Wednesday, April 29, 2009

Arkansas Multisector Industrial Stormwater Discharge Permit

This article has been updated:

Final Arkansas ADEQ Industrial Stormwater Discharge Permit


The Arkansas Department of Environmental Quality (ADEQ) has recently released its draft industrial stormwater discharge permit for public review and comment. The revised permit will replace the existing permit.

Some of the key elements of the draft permit include:

Mult-sector requirements. The draft permit now regulates permitees based on INDUSTRIAL SECTOR designations, rather than SIC code alone. The draft incorporates sector specific stormwater monitoring and benchmark requirements; however, no sector specific stormwater controls or SWPPP requirements are included.

Visual Stormwater Inspections (“visual monitoring”). The draft permit requires a minimum of quarterly visual stormwater monitoring events, in addition to chemical (“benchmark”) monitoring. Once per year, outfalls will also need to be examined during dry weather to confirm the elimination of non-stormwater discharges.

Comprehensive Site Compliance Evaluation. Once each year, qualified personnel must conduct a site compliance evaluations. The evaluation must include a visual inspection for evidence of, or the potential for, pollutants entering the drainage system. Measures to reduce pollutant loadings shall be evaluated to determine whether they are adequate and properly implemented, or whether additional control measures are needed. A visual inspection of equipment needed to implement the spill response equipment must also be

Benchmark Monitoring. Twice each year, a sample must be collected at each stormwater outfall and analyzed for four general effluent characteristic parameters, plus any sector-specific monitoring parameters.

[Read more about proposed ADEQ sector specific stormwater benchmark concentrations]

The Arkansas Department of Environmental Quality (ADEQ) has made available the proposed industrial stormwater permit on its website. The permit is open for public comment until May 11, 2009.

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
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