DEPARTMENT Infrastructure AGENDA NO. 10b
MEETING DATE March 22, 2022
APPROVAL:
COMMISSION
SECRETARY Donna Hood
AGENDA ITEM
Public Utilities Commission
City and County of San Francisco
Construction Modification: Consent Calendar
Project Manager: Carman Luk
Approve Increase to Construction Duration Contingency for Contract No. WW-667, Mariposa Dry Weather Pump Station Improvements
Summary of Proposed
Commission Action:
Approve an increase of 210 calendar days to the construction duration contingency for Contract No. WW-667, Mariposa Dry Weather Pump Station Improvements with Western Water
Constructors, Inc.; and authorize the General Manager to approve future modifications to the contract for a total contract duration of up to 1,350 consecutive calendar days (approxi mately three years and nine months), with no change to contract amount.
Background: In 1954, the City and County of San Francisco (City) designed and built the Mariposa Pump Station (Pump Station) on Port property near the foot of Mariposa Street at 855 Terry Francois Boulevard to convey combined wastewater flows from approximately 240 acres of the City to the Southeast Water Pollution Control Plant (SEP). Since that time, the City installed a transport/storage box with wet -weather pumps and a wet-weather force main (Force Main) adjacent to the original pump station. After the City installed the wet -
weather system, the Pump
Station and associated Force Main conveyed both dry and wet weather wastewater flows to SEP.
Due to recent high-density real estate developments in the City, the dry- weather wastewater flows to the Pump Station have increased. The San Francisco Public Utilities Commission (SFPUC) evaluated the anticipated increase in wastewater flows and developed the Pump Station and Force Main improvements (the Project) to convey the increased combined dry-weather sewage to SEP and meet its regulatory requirements.
The Force Main portion of the Project is being performed under Contract No. DB-128R2, the Bay Corridor Transmission Distribution Project – Phase 1, which this Commission awarded on April 25, 2017, by Resolution No. 17-0092.
Contract: Contract No. WW-667, Mariposa Dry Weather Pump Station Improvements Commission Meeting Date: March 22, 2022
The remaining pump station portion of the Project is being performed under Contract No. WW -667, Mariposa Dry Weather Pump Station Improvements.
On September 11, 2018, by Resolution No. 18-0150, this Commission awarded Sewer System Improvement Program (SSIP) funded Contract No. WW -667, Mariposa Dry Weather Pump Station Improvements.
The original contract amount was $17,031,000, and the original contract duration was 780 consecutive calendar days.
Description of Scope of
Work:
The contract work location is at 855 Terry A. Francois Boulevard in San Francisco. The contract work consists of:
• Demolishing the existing pump station and wet-well;
• Constructing a new wet-well and pump station building; • Furnishing and installing new dry- weather pumps, manifold, piping and associated valves, pipe supports, flow meters , and other associated parts;
• Installing new crane systems inside the pump station; • Installing new heating, ventilation, and air conditioning (HVAC) systems;
• Installing new electrical, instrumentation & controls systems; and
• Testing and commissioning of all major mechanical, electrical, instrumentation and automation systems before turning over the station back to SFPUC for operation.
Changes and Modifications to the Contract:
Section 6.22(h) of the Administrative Code requires that any cumulative increase of the contract amount or duration in excess of 10% of the original contract amount or duration be approved by this Commission.
On May 12, 2020, by Resolution No. 20- 0084, this Commission approved an increase of 282 calendar days to the contract duration contingency for a total contract duration of up to 1,140 consecutive calendar days, with no change in the contract amount.
Modification Nos. 1 to 4 were issued increasing the contract amount by $406,755 (within the original 10% amount contingency) to upgrade the security system to the latest SFPUC standards and provide temporary generators, for a total contract amount of $17,437,755, with no change to the contract duration.
Modification Nos . 6 to 10, 12 to 15, and 17 to 19 were issued increasing the contract amount by $530,863 to resolve unforeseen site conditions and implement various design changes including fencing and fence foundation, furnishing spare pumps, light control panels, Contract: Contract No. WW-667, Mariposa Dry Weather Pump Station Improvements Commission Meeting Date: March 22, 2022
additional programming for the monorail, providing explosion proof enclosures, and conduits rerouting within the site , for a total contract amount of $17,968,617, with no change to the contract duration.
