone, Olympic Parkway between Brandywine/Santa
Victoria 3,800
R2082 Central RecPL – 24-in, 680 Zone, Santa Victoria - Olympic Parkway/Heritage (Developer Reimbursable, Upgrade from 6-in) 3,500
R2085 Central RecPL – 20-in, 680 Zone, La Media – Santa Venetia/Olympic 2,500
R2128 Central RecPL – 16-in, 944 Zone, Hunte Pwy/Proctor Valley Road – North of Otay
Lakes Road 7,300
R2170 Central RecPRS – 944/680 PRS Improvements, Otay Lakes Road -
Total Phase IIB 17,100
Phase IIC (2030 - Ultimate) – Distribution and Development Improvements
R2042 Central RecPL – 8-in, 815 Zone, Hunte Parkway - SR-125/Eastlake (Developer
Reimbursable, Upsize from 6-in) 2,700
R2043 Central RecPL – 8-in, 815 Zone, Rock Mountain Road – Olympian HS/SR 125
(Developer Reimbursable, Upsize from 6-in) 1,000
R2079 Central RecPL – 6-in, 450 Zone, Main Street/Heritage Rd, Entertainment, 680/450 PRS 3,000
R2126 Central RecPL – 8-in, 680 Zone, Main Street – Wolf Canyon Bridge (Upsize from
Developer Financed 6-in) 1,500
R2131 Central Res - 680-2 Storage Reservoir (2.0 MG) (at Sunset View Park) -
Chapter 7 Recommended Capital Improvement Program
7.5 Water Supply Projects – Recommended CIP
Otay Water Facilities Master Plan Update
Page 7-10
2024
R2132 Central RecPL – 8-in, 680 Zone, Main Street – Village 4 (Developer Reimbursable,
Upsize from 6-in) 3,600
R2133 Central RecPL – 8-in, 680 Zone, La Media Parkway – Village 8E (Developer Reimbursable, Upsize from 6-in) 2,100
R2134 Central RecPL – 8-in, 680 Zone, La Media Parkway – Village 9 (Developer Reimbursable, Upsize from 6-in) 4,000
R2135 Central RecPL – 8-in, 680 Zone, University/Village 10 (Developer Reimbursable,
Upsize from 6-in) 4,200
R2136 Central RecPL - 8-in, 680 Zone, La Media Parkway, SR 125 Bridge (Upsize from
Developer Financed 6-in)
500
R2137 Central RecPL - 8-in, 815 Zone, Hunte Parkway, SR 125 Bridge (Upsize from Developer Financed 6-in) 600
Total Phase IIC 23,200
7.5 Water Supply Projects – Recommended CIP
Water supply projects are included to support future water supply requirements within the District and
reduce reliance on supplies from SDCWA and storage projects. These projects include capacity
acquisitions from existing treatment facilities.
Table 7-5 Water Supply Projects
Project No. System Project Description Anticipated Yield (AFY)
Potable Water
P2703(1) Central Otay WTP Supply Capacity 11,200
P2704 Central Perdue WTP Supply Capacity 11,200
Total Potable Water 11,200
Recycled Water
R2171 Central San Diego South Bay Recycled Water Supply 6,720
Total Recycled Water
Appendix Contents
A. Water and Recycled Water Facilities
Exhibits
B. Planned Development Projects
C. Baseline Per Unit Demand by Pressure Zone
D. Other Demand Factors by Pressure Zone
E. Water Unit Use and Duty Factors
APPENDIX A
Water and Recycled Water
Facilities Exhibits
APPENDIX B
Planned Development
Projects
Water System Planned Development Project
SF (DU) MF (DU) Commercial Dev. (ac) Industrial Dev. (ac) Community Purpose Facility (ac)
Park Land (ac)
School Property (ac) Level of Completion Sources
Regulatory System
Peaceful Valley Ranch 52 12.1
Simpson Farm 94 0.9 Simpson Farms Project Agricultural Resources Report
Honey Springs Ranch 389 Jamul/Dulzura Subregional Plan San Diego County General Plan
Rancho Jamul Estates 151 3.6 ``
Rancho Jamul Grande 23
Planning Area 17 296
Sweetwater Village
126 0.4
Private Drive Estates 300
Lakeshore 100
Central Area System
Vista Mother Miguel 41 Complete
Bella Lago 140 Complete
Birch Foundation 128
Bonita Meadows 496 1.6 Complete
Eastlake Design District 28.9
Eastlake Woods/Trails 661 Complete Eastlake II General Development Plan Eastlake Trails SPA Eastlake Vistas 777 1,197 Complete Eastlake II General Development Plan Eastlake Trails SPA
El Dorado Ridge 104
Main St. Auto Park 47.7
Main St. Industrial 81.5
Water System Planned Development Project
SF (DU) MF (DU) Commercial Dev. (ac) Industrial Dev. (ac) Community Purpose Facility (ac)
Park Land (ac)
School Property (ac) Level of Completion Sources
Jackson Place 116 0.5
San Miguel Ranch 889 514 5.1 Complete San Miguel Ranch GDP/SPA Plan
Sunbow* 718 0.9 12.9 OWD WSA for Sunbow II, Phase 3 Project
Village 2* 614 3,924 22.5 149.9 14.1 63.6 19.8 Less than half of structures present.
SAMP No.2: Potable and Recycled Water Otay Ranch Village 2
Village 3* 813 452 8.6 17 2.7 25.9 8.3 Nearly Complete Village 3 North SAMP
Village 4* 750 70 No Development Village of Montecito & Otay Ranch Business Park SPA Village Two, Village Three, and A Portion of Four Otay Ranch GDP Village 5 4.5 Otay Ranch SPA One Plan Village one, Village One West and Village Five Village 6 925 1,295 13.7 7.6 10 Complete Village Six SPA Otay Ranch GDP Village 7 804 316 7.2 6.3 Complete Village Seven SPA Otay Ranch GDP Village 8 West* 562 1,772 42.7 5.5 23.4 11.1 30% Grading Village 8 West SAMP
Village 8 East* 3,276 47.7 2 50.6 Some Grading Otay Ranch Village 8 East SPA Plan
Village 9* 105 3,895 17.8 5.0 27.5 19.8 Some Grading SPA Plan for Village 9
Village 10* 695 1,045 4.3 7.6 9.2 Some Grading Otay Ranch Village 10 SPA Plan Village 11* 1,101 1,144 5.0 16.7 36.6 Complete Otay Ranch Village 11 SPA Plan
Village 14 1,266 2.7 2.3 19.7 9.9 No Development OWD WSA for Otay Ranch Village 14 and Planning Areas 16/19Proposed Project Amendment Village 15
Regional Technology Park 85
University* 2500 383.8 Some Grading OWD WSA for the University Innovation District Project
Planning Area 12 (EUC)* 3313 75.9 11.9 25.6 6.0 Some structures present
Otay Ranch Eastern Urban Center SPA
Planning Area 12 (FC-2)* 900 4.0 2.0 Some structures present
SAMP No.2: Potable and Recycled Water Otay Ranch Planning Area 12
Planning Area 16 158
Water System Planned Development Project
SF (DU) MF (DU) Commercial Dev. (ac) Industrial Dev. (ac) Community Purpose Facility (ac)
Park Land (ac)
School Property (ac) Level of Completion Sources
Planning Area 18b
Planning Area 19 20
Planning Area 20 15 188
AOI to Link with Central Area System
Village 13 1881 257 14.1 2.1 29.6 10 No Development OWD WSA for Otay Ranch Resort Village
Otay Mesa System
Central Village 4,485 44.9 12.6 13.1 Some Grading SAMP for Phase 1 and 2 of Lumina Development
Sunroad 545 856 62 No Development 250 East Otay Mesa SAMP Amendment No. 1
Other Developments 582 784.4 6712.4 1299.2 5.0 Some Grading and few structures
Otay Crossing Commerce Park Sub-Area Water Master Plan No. 1 & East Otay Mesa Specific Plan
Quarry Hills 105.0 Some Grading OWD WSA for Otay Hills Project La Presa System
Sweetwater Vistas 183 50% Grading SAMP: Potable and Recycled Water Sweetwater Vistas OWD Work Order No. D1012-090345 Notes: Developments noted with (*) are expected to have recycled water service.
Lake Murray
Eastlake Trails (ET) Village 2 (V2)
Eastlake Vistas (EV) Village 3 (V3)
Eastlake Woods (EW) Village 4 (V4)
Planning Area 12 (EUC) Village 8 East (V8E)
Sunroad (S) Village 13 (V13)
Loveland Reservoir
Sweetwater Reservoir
V14
SMR
GA EW
ET EV
FC-2 V6 V11
V13 Otay Reservoir
V2 V7 EUC S2 V8E V9
V3 V4 V8W
U2 U
V10
805
CV1-3
S MI QH
I0
Appendix B Future Developments
Otay Water District AOI
Otay Water District Jurisdiction
OWD Water Facilities Master Plan
April 2023
Water Main Pipes
Village 14 (V14) University (U)
Miscellaneous Industrial (MI)
Univesity (U2)
Legend
Central Village Phase: I, II, & III (CV1-3)
Village 11 (V11) Sunbow II, Phase 3 (S2)
Village 10 (V10) San Miguel Ranch (SMR)
Village 9 (V9) Quary Hills (QH)
Village 8 West (V8W) Planning Area 12 (FC-2)
Village 7 (V7)
Village 6 (V6) Glen Abbey Memorial Park & Mortuary (GA)
3 Miles 1.5
APPENDIX C
Baseline Per Unit Demand
by Pressure Zone
Pressure Zone Single Family Residential
(Gallons/housing unit/day)
Multifamily Residential
(Gallons/housing unit/day)
CII (Gallons/employee/day)
340 218 252 63
458 231 455 214
485 254 157 188
493 190 148 32
520 273 162 110
580 447 148 683
624 271 194 86
640 185 225 72
657 273 99 361
711 273 148 138
803 360 153 377
832 376 148 238
850 244 160 168
860 242 148 138
870 (Existing Development)1
273
148
93
870 (Future Development) 38
932 273 148 138
944 223 148 361
978 484 148 439
980 (Existing Development) 2
321
288
115 980 (Future
Development) 148
1004 190 148 1
1050 273 148 57
1090 393 148 465
1100 623 148 1303
1200 833 148 96
1296 364 220 82 1485 359 148 104
1530 509 148 138
1655 664 148 138
For pressure zone that do not currently have water use in a given sector, pressure zone 711 was used as a proxy to represent new development in all sectors.
1. A couple of large water users in the CII sector skew the demand. For future development, the CII unit use was calculated without these existing large water users.
2. Future development of multifamily houses is expected to be more water efficient than existing multifamily houses. Multifamily per unit use was assumed to be consistent with pressure zone 711.
