Sand
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- Coarse sand for LID construction shall be washed clean and free of toxic materials.
- The pH of the sand shall be ≤ 7.0.
- The coarse sand shall have a fineness modulus index between 2.8 and 3.1 according to ASTM C33/C33M, or otherwise meet the gradation below.
Sieve | Percent passing |
---|---|
9.5 mm | 100 |
4.75 mm (No.4) | 95 - 100 |
2.36 mm (No.8) | 80 - 100 |
1.18 mm (No.16) | 50 - 85 |
0.60 mm (No.30) | 25 - 50 |
0.30 mm (No.50) | 5 - 30 |
0.15 mm (No.100) | 0 - 10 |
0.075 mm (No.200) | ≤ 3 |