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Storm water that is exposed to industrial activity will require permit coverage based on the criteria in this section. However, industrial facilities meeting these criteria may also be eligible for an exclusion from permit coverage. Potential exclusions include: No Exposure of all Facility Activities Exposed to Storm Water, Discharge to a Combined Sewer System, or Storm Water does not have the Potential to Impact a Water of the State.

327 IAC 15-6 (Rule 6) (Select Rule 6, Storm Water Discharges Exposed to Industrial Activity from the index or Scroll to page 23) applies to all facilities described by one or more of the Standard Industrial Classification (SIC) Codes and/or meet specific activity categories; storm water that is exposed to industrial activity; and is discharged through a point source to waters of the state.

Industrial facilities generally are classified by Standard Industrial Classification (SIC) Code. This code is a four-digit number that corresponds to the type of industrial activity at a facility, and can be determined, on-line, from OSHA. Facilities currently using the North American Industry Classification System (NAICS) can find conversion tables into SIC Code online. Several of the SIC Codes and some additional non-classified industrial activity categories are subject to Rule 6. The following table describes the industrial SIC Code categories subject to Rule 6:

Regulated Industrial Activity Categories
SIC Code *Activity Description
10xxMetal mining
13xxOil and gas extraction
14xxNonmetallic minerals, except fuels
20xxFood and kindred products
21xxTobacco products
22xxTextile mill products
23xxApparel and other textile products
24xxLumber and wood products
25xxFurniture and fixtures
26xxPaper and allied products
27xxPrinting and publishing
28xxChemicals and allied products
29xxPetroleum and coal products
30xxRubber and miscellaneous plastic products
31xxLeather and leather products
32xxStone, clay, and glass products
33xxPrimary metal industries
34xxFabricated metal products
35xxIndustrial machinery and equipment
36xxElectronic and other electric equipment
37xxTransportation equipment
38xxInstruments and related products
39xxMiscellaneous manufacturing industries
40xxRailroad transportation
41xxLocal and interurban passenger transit
42xxTrucking and warehousing
43xxUnited States Postal Service
44xxWater transportation
45xxTransportation by air
5015Motor vehicle parts, used
5093Scrap and waste materials
5541Gasoline service stations **

* Although the actual SIC Code is a four-digit number, Rule 6 regulates the primary category group (i.e., the first two digits of the SIC Code) in many cases.

** Only gasoline service stations that act as truck stops or plazas and have on-site vehicle maintenance activities are potentially regulated under Rule 6.

In addition to SIC Code designation, several narrative categories of industrial activities are also potentially regulated under Rule 6. These narrative categories include:

  1. hazardous waste treatment, storage, or disposal facilities;
  2. landfills, land application sites, open dumps, and transfer stations;
  3. steam electric power generating facilities;
  4. wastewater treatment plants with a design flow of 1,000,000 gallons per day or more; and
  5. agricultural chemical fertilizer and pesticide distribution facilities.

If it is determined that a facility meets the applicability requirements of the Rule, the Responsible Individual is required to obtain a General Permit. The procedure for obtaining this permit is outlined in Step-by-Step Process for Compliance with 327 IAC 15-6.

For more information regarding the applicability requirements for 327 IAC 15-6, please contact the Storm Water Permit Coordinator.

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