Toxicity Identification Evaluation (TIE) Services

The contract requires the performance of a Toxicity Identification Evaluation (TIE) to determine the specific contaminants responsible for effluent toxicity using standardized EPA TIE protocols across three distinct phases: characterization, identification, and confirmation. The work involves systematic laboratory testing and analytical procedures to isolate, attribute, and verify the toxic agents within wastewater or discharge samples, ensuring compliance with environmental regulatory standards. The subcontractor must apply scientifically validated methods to accurately trace toxicity sources and deliver defensible data supporting remediation or compliance efforts. This subcontract is issued by the City of Stockton under NAICS code 541620 for environmental science and related services, with a response deadline of September 3, 2026. The project is not subject to any set-aside provisions and is intended to support the city's environmental monitoring and water quality management objectives. The place of performance and point of contact details are unspecified, but all work must adhere strictly to EPA TIE guidelines and deliver results that can be used for regulatory reporting or permitting decisions.