Update to
San Mateo City Council
By Public Works
February 18, 2025
1 Clean Water Program and Wastewater
Treatment Plant Upgrade & Expansion
• Clean Water Program Overview and Update
• Wastewater Treatment Plant Upgrade & Expansion Update 2 Agenda
Clean Water Program - Driver & Goals
Replace aging
infrastructure and
facilities
Build wet weather
sewer system capacity
assurance to prevent
overflows
Meet current and
future regulatory
requirements
Align with the City of
San Mateo and Foster
City’s sustainability goals
Driver: Regional Water Quality Control Board issued 2009 Cease & Desist Order to the City of San Mateo, Town of Hillsborough, and the Crystal Springs County Sanitation District requiring the elimination of sanitary sewer overflows (SSOs) Post
CWP
Clean Water Program Schedule Highlights
4 Recurring WWTP and Collection System Rehabilitations and Repairs WWTP & Collection System Capacity Improvements
Start WWTP
Upgrade & Expansion
Construction
2019
WWTP Upgrade & Expansion
Project Closeout
2026
Start UFES
Construction
2020
UFES Project
Closeout
2025
Program
Closeout
2026
2019 2020 2021 2022 2023 2024 2025 2026 2027
WWTP Upgrade & Expansion
New Facilities in Service
2025
Clean Water
Program
Initiated
2015
Budget
Baselined
2017
Clean Water
Program
5 • ~$1 billion, 10-year effort
• Wet Weather Management
• Collection System
Rehabilitation and Capacity
Improvements
• WWTP Upgrades
• Nutrient Removal
Note: Image shown displays the estimated
scope during April 2018.
Status of CWP
Capacity
Improvements
COLOR LEGEND
Projects Completed
Projects in Construction
Projects in Design
Notes:
Some project segments were eliminated
due to design optimizations.
Status of projects shown as of February
2025.
Rev. 03/03/2022
Expansion -
Treatment
Process Facility
Existing WWTP
SF Bay
Objectives
• Replace the existing liquids treatment process
with a new facility:
• Headworks, primary sedimentation, secondary
treatment (biological nutrient removal), tertiary
(membrane bioreactors), equalization basins
• Achieve early actor status on nutrient removal
• Increase wet weather management to 78
million gallons per day
• Title 22 effluent ready / Future recycled water
WWTP Upgrade & Expansion
Largest Capital Improvement Project in the History of the City
9 WWTP U&E, May 2020
Excavation and
Shoring
10 WWTP Upgrade & Expansion, Nov 2021
Piles; Foundation; and
Wall Rebar/Framework
11 WWTP U&E, March 2023
Process Facilities
Backup Generators
12 WWTP Upgrade & Expansion, March 2024
Headworks
13 WWTP Upgrade & Expansion, June 2024
Primary Clarifiers
Odor Control
14 WWTP Upgrade & Expansion, August 2024
BioActiflo
Primary
Clarifiers
Odor Control Pipes
15 WWTP Upgrade & Expansion, May 2024
Biological Nutrient Removal
(BNR) Basin
WWTP Upgrade & Expansion, February 2025
Membrane Bioreactor (MBR)
17 WWTP Upgrade & Expansion, February 2025
Double Contained Chemical (Teflon) Piping
18 WWTP Upgrade & Expansion, September 2024
Admin Building – Exterior Site Work
19 WWTP Upgrade & Expansion, September 2024
Admin Building – Conference Room
Admin Building – Laboratory
20 WWTP Upgrade & Expansion, November 2024
North and East Side of Admin Building
Concrete Works
Render of Pathway
21 WWTP Upgrade & Expansion
Reviewing and Negotiating Known & Potential Changes/Risks Construction Costs/Risks (~$19.5M):
• Flow equalization (FEQ) conversion and
valve pit differing site conditions
• HVAC material and labor escalation
• Stormwater pollution prevention (SWPP)
• Stormwater storage tank level controls
• Air aeration header deformation & piping
• Chemical dual containment piping
• Lighting at chlorine contact basins
• Fuel system changes
• Admin building fire suppression systems
• SCADA monitoring system programming
• Leak testing
• Tower Crane
• Traffic Control
• Asphalt
• Time impacts
• Additional risk contingency
Soft Costs due to Extended Schedule (~$5.3M):
• Project management
• Construction management
• Specialty inspections
• Insurance
• Engineering services during construction
Upcoming WWTP Construction Key Milestones
Dates Subject to Change
Existing Plant Chemical Area Improvements Mar 2025
All New Processes Areas Completed April 2025 Clean Water Testing Jan to July 2025 Plant Seeding June 2025 Plant Performance Testing July to Aug 2025 New Processes Operational Aug 2025 Potential Ribbon Cutting Ceremony Sep 2025 Conversion of Existing Aeration Basins July 2025 to Feb 2026 Finish All Site Work Mar 2026 Project Close Out Mar to Apr 2026 WWTP Contractor Provided Info: Unprecedented COVID, Supply Chain, Inflation Impacts April 2020
