A-1 Bioretention Soil Mix
A-1 Bioretention Soil Mix #8 is a blend of 80% washed coarse
sand and 20% sandy loam topsoil. The blended material is low in
silt and clay which allows the material to perform at the
required minimum drainage properties of ˃ 5” per hour KSat
Perc Rate @ 85% relative compaction. This satisfies civil
engineering requirements while maintaining the agronomical
properties of a well-graded sand with silt to satisfy the
landscape architect’s desire to support
The uniform sand sizes of A-1 Bioretention Soil Mix results in long-lasting pore space and moisture capacity for a reasonably priced, readily available, consistent source of an appropriate soil medium to comply with State Water Quality requirements.
*NOTE; Organic matter may be incorporated into the A-1 Bioretention Soil by volume percentage when requested by the customer for an additional cost that will vary depending on the desired type and percentage requested. It is recommended that organic matter is incorporated into the soil medium’s top six inches after installation to relieve compaction or in the planting hole for trees or shrubs to concentrated the amendment where it will benefit the plants and restrict water movement.
A-1 Bioretention Soil Mix #8 is a soil
medium for Bioretention Basins and Swales which helps remove
contaminants from stormwater runoff as required by the State
of California Regional Water Quality Control Board and other
government agencies charged with enforcement of these
requirements. The ultimate goal is to help prevent
contamination of the downstream beneficial water sources of
*NOTE: All materials should be sampled, submitted, and approved prior to shipment or installation as job plans and specifications vary greatly. It is the customer’s responsibility to assure the soil is approved before installation!
A-1 Bioretention Soils should be installed per construction plans or engineers specifications. Compaction should be avoided and ideally, the soil should be installed at less than optimum moisture.
Sieve Analysis % Passing
- #8 40-60
- #200 <15
- USDA Soil Classification Very Gravelly Sand
- PH Range 6.5-8
- KSat (Perc Rate) <5.0 inches/hr @ 85% Compaction (Compaction affects permeability)
- Sand 80-90
- Topsoil 20% added topsoil (sand component in topsoil shows up in final mix evaluation)
- Silt and Clay5% - 15% (from added topsoil)
*Analysis based on UN-AMENDED soil. Amendments added by volume and type requested.
Specification data subject to change. Additional data
available upon request.
Limitation of Warranties: Seller makes no warranty of any kind, express or implied, regarding the materials; and all warranties, including any implied warranty of merchantability and any implied warranty of fitness for a