NR 812.13(8)(b)(b) For a potable low capacity or nonpotable high capacity well with steel casing, a well driller or well constructor shall use one of the following materials: NR 812.13(8)(b)1.1. Clay slurry or bentonite drilling mud and cuttings when the upper enlarged drillhole is less than or equal to 20 feet in depth. NR 812.13(8)(d)(d) For a potable low capacity or nonpotable high capacity well with thermoplastic casing, a well driller or well constructor shall use one of the following materials: NR 812.13(9)(9) Dual aquifer prohibition. A well driller or well constructor may not construct a well that is open to both an unconsolidated formation and a bedrock formation. NR 812.13 HistoryHistory: CR 18-095: r. and recr. Register June 2020 No. 774, eff. 7-1-20; correction in (1), (4) (intro.), (8) (b) (intro.), (d) (intro.) made under s. 35.17, Stats., and cr. (7) (a) (title), (b) (title) under s. 13.92 (4) (b) 2., Stats., Register June 2020 No. 774; CR 21-070: am. (3) (c), (4) (b), (8) (a), cr. (8) (d) 3., 4. Register July 2022 No. 799, eff. 8-1-22. NR 812.14NR 812.14 Drilled wells in bedrock formations. A well driller or well constructor shall construct wells terminating in bedrock formations according to the requirements of s. NR 812.12 and the construction of wells in bedrock shall be completed to meet all of the following requirements: NR 812.14(1)(1) Minimum diameter. The minimum diameter for bedrock wells is 6 inches. NR 812.14(2)(2) Casing depth. Minimum casing depth shall be measured from the ground surface. The following requirements apply to the minimum casing depth in bedrock formations: NR 812.14(2)(a)(a) Sandstone. Wells completed in sandstone bedrock shall have a minimum of 30 feet of casing. NR 812.14(2)(b)(b) Crystalline bedrock. Wells completed in crystalline igneous or metamorphic bedrock shall have a minimum of 40 feet of casing. NR 812.14(2)(c)(c) Limestone or dolomite. Wells completed in limestone or dolomite bedrock shall have a minimum casing depth as follows: NR 812.14(2)(c)1.1. Forty feet when the depth to the top of limestone or dolomite is equal to or greater than 20 feet below the ground surface. NR 812.14(2)(c)2.2. Sixty feet when the depth to the top of limestone or dolomite is less than 20 feet below the ground surface. NR 812.14(3)(a)(a) Material. Either steel or thermoplastic well casing pipe meeting the requirements of s. NR 812.11 (6) or (7) may be used as permanent casing for bedrock wells. NR 812.14(3)(b)(b) Centering. When well casing is set within an upper enlarged drillhole, it shall be centered within the drillhole to ensure an even annular space around the casing. When casing is placed in an upper enlarged drillhole that extends more than 80 feet below ground surface, a drive shoe or casing shoe shall be welded to the bottom of the casing and the casing shall be driven to a firm seat. The department may require, as a condition of an approval or in a special well casing area, that the well casing pipe be centered in the drillhole using any of the following methods: NR 812.14(3)(b)1.1. A set of at least 3 centering guides provided at every pipe joint within the bedrock to ensure an even annular space around the well casing pipe. A minimum of 2 sets of 3 centering guides shall be provided, one near the top of the bedrock and one at the bottom of the string of well casing pipe. NR 812.14(3)(b)2.2. A drive shoe or casing shoe welded or threaded onto the bottom of the string of well casing pipe and, if the well casing pipe extends more than 63 feet into the bedrock, at least one set of 3 centering guides provided on the casing pipe within the bedrock. If only one set of guides is provided, it shall be installed within 5 feet of the top of the bedrock. NR 812.14(3)(c)(c) Hung casing pipe prohibition. Casing shall be set to the bottom of an upper enlarged drillhole unless the casing is installed in compliance with the requirements of par. (d). NR 812.14(3)(d)(d) Screens. Screens may be installed in loosely cemented sandstone wells. The requirements for screen materials and installation of the screen specified in s. NR 812.13 (4) and the requirements for gravel packs specified in s. NR 812.16 apply to drilled wells in bedrock formations. NR 812.14(3)(e)(e) Thermoplastic casing use restricted. Thermoplastic casing may only be placed in an upper enlarged drillhole and may not terminate in crystalline bedrock or be driven or jetted into place.