Sand

Particle size distribution graph, as described in table

• Coarse sand for LID construction shall be washed clean and free free of toxic materials.
• The pH of the sand shall be ≤ 7.0.
• Manufactured sand from limestone or dolostone parent material is not acceptable.
• Sand manufactured from crushed recycled glass is available locally, and is a viable alternative.
• 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.

Particle size distribution

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

Mineral particles which are smaller than 2 mm, and which are free of appreciable quantities of clay and silt. Coarse sand usually designates sand grains with particle size between 0.2 and 0.02 mm.

Low Impact Development. A stormwater management strategy that seeks to mitigate the impacts of increased urban runoff and stormwater pollution by managing it as close to its source as possible. It comprises a set of site design approaches and small scale stormwater management practices that promote the use of natural systems for infiltration and evapotranspiration, and rainwater harvesting.

Mineral particles which are smaller than 2 mm, and which are free of appreciable quantities of clay and silt. Coarse sand usually designates sand grains with particle size between 0.2 and 0.02 mm.