Wisconsin Administrative Code › Department of Natural Resources › NR 800 - Environmental Protection - Water Supply › Chapter NR 811 - Requirements For The Operation And Design Of Community Water Systems › Subchapter X - Distribution Systems › Section NR 811.73 - Installation of mains

Current through June 24, 2024
(1) GENERAL REQUIREMENTS. Installation of
				  mains shall be in accordance with AWWA standards in effect at the time of
				  design, manufacturer's recommended installation procedures, and the
				  requirements of this section.
Note:
A copy of the AWWA standards is
					 available for inspection at the central office of the department of natural
					 resources and may be obtained for personal use from the American Water Works
					 Association, 6666 West Quincy Avenue, Denver, Colorado 80235.
(2) INSTALLATION SPECIFICATIONS. The
				  specifications for installation of mains shall include provisions for all of
				  the following:
(a)
Bedding.
Continuous and uniform bedding shall be provided in the trench for all buried
				  pipe. Backfill material shall be tamped in layers around the pipe and to a
				  sufficient height above the pipe to adequately support and protect the pipe.
				  Grossly contaminated soil shall be removed, properly disposed of according to
				  chs.
				  NR
				  500 to
				  520 requirements, and replaced with
				  clean material. Clean clay cut-off walls shall be installed to minimize the
				  movement of contaminants along the trench if required by the
				  department.
(b)
Stone
				  removal.
Stones found in the trench shall be removed for a depth of at
				  least 6 inches below the bottom of the pipe.
(c)
Testing.
Pressure
				  testing of the installed pipe, including measurement of leakage and testing for
				  electrical conductivity shall be conducted, if appropriate. Pressure and
				  leakage testing shall be in accordance with AWWA Standard C600 in effect at the
				  time of testing.
(d)
Disinfection and sampling.
All new, cleaned or repaired water
				  mains shall be disinfected and sampled in accordance with the following
				  requirements:
1. 'Disinfection required.'
				  Water mains shall be disinfected before being put into service or before being
				  returned to service following maintenance or repair work. Detailed procedures
				  for disinfection, equivalent to those outlined in AWWA Standard C651 in effect
				  at the time of disinfection, shall be written into the specifications by the
				  design engineer.
2.
				  'Bacteriological sampling.' Disinfection and bacteriological sampling
				  requirements shall meet the requirements of s.
				  NR 810.09
				  (4). The design engineer shall include
				  detailed procedures for bacteriological sampling in the
				  specifications.
3. 'Allowable
				  chlorine in wasted water.' Consideration shall be given to the amount of
				  chlorine in any water wasted from a water main to the environment to prevent
				  harmful impacts. Dechlorination prior to discharge may be necessary in some
				  cases to prevent harmful impacts. Water wasted to surface water may not contain
				  any substances in concentrations that adversely affect the water as determined
				  under chs.
				  NR
				  105 and
				  106. For chlorine, no total residual
				  chlorine may be measured in water being discharged to surface water.
Note:
A copy of the AWWA standards is
					 available for inspection at the central office of the department of natural
					 resources and may be obtained for personal use from the American Water Works
					 Association, 6666 West Quincy Avenue, Denver, Colorado 80235.
(e)
Cover.
Sufficient earth or other suitable cover shall be provided over mains to
				  prevent freezing. A minimum cover of 5 feet is required unless determined by
				  the department to be unnecessary in specific cases. Insulation may be required
				  at some installations to prevent freezing.
Note:
The department recommends a minimum
					 depth of cover of 6.5 feet. To assure water mains are installed to prevent
					 freezing, consideration should be given to site specific conditions, such as
					 water demand in the area, frost and groundwater depth, and water mains
					 constructed under streets, highways, or other non-soil
					 surfaces.
(f)
Thrust
				  restraint
. All tees, bends, plugs and hydrants shall be provided with
				  thrust blocking, tie rods, or a joint restraint system designed to prevent
				  movement.
(g)
Locating
				  wire.
All underground components of public water mains, including
				  mains, hydrant leads, and water services to be constructed of nonconductive
				  material, shall be provided with a locating wire or other department approved
				  equally effective means that can be used to locate the components.
(h)
Erosion control.
Construction site erosion control shall be provided in accordance with s.
				  NR 811.09
				  (2).