AGENDA TITLE:
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Adopt a Resolution Authorizing City Manager to Execute Amendment No. 2 to Professional Services Agreement with Solenis, LLC, of Wilmington, DE, for Biosolids Dewatering Polymer ($100,000) (PW)
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MEETING DATE:
October 21, 2026
PREPARED BY:
Sean Nathan, Deputy Public Works Director
recommendation
RECOMMENDED ACTION:
Adopt a Resolution authorizing the City Manager to execute Amendment No. 2 to the Professional Services Agreement with Solenis, LLC, of Wilmington, DE, for Biosolids Dewatering Polymer in an amount not to exceed $100,000.
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BACKGROUND INFORMATION:
As part of the City’s wastewater treatment plant operation, a regular supply of flocculating polymer chemical is necessary in order to dewater the digester sludge prior to land application. The City’s contract with Solenis, LLC, began on September 30, 2023 and expired on September 30, 2026.
In April of 2025, the City installed new dewatering equipment, which utilized the polymer at a higher rate compared to the previous equipment. Due to the higher usage rate, the original contract funds were not sufficient to purchase the necessary polymer through the term of the contract.
On August 5, 2025, City Council authorized Amendment No. 1, which added $70,000 to the contract, for a total contract amount of $770,000.
In anticipation of the contract’s expiration, staff had released a performance-based Request for Proposal (RFP) in the summer. None of the polymers that were submitted for the RFP met the performance requirements; therefore, staff was forced to re-evaluate the approach and issued a new RFP. The proposals received were acceptable to staff, and a new supply contract is being awarded with a separate council item. This action, if approved, will allow the Solenis contract to be utilized to purchase the polymer until the new contract is fully executed.
Amendment No. 2, if approved, will add $100,000 to the contract and will extend the terms of the agreement through December 31, 2026.
FISCAL IMPACT:
This item has minimal long-term fiscal impacts; however, it is necessary to maintain operation of the City’s wastewater treatment plant.
FUNDING AVAILABLE:
This contract, including this additional amount, is funded by White Slough operating accounts that were previously approved in the adopted Fiscal Year 2025/26 and 2026/27 Budgets.