Stormwater Pollution Prevention Plan - Phoenix Sky Harbor ...

Non-mining MSGP 2010 General Permit
methods and related limits of detection (if applicable) for each parameter is required. The samples shall
be analyzed using analytical methods with a limit of quantitation (LOQ) that is at or below the benchmark
concentrations, ELGs or other criteria specified in this permit. If all methods have LOQs higher than the
specific criteria, the samples shall be analyzed using the analytical method with the lowest LOQ.
All laboratory analyses shall be conducted according to test procedures specified in 40 CFR 136,
unless other test procedures have been specified in this general permit. This requirement does not apply
to parameters that require analysis at the time of sample collection as long as the testing methods used
are approved by ADHS. The permittee may conduct field analysis of turbidity if the permittee has
sufficient capability (qualified and trained employees, properly calibrated and maintained field
instruments, etc.) to properly perform the field analysis.
6.1.3.4 Records.
The permittee shall retain records of all stormwater monitoring information and reports as part of
the SWPPP in accordance with Part 7.5 and any additional requirements in Appendix B, Subsection 11 of
this permit.
6.2 Required Monitoring.
This permit includes four types of required analytical monitoring, one or more of which may apply
to the facility’s discharge:
Benchmark monitoring (see Part 6.2.1)
Effluent limitations monitoring (see Part 6.2.2);
Impaired waters monitoring (see Part 6.2.3); and
Additional monitoring as required by ADEQ (see Part 6.2.4).
When more than one type of monitoring for the same parameter at the same outfall applies (e.g.,
total suspended solids once per year for an effluent limitation and twice per wet season for benchmark
monitoring at a given outfall), a single sample may be used to satisfy both monitoring requirements.
All required monitoring shall be conducted in accordance with the procedures described in
Appendix B, Subsection 11.D.
6.2.1 Benchmark Monitoring.
This permit stipulates pollutant benchmark concentrations for certain industry sectors. The
benchmark concentrations are not effluent limitations; a benchmark exceedance, therefore, is not a
permit violation. Benchmark monitoring data are primarily to determine the overall effectiveness of the
control measures and assist the permittee in knowing when to apply additional corrective action(s) to
comply with the effluent limitations in Part 2.
permit.
Additional sector-specific benchmark monitoring requirements may be described in Part 8 of this
6.2.1.1 Applicability of Benchmark Monitoring.
The permittee shall monitor stormwater discharges for all benchmark parameters specified
for the primary industrial activity and any co-located industrial activities, applicable to the
facility’s discharge. The industry-specific benchmark concentrations are listed in the sectorspecific
sections of Part 8. If the facility is in one of the industrial sectors subject to
benchmark concentrations that are hardness-dependent, the permittee must characterize for
hardness established per Appendix D procedures and submit results to ADEQ with the
benchmark report. For discharges to:
Perennial or intermittent waters, the hardness shall be of the surface water receiving the
discharge;
Stormwater Discharges Associated with Industrial Activity 26