Wisconsin Administrative Code › Department of Natural Resources › NR 200-299 - Environmental Protection - Wisconsin Pollutant Discharge Elimination System › Chapter NR 210 - Sewage Treatment Works › Subchapter I - General › Section NR 210.03 - Definitions

Current through June 24, 2024
The definitions of terms and meanings of abbreviations used
					 in this chapter are set forth in s.
					 283.01, Stats., chs.
					 NR 205 and 218, and as
					 follows:
(1) "7-day average" means the
				  arithmetic mean of pollutant parameter values for samples collected in a period
				  of 7 consecutive days.
(2) "30-day
				  average" means the arithmetic mean of pollutant parameter values for samples
				  collected in a period of 30 consecutive days.
(2e) "Blending" means the routing of
				  untreated or partially treated wastewater around a biological treatment
				  process, or a portion of a biological treatment process, within a sewage
				  treatment facility. The routing of untreated or partially treated wastewater
				  around a portion of a biological treatment process is considered to be blending
				  only if the entire wastewater flow has not received biological
				  treatment.
(2m) "Building backup"
				  means an accumulation of sewage in any public or private building caused by
				  blockage, failure, or other hydraulic constraint in the sewage collection
				  system or by blockage or failure of the building sewer or private interceptor
				  main sewer.
Note:
The discharge from a building sewer or
					 private interceptor main sewer directly to a water of the state may be a
					 sanitary sewer overflow and may be subject to the WPDES permit requirements of
					 ch. 283, Stats.
(2s)
				  "Building sewer" has the meaning specified under s.
				  NR
				  110.03(6s).
Note:
Section
					 NR
					 110.03(6s) reads: "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.
(3)
				  "CBOD5" means the 5-day carbonaceous biochemical oxygen
				  demand.
(3d) "CMOM" means a
				  capacity, management, operation, and maintenance program under s.
				  NR
				  210.23.
(3h) "Combined sewer overflow" means a
				  release of wastewater from a combined sewer system directly into a water of the
				  state or to the land surface.
(3p)
				  "Combined sewer system" means a wastewater collection system owned by a
				  municipality that conveys domestic, commercial, and industrial wastewater and
				  storm water runoff through a single pipe system to a publicly owned treatment
				  works.
(3t) "Combined sewer
				  treatment facility" has the meaning specified under s.
				  NR
				  110.03(7s).
Note:
Section
					 NR
					 110.03(7s) reads: "Combined sewer
					 treatment facility" means all the structures, pipes, and other equipment that
					 constitute the various treatment processes and treatment units employed to
					 reduce pollutants in wastewater from combined sewer systems.
(4) "Disinfection" means the operation of an
				  ultraviolet lamp unit, or the addition of chemical disinfectants with adequate
				  mixing and detention times, to provide pathogen reductions.
(5) "Effluent concentrations consistently
				  achievable through proper operation and maintenance" means:
(a) For a given pollutant parameter, the 95th
				  percentile value for the 30-day average effluent quality achieved by a
				  treatment works in a period of at least 2 years, excluding values attributable
				  to upsets, bypasses, operational errors, or other unusual conditions,
				  and
(b) A 7-day average value equal
				  to 1.5 times the value derived under par. (a).