DEPARTMENT
Infrastructure Division
AGENDA NO.
5b
MEETING DATE
March 14, 2023
APPROVAL:
COMMISSION
SECRETARY
Donna Hood
AGENDA ITEM
Public Utilities Commission
City and County of San Francisco
Construction Modification: Consent Calendar
Contract Manager: Alisha Reinhardt
Approve Increase to Construction Cost and Duration Contingencies for Contract No.
WD-2871, Sunol Valley Water Treatment Plant and Chlorination Facility Aqua Ammonia Structural Repairs and Tank Replacement to Cal State Constructors
Summary of Proposed
Commission Action:
Approve a $250,000 increase to the contract cost contingency and a 120 calendar day increase to the contract duration contingency for Contract No. WD -2871, Sunol Valley Water Treatment Plant and Chloramination Facility Aqua Ammonia Structural Repairs and Tank Replacement, with Cal State Constructors, for safe and proper cleaning and disposal of existing aqua ammonia tanks and for delays associated with the fabrication of new stainless steel tanks ; and authorize the General Manager to approve future modifications to the contract for a total contract amount of up to $2,279,883 and a total contract duration of up to 721 consecutive calendar days (approximately two years).
Background: In 2018, the San Francisco Public Utilities Commission (SFPUC) performed a s eismic assessment of its Sunol Valley Water Treatment Plant and Chlorination Facility that supports its water distribution and delivery system in the East Bay. As a result of the assessment, SFPUC determined that the aqua ammonia tank supports and a ppurtenant structural e lements at the S unol Valley Water Treatment Plant and Sunol Valley Chlorination Facility required repairs and replacement to ensure structural reliability and adherence to
Level of Service goals
associated with seismic reliability and as required by Alameda County.
The SFPUC also determined that re placement of the existing aqua ammonia tanks was necessary to ensure that the SFUPC meets its water quality Level of Service goal.
To accomplish needed repairs and tank replacement, SFPUC required the services of a hazardous waste contractor to prepare a safety plan and coordinate vapor -free cleaning and disposal of the existing a qua ammonia tanks. Additional davit arms and platform ladders are required to access and safely lift the manhole covers due to the weight of the stainless steel on the new aqua ammonia tanks. On November 9, Contract: Contract No. WD-2871, Sunol Valley Water Treatment Plant and Chlorination Facility Aqua Ammonia Structural Repairs and Tank Replacement to Cal State Constructors
Commission Meeting Date: March 14, 2023
2021, by Resolution No. 21-0167, the Commission awarded Contract No. WD-2871, Sunol Valley Water Treatment Plant and Chlorination Facility Aqua Ammonia Structural Repairs and Tank Replacement to Cal State Constructors. The original contract amount was $1,769,014, and the original contract duration was 547 consecutive calendar days.
Description of Scope of
Work:
The contract work location is in Sunol, California at the Sunol Valley Water Treatment Plant and Chloramination Facility. The contract work consists of furnishing and installing:
• Aqua ammonia chemical storage tanks
• Ultrasonic level sensors
• Vacuum breaker valve assemblies
• Electrically-actuated ball valves
• Ammonia gas detection and alarm system
• City-furnished tuning fork density meter
• Modifications to Alameda Siphon No. 1 aqua ammonia
injection vault
• Overhead canopy structure upgrades
Changes and
Modifications to the
Contract:
Modification No. 1 increased the contract amount by $100,869 (within the original cost contingency) to provide roving security throughout the Sunol Valley Water Treatment Plant due to security issues , for a total contract amount of $1,869,883, with no change to the contract duration.
Recommended Increase to Contract Cost and Duration
Contingencies
Staff recommends a $250,000 increase to the existing cost contingency and a 120 calendar day increase to the existing duration contingency for a hazardous waste contractor to properly clean and dispose of aqua ammonia tanks and install additional davit arms and platform ladders for safe access and also for delays associated with fabrication of the new stainless steel tanks , for a revised cost contingency of $426,901 and a revised duration contingency of 174 calendar days, and for a total contract amount of up to $2,195,915 and a total contract duration of up to 721 consecutive calendar days.
