... drainfield or
pump vault
30-mil
PVC liner
4-in. slotted PVC
underdrain pipe
0. 5- to 0 .75 -in. rock
0. 375 -in. pea gravel
Filter sand
0. 5- to 0 .75 -in. rock
0 .75 -in. PVC lateral with 0.125-in.
orifices facing ... LLC
On-Site Wastewater Systems 5 27
University of Wisconsin, Madison (1 978 ). Management of Small Wastewater Flows: Small
Scale Waste Management Project, EPA-600/...