Section R. 325.1639 - Construction of wells; well screens; lead packers, lead plugs, lead wool and certain drilling fluids prohibited; requirements for steel pipe used as screen riser pipes, blanks, or tailpipes; well pumping rate; temporary capping; well alignment; drilling water; requirements when using chlorine or other well rehabilitation chemicalsRule 139.
(1) A water supply well that is installed in unconsolidated sand and gravel aquifers shall ordinarily be fitted with a screen that has openings which are properly sized so that the aquifer can be properly developed to produce sand-free water at the pumping rate of the permanent pump. A well screen, where installed on a casing that is less than 4 inches inside diameter, shall be telescoped and removable, except for a driven well point that is installed pursuant to the provisions of R 325.1632a.(2) Lead packers, lead plugs, or lead wool shall not be used as a well component.(3) Drilling fluids or additives that contain guar gum or other biodegradable organic materials shall not be used during the drilling of a well.(4) Steel pipe that is used as well screen riser pipes, blanks, or tailpipes shall be in compliance with the minimum weight, dimension, and material standards for well casing that are listed in the provisions of R 325.1626 and R 325.1627.(5) A new, repaired, or reconditioned well shall be developed and pumped to waste at a pumping rate which equals or exceeds that of the permanent pump, until the water is as clear as is reasonably possible considering the groundwater conditions in the area. The permanent pump shall not be used to develop the well without the owner's consent.(6) Temporary capping of a well until the pumping equipment is installed shall be provided to prevent contaminants from entering the well.(7) A well shall be sufficiently straight and vertical to allow normal installation and operation of the pump.(8) Water that is used for drilling purposes, other than water from the well itself, shall be potable water that contains a free chlorine residual of not less than 10 parts per million at the time of use and shall be conveyed in containers that are clean and capable of being maintained in a clean condition. Surface water shall not be used for drilling purposes unless it is obtained from a municipal water supply system.(9) When chlorine is placed into a water supply system pursuant to the provisions of R 325.1661 or when well rehabilitation chemicals are used, the well drilling contractor or pump installer shall provide notification to the well owner or building occupants or shall make the system inoperable during the treatment period.Mich. Admin. Code R. 325.1639