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Wether the system is on a slope or flat the gradiant of the lines in the system should comply with local septic codes.
You call him the "Septic Guy" if he is a licenced septic installer he should know all the laws.
The bed of the leaching field should come out of the D-Box or distribution box at a downward slope of no more then 1/4 inch per foot this so if it is on a slope the ditch on the upper end may be quite deep as will the tank and D-Box so the lower end of the leaching field is under ground the proper requiered depth.
Gerry
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