Unless specifically defined in Texas Health and Safety Code,
Chapter 382 (also known as the Texas Clean Air Act) or in the rules
of the commission, the terms used by the commission have the meanings
commonly ascribed to them in the field of air pollution control. In
addition to the terms which are defined by the Texas Clean Air Act,
the following terms, when used in this chapter, have the following
meanings, unless the context clearly indicates otherwise. Additional
definitions for terms used in this chapter are found in §3.2
and §101.1 of this title (relating to Definitions).
(1) Background--The ambient concentration of volatile
organic compounds in the air, determined at least one meter upwind
of the component to be monitored. Test Method 21 (40 Code of Federal
Regulations Part 60, Appendix A) shall be used to determine the background.
(2) Beaumont-Port Arthur area--Hardin, Jefferson, and
(3) Capture efficiency--The amount of volatile organic
compounds (VOC) collected by a capture system that is expressed as
a percentage derived from the weight per unit time of VOCs entering
a capture system and delivered to a control device divided by the
weight per unit time of total VOCs generated by a source of VOCs.
(4) Carbon adsorption system--A carbon adsorber with
an inlet and outlet for exhaust gases and a system to regenerate the
(5) Closed-vent system--A system that:
(A) is not open to the atmosphere;
(B) is composed of piping, ductwork, connections, and,
if necessary, flow-inducing devices; and
(C) transports gas or vapor from a piece or pieces
of equipment directly to a control device.
(6) Coaxial system--A type of system consisting of
a tube within a tube that requires only one tank opening. The tank
opening allows fuel to flow through the inner tube while vapors are
displaced through the annular space between the inner and outer tubes.
(7) Component--A piece of equipment, including, but
not limited to, pumps, valves, compressors, connectors, and pressure
relief valves, which has the potential to leak volatile organic compounds.
(8) Connector--A flanged, screwed, or other joined
fitting used to connect two pipe lines or a pipe line and a piece
of equipment. The term connector does not include joined fittings
welded completely around the circumference of the interface. A union
connecting two pipes is considered to be one connector.
(9) Continuous monitoring--Any monitoring device used
to comply with a continuous monitoring requirement of this chapter
will be considered continuous if it can be demonstrated that at least
95% of the required data is captured.
(10) Covered attainment counties--Anderson, Angelina,
Aransas, Atascosa, Austin, Bastrop, Bee, Bell, Bexar, Bosque, Bowie,
Brazos, Burleson, Caldwell, Calhoun, Camp, Cass, Cherokee, Colorado,
Comal, Cooke, Coryell, De Witt, Delta, Falls, Fannin, Fayette, Franklin,
Freestone, Goliad, Gonzales, Grayson, Gregg, Grimes, Guadalupe, Harrison,
Hays, Henderson, Hill, Hood, Hopkins, Houston, Hunt, Jackson, Jasper,
Karnes, Lamar, Lavaca, Lee, Leon, Limestone, Live Oak, Madison, Marion,
Matagorda, McLennan, Milam, Morris, Nacogdoches, Navarro, Newton,
Nueces, Panola, Polk, Rains, Red River, Refugio, Robertson, Rusk,
Sabine, San Augustine, San Jacinto, San Patricio, Shelby, Smith, Somervell,
Titus, Travis, Trinity, Tyler, Upshur, Van Zandt, Victoria, Walker,
Washington, Wharton, Williamson, Wilson, Wise, and Wood Counties.
Beginning January 1, 2017 this paragraph no longer applies to Wise
County. Upon the date the commission publishes notice in the Texas Register that the Wise County nonattainment
designation for the 2008 Eight-Hour Ozone National Ambient Air Quality
Standard is no longer legally effective, Wise County is included under
this definition of covered attainment counties as it was prior to
January 1, 2017.
