Unofficial Notice of Invitation to Bid (NIB)

San Diego County is seeking bids from qualified and interested contractors for the following project titled, Tijuana River Valley Chemical Pollution Impact Investigation: Exposure Characterization Study, identified under Solicitation ID: 13010. Work is to be performed near 5500 Overland Ave, San Diego, CA 92123, USA in San Diego County.

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General Project Description

The project requires a contractor to design, implement, and conduct an Exposure Characterization Study for the County of San Diego's Tijuana River Valley Chemical Pollution Impact Investigation. The study aims to identify, characterize, and model key atmospheric chemical pollutants impacting public health due to cross-boundary sewage and pollution flow in the Tijuana River Valley. The scope includes taking samples of emissions, chemically analyzing them, identifying pollutants, assessing emission rates, modeling atmospheric dispersion using tools like AERMOD/CALPUFF, conducting field validation through air sampling, comparing modeled concentrations to OEHHA Reference Exposure Levels, and developing a web-based exposure software model. The study will focus on residential, school, and community areas within Imperial Beach, Nestor, San Ysidro, and surrounding Tijuana River Valley communities. Data collection and reporting, including draft and final study protocols and quarterly progress reports, along with community engagement, are also required.

General Bid Items

Quantity: 1 Unit: Each Work Item: Draft Study Protocol, Field sampling sites and laboratory locations. (Completion: Within 30 days of contract award)
Quantity: 1 Unit: Each Work Item: Final Study Protocol. (Completion: Within 15 days of receiving County's feedback after draft Study Protocol is submitted)
Quantity: 1 Unit: Each Work Item: Preliminary list of airborne chemicals. (Completion: 6 months from contract award)
Quantity: 1 Unit: Each Work Item: Modeling atmospheric dispersion, conducting field validation and comparing modeled concentrations. (Completion: 9 months from contract award)
Quantity: 1 Unit: Each Work Item: Interim report broadly defining high, medium, and low exposure areas. (Completion: 60 days prior to end of contract term)
Quantity: 1 Unit: Each Work Item: Final report (accompanied by Emission dataset, Exposure monitoring dataset, Data dictionaries, Web-based exposure model with user guide). (Completion: 30 days prior to end of contract term)

NAICS Classification

NAICS 541620 – Environmental Consulting Services (Designing, implementing, and conducting an exposure characterization study, including chemical analysis, atmospheric modeling, and field validation in a chemically polluted area)., NAICS 541715 – Research and Development in the Physical, Engineering, and Life Sciences (except Biotechnology) (Performing scientific research, data collection, and modeling related to chemical pollution and human exposure)., NAICS 541690 – Other Scientific and Technical Consulting Services (Providing technical expertise and consulting for pollution impact investigation and developing a web-based exposure model).

Records and Due Date

This bid opportunity was entered into BidAmerica on February 12, 2026, and was last updated on February 12, 2026. All bids and/or proposals are due on February 25, 2026.

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Legal Disclaimer

All bidders are responsible for reviewing and verifying all official bid documentation directly from the issuing agency. BidAmerica aggregates public bid information for advertisement purposes for contractors and government agencies convenience. This Notice of Invitation to Bid is for reference purposes only and is not an official or complete representation of any documents issued by San Diego County. BidAmerica does not guarantee the accuracy, completeness, or timeliness of any information displayed and shall not be held liable for any errors, omissions, misinterpretations, or damages resulting from reliance on this summary. Contractors must obtain all official information—including plans, specifications, addenda, deadlines, submission requirements, qualifications, and bidding conditions—directly from San Diego County prior to bidding.