Except for a couple of vacuum trucks parked by the barn and Miller-Bartz Septic decals on a couple of pickups, Mark and Shannon Hinterman appear to be typical farmers in Durand, Mich.Like many jack-of-all-trades farmers, the Hintermans run a sideline business – and theirs is a septic service. And a pit beneath the former dairy barn makes it a natural combination. The pit that once held manure from 120 dairy cows now stores up to 200,000 gallons of septage until it can be spread on the Hintermans’ property.That’s just the beginning. The Hintermans own 1,200 acres including two properties –
