Monday, July 6, 2009

Treatment Works (POTW) 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 an overall summary of the proposed MPCA Industrial Stormwater Permit]]

Some key changes in the July 6, 2009 proposed permit are the additional details for 29 different sector specific requirements. The requirements described below are proposed for the Treatment Works Sector (Sector T). Sector T facilities are engaging in treating domestic sewage, or any other sewage sludge or wastewater treatment device or system used in the storage, treatment, recycling, and reclamation of municipal or domestic sewage; including land dedicated to the disposal of sewage sludge; that are located within the confines of the facility with a design flow of 1.0 million gallons per day (MGD) or more; or are required to have an approved pretreatment program under 40 CFR Part 403. These requirements are in addition to permit requirements that apply to all sectors.

Employee Training:
In addition to other training requirements, employee training programs need to include training:
1) petroleum product management;
2) process chemical management;
3) fueling procedures; and
4) proper procedures for using fertilizer, herbicides, and pesticides.

Routine inspections must include:
1) access roads and rail lines;
2) grit, screenings, and other solids handling areas;
3) sludge drying beds;
4) dried sludge piles;
5) compost piles; and
6) septage or hauled waste receiving stations.

Potential Pollutant Sources:
The site SWPPP must also describe potential pollutant sources including solids handling areas; sludge drying areas; compost piles; septage or hauled waste receiving stations; and access roads and rail lines.

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

TSS 100 mg/L
BOD 25 mg/L

[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]

Caltha LLP is conducting seminars in several cities across Minnesota to provide an overview of what the proposed MPCA permit requirements are and potential impacts on affected facilities. For more information, go to:
MPCA Proposed Industrial Stormwater Requirements Seminar

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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