Sand material specifications
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| Parameter | pecification | Size | Notes |
|---|---|---|---|
| Sand | clean AASHTO M-6 or ASTM C-33 concrete sand | 0.02” to 0.04” | Sand substitutions such as Diabase and Graystone #10 are not acceptable. No calcium carbonated or dolomitic sand substitutions are acceptable. Rock dust cannot be substituted for sand. |
| Under-drain Gravel | AASHTO M-43 | 1.5” to 3.5” | |
| Geotextile Fabric (if required) |
ASTM D-4833 (puncture strength - 125 lb.) ASTM D-1117 (Mullen Burst Strength - 400 psi) ASTM D-4632 (Tensile Strength - 300 lb.) |
0.08” thick equivalent opening size of #80 sieve | Must maintain 125 gpm per sq. ft. flow rate. Note: a 4” pea gravel layer may be substituted for geotextiles meant to separate sand filter layers. |
| Impermeable Liner (if required) |
ASTM D-4833 (thickness) ASTM D-412 (tensile strength 1,100 lb., elongation 200%) ASTM D-624 (Tear resistance - 150 lb./in) ASTM D-471 (water adsorption: +8 to -2% mass) |
30 mil thickness | Liner to be ultraviolet resistant. A geotextile fabric should be used to protect the liner from puncture. |
| Under-drain Piping | ASTM D-1785 or AASHTO M-278 | 8” rigid schedule 40 PVC | 3/8” perf. @ 6” on center, 4 holes per row; minimum of 3” of gravel over pipes; not necessary underneath pipes |
| Concrete (Castin-place) | See local Standards and Specs. f’c = 3,500 psi, normal weight, airentrained; re-enforcing to meet ASTM 615-60 | n/a | on-site testing of poured-inplace concrete required: 28 day strength and slump test; all concrete design (cast-in-place or precast) not using previously approved State or local standards requires design drawings sealed and approved by a licensed professional structural engineer. |
| Concrete (precast) | per pre-cast manufacturer | n/a | SEE ABOVE NOTE |
| non-rebar steel | ASTM A-36 | n/a | structural steel to be hotdipped galvanized ASTM A-123 |