Progress Through: September 30, 2025
Quarterly Progress Report
San Mateo Clean
Water Program
for the
Wastewater
Treatment Plant
Projects
3rd Quarter Report July 1, 2025
to September 30, 2025
Submitted on: October 21, 2025
Active Wastewater Treatment Plant Projects
46T003 WWTP Nutrient Removal and Wet Weather Flow
Management Upgrade
Project Description:
The WWTP Upgrade and Expansion Project will replace aging infrastructure, provide capacity for wet weather flows, comply with regulatory requirements, enhance reliability, and produce a higher quality effluent that meets current and future permit requirements and Title 22 recycled water quality. Producing higher quality effluent will enable the City to develop a water reuse Program.
GMP3 – Contract
Contractor Sundt
Award Date 9/21/2020
Construction NTP 9/22/2020
Duration (calendar days) 1704
Contracted Completion Date 5/23/2025
Total Original Contract Amount $379,880,747.00
Revised Contract Amount $383,790,833.00
Original Contingency Amount $13,900,000.00
Revised Contingency Amount $59,260,612.00
Forecast Completion Date 5/22/2026
Current Contracted Amount $423,994,040.00
Actual Expended $409,404,747.00
Current Period Activities
Project/Construction Management
• Coordinating the Special Inspections Services
• Providing Construction Inspection Services
• Reviewing and recommending approval of change orders
• Administering the Consultant and Subconsultants contracts • Assisting with the Startup and Commissioning training of Plant Staff • Monthly WWTP update meeting with Foster City management team.
July through September 20 25 Page 11
SAN MATEO CLEAN WATER PROGRAM
QUARTERLY REPORT
Q3 2025
Project Inside
Project Manager Leswin DCunha
Project Type Wastewater System
Phase Construction
GMP1 – Contract
Contractor Sundt
Award Date 5/6/2019
Construction NTP 6/4/2019
Duration (calendar days) 1124
Contracted Completion Date 7/1/2022
Total Original Contract Amount $33,098,178.00
Contingency Amount $1,725,000.00
Acceptance Date 4/23/2025
Current Contracted Amount $34,783,550.00
Actual Expended $31,630,697.00
GMP2 – Contract
Contractor Sundt
Award Date 5/4/2020
Construction NTP 5/5/2020
Duration (calendar days) 619
Contracted Completion Date 01/14/2022
Total Original Contract Amount $17,716,049.00
Contingency Amount $1,645,000.00
Acceptance Date 3/6//2024
Current Contracted Amount $17,963,767.00
Actual Expended $17,206,534.00
Engineering Design/ Services During Construction
• ESDC: HDR continued review of submittals and RFIs on GMP 3; development of design change notices; onsite and remote support by Resident Engineer. HDR continuing the preparation of electronic Operations and Maintenance Manuals
Permitting:
Bay Area Air Quality Management District (BAAQMD)
A/C 30448 (Liquid Processes)
Because the A/C renewal request has been submitted, the City can continue construction/operation under the conditions of the existing permit until a new A/C permit is issued.
A/C 30449 (Generators)
Because construction is complete and source test data submitted, the City does not need to renew the A/C. The Source Test data was approved 10/26/23. The next step is to issue the Permit to Operate (P/O). In the interim, the City can operate the generators under the conditions of the A/C permit.
Public Outreach
• PM/CM and the CWP Public Outreach Lead coordinated on regular project updates to the website, newsletter, social media, etc.
Construction
GMP1
Project is closed out and accepted on. April 23, 2025.
GMP-2
Project is closed out and accepted in March 2024
GMP-3
The contracted completion date for GMP3 has been adjusted to May 22, 2025, to account for additional time to incorporate additional scope added for the back-up fuel system.
However, the City was informed by the contractor that the procurement of the electrical panels required for programming the SCADA have been impacted by the supply change issues because of the Covid pandemic, leak testing of the basins took longer than originally planned, the chemical piping system needs to be replaced to account for thermo- expansion and contraction, and the air aeration piping in the BNR area failed its initial pressure t est and required to be reworked. In addition, new processors and probus cards are required as well as an uninterrupted power supply for the VFDs. The changes have the project end date projected to be May 2026. The Contractor and the City are working together to minimize the potential delays and reduce this potential completion date extension. Commissioning meetings are being held to continue discussing start-up activities. Yard piping is complete except for final connection of the force mains to the Headworks schedule for November /December 2025.
Continued to perform Clean Water testing to check out all the processes equipment and programming prior to introducing sewage into the new process areas.
