Monday, February 1, 2010

Chemical Sector - Final ADEQ Stormwater Permit

The Arizona Department of Environmental Quality (ADEQ) has finalized its 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 2010 draft ADEQ Industrial Stormwater Permit

The final permit details requirements for 30 different industrial sectors. The requirements described below are for the Chemical and Allied Products Manufacturing Sector (Sector C). Sector C covers a fairly broad range of product types, including industrial inorganic and organic chemicals, plastic materials and synthetic resins, synthetic rubbers and human-made fibers, soap and detergents, specialty cleaning, polishing, and sanitation preparations, surface active preparations, perfumes, cosmetics, paints, wood fillers and sealers, paint and varnish removers, adhesives, glues, caulking compounds, explosives, inks, fertilizers, pesticides, and other agricultural chemicals, medicinal and pharmaceutical chemicals. These requirements are in addition to permit requirements that apply to all sectors.

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

Agricultural Chemicals (SIC 2873-2879):
Nitrate 0.68 mg/L
Total Zinc 0.04 to 0.26 mg/L, depending on hardness
Total Lead 0.014 to 0.262 mg/L, depending on hardness
Total Iron 1.0 mg/L
Phosphorus 2.0 mg/L

Industrial Inorganic Chemicals (SIC 2812-2819):
Total Aluminum 0.75 mg/L
Total Iron 1.0 mg/L
Nitrate 0.68 mg/L

Soaps, Detergents, Cosmetics, and Perfumes (SIC 2841-2844):
Nitrate 0.68 mg/L
Total Zinc 0.04 to 0.26 mg/L, depending on hardness

The permit also establishes EFFLUENT LIMITS for runoff from phosphate fertilizer manufacturing facilities (SIC 2874) that comes into contact with any raw materials, finished product, by-products or waste products.

[What is the difference between a “bench mark” and a permit or effluent limit?]

[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.

For further information contact Caltha LLP at
Caltha LLP Website

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