1 Hetch Hetchy Capital Improvement Program
Q4 | FY 2023
–
2024
September 24, 2024
Katie Miller, Director
Water Capital Programs
Infrastructure Division
Planning (7),
$322M
Design (2),
$42M
Bid & Award (0), $0
Construction (3),
$284M
Closeout (1),
$38M
Completed
(0), $0
Multiple Phase
(4), $285M
Not Initiated (0),
$0
$971M
(17 Projects)
* Excluded 3 Project
Development Accounts ($61M)
Project Count by Phase*
HCIP Program Status (as of June 2024)
36%
% Complete
Expenditures
$339M $694M
Expenditures
Expended Remaining
HCIP Program Cost Summary
(from Table 3)
3 Program Name
Expenditures
to Date
($Million)
Expenditures
During Q3-Q4
($Million)
Current
Approved
Budget
($Million)
Current
Forecasted
Cost
($Million)
Cost
Variance
($Million)
Cost
Variance
in Q4
($Million)
Water
Infrastructure $43 $16 $149 $171 $22 $0
Power
Infrastructure $106 $10 $192 $266 $74 $13
Joint
Infrastructure $189 $23 $692 $1,112 $420 $0
Overall HCIP $339 $49 $1,033 $1,548 $516 $13
HCIP Budget and Schedule Variances
4 • Previous Quarters’ variances match approved FY2025- 2034 10-Year CIP
• New approved project budgets and schedules will be
updated to match FY25-34 10-Year CIP in Q1 FY24-25
• One new cost variance during Q4:
• Moccasin Powerhouse and GSU Rehabilitation Project
• $13M forecasted cost increase for Subproject C: Systems Upgrade
• Scope refinement, phasing, complexities during final design phase.
San Joaquin Pipelines (SJPL) Valve and
Safe Entry Improvement
5 Progress and Status:
Phase 1A & 1B Contracts (Tesla and
Oakdale Entry Improvements):
• Significant pipeline and valve
installation during Q3 system shutdown
(Dec 5, 2023 - Mar 13, 2024).
• Corrective action for 42-inch valves.
Phase 2 (Pelican, Roselle, Emery):
• Contract 2A: Notice to Proceed in May.
• Contract 2B: 95% design achieved.
Phase 3 (Tesla Surge Tower):
• Notice to Proceed Feb 26.
• Procurement valves, long lead items.
Approved Budget: $140.7M (Forecast +$17.1M)
Approved Completion: March 2028 (Forecast +352 days)
Current Phase: Multiple Phases
Expended to Date: $37.9M
Phase 1B Final Testing Installed Valves
Moccasin Powerhouse and Generator
Step-Up Transformer Rehabilitation
6 Progress and Status:
A) Step-Up Transformers: Completed
B) Generators Rewind:
• New Generator M2 reassembly
completed March, testing and
partial utilitzation by May.
• Initiated Generator M1
rehabilitation work.
C) Powerhouse Systems Upgrade:
• Draft 65% design complete.
• $13M higher cost forecast than Q1
due to greater design detail, market
pricing, and phasing requirements.
Approved Budget: $66.7M (Forecast +$47.3M)
Approved Completion: Dec 2027 (Forecast +394 days)
Current Phase: Multiple Phases
Expended to Date: $44.1M
Setting Up Generator M2 for Commissioning
O’Shaughnessy Dam Outlet Works
Phase 1
7 Progress and Status:
A) Bulkheads:
• Progressive Design-Build contract DB-
135 completed final design.
• Bulkhead fabrication trade package
awarded.
B) Drainage: Bids opened in June.
C) Instream Flow Release Valves:
• Construction started; existing piping
removed; new 36-inch valves installed
during shutdown.
D) Slide Gates & E) Drum Gates:
• Needs Assessment continued.
