Caltrans Headquarters - Stormwater Quality Monitoring Program - San Francisco – Oakland Bay Bridge Bioretention Pilot Project

In 2002, the California Regional Water Quality Control Board (RWQCB) San Francisco Bay Region issued a set of Waste Discharge Requirements (WDRs) to address post-construction stormwater runoff impacts associated with the proposed San Francisco-Oakland Bay Bridge East Span Seismic Safety Project (East Span Project). Caltrans associated Storm Water Management Plan (SWMP) was submitted to fulfill the requirements described in Provision D.10g of the WDR adopted by the RWQCB San Francisco Bay Region for the East Span Project. Provision D.10g of the WDR requires Caltrans to submit a final SWMP with final construction details and all other appropriate information associated with design elements from the original SWMP work plan.

To address the provisions of the SWMP, ADH has supported Caltrans since 2008, as a subcontractor on this five year study by providing programmatic and technical support to Caltrans District 4 decision makers to ensure successful implementation of the pilot project. ADH played a critical role, in consultation with Caltrans managers, to develop solutions to site-specific monitoring, sampling, and analyses challenges that were endemic to the implementation of the study. ADH successfully installed and operated over a dozen automated monitoring and sampling stations necessary to test the effectiveness of six bioretention basins to attenuate influent stormwater of a wide variety of physical, chemical and biological pollutants.