Section R. 325.10819 - Well casing in rock formationRule 819.
(1) In an area where a well is to be developed in fractured, jointed, or cavernous rock, the well shall not be approved as a production well unless all of the following conditions exist:(a) Adequate protective material above the aquifer.(b) No evidence of aquifer contamination.(c) No direct flow from surface or near surface sources to the rock aquifer.(2) The department may also approve a well developed in fractured, jointed, or cavernous rock based on special well construction features and a hydrogeologic study.Mich. Admin. Code R. 325.10819