NR 812.15(3)(b)(b) Minimum diameter. The upper enlarged drillhole shall be a minimum of 4 inches larger than the nominal diameter of any casing to be grouted, except as allowed under par. (e). NR 812.15(3)(c)(c) Method of keeping the hole open. The upper enlarged drillhole shall be kept open during construction using any of the following methods: NR 812.15(3)(c)2.2. Circulating drilling mud with a weight of at least 9 pounds per gallon. Additives approved under s. NR 812.091 may be added to the drilling mud to increase the mud weight. NR 812.15(3)(e)(e) Double cased wells. When a well is double cased, it shall be constructed in accordance with all of the following requirements: NR 812.15(3)(e)1.1. The nominal casing diameter of the outer casing may be reduced to a minimum of 2 inches in diameter greater than the nominal diameter of the inner casing when welded steel or flush-threaded thermoplastic casing is used for an inner casing. NR 812.15(3)(e)2.2. An upper enlarged drillhole shall be constructed into the confining bed in accordance with par. (c). NR 812.15(3)(e)3.3. The outer casing shall be placed in the upper enlarged drillhole and grouted in place according to the requirements specified in sub. (2). The grout shall be allowed to set for a minimum of 24 hours before drilling continues. NR 812.15(3)(e)4.4. A second upper enlarged drillhole shall be constructed to at least the minimum casing depth for the formation encountered and in accordance with par. (c). NR 812.15(3)(e)5.5. The inner casing shall be placed in the upper enlarged drillhole and grouted in place according to the requirements specified in sub. (2). The grout shall be allowed to set for a minimum of 24 hours before drilling continues. NR 812.15(4)(4) Construction requirements in bedrock formations. In addition to the general requirements of this section and the requirements specified in ss. NR 812.10 to 812.14, a well driller or well constructor shall construct or reconstruct a flowing well in bedrock formations according to all of the following requirements: NR 812.15(4)(a)1.1. An upper enlarged drillhole shall be constructed to the minimum casing depth for the bedrock formation encountered or halfway through any known confining bed, whichever is deeper, except when the well is double cased in accordance with par. (e). NR 812.15(4)(a)2.2. When the depth to the top of bedrock is more than the minimum casing depth for the bedrock formation encountered, the upper enlarged drillhole depth may be reduced to 25 feet below ground surface when steel casing is driven or advanced according to the requirements of sub. (2) (b). NR 812.15(4)(b)(b) Minimum diameter. The upper enlarged drillhole shall be a minimum of 4 inches larger than the nominal diameter of any casing to be grouted, except when the well is double cased in accordance with par. (e). NR 812.15(4)(c)(c) Method of keeping the hole open. The upper enlarged drillhole shall be kept open during construction using any of the following methods: NR 812.15(4)(c)1.1. Driving temporary casing to the depth of casing setting or to the top of bedrock. NR 812.15(4)(c)2.2. Circulating drilling mud with a weight of at least 9 pounds per gallon. Approved additives may be added to the drilling mud to increase the mud weight. NR 812.15(4)(d)(d) Seating casing. Any casing set into an upper enlarged drillhole constructed more than 5 feet into bedrock shall be driven to a firm seat prior to grouting the annular space. NR 812.15(4)(e)(e) Double cased wells. When a well is double cased in bedrock, it shall be constructed in accordance with all of the following requirements: NR 812.15(4)(e)1.1. The outer casing may be reduced to a minimum of 2 inches in diameter greater than the nominal diameter of the inner casing when welded steel casing is used as an inner casing. The minimum diameter of an inner casing is 6 inches. NR 812.15(4)(e)2.2. An upper enlarged drillhole shall be constructed into the confining bed in accordance with par. (c). NR 812.15(4)(e)3.3. The outer casing shall be placed in the upper enlarged drillhole and grouted in place according to the requirements specified in sub. (2). The grout shall be allowed to set for a minimum of 24 hours before drilling continues. NR 812.15(4)(e)4.4. A second upper enlarged drillhole shall be constructed to at least the minimum casing depth for the formation encountered and in accordance with par. (c). NR 