Sector-Specific Benchmark Values and Effluent Limitations: Sector - K. Discharges may be subject to requirements for more than one sector or subsector.
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Subsector Parameter Benchmark Values Effluent Limits
K1 Industrial Activity Code HZ. Benchmark Parameters Only Applicable To Discharges Not Subject To Effluent Limitations In 40 CFR Part 445 Subpart A Solids, Total Suspended (TSS) 100 mg/L 2 Effluent Monitoring Not Required
Nitrogen, Ammonia, Total (as N) 2.8 mg/L Effluent Monitoring Not Required
COD (Chemical Oxygen Demand) 120 mg/L Effluent Monitoring Not Required
BOD, Carbonaceous 05 Day (20 Deg C) 25 mg/L Effluent Monitoring Not Required
Lead, Total (as Pb) 0.164 mg/L 1 Effluent Monitoring Not Required
Arsenic, Total (as As) 0.680 mg/L Effluent Monitoring Not Required
Cadmium, Total (as Cd) 0.0078 mg/L 1 Effluent Monitoring Not Required
Zinc, Total (as Zn) 0.234 mg/L 1 Effluent Monitoring Not Required
Chromium, Total (as Cr) 3.5 mg/L 1 Effluent Monitoring Not Required
pH 6.0-9.0 SU 4 Effluent Monitoring Not Required
Cyanide, Total (as CN) 0.045 mg/L Effluent Monitoring Not Required
Selenium, Total (as Se) 0.040 mg/L Effluent Monitoring Not Required
Silver, Total (as Ag) 0.0041 mg/L 1 Effluent Monitoring Not Required
K23 Discharges From Hazardous Waste Landfills Subject To Effluent Limitations In 40 CFR Part 445 Subpart A Solids, Total Suspended (TSS) Benchmark Monitoring Not Required 88 mg/L daily maximum
27 mg/L calendar month average
Nitrogen, Ammonia, Total (as N) Benchmark Monitoring Not Required 10 mg/L daily maximum
4.9 mg/L calendar month average
BOD, Carbonaceous 05 Day (20 Deg C) Benchmark Monitoring Not Required 220 mg/L daily maximum
56 mg/L calendar month average
Arsenic, Total (as As) Benchmark Monitoring Not Required 1.1 mg/L daily maximum
0.54 mg/L calendar month average
Phenol Benchmark Monitoring Not Required 0.048 mg/L daily maximum
0.029 mg/L calendar month average
Zinc, Total (as Zn) Benchmark Monitoring Not Required 0.535 mg/L daily maximum
0.296 mg/L calendar month average
Chromium, Total (as Cr) Benchmark Monitoring Not Required 1.1 mg/L daily maximum
0.46 mg/L calendar month average
pH Benchmark Monitoring Not Required 6.0 SU, instantaneous minimum 9.0 SU, instantaneous maximum
Alpha-Terpineol Benchmark Monitoring Not Required 0.042 mg/L daily maximum
0.019 mg/L calendar month average
Aniline Benchmark Monitoring Not Required 0.024 mg/L daily maximum
0.015 mg/L calendar month average
Benzoic Acid Benchmark Monitoring Not Required 0.119 mg/L daily maximum
0.073 mg/L calendar month average
Naphthalene Benchmark Monitoring Not Required 0.059 mg/L daily maximum
0.022 mg/L calendar month average
p-Cresol Benchmark Monitoring Not Required 0.024 mg/L daily maximum
0.015 mg/L calendar month average
Pyridine Benchmark Monitoring Not Required 0.072 mg/L daily maximum
0.025 mg/L calendar month average

1The benchmark values of some metals are influenced by water hardness. For these parameters, the Permittee may determine the hardness of the stormwater discharges to identify the applicable ‘hardness range’ for determining their benchmark value. See Table 4 of Appendix B for hardness dependent benchmark values in accordance with Minn. R. 7050.0222 and Minn. R. 7052.0100.
2If the Permittee is required to comply with Appendix A, part F.1, the benchmark value for Solids, Total Suspended (TSS) is 65 mg/L, instead of 100 mg/L.
3As set forth at 40 CFR Part 445 Subpart A, these numeric limitations apply to contaminated stormwater discharges from hazardous waste landfills subject to the provisions of RCRA Subtitle C at 40 CFR Parts 264 (Subpart N) and 265 (Subpart N) except for any of the following facilities:

a. landfills operated in conjunction with other industrial or commercial operations when the landfill receives only wastes generated by the industrial or commercial operation directly associated with the landfill;
b. landfills operated in conjunction with other industrial or commercial operations when the landfill receives wastes generated by the industrial or commercial operation directly associated with the landfill and also receives other wastes, provided that the other wastes received for disposal are generated by a facility that is subject to the same provisions in 40 CFR Subchapter N as the industrial or commercial operation or that the other wastes received are of similar nature to the wastes generated by the industrial or commercial operation;
c. landfills operated in conjunction with Centralized Waste Treatment (CWT) facilities subject to 40 CFR Part 437, so long as the CWT facility commingles the landfill wastewater with other non-landfill wastewater for discharge. A landfill directly associated with a CWT facility is subject to this part if the CWT facility discharges landfill wastewater separately from other CWT wastewater or commingles the wastewater from its landfill only with wastewater from other landfills; or
d. landfills operated in conjunction with other industrial or commercial operations when the landfill receives wastes from public service activities, so long as the company owning the landfill does not receive a fee or other remuneration for the disposal service.

4For purposes of benchmark pH monitoring, the Permittee is required to report instantaneous results only, and not a calculation of pH averages. pH measurements are logarithmic, and the Agency will be performing a logarithmic average for this parameter using the instantaneous results submitted.

This page was last edited on 30 April 2015, at 20:06.