City Council Agenda
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Memo to: |
Manteca City Council |
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From: |
Kevin Jorgensen II, Director of Engineering/City Engineer |
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Prepared by: |
Kyzen Nicolas, Associate Engineer; Somporn Boonsalat, Deputy Director of Engineering |
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Date: |
October 21, 2025 |
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Subject: |
WQCF Ammonia Side Sstream Treatment (CIP No. 250054) and UV System Rehabilitation Project (CIP No. 250045) - Design-Build Firms Shortlist Approval |
Recommendation:
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Adopt a resolution approving the shortlist of three qualified Design-Build Firms to proceed with the Progressive Design-Build procurement process for the WQCF Ammonia Side Sstream Treatment (CIP No. 25005) and Ultra-Violet Disinfection System Rehabilitation (CIP No. 25004) Project and authorizing the City Manager or designee to take all appropriate actions necessary to carry out the purpose and intent of the resolution.
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Background:
In March 2022, the City of Manteca (“City”) completed a capacity assessment study (“Study”) for the Wastewater Quality Control Facility (“WQCF”). The Study identified 10 interim improvements needed to improve the WQCF treatment process:
1. Glycerin Injection System (completed and in-service)
2. Replace Waste Activated Sludge (“WAS”) Pumps (completed and in-service)
3. Replace Return Activated Sludge (“RAS”) Pumps (completed and in-service)
4. Replace Internal Mixed Liquor Recycle Pumps (in construction)
5. Fix Flow Split to North Plant Aeration Basin (in construction)
6. Add New Independent Mixing System to Zone B (in construction)
7. Add Process Aeration Control to Improve Monitoring and Control of Denitrification (in construction)
8. Ammonia Side Sstream Treatment (included in this project, CIP 250054)
9. Centrifuge No.3 or Equivalent (in construction)
10. Add DAF No.3 or Equivalent (in construction)
In March 2024, the City adopted the 2024 Wastewater Master Plan which identified additional interim improvement projects needed to improve the WQCF treatment process and among them is the Ultra-Violet Disinfection System Rehabilitation (CIP 250045).
On August 6, 2024, the City entered into an Agreement C2024-120 for Professional Services with Carollo Engineers, Inc. (“Carollo”) for the preparation of a preliminary design report (PDR) as a basis of design for the Ammonia Side Sstream Treatment (CIP No. 25005) and Ultra-Violet (“UV”) Disinfection System Rehabilitation (CIP No. 25004) Project (“Project”) to ensure continued permit and regulatory compliance.
In January 2025, Carollo completed the PDR and recommended the following:
• Sidestream treatment facilities for treatment of centrate by the Anita Mox deammonification process
• New UV disinfection structure with Trojan UVSigna 2-Row system
• New electrical building for UV system
• Yard piping, paving and grading, and other site civil improvements as needed
On May 5, 2025, the City executed Amendment C2024-120-A1 to Agreement C2024-120 for an expanded task to delivering the Project via Progressive Design-Build.
The Progressive Design-Build delivery method allows the City and Carollo team (“City Team”) to develop the Project to approximately 30% design and provide enough information for a team of Design Consultant and Contractor (“DB Firm”) to complete the design and provide a guaranteed maximum pricing. The advantages to a Progressive Design-Build delivery method are:
• The City Team continues to participate in the design decision making process
• The Contractor is involved early in the design process
• Equipment can be ordered as soon as design packages are approved
• Reduced construction conflicts
• Reduced project delivery timeline
On April 1, 2025, the City issued a Request for Qualifications (“RFQ”) for Progressive Design-Build Services for the Project. The deadline to submit questions and/or inquiries was on May 1, 2025 and responses to questions/inquiries were published on the City’s website on May 15, 2025.
On May 20, 2025, the City received four Statement of Qualifications (“SOQs”) from the following DB Firms:
• C. Overaa & Co.
• GSE Construction Company, Inc.
• PCL Construction West Coast Inc.
• Shimmick Construction Company, Inc.
City staff convened a committee to review the SOQs received based on the advertised criteria and determined that the following DB Firms are the most qualified to be short-listed:
• C. Overaa & Co.
• PCL Construction West Coast Inc.
• Shimmick Construction Company, Inc.
Only the short-listed DB Firms will be allowed to submit a proposal for the City’s consideration and approval.
Fiscal Impact:
There is no fiscal impact associated with this action.
Documents Attached:
1. Attachment 1 - Resolution
2. Attachment 2 - Shortlist of DB Firms
3. Attachment 3 - Draft RFP
4. Attachment 4 - Location Map