812.15(4)(e)5.5. The inner casing shall be placed in the upper enlarged drillhole and grouted in place according to the requirements specified in sub. (2). The grout shall be allowed to set for a minimum of 24 hours before drilling continues. NR 812.15 HistoryHistory: CR 18-095: r. and recr. Register June 2020 No. 774, eff. 7-1-20; correction in (4) (intro.) made under s. 35.17, Stats., Register June 2020 No. 774; CR 21-070: am. (2) (c) Register July 2022 No. 799, eff. 8-1-22. NR 812.151NR 812.151 Heat exchange drillhole location and construction requirements. A heat exchange driller is responsible for constructing all heat exchange drillholes in accordance with the requirements specified in ss. NR 812.10 to 812.12 and all of the following requirements: NR 812.151(1)(1) License requirement. An individual who performs heat exchange drilling is required to be a licensed heat exchange driller except that a license is not required to perform heat exchange drilling if an individual is employed by a licensed heat exchange driller or a person registered as a business to perform heat exchange drilling and all other requirements under this section and ss. NR 812.10 to 812.12 are met. NR 812.151(2)(2) Approvals. A heat exchange driller shall obtain any approvals required in compliance with s. NR 812.09 (4) (w), (x), (y), or (z) prior to starting drilling and shall follow any conditions required by an approval. NR 812.151(3)(3) Notification of drilling. A heat exchange driller shall obtain a well notification permit from the department at least 24 hours prior to the start of drilling. NR 812.151(4)(a)(a) A heat exchange driller shall ensure that heat exchange drillholes are separated from potential contamination sources. A distance of 10 feet shall be maintained between a heat exchange drillhole and any of the following: NR 812.151(4)(b)(b) Prior department approval is required for any heat exchange drillhole located within 400 feet of a municipal water supply well. NR 812.151(5)(5) Temporary casing. A heat exchange driller may use any of the following materials for temporary casing for heat exchange drillholes: NR 812.151(6)(6) Pressure testing. Vertical heat exchange loop piping shall be pressure tested with potable water or an approved fluid in the loop, according to manufacturer’s specifications. NR 812.151(7)(7) Drilling fluids. Drilling fluid shall be less dense than the grout to facilitate proper sealing of heat exchange drillholes. NR 812.151(8)(8) Surface protection. A heat exchange driller shall protect heat exchange drillholes to prevent surface contamination from entering the drillhole during the drilling operation and when the driller is not at the drilling site. Drillholes may not remain open and ungrouted for more than 24 hours after completion. NR 812.151(9)(9) Grouting. All materials used to grout a heat exchange drillhole shall be approved for use under s. NR 812.091 and shall meet the requirements specified in s. NR 812.11. A heat exchange driller shall use one of the following materials to grout heat exchange drillholes: NR 812.151(9)(a)(a) Neat cement, if potable water or an approved fluid is continuously circulated in the loop pipe to prevent potential loop pipe deformation. NR 812.151(10)(10) Grouting method. A heat exchange driller shall use the following method to grout heat exchange drillholes: NR 812.151(10)(b)(b) For drillholes 25 feet in depth or more, grout shall be pumped through a tremie pipe under pressure according to the following requirements: NR 812.151(10)(b)1.1. The pipe shall be placed to the bottom of the drillhole and the grout shall be placed from the bottom up. NR 812.151(10)(b)2.2. The tremie pipe shall be kept submerged in the grout at all times during grouting. NR 812.151(10)(b)3.3. The tremie pipe may be pulled back during grouting as long as the end of the tremie pipe remains submerged in the grout. NR 812.151(11)(11) Fusion welding. Fusion welding connection for vertical heat exchange piping shall be done using socket fusion, saddle fusion or butt fusion type, in accordance with pipe manufacturer’s instructions or as referenced in ASTM D 2610, D 2683 and D 2657. Joint surfaces shall be clean and moisture free. NR 812.151(12)(12) Reporting. A heat exchange driller shall submit a report of the heat exchange drillhole project, on a form prescribed by the department, within 30 days following the date of completion of the