South Dakota Administrative Rules
Title 74 - Department of Environment And Natural Resources
Article 74:02 - Water rights
Chapter 74:02:04 - Well construction standards
Section 74:02:04:46 - Precast curbing and concrete casing use limitations

(1) The top of the precast curbing or concrete casing shall be covered with a cover with a downward flange which will overlap the edge of the curbing or casing;

(2) The casing must be located deep enough into the saturated aquifer material to allow placement of the pump to meet the definition for adequate wells in subdivision 74:02:04:20(6);

(3) Pressure grouting as required by § 74:02:04:28 must be completed or, as an alternative, the precast curbing or concrete casing may be terminated 10 feet below the ground surface and the terminated casing covered with a concrete or steel cover. A concrete cover must have a hole in the center formed by a short section of pipe 10 inches in diameter or less. The pipe section must be an integral part of the cover and in place when the concrete cover is poured. A steel cover must have a hole in the center with a pipe 10 inches in diameter or less welded over the opening. The cover shall be placed on the terminated casing and the annular space outside the casing below the cover and the cover joint shall be sealed to a depth of no more than 2 feet above the top of the aquifer or to a depth of 20 feet below grade, whichever is nearest to ground surface, by pouring dry granular bentonite into the annular space through a tremie pipe. The space around the pipe extension to the surface shall be filled with bentonite to at least one foot above the cover and with clay or native soil to the ground surface. The pipe extension to the surface and any joints in the pipe must be watertight.

See Appendix G at the end of this chapter.