AGENDA ITEM
Public Utilities Commission
City and County of San Francisco
DEPARTMENT: Infrastructure Division
AGENDA NUMBER: 9k
MEETING DATE: October 13, 2026
Calendar: Consent Calendar
Contract/Project Manager: Maria Garcia Baeza
Approve Increase s to the Cost and Duration Contingencies , Contract No. HH -1010, Moccasin Wastewater Treatment Plant Replacement
Summary of Proposed
Commission Action:
Approve an increase of $300,000 to the existing cost contingency and an increase of 299 calendar days to the existing duration contingency for Contract No. HH -1010, Moccasin Wastewater Treatment Plant Replacement, with Sierra Mountain Construction, Inc., for a revised cost limit of $8,558,404 and a revised duration limit of 1,333 calendar days (approximately four years), due to differing site conditions, longer-than-anticipated lead time for major equipment, and enhanced quality control needs.
Background: The San Francisco Public Utilities Commission (SFPUC) owns and operates Moccasin Wastewater Treatment Plant which serves the community of Moccasin in Tuolumne County. The existing
packaged extended aeration system was installed around 1977.
The treatment p lant is outdated and is becoming increasingly maintenance-intensive and challenging to operate and control.
SFPUC is replacing the existing system with an updated and more efficient system, which will resolve the current challenges and improve the reliability and operability of the facility.
On February 27, 2024, by Resolution No. 24-0035, this Commission awarded Contract No. HH-1010, Moccasin Wastewater Treatment Plant Replacement, to Sierra Mountain Construction, Inc., in an amount of $7,507,640 and with a duration of 940 consecutive calendar days.
Scope of Contract: The contract work location is in Moccasin, Tuolumne County, California.
The contract work consists of:
• Building a new wastewater treatment plant including an influent lift station, equalization basin, preliminary treatment equipment, a sequencing batch reactor system, a chlorine contact tank, and ancillary equipment; and
• Installing a new medium voltage pad -mounted transformer and replacing an existing medium voltage power distribution pole; and
Agenda Title: Contract No. HH-1010, Moccasin Wastewater Treatment Plant Replacement Commission Meeting Date: October 13, 2026
• Demolition of the existing wastewater treatment plant after the new plant is commissioned.
Modifications to the
Contract:
Modification Nos. 1 –11: Staff issued Modification Nos. 1 -11, increasing the contract amount by $450,593, within the original cost contingency, due to necessary equipment procurement, differing site conditions , design revisions, installation of an additional waterline, modifications to the Influent Pump Station, and other site work to accommodate existing field conditions . Modification No. 7 added eight days to the contract duration , within the original duration contingency, to accommodate the contractor’s supply and installation of 277 linear feet of polyethylene pipe waterline.
[Proposed] Increase to Cost and Durations Contingencies:
Staff recommends the Commission approve an increase of
$300,000 to the existing cost contingency and an increase of 299 calendar days to the existing duration contingency, due to differing site conditions, longer -than-anticipated lead time for major equipment, and increased quality control needs , for a revised contract cost limit of $8,558,404 and a revised duration limit of 1,333 calendar days.
Funding and Costs: Funding Source: Hetch Hetchy Capital Improvement Program Project No.10014110,Moccasin Wastewater Treatment Plant Replacement
Contract Amount: $7,507,640
Original 10% Cost Contingency: $750,764
Approved Increase in Cost Contingency: $0
Modified Increases to Contract Amount: $450,593
Total Current Contract Amount: $7,958,233
Current Cost Contingency: $300,171
[Proposed] Additional Cost Contingency: $300,000
Total [Proposed] Cost Limit: $8,558,404
Schedule: Notice-to-Proceed Date: June 3, 2024
Original Contract Duration: 940 consecutive calendar days Original 10% Duration Contingency: 94 calendar days
Approved Increase to Duration Contingency: 0 calendar days Modified Increase to Duration: 8 calendar days
Total Current Contract Duration: 948 consecutive calendar days Current Duration Contingency: 86 calendar days
[Proposed] Additional Duration Contingency: 299 Calendar Days
Total [Proposed] Duration Limit: 1,333 consecutive calendar days
Agenda Title: Contract No. HH-1010, Moccasin Wastewater Treatment Plant Replacement Commission Meeting Date: October 13, 2026
Environmental
Review:
On February 22, 2023, the Planning Department determined the Project to be categorically exempt from environmental review under the California Environmental Quality Act Guidelines Section 15302, Class 2 (Replacement or Reconstruction) (Case No. 2022 - 006804ENV).