Approved Budget: $47.9M (Forecast -$4.3M)
Approved Completion: Sept 2025 (Forecast +105 days)
Current Phase: Multiple
Expended to Date: $15.8M
New 36-inch Gate Valves in OSH Diversion Tunnel
Mountain Tunnel Improvements
8 Progress and Status:
• Successful Shutdown No. 3 Dec
5, 2023- Mar 11, 2024 .
• Tunnel lining repair 72% of lined
tunnel length.
• Contact grouting for 23% of
length.
• Completed access stairs for
150-deep Priest shaft.
• Moccasin Water Treatment
Plant contract awarded May.
• Discussions continue for best
means to complete work at
South Fork site.
Approved Budget: $238.2M (Forecast +$30.5M)
Approved Completion: June 2027 (Forecast +0 days)
Current Phase: Construction
Expended to Date: $139.7M
Priest Adit with Concrete Invert Paving
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HCIP Quarterly Report Q4-FY2023-2024 (04/01/24– 06/30/24) * Negative number is reflecting cost increases since last quarter, and positive number is reflecting cost reduction since last quarter.
Table B shows a variance of 30 months between the Approved and Forecast Completion Dates.
Reasons for individual project schedule variances are included in Section 7 of this report.
* “A” is used after a date to represents an actual date as opposed to a forecast or approved date.
Program Key Updates:
The key updates for the HCIP include:
x The SJPL Valve and Safe Entry Improvements Phase 2A (contract HH-1012) contractor received Notice to Proceed in May. The Phase 2B/2C 95% design was completed in May. x For the Moccasin Powerhouse Bypass Upgrades project, the 35% design review is complete. x For the Moccasin Powerhouse and Generator Step-Up (GSU) Rehabilitation project, during this quarter, the contractor for Subproject B (contract DB-121R2) completed Generator M2 Dry and Wet Commissioning in April, and partial utilization of Generator M2 was allowed in May. For Subproject C, the 65% design package was received in May and is under review. x For the Warnerville Substation Rehabilitation – Phase 2 project, a 100% design package has been submitted and is currently under review. PG &E is currently reviewing the 95% design package.
x For the Moccasin Switchyard project, a planning kick-off meeting was scheduled for July with the design team and consultant.
x For the Transmission Lines 7/8 Upgrades project, the project achieved Final Completion on June 5. All work has been completed and final project documentation and approvals are in process.
Table A. Program Cost Summary
Program
Expenditures
To Date
($ Million)
(A)
Current
Approved
Budget
($ Million)
(B)
Q4/FY23-24
Forecast
Costs
($ Million)
(C)
Cost
Variance
($ Million)
(D = B - C)
Cost Variance
Over
Reporting
Period *
($ Million)
(E)
Program Total $338.60 $1,032.55 $1,548.09 ($515.54) ($13.48) Table B. Current Approved vs. Current Forecast Schedule Dates
Program
Current
Approved
Project
Start
Actual
Start
Current
Approved
Completion
Current
Forecast
Completion
Schedule
Variance
(Months)
Overall
HCIP Program 10/03/11 10/03/11 A* 06/30/33 12/31/35 30 (Late) iii
HCIP Quarterly Report Q4-FY2023-2024 (04/01/24– 06/30/24) x For the Moccasin Penstock Rehabilitation project, the Independent Technical Review was completed and the comments were incorporated into the draft Alternative Analysis Report. x For the Moccasin Engineering & Records Building project, the Conceptual Design was completed in June.
x For the O’Shaughnessy Dam Outlet Works Phase 1 project, the contractor for Subproject A (contract DB-135 for bulkheads rehabilitation) completed the design phase; bids for the construction trade packages are being pursued by the DB-135 contractor. For Subproject B (contract HH-1015 Drainage & Miscellaneous Dam Improvements), the drawings, specifications, and construction bid package for the improvements were finalized for advertisement, and bids were opened on June 20. For Subproject C (contract HH-1011 Instream Flow Release Valve Replacement), the pre-construction JOC contract work was completed. The main contract work made significant progress during the system outage including successful installation of two new knife gate isolation valves.
