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: |
July 30, 2025 |
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Subject: |
WQCF Sludge Thickener & Dewatering Unit No. 3 Project CIP Nos. 24006 & 24007 - Approval of Agreement for Construction Management and Inspection Services |
Recommendation:
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Adopt a resolution approving an Agreement for Services with West Yost for an amount not-to-exceed $1,500,000 to provide construction management and inspection services for the WQCF Sludge Thickener & Dewatering Unit No. 3 Project CIP Nos. 24006 & 24007 and authorize up to $687,512 in contract amendments; 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 improvement projects needed to optimize 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. Sidestream Treatment (in Design)
9. Centrifuge No.3 or Equivalent (included in this project, CIP 24006)
10. Add DAF No.3 or Equivalent (included in this project, CIP 24007)
On November 6, 2023, the City entered into an Agreement C2023-136, for Professional Services with Carollo Engineers, Inc. (“Carollo”) to evaluate, design, and prepare biddable project Plans, Specifications, and Estimates (PS&E) for the WQCF Sludge Thickener (CIP No. 24007) and Dewatering Unit No. 3 (CIP No. 24006) Project (“Project”).
On August 1, 2024, the City executed Amendment C2023-136-A1 to the Agreement C2023-136 for an expanded design and environmental services as recommended in the Preliminary Design Report for the Project.
On December 17, 2024, the City Council approved the Project plans and specifications and authorized the Call for Bids.
On January 29, 2025, the City issued a Request for Proposals (“RFP”) for Construction Management & Inspection Services (“CMIS”) for the Project. The deadline to submit questions and/or inquiries was on March 3, 2025 and responses to questions/inquiries was published on the City’s website on March 6, 2025.
On March 11, 2025, the RFP solicitation closed and the City did not receive the minimum threshold of three proposals for a competitive procurement process.
On April 3, 2025, the City re-issued the RFP for CMIS for the Project. The deadline to submit questions and/or inquiries was on May 1, 2025 and responses to questions/inquiries received prior to the deadline were published on the City’s website on May 5, 2025.
On April 15, 2025, the City Council awarded the construction contract C2025-66 to C. Overaa & Co (“Overaa”), approved Amendment C2023-136-A2 with Carallo to provide engineering support during the construction phase, and approved a project contingency for the Project.
On May 8, 2025, the City received proposals for CMIS from the following firms:
• 3D Built
• Brown & Caldwell
• Carollo Engineers, Inc.
• Hazen & Sawyer
• West Yost
City staff convened a committee to review the proposals received based on the advertised criteria and determined that West Yost is the most responsible, responsive, qualified firm, and meets the specific goals of the Project. Staff has completed cost negotiations with West Yost for an amount not-to-exceed $1,500,000.
Fiscal Impact:
The Design, Construction, Construction Management & Inspection, and Contingency cost for the WQCF Sludge Thickener (CIP No. 24007) and Dewatering Unit No. 3 (CIP No. 24006) Project is $29,061,818.
The expense breakdown of the total project cost is as follows:
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Description |
Original Contract |
Amendment No. 1 |
Amendment No. 2 |
Contingency |
Total |
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Design (Carollo): |
$966,983 |
$929,835 |
$800,000 |
- |
$2,696,818 |
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Construction (Overaa) |
$22,865,000 |
- |
- |
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$22,865,000 |
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CMIS (West Yost) |
$1,500,000 |
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$1,500,000 |
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Project Contingency |
- |
- |
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$2,000,000 |
$2,000,000 |
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Total |
$25,331,983 |
$929,835 |
$800,000 |
$2,000,000 |
$29,061,818 |
A portion of the total project costs, $10,371,925 is within the Fiscal Year 2025 Capital Improvement Program Budget, $8,200,000 is within the Fiscal Year 2026 Capital Improvement Program Budget, and $14,000,000 to be programmed in the Fiscal Year 2027 Capital Improvement Program Budget, all allocated amongst CIP projects 24006 and 24007 in Funds 640 Sewer O&M and 650 Sewer Improvement.
Project funding breakdown is as follows:
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Description |
FY25 Amended Budget |
FY26 Budget |
FY27 Future Funding |
Total Budget |
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CIP 24006 |
$3,594,217 |
$3,800,000 |
$0 |
$7,394,217 |
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CIP 24007 |
$6,777,708 |
$4,400,000 |
$14,000,000 |
$25,177,708 |
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Total |
$10,371,925 |
$8,200,000 |
$14,000,000 |
$32,571,925 |
Documents Attached:
1. Attachment 1 - Resolution
2. Attachment 2 - Agreement with West Yost
3. Attachment 3 - Location Map