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 › Section NR 811.02 - Definitions

Current through June 24, 2024
In this chapter:
(1g) "Air gap" means the unobstructed
				vertical distance through the free atmosphere between the lowest opening from
				any pipe or faucet supplying water to a tank or plumbing fixture and the flood
				level rim or spill level of the receptacle.
(1r) "ANSI" means the American National
				Standards Institute.
Note:
The ANSI address is 25 West 43 rd St, New
				  York, NY 10036.
(2) "API"
				means the American Petroleum Institute.
Note:
The API address is 1220 L Street NW,
				  Washington DC 20005-4070.
(3) "Approval" means the written approval of
				the department for any project requiring approval pursuant to s.
				281.41, Stats., and s.
				NR
				108.03 for community systems.
(4) "Aquifer storage recovery" or "ASR" means
				placement of treated drinking water underground through a well for the purpose
				of storing and later recovering the water through the same well for potable
				use.
Note:
Underground placement of water for the
				  purpose of restoring an aquifer is not included in the definition of "aquifer
				  storage recovery" or "ASR."
(5) "ASR system" means all of the ASR wells,
				ASR monitoring wells and related appurtenances within a municipal water system
				and any interconnected public water system served by the municipal water
				system.
(6) "ASTM" or "ASTM
				International" means the organization formerly knows as the American Society
				for Testing and Material.
Note:
The ASTM or ASTM International address is
				  100 Barr Harbor Drive, PO Box C700, West Conshohocken, Pennsylvania
				  19148-2959.
(7) "AWWA" means
				the American Water Works Association.
Note:
The AWWA address is 6666 West Quincy
				  Avenue, Denver, Colorado 80235.
(8) "Blackwater" means wastewater
				contaminated by human body waste, toilet paper and any other material intended
				to be deposited in a receptor designed to receive urine or feces.
(9) "Building" means a structure for support,
				shelter, or enclosure of persons or property.
(10) "Building drain" means horizontal piping
				within or under a building, installed below the lowest fixture or the lowest
				floor level from which fixtures can drain by gravity to the building
				sewer.
(11) "Building drain, storm"
				means a building drain which conveys storm water, clear water, or
				both.
(12) "Building sewer" means
				that part of the drain system not within or under a building which conveys its
				discharge to a public sewer, private interceptor main sewer, private onsite
				wastewater treatment system or other point of discharge or dispersal.
(13) "Building sewer, sanitary" means a
				building sewer which conveys wastewater consisting in part of domestic
				wastewater.
(14) "Building sewer,
				storm" means a building sewer which conveys storm water, clear water, or
				both.
(15) "Chlorine Institute"
				means the Chlorine Institute, Inc.
(16) "Community water system" means a public
				water system which serves at least 15 service connections used by year-round
				residents or regularly serves at least 25 year-round residents. Any water
				system serving 7 or more single family homes, 10 or more mobile homes, 10 or
				more apartment units, 10 or more duplex living units or 10 or more condominium
				units shall be considered a community water system unless information is
				provided by the owner indicating that 25 year-round residents will not be
				served.
(17) "Cross connection"
				means a connection or potential connection between any part of a water supply
				system and another environment containing substances in a manner that, under
				any circumstances, would allow the substances to enter the water supply system
				by means of back siphonage or back pressure.
(18) "CT" or "CT calc" is the product of the
				"residual disinfectant concentration" (C) in mg/l determined before or at the
				first customer, and the corresponding "disinfectant contact time" (T) in
				minutes, i.e., "C" x "T". If a public water system applies disinfectants at
				more than one point prior to the first customer, the public water system owner
				or operator shall determine the CT of each disinfectant sequence before or at
				the first customer, to determine the total percent inactivation or "total
				inactivation ratio." The inactivation ratio for a single disinfectant sequence
				is:
See
				  Image
where "CT table" is the CT value required for the target
				  organism and the target level of inactivation. The sum of the inactivation
				  ratios, or total inactivation ratio for a series of disinfection sequences
				  is:
See
				  Image
and is calculated by adding together the inactivation ratio
				  for each disinfection sequence. In determining the total inactivation ratio,
				  the public water system owner or operator shall determine the residual
				  disinfectant concentration of each sequence and corresponding contact time
				  before any subsequent disinfection application points. A total inactivation
				  ratio equal to or greater than 1.0 is assumed to provide the target level of
				  disinfection of the target organism.
(19) "Department" means the department of
				natural resources.
(19m) "Dimension
				ratio" means the specified outside diameter of the pipe divided by the
				specified minimum wall thickness.
(20) "Disinfectant contact time" ("T" in CT
				calculations) means the time in minutes that it takes for water to move from
				the point of disinfectant application or the previous point of disinfectant
				residual measurement to a point before or at the point where residual
				disinfectant concentration ("C") is measured. Where only one "C" is measured,
				"T" is the time in minutes that it takes for water to move from the point of
				disinfectant application to a point before or where residual disinfectant
				concentration ("C") is measured. Where more than one "C" is measured, "T" is
				determined as follows:
(a) For the first
				measurement of "C", the time in minutes that it takes for water to move from
				the first or only point of disinfectant application to a point before or at the
				point where the first "C" is measured.
(b) For subsequent measurements of "C", the
				time in minutes that it takes for water to move from the previous "C"
				measurement point to the "C" measurement point for which the particular "T" is
				being calculated. Disinfectant contact time in pipelines shall be calculated
				based on "plug flow" by dividing the internal volume of the pipe by the maximum
				hourly flow rate through the pipe. Disinfectant contact time within mixing
				basins and storage reservoirs shall be determined by tracer studies or other
				department approved equivalent demonstration.