(11) Dallas-Fort Worth area--As follows:
(A) Collin, Dallas, Denton, and Tarrant Counties for:
(i) Subchapter B, Division 5 of this chapter (relating
to Municipal Solid Waste Landfills);
(ii) Subchapter F, Division 3 of this chapter (relating
to Degassing of Storage Tanks, Transport Vessels, and Marine Vessels);
(iii) Subchapter F, Division 4 of this chapter (relating
to Petroleum Dry Cleaning Systems);
(B) Collin, Dallas, Denton, Ellis, Johnson, Kaufman,
Parker, Rockwall, and Tarrant Counties for:
(i) Subchapter B, Division 4 of this chapter (relating
to Industrial Wastewater);
(ii) Subchapter D, Division 1 of this chapter (relating
to Process Unit Turnaround and Vacuum-Producing Systems in Petroleum
(iii) Subchapter E, Division 3 of this chapter (relating
to Flexographic and Rotogravure Printing);
(iv) Subchapter F, Division 2 of this chapter (relating
to Pharmaceutical Manufacturing Facilities); and
(C) Collin, Dallas, Denton, Ellis, Johnson, Kaufman,
Parker, Rockwall, Tarrant, and Wise Counties for all other divisions
of this chapter. Upon the date the commission publishes notice in
the Texas Register that the Wise County
nonattainment designation for the 2008 Eight-Hour Ozone National Ambient
Air Quality Standard is no longer legally effective, Wise County is
no longer included in this definition of the Dallas-Fort Worth area.
(12) Dual-point vapor balance system--A type of vapor
balance system in which the storage tank is equipped with an entry
port for a gasoline fill pipe and a separate exit port for vapor connection.
(13) El Paso area--El Paso County.
(14) Emergency flare--A flare that only receives emissions
during an upset event.
(15) External floating roof--A cover or roof in an
open-top tank which rests upon or is floated upon the liquid being
contained and is equipped with a single or double seal to close the
space between the roof edge and tank shell. A double seal consists
of two complete and separate closure seals, one above the other, containing
an enclosed space between them. For the purposes of this chapter,
an external floating roof storage tank that is equipped with a self-supporting
fixed roof (typically a bolted aluminum geodesic dome) shall be considered
to be an internal floating roof storage tank.
(16) Fugitive emission--Any volatile organic compound
entering the atmosphere that could not reasonably pass through a stack,
chimney, vent, or other functionally equivalent opening designed to
direct or control its flow.
(17) Gasoline bulk plant--A gasoline loading and/or
unloading facility, excluding marine terminals, having a gasoline
throughput less than 20,000 gallons (75,708 liters) per day, averaged
over each consecutive 30-day period. A motor vehicle fuel dispensing
facility is not a gasoline bulk plant.
(18) Gasoline dispensing facility--A location that
dispenses gasoline to motor vehicles and includes retail, private,
and commercial outlets.
(19) Gasoline terminal--A gasoline loading and/or unloading
facility, excluding marine terminals, having a gasoline throughput
equal to or greater than 20,000 gallons (75,708 liters) per day, averaged
over each consecutive 30-day period.
(20) Heavy liquid--Volatile organic compounds that
have a true vapor pressure equal to or less than 0.044 pounds per
square inch absolute (0.3 kiloPascal) at 68 degrees Fahrenheit (20
(21) Highly-reactive volatile organic compound--As
(A) In Harris County, one or more of the following
volatile organic compounds (VOC): 1,3-butadiene; all isomers of butene
(e.g., isobutene (2-methylpropene or isobutylene), alpha-butylene
(ethylethylene), and beta-butylene (dimethylethylene, including both
cis- and trans-isomers)); ethylene; and propylene.
(B) In Brazoria, Chambers, Fort Bend, Galveston, Liberty,
Montgomery, and Waller Counties, one or more of the following VOC:
ethylene and propylene.
(22) Houston-Galveston or Houston-Galveston-Brazoria
area--Brazoria, Chambers, Fort Bend, Galveston, Harris, Liberty, Montgomery,
and Waller Counties.
(23) Incinerator--For the purposes of this chapter,
an enclosed control device that combusts or oxidizes volatile organic
compound gases or vapors.
(24) Internal floating cover or internal floating roof--A
cover or floating roof in a fixed roof tank that rests upon or is
floated upon the liquid being contained, and is equipped with a closure
seal or seals to close the space between the cover edge and tank shell.
