ARSD 74:02:04:31. Driven well casing to be sealed with bentonite

The casing for a driven well shall be sealed with bentonite as the casing is driven by pouring dry granular bentonite around the casing at the ground surface. The granular bentonite must be an 8 x 20 mesh or 16 x 60 mesh material. A driven well may not be used as a public water supply well.