The proposed modifications are within the scope of the Project evaluated in the exemption. View the exemption.
Local Business
Enterprise Utilization
and Non-
Discrimination in
Contracting:
The Contract Monitoring Division established a 7% Local Business Enterprise (LBE) subcontracting requirement for this contract. The contractor committed to 7.22% LBE subcontractor participation with its bid submittal, and this amount remains unchanged.
Agenda Title: Contract No. HH-1010, Moccasin Wastewater Treatment Plant Replacement Commission Meeting Date: October 13, 2026
Figure 1: HH-1010 Project Location, circled in red, in Moccasin, Tuolumne County, California
PUBLIC UTILITIES COMMISSION
City and County of San Francisco
RESOLUTION NO. __________________
WHEREAS, The San Francisco Public Utilities Commission (SFPUC) owns and operates the Moccasin Wastewater Treatment Plant which serves the community of Moccasin in Tuolumne County, CA. The existing packaged extended aeration system was installed around 1977. The existing treatment plant is outdated and becoming increasingly maintenance-intensive and challenging to operate and control. SFPUC is replacing the existing system with a more recent and efficient system, which will resolve the current challenges and improve the reliability and operability of the facility; and
WHEREAS, On February 27, 2024, by Resolution No. 24-0035, this Commission awarded Contract No. HH-1010, Moccasin Wastewater Treatment Plant Replacement to Sierra Mountain Construction, Inc.; and
WHEREAS, The original contract amount was $7,507,640 and the original contract duration was 940 consecutive calendar days; and
WHEREAS, The Contract Monitoring Division established a 7.0% Local Business Enterprise (LBE) subcontracting participation requirement for this Contract, Sierra Mountain Construction, Inc., committed to 7.22% LBE subcontracting participation in its bid submittal, and this amount remains unchanged; and
WHEREAS, The contract Notice-to-Proceed date was June 3, 2024; and
WHEREAS, To date, Staff has issued Modification Nos. 1 – 11, within the original contingencies, increasing the contract amount by $450,593 and increasing the contract duration by eight calendar days for a current contract amount of $7,958,233 and contract duration of 948 consecutive calendar days; and
WHEREAS, Staff recommends this Commission approve an increase of $300,000 to the existing cost contingency, and an increase of 299 calendar days to the existing duration contingency, for a revised cost limit of $8,558,404 and a revised duration limit of 1,333 consecutive calendar days , to address cost increases and schedule extension associated with differing site conditions, longer -than-anticipated lead time for major equipment, and enhanced quality control needs; and
WHEREAS, On February 22, 2023, the Planning Department determined the Project to be categorically exempt from environmental review under the California Environmental Quality Act Guidelines Section 15302, Class 2 (Replacement or Reconstruction) (Case No. 2022-006804ENV); and
WHEREAS, The proposed modifications are within the scope of the Project evaluated in the exemption; and
WHEREAS, Funds are available from Project No. 100 14110, Moccasin Wastewater Treatment Plant Replacement; now, therefore, be it,
RESOLVED, That this Commission hereby approves an increase of $300,000 to the existing cost contingency and increase of 299 calendar days to the existing duration contingency, for Contract No. HH -1010, Moccasin Wastewater Treatment Plant Replacement, with Sierra Mountain Construction Inc., for a total cost contingency of $1,050,764 and a total duration contingency of 393 calendar days; and, be it,
FURTHER RESOLVED, That this Commission hereby authorizes the General Manager or the General Manager’s designee to consider and, if appropriate, approve any future modifications to the contract for a total cost limit of $8,558,404 and total duration limit of 1,333 consecutive calendar days.
I hereby certify that the foregoing resolution was adopted by the San Francisco Public Utilities Commission at its meeting of October 13, 2026.
__________________________________
Director of Commission Affairs
San Francisco Public Utilities Commission