APPENDIX D
Other Demand Factors
by Pressure Zone
Single Family persons Per Household
System Area/
Pressure Zone
Projection Year
2025 2030 2035 2040 2045 2050 2055
La Presa
Pressure Zone 493 3.38 3.18 3.20 3.03 3.04 2.94 2.89
Pressure Zone 640 3.20 3.19 3.13 3.10 3.09 3.06 3.04
Pressure Zone 657 3.14 3.10 3.06 3.01 2.93 2.95 2.92
Pressure Zone 850 2.78 2.80 2.77 2.78 2.78 2.82 2.83
Pressure Zone 1004 3.18 3.01 2.85 2.92 3.05 3.02 3.07
Pressure Zone 1050 2.88 2.80 2.84 2.93 3.03 3.06 3.13
Hillsdale
Pressure Zone 803 2.75 2.71 2.66 2.64 2.64 2.65 2.65
Pressure Zone 860 2.73 2.82 2.74 2.68 2.72 2.68 2.67
Pressure Zone 978 2.83 2.80 2.75 2.73 2.72 2.74 2.75
Pressure Zone 1200 2.81 2.72 2.76 2.68 2.64 2.72 2.74
Regulatory
Pressure Zone 520 2.64 2.61 2.65 2.75 2.81 2.72 2.71
Pressure Zone 832 2.83 2.61 2.63 2.58 2.61 2.59 2.59
Pressure Zone 932 3.13 2.79 2.62 2.57 2.70 2.36 2.25
Pressure Zone 944 3.27 3.05 2.52 2.77 2.78 2.75 2.74
Pressure Zone 1090 2.86 3.01 2.55 2.57 2.62 2.41 2.33
Pressure Zone 1296 2.86 2.86 2.78 2.74 2.66 2.66 2.63
Pressure Zone 1485 2.86 2.81 2.77 2.71 2.70 2.83 2.88
Pressure Zone 1530 3.05 2.88 2.89 2.86 2.70 2.80 2.77
Pressure Zone 1655 2.84 3.20 3.01 2.89 2.85 2.73 2.65
Central
Pressure Zone 340 3.38 3.34 3.23 3.23 3.20 3.10 3.04
Pressure Zone 458 3.35 3.32 3.22 3.23 3.18 3.17 3.13
Pressure Zone 485 3.03 2.98 2.95 2.97 2.99 3.04 3.07
Pressure Zone 580 3.28 3.08 3.03 3.13 3.10 3.13 3.12
Pressure Zone 624 3.20 3.15 3.10 3.14 3.14 3.14 3.15
Pressure Zone 711 3.24 3.19 3.12 3.11 3.13 3.13 3.14
Pressure Zone 980 3.34 3.27 3.21 3.18 3.16 3.15 3.14
Pressure Zone 1100 3.56 3.27 3.22 3.27 3.09 3.19 3.14
Otay Mesa
Pressure Zone 870 4.40 4.20 4.13 3.95 3.78 3.55 3.36
Multifamily persons Per Household
System Area/
Pressure Zone
Projection Year
2025 2030 2035 2040 2045 2050 2055
La Presa
Pressure Zone 493 3.13 3.06 3.02 3.02 3.01 3.01 3.01
Pressure Zone 640 3.20 3.19 3.13 3.10 3.10 3.06 3.04
Pressure Zone 657 3.15 3.11 3.07 3.01 2.93 2.96 2.93
Pressure Zone 850 2.78 2.80 2.77 2.78 2.78 2.82 2.83
Pressure Zone 1004 3.13 3.06 3.02 3.02 3.01 3.01 3.01
Pressure Zone 1050 3.13 3.06 3.02 3.02 3.01 3.01 3.01
Hillsdale
Pressure Zone 803 2.75 2.71 2.66 2.64 2.64 2.65 2.65
Pressure Zone 860 3.13 3.06 3.02 3.02 3.01 3.01 3.01
Pressure Zone 978 3.13 3.06 3.02 3.02 3.01 3.01 3.01
Pressure Zone 1200 3.13 3.06 3.02 3.02 3.01 3.01 3.01
Regulatory
Pressure Zone 520 2.64 2.61 2.65 2.74 2.81 2.72 2.71
Pressure Zone 832 3.13 3.06 3.02 3.02 3.01 3.01 3.01
Pressure Zone 932 3.13 3.06 3.02 3.02 3.01 3.01 3.01
Pressure Zone 944 3.13 3.06 3.02 3.02 3.01 3.01 3.01
Pressure Zone 1090 3.13 3.06 3.02 3.02 3.01 3.01 3.01
Pressure Zone 1296 2.88 2.90 2.80 2.82 2.61 2.61 2.52
Pressure Zone 1485 3.13 3.06 3.02 3.02 3.01 3.01 3.01
Pressure Zone 1530 3.46 3.08 3.23 3.04 3.33 3.48 3.70
Pressure Zone 1655 3.13 3.06 3.02 3.02 3.01 3.01 3.01
Central
Pressure Zone 340 3.38 3.33 3.23 3.23 3.20 3.11 3.04
Pressure Zone 458 3.35 3.32 3.23 3.23 3.18 3.17 3.14
Pressure Zone 485 3.03 2.98 2.95 2.97 2.99 3.04 3.08
Pressure Zone 580 3.42 3.17 3.12 3.26 3.17 3.16 3.10
Pressure Zone 624 3.20 3.15 3.10 3.14 3.14 3.14 3.14
Pressure Zone 711 3.24 3.19 3.12 3.11 3.13 3.13 3.13
Pressure Zone 980 3.34 3.27 3.20 3.18 3.16 3.15 3.15
Pressure Zone 1100 3.13 3.06 3.02 3.02 3.01 3.01 3.01
Otay Mesa
Pressure Zone 870 3.13 3.06 3.02 3.02 3.01 3.01 3.01
Single Family Density in Houses per Acre
System Area/
Pressure Zone
Projection Year
2025 2030 2035 2040 2045 2050 2055
La Presa
Pressure Zone 493 5.4 5.4 5.4 5.4 5.4 5.4 5.4
Pressure Zone 640 5.1 5.0 5.0 5.0 5.0 5.0 5.0
Pressure Zone 657 3.1 2.9 2.9 2.9 2.9 2.9 2.9
Pressure Zone 850 3.9 3.7 3.7 3.7 3.7 3.7 3.7
Pressure Zone 1004 4.5 4.4 4.4 4.4 4.4 4.4 4.4
Pressure Zone 1050 4.3 4.3 4.3 4.3 4.3 4.3 4.3
Hillsdale
Pressure Zone 803 1.3 1.2 1.2 1.2 1.2 1.2 1.2
Pressure Zone 860 2.4 2.4 2.4 2.4 2.4 2.4 2.4
Pressure Zone 978 1.0 1.0 1.0 1.0 1.0 1.0 1.0
Pressure Zone 1200 0.4 0.4 0.4 0.4 0.4 0.4 0.4
Regulatory
Pressure Zone 520 0.0 0.0 0.0 0.0 0.0 0.0 0.0
Pressure Zone 832 0.9 0.8 0.8 0.8 0.8 0.8 0.8
Pressure Zone 932 0.2 0.2 0.2 0.2 0.2 0.2 0.2
Pressure Zone 944 0.4 0.3 0.3 0.3 0.3 0.3 0.3
Pressure Zone 1090 0.1 0.1 0.1 0.1 0.1 0.1 0.1
Pressure Zone 1296 0.3 0.3 0.3 0.3 0.3 0.3 0.3
Pressure Zone 1485 0.3 0.3 0.3 0.3 0.3 0.3 0.3
Pressure Zone 1530 0.4 0.4 0.4 0.4 0.4 0.4 0.4
Pressure Zone 1655 0.2 0.1 0.1 0.1 0.1 0.1 0.1
Central
Pressure Zone 340 9.2 9.2 9.2 9.2 9.2 9.2 9.2
Pressure Zone 458 6.6 6.6 6.6 6.6 6.6 6.6 6.6
Pressure Zone 485 4.3 4.3 4.3 4.3 4.3 4.3 4.3
Pressure Zone 580 1.0 0.9 0.9 0.9 0.9 0.9 0.9
Pressure Zone 624 5.5 5.7 5.7 5.7 5.7 5.7 5.7
Pressure Zone 711 5.9 5.9 5.9 5.9 5.9 5.9 5.9
Pressure Zone 980 6.5 6.6 6.6 6.6 6.6 6.6 6.6
Pressure Zone 1100 1.2 1.1 1.1 1.1 1.1 1.1 1.1
Otay Mesa
Pressure Zone 870 0.2 0.2 0.2 0.2 0.2 0.2 0.2
Multifamily Density in Houses per Acre
System Area/
Pressure Zone
Projection Year
2025 2030 2035 2040 2045 2050 2055
La Presa
Pressure Zone 493 0.0 0.0 0.0 0.0 0.0 0.0 0.0
Pressure Zone 640 18.8 18.8 18.8 18.8 18.8 18.8 18.8
Pressure Zone 657 5.1 5.1 5.1 5.1 5.1 5.1 5.1
Pressure Zone 850 25.3 27.4 29.6 31.7 33.8 36.0 38.1
Pressure Zone 1004 0.0 0.0 0.0 0.0 0.0 0.0 0.0
Pressure Zone 1050 0.0 0.0 0.0 0.0 0.0 0.0 0.0
Hillsdale
Pressure Zone 803 19.3 21.0 22.6 24.3 26.0 27.6 29.3
Pressure Zone 860 0.0 0.0 0.0 0.0 0.0 0.0 0.0
Pressure Zone 978 0.0 0.0 0.0 0.0 0.0 0.0 0.0
Pressure Zone 1200 0.0 0.0 0.0 0.0 0.0 0.0 0.0
Regulatory
Pressure Zone 520 14.2 14.2 14.2 14.2 14.2 14.2 14.2
Pressure Zone 832 0.0 0.0 0.0 0.0 0.0 0.0 0.0
Pressure Zone 932 0.0 0.0 0.0 0.0 0.0 0.0 0.0
Pressure Zone 944 0.0 0.0 0.0 0.0 0.0 0.0 0.0
Pressure Zone 1090 0.0 0.0 0.0 0.0 0.0 0.0 0.0
Pressure Zone 1296 0.6 0.1 0.1 0.1 0.1 0.1 0.1
Pressure Zone 1485 0.0 0.0 0.0 0.0 0.0 0.0 0.0
Pressure Zone 1530 3.1 3.1 3.1 3.1 3.1 3.1 3.1
Pressure Zone 1655 0.0 0.0 0.0 0.0 0.0 0.0 0.0
Central
Pressure Zone 340 21.2 21.1 21.1 21.1 21.1 21.1 21.1
Pressure Zone 458 36.7 36.7 36.7 36.7 36.7 36.7 36.7
Pressure Zone 485 27.4 27.4 27.4 27.4 27.4 27.4 27.4
Pressure Zone 580 0.0 0.0 0.0 0.0 0.0 0.0 0.0
Pressure Zone 624 140.5 140.5 140.5 140.5 140.5 140.5 140.5
Pressure Zone 711 17.1 17.4 17.7 18.0 18.3 18.6 19.0
Pressure Zone 980 27.2 29.4 31.5 33.7 35.8 38.0 40.1
Pressure Zone 1100 0.0 0.0 0.0 0.0 0.0 0.0 0.0
Otay Mesa
Pressure Zone 870 47.8 47.8 47.8 47.8 47.8 47.8 47.8
APPENDIX E
Water Unit Use and
Duty Factors
Water Unit Use and Duty Factors -- 2022 Update
Land Use
Code
Land Use Type
2015 WRMP
Total Unit
Demand
2015 WRMP
Adjusted
Potable Unit
Demand
Average 2019
Potable Billing
Data
2022 MP Total
Unit Demand
Recycled
Water
Reduction Factor
2022 MP
Adjusted Potable
Unit Demand 1
Change
VL
SFR Rural Estate
Very Low Residential (<1 DU/ac) (1-in. or larger meter)
1,000 gpd/DU 1,000 gpd/DU 706 gpd/DU 800 gpd/DU - 800 gpd/DU -20%
L
SFR Custom Lot
Low Density Residential
(1-3 DU/ac) (1-in. meter)
700 gpd/DU
700 gpd/DU
426 gpd/DU
500 gpd/DU
-
500 gpd/DU
-29%
M SFR Standard Medium-Density Residential
(4-10 DU/ac typ.) (3/4-in. meter)
435 gpd/DU 370 gpd/DU 273 gpd/DU 300 gpd/DU 0.15 255 gpd/DU -31%
HD
MFR
High-Density Residential
(typ >10 DU/ac)
200 gpd/DU 170 gpd/DU 148 gpd/DU 150 gpd/DU 0.15 128 gpd/DU -25%
E School 1,785 gpd/ac 1,428 gpd/ac n/a 1,500 gpd/ac 0.20 1,200 gpd/ac -16%
R Church / Religious Facility 1,785 gpd/ac 1,428 gpd/ac n/a 1,500 gpd/ac 0.20 1,200 gpd/ac -16%
CPF Community Purpose Facility 893 gpd/ac 714 gpd/ac n/a 750 gpd/ac 0.20 600 gpd/ac -16%
HP Hospital / Medical Facility 3,035 gpd/ac 2,428 gpd/ac n/a 2,500 gpd/ac 0.20 2,000 gpd/ac -18%
C Commercial 1,785 gpd/ac 1,607 gpd/ac n/a 1,500 gpd/ac 0.10 1,350 gpd/ac -16%
I(W)
Industrial, specific to warehouse
industrial common in Otay Mesa; other
Industrial per custom analysis
893 gpd/ac 848 gpd/ac n/a 850 gpd/ac 0.05 808 gpd/ac -5%
IRR 2 Irrigation 1,900 gpd/ac 1,900 gpd/ac n/a 1,900 gpd/ac - 1,900 gpd/ac n/c
Other /
Custom 3 Other, or non-standard uses requiring custom analysis Custom 3 Custom 3 n/a Custom 3 Custom 3
Otay Unit Use and Duty Factors.xlsx
Notes:
1. District reserves the right to adjust unit demands to fit specific circumstances of individual development projects, and to undertake or require applicants to undertake custom demand analysis subject to District review and approval.
2. IRR unit demand based on average District ETo = 52-in./yr (CIMIS Zones 6 and 9), average landcape ordinance limit of 50% ETo, average usable rainfall = 8 in., and irrigation efficiency of 85%
3. Requires custom water use projection, subject to District review
STAFF REPORT
TYPE MEETING: Regular Board MEETING DATE: February 5, 2025
SUBMITTED BY: Jeff Marchioro
Senior Civil Engineer
PROJECT: P2578-
001103
DIV. NO. 1
APPROVED BY: Beth Gentry, Engineering Manager
Michael Long, Chief, Engineering
Jose Martinez, General Manager
SUBJECT: Approval to Pre-purchase a Pump for the 711 Pump Station
GENERAL MANAGER’S RECOMMENDATION:
That the Otay Water District (District) Board of Directors (Board)
authorize the General Manager to issue a Purchase Order to Muniquip
LLC (Muniquip) for the purchase of a Simflo vertical turbine pump in
an amount not-to-exceed $156,000 (see Exhibit A for Project Location).
COMMITTEE ACTION:
Please see Attachment A.
PURPOSE:
To obtain Board authorization for the General Manager to issue a
Purchase Order to Muniquip for the purchase of a Simflo vertical
turbine pump in an amount not-to-exceed $156,000.
AGENDA ITEM 6
2
ANALYSIS:
The District’s existing 711 Pump Station was originally built in 1992
with the intent of five (5) nominal 4,000 GPM pumps. However, due to
hydraulic challenges with the suction manifold, the pumps experienced
excessive cavitation and wear when operating at the original design
capacity as further described in the April 6, 2011 Staff Report
(Exhibit B). The Board authorized reduced flow equipment based on
cost savings for less frequent pump replacements and demands
projected seven to ten years into the future such that the capacity
would be re-evaluated prior to the next pump replacement.
CIP P2578 was envisioned as a total replacement for the 711 Pump
Station with a budget of $16M in the 2015 Water Facilities Master
Plan (WFMP). Although District demands can be met with the existing
low flow pumps, the 2015 WFMP goal to limit run hours outside of
SDG&E peak rates warrant increasing the flow to restore the original
pump station capacity of nominal 4,000 GPM each pump.
In 2021, the CIP P2578 scope and budget were reworked, assuming a
smaller pump station in a separate building to supplement the
existing 711 Pump Station and reduce cost to $8M.
Recently, the CIP P2578 concept was again re-evaluated with a new
concept to restore the original 4,000 GPM per pump capacity while
utilizing pump station structure to further reduce cost. The initial
project will remove one (1) of the existing five (5) nominal 2,500
GPM pumps and replace it with a nominal 4,000 GPM pump and
reconfigured discharge and suction piping as a pilot project. The
pilot will provide a better understanding of the constructability and
operability of restoring the original 4,000 GPM nominal pump capacity
throughout the facility. If the pilot goes well, the remaining pumps
will be replaced at less than half the budgeted amount for the
smaller supplemental pump station. While the revised design creates
a more congested floor plan than at typical District facilities,
Operations staff have reviewed and agreed with the proposed, given
the cost savings and other benefits such as reducing the number of
structures at the site and extending the life of the Pump Station.
To ensure timely delivery of the pump, District staff prepared a pre-
purchase pump specification and design drawings. Specifications,
drawings, and the District’s purchasing standard terms and conditions
were posted to PlanetBids on November 4, 2024.
Quotes received through PlanetBids were opened on November 18, 2024,
with the updated results shown in the table below.
3
REPRESENTATIVE
/PUMP
MANUFACTURER
TAXABLE
AMOUNT
SALES TAX
@8.75%
SHIPPING &
FIELD
TESTING
COMPARABLE
AMOUNT
1 Muniquip
/Simflo $122,753.50 $10,740.93 $7,950.00 $141,444.43
2 Barrett Pumps*
/Peerless* $165,931.00 $14,518.96 $12,343.00 $192,792.96
3 Sloan*
/Flowise $125,661.00 $10,995.34 Not
quoted
Not
applicable
* Barrett Pump submitted a reduced scope and quoted amount on
December 10, 2024.