x For the Moccasin Dam & Reservoir Long-Term Improvements project, the draft Conceptual Engineering Report was issued to staff and project stakeholders for review and comments on June 21.
x For the Cherry Dam Spillway - Short Term Improvements project, the project team completed a combined Alternatives Analysis-Conceptual Engineering Report, and design phase will start in July 2024.
x For the Mountain Tunnel Improvements Project (contract HH-1000), during this quarter, construction work focused on completing the access stairs for the 150-foot deep Flow Control Facility shaft; continuing work on the concrete invert slab in the Priest Adit and continuing excavation and support of the large cut wall near Adit 8/9. Contract HH-1013 (Moccasin Water Treatment Plant) was awarded on May 14. Discu ssions are taking place on alternative delivery methods to complete the required improvements at South Fork. x For the Bridge Replacement project, for the Lake Eleanor Dam Bridge project, the combined draft Alternative Analysis Report – Conceptual Engineering Report for the interim repair was completed. For the O’Shaughnessy Adit Access Bridge, the project team completed the 65% design.
x For the Moccasin Wastewater Treatment Plant Replacement (contract HH-1010) project, the contractor received construction Notice to Proceed in June.
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3 HClP Quarterly Report Q4-FY2023-2024 (04/01/24 – 06/30/24)
3. PROGRAM COST SUMMARY
Table 3 provides an overall cost summary of the 17 HCIP projects and 3 HCIP PD accounts at the end of the quarter. It shows the Expenditures to Date, Current Approved Budget, Current Forecast Cost, the Cost Variance between the Approved and Forecast Costs, and the Cost Variance Over the Reporting Period (difference between cost forecasts reported in Q3/FY23-24 and in Q4/FY23-24). The Current Approved Budget and Forecast Cost for the HCIP are $1,032.55 million and $1,548.09 million, respectively.
The overall 2023 HCIP negative Cost Variance of $515.54 million in Table 3 can be attributed to the following projects and PD accounts, and their varianc es are provided below. All but one of these variances were included as revised budget requests that were submitted to the Commission in early 2024 and were adopted by the Commission on February 13, 2024 as part of the FY25-24 10-Year CIP.
The one new variance this quarter is a $13.48M cost increase on the Moccasin Powerhouse and GSU Rehabilitation project. The revised budgets will be shown as the approved budgets beginning in the first quarter of FY24-25. The reasons for the project variances are reported in section 7:
x SJPL Valve and Safe Entry Improvement forecast cost increased by $17.09M. x Water Infrastructure Project Development forecast cost increased by $4.15M. x Moccasin Powerhouse and GSU Rehabilitation continuation of $33.84M negative variance from Q4 of FY22/23 and an additional forecast increase of $13.48M LQ)< for a total of $47.32M negativevariance.
x Moccasin Powerhouse Bypass Upgrades continuation of $13.28M negative variance from Q4 of FY22/23 and an additional forecast increase of $0.38M LQ)<for a total of $13.66M negative variance.
x Moccasin Switchyard Rehabilitation forecast cost increased by $9.97M x Warnerville Substation Rehabilitation continuation of $1.89M negative cost variance from Q4 of FY22/23 and an additional forecast cost increase of $1. 7M LQ )< for a total of $3.16M negative variance.
