NR 812.42(2)(a)(a) Construction. The entire pit or alcove, including the roof, shall be constructed of reinforced watertight poured concrete. If the pit or alcove has a history of being continuously dry, walls of concrete block, brick, or stone with mortared joints are allowed. The walls, floor and roof shall be crack-free and watertight. The junction of walls and floors and all openings in the structure shall be sealed watertight. The roof or deck shall be at or above the ground surface. Requirements for existing pits are shown in Figure 10 of ch. NR 812 Appendix. Requirements for existing alcoves are shown in Figure 11 of ch. NR 812 Appendix.

NR 812.42(2)(b)(b) Access. The pit or alcove shall be provided with a manhole opening, having a raised curbing edge at least 4 inches higher than the pit or alcove roof. A structurally substantial, waterproof, overlapping, tight-fitting cover with skirted sides shall be provided for the manhole. A watertight, cast-iron manhole frame and cover bolted in place with a gasket may be substituted for a curbed manhole. An alcove adjoining a basement or a pit not having the manhole centered over the well may have a section of well casing pipe installed directly above the well. This pipe shall be equal in size or larger than the well casing pipe and it shall be sealed with an approved well seal or cap.

NR 812.42(2)(c)(c) Drainage. An alcove adjoining a basement where the basement is subject to flooding shall be discontinued for use as a well pit and the well shall be filled and sealed according to s. NR 812.26. The alcove need not be filled and sealed. A pit or alcove drain or sump pump discharge pipe may not be directly connected to a sewer or other plumbing system. If the alcove drain discharge pipe is discharging to the ground surface, the end of the discharge pipe shall be screened.

NR 812.42(2)(d)(d) Casing height. The well casing pipe shall terminate at least 6 inches above the floor of a pit or alcove and shall be provided with a one-piece sanitary well seal approved for use under s. NR 812.091.

NR 812.42(2)(d)1.1. If the well casing pipe does not extend at least 6 inches above the floor, the pit or alcove may remain in service only if all of the following apply:

NR 812.42(2)(d)1.b.b. The well construction meets the minimum standards of sub. (1) (b), verified by measuring the well casing pipe depth in accordance with sub. (7) (c) 3., if no confirmable well construction report can be found for the well. Well details, including location, well casing pipe depth, total well depth, distances to possible contaminant sources and well owner information shall be entered on a form and submitted to the department in accordance with s. NR 812.10 (15).

NR 812.42(2)(d)1.d.d. The well casing pipe is extended up and out of the pit or alcove to 12 inches above the outside grade in accordance with sub. (12). For situations where the well would create an obstruction, including in a stoop, sidewalk, breezeway, driveway, garage or patio, making it impractical to raise the well casing pipe up and out of the alcove, the well casing pipe may be raised to a height just below the ceiling of the alcove structure in accordance with sub. (12).

NR 812.42(2)(d)2.2. If the floor of an alcove is lower than the basement floor, the alcove floor shall be raised to a height at least even with the basement floor by pouring concrete.

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.