DUG WATER-SUPPLY WELLS

Subpart 1. Construction. A dug well must be constructed to comply with all requirements of this chapter including the materials, grouting, and casing standards. Where geological conditions preclude the possibility of completing a water-supply well with conventional drilling methods, materials, or casing, a variance may be granted under part 4725.0410 to install a dug well for a residential water supply using unconventional techniques or materials. A dug water-supply well may only be constructed in an unconsolidated formation. Subp. 2. Cover. A dug water-supply well must be protected with a cap or cover meeting the requirements of part 4725.3150 , subpart 1, or a precast, overlapping, steel-reinforced, concrete cover at least four inches in thickness, or a locked, overlapping, metal cover at least 3/16 inch in thickness. The junction of cover with the well casing must be made with a watertight gasket and must be provided with a well vent according to part 4725.5450 . Subp. 3. Watertight openings. A pump opening and a connection below the established ground surface for a dug water-supply well must be made watertight according to part 4725.4850 , subpart 1, or with concrete or cement. Subp. 4. Location. Unless a dug water-supply well is grouted from the surface to a depth of 50 feet or through a confining layer, the well must be located according to part 4725.4450 , subpart 2.