(1) CONSTRUCTION. All water system related
buildings under s.
NR 811.24 shall meet all of the following requirements:
(a) Have adequate space for the installation
of additional pumping units, water treatment equipment, chemical feed
equipment, or controls, if needed, and for the safe servicing of all
equipment.
(b) Be durable, fire and
weather resistant, and constructed in a manner to maximize sanitary protection
of the water supply.
(c) Be secure.
Buildings shall have at least one outward opening door to the outside. All
doors, windows, and hatches shall have locks. Any security alarms installed
shall be connected to telemetry control and SCADA systems where such systems
are used.
(d) Be landscaped to
conduct surface drainage away from the station and have a floor elevation at
least 6 inches above the finished grade and at least 2 feet above the regional
flood elevation as determined in s.
NR 116.07 (4). Buildings shall be provided with year
round dry land access. Below grade installations may be permitted only if the
terrain at the site is such that a gravity drain system can be provided.
Subsurface pits or pumprooms and inaccessible installations intended to house
well heads, pumps, pump motors, or pump controls for pumping stations are
prohibited except for below grade booster pumping stations as allowed per s.
NR 811.80 (3) and
(4).
(e) Provide for all floors to drain so that
floor runoff does not enter the treatment process or source water. Floors shall
be sloped to a drain or sump.
(f)
Provide a suitable outlet for drainage water from pump glands so that the
disposal of any drainage water is piped to waste or otherwise disposed of in a
controlled manner. Pump gland drainage piping shall not be directly connected
to a hub drain or a floor drain.
(g) Be provided with concrete
floors.
(h) Be provided with at
least one floor drain meeting the following requirements:
1. Floor drains and hub drains shall be
properly separated from a well. A floor or hub drain and associated piping
accepting water from pump gland drainage, a pressure relief or control valve, a
sampling faucet, or the floor shall be located no closer than 2 feet to the
outer well casing. No building drain piping, except that piping leading to the
aforementioned floor or hub drains, containing blackwater or graywater, may be
located closer than 8 feet to the outer well casing.
2. Floor drains and hub drains shall have a
discharge location that complies with all of the following requirements:
a. Floor drains and hub drains may be
connected to a sanitary sewer where available if the building floor elevation
is at least one foot above the rim elevation of the nearest upstream sanitary
sewer manhole. If a sanitary sewer is available but a manhole is not located
nearby or the manhole does not comply with the upstream location or the one
foot requirement, the department may require installation of an additional
manhole on the sanitary sewer main or on the sanitary building sewer.
Note: The department recommends that the floor
drains from chemical feed rooms discharge to a sanitary sewer whenever
practicable.
b. Floor drains
and hub drains may discharge to the ground surface if the building drain and
building sewer piping will only carry water from the floor or hub drain, the
discharge location shall be at least 25 feet from the pumphouse, the exterior
invert of the building sewer pipe shall be at least 6 inches below the building
floor elevation and the exterior pipe opening shall be covered with a corrosion
resistant rodent screen. A greater distance may be required for drains of pump
stations serving wells constructed in sand and gravel formations. The piping
shall terminate in a location that will not allow backflow of surface water
into the building.
bm. A floor drain
or hub drain may be connected to a storm sewer where available if the building
drain and building sewer piping will only carry water from the floor or hub
drain and if the building floor elevation is at least one foot above the rim
elevation of the nearest upstream storm sewer manhole. If a storm sewer is
available but a manhole is not located nearby or the manhole does not comply
with the upstream location or the one-foot requirement, the department may
require installation of an additional manhole on the storm sewer main or on the
building sewer discharge line.
c.
Floor drains and hub drains may discharge to a buried tank located a minimum of
50 feet from the well if the discharge to the building drain and building sewer
piping will contain only water from pump gland drainage, a pressure relief or
control valve, a sampling faucet or floor drainage. These buried tanks may not
be installed unless approved by the department's bureau of watershed management
wastewater section prior to installation. Floor drains and hub drains may
discharge to a POWTS holding component located a minimum of 200 feet from the
well if the discharge will contain toilet, sink or other sanitary or domestic
waste. These POWTS holding components may not be installed unless approved by
the department of safety and professional services prior to installation. In
either case the rim elevation of the access manhole to the tank shall be at
least one foot below the building floor elevation and a high water alarm shall
be installed for the tank in accordance with the requirements of s.