Modification Nos. 5, 11, and 16 were issued increasing the contract duration by 279 consecutive calendar days to overcome delays from PG&E in providing temporary electrical power to the pump station, COVID-related work inefficiencies , and unforeseen site conditions related to excavation work, for a total cont ract duration of 1,059 consecutive calendar days (approximately 2 years and 11 months), with no change to the contract amount.
Requested Increase to Contract Duration Contingency
An increase of 210 calendar days to the existing contract duration contingency is being requested to overcome additional COVID-related work inefficiencies, additional weather impacts , and proposed power outages which could delay continuous station performance testing and commissioning, for a total contract duration of up to 1,350 consecutive calendar days, with no change to the contract amount.
Result of Inaction: A delay or denial approving this modification will hinder completion of the project.
Funding, Budget and
Costs:
Funding: Project No. CWWSIPCSPS03, Mariposa Dry-Weather Pump Station
Original Contract Amount: $17,031,000
Original 10% Cost Contingency: $1,703,100
Total Contract Cost Limit: $18,734,100
Schedule: Notice-to-Proceed Date: January 28, 2019
Original Contract Duration: 780 consecutive calendar days Original 10% Duration Contingency: 78 calendar days
Approved Increase to Duration Contingency: 282 calendar days Requested Additional Duration Contingency: 210 calendar days Total Revised Contract Duration Limit: 1,350 consecutive calendar days
Compliance with
Chapter 14B: Local
Business Enterprise
Utilization and Non-
Discrimination In
Contracting Ordinance:
The Contract Monitoring Division established a Local Business Enterprise (LBE) subcontracting requirement of 13% for this contract.
The contractor committed to a LBE subcontractor participation of
23.98% with its bid submittal.
Recommendation: SFPUC staff recommends that the Commission adopt the attached resolution.
Contract: Contract No. WW-667, Mariposa Dry Weather Pump Station Improvements Commission Meeting Date: March 22, 2022
PUBLIC UTILITIES COMMISSION
City and County of San Francisco
RESOLUTION NO.
WHEREAS, On September 11, 2018, by Resolution No. 18- 0150, this Commission approved the award of Contract No. Contract No. WW-667, Mariposa Dry Weather Pump Station Improvements to Western Water Constructors, Inc., to accommodate the increased combined dry- weather sewage to the Southeast Water Pollution Control Plant and meet its regulatory requirements; and
WHEREAS, On January 28, 2019, San Francisco Public Utilities Commission (SFPUC) staff issued the construction notice-to-proceed for this project; and WHEREAS, The original contract amount was for $17,031,000 and the original contract duration was 780 consecutive calendar days; and
WHEREAS, On May 12, 2020, by Resolution No. 20-0084, this Commission approved an increase of 282 calendar days to the contract duration contingency for a total contract duration limit of up to 1140 consecutive calendar days, with no change in contract amount; and WHEREAS, An increase of 210 calendar days to the contract duration contingency is being requested to overcome delays due to additional COVID-related work inefficiencies, additional weather impacts, and unforeseen power outages; and
WHEREAS, Section 6.22(h) of the San Francisco Administrative Code requires Commission approval for any cumulative increase in contract amount or duration in excess of 10% of the original contract amount or duration; now, therefore be it RESOLVED, That this Commission hereby approves an increase of 210 calendar days to the existing contract duration contingency for Contract No. WW -667, Mariposa Dry Weather Pump Station Improvements, for a total contract duration contingency of up to 570 calendar days; and be it
FURTHER RESOLVED, That this Commission hereby authorizes the General Manager, or his or her designee, to consider, and, if appropriate, to approve any future modifications to the contract duration for a total contract duration of up to 1,350 consecutive calendar days, with no change to the contract amount.
I hereby certify that the foregoing resolution was adopted by the Public Utilities Commission at its meeting of March 22, 2022.
Secretary, Public Utilities Commission