C. Chemical and Allied Products Manufacturing

1. Authorized Stormwater Discharges

The requirements in Sector C apply to stormwater discharges associated with industrial activity from Chemical and Allied Products Manufacturing facilities as identified by the industrial activity codes specified in Table 5 of Appendix D.

2. Industrial Activities Authorized by Sector C

Permittees under Sector C are primarily engaged in the following types of activities:

a. Industrial inorganic chemicals.

b. Plastic materials and synthetic resins, synthetic rubbers, and cellulosic and other human made fibers, except glass.

c. Soap and other detergents, including facilities producing glycerin from vegetable and animal fats and oils; specialty cleaning, polishing, and sanitation preparations.

d. Surface active preparations used as emulsifiers, wetting agents, and finishing agents, including sulfonated oils; and perfumes, cosmetics, and other toilet preparations.

e. Paints (in paste and ready-mixed form); varnishes; lacquers; enamels and shellac; putties, wood fillers, and sealers; paint and varnish removers; paint brush cleaners; and allied paint producers.

f. Industrial organic chemicals.

g. Industrial and household adhesives, glues, caulking compounds, sealants, and linoleum, tile, and rubber cements from vegetable, animal, or synthetic plastic materials; explosives; printing ink, including gravure, screen process, and lithographic inks; miscellaneous chemical preparations such as fatty acids, essential oils, gelatin (except vegetable), sizes, bluing, laundry soaps, writing and stamp pad ink, industrial compounds such as boiler and heat insulating compounds, and chemical supplies for foundries.

h. Ink and paints, including china painting enamels, India ink (a type of drawing ink), platinum paints for burnt wood or leather work, paints for china painting, artist’s paints and water colors.

i. Nitrogenous and phosphatic basic fertilizers, mixed fertilizers, pesticides, and other agricultural chemicals.

j. Medicinal chemicals and botanical products; pharmaceutical preparations in vitro and in vivo diagnostic substances; biological products, except diagnostic substances.

3. Limitations on Authorization

The following discharges are not authorized by this permit:

a. Non-stormwater discharges containing inks, paints, other hazardous or nonhazardous substances, etc. resulting from an on-site spill, including materials collected in drip pans.

b. Washwater from material handling and processing areas.

c. Washwater from drum, tank, or container rinsing and cleaning.

d. Discharges of runoff from coal yards and coal piles. The discharge of any coal yard and coal pile runoff is considered a wastewater and shall be regulated by a separate NPDES/SDS permit.

4. Sector-Specific Definitions (No Additional Definitions)

5. Stormwater Controls

a. Employee Training (No additional requirements).

b. Erosion and Sedimentation Controls (No additional requirements).

c. Good Housekeeping (No additional requirements).

d. Inspections.

In addition to the inspection requirements outlined in Part III.G., the Permittee shall ensure that a total of two (2) of the required monthly inspections occur during runoff events, with at least one being performed during snow melt. Each inspection shall 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. If sheens are present in stormwater discharges, corrective actions to prevent sheen shall be implemented and documented in the SWPPP.

The Permittee is only required to conduct visual inspections of runoff originating from, or passing through, areas of industrial activity and/or significant materials. Any runoff that does not contact industrial activity and/or significant materials (e.g. office buildings, employee parking lots, natural areas, etc) is not required to be inspected.

e. Preventive Maintenance (No additional requirements).

f. Spills and Leaks (No additional requirements).

g. Management of Runoff (No additional requirements).

h. Other Industry Specific Control Measures (No additional requirements).

6. SWPPP Requirements.

In addition to the requirements of Part IV, the Permittee shall also comply with the following:

a. Facility Map.

The Permittee shall identify where any of the following may be exposed to stormwater:

1. Access roads, rail cars, and tracks.

2. Areas where substances are transferred in bulk.

3. Operating machinery.

b. Inventory of Exposed Materials (No additional requirements).

c. Potential Pollutant Sources.

The Permittee shall describe the following sources that have potential pollutants associated with them:

1. Outdoor storage of salt, pallets, coal, drums, containers.

2. Access roads, rail cars, and tracks.

3. Areas where the transfer of substances in bulk occurs.

4. Areas where machinery operates.

d. Description of Stormwater Controls (No additional requirements).

7. Monitoring and Reporting Requirements

In accordance with the monitoring requirements of Parts V and VI, the Permittee shall monitor the applicable parameters in Table C-1, below:

Sector-Specific Benchmark Values and Effluent Limitations: Sector C - Chemical and Allied Products Manufacturing. Discharges may be subject to requirements for more than one sector or subsector.
Link to this table

Subsector Parameter Benchmark Values Effluent Limits
C1 Phosphate Subcategory of Agricultural Chemicals Phosphorus, Total (as P) Benchmark Monitoring Not Required 105 mg/L daily maximum
35 mg/L calendar month average
Fluoride, Total (as F) Benchmark Monitoring Not Required 75 mg/L daily maximum
25 mg/L calendar month average
C2 Agricultural Chemicals Lead, Total (as Pb) 0.164 mg/L 1 Effluent Monitoring Not Required
Iron, Total (as Fe) 1.0 mg/L Effluent Monitoring Not Required
Zinc, Total (as Zn) 0.234 mg/L 1 Effluent Monitoring Not Required
Solids, Total Suspended (TSS) 100 mg/L 2 Effluent Monitoring Not Required
Phosphorus, Total (as P) 1.0 mg/L Effluent Monitoring Not Required
C3 Industrial Inorganic Chemicals Aluminum, Total (as Al) 1.5 mg/L Effluent Monitoring Not Required
Iron, Total (as Fe) 1.0 mg/L Effluent Monitoring Not Required
Zinc, Total (as Zn) 0.234 mg/L 1 Effluent Monitoring Not Required
Solids, Total Suspended (TSS) 100 mg/L 2 Effluent Monitoring Not Required
C4 Soaps, Detergents, Cosmetics, Perfumes Zinc, Total (as Zn) 0.234 mg/L 1 Effluent Monitoring Not Required
Solids, Total Suspended (TSS) 100 mg/L 2
C5 Plastics, Synthetics, Resins Solids, Total Suspended (TSS) 100 mg/L 2 Effluent Monitoring Not Required
Zinc, Total (as Zn) 0.234 mg/L 1 Effluent Monitoring Not Required
BOD, Carbonaceous 05 Day (20 Deg C) 25 mg/L Effluent Monitoring Not Required
C6 Medicinal Chemicals and Botanical Products Solids, Total Suspended (TSS) 100 mg/L 2 Effluent Monitoring Not Required
C7 Ethanol Facilities Solids, Total Suspended (TSS) 100 mg/L 2 Effluent Monitoring Not Required
BOD, Carbonaceous 05 Day (20 Deg C) 25 mg/L Effluent Monitoring Not Required

1The benchmark values of some metals are influenced by water hardness. For these parameters, the Permittee may determine the hardness of the stormwater discharges to identify the applicable ‘hardness range’ for determining their benchmark value. See Table 4 of Appendix B for hardness dependent benchmark values in accordance with Minn. R. 7050.0222 and Minn. R. 7052.0100.
2If the Permittee is required to comply with Appendix A, part F.1, the benchmark value for Solids, Total Suspended (TSS) is 65 mg/L, instead of 100 mg/L.


8. Use of Infiltration Devices and/or Industrial Stormwater Ponds for Stormwater Treatment and Disposal

Sector C industrial facilities are authorized to use designed infiltration devices or industrial stormwater ponds for stormwater management.

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