RESOLUTION R2024-XX
RESOLUTION OF THE CITY COUNCIL OF THE CITY OF MANTECA, STATE OF CALIFORNIA, APPROVING AMENDMENT NO. 1 TO THE AGREEMENT FOR PROFESSIONAL SERVICES WITH CAROLLO ENGINEERS, INC. FOR THE WQCF SLUDGE THICKENER AND DEWATERING UNIT NO. 3 SYSTEM DESIGN PROJECT FOR AN AMOUNT NOT-TO-EXCEED $929,835, AND AUTHORIZING THE CITY MANAGER OR DESIGNEE TO EXECUTE THE AMENDMENT, APPLY FOR PERMITS, APPLY FOR STATE AND FEDERAL GRANTS, SOLICIT PROJECT FUNDING SUPPORT, COMPLETE AND EXECUTE ALL ASSOCIATED DOCUMENTS, AND TAKE ALL APPROPRIATE ACTIONS NECESSARY TO CARRY OUT THE PURPOSE AND INTENT OF THE RESOLUTION WHEREAS, on March 18, 2022, the City of Manteca (City) completed the Wastewater Quality Control Facility (WQCF) 2021 Capacity Assessment that recommends the installation of a third Dissolved Air Flotation Tank (DAFT) for the Waste Activated Sludge (WAS) thickening system and a third centrifuge for the dewatering system at the WQCF; and WHEREAS, on November 6, 2023, the City entered into an Agreement for Professional Services with Carollo Engineers, Inc. (Carollo) for the WQCF Sludge Thickener Unit No. 3 (CIP 24007) and Dewatering Unit No. 3 (CIP 24006) System Design Project (Project) to evaluate, design, and prepare biddable Project Plans, Specifications, and Estimates (PS&E) of these systems; and WHEREAS, the original project scope assumption was to add a third DAFT unit to the sludge thickener process and add a third Centrifuge unit to the dewatering process; and WHEREAS, during the initial Project evaluation, Carollo was required to prepare a Preliminary Design Report (PDR) evaluating the following alternatives:
1. Review addition of a third Dissolved Air Flotation Tank (DAFT).
2. Review technology change to Rotary Drum Thickeners (RDTs).
3. Review replacement of the existing DAFTs with Gravity Belt Thickeners (GBTs).
4. Analysis of co-thickening of the Primary Sludge (PS) and the WAS.
5. Review addition of a third centrifuge that matches the existing units.
6. Review addition of a third centrifuge with a higher capacity than the existing units.
7. Review replacement of the centrifuges with screw press technology; and WHEREAS, the Final PDR made the following recommendations:
Sludge Thickener
Design the new sludge thickening process to allow for co-thickening of primary sludge and secondary sludge to maximize the total solids concentration of the sludge feed to the digesters and homogenize the sludge feed to reduce process upsets.
Install new RDT technology which allows for co-thickening of primary sludge and secondary sludge.
Convert existing DAFs into sludge blending tanks and install required yard piping.
Replace MCC-E to support new process equipment.
Dewatering
• Continue with the design of the addition of a third centrifuge that matches the existing units as this is the most economical solution; and WHEREAS, the Final PDR recommendations required an increase to the current Project scope; and WHEREAS, staff completed negotiations for an increased scope and fee with Carollo for an amount not-to-exceed $929,835; and WHEREAS, the City Council has considered all information related to this matter, as presented at the public meetings of the City Council identified herein, including any supporting reports by City Staff, and any information provided during public meetings.
NOW, THEREFORE, BE IT RESOLVED, by the City Council of the City of Manteca, as follows:
The City Council hereby finds that the facts set forth in the recitals to this Resolution are true and correct, and establishes the factual basis for the City Council’s adoption of this Resolution.
The City Council hereby approves Amendment No. 1 to the Agreement for Professional Services with Carollo Engineers, Inc. for the WQCF Sludge Thickener Project (CIP 24007) and Dewatering Unit No. 3 System Design Project (CIP 24006) for an amount not-to-exceed $929,835.
The City Council hereby authorizes the City Manager or designee to execute the Amendment, apply for permits, apply for State and Federal grants, solicit project funding support, complete and execute all associated documents, and take all appropriate actions necessary to carry out the purpose and intent of the resolution.
This Resolution shall take effect immediately upon its adoption.
I HEREBY CERTIFY that the foregoing Resolution was duly adopted by the City Council of the City of Manteca at a public meeting of said City Council held on the 18th day of June, 2024, by the following vote:
AYES:
NOES:
ABSENT:
ABSTAIN:
MAYOR: __________________________
GARY SINGH
Mayor
ATTEST: __________________________
CASSANDRA CANDINI-TILTON
City Clerk
ATTACHMENT 1
R2024-XX Page PAGE 3 of NUMPAGES 3 June 18, 2024 R20XX-XX Page PAGE 1 of NUMPAGES 2 Type approved date of resolution here