Section 326IAC8-20-2. Definitions

   The following definitions apply throughout this rule:

(1) "Affected residual" means a residual that is removed from an affected VOC wastewater stream.

(2) "Affected VOC" means VOC with a Henry's Law Constant greater than or equal to 1.8 × 10^-6 atm-m3/mole (0.1y/x) at twenty-five (25) degrees Celsius.

(3) "Affected VOC wastewater stream" means the following:

(A) A process wastewater stream from a process unit at an affected industrial category with either an annual average concentration of affected VOC greater than or equal to:

(i) ten thousand (10,000) parts per million by weight (ppmw); or

(ii) one thousand (1,000) ppmw and an annual average flow rate greater than or equal to ten and zero-tenths (10.0) liters per minute (two and sixty-four hundredths (2.64) gallons per minute), as determined in accordance with section 9 of this rule.

(B) The term does not include the following:

(i) Maintenance wastewaters.

(ii) Stormwater from segregated sewers.

(iii) Water from firefighting and deluge systems.

(iv) Spills.

(v) Water from safety showers.

(vi) Samples of a size not greater than reasonably necessary for the method of analysis that is used.

(vii) Equipment leaks.

(viii) Wastewater drips from procedures such as disconnecting hoses after cleaning lines.

(ix) Noncontact cooling water.

(4) "Annual average concentration" means the flow-weighted annual average concentration, as determined according to the procedures specified in 40 CFR 60.782(b)*.

(5) "Annual average flow rate" means the annual average flow rate, as determined according to the procedures specified in section 9 of this rule.

(6) "Closed biological treatment process" means a tank or surface impoundment where biological treatment occurs and VOC emissions from the treatment process are routed either to a control device by means of a closed vent system or to a fuel gas system by means of hard-piping. The tank or surface impoundment has a fixed roof, as defined in this rule, or a floating flexible membrane cover that meets the requirements specified in section 9 of this rule.

(7) "Closed-vent system" means a system that:

(A) is not open to the atmosphere; and

(B) is composed of:

(i) hard-piping;

(ii) ductwork;

(iii) connections; and

(iv) if necessary, flow inducing devices that transport gas or vapor from an emission point to a control device.

(8) "Combustion device" means an individual unit of equipment, such as a:

(A) flare;

(B) incinerator;

(C) process heater; or

(D) boiler;

used for the combustion of VOC emissions.

(9) "Continuously monitor and record" means to measure data values of a parameter at least once every fifteen (15) minutes and to record either each measured data value or block average values for a fifteen (15) minute or shorter time period. A block average value is the average of all measured data values during the time period or, if data values are measured more frequently than once per minute, the average of measured data values taken at least once per minute during the time period.

(10) "Continuous seal" means a seal that forms a continuous closure that completely covers the space between the wall of the storage vessel and the edge of the floating roof. A continuous seal may be a:

(A) vapor-mounted seal;

(B) liquid-mounted seal; or

(C) metallic shoe seal.

A continuous seal may be constructed of fastened segments so as to form a continuous seal.

(11) "Control device" means any of the following:

(A) Combustion device.

(B) Recovery device for vapor vents.

(C) Recapture device.

Such equipment includes, but is not limited to, absorbers, carbon adsorbers, condensers, incinerators, flares, boilers, and process heaters. For a steam stripper, a primary condenser is not considered a control device.

(12) "Cover" means the following:

(A) A device or system that is placed on or over a waste management unit containing wastewater or residuals so that the entire surface area is enclosed to minimize air VOC emissions.

(B) A cover may have openings necessary for operation, inspection, and maintenance of the waste management unit, such as:

(i) access hatches;

(ii) sampling ports; and

(iii) gauge wells;

provided that each opening is closed when not in use.

(C) The following are examples of covers:

(i) A fixed roof installed on a wastewater tank.

(ii) A lid installed on a container.

(iii) An air-supported enclosure installed over a waste management unit.

(13) "Ductwork" means a conveyance system such as those commonly used for heating and ventilation systems. It often:

(A) is made of sheet metal; and

(B) has sections connected by screws or crimping.

Hard-piping is not ductwork.