Sub-Bids
Submitted
Oct 2020
GMP-3 (~$380M)
Council Award;
begin
subcontracting
Jan 2021
Sub-Contracts in Place,
Start Construction
$30M
Value
Engineering
GMP-3 Procurement & Construction
% Change since Start Date
50 100
150
2021 2022 2023 2024
0 Producer Price Index (PPI) of Construction Commodities Over Time with Tariffs Cost Impacts:
• Equipment & materials escalation
• COVID protocols, CA Law
• Unplanned labor escalation
Schedule Impacts:
• Equipment/material lead times
• Labor issues
Copper & Brass Mill
Shapes
Conduit & Fittings
Fabricated Structural Steel
Steel Pipe & Tube
Metal Pipe FittingsCopper Wire & Cable
CWP 2017 BASELINE vs ESTIMATE AT COMPLETION (EAC)
UPDATEClean Water Program Projects Original 2017
Budget Current EAC Variance %
Variance
Program Management Clean Water Program $ 85,092,559 $ 70,613,310 $ (14,479,249) (17.0%) Basin 2 & 3 Collection System Improvements $ 150,269,411 $ 165,692,230 $ 15,422,819 10.3% East SM Sewer Lift Station Improvements $ 23,635,177 $ 26,087,948 $ 2,452,771 10.4% Annual Sewer Rehabilitations $ 53,105,656 $ 57,019,492 $ 3,913,836 7.4% Sewer CCTV Inspection $ 4,904,937 $ 5,909,096 $ 1,004,159 20.5% Other Collection System Projects $ 26,885,605 $ 25,895,970 $ (989,635) (3.7%) WWTP Immediate Action Proj (IAP) Package 1 $ 21,678,855 $ 18,621,628 $ (3,057,227) (14.1%) WWTP IAP Package 2 $ 13,021,372 $ 18,744,338 $ 5,722,966 44.0% WWTP IAP Package 3 $ 2,469,442 $ 17,797,112 $ 15,327,670 620.7% WWTP Annual Major Components $ 8,919,114 $ 21,845,582 $ 12,926,468 144.9% WWTP Upgrade & Expansion $ 532,708,966 $ 597,465,161 $ 64,756,195 12.2% Other WWTP Projects $ 2,119,969 $ 2,858,296 $ 738,327 34.8% Program Contingency $ 66,299,227 $ - $ (66,299,227) (100.0%) TOTALS $ 991,110,290 $1,028,541,163 $ 37,430,873 3.8%
Project Name Current Committed
Budget
25-26
Proposed
26-27
Planned
Total Project
Budget
Program Management Clean Water Program $ 71,488,000 $ (874,000) $ - $ 70,614,000 Collection System SCADA $ 2,660,065 $ (618,000) $ - $ 2,042,065 East SM Lift Station Improvements $ 24,525,421 $ 1,563,000 $ - $ 26,088,421 Basin 4 Collection System Improvements $ 6,956,000 $ (4,068,000) $ - $ 2,888,000 Sewer Flow Monitoring & Hydraulic Modeling $ 662,000 $ (172,000) $ - $ 490,000 Annual Sewer Rehabilitations $ 62,351,000 $ (5,331,000) $ - $ 57,020,000 Sewer CCTV Inspections $ 5,501,000 $ 409,000 $ - $ 5,910,000 WWTP Upgrade & Expansion $ 572,500,000 $24,957,000 $ - $ 597,457,000 WWTP IAP Package 2 $ 13,793,695 $ 4,951,000 $ - $ 18,744,695 WWTP Annual Major Components $ 10,994,000 $ 5,487,000 $ 5,365,000 $ 21,846,000 TOTAL $26,303,661 $ 5,365,000
Note: Only project accounts associated with the Clean Water Program that have anticipated budget requests are shown.
UPCOMING BUDGET REQUESTS FOR CWP PROJECTS
Subject to Revisions
WWTP Upgrade & Expansion
Estimated Construction Contract Cost at Completion
Values based on available cost data as of February 2, 2025 Package/Phase Award Date
Awarded
Contract
Amount
Council
Authorized
Contingency
Potential
Contingency
Needed in
Future
Potential
Cumulative
Contingency
Potential
Construction
Contract Amount
1 - Site Preparation May 2019 $ 33,098,178 $ 1,725,000 $ 0 $ 1,725,000 2 - Foundation May 2020 $ 17,716,049 $ 1,645,000 $ 0 $ 1,645,000 3 - Process Facilities Sept 2021 $ 379,880,747 $ 37,550,000 $ 19,507,000 $ 57,057,000 TOTALS $ 430,694,974 $ 40,920,000 $ 19,507,000* $ 60,427,000 $ 491,122,000
9.5% 14.0%**
* The Potential Contingency amount is included in the ~$25 million FY 25-26 budget request for the WWTP Upgrade & Expansion project.
** For CIP Construction Contracts, a contingency amount equal to 10% of the construction contract is typically authorized.
For contracts with higher risks, contingencies of 20% have been authorized.
History of Economic and Financial Strategy
FY 16/17: 12% Sewer Rate Increase (100% Usage Based Rate Structure) Agreement with Estero Municipal Improvement District/Foster City FY 17/18: 36% Rate Increase (100% Usage Based Rate Structure) FY 18/19 to 22/23: 5-Year Rate Increases (12% to 14%) & Restructured with 50% Fixed Rate $270M Wastewater Revenue Bonds (SM/FC)
$277M WWTP EPA WIFIA Loan (SM/FC)
$85M Collection System WIFIA Loan (SM Only)
$145M WWTP State Revolving Fund Loan (SM/FC)
Agreement with Hillsborough for Payment of Capital Costs FY 23/24 to 27/28: 5-year inflationary rate increases (3% per year) Agreement with County and CSCSD for Payment of Capital Costs Deryk Daquigan, PE
Deputy Director, Public Works Department
[email protected]
29 Thank you