Budget & Costs: Funding: Project No. 10036522, East Bay Field R&R / 10015061, SVWTP & East Bay Fields / 10032938, Sunol PAC Units / 10036524, SVWTP R&R / 10029996, Water Treatment
Original Contract Amount: $1,769,014
Original 10% Cost Contingency: $176,901
Requested Additional Cost Contingency: $250,000
Total Revised Contract Cost Limit: $2,195,915
Schedule: Notice-to-Proceed Date: March 7, 2022
Original Contract Duration: 547 consecutive calendar days Original 10% Duration Contingency: 54 calendar days
Contract: Contract No. WD-2871, Sunol Valley Water Treatment Plant and Chlorination Facility Aqua Ammonia Structural Repairs and Tank Replacement to Cal State Constructors
Commission Meeting Date: March 14, 2023
Recommended Additional Duration Contingency: 120 calendar days Total Revised Contract Duration Limit : 721 consecutive calendar days
Compliance with
Chapter 14B: Local
Business Enterprise
Utilization and Non-
Discrimination In
Contracting Ordinance:
The Contract Monitoring Division established a 9% Local Business Enterprise ( LBE) subcontracting requirement for this contract. The contractor committed to a 19.01% LBE participation in its bid submittal.
Recommendation: San Francisco Public Utilities Commission staff recommends that the Commission adopt the attached resolution.
Contract: Contract No. WD-2871, Sunol Valley Water Treatment Plant and Chlorination Facility Aqua Ammonia Structural Repairs and Tank Replacement to Cal State Constructors
Commission Meeting Date: March 14, 2023
PUBLIC UTILITIES COMMISSION
City and County of San Francisco
RESOLUTION NO.
WHEREAS, The San Francisco Public Utilities Commission (SFPUC), following a seismic assessment, determined that repairs and replacement of its Sunol Valley Water Treatment Plant and Chlorination Facility were necessary to support its water delivery system and water quality Level of Service goals associated with seismic reliability and as required by Alameda County; and WHEREAS, On November 9, 2021, by Resolution No. 21-0167, the San Francisco Public Utilities Commission (SFPUC) awarded Contract No. Contract No. WD -2871, Sunol Valley Water Treatment Plant and Chlorination Facility Aqua Ammonia Structural Repairs and Tank Replacement to Cal State Constructors to Cal State Constructors; and WHEREAS, The original contract amount was for $1,769,014 and the original contract duration was 547 consecutive calendar days; and
WHEREAS, March 7, 2022 was the construction contract Notice-to-Proceed date; and WHEREAS, Modification No. 1 increas ed the contract amount by $100,869, within the original cost contingency, to provide roving security throughout the Sunol Valley Water Treatment Plant due to recent security issues, for a total contract amount of $1,869,883, with no change to the contract duration; and
WHEREAS, Staff recommends a $250,00 increase to the existing contract cost contingency and a 120 calendar day increase to the existing contract duration contingency for a hazardous waste contractor to clean and dispose of the existing aqua ammonia tanks and to install additional davit arms and platform ladders for safe access as well as for delays associated with fabrication of new stainless steel aqua ammonia tanks; and WHEREAS, Contract Monitoring Division established a 9% Local Business Enterprise (LBE) subcontracting participation for this contract, and the contractor committed to a 19.01% LBE subcontractor participation in its bid submittal; and WHEREAS, Funds are available from Project No. 10036522, East Bay Field R&R / 10015061, SVWTP & East Bay Fields / 10032938, Sunol PAC Units / 10036524, SVWTP R&R / 10029996, Water Treatment; now, therefore, be it
RESOLVED, That this Commission hereby approves a $250,000 increase to the existing contract cost contingency and an 120 calendar day increase to the existing contract duration contingency for Water Enterprise funded Contract No. Contract No. WD -2871, Sunol Valley Water Treatment Plant and Chlorination Facility Aqua Ammonia Structural Repairs and Tank Replacement to Cal State Constructors, with Cal State Constructors for a total cost contingency of $426,901 and a total duration contingency of 174 calendar days; and be it
FURTHER RESOLVED, That this Commission hereby authorize s the General Manager, or the General Manager’s designee to consider and, if appropriate, to approve any future modifications to the contract for a total contract amount of up to $2,195,915, and a total contract duration of up to 721 consecutive calendar days.
I hereby certify that the foregoing resolution was adopted by the Public Utilities Commission at its meeting of March 14, 2023.
Secretary, Public Utilities Commission