On Thursday, December 21, 2017 at 4:30:53 PM UTC-5, wrote:
I'd just go with a dirt foundation. Just spray some roundup on the area and also three extra feet on each side. Get a pile of dirt and spread it around where you just applied the roundup.

Which makes the just applied Roundup useless. Roundup (glyphosate) works by contact with
growing vegetation. On bare ground it's useless. Covered up with soil it's
doubly useless.