SPS 383.43 (8) (e).
d. Soil infiltration components, including
french drains, are prohibited.
3. The drain may be a trench drain system if
the lowest elevation of any trench drain complies with subd. 2. a. Where trench
drains are to be connected to a sanitary sewer and compliance with subd. 2. a.
is not possible, a sump containing a sump pump shall be installed in the trench
to discharge the trench water with a minimum 2 pipe diameter free air break
over a hub drain. The top elevation of the hub drain shall be at least one foot
above the elevation of the nearest upstream sanitary sewer manhole rim. Where
trench drains will discharge to grade the exterior invert of the building sewer
pipe shall be at least 6 inches below the lowest elevation of the trench drain
and the exterior pipe opening shall be covered with a corrosion resistant
rodent screen.
4. Floor drains
shall be constructed of department of safety and professional services approved
plumbing materials. The building drain piping shall be constructed of cast iron
or PVC piping within 10 feet of the outer well casing.
(i) Pitless units shall be provided with a
locked and vented watertight enclosure fastened watertight to a concrete floor.
The enclosure shall be weather resistant, of sufficient size to accommodate all
well appurtenances and electrical or auxiliary power connections and be
accessible for year-round inspection, water sample collection, and water level
data collection. Any enclosure vents shall be shielded from the elements and
wind-blown debris and the vent openings shall be covered with 24-mesh corrosion
resistant screens. Backfill material for slab-on-grade enclosures shall be
compacted in lifts. Any slab-on-grade concrete floor shall have minimum
dimensions of 4 feet by 4 feet by 6 inches thick and be provided with
reinforcing.
(j) A small,
doghouse-type, enclosure may be installed over a well and abbreviated above
grade pump discharge piping where chemical addition equipment or
hydro-pneumatic pressure tank storage is located remote from the well. The
department may waive portions of the building installation requirements for
small enclosures. The enclosure shall be secured watertight to a concrete floor
and allow for convenient access to the well, piping and any appurtenances. The
enclosure shall be locked as applicable. If a floor drain will not be
installed, the floor shall be sloped to drain toward the access door if one is
provided.
(2) EQUIPMENT
SERVICING. Pumping stations shall be provided with all of the following:
(a) Crane-ways, hoist beams, eyebolts, or
other facilities necessary for servicing or removal of pumps, motors, or other
heavy equipment where appropriate.
(b) Openings in floors, roofs or wherever
needed for removal of heavy or bulky equipment. For well pumphouses, a secured
roof hatch shall be located over the well.
(3) STAIRWAYS AND LADDERS. Stairways or
ladders shall be provided between all floors and in pits or compartments which
are to be entered.
(4) HEATING.
Adequate heating shall be provided for the safe and efficient operation of the
equipment.
Note: In buildings not occupied by personnel,
only enough heat need be provided to prevent freezing, unless higher
temperatures are required for proper chemical addition or to allow water
treatment and control equipment to function properly.
(5) VENTILATION. Ventilation for all pumping
stations, pumphouses, and water treatment plant buildings is governed by
applicable building codes.
(6)
DEHUMIDIFICATION. A means for dehumidification shall be provided in pump rooms
and in other water system related buildings where excess moisture could cause
or is causing safety hazards or damage to equipment or piping.
(7) LIGHTING. All pumping stations,
pumphouses, and water treatment plant buildings shall be provided with adequate
interior and exterior lighting. The design of exterior lighting should promote
security.
(8) SANITARY AND OTHER
CONVENIENCES. All pumping stations, pumphouses, and water treatment plants
shall be provided with potable water, lavatory, and toilet facilities except
for unoccupied automatic stations or if such facilities are available
elsewhere. All plumbing including fixtures, backflow protection, floor drains,
hub drains, piping and their installation, testing, and maintenance shall
conform to the requirements of chs.
SPS 302,
305 and
381 to
384.
(9) MULTIPURPOSE BUILDINGS. Water supply
buildings may be enclosed in or attached to buildings that serve multiple
purposes such as a park building, garage, office, storage or restroom facility
if the purposes for which the building are used are compatible with the
protection of the water supply. In all cases the water supply facilities shall
be separated by walls from the other building uses with access to the water
supply facilities gained by separate locked doors and restricted to authorized
water system personnel. The specific requirements for multipurpose buildings
shall comply with subs. (1) to (8) where applicable.