** Sloan/Flowise submitted a quote late on November 20, 2024;
however, the proposed Flowise pump was ruled out due to poor
hydraulic fit.
The Engineer’s Estimate is $180,000.
Staff anticipates some modifications will be needed after the review
of shop drawings to include District directed changes to meet
District operation and maintenance requirements. Subsequently, a ten
percent (10%) contingency of $14,144 is included in the award amount
to allow staff to modify the purchase order to make District-directed
changes, if any.
The proposed Simflo pump meets the hydraulic and dimensional
requirements for this Project. Although Simflo has a limited
municipal California presence, the Padre Dam Municipal Water District
and the City of Anaheim reported good experience with Simflo.
A public works construction bid for the Phase I pilot project to
install the pre-purchased pump, reconfiguration and replacement of
existing suction and discharge piping, and replacement of an existing
surge tank will be publicly advertised for construction bid in late
February or early March 2025. Award of the construction contract is
anticipated for the Engineering, Operations, and Water Resources
(EO&WR) Committee in April and Board Meeting in May 2025. Phase I
pilot project construction is anticipated to finish in spring 2026.
FISCAL IMPACT: Joe Beachem, Chief Financial Officer
The total budget for CIP P2578, as approved in the FY 2025 budget, is
$8,000,000. If the initial pilot is successful, then total
expenditures, plus outstanding commitments and forecast including
this contract, are estimated at $2,921,653. See Attachment B for
budget detail.
4
Based on a review of the financial budgets, the Project Manager
anticipates that the budget for CIP P2578 is sufficient to support
the Project.
The Finance Department has determined that, under the current rate
model, 69% of the funding will be available from the Replacement Fund
and 31% of the funding will be available from the Betterment ID 22
Fund.
GRANTS/LOANS:
Engineering staff researched and explored grants and loans and found
none available for this Project.
STRATEGIC GOAL:
This Project supports the District’s Mission statement, “To provide
exceptional water and wastewater service to its customers and to
manage District resources in a transparent and fiscally responsible
manner,” and the General Manager’s Vision, "To be a model water
agency by providing stellar service, achieving measurable results,
and continuously improving operational practices."
LEGAL IMPACT:
None.
JM/BG:jf
Attachments: Attachment A – Committee Action
Attachment B – Budget Detail
Exhibit A – Location Map
Exhibit B – April 6, 2011 Staff Report (Procurement of
Pumps and Motors for the 711-1 Pump Station)
ATTACHMENT A
SUBJECT/PROJECT:
P2578-001103 Approval to Pre-purchase a Pump for the 711 Pump Station
COMMITTEE ACTION:
The Engineering, Operations, and Water Resources Committee
(Committee) reviewed this item at a meeting held on January 21, 2025.
The Committee supported staff's recommendation.
NOTE:
The “Committee Action” is written in anticipation of the Committee
moving the item forward for Board approval. This report will be sent
to the Board as a Committee approved item, or modified to reflect any
discussion or changes as directed by the Committee prior to
presentation to the full Board.
ATTACHMENT B – Budget Detail
SUBJECT/PROJECT:
P2578-001103 Approval to Pre-purchase a Pump for the 711 Pump Station
12/13/2024
Budget
8,000,000 CIP Budget1
Planning
Consultant Contracts 3,160 3,160 - 3,160 ENGINEERING PARTNERS INC Planning1 Planning 1
Regulatory Agency Fees 50 50 - 50 COUNTY OF SAN DIEGO Planning2 Planning 2
Standard Salaries 40,827 40,827 - 40,827 Planning3 Planning 3
Total Planning 44,037 44,037 - 44,037
Design 001102
Consultant Contracts 9,920 6,140 3,780 9,920 WOOD RODGERS INC Design1 Design 1
Standard Salaries 55,296 55,296 25,000 80,296 Design2 Design 2
Total Design 65,216 61,436 28,780 90,216
Construction
Standard Salaries 200,000 200,000
141,444 141,444 Muniquip LLC
14,556 14,556 Muniquip LLC Continency (10%)425,000 425,000 Construction contract for Phase I pilot
624,000 624,000 Future remaining 4 pumps pre-purchase
1,200,000 1,200,000 Future remaining 4 pumps construction contract182,400 182,400 Future remaining 4 Pumps Contingency (10%)
Total Construction - - 2,787,400 2,787,400
Grand Total 109,253 105,473 2,816,180 2,921,653
105,473 105,473 0 105,473 Total1 Total 1 FALSE TRUE FALSE FALSE
205,679.00
17,996.91
223,675.91
Vendor/Comments
Otay Water District
p2578-PS 711-2 (PS 711-1 Repl & Exp) 14000gpm
Committed Expenditures
Outstanding
Commitment &
Forecast
Projected
Final Cost
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F
EXHIBIT A
711-2 (PS 711-1 REPLACEMENTAND EXPANSION) - 14,000 GPMLOCATION MAP
OTAY WATER DISTRICT
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711-2 PUMP STATION
PROJECT SITE
ÃÅ125
EXISTING 624-1
RESERVOIR
AGENDA ITEM 7n
STAFF REPORT
TYPE MEETING:Regular Board MEETING DATE:April 6,2011
SUBMITTED BY:Kevin Cameron ~
Assistant Civir~gineer I
PROJECT/
SUBPROJECT:
P2473-001103 DIV.NO.1
APPROVED BY:
(Chief)
APPROVED BY:
(Asst.GM):
SUBJECT:
Ron Ripperger ~
Engineering Manager
Rod Posada ~
Chief,Engineering
Manny Magafi.~.if ..A:
Assistant General~Manager,Engineering and Operations
Procurement of Pumps and Motors for the 711-1 Pump Station
GENERAL MANAGER'S RECOMMENDATION:
That the Otay Water District (District)Board of Directors (Board)
authorizes the General Manager to execute a purchase order with
Sloan Electromechanical Service &Sales (Sloan)for the procurement
of five (5)pumps,motors,and discharge heads for the 711-1 Pump
Station Improvements Project in an amount not to exceed $204,934.45
(see Exhibit A for Project location).
COMMITTEE ACTION:
Please see Attachment A.
PURPOSE:
To obtain Board authorization for the General Manager to execute a
purchase order with Sloan for the procurement of five (5)pumps,
motors,and discharge heads for the 711-1 Pump Station Improvements
Project in an amount not to exceed $204,934.45.
ANALYSIS:
The 711-1 Pump Station (PS),located in Chula Vista,takes suction
primarily from the 624-3 Reservoir and discharges to the 711-1,711-
2,and 711-3 Reservoirs,which serves the 711 pressure zone.
EXHIBIT B
From the Project's beginning in 1989,the 711-1 Pump Station was
designed to run at 16,000 gpm @ 161'Total Dynamic Head (TDH)(i.e.,
four pumps operating,each at 4,000 gpm @ 161'TDH)in order to meet
the existing and projected demands.Over time,the Pump Station has
experienced vibration,noise,and cavitation problems due to running
constantly at the higher capacity.In the 1990's and early 2000's,
the 711-1 Pump Station served as the key component for the Central
Area and needed to remain in service.Therefore,as individual
pumps failed due to cavitation,they were quickly rebuilt,or in
some cases,replaced with varying brands and sizes in an attempt to
solve the problems.In 2007,the 980-2 Pump Station (22,800 gpm)
was put into service.This relieved the 711-1 Pump Station,and has
allowed staff to redesign the pumps and motors based on a lower
overall pump station projected capacity.
Staff reviewed the 711-1 Pump Station's existing conditions.
Currently,there are three different types of pumps installed in the
Pump Station:
•two (2)Fairbanks-Morse 14"3-stage/200 hp each,
4,200 gpm @ 110'TDH
•two (2)Peerless 16"2-stage/200 hp each,4,000 gpm @ 161'TDH
•one (1)Peerless 18"2-stage/250 hp,4,500 gpm @ 163'TDH
At the present time,one of the 16"Peerless pumps is inoperable and
in need of replacement.During the request for proposal period on
this Project,another Peerless pump has experienced problems and
will be out of commission for a short period of time.This will be
remedied with a new mechanical seal,but will only temporarily fix
the problems.
Operations staff currently operates a minimum of two (2)pumps at
the 711-1 Pump Station,which is the ideal operational mode for the
future.Field tests on the Pump Station revealed the lower
discharge head (110'TDH vs.161'TDH)on Pump No.1 (14"3-stage)
and Pump No.4 (14"3-stage)are the "best"operating pumps at the
Pump Station.
Staff has determined that the combination of slower than expected
growth,coupled with an increased conservation effort,has reduced
the demand in the 711 zone,which is not expected to exceed 10,000
gpm until 2020.With this data,along with field tests that were
performed on the Pump Station in May of 2010,Staff concluded that
the best way to resolve the 711-1 Pump Station cavitation problems
was to replace the existing pumps with smaller pumps and motors,and
run the Pump Station at 10,000 gpm @ 120'TDH.This would lower the
inlet suction velocities to approximately 3.0 feet per second (fps)
2
during the two pump operation scenario.The station currently runs
in excess of 4.9 fps,but the Hydraulic Institute's standard
recommends less than 4.0 fps.
In summary,based on the compiled field data and the Hydraulic
Institute Standards it has been determined that the best way to
resolve the 711-1 Pump Station cavitation problems is to replace the
existing pumps with smaller pumps and motors,and run the Pump
Station at 10,000 gpm @ 120'TDH.This will meet the standard
requirements,and still have the ability to meet the demands of the
system.The pumps have a useful life of seven to ten years.As the
pumps approach the end of their useful life,the Pump Station could
be re-evaluated to examine whether the demands have surpassed the
Pump Stations capabilities.By reducing the capacity of the 1989
design from 16,000 gpm to 10,000 gpm,the Pump Station will run in
a two pump operational mode of 5,900 gpm @ 100'TDH (3.0 ft/s on
suction side),and therefore,eliminate the cavitation problems.
Bids were solicited on February 23,2011 from four (4)vendors to
provide five (5)complete pumps with motors and deliver them to the
site based on the design package prepared by Staff.It is the
intent that District staff will install the equipment with their own
labor.A pre-bid meeting was held on March 1,2011 at the 711-1
Pump Station site for the vendors to ask any questions,and become
familiar with the existing site conditions.
The procedure for material purchases outlined in the District's
Purchasing Manual states that a minimum three (3)bids must be
obtained.Should three quotations not be obtainable,documentation
in the form of a "notation of memorandum"must be provided and
attached to the purchase requisition.On March 8,2011,Staff
received two (2)bids.The results are below.
CONTRACTOR TOTAL CORRECTED
AMOUNT AMOUNT
1 Sloan Electromechanical $204,934.45 -
Service &Sales
2 Fairbanks Morse $264,165.00 -
Days after the pre-proposal meeting,Electronic Motor Specialists
(EMS)sent an e-mail stating they would not be bidding on the
Project.Propulsion Controls Engineering (PCE)also did not submit
a bid.
It is recommended that the bid be awarded to Sloan by virtue of
their lower price and their demonstrated ability to provide the
equipment that meets District requirements.
3
FISCAL IMPACT:m
1/1 /
Funding for the overall Project comes from CIP P2473,the 711-1 Pump
Station Improvements Project.
The total budget for CIP P2473,as approved in the FY 2011 budget,
is $500,000.Total expenditures,plus outstanding commitments and
forecast,is $325,451.See Attachment B for budget detail.
Based on a review of the financial budgets,the Project Manager has
determined that the budget is sufficient to support the Project.
Finance has determined that 100%of the funding is available from
the Replacement Fund for CIP P2473.
STRATEGIC GOAL:
This Project supports the Operations Department Mission statement,
"To provide prompt,professional response to all matters related to
the distribution of water to our clients."
LEGAL IMPACT:
None.
G Manager
P:\NORKING\CIP P2473 -711-1 Pump Station Improvement\Staff Reports\BD 04-06-11,Staff Report,711-1 Pump Station Improvements-v2,(Ke-
RR).doc
KC/RR/RP:jf
Attachments:Attachment A -Committee Action
Attachment B -Budget Detail
Exhibit A -Location Map
4
................................................................._.
SUBJECT/PROJECT:
P2473-001103
l_.
ATTACHMENT A
Procurement of Pumps and Motors for the 711-1 Pump Station
COMMITTEE ACTION:
The Engineering,Operations,and Water Resources Committee reviewed
this item at a Committee Meeting held on March 23,2011 and the
following comments were made:
•Staff is requesting that the Board authorize the General
Manager to execute a purchase order with Sloan
Electromechanical Service &Sales (Sloan)for the procurement
of five (5)pumps,motors,and discharge heads for the 711-1
Pump Station Improvements Project in an amount-not-to exceed
$204,934.45.
•Staff stated that the 711-1 Pump Station was constructed in
1991 and serves as a key component for the potable water system
in Chula Vista.Staff indicated that in 2007,the District's
980-2 Pump Station was put in to help reduce demand on the 711-
1 Pump Station.
•Staff indicated that one of the five pumps is inoperatble and
another pump is experiencing a problem with the mechanical
seal,therefore staff has taken the opportunity to analyze the
other existing pumps,motors,and overall pump station output.
It was concluded that installing smaller pumps and motors will
allow the 711-1 Pump Station to run more energy efficient.
•Staff indicated that bids were solicited on February 23,2011,
from four (4)vendors,and that a pre-bid meeting was held on
March 1,2011 attended by three (3)of those vendors.By March
8,2011,two (2)bids were received,one from Sloan
Electromechanical Service &Sales and the other from Fairbanks
Morse.
•Staff from the District's Operations and Engineering
departments reviewed and evaluated the bids and concluded that
Sloan submitted the lowest responsive bid.
Following the discussion,the Committee supported staffs'
recommendation and presentation to the full board as a consent item.
