Bioretention cells are depressions in the landscape that capture stormwater before it can enter waterways. Stormwater is collected and percolated back down into the ground where it is filtered through a media or “bioretention soil.” The performance criteria sought in all bioretention soils include:
- High percolation rates to prevent surface ponding over 48 hours.
- Large capacity to sequester pollutants as water percolates through.
- Support for the growth of plant populations.
Read Bioretention / Rain Garden Mix
Our precision blend of sand, soil and compost provides these performance characteristics. The final mix shall have an organic content of between 2.5 and 4.0% by weight, pH of 5.5 to 7.0 and conform to the following gradation requirements for material passing a Number 10 sieve:
|#18||70 - 95%|
|#35||40 - 75%|
|#60||20 - 35%|
|#140||10 - 20%|
|#270||8 - 15%|
|Clay||2 - 5%|
- Maximum size aggregate = ½”
- Maximum retained on the 2mm sieve = 15%