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: |
Beshoy Demyan, Senior Engineer; Somporn Boonsalat, Deputy Director of Engineering |
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Date: |
October 21, 2025 |
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Subject: |
CalTrans Cooperative Agreement for project oversight for SR120/Airport and SR120/Main Street Diverging Diamond Interchange Project Approval and Environmental Document Phase |
Recommendation:
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Adopt a resolution approving California Department of Transportation Cooperative Agreement 10-0591 for State Route 120/Airport Way Diverging Diamond Interchange (CIP 23031) and Cooperative Agreement 10-0592 for State Route 120/Main Street Diverging Diamond Interchange (CIP 23032) for project oversight for the Project Approval and Environmental Document Phase (PA&ED); 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:
The City of Manteca (“City”), in cooperation with the California Department of Transportation (Caltrans), and the San Joaquin Council of Governments (“SJCOG”), proposes to develop two new Diverging Diamond Interchanges (“DDI”) at SR120/Airport Way and SR120/Main Street (“Project”).
On March 2, 2023, the City approved Cooperative Agreements C-23-051 and C-23-052 with SJCOG allowing for disbursement of $500,000 in Measure K grant funding earmarked for regional congestion relief projects. Additionally, on March 14, 2023, the City approved agreement C2023-21 with Mark Thomas and Company, Inc., to develop the Project Study Reports (PSRs) for a total not-to-exceed amount of $499,792.00.
On September 22, 2023, the City approved Cooperative Agreement 10-0570 and 10-0571 with Caltrans for project oversight for an amount not-to-exceed $60,000.
On April 14, 2025, Caltrans approved the PSR for State Route 120/Airport Way DDI Project CIP 23031. On April 22, 2025, Caltrans approved the PSR for State Route 120/Main Street DDI Project CIP 23032.
On June 3, 2025, the City approved Cooperative Agreements C-25-072 and C-25-073 with SJCOG allowing for disbursement of $3,000,000 in Measure K grant funding earmarked for regional congestion relief projects to complete the PA&ED Phase.
The proposed Project will widen the current two-lane overcrossings to six lanes with a raised median using a DDI design and include:
- Signalized intersections to control the ramp terminals
- A grade-separated Ribbon Path to enhance bicycle and pedestrian access
The PA&ED phase for the Project will require CalTrans oversight per the attached Caltrans Cooperative Agreement 10-0591 for CIP 23031 and Cooperative Agreement 10-0592 for CIP 23032 to provide project oversight. The PA&ED will include the following:
- A comprehensive environmental study of the project’s' impacts
- Development of detailed engineering plans and specifications
- Detailed project cost estimates
- Recommendation of a preferred alternative
- Approval of final environmental document(s)
- Approval of monitoring and mitigation measures
Fiscal Impact:
There is no fiscal impact associated with this action.
Documents Attached:
1. Attachment 1 - Resolution
2. Attachment 2 - Cooperative Agreement 10-0591
3. Attachment 3 - Cooperative Agreement 10-0592
4. Attachment 4 - Project Location Map