74:11:08:05.01Plugging and sealing single unconfined aquifers.
Section · Administrative Rules of South Dakota · View on sdlegislature.gov ↗
Test holes that penetrate a single, unconfined aquifer may be backfilled with drill cuttings or clean sand or gravel from the bottom of the hole to the top of the aquifer. Above the aquifer, bentonite grout or cement grout shall be used to plug the test hole from the top of the aquifer to within at least eight feet of the ground surface. The upper eight feet of the hole shall be plugged in accordance with the specifications set forth in § 74:11:08:04.
Source: 34 SDR 323, effective July 2, 2008.