Wisconsin Administrative Code › Department of Natural Resources › NR 800 - Environmental Protection - Water Supply › Chapter NR 812 - Well Construction And Pump Installation › Subchapter II - New Water Well and Heat Exchange Drillhole Construction and Reconstruction and Filling and Sealing of Wells and Drillholes › Section NR 812.22 - Well rehabilitation and batch chlorination

Current through June 24, 2024
(1) REHABILITATION.
				  All of the following requirements apply to the rehabilitation of a well by a
				  well driller or well constructor:
(a)
Redevelopment.
The methods described for development under s.
				  NR
				  812.12(15) may be used to redevelop a
				  well.
(b)
Chemical
				  conditioning.
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.
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.
(c)
Physical conditioning.
Wells may be physically conditioned using any of the following methods:
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.
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.
3.
				  `Mechanical brushing.' A well may be mechanically brushed to loosen material
				  attached to the inside of a casing, screen, or open drillhole.