Wisconsin Administrative Code › Department of Natural Resources › NR 200-299 - Environmental Protection - Wisconsin Pollutant Discharge Elimination System › Chapter NR 207 - Antidegradation and Antibacksliding › Subchapter I - Antidegradation › Section NR 207.02 - Definitions

Current through June 24, 2024
In addition to the definitions in ch. NR 205, the following
					 definitions apply to this chapter:
(1)
				  "Assimilative capacity" means the difference between the water quality
				  criterion for a substance identified in ch. NR 102 or 105 and the existing
				  level of that substance in a surface water.
(2) "Bioaccumulation factor" means the ratio
				  of the concentration of a substance in an aquatic organism to the concentration
				  of the substance in water to which the organism is exposed regardless of
				  whether the concentration in the organism results solely from body contact with
				  the water or from body contact plus ingestion of food contaminated with the
				  substance, as determined under ch. NR 105 and associated technical support
				  documents.
(3) "Exceptional
				  resource waters" means any surface water, or portion thereof, in s.
				  NR
				  102.11.
(4) "Fish and aquatic life water" means any
				  surface water, or portion thereof, in s.
				  NR
				  102.13.
(5) "Great Lakes system" means any surface
				  water in s.
				  NR
				  102.12(1).
(6)
(a)
				  "Increased discharge" means any change in concentration, level or loading of a
				  substance which would exceed an effluent limitation specified in a current
				  WPDES permit.
(b) Except as
				  provided in par. (c), increased discharge does not include the initial
				  imposition of effluent limitations for substances which were in a previous
				  discharge but which had not been limited in a prior or the current permit
				  unless the initial imposition of effluent limitations occurs due to a changed
				  discharge location, other than a change in location necessary to accommodate a
				  mixing zone as provided for in ch. NR 106.
(c) For discharges of bioaccumulative
				  chemicals of concern (BCCs), defined in s.
				  NR
				  105.03(9), to the Great Lakes system,
				  increased discharge means:
1. An increased
				  discharge as defined in par. (a);
2. The initial imposition of an effluent
				  limitation for a BCC that occurs due to an actual or expected increase in
				  loading of the BCC; and
3. Any
				  actual or expected increase in loading of a BCC which is caused by or will be
				  caused by a facility expansion, a process modification, or the connection to an
				  existing public or private wastewater treatment system of a substantial source
				  of untreated or pretreated effluent containing BCCs, and which requires
				  notification to the department pursuant to s.
				  NR 205.07(2) (a) or (3) (c) or
				  (d). Under this subdivision, increased
				  discharge does not include any increase in the loading of BCCs that is caused
				  by normal operational variability, changes in intake pollutants or increasing
				  the rate or hours of production within the existing production capacity. Normal
				  operational variability includes, for POTWs, any additional wastewater volume
				  within the existing capacity of the POTW from commercial, industrial or
				  residential growth which do not normally contribute substantial quantities of
				  BCCs to the POTW's wastewater flow.