Site Soil Infiltration Testing
Bioretention Facility Soil
Bioretention Soil Media (BSM) is a critical element of the bioretention system. The BSM has a ratio of inorganic and organic materials to allow the appropriate infiltration rates for stormwater; facilitate pollutant removal through chemical, biological and physical processes; and provide a sufficient growing medium for plants. Research is still being conducted to determine the ideal specification for BSM.
Currently, the Central Coast Water Quality Control Board allows use of two BSM specifications:
- The Bay Area Stormwater Management Agencies (BASMA) developed a technical report that includes a BSM specification.
BASMA Technical Report and BSM Specification
- A BSM specification was developed for the San Diego Region that includes a slightly lower compost percentage.
San Diego Region BSM Specification with accompanying Memorandum