Stormwater Pollution Prevention Plan - Phoenix Sky Harbor ...

Non-mining MSGP 2010 General Permit
Subsector
(Facility discharges may be subject to
requirements for more than one
sector/subsector)
Subsector C1. Agricultural Chemicals
(SIC 2873-2879)
Subsector C2. Industrial Inorganic Chemicals
(SIC 2812-2819)
Table 8.C-1
Parameter
Nitrate plus Nitrite Nitrogen
Total Lead 1
Total Iron
Total Zinc 1
Phosphorus
Total Aluminum
Total Iron
Nitrate plus Nitrite Nitrogen
Benchmark Monitoring
Concentration
Reserved
Hardness Dependent
1.0 mg/L
Hardness Dependent
2.0 mg/L
0.75 mg/ L
1.0 mg/L
Reserved
Subsector C3. Soaps, Detergents, Cosmetics, Nitrate plus Nitrite Nitrogen Reserved
and Perfumes (SIC 2841-2844) Total Zinc 1 Hardness Dependent
Subsector C4. Plastics, Synthetics, and Resins
(SIC 2821-2824)
Total Zinc 1
Hardness Dependent
1
The benchmark values of some metals are dependent on water hardness. For these parameters,
permittees must determine the hardness of the receiving water (see Appendix D, “Calculating Hardness
in Receiving Waters for Hardness Dependent Metals,” for methodology), in accordance with Part 6.2.1.1,
to identify the applicable ‘hardness range’ for determining their benchmark value applicable to their
facility. The ranges occur in 25 mg/L increments. Hardness Dependent Benchmarks follow in the table
below:
Benchmark values based on hardness and receiving waterbody
Water Hardness Range
For discharges to
perennial and
intermittent
waterbodies
Lead Zinc
(mg/L) (mg/L)
For discharges to
ephemeral
waterbodies
(mg/L)
Lead Zinc
(mg/L) (mg/L)
0-25 0.014 0.0362 0.0293 0.344
25-50 0.030 0.0651 0.0636 0.618
50-75 0.047 0.0918 0.0995 0.871
75-100 0.065 0.1170 0.1363 1.112
100-125 0.082 0.1417 0.1736 1.343
125-150 0.100 0.1652 0.2113 1.568
150-175 0.118 0.1883 0.2492 1.787
175-200 0.136 0.2108 0.2873 2.001
200-225 0.154 0.2329 0.3255 2.211
225-250 0.172 0.2547 0.3637 2.417
250-275 0.190 0.2761 0.4020 2.620
275-300 0.209 0.2972 0.4402 2.821
Stormwater Discharges Associated with Industrial Activity – Sector C 39