(14) "Enhanced biological treatment process" means the following:

(A) An aerated, thoroughly mixed treatment unit or units that contains biomass suspended in water followed by a clarifier that removes biomass from the treated water and recycles recovered biomass to the aeration unit.

(B) The mixed liquor volatile suspended solids (biomass) is greater than one (1) kilogram per cubic meter throughout each aeration unit. The biomass is suspended and aerated in the water of the aeration unit or units by either submerged air flow or mechanical agitation.

(C) A thoroughly mixed treatment unit is a unit that is designed and operated to approach or achieve uniform biomass distribution and organic compound concentration throughout the aeration unit by quickly dispersing the recycled biomass and the wastewater entering the unit.

(15) "External floating roof" means a pontoon-type or double-deck-type cover that rests on the liquid surface in a storage vessel or waste management unit with no fixed roof.

(16) "Fixed roof" means a cover that:

(A) is mounted on a waste management unit or storage vessel in a stationary manner; and

(B) does not move with fluctuations in liquid level.

(17) "Floating roof" means a cover:

(A) consisting of a:

(i) double deck;

(ii) pontoon single deck;

(iii) internal floating cover; or

(iv) covered floating roof;

that rests upon and is supported by the liquid being contained; and

(B) that is equipped with a closure seal or seals to close the space between the roof edge and waste management unit.

(18) "Fr" means fraction removed value for VOC, unitless.

(19) "Fuel gas system" means the off-site and on-site piping and control system that gathers gaseous stream or streams generated by on-site operations, may blend them with other sources of gas, and transports the gaseous stream for use as fuel gas in combustion devices or in in-process combustion equipment, such as furnaces and gas turbines, either singly or in combination.

(20) "Hard-piping" means pipe or tubing.

(21) "Incinerator" means an enclosed combustion device that is used for destroying organic compounds. Auxiliary fuel may be used to heat waste gas to combustion temperatures. Any energy recovery section present is not physically formed into one (1) manufactured or assembled unit with the combustion section; rather, the energy recovery section is a separate section following the combustion section and the two are joined by ducts or connections carrying flue gas. The energy recovery section limitation does not apply to an energy recovery section used solely to preheat the incoming vent stream or combustion air.

(22) "Individual drain system" means the stationary system used to convey wastewater streams or residuals to a waste management unit or to discharge or disposal. The term includes:

(A) hard-piping;

(B) all process drains and junction boxes, together with their associated sewer lines and other junction boxes;

(C) manholes;

(D) sumps and lift stations;

(E) conveying wastewater streams; or

(F) residuals.

The term does not include a segregated storm water sewer system, which is a drain and collection system designed and operated for the sole purpose of collecting rainfall-runoff at a source, and which is segregated from all other individual drain systems.

(23) "Internal floating roof" means a cover that rests or floats on the liquid surface, but not necessarily in complete contact with it, inside a waste management unit that has a fixed roof.

(24) "Junction box" means a manhole or a lift station or access point to a wastewater sewer line.

(25) "Liquid-mounted seal" means a foam or liquid-filled seal mounted in contact with the liquid between the wall of the storage vessel or waste management unit and the floating roof. The seal is mounted continuously around the circumference of the vessel or unit.

(26) "Maintenance wastewater" means wastewater generated by the draining of process fluid from components in the process unit into an individual drain system prior to or during maintenance activities. Maintenance wastewater can be generated during planned and unplanned shutdowns and during periods not associated with a shutdown. Any generation of wastewater that is routine or is generated by designed manufacturing processes is not maintenance wastewater. Examples of activities that can generate maintenance wastewaters include the following:

(A) Descaling heat exchanger tubing bundles.

(B) Cleaning of distillation column traps.

(C) Draining of low legs and high point bleeds.

(D) Draining of pumps into an individual drain system.

(E) Draining of portions of the process unit for repair.

(27) "Mechanical shoe seal" or "metallic shoe seal" means metal sheets that are held vertically against the wall of the storage vessel by:

(A) springs;

(B) weighted levers; or

(C) other mechanisms;

and connected to the floating roof by braces or other means. A flexible coated fabric (envelope) spans the annular space between the metal sheet and the floating roof.

