Wisconsin Administrative Code
Department of Natural Resources
NR 200-299 - Environmental Protection Wisconsin Pollutant Discharge Elimination System
Chapter NR 235 - Organic chemical manufacturing
Subchapter I - General Provisions
Section NR 235.02 - Applicability

(1) This chapter applies to process wastewater discharges from all facilities or portions of facilities that manufacture the organic chemicals, plastics and synthetic fibers (OCPSF) products or product groups covered by subchs. II to VIII and are included within the following U.S. department of commerce bureau of the census standard industrial classification (SIC) groups:

(2) This chapter applies to wastewater discharges from OCPSF research and development, pilot plant, technical service and laboratory bench scale operations if these operations are conducted in conjunction with and related to existing OCPSF manufacturing activities at the facility site.

(3) This chapter does not apply to discharges resulting from the manufacture of OCPSF products included in the following SIC subgroups, if a facility has reported under the following subgroups rather than under the SIC groups listed in sub. (1):

(4) This chapter does not apply to discharges for which a different set of previously promulgated effluent limitations guidelines and standards apply, unless the facility reports OCPSF products under SIC codes 2821, 2865 or 2869, and the facility's OCPSF wastewaters are treated in a separate treatment system or discharged separately to a POTW.

(5) This chapter does not apply to any process wastewater discharges from the manufacture of organic chemical compounds solely by extraction from plant and animal raw materials or by fermentation processes.

(6) This chapter does not apply to wastewater discharges of chromium, copper, lead, nickel or zinc in complexed metal-bearing waste streams listed as follows:

(7) This chapter does not apply to discharges of cyanide in cyanide bearing waste streams listed in Appendix A if the department or control authority does the following:

(8) Discharge limitations for chromium, copper, lead, nickel and zinc or discharge standards for lead and zinc may be established for waste streams not listed in Appendix A and not otherwise determined to be metal-bearing waste streams if the department or control authority determines that the wastewater metals contamination is due to background levels that are not reasonably avoidable from sources such as intake water, corrosion of construction materials or contamination of raw materials. The determination shall be based upon a review of relevant facility operating conditions, process chemistry, engineering and sampling and analysis information. An analysis of the sources and levels of the metals, based on the foregoing information, shall be in writing as follows:

(9) Any existing or new source direct discharge point source subject to 2 or more of subchs. II through VIII shall achieve BOD5 and TSS discharges not exceeding the quantity or mass determined by multiplying the total OCPSF process wastewater flow subject to subchs. II to VIII times the following OCPSF production-proportioned concentration: For a specific facility, wx is the proportion of the facility's total OCPSF production in subcategory X. Then the facility-specific production-proportioned concentration limitations are given by:

and

The "BOD5 LimitX" and "TSS LimitX" are the respective subcategorical BOD5 and the TSS maximum for any one day or maximum for monthly average limitations.