All septic systems must be vented. There's no "if". The gasses must be evacuated from the tank in some way.
Venting is handled with a candy cane in the yard or with a roof vent pipe or both.
As far as adding soil, unless you're talking about adding multiple feet over existing coverage, adding a few inches of soil in order to grow grass isn't going to affect the leach field or tank provided those have been installed properly.
|