x Transmission Lines 7/8 Upgrades forecast cost decreased by $2.54M. x Power Infrastructure Project Development forecast cost increased by $2.28M. x Moccasin Penstock Rehabilitation forecast cost increased by $283.92M. x Moccasin Engineering and Records Building forecast cost increased by $28.01M. x Early Intake Dam - Long Term forecast cost increased by $11.33M. x Moccasin Dam & Reservoir Long-Term Improvements forecast cost increased by $69.01M. x Cherry Dam Spillway - Short Term Improvements forecast cost decreased by $9.97M. x O'Shaughnessy Dam Outlet Works Phase I forecast cost decreased by $4.25M. x Mountain Tunnel Improvement Project forecast cost increased by $30.45M. x Moccasin Old Powerhouse Hazard Mitigation forecast cost decreased by $3.93M. x Bridge Replacement (2 Bridges) forecast cost decreased by $24.18M. x Canyon Tunnel - Hetchy Adit Rehabilitation forecast cost increased by $15.15M. x Moccasin Wastewater Treatment Plant forecast cost increased by $3.35M. x Joint Infrastructure Project Development forecast cost increased by $21.550. 4 +&O34XDUWHUO\5HSRUW 4)<
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Approved
Budget
Approved
Completion
Forecast
Cost
Forecast
Completion
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Cost
Forecast
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ab c d e f g h i j k l m n
Water Infrastructure
10035575 - SJPL Valve and Safe Entry Improvement
Phase 1A
Phase 1B
Phase 2A
Phase 2B/2C
Phase 3
Power Infrastructure
$27.4 12/01/27 $15.0 12/01/27 $40.7 12/01/27 $41.1 12/01/27 TBD TBD TBD TBD $41.1 12/01/27 10014086 - Moccasin Powerhouse and GSU Rehabilitation
Phase 1
Phase 2
Phase 3
10014087 - Warnerville Substation Rehabilitation
Phase A - DB-127R
Phase B - Contingency Plan
Phase C - HH-1008
$9.7 11/30/28 $9.7 11/30/28 TBD TBD TBD TBD TBD TBD TBD TBD $19.7 01/31/30 Joint Infrastructure
$47.3 02/28/28 $13.2 12/31/24 TBD TBD TBD TBD TBD TBD TBD TBD $331.2 12/08/34 $60.7 06/30/31 $60.7 06/30/31 $88.700 05/31/29 $88.700 05/31/29 $88.700 05/31/29 $88.700 05/31/29 $88.7 05/31/29 Q4 - FY23-24
10039568 - Moccasin Switchyard Rehabilitation
FY24-33 11/01/22 05/31/25 11/30/25 09/30/26 06/30/27
10039680 - Moccasin Engineering and Records Building4
FY24-33 12/14/22 05/31/24 08/30/24 04/30/26 07/22/26
Q4 - FY23-2409/03/26 03/05/27 03/02/29
Q4 - FY23-24
$114.0 12/31/2812/03/2712/03/2712/31/28
11/25/26
04/13/27
02/29/16 (Phase A),
04/29/22 (Phase B) &
04/28/23 (Phase C)
04/01/16 (Phase A),
01/18/21 (Phase B) &
06/30/23 (Phase C)
12/24/16 (Phase A),
08/16/21 (Phase B) &
03/20/24 (Phase C)
5/23/17 (Phase A),
N/A (Phase B) &
02/28/25 (Phase C)
Q4 - FY23-24
11/25/26
$66.7 $100.6 $66.7
FY24-33 01/04/16
$66.7
04/13/21 (Phase 1),
05/11/21 (Phase 2) &
10/31/25 (Phase 3)
03/05/31
$66.7
10014088 - Moccasin Penstock Rehabilitation
FY24-33 02/01/16
FY24-33
09/01/15 (Phase A),
07/01/20 (Phase B) &
01/01/21 (Phase C)
$27.2$34.2 11/25/26
12/03/27 $18.0 10/03/18
05/14/21
07/29/19 (Phase 1),
10/01/19 (Phase 2) &
12/29/23 (Phase 3)