For the purposes of this chapter, an external floating roof storage
tank that is equipped with a self-supporting fixed roof (typically
a bolted aluminum geodesic dome) is considered to be an internal floating
roof storage tank.
(25) Leak-free marine vessel--A marine vessel with
cargo tank closures (hatch covers, expansion domes, ullage openings,
butterworth covers, and gauging covers) that were inspected prior
to cargo transfer operations and all such closures were properly secured
such that no leaks of liquid or vapors can be detected by sight, sound,
or smell. Cargo tank closures must meet the applicable rules or regulations
of the marine vessel's classification society or flag state. Cargo
tank pressure/vacuum valves must be operating within the range specified
by the marine vessel's classification society or flag state and seated
when tank pressure is less than 80% of set point pressure such that
no vapor leaks can be detected by sight, sound, or smell. As an alternative,
a marine vessel operated at negative pressure is assumed to be leak-free
for the purpose of this standard.
(26) Light liquid--Volatile organic compounds that
have a true vapor pressure greater than 0.044 pounds per square inch
absolute (0.3 kiloPascal) at 68 degrees Fahrenheit (20 degrees Celsius),
and are a liquid at operating conditions.
(27) Liquefied petroleum gas--Any material that is
composed predominantly of any of the following hydrocarbons or mixtures
of hydrocarbons: propane, propylene, normal butane, isobutane, and
(28) Low-density polyethylene--A thermoplastic polymer
or copolymer comprised of at least 50% ethylene by weight and having
a density of 0.940 grams per cubic centimeter or less.
(29) Marine loading facility--The loading arm(s), pumps,
meters, shutoff valves, relief valves, and other piping and valves
that are part of a single system used to fill a marine vessel at a
single geographic site. Loading equipment that is physically separate
(i.e., does not share common piping, valves, and other loading equipment)
is considered to be a separate marine loading facility.
(30) Marine loading operation--The transfer of oil,
gasoline, or other volatile organic liquids at any affected marine
terminal, beginning with the connections made to a marine vessel and
ending with the disconnection from the marine vessel.
(31) Marine terminal--Any marine facility or structure
constructed to transfer oil, gasoline, or other volatile organic liquid
bulk cargo to or from a marine vessel. A marine terminal may include
one or more marine loading facilities.
(32) Metal-to-metal seal--A connection formed by a
swage ring that exerts an elastic, radial preload on narrow sealing
lands, plastically deforming the pipe being connected, and maintaining
sealing pressure indefinitely.
(33) Natural gas/gasoline processing--A process that
extracts condensate from gases obtained from natural gas production
and/or fractionates natural gas liquids into component products, such
as ethane, propane, butane, and natural gasoline. The following facilities
shall be included in this definition if, and only if, located on the
same property as a natural gas/gasoline processing operation previously
defined: compressor stations, dehydration units, sweetening units,
field treatment, underground storage, liquefied natural gas units,
and field gas gathering systems.
(34) Petroleum refinery--Any facility engaged in producing
gasoline, kerosene, distillate fuel oils, residual fuel oils, lubricants,
or other products through distillation of crude oil, or through the
redistillation, cracking, extraction, reforming, or other processing
of unfinished petroleum derivatives.
(35) Polymer or resin manufacturing process--A process
that produces any of the following polymers or resins: polyethylene,
polypropylene, polystyrene, and styrenebutadiene latex.
(36) Pressure relief valve or pressure-vacuum relief
valve--A safety device used to prevent operating pressures from exceeding
the maximum and minimum allowable working pressure of the process
equipment. A pressure relief valve or pressure-vacuum relief valve
is automatically actuated by the static pressure upstream of the valve
but does not include:
(A) a rupture disk; or
(B) a conservation vent or other device on an atmospheric
storage tank that is actuated either by a vacuum or a pressure of
no more than 2.5 pounds per square inch gauge.
(37) Printing line--An operation consisting of a series
of one or more printing processes and including associated drying
(38) Process drain--Any opening (including a covered
or controlled opening) that is installed or used to receive or convey
wastewater into the wastewater system.
(39) Process unit--The smallest set of process equipment
that can operate independently and includes all operations necessary
to achieve its process objective.