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: |
April 15, 2025 |
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Subject: |
Amendment No. 1 with Carollo Engineers, Inc. (C2024-120) in the amount of $579,422 for the WQCF Ammonia Sidestream Treatment Capital Improvement Program Project (CIP No. 25004) and UV System Rehabilitation Capital Improvement Program Project (CIP No. 25005) |
Recommendation:
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Adopt a resolution approving Amendment No. 1 to the Agreement for Professional Services with Carollo Engineers, Inc. for the WQCF Ammonia Sidestream Treatment (CIP No. 25005) and Ultra-Violet Disinfection System Rehabilitation (CIP No. 25004) Project for an amount not-to-exceed $579,422 and authorizing the City Manager or designee to execute the Amendment and 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 among them was the Ammonia Sidestream Treatment Project:
1. Glycerin Injection System (completed and in-service)
2. Replace Waste Activated Sludge (WAS) Pumps (in construction)
3. Replace Return Activated Sludge (RAS) Pumps (in construction)
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 Sidestream Treatment (included in this project)
9. Centrifuge No.3 or Equivalent (bids received March 2025)
10. Add DAF No.3 or Equivalent (bids received March 2025)
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.
On August 6, 2024, the City entered into an Agreement (C2024-120) for Professional Services (Attachment 3) with Carollo Engineers, Inc. (Carollo) for the preparation of a predesign report (PDR) as a basis of design for the Ammonia Sidestream Treatment (CIP No. 25005) and Ultra-Violet (UV) Disinfection System Rehabilitation (CIP No. 25004) Project (“Project”) to ensure continued permit and regulatory compliance.
Carollo has completed the PDR in January 2025 that recommends the following:
• Sidestream treatment facilities for treatment of centrate by the Anita Mox De-Ammonification 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
Staff explored a variety of alternative delivery methods beyond the standard Design-Bid-Build to try and accelerate the project delivery schedule to continue to meet current treatment requirements. Staff concluded that the Progressive Design Build (PDB) delivery method allows for the best balance for control of scope, fee, and schedule as City or City’s Agent would work directly with the PDB team to work on the design and start construction at the same time.
Staff recommends approving Amendment No. 1 (Attachment 2) to the Agreement to expand Carollo’s tasks and fee in the amount of $579,422 to serve as the City’s Agent in moving forward with delivering the projects via a PDB method due to the following:
• The PDB process will allow these critical plant capacity projects to be completed most expeditiously.
• The Ammonia Sidestream treatment is a new process that can be designed/constructed in parallel with current plant processes.
• After initial evaluation, the best alternative to updating the UV system is to install a parallel system to operate alongside existing units.
• Progressive Design-Build could allow for the ordering of long lead items and starting phases of construction as early as Summer 2025.
Fiscal Impact:
There is sufficient funding in the FY25 Capital Improvement Program Project Budgets (CIP 25004 & 25005) for this recommendation.
The Projects (CIP 25004 & 25005) Funding needs are as follows:
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Description |
Amount |
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Agreement C2024-120 |
$615,322 |
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10% Project Contingency |
$61,532 |
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Amendment No. 1 to Agreement C2024-120 (This Agenda Item) |
$579,422 |
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Total |
$1,256,276 |
The Projects (CIP 25004 & 25005) Funding available are as follows:
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Fund 650 (Sewer Improvement)Amount |
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UV System Upgrade Project CIP No. 25004 |
$9,790,000 |
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Sidestream Treatment Project CIP No. 25005 |
$9,100,000 |
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Total |
$18,890,000 |
Documents Attached:
1. Attachment 1 - Resolution
2. Attachment 2 - Amendment No. 1 to the Agreement C2024-120
3. Attachment 3 - Agreement C2024-120
4. Attachment 4 - Location Map