09/09/20 (Phase 1),
05/11/22 (Phase 2) &
10/31/24 (Phase 3)
Most Recent CIP
Approved Budget
03/31/23 03/13/24 07/27/24
Project Name
FY24-33 09/18/20
10036809 - Moccasin Powerhouse Bypass Upgrades
$157.807/01/25
Project Initiation
Q4 - FY23-24
FY24-33
$157.8 02/28/29$95.3 07/01/25 $98.9 03/13/28
Current StatusCER Awarded Construction135% Design 95% Design Q4 - FY23-24
02/28/29 $157.8 02/28/29
07/01/19
07/14/21 (Phase 1A),
10/29/21 (Phase 1B),
06/08/23 (Phase 2A),
05/21/24 (Phase 2B/2C) &
03/31/23 (Phase 3)
03/08/22 (Phase 1A),
08/23/22 (Phase 1B),
02/27/24 (Phase 2A),
01/17/25 (Phase 2B/2C) &
01/09/24 (Phase 3)
$140.7 03/13/28 $95.3
Table 5. Budget and Schedule Trend Summary
$34.2 $34.2 $37.4 $37.4 $37.411/25/26 11/25/26 11/25/26 11/25/26 04/16/21
03/03/21 (Phase 1A),
05/28/21 (Phase 1B),
08/19/22 (Phase 2) &
12/30/21 (Phase 3)
Q4 - FY23-24
06/30/25
7 All Costs are shown in million
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Approved
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Forecast
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ab c d e f g h i j k l m n
Water Infrastructure
Most Recent CIP
Approved Budget
Project Name
Project Initiation Current StatusCER Awarded Construction135% Design 95% Design Table 5. Budget and Schedule Trend Summary
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10032903 - O'Shaughnessy Dam Outlet Works Phase I2
Subproject A
Subproject B
Subproject C
Subproject D (Planning Only)
Subproject E (Planning Only)
$73.2 06/30/28 $83.2 07/01/27 TBD TBD TBD TBD TBD TBD TBD TBD $142.2 12/29/34 $24.9 11/01/27 $11.9 07/01/27 $14.9 06/30/27 TBD TBD TBD TBD TBD TBD $14.9 06/30/27 $88.7 06/30/31 $88.7 06/30/31 TBD TBD TBD TBD TBD TBD TBD TBD $100.1 12/31/35 $238.2 06/03/27 $114.0 12/30/21 $246.1 12/31/26 $238.2 12/31/26 $238.2 12/31/26 $238.2 06/03/27 $268.7 06/03/27 $17.4 06/30/28 $12.2 01/31/25 TBD TBD TBD TBD TBD TBD TBD TBD $13.5 07/01/30 10035086 - Bridge Replacement (2 Bridges)
Subproject 1
Subproject 2
$15.0 12/30/26 $0.5 06/30/16 $15.0 12/30/26 $8.0 06/30/18 TBD TBD TBD TBD $30.1 12/31/30 $12.0 04/07/26 $8.8 04/07/26 - - $8.8 04/07/26 $12.0 04/07/26 $15.4 02/20/28 $15.4 02/20/28 Footnotes:
1. This represents forecast project cost and project completion date at the time of award of construction contract (or award of CM/GC or Design-Build contracts/packages).
2. This represents that Subproject A will be doing Progressive Design Build during Construction. Subproject B is in the process of finalizing the design. Subprojects D & E will not be doing CER.
3. This represents that the project started during the Design Phase.
4. This is a building project which follows a different set of milestones. Dates shown for CER, 35% Design, and 95% Design above are for Conceptual Design, Schematic Design, and Contract Document.
5. This represents the moving of design and construction scope for the bridge subprojects to projects 10014108 (Canyon Tunnel - Hetchy Adit Rehabilitation) and 10030759 (Eleanor Dam Rehabilitation).