6
ATTACHMENT B
I
..............._._~~._.____.__ ___...1
Procurement of Pumps and Motors for the 711-1 Pump Station
Otay Water District
P2473 -PS-711-1 Pump Station Improvement
Date Updated:February 25.2011
Outstanding ProjectedFinalBUdgetCommittedExpendituresCommitment&Vendor/Comments
500,000 CostForecast
Planning
Labor 7.632 7,632 7,632
Consultant Contracts 390 390 -390 JC HEDEN AND ASSOCIATES INC
Total Planning 8,022 8,022 -8,022
Design
Labor 13,020 13,020 13,020
Consultant Contracts 29.750 29,750 ·29,750 MWH CONSTRUCTORS INC
Total Design 42.770 42,770 ·42,770
Construction
Labor 16,492 16,492 45,000 61,492
Infrastructure Equipment &Mall:204.935 .204.935 204.935 Sloan Electromechanical Service &Sales
1,799 1.799 -1,799 US BANK CORPORATE PAYMENT
265 265 ·265 PENHALL COMPANY
5.672 5,672 -5,672 MESALABORATORIES INC
496 496 -496 Use Tax
Total Construction 229,659 24.724 249.935 274.659
Grand Total 280,451 75,516 249,935 325,451
•
EXHIBIT A
OTAY WATER DISTRICT
711-1 PUMP STAll0N SITE I.COO..
Quality Assurance Approval Sheet
Subject:Procurement of Pumps and Motors for the 711-1
Pump Station
Project No.:P2473-001103
Document Description:Staff Report for the April 6,2011 Board Meeting
Author:
Kevin Cameron
Printed Name
QA Reviewer:
Gary Silverman
Printed Name
Manager:~rl4tr-----:::>-----
Ron Ripperger
Printed Name
Date
The above signatures attest that the attached document has been reviewed and to the best of their ability the
signers verify that it meets the District quality standard by clearly and concisely conveying the intended
information;being grammatically correct and free of formatting and typographical errors;accurately presenting
calculated values and numerical references;and being internally consistent,legible and uniform in its
presentation style.
STAFF REPORT
TYPE MEETING: Regular Board MEETING DATE: February 5, 2025
SUBMITTED BY: Kevin Cameron
Engineering Manager
PROJECT: R2117-001103 DIV. NO. 3
APPROVED BY: Michael Long, Chief, Engineering
Jose Martinez, General Manager
SUBJECT: Approval to Increase the Overall Budget for CIP R2117 in an
amount not to exceed $550,000 for the Ralph W. Chapman Water
Reclamation Facility Disinfection System Improvements Project
(R2117) and Amend the Professional Services Agreement for
Engineering Services with Carollo Engineers, Inc.
GENERAL MANAGER’S RECOMMENDATION:
That the Otay Water District (District) Board of Directors (Board):
1.Approve to increase the CIP R2117 budget (Ralph W. Chapman
Water Reclamation Facility Disinfection System Improvements
Project) by an amount not to exceed $550,000.00 (from
$4,275,000 to $4,825,000), and
2.Authorize the General Manager to execute the Third Amendment
to the Professional Services Agreement with Carollo Engineers,
Inc. (Carollo) for engineering services during construction in
an amount not-to-exceed $100,000 (from $532,569 to $632,569)
(see Exhibit A for Project Location).
COMMITTEE ACTION:
Please see Attachment A.
PURPOSE:
To increase the overall CIP R2117 budget in an amount not to exceed
$550,000 (from $4,275,000 to $4,825,000) for the Ralph W. Chapman
Water Reclamation Facility (Plant) Disinfection System Improvements
AGENDA ITEM 7
2
Project and to obtain Board authorization for the General Manager to
execute the third amendment to the Professional Services Agreement
with Carollo Engineers, Inc. (Carollo) for engineering services
during construction in an amount not-to-exceed $100,000. This
increase is to cover the unanticipated costs for increased
construction management, additional staff inspection and oversight
costs, and additional effort from the design consultant, Carollo,
during staff vacancies in Fiscal Year 2024.
ANALYSIS:
The RWCWRF is a scalping wastewater treatment plant, treating the
District’s wastewater to produce and deliver tertiary recycled water
to the District’s recycled water customers. At the August 23, 2023
Board Meeting, the Board authorized the award of a construction
contract to GSE Construction Co., Inc. (GSE) to convert the existing
chlorine gas disinfection system to an ultraviolet (UV) system.
The Project will result in reduced chlorine levels in the effluent
pump station and force main that is anticipated to extend the life of
the pumps, piping, valves, and appurtenances, as well as lower the
chemical cost at RWCWRF and in the distribution system. Removal of
the chlorine gas at the plant will eliminate the hazardous material,
its transport, associated training, and other regulatory
administrative work. As of December 19, 2024, the Project is
approximately 51% complete.
The budget increase of $550,000 is requested for the following items:
1. Increased Construction Management Effort: $ 80,000
2.Increased Staff & Inspection Effort:$ 250,000
3.Increased Design Consultant (Carollo) Usage:$ 100,000
4.Future Change Order to Avoid Existing Utilities
& Reroute Conduits:$ 120,000
Total: $ 550,000
An explanation for each item is below:
1.The District’s Construction Manager (consultant) effort is
increased due to the complexity of the Project and extra
assistance with the contractor to avoid adversely affecting the
day-to-day operation of the Plant. This included working with
the contractor to modify their schedule to avoid chlorine
deliveries, combining the first and second Plant shutdowns
during a time when the Plant was short staffed, and assisting
3
staff with potential change condition claims by the contractor.
The consultant is also assisting with the SCADA/Electrical
inspection. Staff estimates that $80,000 will be sufficient to
complete the Project.
2.District staff and inspection time is increased due to vacancies
and the complexity of the project and site. The vacancies
included the project manager who was very familiar with the
plant and its processes as well as two (2) support staff. New
staff required extra time to get familiar with the Plant, the
upgrade and the permitting process. In addition, inspection
staff worked with the contractor to avoid potential conflicts
with existing utilities, which resulted in a less complicated
construction for the power and SCADA conduits. Staff estimates
that $250,000 will be sufficient to complete the Project.
3.Staff vacancies required the Design Consultant, Carollo, to
provide more effort to process submittals, request for
information (RFIs), and provide design clarifications for the UV
system operation and construction. Staff anticipates that
Carollo will be utilized more during the startup of the Trojan
UV system and permitting than what was estimated. Staff
estimates that $100,000 will be sufficient to complete the
Project. This amendment will require Board approval. See below
for explanation of the agreement.
4.A construction change order is upcoming for rerouting new power
and SCADA conduits in order to avoid congested alignments and
existing utilities. It is expected that the cost of the change
order is within the General Manager’s signature authority. If
the accumulative total of this change order plus future change
orders is above the General Manager’s signature amount, they
will be presented to the Board for approval.
District and Consultant entered into a Professional Services
Agreement on July 21, 2021 (the "Original Agreement"), under which
Consultant agreed to provide engineering design services for the
District's Ralph W. Chapman Water Reclamation Facility (RWCWRF)
Disinfection System Improvements Project. The agreement was split
into two CIPs: R2117 for $351,535 and R2157 for $106,839 for a total
compensation of $458,374.
The First Amendment was executed on May 1, 2023, which extended the
term of the agreement two (2) years to a new expiration date of June
30, 2025. All other terms of the agreement remained.
The Second Amendment was executed on June 10, 2024, which increased
the original amount of the agreement allocated to CIP R2117 by
$74,195 to a total compensation of $532,569. All other terms of the
agreement remained. This was approved under the General Manager’s
4
authority. Details for the additional $74,195 for CIP R2117 are
below:
•$8,238 for Design Phase Services Overage – Additional design and
modifications addressing HVAC, lighting, and chemical
containment were requested outside of the original scope
totaling $16,488. Staff has reviewed changes and justification
with the Consultant; staff has negotiated and reduced design
overages to $8,238.
•$63,667 for additional Construction Services in support of the
Project. Engineering had to rely on Carollo’s expertise in
reviewing RFIs, submittals, and additional support in addressing
the Project’s Engineering Report for the Department of Drinking
Water (DDW). The original scope was to review fifteen (15) RFIs
and twenty (20) submittals. As of May 9, 2024, Carollo had
reviewed over twenty (20) RFIs and one hundred (100) submittals.
Engineering anticipates two hundred and sixty (260) submittals
and fifty (50) RFIs at the completion of the Project.
For the Third Amendment, staff is requesting to increase Carollo’s
agreement amount for CIP R2117 by $100,000 to continue to assist the
District during the construction phase of the Project. This will
include the installation of the Trojan UV system, startup and
testing, and reporting to the DDW. In addition, the agreement will
be extended one year for a new termination date of June 30, 2026.
The Project is expected to be completed in early 2026.
In summary, staff is requesting to increase the overall budget for
CIP R2117 in an amount of $550,000 for a new budget amount of
$4,825,000, and have the General Manager execute a Third Amendment
with Carollo for Engineering Services in support of the Project in
the amount of $100,000 for an overall amount for CIP R2117 of
$525,569 and a total amount for both CIPs of $632,569.
FISCAL IMPACT: Joe Beachem, Chief Financial Officer
The total budget for CIP R2117, as approved in the FY 2025 budget, is
$4,275,000. Total expenditures, plus outstanding commitments and
forecast, are $4,823,843.82. See Attachment B for the budget detail.
Based on a review of the financial budget, the Project Manager
anticipates that with a budget increase of $550,000, CIP R2117 will
be completed within the new budget amount of $4,825,000.
5
The additional costs will be incorporated into the FY 2026 budget
process. The additional costs will be funded with savings, rates, or
debt financing.
GRANTS/LOANS:
Engineering staff researched and explored grants and loans and found
none were available for this Project.
STRATEGIC GOAL:
This Project supports the District’s Mission statement, “To provide
exceptional water and wastewater service to its customers, and to
manage District resources in a transparent and fiscally responsible
manner,” and the General Manager’s Vision, "To be a model water
agency by providing stellar service, achieving measurable results,
and continuously improving operational practices."
LEGAL IMPACT:
None.
KC/ML:jf
Attachments: Attachment A – Committee Action
Attachment B – Budget Detail for R2117
Attachment C – Carollo’s Original Professional
Services Agreement for Engineering Design Services
Attachment D – Carollo’s First Amendment for the
Professional Services Agreement for Engineering
Design Services
Attachment E – Carollo’s Second Amendment for the
Professional Services Agreement for Engineering
Design Services
Exhibit A – Project Location Map
ATTACHMENT A
SUBJECT/PROJECT:
R2117-001103
Approval to Increase the Overall Budget for CIP R2117 in an
amount not to exceed $550,000 for the Ralph W. Chapman
Water Reclamation Facility Disinfection System Improvements
Project (R2117) and Amend the Professional Services
Agreement for Engineering Services with Carollo Engineers,
Inc.
COMMITTEE ACTION:
The Engineering, Operations, and Water Resources Committee
(Committee) reviewed this item at a meeting held on January 21, 2025.
The Committee supported staff's recommendation.
NOTE:
The “Committee Action” is written in anticipation of the Committee
moving the item forward for Board approval. This report will be sent
to the Board as a Committee approved item or modified to reflect any
discussion or changes as directed by the Committee prior to
presentation to the full Board.
ATTACHMENT B – Budget Detail for R2117
SUBJECT/PROJECT:
R2117-001103
Approval to Increase the Overall Budget for CIP R2117 in an
amount not to exceed $660,000 for the Ralph W. Chapman
Water Reclamation Facility Disinfection System Improvements
Project (R2117) and Amend the Professional Services
Agreement for Engineering Services with Carollo Engineers,
Inc.
Level Title1 Committed Expenditures Outstanding
Commitment
Projected Final
Cost
Vendor Project Phase
Consultant
Contracts
$111,969.65 $111,969.65 $0.00 $111,969.65 ARCADIS US INC Planning
Regulatory
Agency Fees
$50.00 $50.00 $0.00 $50.00 PETTY CASH CUSTODIAN Planning
Standard
Salaries
$165,905.94 $165,905.94 $0.00 $165,905.94 Planning
Total $277,925.59 $277,925.59 $0.00 $277,925.59
Consultant
Contracts
$255,574.00 $246,117.45 $9,456.55 $255,574.00 CAROLLO ENGINEERS INC Design
$2,161.51 $2,161.51 $0.00 $2,161.51 USABLUEBOOK Design
$880.12 $880.12 $0.00 $880.12 MCMASTER-CARR SUPPLY CO Design
Service
Contracts
$105.30 $105.30 $0.00 $105.30 DAILY JOURNAL CORPORATION Design
Standard
Salaries
$148,234.01 $148,234.01 $0.00 $148,234.01 Design
$6.78 $6.78 $0.00 $6.78 STAPLES INC & SUBSIDIARIES Design
$6,876.12 $6,876.12 $0.00 $6,876.12 ADVANCED TEST EQUIPMENT Design
$17,466.51 $17,466.51 $0.00 $17,466.51 XYLEM/YSI INCORPORATED Design
Total $431,304.35 $421,847.80 $9,456.55 $431,304.35
Construction
Contracts
$3,171,400.00 $1,746,835.00 $1,424,565.00 $3,171,400.00 GSE CONSTRUCTION CO INC Construction
$270,156.00 $108,262.79 $161,893.21 $270,156.00 CAROLLO ENGINEERS INC Construction
$4,598.50 $4,598.50 $0.00 $4,598.50 NINYO & MOORE GEOTECHNICAL Construction
$4,852.00 $4,852.00 $0.00 $4,852.00 PARADIGM GEOSPATIAL INC Construction
$192,455.00 $89,964.00 $102,491.00 $192,455.00 VALLEY CONSTRUCTION
MANAGEMENT
Construction
Service
Contracts
$1,661.38 $1,661.38 $0.00 $1,661.38 ABC IMAGING Construction
Standard
Salaries
$469,491.00 $244,491.00 $225,000.00 $469,491.00 Construction
Total $4,114,613.88 $2,200,664.67 $1,913,949.21 $4,114,613.88
Current Budget $4,275,000.00
Total $4,823,843.82 $2,900,438.06 $1,923,405.76 $4,823,843.82
Project Budget Detail
R2117-RWCWRF Disinfection System Improvements
1/10/2000 - 1/10/2025
Planning
Design
INFRASTRUCTUR
E EQUIPMENT &
MATERIALS
Supplier
Contracts
Construction
Consultant
Contracts
AGREEMENT FOR PROFESSIONAL SERVICES BETWEEN
OTAY WATER DISTRICT
AND
CAROLLO ENGINEERS,INC.