(28) "Oil-water separator" or "organic-water separator" means the following:

(A) A waste management unit used to separate oil or organics from water.

(B) An oil-water or organic-water separator consists of not only the separation unit but also the forebay and other separator basins:

(i) skimmers;

(ii) weirs;

(iii) grit chambers; and

(iv) sludge hoppers;

and bar screens that are located directly after the individual drain system and prior to additional treatment units such as an air flotation unit clarifier, or biological treatment unit.

(C) Examples of an oil-water or organic-water separator include, but are not limited to:

(i) an American Petroleum Institute separator;

(ii) a parallel-plate interceptor; or

(iii) a corrugated-plate interceptor with the associated ancillary equipment.

(29) "Open biological treatment process" means a biological treatment process that is not a closed biological treatment process as defined in this rule.

(30) "Point of determination" means each point where process wastewater exits a process unit.

(31) "Point of generation" means the location where process wastewater exits a process unit.

(32) "Pressure relief valve" means a valve used only to release an unplanned, nonroutine discharge. A relief valve discharge can result from:

(A) an operator error;

(B) a malfunction, such as a power failure or equipment failure; or

(C) another unexpected cause;

that requires immediate venting of gas from process equipment in order to avoid safety hazards or equipment damage.

(33) "Process drain" means any opening (including a covered or controlled opening) that is installed or used to receive or convey wastewater into the wastewater system.

(34) "Process unit" means the smallest set of process equipment that:

(A) can operate independently; and

(B) includes all operations necessary to achieve its process objective.

(35) "Process wastewater" means the following:

(A) Wastewater that during manufacturing or processing comes into direct contact with or results from the production or use of any:

(i) raw material;

(ii) intermediate product;

(iii) finished product;

(iv) byproduct; or

(v) waste product.

(B) The term includes, but is not limited to, the following:

(i) Product tank drawdown or feed tank drawdown.

(ii) Water formed during a chemical reaction or used as a reactant.

(iii) Water used to wash impurities from organic products or reactants.

(iv) Water used to cool or quench organic vapor streams through direct contact.

(v) Condensed steam from jet ejector systems pulling vacuum on vessels containing organics.

(36) "RCRA" means the Resource Conservation and Recovery Act.

(37) "Recapture device" means the following:

(A) An individual unit of equipment capable of and used for the purpose of recovering chemicals, but not normally for use, reuse, or sale. For example, a recapture device may recover chemicals primarily for disposal.

(B) Recapture devices include, but are not limited to, the following:

(i) Absorbers.

(ii) Carbon adsorbers.

(iii) Condensers.

(38) "Recovery device" means the following:

(A) An individual unit of equipment capable of and normally used for the purpose of recovering chemicals for fuel value (for example, net positive heating value), use, reuse, or for sale for fuel value, use, or reuse.

(B) Examples of equipment that may be recovery devices include the following:

(i) Absorbers.

(ii) Carbon adsorbers.

(iii) Condensers.

(iv) Oil-water separators or organic-water separators.

(v) Organic removal devices, such as the following:

(AA) Decanters.

(BB) Strippers.

(CC) Thin-film evaporation units.

(C) For purposes of the monitoring, record keeping, and reporting requirements of this rule, recapture devices are considered recovery devices.

(39) "Residual" means the following:

(A) Any liquid or solid material containing VOC that is removed from a wastewater stream by a waste management unit or treatment process that does not destroy organic compounds (nondestructive unit).

(B) Examples of residuals from nondestructive wastewater management units are the following:

(i) The organic layer and bottom residue removed by a decanter or organic-water separator.

(ii) The overheads from a steam stripper or air stripper.

(C) Examples of materials that are not residuals are:

(i) silt;

(ii) mud;

(iii) leaves;

(iv) bottoms from a steam stripper or air stripper; and

(v) sludges, ash, or other materials;

removed from wastewater being treated by destructive devices such as biological treatment units and incinerators.

(40) "Sewer line" means a lateral, trunk line, branch line, or other conduit including, but not limited to, grates and trenches, used to convey wastewater streams or residuals to a downstream waste management unit.

(41) "Single-seal system" means a floating roof having one (1) continuous seal that completely covers the space between the wall of the storage vessel and the edge of the floating roof. The seal may be a vapor-mounted, liquid-mounted, or metallic shoe seal.