6. Dates shown are for 50% Design and 100% Design.
Q4 - FY23-24
04/30/24 (Subproject A)6,
N/A (Subproject B) &
12/23/22 (Subproject C)
06/13/23 (Subproject A),
11/12/24 (Subproject B) &
06/13/23 (Subproject C)FY24-33 02/01/18
09/30/21 (Subproject A),
Complete (Subproject B),
09/30/22 (Subproject C),
N/A (Subproject D) &
N/A (Subproject E)
01/12/24 (Subproject A)6,
N/A (Subproject B) &
11/16/22 (Subproject C)
$48.0 $17.2 $47.909/17/25 $48.0 $48.0 $48.0
$29.4 $29.4 12/30/27 TBD TBD
$43.709/16/25 09/16/25 09/16/25 09/16/25
Q4 - FY23-24
FY24-33 10/03/11 12/29/17 05/15/18 07/31/19 10/13/20 Q4 - FY23-24 $44.3 12/30/25 TBD $5.2 07/01/2412/30/27
10014108 - Canyon Tunnel - Hetchy Adit Rehabilitation
10014114 - Mountain Tunnel Improvement Project
6/30/24 (Subproject 1) &
03/17/23 (Subproject 2)
10014110 - Moccasin Wastewater Treatment Plant3
FY24-33 01/03/22
FY24-33 02/27/20
Q4 - FY23-24
TBD
FY24-33
N/A (Subproject 1) &
N/A (Subproject 2)5
10037077 - Moccasin Old Powerhouse Hazard Mitigation
FY24-33 01/01/21 08/30/24 09/01/27 05/05/28 02/15/29 Q4 - FY23-24 N/A (Subproject 1) &
N/A (Subproject 2)5
N/A (Subproject 1) &
N/A (Subproject 2)5
TBD TBD
- 04/29/22 03/23/23
02/03/14 03/17/23 03/30/16 09/19/24 02/16/27 Q4 - FY23-24 02/27/24
10037351 - Moccasin Dam & Reservoir Long-Term
Improvements
FY24-33 05/03/21 08/30/24 12/31/25 12/30/27 12/04/29 Q4 - FY23-24 06/30/2612/31/24
10014115 - Cherry Dam Spillway - Short Term Improvements FY24-33 03/01/21 06/28/24 09/30/24 02/05/25 12/18/25 Q4 - FY23-24 10039119 - Early Intake Dam – Long Term
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32 Appendices
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Allow safe entry into all sections of SJPLs for inspection, maintenance, and capital improvements while the remainder of the system stays in operation. This project will allow for isolation of the pipelines to prevent a water engulfment ha ard during PermitI2euired Con³ned Space fP2CSg entry of a pipeline. )n addition, replacement of the butterfly valves TUV 201 through 401 inside Tesla Valve Vault will be completed under this project.
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The project provides programmatic support for Water funded capital projects. The following charges are allocated to the PD Account: 1) task orders for overall program management and project prioritization tasks, where the costs should be distributed over all CIP Projects; 2) infrastructure and Hetch Hetchy staff performing program-level tasks, including capital plan development, budget management (including fund management and cost reallocations), and uni ³er and uarterly report generation tasks, where the costs should be distributed over all CIP Projects; 3) portal support for the existing SharePoint Portal (including document management and project dashboard reporting); 4) work outreach program; and 5) City Attorney charges for contract development.
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Upgrade/replace high-pressure energy-dissipating valves, control systems, and associated structures to absorb 1,147 feet of pressure head and 430 cubic feet per second flow without damage. 0RFFDVLQ3RZHUKRXVHDQG*685HKDELOLWDWLRQ
The project is broken down into three components: 1) Generator Rehabilitation – replace the entire generator and associated equipment, including new stator cores and coils, rotor poles, relays, and rotor rim; 2) GSU Replacement – replace two of the three existing generator step-up transformers (GSUs), new foundations and oil containment, and relay upgrades; and 3) Power Plant Systems Upgrades – replace the 480 V switchgear, 13.8 kV switchgear, motor control centers, main control boards, protective relays, cooling water piping, and improving oil containment systems. 6ZLWFK\DUG 6XEVWDWLRQV
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Remaining work includes the replacement of four oil circuit breakers, bushings, surge arrestors, disconnect switches, current voltage transformer, insulators, relay protection, and other ancillary equipment. 0RFFDVLQ6ZLWFK\DUG5HKDELOLWDWLRQ
Replace 115 kV disconnect switches, replace 115 kV bus con ³guration, replace 230 kV disconnect switches, change 230 kV bus con³guration, replace 115 kV circuit breakers, add surge arresters, perform a fault study, perform a grounding study, improve switchyard grading, and replace fencing. 7UDQVPLVVLRQ/LQHV
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This project develops the scope of work, design, and contract documents necessary to bid, award, and manage the reconductoring contract. Reconductoring will include replacement of the existing 115 kV conductors on Lines 7/8 from Warnerville to Standiford substations, resulting in increased capacity and resolving clearance detections. The project is primarily funded by renewable generation developers interconnecting to the California electrical grid who have an adverse impact on Lines 7/8. Remaining funding will come from capital funds previously allocated to the Transmission Line Clearance Mitigation Project (10014089).