Perform electrical black out tests to determine the impacts of a power outage on the new equipment, backup generators and Uninterrupted Power Supply.
July through September 2025 Page 12
SAN MATEO CLEAN WATER PROGRAM
QUARTERLY REPORT
Q3 2025
Admin. Building is completed and has been granted temporary occupancy. Contractor needs to complete final punch list items.
The warehouse is completed and has been granted temporary occupancy Project/Construction Management
• HDR’s to continue to provide ESDC services including development of process O&M manuals, process training, expanded discipline-specific Resident Engineer services, and related known scope reflected in the contingency budget.
Engineering Design/Services During Construction
• ESDC: HDR continues to provide onsite resident engineering services.
Permitting
• Coordination with Building and Fire Departments for Final Occupancy for Admin Building. The anticipated final occupancy is mid -March 2026.
Public Outreach
• Provide project updates to the CWP Public Outreach Lead for monthly newsletter, website, and social media updates.
• Continue as-needed support in response to resident queries via the communication hotline.
Construction
GMP-1
• Completed
GMP-2
• Completed.
GMP-3
Continue coordination with Building and Fire Department for Final Occupancy for Admin. Building. Work on final punch list items.
Continue SCADA programing
Continue Clean Water Testing and Electrical Black Out testing Continue tie in of Force mains into the new headworks Seed the new plant
Continue landscaping and security improvements
Begin conversion of the Aeration basins to Flow Equalization Basins
July through September 2025 Page 13
SAN MATEO CLEAN WATER PROGRAM
QUARTERLY REPORT
Q3 2025
Risks and Opportunities
• Cal Water’s New Potable Water Main Extension: Completed • PG&E’s New Primary Service: Completed
• Relocation of PG&E’s Utilities from Detroit Drive: Completed
Financial Status
The current update shows an overrun ($64.77M) of the original budget.
Millions
Budget $532.71M
Actual Cost to date $558.24M
Estimate at Completion
$597.48M
Schedule Status
The current forecast shows project completion to be in May 2026
July through September 2025 Page 14
SAN MATEO CLEAN WATER PROGRAM
QUARTERLY REPORT
Q3 2025
46T009 IAP Package II
Project Description:
Replace and repair aging infrastructure at WWTP by adding screening, flexibility, and redundancy for WWTP solids processes. The project includes: (1) Mechanical bar screen and repair of concrete wall at the IJB; (2) Effluent PS #1 pumping and piping improvements; (3) replace two of the oldest pumps in PS #1; (4) Cake pumping system: add second cake pumping system; and (5) Second cake hopper system: add a second cake hopper, slide gate, access walkway, and platform.
Current Period Activities
Project/Construction Management
• Project close out
Engineering Design/ Services During Construction
(Various)
Aid in project Close out
Permitting
No activities during this period.
Public Outreach
No activities during this period.
Construction
Immediate Action Projects, Package II (IAP II)
Construction Substantially complete
Next Period Activities
Project/Construction Management
Project Close out
Engineering Design and Engineering Services During Construction Aid in project Close out
Permitting
No activities during this period.
Public Outreach
No activities during this period.
Construction
Immediate Action Projects, Package II (IAP II)
Project is Substantially Complete.
Finalize Settlement Agreement
July through September 2025 Page 17
SAN MATEO CLEAN WATER PROGRAM
QUARTERLY REPORT
Q3 2025
Project Inside
Project Manager Tyler Kirkendall
Project Type Wastewater System
Phase Construction
Design Firm Stantec, HDR
IAP II – Contract
Contractor Myers & Sons
Award Date 2/11/2019
Construction NTP 2/19/2019
Duration (calendar days) 848
Contracted Completion Date 6/14/2021
Contract Amount $6,340,000
Contingency Amount $1,144,000
Forecast Completion Date 10/16/2025
Current Contracted Amount $7,181,514
Actual Expended $7,181,514
Risks and Opportunities
Project is Substantially complete. Settlement agreement has been reached.
Financial Status
The current update shows an overrun ($1.8 M) of the original budget.
Million
s
Budget $13.0M
Actual Cost to date $13.8M
Estimate at
Completion
$14.8M
Schedule Status
Project substantially complete. A settlement agreement between the contractor and the City has been reached. Based on this agreement the Estimate at Completion reduced by $2.2 million .
