Indiana Administrative Code
Title 326 - AIR POLLUTION CONTROL DIVISION
Article 20 - HAZARDOUS AIR POLLUTANTS
Rule 13.1 - Secondary Lead Smelters
Section 13.1-2 - Definitions

(1) "Affected emission unit" means any of the following emission units at a secondary lead smelter:

(2) "Affirmative defense" means, in the context of an enforcement proceeding, a response or defense put forward by a defendant, regarding which the defendant has the burden of proof, and the merits of which are independently and objectively evaluated in a judicial or administrative proceeding.

(3) "Agglomerating furnace" means a furnace used to melt flue dust that is collected from a baghouse into a solid mass.

(4) "Bag leak detection system" means an instrument that is capable of monitoring particulate matter loadings in the exhaust of a baghouse in order to detect bag failures. A bag leak detection system includes, but is not limited to, an instrument to monitor relative particulate matter loadings that operates on:

(5) "Battery breaking area" means the plant location at which lead-acid batteries are broken, crushed, or disassembled and separated into components.

(6) "Blast furnace" means a smelting furnace consisting of a vertical cylinder atop a crucible, into which lead-bearing charge materials are introduced at the top of the furnace and combustion air is introduced through openings in the refractory lining and shell of the furnace at the bottom of the cylinder and that:

(7) "Blast furnace charging location" means the physical opening through which raw materials are introduced into a blast furnace.

(8) "Collocated blast furnace and reverberatory furnace" means operation at the same location of a blast furnace and a reverberatory furnace where the vent streams of the furnaces are mixed before cooling, with the volumetric flow rate discharged from the blast furnace being equal to or less than that discharged from the reverberatory furnace.

(9) "Dryer" means a chamber that is heated and that is used to remove moisture from lead bearing materials before they are charged to a smelting furnace.

(10) "Dryer transition equipment" means the junction between a dryer and the charge hopper or conveyor, or the junction between the dryer and the smelting furnace feed chute or hopper located at the ends of the dryer.

(11) "Electric furnace" means a smelting furnace consisting of a vessel into which reverberatory furnace slag is introduced and that uses electrical energy to heat the reverberatory furnace slag to a temperature of greater than nine hundred eighty (980) degrees Celsius so that lead compounds are reduced to elemental lead metal.

(12) "Fugitive dust source" means a stationary source of hazardous air pollutant emissions at a secondary lead smelter that is not associated with a specific process or process fugitive vent or stack. Fugitive dust sources include, but are not limited to, the following:

(13) "Furnace and refining/casting area" means any area of a secondary lead smelter where:

(14) "Lead alloy" means an alloy in which the predominant component is lead.

(15) "Lead-bearing material" means material with a lead content equal to or greater than five (5) milligrams per liter (mg/l) as measured by United States Environmental Protection Agency (U.S. EPA) Method 1311 "Test Methods for Evaluating Solid Waste, Physical/Chemical Method", U.S. EPA Publication SW-846*. Under Method 1311, only materials with at least one hundred (100) parts per million (ppm) lead will be considered to be lead-bearing.

(16) "Leeward wall" means the furthest exterior wall of a total enclosure that is opposite the windward wall.

(17) "Maintenance activity" means any of the following routine maintenance and repair activities that could generate fugitive lead dust:

(18) "Materials storage and handling area" means any area of a secondary lead smelter where lead-bearing materials are stored or handled between process steps including, but not limited to areas in which materials are stored in open piles, bins, or tubs, and areas in which material is prepared for charging to a smelting furnace. Lead-bearing materials in these areas include, but are not limited to, the following:

(19) "Natural draft opening" means any permanent opening in an enclosure that:

(20) "New emissions unit" means any affected emissions unit at a secondary lead smelter that was constructed or reconstructed after May 19, 2011. The term does not include a building that is constructed for the purpose of controlling fugitive emissions from an existing emissions unit.