(42) "Steam jet ejector" means a steam nozzle that discharges a high-velocity jet across a suction chamber that is connected to the equipment to be evacuated.

(43) "Steam stripper" means a column including:

(A) associated stripper feed tanks;

(B) condensers; or

(C) heat exchangers;

used to remove compounds from wastewater.

(44) "Surface impoundment" means the following:

(A) A waste management unit that is a:

(i) natural topographic depression;

(ii) man-made excavation; or

(iii) diked area formed primarily of earthen materials (although it may be lined with man-made materials);

designed to hold an accumulation of liquid wastes or waste containing free liquids.

(B) A surface impoundment is used for the purpose of treating, storing, or disposing of wastewater or residuals and is not an injection well.

(C) Examples of surface impoundments are the following:

(i) Equalization.

(ii) Settling and aeration pits.

(iii) Ponds.

(iv) Lagoons.

(45) "Tank drawdown" means any material or mixture of materials discharged from a product tank, feed tank, or intermediate tank for the purpose of removing water or other contaminants from the tank.

(46) "Temperature monitoring device" means a unit of equipment used to monitor temperature and having a minimum accuracy of:

(A) plus or minus one percent (1%) of the temperature being monitored expressed in degrees Celsius; or

(B) plus or minus five-tenths (0.5) degree Celsius;

whichever number is greater, for example, has the highest absolute value.

(47) "Treatment process" means a specific technique that removes or destroys the organics in a wastewater or residual stream, such as:

(A) a steam stripping unit (steam stripper);

(B) a thin-film evaporation unit;

(C) a waste incinerator;

(D) a biological treatment unit; or

(E) any other process applied to wastewater streams or residuals;

to comply with section 4(h) or 5 of this rule. Most treatment processes are conducted in tanks. Treatment processes are a subset of waste management units.

(48) "Vapor-mounted seal" means a continuous seal that:

(A) completely covers the annular space between the wall of the storage vessel or waste management unit and the edge of the floating roof; and

(B) is mounted such that there is a vapor space between the stored liquid and the bottom of the seal.

(49) "Waste management unit" means the following:

(A) Equipment, a structure or structures, or a device or devices used to convey, store, treat, or dispose of wastewater streams or residuals.

(B) Examples of waste management units include the following:

(i) Wastewater tanks.

(ii) Surface impoundments.

(iii) Individual drain systems.

(iv) Biological wastewater treatment units.

(C) Examples of equipment that may be waste management units include the following:

(i) Containers.

(ii) Air flotation units.

(iii) Oil-water separators or organic-waste separators.

(iv) Organic removal devices such as:

(AA) decanters;

(BB) strippers; or

(CC) thin-film evaporation units.

(D) If such equipment is used for recovery, then it is part of a process unit and is not a waste management unit.

(50) "Wastewater stream" means a stream that contains process wastewater.

(51) "Wastewater tank" means a stationary waste management unit that is:

(A) designed to contain an accumulation of wastewater or residuals; and

(B) constructed primarily of nonearthen materials, for example, wood, concrete, steel, or plastic, that provide structural support.

The term includes wastewater tanks used for flow equalization.

(52) "Water seal controls" means:

(A) a seal pot;

(B) a p-leg trap; or

(C) another type of trap filled with water;

for example, flooded sewers that maintain water levels adequate to prevent air flow through the system, that creates a water barrier between the water level of the seal and the atmosphere. The water level of the seal must be maintained in the vertical leg of a drain in order to be considered a water seal.

(53) "Wet weather retention basin" means an impoundment or tank that is used to store rainfall runoff that would exceed the capacity of the wastewater treatment system until it can be returned to the wastewater treatment system or, if the water meets the applicable discharge limits, discharged without treatment. These units may also be used to store wastewater during periods when the wastewater treatment system is shut down for maintenance or emergencies.

  *These documents are 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. (Air Pollution Control Division; 326 IAC 8-20-2; filed Nov 3, 2009, 3:32 p.m.: 20091202-IR-326090222FRA; errata filed Nov 19, 2009, 10:03 a.m.: 20091216-IR-326090222ACA)