Monday, February 22, 2010

Hazardous Waste TSDF Requirements - MPCA Stormwater Permit

The Minnesota Pollution Control Agency (MPCA) has issued its revised multi-sector industrial stormwater discharge general permit (MSGP). This permit 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]

All manufacturing, industrial and “industrial-like” sites that require a permit to discharge stormwater will be required to come into compliance with the revised permit, and to submit an application for permit coverage by either June 1, August 1 or October 1, depending on their industrial sector.

Click here to review a list affected industrial sectors and application deadlines for each sector

The revised Minnesota permit details requirements for 29 different industrial sectors. The requirements described below are 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

In additon, hazardous waste landfills and any landfill that discharges to a surface water, and where stormwater has directly contacted solid waste may be subject to effluent limitations.

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 revised 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 in Minnesota 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

No comments: