Sector - K Sector - K

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.