Stormwater Pollution Prevention Plan - Phoenix Sky Harbor ...

Non-Mining MSGP 2010 General Permit
All Units
Benchmark Values (mg/L, total)
mg/L Cadmium Copper Lead Nickel Silver Zinc
175-200 0.0447 0.0447 0.2873 7.475 0.0106 2.001
200-225 0.0501 0.0500 0.3255 8.258 0.0130 2.211
225-250 0.0555 0.0552 0.3637 9.028 0.0156 2.417
250-275 0.0609 0.0601 0.4020 9.786 0.0183 2.620
275-300 0.0663 0.0655 0.4402 10.53 0.0213 2.821
300-325 0.0714 0.0706 0.4784 11.27 0.0244 3.019
325-350 0.0770 0.0757 0.5166 12.00 0.0278 3.214
350-375 0.0823 0.0800 0.5547 12.72 0.0312 3.408
375-400 0.0876 0.0859 0.5927 13.44 0.0349 3.599
How to Determine Hardness for Hardness-Dependent Parameters.
The permittee shall monitor stormwater discharges for parameters specified in Part 8 for the primary
industrial activity, and any co-located industrial activities authorized under this permit. If any of the
parameters are hardness-dependent, the permittee must also characterize for hardness. The results of
the general analytical monitoring, including hardness, shall be submitted to ADEQ in accordance with
Part 7. For discharges to:
Perennial or intermittent waters, the hardness shall be of the surface water receiving the
discharge.
Ephemeral waters, the hardness shall be of the discharge leaving the facility.
Hardness characterization of the receiving water shall include analysis of samples from the surface water
receiving the discharge or surface water data collected by a third party provided the data is credible,
scientifically defensible and is representative of current conditions. The data and the methodology for
determining the hardness values must be submitted to ADEQ in the first year of permit coverage to allow
ADEQ to compare monitoring results with applicable water quality standards. The permittee shall retain all
reports and monitoring data in accordance with Part 7.5 of the permit.
Stormwater Discharges Associated With Industrial Activity – Appendix D D-3