Professional Engineering Services for WQCF Dilution Study & Thermal Plan Exception Analysis Report

The City of Manteca is soliciting proposals for professional engineering services to conduct a Dilution Study and Thermal Plan Exception Analysis Report for its Wastewater Quality Control Facility. The primary objectives of this project are to support the revision of water-quality based effluent limits within the National Pollutant Discharge Elimination System, determine revised ammonia and dieldrin effluent limits under the State Implementation Policy, and evaluate compliance with the State Water Quality Control Plan for Control of Temperature. The selected consultant will be responsible for data collection, modeling, and the preparation of a technical memorandum and final report, while identifying cost-efficient compliance alternatives if a thermal plan exception is not granted. Proposals are due by October 15, 2026, at 5:00 PM PST, with requests for clarification accepted until October 9, 2026. The City will award the contract based on a weighted evaluation of project management, project understanding, project approach, and experience, each accounting for 25 percent of the total score. The resulting agreement is expected to be an Actual Cost with a Not to Exceed Amount contract, with final scope and fees negotiated with the top-ranked firm. Requirements for the selected consultant include adherence to California Prevailing Wage laws, strict quality assurance and quality control procedures, and the provision of financial disclosures such as SEC Form 10-K or 10-Q.