Foundary - Primary Metals Sector - Arizona DEQ Draft Permit

The Arizona Department of Environmental Quality (ADEQ) recently released a final multisector industrial stormwater discharge general permit, known officially as the AZPDES Multi-Sector General Permit, or MSGP 2010. This permit will replace the existing industrial stormwater permit, which expired in 2005.

Review a summary of the draft ADEQ Industrial Stormwater Permit

The final permit details requirements for 30 different industrial sectors. The requirements described below are for the Primary Metals Sector (Sector F). Sector F covers a fairly broad range of facility types, including steel works, blast furnaces, and rolling and finishing mills, iron and steel foundries, primary smelting and refining of nonferrous metals, secondary smelting and refining of nonferrous metals, rolling, drawing, and extruding of nonferrous metals, nonferrous foundries and other primary metal products These requirements are in addition to permit requirements that apply to all sectors.

Inspections:
The facility must conduct inspections addressing air pollution control equipment (e.g., baghouses, electrostatic precipitators, scrubbers, and cyclones) for any signs of degradation (e.g., leaks, corrosion, or improper operation) that could limit their efficiency and lead to excessive emissions. The operation must monitor air flow at inlets and outlets (or use equivalent measures) to check for leaks (e.g., particulate deposition) or blockage in ducts. Also inspect all process and material handling equipment (e.g., conveyors, cranes, and vehicles) for leaks, drips, or the potential loss of material.

Good Housekeeping:
Good housekeeping practices must include a cleaning and maintenance program for all impervious areas of the facility where particulate matter, dust, or debris may accumulate, especially areas where material loading and unloading, storage, handling, and processing occur. The operation must also implement a cleaning program which includes regular sweeping for the paving of areas where vehicle traffic or material storage occur but where vegetative or other stabilization methods are not practicable. For unstabilized areas where sweeping is not practicable, the operation must select an alternative stormwater management devices that effectively trap or remove sediment.

Stormwater Monitoring Benchmarks:
All facilities are required to conduct visual and chemical (benchmark) monitoring. For benchmark monitoring, the benchmark concentrations or values depend on facility type:

Steel Works, Blast Furnaces, and Rolling and Finishing Mills (SIC 3312-3317):
Total Aluminum 0.75 mg/L
Total Zinc 0.04 to 0.26 mg/L, depending on hardness

Iron and Steel Foundries (SIC 3321-3325):
TSS 100 mg/L
Total Aluminum 0.75 mg/L
Total Iron 1.0 mg/L
Total Zinc 0.04 to 0.26 mg/L, depending on hardness
Total Copper 0.004 to 0.033 mg/L, depending on hardness

Rolling, Drawing, and Extruding of Nonferrous Metals (SIC 3351-3357):
Total Zinc 0.04 to 0.26 mg/L, depending on hardness
Total Copper 0.004 to 0.033 mg/L, depending on hardness

Nonferrous Foundries(SIC 3363-3369):
Total Zinc 0.04 to 0.26 mg/L, depending on hardness
Total Copper 0.004 to 0.033 mg/L, depending on hardness

[Read more about what a 100 mg/L benchmark for TSS relates to]

[Read more about ADEQ stormwater monitoring requirements and industrial stormwater benchmarks]

Looking for other sector information? Click here for information on proposed stormwater requirements for specific sector.

Caltha LLP provides expert consulting services to public and private sector clients nationwide to address Stormwater Permitting & Regulatory Support, Stormwater Pollution Prevention Plans (SWPPP), Stormwater Monitoring and Stormwater Training.

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