FOR
ENGINEERING SERVICES
This Professional Services Agreement ("Agreement")is made and entered into this
21 day of J Ca Vvj 20 2)by and between the OTAY WATER DISTRICT,a municipal
water district formed and existing pursuant to the California Municipal Water District Act of
1911, as amended,hereinafter referred to as "District,"and Carollo Engineers,Inc., a California
corporation,hereinafter referred to as "Consultant."
RECITALS
WHEREAS,the District requires the services of a professional consultant to render
certain technical and professional services described below; and
WHEREAS,the Consultant has available,and offers to provide,personnel and facilities
necessary to accomplish the work within the required time, and has represented that it is
qualified by experience and ability to perform the services desired by District.
AGREEMENT
NOW,THEREFORE,on the basis ofthe Recitals set forth above,which are incorporated
by reference as though fully set forth herein and form a part ofthe terms of and consideration for
this Agreement,the District and Consultant agree as follows:
I.Scope ofProfessional Services
The Consultant agrees to perform those services described in the Request for Proposal
dated February 17, 2021 (RFP) in connection with the Project, which is incorporated herein by
reference, including specifically those services reflected in the Scope of Work set forth in
Exhibit 4A' attached hereto and incorporated herein by this reference. No term of the
Consultant's proposal submitted in response to the RFP shall modify the terms ofthis Agreement
or the RFP unless specifically incorporated into an Exhibit to this Agreement. The scope of
consulting services shall include meetings with District staff and review of previous technical
documentation. To the extent the provisions ofthe RFP or Exhibit "A" are ambiguous in relation
to the provisions of this Agreement, inconsistent with the provisions of this Agreement, or
expand upon the provisions of this Agreement, the provisions of this Agreement shall take
precedenceand the provisions of the RFP and/or Exhibit"A" shall not apply.
If engineering services are rendered hereunder, the services shall include, but not be
limited to, meetings with District staff, review of technical documentation,plan check and
inspection services,if appropriate and included,and completion of any reportsor documentation
described on the exhibits hereto.
Page 1 of 22
ATTACHMENT C
II.Authorization;Term
Specific authorization to proceed with the work described in Exhibit 'A'is hereby
granted.Upon receipt of a fully executed Agreement from the District,the Consultant shall
proceed with the work described in Exhibit 'A';provided that more specific requests for certain
services therein listed may be made by the District.
This Agreement shall become effective on the date first above written and expires on
June 30, 2023 (the "Term").This Agreement may be terminated or amended as provided below
and may be extended in writing signed by both parties prior to the expiration ofthe Term.
III.Compensation
In return for the Consultant's satisfactory performance of the services described in
Exhibit 'A',as hereafter amended (the "Scope of Work"),the District agrees to pay
compensation up to an amount not-to-exceed FOUR HUNDRED FIFTY EIGHT THOUSAND
THREE HUNDRED SEVENTY FOUR DOLLARS ($458,374.00)payable in proportion to the
work completed,as further described in the paragraph below. The not-to-exceed amount reflects
the budget breakdown per task included in Exhibit 'B'.To the extent the provisions of Exhibit
"B"are ambiguous in relation to the provisions of this Agreement,inconsistent with the
provisions ofthis Agreement, or expand upon the provisions of this Agreement, the provisions of
this Agreement shall take precedence and the provisions of Exhibit "B"shall not apply. Total
compensation for all Professional Services provided under this agreement shall not exceed such
amount during the term ofthis agreement without prior written authorization from the District.
The Consultant shall invoice the District on a monthly schedule in the format shown in
Exhibit "C".To the extent the provisions of Exhibit "C"are ambiguous in relation to the
provisions of this Agreement, inconsistent with the provisions of this Agreement, or expand
upon the provisions of this Agreement, the provisions of this Agreement shall take precedence
and the provisions of Exhibit "C" shall not apply. The Consultant shall not invoice the District
for work that has not been completed at the time the invoice is prepared. The District shall have
forty-five (45) days from the date of receipt of error-free invoices prepared in accordance with
Exhibit "C"to make payment without incurring interest and/or penalty charges.
The Consultant will not be allowed to markup any sub-consultant's work. A maximum
markup of 10% will be allowed on all reimbursable costs. Reimbursable costs are defined as
only vehicle mileage, printing costs, and courier services. Reimbursable expenses will be
included in the total contract amount.
IV.Standard ofCare
A. The Consultant is employed to render the services specified herein and the Scope of
Workonly, and any payment made to the Consultant is compensation solely for such services as
are satisfactorily rendered. The Consultant's services shall be furnished in good faith, in
compliance with best practices for its profession and with the standard of care generally
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employed by professionals licensed and qualified to perform such services within the State of
California.
B.Unless disclosed in writing prior to the date of this Agreement,the Consultant
warrants to the District that it is not now, nor has it for the five (5) years preceding,been
debarred by a governmental agency or involved in debarment,arbitration or litigation
proceedings concerning the Consultant's professional performance or the furnishing ofmaterials
or services relating thereto.
V.Documents
All original drawings,spreadsheets and documents,including digital photographs and
files developed for the project,shall, upon payment in full for the services described in this
Agreement,be furnished to and become the property of the District,except as otherwise
provided in Section VIII:Termination or Abandonment.
The Consultant shall provide final documents on compact disk (CD).Final drawings and
details shall be in AutoCAD®2010 format or more recent.Final Contract Specifications,
reports,and spreadsheets shall be in Microsoft®Office 2010 format or more recent.Any other
electronic format documents provided to the District must be formatted to the same software
version or release as that ofthe District.
VI.Performance and Schedule
The Consultant agrees to coordinate the Scope of Work to ensure its timely completion in
accordance with the agreed upon schedule,and shall promptly notify the District of any
anticipated delays, which may affect the work schedule.In the event the time for completing
the Scope of Work is exceeded due to circumstances beyond the control of the Consultant,the
Consultant shall have an additional amount of time to be agreed upon in writing between the
parties in which to complete the work.
VII.Change in Scope ofWork
Only additional services approved and requested specifically by District in writing, shall
constitute the basis of a change,addition or modification to the Scope of Work.Consultant is
responsible for ensuring that no work or services outside the Scope of Work are performed or
invoiced.
If District requests performance ofany services not within the Scope ofWork, Consultant
shall notify District immediately and shall indicate that no such work will be performed until
approved by the District in writing. Concurrently with such notice, the Consultant shall provide
District a written cost estimate for, and a written description of, each additional task to be
performed.
The extent of additional work required, and any additional compensation therefore,shall
be negotiated by the parties and, if an agreement is reached, the parties will execute an
amendment to Exhibit 'A'and to any other exhibits and/or this Agreement, to the extent required
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to reflect such additional work and compensation.If no agreement is reached,District may
choose to terminate this Agreement and retain another consultant,or may choose to retain
another consultant to provide only the additional services.
Consultant shall not be entitled to compensation for any services rendered that are not
specifically authorized under this Agreement or its Exhibits,and any amendments thereto.Any
and all work performed without proper authorization shall be considered part of this Agreement
for no additional compensation.
VIII.Termination or Abandonment
The District may terminate this Agreement or may terminate or abandon all or any
portion of the Scope of Work at any time and for any reason by giving written notice to
Consultant of such termination and specifying the effective date thereof,at least ten (10)
calendar days prior to the effective date. The District is under no obligation to require all the
services described under the Scope of Work and shall be able to select only those services
needed from time to time, as provided in each work order.Ifthe District abandons or terminates
any services of the Scope of Work, the District has the right to take immediate possession and
ownership of all original,copies or draft specifications,drawings,and other documents
developed for the Scope of Work to the specified date of termination or abandonment.
Following delivery of such documents in a form satisfactory to the District under the terms of
this Agreement,the District will pay the Consultant for any portion ofthe services rendered prior
to termination under the Scope of Work. If said termination occurs prior to full completion of
any task, the portion of the fee to be paid for the portion of work or service performed for such
task shall be based on the percent of completion mutually agreed to by the District and the
Consultant.The District will not be liable for any costs other than the fees or portions thereof,
which are specified herein. If all work is abandoned as herein provided, this Agreement shall
automatically terminate onthe 10th day from thedateof notice.
IX.Indemnification
A.CONSULTANT agrees to the following:
1. To the fullest extent permitted by law,Consultant shall indemnify, protect,
defend (with attorneys approved by District) and hold harmless the District and any and all of its
officials, elected board members, employees, volunteers, consultants and agents ("Indemnified
Parties") from and against any liability (including liability for claims, suits, actions, arbitration
proceedings,administrative proceedings,regulatory proceedings,losses,expensesor costsof any
kind, whether actual, alleged or threatened, including attorney's fees and costs, court costs,
interest, defense costs, and expert witness fees), arising out of or in any way attributable to the
negligence,recklessness,or willful misconductof the Consultant or any individual or entity for
which Consultant is legally liable, including but not limited to officers, agents, employees or
sub-contractors of Consultant.
2.General Indemnification Provisions.Consultant agrees to obtain executed
indemnity Agreements with provisions identical to those set forth here in this section from each
and every sub-contractor or any other person or entity involved by, for, with or on behalf of
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Consultant in the performance of this Agreement.In the event Consultant fails to obtain such
indemnity obligations from others as required here,Consultant agrees to be fully responsible
according to the terms of this section.Failure of District to monitor compliance with these
requirements imposes no additional obligations on District and will in no way act as a waiver of
any rights hereunder.The provisions of this section do not apply to claims which are,after
actual trial,determined to be due to the sole negligence or willful misconduct ofthe Indemnified
Parties.
B. It is expressly understood and agreed that the indemnification provisions of this
Section IX will survive termination ofthis Agreement.
C. The requirements as to the types and limits of insurance coverage to be
maintained by Consultant as required by this Agreement and any approval of said insurance by
District,are not intended to and will not in any manner limit or qualify the liabilities and
obligations otherwise assumed by Consultant pursuant to this Agreement,including,without
limitation,to the provisions concerning indemnification.
X.Insurance Requirements
A. Before commencing performance under this Agreement,and at all other times this
Agreement is effective,Consultant will procure and maintain the following types of insurance
with coverage limits complying,at a minimum,with the limits set forth below:
Type ofInsurance Limits (combined single)
Commercial General liability $1,000,000 per occurrence,$2,000,000
aggregate
Professional liability $1,000,000 per claim, $1,000,000 aggregate
Business automobile liability $1,000,000 per occurrence
Workers compensation Statutory requirement
Employer's Liability $1,000,000 per occurrence
B. The amount of insurance set forth above will be a combined single limit per
occurrence, and aggregate where noted, for bodily injury, personal injury, and property damage
for the policy coverage. District, its officers, officials, employees, and volunteers are to be
covered as additional insureds on the Commercial General liability policy with respect to
liability arising out of work or operations performed by or on behalf of Consultant including
materials, parts, or equipment furnished in connection with such work or operations. General
liability coverage can be provided in the form of an endorsement to the Consultant's insurance
(at least as broad as ISO Form CG 20 10 11 85 or both CG 20 10, CG 20 26, CG 20 33, or CG 20
38; and CG 20 37 forms if later revisions used).Further,the policies shall state that such
insurance will be deemed primary and non-contributory at least as broad as ISO CG 20 01 04 13
as respects District, its officers, officials, employees, and volunteers, such that any other
insurance that may be carried by District will be excess thereto. Such insurance will be on an
"occurrence" basis, except professional liability shall be on a "claims made" basis. For
professional liability coverage provided on a "claims made" basis, Consultant shall maintain
such insurance coverage for four (4) years after expiration of the term (and any extensions)of
this Agreement.In addition,the "retro"date must be on or beforethe date of this Agreement.If
Page 5 of 22
Professional liability coverage is canceled or non-renewed,and not replaced with another claims-
made policy form with a Retroactive Date prior to the contract effective date,Consultant must
purchase "extended reporting"coverage for a minimum of four (4) years after completion of
contract work.Professional liability coverage extends to and includes,but is not limited to,
negligent design claims.
C.Consultant will furnish to District duly authenticated Certificates of Insurance and
Endorsements evidencing maintenance ofthe insurance required under this Agreement and such
other evidence of insurance as may be reasonably required by District from time to time.
Insurance must be placed with insurers with a current A.M.Best Company Rating equivalent to
at least a Rating of "A:VII."Originals of the duly authenticated Certificates of Insurance and
Endorsements shall be included with this Agreement as Exhibit D.
D.Each insurance policy shall state or be endorsed to state that coverage shall not be
canceled by either party,except after thirty (30)days prior written notice by U.S. mail has been
given to the District (10 days prior written notice for non-payment of premium).
Notwithstanding any commitment on the part of the insurer to provide such notice to the District,
failure of the Consultant to provide separate notice of any intent to cancel any policy or change
policy providers, or of any actual or potential cancellation,shall constitute a breach of contract
for which District shall be entitled to full indemnification under the Agreement.Commercial
General Liability shall use Insurance Services Office Form CG 00 01.If a general aggregate
limit applies,either the general aggregate limit shall apply separately to this project/location
(ISO CG 25 03 or 25 04) or the general aggregate limit shall be twice the required occurrence
limit.Automobile liability shall use Insurance Services Office Form Number CA 0001 covering,
Code 1(any auto), or if Consultant has no owned autos, Code 8 (hired)and 9 (non-owned).
E.Consultant shall require and verify that all subcontractors maintain insurance
meeting all the requirements stated herein.
F.Maintenance of specified insurance is a material element of this Agreement,and
Consultant's failure to maintain or renew coverage or to provide evidence of renewal during the
term ofthis Agreement may be treated as a material breach ofcontract by the District.
XI.Successors and Assigns
This Agreement and all ofthe terms, conditions, and provisions hereof shall inure to the
benefit of and be binding upon the parties hereto, and their respective successors and assigns;
provided, however, that no assignment ofthis Agreement shall be made without written consent
of the parties to this Agreement. Any attempt by the Consultant to assign or otherwise transfer
any interest in this Agreement without the prior written consent of the District shall be void.
Since the primary consideration of the District in entering this agreement is the qualifications of
the Consultant, as opposed to a low bid, the District may refuse to consent to assignments at its
sole discretion.
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XII.Project Organization
The Consultant hereby assigns Jeff Weishaar,Project Manager as the Consultant Project
Manager under this Agreement.The Consultant Project Manager shall not be removed from the
project or reassigned without prior written approval of the District, which approval shall not be
unreasonably withheld.
The District hereby assigns Stephen Beppler,Senior Civil Engineer as the District Project
Manager under this Agreement.
