NR 812.20(3)(e)1.1. The well driller or well constructor shall place a measured volume of grout that is equal to the volume of the annular space plus at least 15% into the upper enlarged drillhole through a tremie pipe.

NR 812.20(3)(e)2.2. The well casing pipe shall be fitted with centering guides and a drillable plug at the bottom and shall be lowered through the grout to the bottom of the upper enlarged drillhole allowing the grout to be forced up into the annular space.

NR 812.20(3)(e)3.3. If necessary, pressure shall be applied and maintained on the top of the well casing pipe to hold it in place for at least 12 hours or until the grout sets, whichever is longer. Water may be added to the well casing pipe to provide extra weight.

NR 812.20(3)(e)4.4. If the grout does not flow at the ground surface, the remainder of the annular space shall be filled with grout placed through a tremie pipe that shall be at the drill site.

NR 812.20(4)(4) Non-pressure grouting. The tremie pipe-gravity method of non-pressure grouting may be used when the upper enlarged drillhole is less than 100 feet deep and is at least 4 inches larger in diameter than the nominal diameter of the well casing pipe. Grout material may flow by gravity through a funnel or hopper connected to a tremie pipe that extends to the bottom of the upper enlarged drillhole.

NR 812.21(1)(1) Liners installed to correct contamination. Any liner installed to address a water supply with contaminant levels in excess of the standards specified in s. NR 812.06 or to prevent cross-migration between aquifers shall be grouted in place using the procedures under sub. (5).

NR 812.21(2)(2) Pipe material. Pipe used to line a well shall meet the requirements specified in s. NR 812.11 (6) or (7). Ungrouted steel liner pipe may have a lesser wall thickness than is required in Table B for the diameter of well casing pipe but shall have a wall thickness of at least 0.216 inches.

NR 812.21(3)(3) Diameter of pipe. Liner pipe shall be the largest practical diameter allowing installation in the well. When a liner is grouted in place, it shall have a nominal diameter at least 2 inches smaller than the nominal diameter of the permanent well casing pipe or the diameter of the drillhole.

NR 812.21(4)(4) Liner installation. Liner pipe shall extend at least 10 feet above the static water level or packers shall be installed far enough above and below the caving zone to prevent further entrance of material into the well. When the liner pipe does not extend to the bottom of the well, the liner pipe shall be supported on the bottom and top with a pipe flange or packer installed between the outside of the liner and the inside of the drillhole.

NR 812.21(5)(b)(b) When the liner pipe does not extend to the bottom of the well, a flange or approved packer shall be provided at the bottom of the liner between the outside of the liner and the inside of the drillhole or the inside of the well casing pipe, or the liner shall rest on backfill material to be later drilled or bailed out.

NR 812.21(5)(d)(d) The liner pipe shall be completely sealed in place from the bottom of the liner to the top of the liner with neat cement grout using a pressure grouting method according to the grouting requirements specified in s. NR 812.20. The liner shall be supported until the grout has set.

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)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.