It is an engineered septic field. I think pretty much everyone gets an engineered septic these days, simply because the towns want the maximum percolation layer for a given volume of production before the stuff reaches the native soil. I looked for the drawings but couldn't find them, so this is all from memory. The site had a shallow natural depression to the north that sloped both north and west. That area was layered with various absorptive and percolating layers plus structures (clay I think) to manage the flow rate. I don't remember the total depth of the fill, but the western end is the deepest to make the overall field level. And I don't remember the pipe structure. I know the pipes are set up for percolation, not evaporation, so the holes in the pipes are on the bottom. And there's a tank between the house and the field.
I think that's a pretty standard arrangement. When I bought cover seed for it, I was told to order 2 acres worth. I think the field is more like 1-1.5 acres though. That's for a 2 bedroom house with two showers, washer and dishwasher. The county doesn't differentiate weekend home versus full-time home. Septic has to be full-time.
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