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The project includes rehabilitation of anchor blocks, penstock coating, penstock saddles, air valves, large Eiameter butterfly valves, bifurcation sections, and flow meters; and upgrade of electrical system, power transformers, the standby generator in the West Portal Valve House, and the bulkhead isolation valves in the surge tower.
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Construct a 25,000 square-foot, two-story building in the area currently occupied by Engineering, Records, and Energy Services trailers.
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O'Shaughnessy Dam (OSH) was completed in 1923 and raised in 1938. The original outlet works including gates and valves have been in services for more than 98 years. Inspections, condition assessments, and studies concluded that improvements and refurbishments of the outlet works system are needed to ensure safety and reliability. The work will be implemented in two phases. This project is to cover the Phase 1 work. The OYShaughnessy Dam Outlet Works Phase 1 Project addresses the identi ³ed de³ciencies of the existing outlet works system at OSH. Work under Phase 1 will include: (1) replacement of two existing instream flow release valves; (2) improvements to access and drainage in the dam gallery and stairs; (3) installation of new bulkheads for the outlet intake; and (4) a planning phase and scoping for the slide gates and drum gates improvements.
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A heavy storm event in 2018 caused signi ³cant damage to the auxiliary spillway, upstream trash rack and diversion, and downstream area. Subsequent engineering studies concluded that improvements are needed to increase the spillway capacity to safely pass the updated design flood without overtopping the existing embankment dam. This project is needed for dam safety. This project will construct a new concrete spillway with adequate flow capacity along the alignment of the existing auxiliary spillway and additional flood protection to the Moccasin project facilities. &KHUU\'DP6SLOOZD\6KRUW7HUP,PSURYHPHQWV
Cherry Dam Spillway is a 334 foot-wide ogee-type concrete weir that discharges into an unlined adjacent channel. The spillway capacity is designed for 52,000 cfs. A spill of 1,500 cfs in 2010 resulted in signi³cant erosion damage to the unlined spill channel, largescale erosion along the western segment of Cherry Dam, and flooding of Cherry Power Tunnel Adit and a campground downstream. Engineering studies showed that remedial measures and erosion protection for the spill channel are needed to ensure that spill flows from Cherry Valley Dam spillway can be contained without erosion damage to the existing embankment dam and downstream area. Studies also found that long-term improvement to the spillway is needed to increase the hydraulic capacity of the spillway to safely pass the design flood. This project is a short-term interim solution until the long-term spillway improvements are implemented. This project will re-establish containment for the breached spill channel section from the 2010 spill and will improve the flood $3
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Replace the existing deteriorated dam with a new concrete dam or diversion structure to provide deliveries from the Tuolumne River watershed, into Mountain Tunnel, for SFPUC customers during emergencies. 0RXQWDLQ7XQQHO
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Mountain Tunnel (MT) was constructed between 1917 and 1925 and is a critical, nonredundant link in the Regional Water System, conveying SFPUC Tuolumne River water supply from Kirkwood Powerhouse to Priest Reservoir. Due to the tunnel's 90 years of operation, deferred maintenance, and construction de³ciencies from the early 1900s, sections of the tunnel have deteriorated, some more extensively than others. The 2017 MT Inspection and Repairs Project provided an update to the Condition Assessment conducted in 2008. Short-term repairs were also made in 2017 and 2018 to reduce the risk of failures in the concrete lining prior to implementation of the long term project. The MT Improvements (Rehabilitation) Project was selected for design and construction of the preferred engineering alternative that will keep this vital component of the Regional Water System in reliable service for years to come. The budget and schedule are based on the MT Improvement Project construction phase, which is anticipated to take place between 2021 and 2027. For the Mountain Tunnel Improvements Project, the Water portion will rehabilitate the inside of the tunnel and extend the siphon at South Fork, along with related safety improvements to the roadways that access the Mountain Tunnel. The Joint portion of the Mountain Tunnel Improvements consists of work related to the construction of the Flow Control Facility and Priest Adit Tunnel.