XIII.Independent Consultant
Both parties hereto in the performance ofthis Agreement will be acting in an independent
capacity and not as agents, employees, partners or joint ventures with one another. Neither the
Consultant nor the Consultant's employees are employee of the District and are not entitled to
any ofthe rights, benefits, or privileges of the District's employees, including but not limited to
retirement,medical,unemployment,or workers'compensation insurance.
Neither the District nor its officers,agents or employees shall have any control over the
conduct of the Consultant or any of the Consultant's employees except as herein set forth, and
the Consultant expressly agrees not to represent that the Consultant or the Consultant's agents,
servants, or employees are in any manner agents, servants or employees of the District, it being
understood that the Consultant,its agents, servants, and employees are as to the District wholly
independent consultants and that the Consultant's obligations to the District are solely such as
are prescribed by this Agreement.
XIV.Licenses,Permits,Etc.
The Consultant represents and covenants that it has all licenses, permits, qualifications,
and approvals of whatever nature that are legally required to perform the services under this
Agreement. The Consultant represents and covenants that the Consultant shall, at its sole cost
and expense, keep in effect at all times during the term of this Agreement, any license, permit, or
approval which is legally required for the Consultant to perform the services under this
Agreement.
XV.Confidential Information
The District may from time to time communicate to the Consultant certain confidential
information to enable the Consultant to effectively perform the services to be provided herein.
The Consultant shall treat all such information as confidential and shall not disclose any part
thereof without the prior written consent of the District. The Consultant shall limit the use and
circulation of such information,even within its own organization,to the extent necessary to
perform the services to be provided herein.The foregoing obligation of this section,however,
shall not apply to any part of the information that (i) has been disclosed in publicly available
sources of information; (ii) is, through no fault of the Consultant, hereafter disclosed in publicly
available sources of information; (iii) is already in the possession of the Consultant without any
obligation of confidentiality;or (iv)hasbeenor is hereafter rightfully disclosed to the Consultant
Page 7 of 22
by a third party, but only to the extent that the use or disclosure thereof has been or is rightfully
authorized by that third party.
The Consultant shall not disclose any reports,recommendations,conclusions or other
results ofthe services or the existence of the subject matter of this Agreement without the prior
written consent ofthe District. In its performance hereunder,the Consultant shall comply with all
legal obligations it may now or hereafter have respecting the information or other property of
any other person,firm or corporation.
Consultant shall be liable to District for any damages caused by breach of this condition,
pursuant to the provisions of Section IX.
XVI.Miscellaneous
A.Covenant Against Discrimination.Consultant covenants that, by and for itself, its
heirs,executors,assigns and all related persons or entities,that there shall be no discrimination
against or segregation of,any person or group of persons on account of race,color,creed,
religion, sex, marital status, national origin,ancestry or any other classification prohibited by
state or federal law in the performance of this Agreement.Consultant shall take affirmative
action to ensure that applicants are employed and that employees are treated during employment
without regard to their race,color,creed,religion,sex,marital status,national origin,ancestry or
any other classification protected by state or federal law.
B.Non-liability of District Officers and Employees.No officer or employee of
District shall be personally liable to the Consultant,or any successor in interest,in the event of
any default or breach by District or for any amount which may become due to the Consultant or
to its successor,or for breach ofany obligation ofthe terms of this Agreement.
C.Conflict of Interest.No officer or employee of District shall have any financial
interest,direct or indirect,in this Agreement nor shall any such officer or employee participate in
any decision relating to the Agreement which affects his financial interest or the financial interest
of any corporation,partnership or association in which he is,directly or indirectly,interested,in
violation ofany State statute or regulation.The Consultant warrants that it has not paid or given
and will not pay or give any third party any money or other consideration for obtaining this
Agreement.
D. Notice. Any notice or instrument required by, or contemplated under, this
Agreement may be given by depositing the same in any United States Post Office,registered or
certified,postage prepaid,addressed to:
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DISTRICT:CONSULTANT:
Otay Water District Carollo Engineers,Inc.
2554 Sweetwater Springs Boulevard 5355 Mira Sorrento Place,Suite 270
Spring Valley,California 91978-2004 San Diego, CA 92121
Attention: District Project Manager Attention:Jeff Weishaar,Project Manager
Fax:(619)670-8920 Fax:(858)505-1015
Email:steve.beppler@otaywater.gov Email:jweishaar@carollo.com
Copy to:Jose Martinez,General Manager
Notices mailed to the address above shall be effective upon date of mailing.Notices may
also be given via facsimile or electronic communication,and shall be effective on the day so
given,provided that evidence of successful transmission or acceptance via return email is
attached to the Notice as evidence ofthe time and date oftransmittal.
E.Interpretation.The terms ofthis Agreement shall be construed in accordance with
the meaning of the language used and shall not be construed for or against either party by reason
of the authorship of this Agreement or any other rule of construction which might otherwise
apply.
F.Compliance with Laws.Consultant shall comply with all applicable federal,state
and local laws,regulations,statutes and ordinances (collectively,the "Laws")in connection with
this Agreement and the performance ofthe work,including California Labor Code section 1720,
et seq.,relating to payment of prevailing wages for public works projects,if applicable.
Consultant shall indemnify and defend the Indemnified Parties from and against any liability
incurred due to any failure on the part of Consultant to comply with any applicable Laws.
To the extent Consultant is required to comply with prevailing wage requirements,
Consultant does hereby acknowledge that they are aware of, have read, and understand the terms
and implications ofSB 854 and Consultant and any sub-consultants ensure that they are familiar
with and will comply with the recently enacted requirements.Such requirements include, but are
not limited to, the registration requirement with the Department of Industrial Relations, State of
California (DIR),pursuant to Labor Code section 1725.5. As of March 1, 2015, in compliance
with SB 854, the District requires all affected contractors and consultants to be registered with
the DIR prior to submitting a bid or proposal on any eligible District project. As of April 1,
2015, failure to comply with the requirements of SB 854 by any contractor or consultant,
including registration with the DIR pursuant to Labor Code section 1725.5, shall be a material
breach of this Agreement, which may be terminated by the District in its sole and absolute
discretion. Where applicable,this project is subject to compliance monitoring and enforcement
by the DIR.
G.Mediation.If a dispute arises out of or relates to this Agreement,or the breach
thereof, the parties agree to try, in good faith, to resolve it as follows: (i) first, the parties agree
to engage in good faith negotiations to resolve the matter; (ii) second, if the parties are not able
to reach a mutually satisfactory solution, either party may request that the matter be submitted to
mediation in San Diego, California, in accordance with the Commercial Mediation Rules of the
American Arbitration Association (the "AAA").Both Consultant and District agree to
participate in the mediation in good faith with the intent to settle the dispute. The costs of
mediation shall be borne equally by the parties.
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H.Applicable Law/Venue.This Agreement shall be governed by and construed in
accordance with the laws of the State of California.Any action or proceeding brought by any
party against any other party arising out of or related to this Agreement shall be brought
exclusively in San Diego County.
XVII.Integration
This Agreement and the attached Exhibits represent the entire understanding by and
between the District and the Consultant as to those matters contained herein.No prior oral or
written understanding shall be of any force or effect with respect to those matters covered
hereunder. This Agreement may not be modified or altered except in writing signed by both
parties hereto.
XVIII.Execution
This person(s) executing this Agreement and any Exhibits hereto on behalf of the
Consultant warrant and represent that Consultant has vested authority on such person(s) to
execute and deliver this Agreement and to perform the services contemplated hereunder and that
this Agreement is valid and binding on Consultant.
This Agreement may be executed in multiple counterparts, each of which shall be
deemed an original, but all ofwhich, together, shall constitute but one and the same instrument.
Carollo Engineers,Inc.
Jeff/Thornbury,Vice-President
Jeff Wefshaar,Associate Vice-President
Otay Water District
Jqtfe Martinez,General Manager
APPROVED AS TO FORM
General Counsel
COPIES:D FILE(Orig),• CONSULTANT, • BINDER, • ENGSECRETARY
Page 10 of 22
H. Applicable Law/Venue. This Agreement shall be governed by and construed in
accordance with the laws of the State of California. Any action or proceeding brought by any
party against any other party arising out of or related to this Agreement shall be brought
exclusively in San Diego County.
XVII.Integration
This Agreement and the attached Exhibits represent the entire understanding by and
between the District and the Consultant as to those matters contained herein. No prior oral or
written understanding shall be of any force or effect with respect to those matters covered
hereunder. This Agreement may not be modified or altered except in writing signed by both
parties hereto.
XVIII.Execution
This person(s) executing this Agreement and any Exhibits hereto on behalf of the
Consultant warrant and represent that Consultant has vested authority on such person(s)to
execute and deliver this Agreement and to perform the services contemplated hereunder and that
this Agreement is valid and binding on Consultant.
This Agreement may be executed in multiple counterparts, each of which shall be
deemed an original,but all ofwhich,together,shall constitute but one and the same instrument.
Carollo Engineers,Inc.Otav Water District
JefMriornbury, Vice-President Jose Martinez,General Manager
JeffWeishaar,Associate Vice-President
COPIESD FILE(Ong I. D CONSULTANT. D BINDER. • ENGSECRETARY
Page 10 of 22
EXHIBIT A
SCOPE OF SERVICES
Project Management and Administration
The Consultant shall:
• Prepare and submit a detailed Project schedule using Microsoft Office Project or similar
software within two (2)weeks ofthe written Notice to Proceed for review and approval
by the District Project Manager.The schedule shall include durations and dependencies
for all tasks and subtasks defined in the Scope of Work. The schedule shall be updated
and resubmitted quarterly throughout the duration ofthe Project.
• Prepare and submit monthly invoices as detailed in the agreement.
• Meet with the District at five (5)meetings during the preliminary and final design phase
to discuss progress,resolve issues,review work products,and receive direction.Prepare
agendas and meeting minutes for all meetings.Electronically submit draft agendas and
draft minutes within five (5)working days before and after each meeting to the District
Project Manager for review and comment.
• Provide day-to-day communication and coordination with the District Project Manager.
This may be via telephone, e-mail or face-to-face meetings, as appropriate.
Agency Permitting and Utility Coordination
The Consultant shall:
• Determine and meet the permit requirements ofall the public agencies and private
utilities throughout the duration ofthe project. The Consultant shall prepare required
applicationsand all supporting documentation necessary for permits and utility services
for project implementation.
• Preparea summary permit work plan within three (3) months ofthe Notice to Proceed.
The plan shall identifyfederal, state, regional, local agencies, and private utilitiesthat
require permits for work during the planning, design, and construction phases, contact
information for those agencies, permit descriptions, and processing submittal schedules.
Known permits and coordination include but may not be limited to:
1) San Diego Regional Water Quality Control Board (SDRWQCB)
• Identifythe SDRWQCB permit application requirementsat the beginning ofthe process
by initiatingcontact with the Regional Boardand setting up a meeting with SDRWQCB
staffand District staff.
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• Review existing Master Reclamation Permit and related documents including the most
recent Engineering Report.
•Prepare a draft updated Title 22 Engineering Report and a Report of Waste Discharge
(ROWD)that includes the new disinfection system for review by District staff.
•After incorporating District staffcomments,prepare the final reports for District review.
Prepare a separate summary ofany changes there were made to the final Engineering
Report and ROWD.Finalize the reports for submittal to SDRWQCB following final
approval by the District.
•Submit final permit revision application packet to the District for required signatures and
then to SDRWQCB.
•Provide assistance to the District to respond to any SDRWQCB comments and questions
as required.Submit any revisions to the permit revision application packet as necessary.
•Assume four (4)meetings with SDRWQCB stafffor the permitting process.
The District will directly pay all required fees to the agencies or utilities.
Professional Surveying
The Consultant shall:
• Provide all professional surveying services required to supplement the existing District
survey ofthe site and support the final Project Contract Documents and all other Project
requirements.
•Coordinate with the District's Supervising Land Surveyor.
• All horizontal data (X,Y coordinates)shall be delivered using the California Coordinate
System (NAD 83, Zone VI, feet). All vertical data (Z coordinates) shall be delivered
using the North American Vertical Datum of 1988 (NAVD 88).
• Ground survey to locate surface features not visible in aerial survey. Ground survey
shall also include markings ofexisting utilities inside the delineated work areas.
Geotechnical Investigation
If a site geotechnical investigation is determined to be necessary, the District will contract the
work through one of its As-Needed geotechnical consultants. The District shall contract,
coordinate, and schedule geotechnical work. The Consultant will determine the required
scope ofwork for the geotechnical investigation and review oftheir work products.
Consultant will prepare the Contract Documents incorporating all recommendations in the
geotechnical report.
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•Verification of Existing Conditions
The Consultant shall:
•Provide and perform all required investigations to determine the location,elevation,
inclination,diameter,and alignment ofall existing facilities in and adjacent to the
Project site for preparation ofa complete and accurate set of Project Contract
Documents.Existing utilities shall include,but are not limited to treated water,raw
water,recycled water,wastewater,storm drain,gas,electric,telephone,cable television,
and fiber optic overhead and underground utilities.
•Engage the services ofa potholing contractor to locate existing utilities and at all points
ofconnection into existing systems near, over, under, along,adjacent,etc.ofthe new
proposed work that may conflict with the construction ofany or all portions ofthe
Project.Reliance upon the accuracy ofany as-built record drawings is not acceptable.
•Coordinate all potholing efforts with the District Project Manager,other appropriate
utilities,or agencies and obtain all required permits.
The District will provide existing reports,record drawings,and other related materials to the
Consultant that are in the District's possession.All such materials will be provided in the
format available (digital or non-digital).
•Environmental Documentation
The District will lead environmental work related to the project.The Consultant shall
coordinate with the District Project Manager throughout the duration ofthe CEQA
compliance effort. The Consultant shall prepare the Contract Documents incorporating any
and all required environmental mitigation and monitoring measures as may develop as the
Project CEQA requirements are accomplished.
•Preliminary Design Report Preparation
The PDR shall include the following major elements.The consultant shall:
• Identify all permitting requirements for acceptance ofthe proposed facilities by
SDRWQCB.
• Perform hydraulic modeling/calculations to (1) update the hydraulic profile for the
treatment plant between the filters and the effluent pump station and (2) develop system
head curves for filter backwash supply pumps.
• Perform a thorough evaluation ofthe treatment plant electrical system including standby
power.Confirm system ability to accommodate new electrical loadsfrom the proposed
equipment operating at all times.
