NR 812.13(7)(b)(b) Minimum diameter. The minimum diameter of an upper enlarged drillhole shall meet the following requirements:
NR 812.13(7)(b)1.1. Four inches greater than the nominal diameter of the casing or couplings.
NR 812.13(7)(b)2.2. A well driller or well constructor may reduce the diameter of an upper enlarged drillhole to 3 inches greater than the nominal diameter of the casing when flush-threaded thermoplastic casing is used and the required sealing material, according to sub. (8), is placed in the annular space using a pressure grouting method according to the requirements of s. NR 812.20.
NR 812.13(7)(b)3.3. A well driller or well constructor may reduce the upper enlarged drillhole to 2 inches greater than the nominal diameter of the casing when welded steel casing is used and the required sealing material, according to sub. (8), is placed in the annular space using a pressure grouting method according to the requirements of s. NR 812.20.
NR 812.13(7)(c)(c) Method of keeping hole open. A well driller or well constructor shall maintain an upper enlarged drillhole at full diameter during drilling by any of the following methods:
NR 812.13(7)(c)1.1. Keeping the drillhole filled up to within 10 feet of the ground surface with drilling mud.
NR 812.13(7)(c)2.2. Circulating bentonite drilling mud.
NR 812.13(7)(c)3.3. Setting a temporary outer casing.
NR 812.13(7)(d)(d) Grouting. A well driller or well constructor shall grout an upper enlarged drillhole according to the requirements specified in sub. (8).
NR 812.13(8)(8)Grouting material and methods.
NR 812.13(8)(a)(a) Grouting material shall meet the requirements of s. NR 812.11 (15) and shall be placed in an annular space in accordance with the requirements specified in s. NR 812.20. A flowing well shall be grouted using the materials specified in s. NR 812.15. A potable high capacity well shall be grouted using the materials specified in s. NR 812.152.
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)(b)2.2. Neat cement.
NR 812.13(8)(b)3.3. Sand-cement.
NR 812.13(8)(b)4.4. Sodium bentonite.
NR 812.13(8)(b)5.5. Sodium bentonite-sand.
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(8)(d)1.1. Sodium bentonite.
NR 812.13(8)(d)2.2. Sodium bentonite-sand.
NR 812.13(8)(d)3.3. Neat cement.
NR 812.13(8)(d)4.4. Sand-cement.
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 812.14Drilled 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.