I am working on a rural subdivision in which each lot will have it's own mound system. During construction, we typically stake and rope off the proposed septic fields so that they are left undisturbed during construction. The issue I am running into is that the one lot has to have 2' of fill placed on it in order to allow for proper drainage. If I was to add this fill and leave the septic area untouched I would basically have a 2' foot depression for the septic field. I know that this would not be allowed so looking for some alternative solutions. Most people I've talked with have said that I need to basically install the mound system the same time as the mass grading of the site. Wondering if we could mass grade site as normal but then for the septic area add additional fill but place will a low impact dozer. Then when someone buys the lot they could remove the fill down to the natural earth and construct the mound system?