project. NR 812.151(13)(13) Heat exchange fluids. Only department approved heat exchange fluids may be used in the piping placed in heat exchange drillholes. NR 812.151(14)(14) Filling and sealing. Unused heat exchange loops and drillholes shall be filled and sealed using the materials and methods specified in s. NR 812.26. NR 812.151 HistoryHistory: CR 18-095: r. and recr. Register June 2020 No. 774, eff. 7-1-20. NR 812.152NR 812.152 Construction requirements for potable high capacity wells, potable school wells, and wastewater treatment plant wells. Potable high capacity wells, potable school wells, and wastewater treatment plant wells shall be planned and constructed according to the location, approval, and general requirements speecified in ss. NR 812.08 to NR 812.12, and according to all of the following requirements: NR 812.152(1)(1) Minimum diameter. The minimum casing and lower drillhole diameter for potable high capacity wells, potable school wells and wastewater treatment plant shall meet the following requirements: NR 812.152(1)(a)(a) Four inches for wells completed in unconsolidated formations. NR 812.152(3)(3) Upper enlarged drillhole. An upper enlarged drillhole is required for all wells. An upper enlarged drillhole shall be constructed according to the following requirements: NR 812.152(3)(a)(a) An upper enlarged drillhole shall be a minimum of 3 inches larger than the outside diameter of welded casing pipe, or 3 inches larger than the diameter of the casing couplings, when couplings are used. NR 812.152(3)(b)(b) The upper enlarged drillhole shall be constructed to at least the minimum casing depth requirements specified in sub. (4). NR 812.152(3)(c)(c) The upper enlarged drillhole shall be maintained at full diameter for the entire depth by any of the following methods: NR 812.152(3)(c)2.2. Setting a temporary casing to the bottom of the drillhole, or to the top of bedrock. NR 812.152(4)(4) Casing depth. Minimum casing depths are measured from the ground surface. All wells shall be constructed with casing that extends to the minimum depth for the geologic formation they are completed in according to the all of the following requirements: NR 812.152(4)(a)1.1. Sixty feet or 20 feet below the static water level when the static water level is greater than 40 feet. NR 812.152(4)(a)2.2. One hundred feet, or 20 feet below the static water level when the static water level is greater than 80 feet, when the well is to supply water for a wastewater treatment plant and there is a treatment pond or lagoon or sludge beds on the property. NR 812.152(4)(b)1.1. Sixty feet or to the depth of bedrock when the top of bedrock is more than 60 feet below ground surface. NR 812.152(4)(b)2.2. One hundred feet when the well is to supply water for a wastewater treatment plant and there is a treatment pond or lagoon or sludge beds on the property. NR 812.152(5)(5) Grouting. The grouting of an annular space shall be accomplished according to all of the following requirements: NR 812.152(5)(b)(b) Grout shall be placed using an approved pressure grouting method as specified in s. NR 812.20 (3), except that the grout shall be allowed to set for a minimum of 24 hours before drilling is resumed. NR 812.152(5)(c)(c) Any temporary casing used during the construction of the upper enlarged drillhole shall be removed. NR 812.152(6)(6) Driving or advancing casing. Casing may be placed to the bottom of an upper enlarged drillhole meeting the requirements specified in sub. (3) and driven or advanced through unconsolidated material to the final casing depth or to the top of bedrock. NR 812.152(7)(7) Screens. Screens shall meet all of the following requirements: NR 812.152(7)(a)(a) Screens shall be continuous-slot screen, v-shaped or wire-wrap on a rod base type and composed of stainless steel or lead-free brass. NR 812.152(7)(b)(b) Screens may be permanently attached to the casing or riser pipe, or the screen may be placed using the bail-down method or by pushing the screen to the bottom of the casing and pulling it back to expose the screen. NR 812.152(8)(8) Gravel packs. Gravel packs shall be placed according to the requirements specified in s. NR 812.16. NR 812.152(9)(9) Geologic samples. Geologic samples shall be collected and submitted according to the requirements specified in s. NR 812.12 (11) (b) from all of the following:
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