74:02:04:53.01Bentonite grout
Section · Administrative Rules of South Dakota · View on sdlegislature.gov ↗
requirements. Bentonite material manufactured for use as a drilling fluid does not meet the requirements for bentonite grout. For approval by the chief engineer, bentonite grout must contain a minimum of 20 percent solids by weight and have a minimum slurry density of 9.4 pounds per gallon and must be mixed according to the manufacturer's recommendations.
Source: 18 SDR 224, effective July 16, 1992.