July through September 2025 P A G E 18
SAN MATEO CLEAN WATER PROGRAM
QUARTERLY REPORT
Q3 2025
46T010 IAP Package III
Project Description:
Upgrade aging infrastructure and increase reliability for the effluent PS at the WWTP. Improvements include performing hydraulic analysis on the effluent PS and flow meters; add variable-frequency drives (VFDs) and check valves on stormwater pumps; replace check valves (3) for dry weather pumps; replace MCCs/VFDs (4) and control panels (4) for dry weather pumps; and replace doors (3) and windows (10), repair roof, and add HVAC for the PS.
IAP III –
Contract
Contractor Mountain
Cascade
Construction NTP 6/30/2019
Duration (calendar days) 680
Contracted Completion Date 5/14/2025
Contract Amount $11,344,696
Contingency Amount $2,270,000
Forecast Completion Date 3/30/2026
Current Contracted Amount $12,074,621
Actual Expended $7,811,445
Current Period Activities
Project/Construction Management (Jacobs -Riva Mitra/Tanner Pacific) Project Management by Jacobs with assistance from the City Construction Management by Tanner Pacific
Engineering Design/ Services During Construction (HDR)
Review of Submittals and RFI’s
Construction
Continued construction of Site Waste Pump Station and associated piping Continued construction of the Effluent Pump Station expansion Continue replacement of the roof on Effluent Pump Station Completed replacement of the HVAC units and continued construction of the piping in the Solids Handling Building
Completed replacement of Digester 1 piping.
Completed structural repairs of concrete and installation of new windows in the Effluent Pump Station Building. Completed Valve Replacement in the Effluent Pump Station Next Period Activities
Project/Construction Management (City/Tanner Pacific)
Construction Management by Tanner Pacific
Project Management by Jacobs.
July through September 2025 P A G E 19
SAN MATEO CLEAN WATER PROGRAM
QUARTERLY REPORT
Q3 2025
Project Inside
Project Manager TBD
Project Type Wastewater System
Phase Engineering
Engineering Design/ Services During Construction
HDR to continue EDSC.
Construction
Continuing the construction of Site Waste Pump Station and Improvements to the Effluent Pump Station and associated piping
Continuing the connection to the Effluent Pump Station discharge piping Continue replacement of the roof on the Effluent Pump Station.
Risks and Opportunities
Rescoping the project pushed out the completion date of the project.
Financial Status
The current update shows an overrun ($16.89 M) of the original budget. The original budget was an estimate to be used as a place holder that was set prior to having any knowledge of the project scope of work. The overall program carried a large contingency to compensate for this unknown and a portion of those contingencies are being used to offset this overrun. Th e estimate has increased to account for changes required to address unforeseen underground utilities and their impact on the new electrical duct banks.
Budget $2.47M
Actual Cost to
date
$13.79M
Estimate at
Completion
$19.36
million
Schedule Status
The current forecast shows final completion in March 2026.
July through September 2025 Page 20
SAN MATEO CLEAN WATER PROGRAM
QUARTERLY REPORT
Q3 2025
46T090 Annual Major Component WWTP
Project Description:
Maintain reliable plant operations to meet regulatory permit requirements and repair and replace critical WWTP
infrastructure. The operations and maintenance team maintain an active list of potential projects that are implemented as funds are available.
Current Period Activities
Project/Construction Management (Jacobs- Riva Mitra/ Tanner Pacific) Jacobs provides Project Management with assistance from the city staff. Tanner Pacific provides Construction Management
AMC project
Update WWTP Biosolids and Energy Management Plan – Brown and Caldwell are working on the study.
Phase 1 of the study investigated the condition of the interior of Digester 2. And discovered that the repairs required for the digester were more extensive than was originally envisioned. The remainder of the Study to be completed in March 2026.
Digester 1 Improvements - waiting for biosolids report to be completed. Centrifuge and Centrifuge Feed Pump Replacement – Carollo Engineering selected to prepare plans and specifications for the project. Design to be completed in Fall of 2026. Solids Handling Systems I&C Improvements – the scope of work has been significantly reduced as a large percentage of this work has been accomplished with other AMC or IAP projects. The remainder programming work will be done as a contract with a consultant programmer. Digester Transfer Pump Project –. VFD’s arrived in late March 2025. Project completion November 2025. 3 Water Pumping Improvements – Project advertised for Bid on Oct 2, 2025. Bids to open on October 30, 2025. Approximately one year to construct.
DAFT Corrosion Improvements – Study to evaluate alternatives to repairing DAFT was awarded to Carollo in November 2024. Study completed in August 2025.Study recommends replacing the DAFT with Rotary Drum Thickeners.
MCC Replacement- HDR is working on finalizing the design for advertisement in December 2025.
