S.D. Admin. R. 74:02:04:50
Well screens or casing may have openings which are sawed, drilled, punched, rolled, welded, stamped, or made by any means which will control the size of perforations or openings. Installed well casing may be shot-perforated. If gravel pack is used, the screen must be sized and designed to retain 90 percent of the gravel pack material. In naturally developed wells, the screen must be sized and designed to retain 50 percent of the aquifer material. The screen shall be centered in the drill hole. If used, the gravel pack material must be clean material without shale or iron pellets. The driller shall ensure that all well construction materials, including gravel pack, are clean and sanitary prior to placement. The gravel pack material shall be disinfected before being placed in the well or equivalent quantities of chlorine tablets shall be mixed with the gravel pack material and placed in the well. Screen diameters and openings shall be selected so as to accomplish the same purpose as required for wells developed in the natural aquifer materials. If additional filter pack materials are to be added after the well has been completed, those materials shall be installed through a permanent tremie pipe.
S.D. Admin. R. 74:02:04:50
General Authority: SDCL 46-2-5, 46-2-20, 46-6-27.
Law Implemented: SDCL 46-6-20, 46-6-27.