(21) "Partial enclosure" means a structure comprised of walls or partitions on at least three (3) sides or three-quarters (3/4) of the perimeter surrounding stored materials or process equipment to prevent the entrainment of particulate matter into the air.

(22) "Pavement cleaning" means the use of vacuum equipment, water sprays, or a combination thereof to remove dust or other accumulated material from the paved areas of a secondary lead smelter.

(23) "Plant roadway" means any area of a secondary lead smelter outside of a total enclosure that is subject to vehicle traffic, including traffic by forklifts, front-end loaders, or vehicles carrying whole batteries or cast lead ingots. The term does not include employee and visitor parking areas, provided they are not subject to traffic by vehicles carrying lead-bearing materials.

(24) "Pressurized dryer breaching seal" means a seal system connecting the dryer transition pieces that is maintained at a higher pressure than the inside of the dryer.

(25) "Process fugitive emissions source" means a source of hazardous air pollutant emissions at a secondary lead smelter that is associated with lead smelting or refining, but is not the primary exhaust stream from a smelting furnace, and is not a fugitive dust source. Process fugitive emissions sources include, but are not limited to, the following:

(26) "Process vent" means the following:

(27) "Refining kettle" means an open-top vessel that is constructed of cast iron or steel and is indirectly heated from below and contains molten lead for the purpose of refining and alloying the lead, including the following:

(28) "Reverberatory furnace" means a refractory-lined furnace that uses one (1) or more flames to heat the walls and roof of the furnace and lead-bearing scrap to a temperature of greater than nine hundred eighty (980) degrees Celsius so that lead compounds are chemically reduced to elemental lead metal.

(29) "Rotary furnace," or "rotary reverberatory furnace" means a furnace consisting of a refractory-lined chamber that rotates about a horizontal axis and that uses one (1) or more flames to heat the walls of the furnace and lead-bearing scrap to a temperature of greater than nine hundred eighty (980) degrees Celsius so that lead compounds are chemically reduced to elemental lead metal.

(30) "Secondary lead smelter" means any source where lead-bearing scrap material is recycled into elemental lead or lead alloys by smelting, including, but not limited to, lead-acid batteries.

(31) "Shutdown" means the period when no lead-bearing materials are being fed to the furnace and smelting operations have ceased during which the furnace is cooled from steady-state operating temperature to ambient temperature.

(32) "Smelting" means the chemical reduction of lead compounds to elemental lead or lead alloys through processing in high-temperature furnaces at a temperature of greater than nine hundred eighty (980) degrees Celsius, including, but not limited to, the following:

(33) "Startup" means the period when no lead-bearing materials have been fed to the furnace and smelting operations have not yet commenced during which the furnace is heated from ambient temperature to steady-state operating temperature.

(34) "Total enclosure" means a containment building that is completely enclosed with a floor, walls, and a roof to prevent exposure to the elements and to assure containment of lead-bearing material with limited openings to allow access and egress for people and vehicles. The total enclosure must provide an effective barrier against fugitive dust emissions so that the:

(35) "Vehicle wash" means a device for removing dust and other accumulated material from the wheels, body, and underside of a vehicle to prevent the inadvertent transfer of lead-contaminated material to another area of a secondary lead smelter or to public roadways.

(36) "Wet suppression" means the use of water, water combined with a chemical surfactant, or a chemical binding agent to prevent the entrainment of dust into the air from fugitive dust sources.

(37) "Windward wall" means the exterior wall of a total enclosure that is most impacted by the wind in its most prevailing direction determined by a wind rose using available data from the closest representative meteorological station.

*This document is incorporated by reference. Copies may be obtained from the Government Printing Office, 732 North Capitol Street NW, Washington, D.C. 20401 or are available for review and copying at the Indiana Department of Environmental Management, Office of Air Quality, Indiana Government Center North, Tenth Floor, 100 North Senate Avenue, Indianapolis, Indiana 46204.