Also, it is not wise to eat vegetables grown over drainfield lines see Dorn, S. It is hard to say what it will affect, not knowing which way it is off level. The grade pole is now set to the depth that you need. Depends on how cold it gets. The soil is teeming with life.
The pipe should sit on a 2- or 3-inch bed of drain rock to allow rainwater to drain, so take this extra depth into account when digging.
A Beginner's Guide to Septic Systems
With a gravity flow type of tank, do I have to worry about tree roots growing into the drainage area? I have heard that brown or dead grass is preferable so that your field can breathe. The second extends from the tank to the drainage field, where fluids from the tank disperse into the ground. The perforated pipe should be suspended in the upper portion of the rock. Chris Deziel has a bachelor's degree in physics and a master's degree in humanities.