Sector-Specific Benchmark Values and Effluent Limitations: Sector - N. Discharges may be subject to requirements for more than one sector or subsector.
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Subsector Parameter Benchmark Values
N1 Scrap Recycling Facilities Solids, Total Suspended (TSS) 100 mg/L 2
COD (Chemical Oxygen Demand) 120 mg/L
Aluminum, Total (as Al) 1.5 mg/L
Copper, Total (as Cu) 0.028 mg/L 1
Iron, Total (as Fe) 1.0 mg/L
Lead, Total (as Pb) 0.164 mg/L 1
Zinc, Total (as Zn) 0.234 mg/L 1
pH 3 6.0-9.0 SU

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.
3For 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 18:22.

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