City of Patterson
Water Quality Control Facility (WQCF)
Phase 3A Expansion –
Award of Contract for Construction
PRESENTATION AGENDA
u The importance of this project
u Proposed Project Improvements
u Construction bidding
u Construction Costs
u Funding
u Recommendation
14901 POPLAR AVE.
THE IMPORTANCE OF THIS PROJECT
u The WQCF Phase 3A Expansion increases the overall treated design flow capacity and maintains the effluent quality.
u To meet the future increased flow requirements and higher quality effluent, upgrades are being made to both the primary, secondary filtration and disinfection treatment processes of the existing WQCF.
u The WQCF consists of three separate processes: The North Activated Sludge Treatment System (NASTS), the Advanced Integrated Pond System (AIPS), and the South Activated Sludge Treatment System (SASTS). The key objective of the planned improvements for the WQCF is to elevate the treatment capacity of all three treatment systems.
u Without this vital project, the City cannot accommodate new growth.
THE IMPORTANCE OF THIS PROJECT
Peak Hourly Flow
Capacity (MGD)
Average Annual Dry Weather
Flow Capacity (MGD)
Description
2.6(3) 1.0(1)
North Activated
Sludge Treatment
System (NASTS)
3.2(2) 1.25(1)
South Activated
Sludge Treatment
System (SASTS)
0.5(3) 0.2(1)
Advanced
Integrated Pond
System (AIPS)
Total 2.45 6.3
Sources:
1) Waste Discharge Requirement Order
R5-2018-0070-001
2) Provided 2004 As-Builts
3) Provided 2018 As-Builts
Existing Permitted Capacity
THE IMPORTANCE OF THIS PROJECT
Peak Hourly Flow
Capacity (MGD)
Average Annual Dry
Weather Flow Capacity
(MGD)
Description
2.45 4.0 North Activated Sludge
Treatment System (NASTS)
3.2(2) 1.25(1) South Activated Sludge
Treatment System (SASTS)
0.0 0.0
Advanced Integrated Pond
System (AIPS)
[REPURPOSED AS
EMERGENCY STORAGE]
Total 3.7 7.2
Proposed Permitted Capacity
After Phase 3A Expansion
Sources:
1) Waste Discharge Requirement Order
R5-2018-0070-001
2) Provided 2004 As-Builts
PROPOSED PROJECT IMPROVEMENTS
u The Project will expand the City’s wastewater system by introducing improvements to multiple stages of treatment throughout the WQCF to accommodate future wastewater flow demands of the City’s anticipated rapid growth
§ Improvements to influent pump station
§ Improvements to headworks
§ Improvements to north plant
§ Installation of Membrane Bioreactor (MBR) superstructure § Improvements to the south plant
§ Installation of sludge dewatering and drying infrastructure § Paving of access roads
§ Improvements to Operations systems and programs
IMPROVEMENTS
TO INFLUENT
PUMP STATION
IMPROVEMENTS
TO HEADWORKS
IMPROVEMENTS
TO NORTH
PLANT
INSTALL MBR
SUPERSTRUCTURE
IMPROVEMENTS
TO SOUTH PLANT
INSTALL
DEWATERING
INFRASTRUCTURE
CONSTRUCTION BIDDING
u Project was advertised for Construction December 2024 u Construction Bids opened February 19, 2025
u Engineer’s Estimate for the cost of construction during bidding phase:
§ $17.10 million
• Concerns of underestimated cost from prospective bidders and material suppliers during bidding
u Bids Received:
§ Auburn Constructors: $28.49 million – Apparent low bidder § Clark Bros.: $32.69 million
§ Steve P. Rados: $35.37 million
CONSTRUCTION COSTS
u Cost reevaluation to determine if bids received are viable and accurate § Costs missing from Engineer’s Estimate or clarified during bidding process, including but not limited to the generator
§ Revision of unit costs to current market conditions
§ Revision of overhead costs
§ Updated Engineer’s Estimate: $26,348,704
§ City Staff and design engineer agree these bids reflect the current construction costs and proceeding with this project is in the best interest of the City
§ Construction Budget Breakdown
§ $ 28,488,300.00 Base Bid Auburn Constructors
§ $ 2,848,830.00 10% Contingency
§ $ 31,337,130.00 Total
FUNDING
u Available funding :
§ Current Funds on Hand
• Residential (Villages of Patterson) CFD 2018-1 (Fund 180) = $7,130,048.76 (Bond Proceeds)
• West Patterson Business Park CFD 2005-1 (Fund 191) = $5,395,129.76 (Bond Proceeds)
• Self Help CFD Pre-Payment (Fund 180) = $1,052,839.00
• Direct Funding of Facilities from Assessments (Fund 180) = $961,384.11
• Sewer Impact Fees (Fund 416) = $252,074.26
• Total Funding on Hand = $14,791,475.89
FUNDING
§ Future Bond Issuance
• Expected 2025-2026
o Residential (Baldwin Ranch) CFD 2022-2 (Fund [TBD]) = $5,713,413 (Estimated Bonding Capacity as of 10/31/2024) o West Patterson Business Park CFD 2005-1 (Fund 191) = $8,570,119 (Estimated Bonding Capacity as of 11/13/2024)
• Future Bond Issuance- Expected Toward End of Project
o Residential (Villages of Patterson) CFD 2018-1 (Fund 180) = $2,262,122.11 (Estimated Bonding Capacity as of 10/31/2024) • Future Bond Issues = $16,545,654.11
§ Total Funding for the Project = $31,337,130.00
RECOMMENDATIONS
u Award construction contract to Auburn Constructors at a value of $28.49 million
§ Cost reevaluation indicates $28.49 million is an acceptable cost for construction of this Project
§ Sufficient funding available for construction in across multiple accounts totaling $31,337,130.00
§ Provides much needed expansion in capacity for present and future wastewater demands
QUESTIONS?