Stormwater Pollution Prevention Plan - Phoenix Sky Harbor ...

Non-mining MSGP 2010 General Permit
8.K.4.5
8.K.4.6
8.K.5
Leachate - liquid that has passed through or emerged from solid waste and contains soluble,
suspended, or miscible materials removed from such waste.
Non-contaminated stormwater - stormwater that does not come into direct contact with landfill
wastes, the waste handling and treatment areas, or landfill wastewater as defined in Part
8.K.4.4. Non-contaminated stormwater includes stormwater that flows off the cap, cover,
intermediate cover, daily cover, and/or final cover of the landfill.
Sector-Specific Benchmarks
Table 8.K-1 identifies benchmarks that apply to the specific subsectors of Sector K. These benchmarks
apply to both the facility’s primary industrial activity and any co-located industrial activities, which describe
the site’s activities.
Subsector
(Facility discharges may be subject to
requirements for more than one
sector/subsector)
Subsector K1. ALL - Industrial Activity
Code “HZ” (Note: permit coverage limited
in some States). Benchmarks only
applicable to discharges not subject to
effluent limitations in 40 CFR Part 445
Subpart A (see below).
Table 8.K-1
Parameter
Ammonia
Total Magnesium
Chemical Oxygen Demand (COD)
Total Arsenic
Total Cadmium 1
Total Cyanide
Total Lead 1
Total Mercury
Total Selenium
Total Silver 1
Benchmark
Monitoring
Concentration
2.14 mg/L
0.064 mg/L
120 mg/L
0.15 mg/L
Hardness Dependent
0.022 mg/ L
Hardness Dependent
0.0014 mg/ L
0.005 mg/L
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
(mg/L)
For discharges to perennial
and intermittent
waterbodies
For discharges to ephemeral
waterbodies
Cadmium Lead Silver Cadmium Lead Silver
(mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L)
0-25 0.0020 0.014 0.0003 0.0059 0.0293 0.0003
25-50 0.0040 0.030 0.0010 0.0116 0.0636 0.0010
50-75 0.0060 0.047 0.0020 0.0172 0.0995 0.0020
75-100 0.0079 0.065 0.0032 0.0228 0.1363 0.0032
100-125 0.0096 0.082 0.0047 0.0286 0.1736 0.0047
Stormwater Discharges Associated with Industrial Activity – Sector K 50