Section 327IAC15-6-4. Definitions

   In addition to the definitions contained in IC 13-11-2, 327 IAC 5, and 327 IAC 15-1-2, the following definitions apply throughout this rule:

(1) "Best management practices" or "BMPs" means any of the following measures to prevent or reduce the pollution of waters of the state:

(A) Schedules of activities.

(B) Prohibitions of practice.

(C) Treatment requirements.

(D) Operation and maintenance procedures.

(E) Use of containment facilities.

(F) Other management practices.

BMPs may be employed, for example, to control plant site run-off, spillage or leaks, sludge or waste disposal, or drainage from raw materials storage, resulting from regulated industrial activities.

(2) "Concentration" means the mass of any given material present in a unit volume of liquid. Unless otherwise indicated under this rule, concentration values must be expressed in milligrams per liter.

(3) "Deicing operations" means the use of urea, glycol, or other deicing substances to remove ice from aircraft or runways.

(4) "Drainage" means the flow patterns of storm water run-off.

(5) "Drainage area" means the surface area draining storm water run-off.

(6) "Facility" means a parcel of land or site, together with all buildings, equipment, structures, and other stationary items that are:

(A) located on a single site or on contiguous or adjacent sites; and

(B) owned or operated by:

(i) the same person; or

(ii) any person that controls, is controlled by, or is under common control with the same person.

(7) "Good housekeeping" means maintaining a clean work environment to reduce or eliminate the potential mobilization of pollutants by storm water.

(8) "Impervious surface" means any surface that prevents storm water from readily infiltrating into the soils.

(9) "Injection well" means any hole that is deeper than it is wide and through which fluids can enter the ground water. Injection wells are regulated under 40 CFR 145 and 40 CFR 144.

(10) "Material handling activity" means the storage, loading and unloading, transportation, or conveyance of any raw material, intermediate product, finished product, byproduct, or waste product.

(11) "Measurable storm event" means a precipitation event which results in a total measured precipitation accumulation equal to, or greater than, one-tenth (0.1) inch of rainfall.

(12) "Municipal separate storm sewer system" or "MS4" means a conveyance or system of conveyances, including roads with drainage systems, municipal streets, catch basins, curbs, gutters, ditches, manmade channels, or storm drains that is:

(A) owned or operated by a federal entity or state, city, town, borough, county, parish, district, association, or other public body (created by or pursuant to state law) having jurisdiction over storm water, including special districts under state law, such as a sewer district, flood control district or drainage district, or similar entity, or a designated and approved management agency under Section 208 of the Clean Water Act (33 U.S.C. 1288)* that discharges into waters of the state;

(B) designed or used for collecting or conveying storm water;

(C) not a combined sewer; and

(D) not part of a publicly owned treatment works (POTW) as defined in 40 CFR 122.2**.

(13) "No exposure" means a condition of a facility that exists when all industrial materials and activities are protected by a storm-resistant shelter to prevent exposure to precipitation or run-off.

(14) "Nonstructural control measure" means the use of nonphysical best management practices to reduce or eliminate mobilization of pollutants by storm water (for example, sweeping, inspections, training, and preventative maintenance).

(15) "Notice of termination letter" or "NOT letter" means a written notification indicating that facility has met the conditions to terminate its permit coverage under this rule.

(16) "Outfall" means the point of discharge from a point source.

(17) "Pervious surface" means a ground surface that readily allows storm water to infiltrate or percolate into the soils.

(18) "Qualified professional" means an individual who is trained and experienced in storm water treatment techniques and related fields as may be demonstrated by state registration, professional certification, experience, or completion of coursework that enable the individual to make sound, professional judgments regarding storm water control or treatment and monitoring, pollutant fate and transport, and drainage planning.

(19) "Qualified storm event" means a discharge resulting from a measurable storm event at least seventy-two (72) hours after the previous measurable storm event. The term does not include discharges of snowmelt.

(20) "Risk identification" means a non-statistical assessment to determine the potential for storm water to be exposed to pollutants and the facility's subsequent need for additional protection practices and measures.

(21) "Secondary containment structure" means a structure or a part of a structure that prevents or impedes a hazardous material that is released accidentally from entering surface water or ground water.

(22) "Storm water discharge" means the release or flow of storm water from a point source, which enters a water of the state.

(23) "Storm water discharge exposed to industrial activity" means storm water discharge that has been exposed to the manufacturing and processing activities, or raw materials or intermediate products storage areas at an industrial facility. For the categories of industries identified in section 2(a)(5) of this rule, the term includes the following:

(A) Storm water discharges from industrial plant yards.

(B) Immediate access roads and rail lines used or traveled by carriers of raw materials, manufactured products, waste material, or byproducts used or created by the facility.

(C) Material handling sites.

(D) Refuse sites.

(E) Sites used for the application or disposal of process wastewaters (as defined in 40 CFR 401).

(F) Sites used for the storage and maintenance of material handling equipment.

(G) Sites used for residual treatment, storage, or disposal.

(H) Shipping and receiving areas.

(I) Manufacturing buildings.

(J) Storage areas (including tank farms) for raw materials and intermediate and finished products.

(K) Areas where industrial activity has taken place in the past and significant materials remain and are exposed to storm water.

(24) "Storm water pollution prevention plan" or "SWP3" means a written document that addresses storm water run-off pollution prevention for a specific industrial facility.

(25) "Structural control measure" means a physical structure designed to reduce or eliminate the mobilization of pollutants by storm water, for example, detention structures, berming, and vegetated swales.

  *Copies of Section 208 of the Clean Water Act (33 U.S.C. 1288) referenced in this section may be obtained from the Government Printing Office, Washington, D.C. 20402 or the Indiana Department of Environmental Management, Office of Water Quality, Indiana Government Center North, 100 North Senate Avenue, Room N1255, Indianapolis, Indiana 46204.

  **Copies of the Code of Federal Regulations (CFR) 40 CFR 122.2 referenced in this section may be obtained from the Government Printing Office, Washington, D.C. 20402 or the Indiana Department of Environmental Management, Office of Water Quality, Indiana Government Center North, 100 North Senate Avenue, Room N1255, Indianapolis, Indiana 46204. (Water Pollution Control Division; 327 IAC 15-6-4; filed Aug 31, 1992, 5:00 p.m.: 16 IR 27; errata filed Sep 10, 1992, 12:00 p.m.: 16 IR 65; errata, 16 IR 751; readopted filed Jan 10, 2001, 3:23 p.m.: 24 IR 1518; filed Oct 27, 2003, 10:15 a.m.: 27 IR 848; errata filed Feb 4, 2004, 1:45 p.m.: 27 IR 2284; errata filed Feb 6, 2006, 11:15 a.m.: 29 IR 1938; readopted filed Nov 21, 2007, 1:16 p.m.: 20071219-IR-327070553BFA; readopted filed Jul 29, 2013, 9:21 a.m.: 20130828-IR-327130176BFA; filed Oct 9, 2015, 4:07 p.m.: 20151104-IR-327100659FRA)