Monday, February 22, 2010

Textile Mills - Apparel & Fabric Products Sector - MN 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 permit details requirements for 29 different industrial sectors. The requirements described below are for the Textile Mills, Apparel, and Other Fabric Products Sector (Sector V). Sector V facilities are engaged in textile mill product preparation, the manufacture of apparel, fabrics, carpets and rugs, and leather products; dyeing and finishing of fibers, yarn fabrics, and knit. These requirements are in addition to permit requirements that apply to all sectors.

In addition to routine inspection requirements, the operation must conduct two of the monthly inspections during runoff events. One of the inspections must be performed during a snow melt runoff event. Each inspection must include a visual assessment of the runoff to identify any visible sheens or films that indicate the presence of oil or grease in the discharge.

Preventive Maintenance:
The site SWPPP must include use of spill and overflow protection; and covering or enclosing areas where the transfer of materials occurs. The SWPPP must also address the replacement or repair of leaking connections, valves, transfer lines, and pipes that carry chemicals, dyes, or wastewater.

Potential Pollutant Sources:
The site SWPPP must also describe potential pollutant sources including numerous specific listed processes and activities specific to this sector.

Stormwater Monitoring Benchmarks:
All facilities are required to conduct visual and chemical (benchmark) monitoring. The benchmark concentrations or values are:

TSS 100 mg/L

[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

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