Page 13 of 22
•Establish all electrical,control,and telemetry requirements for the primary disinfection
units,residual disinfection system,filter backwash supply pumps,and supporting
systems.
•Develop and recommend a concept for replacement ofthe filter backwash supply
pumps.
•Develop and recommend a concept for installation and operation ofan ultraviolet
disinfection system.
•Develop and recommend a concept for replacement ofthe chlorine gas disinfection
system with a sodium hypochlorite system to provide a chlorine residual in the post-
treatment recycled water and in the filter backwash water.
•Develop an understanding ofOWD SCADA preferences (e.g.;Instrumentation and PLC
preferences)to be incorporated into the final design.
• The PDR shall include preliminary construction cost estimates and projected
expenditure schedules for budgeting purposes
•Constructability Review
The Consultant shall use appropriate resources within its team to perform constructability
reviews after the 60%,and 90%submittal levels to ensure the Contract Documents are
biddable and buildable.The Consultant shall provide the recommendations ofthe team
resources in writing to the District Project Manager.
•Contract Documents Preparation
The consultant shall provide complete contract documents for the construction ofthe project.
Tasks shall include the following work and conditions:
• The Project design shall be based on the Preliminary Design Report as prepared by the
Consultant and approved by the District Project Manager. Any exceptions made
throughout the design process shall be documented as amendments to the Preliminary
Design Report and each approved by the District Project Manager.
• The Consultant shall provide all experts needed to provide complete bid documents
includingbut not limitedto the following primary disciplines with the exception of
project elements specifically excluded from this contract (geotechnical, environmental,
bid document distribution,construction management,construction inspection).
o Architectural
o Hydraulic modeling
o Potholing
o Survey
o Demolition
o Civil including but not limited to grading and roadway restoration
o Structural
Page 14 of 22
o Mechanical and HVAC
o Electrical,instrumentation and control,SCADA
o Cathodic Protection
o Coatings
o Constructability reviews
o All other disciplines required for a complete design
The Consultant shall prepare site grading plans showing all necessary finished grades,
ingress and egress for construction and maintenance purposes,all required storm water
and other drainage systems,and storm water erosion control requirements.The
Consultant shall estimate the earthwork volumes ofcut, fill,import,and export for the
Project and identify the nearest approved disposal location for export material or the
location for borrow material ifan import condition exists.The drawings and
specifications shall incorporate any and all recommendations contained in all the
environmental,geotechnical,Storm Water Pollution Prevention Plan requirements and
documents.
The Consultant shall prepare a complete equipment list for District review,comment,
and approval consistent with the typical materials and equipment preferences ofthe
District. The list shall identify any and all materials and equipment that may require a
long lead-time for delivery to the construction site. An evaluation ofequipment options
shall be provided,including operation and maintenance costs, for enabling selection and
pre-purchasing of long lead-time items.
The electrical and controls engineer must specify and design around District standard
programable logic controller (currently GE RX3i) programmed with logic which can be
edited by District staff.
The design drawings plan and section sheets shall be at appropriate scales and text sizes
per Water Agency Standards (WAS) utilizing District provided 22"x34"title block.
Detail drawing scales shall be as appropriate to properly convey the intent ofthe
Consultant.
The Consultant shall prepare Project design drawings,title sheet, and notes sheet
consistent with the District standard formats utilizing District provided 22"x34"title
block. The Project design drawings shall incorporate the typical practice that groups the
sheets into civil,mechanical,electrical,instrumentation and control,structural,
architectural, etc., organization. The Consultant shall prepare and submit a set ofProject
Contract Documents consisting ofdrawings and specifications using District computer
aided design (CAD) standards and Water Agency Standards (WAS). The drawings shall
be coordinated with the survey incorporating basis ofbearings, survey monuments, and
the District's standard survey monument preservation notes.
Project specifications shall be prepared in Construction Specifications Institute (CSI)
format using the provided District Contract Document procedural documents consisting
ofall "front end"specifications including bidding requirements, contract forms, and
conditions of contract.
Page 15 of 22
•
•
The Consultant shall transmit design submittals at the 60%, 90%, and 100%project
completion status. The timing ofdesign submittal component ofincluding but not
limited to drawings,specification outline,technical specifications,front end
specifications,calculations,and cost estimates have been outlined in the Deliverables
section ofthis Scope ofServices.
The Consultant shall be responsible for incorporating all comments within the Contract
Documents and communicating and coordinating all comments with the Consultant's
entire project team and sub consultants.
The Consultant's Project Manager,as the Engineer of Record for the Project, shall be a
California Registered Professional Civil Engineer and shall sign and seal each sheet.
Also, the Engineer of Record shall sign and seal the Specifications to be included in the
Contract Documents.In addition,the original mylar ofeach drawing shall be sealed by
a California Registered Professional Engineer having expertise in the discipline relating
to the content ofthe drawing. Each set ofthe final cost estimate shall be signed and
sealed by the Engineer ofRecord for the Project and the design computations shall be
signed and sealed by the Professional Engineer having expertise in the discipline relating
to the content ofthe drawing. The Consultants Engineer ofRecord shall also sign and
seal all the design computations for the Project.
The District Project Manager shall provide all written District comments to the Consultant's
Project Manager within three (3) weeks ofthe submittal.
The District will provide the Consultant with a list ofenvironmental mitigation and
monitoring measures for the Consultant to incorporate into the Contract Documents.
Bidding Assistance
The District will distribute bid documents to prospective bidders, publish the notice of
invitingbids, maintainthe plan holders list,and mail addenda. The District will coordinate,
schedule,and hold a pre-bid meeting with prospective bidders. The Districtwill reviewall
bids received for verification ofconformance to the Contract Documents and make
recommendations for award ofthe construction contract to the apparent lowest responsive
and responsible bidder.Verification will include reviewof theapparentlowbid proposal,
qualifications,references,listof subcontractors,bid bond,unitprice schedule,materials,etc.,
for conformance with the requirements ofthe Contract Documents. If significant non
compliancewiththe requirements of the ContractDocumentsis found,at the sole
determination and discretion ofthe District,the District will similarly verify the apparent
second low bid.The Consultant shall:
• Assist the District Project Manager during the bidding period to resolve technical
discrepancies and/or interpretations ofthe Contract Documents.
•Prepare and issueContract Document addendafor Districtreviewand approval to
amend and/or clarify the Contract Documents.
Page 16 of 22
•Construction Support
The Consultant may be required to perform the following construction support tasks.
• Attend and participate in the pre-construction conference and construction progress
meetings as-needed.
•Answer questions and resolve discrepancies related to technical interpretation ofthe
Contract Documents,commonly referred to as a Request for Information (RFI).
•Review the Contractor's shop drawing and other submittals for design intent and general
compliance with the Contract Documents.
•Prepare the necessary drawings,sketches,and specifications required to make changes
to the design,as approved by District staff, due to changed conditions encountered
during construction or as a result of a RFI or clarification from the Contractor and/or
material suppliers,to resolve design discrepancies or omissions,etc.The District will
not pay consultation fees related to the correction ofdesign errors or omissions.
•Attend and participate in construction progress meetings with District staffand the
Contractor at the construction site and/or District offices at the request ofthe District
Project Manager.
• Draft,review and sign offas Engineer ofRecord on as-built drawings.
•Optional Tasks
The Consultant may be required to perform the following optional tasks when requested by
the District. These tasks are not authorized until written approval oftheir initiation is
provided by the District. The District reserves the right to not perform the tasks or substitute
another task negotiated with the Consultant.
• Power Demand Support - Assist the District in performing a 30-day power monitoring
study ofthe plant and interpreting the data.
• Computational Fluid Dynamic (CFD) Modeling - Analyze the hydraulic approach to the
UV process reactors using CFD modeling and recommend design feature improvements.
• Checkpoint Bioassays - Perform series oftests on the installed UV process required for
regulatory approval including Spot-Check Bioassay Protocol and Testing plus Data
Analysis and Reporting.
DELIVERABLES
The Consultant shall provide deliverables including but not limited to deliverables listed in the
table and below and other files (e.g.;electronic photographs)developed for the project.
Electronic files shall be made available to District in digital formats in their native forms.
Page 17 of 22
Deliverable Description Hard Copies Electronic Copies
Project schedule None Microsoft®Office Platform,Adobe PDF
Agendas and minutes None Microsoft®Office Platform,Adobe PDF
Survey None AutoCAD .dwg
Pothole Report None Adobe PDF
Architectural Rendering None High resolution image file suitable for
presentations (e.g.;JPEG)
Draft PDR None Microsoft®Office Platform,Adobe PDF
Final PDR None Microsoft®Office Platform,Adobe PDF
60%design drawings,
technical specifications,
draft calcs,and cost
estimate
None Adobe PDF
90%design drawings,full
specifications,draft calcs,
and cost estimate
None Adobe PDF
100%design drawings,full
specifications,final calcs,
and cost estimate
None Adobe PDF
Final Design Drawings None AutoCAD .dwgs and bound Adobe PDF
file suitable for distribution via electronic
plan houses.
Final Design Specs None Microsoft®Office Platform and bound
Adobe PDF file suitable for distribution
via electronic plan houses.
Bid Addendum None Microsoft®Office Platform and AutoCAD
.dwgs bound Adobe PDF file suitable for
distribution via electronic plan houses.
Construction Support None Adobe PDF
Page 18 of 22
•"^™
EXHIBIT B
CONSULTANT'S FEE PROPOSAL
OttyWilMDumci
mvcvff DMKKUonS»«t»cTi ImpowanI—<—l andFa*Eaaknato
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4 %364000 1 57300 8 ST20O a 8 212
1 3 iPrrwirl ff^Hft*|4 a a i«4aoo a • -*4 00 a io4oc>a 1 7S2
T 4 Fitihj•• •U^tuiiru R*vn>«t*rua 4^-u.t.!^fl a 2BOOOO a aoaoo a 2oaoo a i ooe
2e a s.aaooo a 36400 8 lOOOOO a -i 354
ButOiWl T-.K 1 2*M:M 14 4 4 a 22 *oa • M J sao«j j^^^^jajja ^^^jaajic^a 28884
2 4 6 a 1 32000 a ?a00 a 7800 8 1 388
22 F«.:^l-«PW.2 a 3.624oo a 26600 a 28600
2 10 a 2.00000 a taooo a 13000
S3 Dj-n ~in 22 R*njt*i 4 a 36 a •a *712DO a 72600 a 7280O a 100000 a 11440
4 24 a 4.30400 a 31200 a 11200 a 1 00000 a &,aia
4 a 4 16 a 2 32800 a 20600 1 2\m00 i iS*
a 2.4aaoo a -saoo a isaoo 8 I.OOaOO a 3844
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12 a a aa a 15,73aoo a 1 '440D a 11*400 a &36C
sa «4 24)a 40 a eaoaoo a 52000 1 :.'J i>j a soooo 8 7B26
kubtoWTM*8 a 38 *4 204 »4 iu ..i*44B a a3.saa.aa a &w.a>a a,T88-no a aaoojoo a aaaaa
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Page 19 of 22
EXHIBITC -Sample Invoice Format (Summary)
INVOICE SUBMITTED TO:
Engineering Department
Otay Water District
2554 Sweetwater Springs Boulevard
Spring Valley,CA 91978-2004
JOB DESCRIPTION:
Project Name:Title
OWD Project Manager:Name
CIPNo:
DATE OF INVOICE:
INVOICE NO.
AUTHORIZATION:
Purchase Order Number:
Consultant Project Number:
DESCRIPTION OF SERVICES RELATED TO INVOICE:4/1/xx to 5/1/xx
Perform Construction Management and Inspection services and attend meetings.
AUTHORIZED AND INVOICED FEE:
Original Fee Amount Authorized
Change Order No. 1 Amount Authorized
Total Fee Amount Authorized
Amount ofThis Invoice
Amount Previously Invoiced
Total Amount Invoiced to Date
$175,000.00
$1,600.00
$176,600.00
$5,433.00
$32,456.00
$37,889.00
Amount Previously Paid $32,456.00
Authorized Fee Amount Remaining $138,711.00
Percent Complete 21%
CONTRACTED DATE OF PROJECT COMPLETION:June 30,20xx
Invoice has been reviewed and found correct.
[Name],Project Manager Date
FOR OWD USE ONLY
Amount ProjectNo.Project Account No.
TOTAL
OWD Project Manager Date Div Mgr Date Chief Dat
Page 20 of 22
EXHIBIT C
Sample Invoice Format (Task Detail)
Otay Water District
MM/DD/YY
DESCRIPTION
Project Title
CIP PXXXX-OOXXXX
THIS INVOICE INVOICED CONTRACT
TO DATE AMOUNT
TOTAL %
HRS/$'s RATE
PROJECT TOTAL
TASK I -Project Management and Administration
Sub-Task 1.1 Data Acquisition
Project Manager Smith
Drafter William
Secretary Allred
16.0 hr 41.00 $/hr
5.0 hr 35.00 $/hr
6.0 hr 20.00 $/hr
Sub-Task 1.2 Report Preparation
Principle James
Project Manager Smith
Drafter William
Secretary Allred
Direct Expenses
Reproduction
Subconsultant #1
Subconsultant #2
B&K
CEW
2.5 hr 95.00 $/hr
4.0 hr 41.00 $/hr
14.0 hr 35.00 $/hr
2.0 hr 20.00 $/hr
$17.50
$640.50
$1050.00
10%
0%
0%
TASK 2 -Review Existing Documentation &Related
Proj. Info.
Sub-Task 2.1
Project Manager Smith
Drafter William
Secretary Allred
Direct Expenses
Reproduction
Subconsultant#2 CEW
16.0 hr 41.00 $/hr
5.0 hr 35.00 $/hr
6.0 hr 20.00 $/hr
$120.00
$630.00
10%
0%
AMOUNT BILLED COMPLE
TE
$5,763.35 $20,884.30 $46,500.00 45%
$3,955.25 $15,420.90 $20,600.00 75%
$951.00 $2,944.00 $3,000.00 98%
$656.00
$175.00
$120.00
$931.50 $8,865.00 $13,000.00 68%
$237.50
$164.00
$490.00
$40.00
$1,884.50 $2,431.00 $3,000.00
$19.25
$640.50
$1,050.00
81%
37%
88%
100%
75%
81%
$1,808.10 $5,463.40 $15,700.00 35%22%
$951.00 $2,944.00 $12,000.00 25% 22%
$656.00
$175.00
$120.00
$762.00 $2,225.00 $2,500.00 89%89%
$132.00
$630.00
Note: 1)Consultant to edit,update,and add lines as necessary.
2) Rates shown above are to remain in effect throughout the life ofthe contract
Page 21 of 22
EXHIBIT D
Insurance Certificate
ACORlf CERTIFICATE OF LIABILITY INSURANCE OATEIMMrtWYYYY)
THIS CERTIFICATE IS ISSUED AS A MATTER OF INFORMATION ONLY AND CONFERS NO RIGHTS UPON THE CERTIFICATE HOLDER.THIS
CERTIFICATE DOES NOT AFFIRMATIVELY OR NEGATIVELY AMEND.EXTEND OR ALTER THE COVERAGE AFFORDED BY THE POLICIES
BELOW.THIS CERTIFICATE OF INSURANCE DOES NOT CONSTITUTE A CONTRACT BETWEEN THE ISSUING INSURER(S).AUTHORIZED
REPRESENTATIVEOR PRODUCER.ANDTHECERTIFICATE HOLDER.
IMPORTANT:Ifthe certificate holder is an ADDITIONAL INSURED,the policy(ies)must have ADDITIONAL INSURED provisions or be endorsed.
If SUBROGATION IS WAIVED,subject to the terms and conditions of the policy,certain policies may require an endorsement.A statement on
thiscertificatedoes not confer rights to the certificateholder in lieu of such endorsement(s).
PRODUCER CONTACT
NAME
PHONEl*JC.No.Ex
FAX
l:(AIC.No]:
EMAIL
ADDRESS:
!NSURER<S)AFFORDINGCOVERAGE NAlC «
INSURERA •
INSURED INSURER 8
INSURERC
INSURER D
INSURER E
INSURER F
COVERAGES CERTIFICATE NUMBER:REVISION NUMBER:
THIS IS TO CERTIFY THAT THE POLICIES OF INSURANCE LISTED BELOW HAVE BEEN ISSUED TO THE INSURED NAMED ABOVE FOR THE POUCY PERIOD
INDICATED NOTWITHSTANDING ANY REQUIREMENT.TERM OR CONDITION OF ANY CONTRACT OR OTHER DOCUMENT WITH RESPECT TO WHICH THIS
CERTIFICATE MAY BE ISSUED OR MAY PERTAIN,THE INSURANCE AFFORDED BY THE POLICIES DESCRIBED HEREIN IS SUBJECT TO ALL THE TERMS.EXCLUSIONS AND CONDITIONS OFSUCH POLICIES LIMITS SHOWN MAY HAVE BEEN REDUCED BYPAID CLAIMS
MS*
kIS_TYPEOF INSURANCE
X COMMERCIALOENERALLIABILITY V
CLAIMS-MADE X OCCUR
CfWL AGGREGATE LIMIT APPLIES PER
policy X UePf _] loc
OTHER
AUTOMOBILELIABILITY
X ANYAUTO
OWNED
AUTOSONLY
HIREDAUTOSONLY
SCHEDULED
AUTOS
NON-OWNED
AUTOSONLY
POLICYNUMBER
EACHOCCURRENCE
DAMAGETO RENTED
LIMITS
$1,000,000
LY INJURY(Per accident)%
i
UMBRELLALIAB
EXCESSLIAB
NOTE:ENDORSEMENTSARE REQUIRED AND MUST BE ATTACHED TO
^COMPLETE THE INSURANCE REQUIREMENT COVERAGE.
PEP RETENTION5
WORKERSCOMPENSATION
ANDEMPLOYERS LIABILITY
ANYPROPRIETOR/PASTNERCXECUTIVE
OFFICERiMEMSEREXCLUDED"
(Mandatory in NH)
Ifye*,describeunderDESCRIPTIONOFOPERATIONSbelow
Q
iProfessional Liability
' v 'PER 3Th-A STATUTE ER
E L EACHACCIDENT %
EL DISEASE•EAEMPLOYEE^S
E L DISEASE•POLICYLIMIT S
Gen Aggregate
lEach Claim
1,000,000
1,000,000
1,000,000
DESCRIPTIONOFOPERATIONSiLOCATIONS/VEHICLES (ACOR0101,AdditionalRemarksSchedule,may be machedifmore spaceisrequired)
CIPProject
Otay Water District,its officials,and employees are named additional insured on primaryand non-contributory basis, per
attached endorsements with respectto General Liability and Automobile Liability
CERTIFICATE HOLDER CANCELLATION
Otay Water Distnct
C/O:myCOl
1075 Broad Ripple Ave Suite 313
Indianapolis.IN 46220
SHOULD ANYOF THE ABOVE DESCRIBEDPOLICIES BE CANCELLEDBEFORE
THE EXPIRATION DATE THEREOF,NOTICE WILL BE DELIVERED IN
ACCORDANCEWITHTHE POLICYPROVISIONS,
AUTHORIZEDREPRESENTATIVE
>1988-2016 ACORDCORPORATION.All rights reserved.
The ACORD name and logo are registered marks ofACORD CONSULTANT SAMPLEACORD25(2016/03)
X1VERAGE LIMITiSI MAY VARY PEP CONTRACT
Page 22 of 22
FIRST AMENDMENT TO AGREEMENT BETWEEN OTAY WATER DISTRICT AND CAROLLO ENGINEERS, INC. RELATIVE TO PROFESSIONAL ENGINEERING SERVICES FOR RWCWRF DISINFECTION SYSTEM IMPROVEMENT
This First Amendment ("Amendment") to the Original Professional Services Agreement
is made and entered into as of the I S'� day of M CA..,Y , 2023, by and between
OTAY WATER DISTRICT ("District"), and CAROLLO ENGINEERS, INC., a California
corporation, ("Consultant").
A.District and Consultant entered into that certain Agreement for Professional
Services dated July 21, 2021 (the "Original Agreement"), under which Consultant agreed to
provide the services therein described in connection with the District's Ralph W. Chapman
Water Reclamation Facility (RWCWRF) Disinfection System Improvement Services (the
"Services").
B.The Original Agreement is due to expire on June 30, 2023, and the Services are
about 66% complete.
C.District and Consultant desire to enter into this Agreement to extend the term for
completion of the Services and to amend certain specific terms and conditions of the Original
Agreement as indicated below.
NOW, THEREFORE, in consideration of the foregoing and the mutual promises and
covenants hereinafter contained, the parties agree as follows:
1.Pursuant to the Original Agreement, the parties agreed that the Services would
be completed on or prior to June 30, 2023. The parties hereby agree that the term of the
Page 1 of 2
ATTACHMENT D
Original Agreement is extended to June 30,2025 and all Services and work contemplated under
the OriginalAgreement shall be completed to the District's satisfaction on or prior to that date.
2. The parties agree that all terms and conditions of the Original Agreement not
modified or amended by this Amendment, including without limitation all indemnity and
insurance requirements, are and shall remain in fullforce and effect.
3. This Amendment is subject to the venue, choice of law and interpretation
provisions of the Original Agreement.
lN WITNESS WHEREOF, the parties have caused this Amendment to be executed as of
the day and year first above written.
OTAY WATER DISTRICT
By:
Its:
ose
General Manager
Date:
CONSULTANT
CAROLLO ENGINEERS, lNC., a California
Corporation
By:
Name:
Its:
Date:
Digitally signed byddfrdy A. Wtishaar. IConlâct lnfo: Cârdlo¡Edgineertllnct r I .?,,.f
Dâre: 2023.0a.1y'¡-ll$fåSo7&' L' (ltut L"*'"rt
Jeff Weishaar
Vice President
April 17,2023
App
By:
roved as to rm
Gen Counse
Approved as to form:
By
Its
Page 2 of 2
SECOND AMENDMENT TO AGREEMENT
BETWEEN
OTAY WATER DISTRICT
AND
CAROLLO ENGINEERS, INC.
RELATIVE TO
PROFESSIONAL ENGINEERING SERVICES FOR
RWCWRF DISINFECTION SYSTEM IMPROVEMENT
This Second Amendment ("Amendment") to the Original Professional Services
Agreement is made and entered into as of the IO Oay of J c^np ,2024, by and between
OTAY WATER DISTRICT ("District"), and CAROLLO ENGINEERS, lNC., a California
corporation, ("Consultant").
REeITALS
A. District and Consultant entered into that certain Agreement for Professional
Services dated July 21,2021 (the "Original Agreement"), under which Consultant agreed to
provide the services therein described in connection with the District's Ralph W. Chapman
Water Reclamation Facility (RWCWRF) Disinfection System lmprovement Services (the
"Services").
B. The Original Agreement was amended on May 1,2023 (the First Amendment to
the Original Agreement) to extend the Original Agreement to June 30,2025.
C. ïhe OriginalAgreement is in the amount of FOUR HUNDRED FIFTY EIGHT
THOUSAND THREE HUNDRED SEVENTY FOUR DOLLARS ($458,374.00) , and the Services
are about 77o/o complete.
D. District and Consultant desire to enter into this Second Amendment to increase
the compensation to Consultant for the additional services in design and construction services.
NOW, THEREFORE, in consideration of the foregoing and the mutual promises and
covenants hereinafter contained, the parties agree as follows:
Page I of 3
ATTACHMENT E
1. Exhibit A to the Original Agreement and the First Amendment, setting forth the
Services to be provided by Consultant, is hereby amended and supplemented by the Consultant's
letter proposal dated May 13, 2024, attached to this Amendment and incorporated herein by
reference.
2. The parties agree that the aggregate amount paid by the District to the
Consultant for the Services rendered by Consultant in excess of the Original Agreement, as
amended by the Second Amendment, shall not exceed Seventy Four Thousand One Hundred
Ninety - Five Dollars ($7+,195). Accordingly, the total compensation paid by the District for
Services described in the OriginalAgreement, as amended by the Second Amendment, shall
not exceed Five Hundred Thirty-Two Thousand Five Hundred Sixty-Nine Dollars ($532,569).
3. The Parties Agree that all terms and conditions of the Original Agreement not
modified or amended by this Amendment, including without limitation all indemnity and
insurance requirements, are and shall remain in fullforce and effect.
4. This Amendment is subject to the venue, choice of law and interpretation
provisions of the Original Agreement.
Page 2 of 3
lN WTNESS WHEREOF, the parties have caused this Amendment to be executed as of the
day and year first above written.
OTAY WATER DISTRICT
By
MartinezIts: General Manager
Date:
CONSULTANT
CAROLLO ENGINEERS, lNC., a California
Corporation
D¡g¡tally
Coñtrct
Date:
By
Name: Jeff Weishaar, P.E.
Its: Vice President
Date:
as to
By
GeneralCo un
Approved as to form
By
Its:
Paqe 3 of 3
Engineers...Working Wonders W¡th Water@
5355 MÌra Sorrento Place, Suite 270, 5an D¡ego, Cal\fornia 92'12I
P. 858.505.1020 F. 858.505.1015
May 13,2024
Mr. Lito Santos
Otay Water Disnict
25554 Swee¡vater Spdngs Blvcl
Spring Valley, CA 91978
Subject: Disinfection System Improvements Project Amendment 1 Request
Dear Mr. Santos:
Carollo Engineers, Inc. (Carollo) has been assisting the Otay'\ùØater District (District) with installation of a new
ultraviolet clisinfection system at the Ralph A Chapman \Øater Reclamation Facility. The project has completecl
clesign ancl is currently under construction. This letter provicles our request for aclclitional funcls to support
District requestecl aclclecl support cluring construction as well as aclclecl effort cluring the clesign phase that has
been agreecl to as out of scope work. Details of each are proviclecl below.
Additional Design Work
Carollo providecl additional design clrawings to support the project overall scope. This was performecl at the
District's request. Aclclitional work incluclecl preparing clrawings ancl specifications for addition of a roll-up cloor
in the chemical storage room, aclclitional lighting changes in the chemical storage room ancl arouncl the new UV
area, ancl moclifiring the HVAC system in the chemical storage area.
Additional Construction Services
Our initial scope incluclecl minimal constructiolr services support. Changes at the District have resulted in a
request to expancl those services for the cluration of construction.
Shop Drawing Review
Our current scope inclucles review of approximately 20 shop clrawings. As of May 9, we have reviewecl 100 shop
clrawings. In aclclition, we expect approximately more shop clrawings reviews to help support construction. 'We
are requestirìg aclclitional fee to cover the extra shop clrawings reviewed ancl allow for aclclitional shop clrawing
reviews uncler the revisecl buclget.
Requests for Information
Our current scope inciucies review oí i5 requests for information (RFi) írom the contractor. As oí May 9, we
have rêviewecl 20 RFIs. In aclclition, we anticipate more RFIs will be sent in as the contractor has recently
mol¡ilizecl on site ancl began the work. \Øe are requesting aclclitional fee to cover aclclitional RFI's expectecl.
FEE ESTIMATE
The amachecl Exhibit A includes a summary of the cost associatecl with the scope of work clefinecl herein.
\Øe appreciate the opportunity to continue to work with the Disrrict. Please contact us clirectly with any
questions or comments regarcling this proposal.
I,YATER
OUR FOCUS
OUR BUSINESS
OUR PASSION
Mr. Lito Santos
Otay Water District
May 13,2024
Page z
Sincerel¡
CAROLLO ENGINEERS, INC.
Jeff \ùTeishaar, P.E.
Project Manager
J\7:jw
Enclosures; FeeProposal
cc: File
carollo.com
Otay Water D¡strict
RWCWF Ois¡nfection System lmprovement
Amendment 1 Fee Propo3al Eng¡neøß--.Wotulng Wonders W¡th Watet "
lasks Role:
Billino Ratê l$/hrì:
Task SublotalsFt&c CAD Total
Houß Carollo Labor
Cost PECE @ $ihr
$15 00s?71 s2¡o s21 0 s172 s195 sl 95 sl55 sl 10
2 10 s 2 1ÀO OO $ 150 00 2 290
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OTAY WATER DISTRICTRALPH W. CHAPMAN WATER RECLAMATION FACILITYDISINFECTION SYSTEM IMPROVEMENTSLOCATION MAP
EXHIBIT A
CIP R2117CIP R2157
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C:\Users\donald.bienvenue\Otay Water District\ENG CIP - Documents\R2117 RWCWRF Contact Basin Expansion Project\Graphics\Exhibits-Figures\Exhibit A.mxd
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