NR 812.42(2)(d)3.3. If the raised alcove floor results in the well casing pipe terminating less than 6 inches above the floor, then the well casing pipe shall be extended as specified in sub. (2) (d) 1. d. and in accordance with sub. (12).

NR 812.42(2)(e)(e) Pit venting. Well pit vent pipes, if used, shall be located in opposite corners. One pipe shall extend to within one foot of the pit floor and the other extend only down through the pit roof. The upper end of each vent pipe shall extend watertight through the pit roof and terminate with a reverse bend and screened outlet.

NR 812.42(3)(a)(a) Noncomplying pit structures. When a pit structure does not meet the minimum construction requirements of sub. (2) or when water gains access to a pit through the floor or walls, the floor and at least one wall of the pit shall be perforated and the pit shall be filled after properly extending the well casing pipe above grade in accordance with sub. (12) or after properly filling and sealing the existing well according to s. NR 812.26. Before the pit is filled, all water system components, including the pressure tank, pump, discharge piping, electrical wiring and conduit, and any treatment equipment shall be removed from the pit.

NR 812.42(3)(b)(b) Noncomplying alcoves. If the pit is an alcove, the alcove does not need to be filled, except when the alcove floor is lower than the basement floor, in which case the floor shall be raised to a height at least even with the basement floor by pouring concrete. To allow for easy removal of the pump for servicing or replacement, this casing extension may be made with the use of a threaded and coupled joint.

NR 812.42(3)(c)(c) Other modifications to pit or alcove. Any other modifications to a pit or alcove allowed under this chapter shall meet the requirements of s. NR 812.36.

NR 812.42(3m)(3m) Valve pits and alcoves. Existing pits and alcoves used only for the housing of valves are exempt from the requirements of this section except that a pit or alcove used for this purpose shall be watertight, may not be connected to a sewer, shall be drained to permeable soil or to the ground surface, and may not be subject to flooding.

NR 812.42(4)(a)(a) An existing reservoir shall be constructed of steel or reinforced concrete. If constructed with concrete, the roof shall be watertight, reinforced, poured concrete having a thickness of at least 5 inches. The walls and floor of the reservoir shall be watertight and constructed of reinforced, poured concrete or equivalent watertight construction.

NR 812.42(4)(b)(b) The manhole curbing shall extend at least 12 inches above the established ground grade. If the reservoir roof terminates above the established ground grade, the curbing shall terminate at least 6 inches above the reservoir roof. The manhole shall be provided with a waterproof, tight-fitting, overlapping metal cover with skirted sides.

NR 812.42(4)(c)(c) A reservoir overflow pipe shall be installed watertight just under the roof of the reservoir and entirely above the established ground grade. It shall terminate at a point at least 12 inches above the established ground grade with a screened, downturned elbow. If an existing overflow pipe is totally buried between the reservoir and its outlet, it shall be eliminated by properly sealing the pipe with concrete at the reservoir.

NR 812.42(4)(d)(d) A gravity discharge pipe to the reservoir shall extend entirely above established ground grade and through the roof of the reservoir or manhole curbing. Service pipe connections shall be sealed watertight. A pressurized service pipe may be connected to the reservoir below ground grade provided it is under a continuous pressure which is greater than the ground surface elevation.

NR 812.42(4)(e)(e) The reservoir shall meet the location requirements in effect at the time of its construction.

NR 812.42(4)(f)(f) When a below ground-grade reservoir or a buried pressure tank pit is to be abandoned, it shall be permanently filled and sealed when the well or drillhole is filled and sealed. The reservoir shall be filled according to the filling and sealing requirements specified in s. NR 812.26 (5) (m) for well pits.

NR 812.42(4)(g)(g) The owner shall permanently fill and seal a reservoir if any of the following apply:

NR 812.42(4)(h)(h) A reservoir shall be maintained in a clean and sanitary condition and provide water free from coliform bacteria and free from contaminant levels in excess of the standards specified in s. NR 812.06.

NR 812.42(5)(5) Dug wells. An existing dug well may be continued in service only if it produces water free from coliform bacteria and free from contaminant levels in excess of the standards specified in s. NR 812.06. Use of dug wells is not recommended by the department. A dug well may not be reconstructed without approval under s. NR 812.09 (4) (m). Existing dug wells shall meet the following minimum construction requirements:

NR 812.42(5)(a)(a) Curbing. The curbing of every dug well shall be of watertight reinforced poured concrete or at least 3/16 inch thick steel curbing with watertight joints. Fieldstone curbing may not be used. The curbing shall extend above grade at least 8 inches and be protected from flooding. An open annular space may not exist around the dug well curbing.

NR 812.42(5)(b)(b) Depth. If the well was dug after June, 1975, the watertight curbing shall extend to a depth of at least 25 feet below ground surface and the well shall produce water free from coliform bacteria. If the well was dug prior to June, 1975, the watertight curbing shall extend to at least the 15-foot depth and the well shall produce water free from coliform bacteria.

NR 812.42(5)(c)(c) Cover. The dug well cover shall be of watertight, reinforced concrete at least 5 inches thick and wide enough to overlap the curbing by at least 2 inches. It shall provide a tight seal and be free of joints. A steel well casing pipe sleeve meeting the requirement for potable well casing pipe specified in s. NR 812.11 (6) shall extend watertight through the cover to provide access for installing the pump. The steel well casing pipe sleeve shall extend at least 8 inches above the cover and have an approved well cap or a one-piece well seal.

NR 812.42(5)(d)(d) Equipment location. Pumping equipment or attachments may not be installed for a dug well so that access to the interior of the well will be required for maintenance or repair.

NR 812.42(6)(6) Pump and pump discharge installations. Pump installations installed prior to February 1, 1991 shall conform to the following requirements:

NR 812.42(6)(a)(a) Residential up to three families. Installations for water supplies serving a maximum total of 3 families in residential units shall meet the following requirements:

NR 812.42(6)(a)1.1. The subsurface connection to the well casing pipe may be made with an approved weld-on pitless adapter or with an approved pitless unit provided the adapter or unit is installed according to the requirements of s. NR 812.31.

NR 812.42(6)(a)2.a.a. Any buried suction pipe shall be contained in a sealed pressurized conduit or a nonpressurized conduit, if the nonpressurized conduit was installed before February 1, 1991 (Figures 12 and 13 of ch. NR 812 Appendix). The nonpressurized conduit shall meet the pipe requirements of Table B between the connection to the well casing pipe and a basement, or shall be properly connected to the well with an approved pitless adapter or pitless unit designed for and used with a concentric piping arrangement. Unprotected buried suction lines not enclosed in conduit may not be used.