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Design and install mitigation measures to prevent the building from collapsing and to prevent hazardous materials (such as lead-based paint and asbestos) from contaminating Moccasin Reservoir. 5RDGV %ULGJHV
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This project includes rehabilitation and/or replacement of O'Shaughnessy Adit Access Bridge and Lake Eleanor Dam Bridge.
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This project will replace the existing plant with a package two-train sequencing batch reactor (SBR) plant with grit removal and screening facilities, upgraded electrical and flow monitoring systems, flow equalization, SCADA instrumentation and automation features, and related site improvements. -RLQW,QIUDVWUXFWXUH3URMHFW'HYHORSPHQW
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Hetchy Capital Improvement Program $1,032,554,797.46 03-Oct-11 30-Jun-33 Hetch Hetchy Water Enterpise $1,032,554,797.46 03-Oct-11 30-Jun-33 Wa ter Infrastructure $149,423,107.00 26-Mar-12 30-Jun-33 Water Conveyance (Water) $140,661,975.00 01-Jul -19 13-Mar-28 6-3/9 DOYHDQG6DIH(QWU\,PSURYHPHQW $140,661,975.00 01-Jul -19 13-Mar-28 Water Infrastructure Proje ct Development $8,761,132.00 26-Mar-12 30-Jun-33 :$7(521/<352-'(9
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Power Infrastructure $191,653,862.00 29-May-12 30-Jun-33 Powerhouse $94,105,061.00 04-Jan-16 03-Dec-27
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0RFFDVLQ3+%\SDVV8SJUDGHV $27,391,426.00 18-Sep-20 01-Dec-27 Switchyard & Substations (Power) $43,987,428.00 01-Sep-15 30-Nov-28 :DUQHUYLOOH6XEVWDWLRQ5HKDELOLWDWLRQ
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Joint Infrastructure $691,477,828.45 03-Oct-11 30-Jun-33 Water Conveyance (Joint) $47,251,363.00 01-Feb-16 28-Feb-28 0RFFDVLQ3HQVWRFN
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Buildings (Join) $60,724,795.45 14-Dec-22 30-Jun-31
0RFFDVLQ(QJLQHHULQJDQG5HFRUGV%XLOGLQJ $60,724,795.45 14-Dec-22 30-Jun-31 Dams & Reservoirs (Joint) $234,755,539.99 01-Feb-18 30-Jun-31 &KHUU\6SLOOZD\
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0RFFDVLQ'DP/RQJ7HUP,PSURYHPHQWV $73,176,231.00 03-May-21 30-Jun-28 (DUO\,QWDNH'DP/RQJ7 HUP $88,742,000.00 30-Jun-23 30-Jun-31 Mountain Tunnel $238,218,951.00 03-Oct-11 03-Jun-27
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Powerhouse (Joint) $17,401,000.00 01-Jan-21 30-Jun-28
Road and Bridges (Joint) $29,370,881.00 27-Feb-20 30-Dec-27 %ULGJH5HSODFHPHQW $29,370,881.00 27-Feb-20 30-Dec-27
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