Monday, February 1, 2010

ADEQ Requirements - Glass Clay Cement Concrete Sector

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

Review a summary of the ADEQ Industrial Stormwater Permit

The proposed permit details requirements for 30 different industrial sectors. The requirements described below are proposed for the Glass, Clay, Cement, Concrete, and Gypsum Products Sector (Sector E). Sector E covers a fairly broad range of product types, including flat glass, glass containers, pressed and blown glass, hydraulic cement, structural clay products, pottery and related products, concrete, gypsum, and plaster products, glass products, cut stone and stone products, abrasives, asbestos products, and miscellaneous non metal mineral products, mineral wool and mineral wool insulation products, and non-clay refractories. These requirements are in addition to permit requirements that apply to all sectors.

The facility must conduct inspections of dust collection and containment systems.

Good Housekeeping:
The facility must prevent or minimize the discharge of spilled cement, aggregate (including sand or gravel), kiln dust, fly ash, or settled dust from paved portions of the facility that are exposed to stormwater. Each facility must determine the frequency of sweeping or equivalent by the amount of industrial activity occurring in the area and the frequency of exposure to stormwater, but it must be performed at least once a week, if cement, aggregate, kiln dust, fly ash, or settled dust are being handled or processed. The operation must also prevent the exposure of fine granular solids (cement, fly ash, kiln dust, etc.) to stormwater.

For facilities producing ready-mix concrete, concrete block, brick, or similar products preventive measures must certify that process wastewater resulting from washing trucks, mixers, transport buckets, forms, or other equipment are discharged in accordance with a separate applicable NPDES permit..

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:

Clay Products Manufacturers (SIC 3251-3259, 3261-3269):
Total Aluminum 0.75 mg/L
TSS 100 mg/L

Concrete and Gypsum Product Manufacturers (SIC 3271-3275):
TSS 100 mg/L
Total Iron 1.0 mg/L

The permit established EFFLUENT LIMITS for stormwater discharges from material storage piles at cement manufacturing facilities.

[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]

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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