Permitting (Various)
None
Construction
Digester Transfer Pump Project was awarded in November 2023. The contractor has procured the equipment.
Minor electrical work has started. VFDs arrived in March 2025. Programming issues are being resolved.
Construction is estimated to be completed in November 2025. Digest 2 Mixer Repair/Replacement – SPX was awarded the repair of the mixer in September 2024. The mixer took approximately 6 months to repair. Repairs were completed in May 2025. An initial investigation after cleaning Digester 2 showed the interior and draft tube need to be coated, and the draft tube bracing be repaired, prior to coating the lower portion of the digester needs to have some additional welding done to repair some minor thinning in small areas of the digester. Repairs were completed in late September 2025. The Digester is available to be brought back online in October. However, the Digester will be brought back online when the new liquid process is online approximately November/December 2025.
July through September 2025 Page 23
SAN MATEO CLEAN WATER PROGRAM
QUARTERLY REPORT
Q3 2025
Project Inside
Project Manager Riva Mitra
Project Type Wastewater System
Phase Engineering
Next Period Activities
Project/Construction Management (City/ Tanner Pacific)
Continue CM on the Digester Transfer Pump Project
Engineering Design/ Services During Construction
• Design Consultants providing EDSC for the Digester Transfer Pump project. • Advertise and award the 3-Water/Ferric Project
• Advertise for Bid the MCC Replacement project
• Continue working on the Biosolids and Energy management plan • Award the design for the Replacement of the DAFT project • Continue the design for the Centrifuge project
• Select consultant for the Solids Handling Systems I&C project • Monthly WWTP update meeting with Foster City management team. for the AMC projects.
Permitting
None
Construction
Continue the Construction on the Digester Transfer Pump project with the installation of the VFDs. Advertise the MCC Replacement project
Begin Construction of the 3-water /Ferric Project
Risks and Opportunities
The condition of Digester 2 was significantly worse than what was expected. Since Digest er 1 is older than Digester 2 there is concern that Digester 1 may need major repairs. The extent of the repairs needed will be determined by the analysis performed as part of the Biosolids/Biogas Study.
Financial Status
Project shows EAC over budget.by $14.7 million The original budget was an estimate to be used as a place holder that was set prior to having any knowledge of the project scope of work. The overall program carried a large contingency to compensate for this unknown and a portion of those contingencies are being used to offset this overrun. The current estimate is based on defined scopes of work.
Budget $8.92M
Actual Cost to date $4.89M
Estimate at Completion $23.60M
July through September 2025 Page 24
SAN MATEO CLEAN WATER PROGRAM
QUARTERLY REPORT
Q3 2025
Schedule Status
AMC 6 +23 Natural Gas Line Replacement was completed in November 2022. AMC Digester 2 Mixer Repair/Replace, awarded to SPX in September 2024; Mixer has been repaired. Digester 2 ‘s interior is cleaned, repaired and recoated prior to the Mixer being installed. Construction was completed in September 2025.
AMC Digester Transfer Pump was awarded in November 2023. The contractor has completed minor electrical work. VFDs arrived in March 2025. Programming issues are being resolved. Scheduled to be completed in November 2025...
All other AMC projects are either advertised for bid or in the design or predesign phase.
July through September 2025 Page 25
SAN MATEO CLEAN WATER
QUARTERLY REPORT
Q3 2025
Completed Projects
Wastewater Treatment Plant Projects
Updated to latest values from EDEN (January 2020)
Name
Start Date
Finish
Date
Actual Cost
469948: SCADA Immediate Projects: Phase 2 (IAP) 1/2/2015 11/25/2015 $1,524,717 469962: Short-Term MCC Replacement Project (IAP) 1/2/2015 11/25/2015 $49,628 469973: Secondary System: Immediate Projects: SCs 1-4 and return- activated sludge Pump Values (IAP)
1/2/2015 11/25/2015 $426,918
469975: Solids: Immediate Projects: GT 1&2 (IAP) 1/2/2015 11/25/2015 $372,358 469976: Immediate Projects: Boiler Replacement 1/2/2015 4/29/2016 $475,296 469978: Solids Building: Immediate. Projects: Centrifuge Hoist Project (IAP) 1/2/2015 11/25/2015 $2,410 46T002 IAP Package I 8/1/2018 8/28/19 $18,621,868
TOTAL $21,472,951
July through September 2025 Page 26
SAN MATEO CLEAN WATER PROGRAM
QUARTERLY REPORT
Q3 2025