DEPARTMENT
Infrastructure
AGENDA NO. 6b
MEETING DATE
November 28, 2023
AGENDA ITEM
Public Utilities Commission
City and County of San Francisco
Calendar: Consent Calendar
Contract/Project Manager: Tim Parkan, Project Manager
Accept Closeout and Authorize Final Payment for Contract No. HH-1003R, Moccasin Powerhouse Generator Step-up Transformer Installation
Summary of
Proposed
Commission Action:
Accept work performed by Big Valley Electric , under Contract No. HH- 1003R, Moccasin Powerhouse Generator Step-up Transformer Installation, for a total C ontract amount of $3,730,101 and a total Contract duration of 750 consecutive calendar days (approximately two years); and authorize final payment to the contractor.
Background: The City completed construction of Moccasin Powerhouse and placed it into operation January 27, 1969. The facility's rated capacity is 100,000 kilovolt- amperes (kVA). The powerhouse utilizes two 13.8-230Y/132.9-115Y/66.5 kV, three phase 57.5 megavolt-amperes (MVA) transformers with a third as a spare. Delivery of Hetch Hetchy water is dependent on the operation of both generators which need reliable transformers. All three transformers had exceeded their service life, two original Toshiba transformers and a third General Electric/Prolec.
On April 27, 2021, by Resolution No. 21- 0062, this Commission awarded Contract No. HH-1003R, Moccasin Powerhouse Generator Step- up Transformer Installation , to Big Valley Electric. The original C ontract amount was $3,321,432, and the original C ontract duration was 716 consecutive calendar days.
On September 27, 2022, by Resolution 22-0167, this Commission approved an increase of $600,000 to the Contract cost contingency for a total Contract cost contingency of $932,143 and a total C ontract amount of up to $4,253,575, with no change to the Contract duration contingency
Construction of the new Moccasin Powerhouse generator step- up transformers commenced on June 7, 2021. The contractor achieved Substantial Completion on April 6, 2023. SFPUC issued Final Completion on June 26, 2023.
Agenda Title: HH-1003R, Moccasin Powerhouse Generator Step-up Transformer Installation Commission Meeting Date: November 28, 2023
Scope of Contract: The work under Contract No. HH -1003R was the first of three subprojects for improvements to the Moccasin Powerhouse Generator and Step -Up Transformer Rehabilitation. Work was located at Moccasin in Tuolumne County.
The contract work consisted of:
• Installing two City furnished step-up transformers.
• Replacing two transformer foundations including oil containment. • Making improvements to the grounding system.
• Performing protection studies and determine relay settings. • Commissioning new protection relays.
• Terminating all connections to the transformers.
• Terminating and testing all monitoring and protective wiring. • Installing the transfo rmers in consecutive years, Winter 2021/2022 and Winter 2022/2023.
• Testing the three old transformers for the City to determine which transformer is best suited as a spare. The other two transformers became property of the contractor and contractor removed them.
Modifications to the
Contract:
Modifications Nos. 1-4: The SFPUC modified the Contract to decrease the Contract amount by $3,486, with no change to the C ontract duration, to modify the foundation and oil sump pump, provide additional budget for Bid item 13, adjust the contingency allowance for hazardous material, include changes to the wiring and electrical drawings, provide credit for not applying fire protection intumescent coatin g, and receive a credit for contractor not providing a construction trailer , for a total C ontract amount of $3,317,946.
Modifications Nos. 6- 9(Final): The SFPUC modified the C ontract increasing the Contract amount by $412,155 (within the approved increased contingency), and increasing the Contract duration by 34 consecutive calendar days (within the original contingency) for modifications to the work area, oil & l ead removal, additional grounding study, Unit 2 s ump pump, wiring and drawing verification, and single day powerhouse outages, for a total C ontract amount of $3,730,101 and a total C ontract duration of 750 consecutive calendar days.
