Building septic leach field. Need help calculating total yards of stone and sand for system.
System is 20' x 40', open system. laying 160' of leach piping in 2' x 3' trenches. Need to cover with 2' of 1 1/2 washed stone and top off with 1' if washed sand.
Need to order stone and sand but geometry not my fav subject.
Stone will be 2' x 2' in trench and topped off with 1' sand.
my calculation is;
Stone = 2' x 2' = 4' x 160' = 640 divided by 27 (cubic ft. in cubic yd) = 24 cubic yards but seems like alot.
Sand appears to be 12 cubic yards ???????