Saturday, April 4, 2009

TSDF - Hazardous Waste Sector - SWPPP - Stormwater Permit Proposed Requirements

On July 6, 2009, the Minnesota Pollution Control Agency released its proposed multisector industrial stormwater discharge general permit. This permit, once promulgated, will replace the existing industrial stormwater permit, which expired in October of 2002.

[Read a summary of the overall Minnesota permit, stormwater monitoring, and sector requirements]

Caltha LLP will be conducted seminars on the proposed sector requirements in July & August 2009. Caltha MPCA Industrial Stormwater Permit Requirements Seminars

The proposed permit details requirements for 29 different industrial sectors. The requirements described below are proposed for the Hazardous Waste Treatment, Storage, or Disposal Facilities Sector (Sector K). Sector K facilities are primarily engaged in treating, storing, or disposing of hazardous wastes, including those that are operating under interim status or a permit under subtitle C of RCRA. 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 are:

TSS 100 mg/L
pH 6-9
BOD 25 mg/L
COD 120 mg/L
Ammonia 34.8 mg/L
Lead 0.164 mg/L
Arsenic 0.680 mg/L
Cadmium 0.0078 mg/L
Zinc 0.234 mg/L
Total Chromium III 3.5 mg/L
Cyanide 0.045 mg/L
Selenium 0.040 mg/L
Silver 0.0041 mg/L

Note: Benchmarks for metals, cyanide and ammonia were derived based on the Aquatic Life Standards for these parameters in Minnesota Rules.

[Read more about use of Aquatic Life Standards to derive stormwater benchmarks]
[Read more about how benchmarks are used under the proposed MPCA industrial permit]
[Read more about what a 100 mg/L benchmark for TSS relates to]

Looking for other sector information? Click here for a link to all sector requirements

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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