Funding and Costs: Funding Source:
Hetch Hetchy 10-Year Capital Improvement Program
Project No. 10014086, Moccasin Powerhouse Generator and Step -Up Transformer Rehabilitation
Original Contract Amount: $3,321,432
Modifications Nos. 1–4 Amount: ($3,486)
Modifications Nos. 6-9(Final) Amount: $412,155
Total Final Contract Amount: $3,730,101
Schedule: Notice-to-Proceed Date: June 7, 2023
Agenda Title: HH-1003R, Moccasin Powerhouse Generator Step-up Transformer Installation Commission Meeting Date: November 28, 2023
Original Contract Duration: 716 consecutive calendar days Modifications Nos. 1-4 Duration: zero calendar days
Modifications Nos. 6-9(Final) Duration: 34 consecutive calendar days Total Final Contract Duration: 750 consecutive calendar days
Local Business
Enterprise
Participation and
Non-Discrimination
In Contracting:
The Contract Monitoring Division (CMD) established a 3% Local Business Enterprise (LBE) subcontracting requirement for this Contract. The contractor committed to 18.93% LBE participation with its bid submittal.
CMD has determined the contractor complied with the LBE subcontracting requirements by achieving a final LBE subcontracting participation of
22.43%.
Attachment: 1. Contract Monitoring Division Memorandum
Agenda Title: HH-1003R, Moccasin Powerhouse Generator Step-up Transformer Installation Commission Meeting Date: November 28, 2023
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PUBLIC UTILITIES COMMISSION
City and County of San Francisco
RESOLUTION NO.
WHEREAS, On April 27, 2021, by Resolution No. 21- 0062, this Commission awarded Contract No. HH- 1003R, Moccasin Powerhouse Generator Step- up Transformer Installation to Big Valley Electric to replace two generator step-up transformers including foundations and oil containment basins: and
WHEREAS, On June 7, 2021, the San Francisco Public Utilities Commission issued the construction Contract notice-to-proceed; and
WHEREAS, The original Contract amount was for $3,321,432 and the original C ontract duration was 716 consecutive calendar days; and
WHERAS, Modifications Nos 1-4 decreased the Contract amount $3,486 with no change in Contract duration for modifications to the foundation and an oil sump pump, additional budget for Bid item 13, contingency allowance for hazardous material, changes to the wiring and electrical drawings, credit for not applying fire protection intumescent coating, and credit for not providing a construction trailer for a total C ontract amount of $3,317,946 and a total C ontract duration of 716 consecutive calendar days; and
WHEREAS, On September 27, 2022, by Resolution 22- 0167, this Commission approved an increase of $600,000 to the Contract cost contingency for a total Contract cost contingency of $932,143 and a total Contract amount of up to $4,253,575, with no change to the contract duration contingency; and
WHERAS, Modifications Nos 6-9 (Final) increased the Contract amount by $412,155 and increased the Contract duration by 34 consecutive calendar days (within the original contingency) for modifications to the work area, oil & lead removal, additional grounding study, Unit 2 sump pump, wiring and drawing verification, and single day powerhouse outages , for a total final Contract amount of $3,730,101 and a total final Contract duration of 750 consecutive calendar days; and
WHEREAS, Contractor, Big Valley Electric, has completed its work under Contract No.
HH-1003R, Moccasin Powerhouse Generator Step-up Transformer Installation; and WHEREAS, Contract Monitoring Division established a Local Business Enterprise (LBE) subcontracting participation of 3% for this Contract, and the contractor committed to 18.93% LBE participation with its bid submittal and achieved a final LBE participation of 22.43%; and WHEREAS, Funds are available from Project No. 10014086, Moccasin Powerhouse Generator and Step-Up Transformer Rehabilitation; now, therefore, be it
RESOLVED, That this Commission hereby accepts work performed by B ig Valley Electric, under C ontract No. HH-1003R, Moccasin Powerhouse Generator Step-up Transformer Installation, for a total C ontract amount of $3,730,101 and a total Contract duration of 750 consecutive calendar days; and authorizes final payment to the contractor.
I hereby certify that the foregoing resolution was adopted by the Public Utilities Commission at its meeting of November 28, 2023.
Secretary, Public Utilities Commission