Wisconsin Administrative Code › Department of Natural Resources › NR 200-299 - Environmental Protection - Wisconsin Pollutant Discharge Elimination System › Chapter NR 211 - General Pretreatment Requirements › Subchapter I - Industrial User Requirements › Section NR 211.13 - Removal credits

Current through June 24, 2024
(1)
(a) Any
				  POTW receiving wastes from an industrial user to which a categorical
				  pretreatment standard applies may, subject to the conditions of this section,
				  grant removal credits for removal by the POTW of pollutants specified in the
				  categorical pretreatment standard. The POTW may grant a removal credit equal to
				  or less than its consistent removal rate. Upon being granted a removal credit,
				  each affected industrial user shall calculate its revised discharge limits in
				  accordance with par. (c).
(b) A
				  POTW may give removal credits only if:
1. The
				  POTW applies for and receives authorization from the department to give a
				  removal credit in accordance with the requirements and procedures specified in
				  sub. (5). Removal credits may only be given for indicator or surrogate
				  pollutants regulated in a categorical pretreatment standard if the categorical
				  pretreatment standard so specifies.
2. The POTW demonstrates and continues to
				  achieve consistent removal of the pollutant in accordance with sub.
				  (2).
3. Except as provided in sub.
				  (7), the POTW has an approved pretreatment program as required by this chapter;
				  however, a POTW which does not have an approved pretreatment program may,
				  pending approval of such a program, conditionally give credits as provided in
				  sub. (4).
4. The granting of
				  removal credits will not cause the POTW to violate the local, state and federal
				  sludge requirements which apply to the sludge management method chosen by the
				  POTW. Alternatively, the POTW can demonstrate to the department that even
				  though it is not presently in compliance with applicable sludge requirements,
				  it will be in compliance when the industrial user to whom the removal credit
				  would apply is required to meet its modified categorical pretreatment
				  standard.
5. The granting of
				  removal credits will not cause a violation of the POTW's permit limitations or
				  conditions. Alternatively, the POTW can demonstrate to the department that even
				  though it is not presently in compliance with applicable limitations and
				  conditions in its WPDES permit, it will be in compliance when the industrial
				  user to whom the removal credit would apply is required to meet its modified
				  categorical pretreatment standard.
6. The granting of removal credits will not
				  result in a discharge of pollutants to waters of the state greater than the
				  discharge that would be allowed if the pollutants were discharged other than
				  through a POTW.
(c)
				  Revised discharge limits for a specific pollutant shall be derived by use of
				  the following formula:
See
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where:
x = pollutant discharge limit specified in the applicable
					 categorical pretreatment standard.
r = removal credit for that pollutant as established under
					 sub. (2) (percentage removal expressed as a proportion, i.e., a number between
					 0 and 1).
y = revised discharge limit for the specified pollutant
					 (expressed in same units as x).