Section R. 560.408 - Well protectionRule 408. The owner shall be responsible for the construction of an on-site water supply that is free from sources of contamination. The following methods shall be given consideration:
(a) Penetration of an impervious layer which is of sufficient areal extent, but which is not less than 10 feet thick.(b) Maintaining a minimum of 50 feet from the static water level to the bottom of the casing or top of the screen in an unconfined aquifer.(c) An increase in the minimum horizontal isolation distance between the well and a source from which groundwater contamination may occur.(d) A combination of the methods in subdivisions (a), (b), and (c) of this subrule or another method that the department determines will provide adequate protection for the on-site water supply.Mich. Admin. Code R. 560.408