NR 812.21 HistoryHistory: CR 18-095: r. and recr. Register June 2020 No. 774, eff. 7-1-20. NR 812.22NR 812.22 Well rehabilitation and batch chlorination. NR 812.22(1)(1) Rehabilitation. All of the following requirements apply to the rehabilitation of a well by a well driller or well constructor: NR 812.22(1)(b)1.1. Noncontinuous chemical treatment of a well, except for batch chlorination, shall be conducted under the supervision of a licensed water well driller or a Wisconsin registered professional engineer. Acidation of a well shall be done with materials approved for use under s. NR 812.091 and in a manner to prevent damage to the well or pump and to prevent any hazard to humans or property. The acid shall be inhibited and shall be neutralized upon removal from the well. NR 812.22(1)(b)2.2. Noncontinuous chemical treatment of pumps or pump intake screens shall be conducted under the supervision of a licensed pump installer or a Wisconsin registered professional engineer. Acidation of a pump or pump intake screen shall be done in a manner described under subd. 1. NR 812.22(1)(c)(c) Physical conditioning. Wells may be physically conditioned using any of the following methods: NR 812.22(1)(c)1.1. ‘Blasting.’ When using explosives to increase or recover the yield of a well, the explosive charge shall be set at least 10 feet below the bottom of the well casing pipe, which shall be filled with water or sand. A licensed water well driller shall supervise blasting work, which shall be performed by a blaster certified by the department of safety and professional services according to the requirements specified in ch. SPS 307. The well driller shall submit a report of results of the blasting within 30 days following the work on a well construction report form. NR 812.22(1)(c)2.2. ‘Hydrofracturing or hydroflushing.’ Hydrofracturing or hydroflushing of an aquifer by injecting potable chlorinated water into a crystalline bedrock formation well under high pressure is allowed. Clean washed inert, nontoxic material such as sand may be added to the water for the purpose of holding the joints and fractures open after the pressure is reduced. Hydrofracturing or hydroflushing may only be performed under the supervision of a licensed water well driller. The upper packer may not extend up into the bottom of the well casing pipe nor higher than 40 feet below the ground surface. Hydrofracturing or hydroflushing in limestone or dolomite formations may be undertaken only after prior department notification. The well driller shall submit a report of the results of the hydrofracturing or hydroflushing no later than 30 days after completion of the work on a form specified by the department. NR 812.22(1)(c)3.3. ‘Mechanical brushing.’ A well may be mechanically brushed to loosen material attached to the inside of a casing, screen, or open drillhole. NR 812.22(2)(2) Batch chlorination. All of the following requirements apply to the batch chlorination of a water system by a well driller or well constructor: NR 812.22(2)(a)(a) The entire water system shall be thoroughly disinfected with a chlorine solution having a concentration of at least 100 mg/L, prepared according to Table D. NR 812.22(2)(b)(b) The volume of chlorine solution shall be equal to or greater than the volume of water standing in the well. NR 812.22(2)(c)(c) The chlorine solution shall be brought into contact with the entire inside of the well casing pipe by continuous circulation from the water system. NR 812.22(2)(d)(d) A contact time of at least 12 hours shall be provided for the disinfectant. NR 812.22 HistoryHistory: CR 18-095: r. and recr. Register June 2020 No. 774, eff. 7-1-20. NR 812.23NR 812.23 Driven point wells. Driven point wells are typically constructed in sandy soil areas with a high water table and groundwater in these areas is very susceptible to contamination. If a driven point well is constructed, the well driller or well constructor shall ensure that all of the following requirements are met: NR 812.23(1)(1) Location. A driven point well shall be constructed to meet the location requirements and minimum separation distances specified in s. NR 812.08, and may not be constructed in a floodway. NR 812.23(2)(2) Material. Well casing pipe and screens used for driven point wells shall meet the requirements specified in s. NR 812.11 (6) and (11). NR 812.23(4)(4) Minimum diameter. The minimum diameter of a driven point well is 1-1/4 inches. NR 812.23(5)(5) Depth of casing. The well drive pipe, not including the screen, of a driven point well shall extend to a depth of 25 feet or to a depth 10 feet below the static water level in the well, whichever is greater. NR 812.23(6)(6) Frost protection. Driven point wells, when protected against freezing, may be installed with a protective outer sleeve below frost depth. When installed in this manner, the top of the annular space between the well and the protective sleeve shall be sealed watertight with a sanitary well seal. NR 812.23(7)(7) Pump installation. Pump installations for driven point wells shall be completed according to s. NR 812.32. NR 812.23(8)(8) Screen replacement. Screen replacement is considered new well construction and shall meet all the requirements of this chapter. Screens may not be replaced on driven point wells that do not comply with the location requirements of this chapter. NR 812.23(10)(10) Starter drillholes. Starter drillholes not exceeding 10 feet deep may be constructed to facilitate driving the pipe. If a starter drillhole is constructed, the annular space shall be sealed using the materials and methods specified in s. NR 812.13 (8) following completion. The temporary outer casing shall be removed if possible. NR 812.23(11)(11) Flowing wells. The construction of a flowing driven point well shall meet the requirements specified in s. NR 812.15 (1).