Administrative Code

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Virginia Administrative Code
Title 9. Environment
Agency 5. State Air Pollution Control Board
Chapter 60. Hazardous Air Pollutant Sources

9VAC5-60-310. Definitions.

A. For the purpose of the Regulations for the Control and Abatement of Air Pollution and subsequent amendments or any orders issued by the board, the words or terms shall have the meanings given them in subsection C of this section.

B. As used in this article, all terms not defined here shall have the meanings given them in 9VAC5 Chapter 10 (9VAC5-10), unless otherwise required by context.

C. Terms defined.

"Best available control technology" means an emissions limitation (including a visible emissions standard) based on the maximum degree of reduction for each toxic pollutant which the board, on a case-by-case basis, taking into account energy, environmental, and economic impacts and other costs, determines is achievable for such source or modification through application of production processes or available methods, systems, and techniques, including fuel cleaning or treatment or innovative fuel combustion techniques for control of such pollutant. If the board determines that technological or economic limitations on the application of measurement methodology to a particular emissions unit would make the imposition of an emissions standard infeasible, a design, equipment, work practice, operational standard, or combination of them, may be prescribed instead to satisfy the requirement for the application of best available control technology. Such standard shall, to the degree possible, set forth the emissions reduction achievable by implementation of such design, equipment, work practice or operation, and shall provide for compliance by means which achieve equivalent results.

"Fugitive emissions" means those emissions that could not reasonably pass through a stack, chimney, vent, or other functionally equivalent opening.

"Pesticide" means the same as the definition given in § 3.1-249.27 of the Virginia Pesticide Control Act.

"Potential to emit" means an emission rate based on the maximum capacity of a stationary source to emit a toxic pollutant under its physical and operational design. Any physical or operational limitation on the capacity of the source to emit a toxic pollutant, including air pollution control equipment, and restrictions on hours of operation or on the type or amount of material combusted, stored, or processed, shall be treated as part of its design only if the limitation or its effect on emissions is state or federally enforceable. Fugitive emissions shall be included in determining a stationary source's potential to emit.

"Significant ambient air concentration" means the concentration of a toxic pollutant in the ambient air that if exceeded may have the potential to injure human health.

"Source category schedule for standards" means the schedule issued pursuant to § 112(e) of the federal Clean Air Act for promulgating MACT standards issued pursuant to § 112(d) of the federal Clean Air Act and published in the Federal Register at 67 FR 6521, February 12, 2002.

"Threshold limit value (TLV®)" means the maximum airborne concentration of a substance to which the American Conference of Governmental Industrial Hygienists (ACGIH) believes that nearly all workers may be repeatedly exposed day after day without adverse effects and which is published in the ACGIH Handbook (see 9VAC5-20-21). The TLV® is divided into three categories: TLV-Time-Weighted Average® (TLV-TWA®), TLV-Short-Term Exposure Limit® (TLV-STEL®), and TLV-Ceiling® (TLV-C®).

"TLV-TWA®" means the time-weighted average concentration for a normal eight-hour workday and a 40-hour workweek, to which nearly all workers may be repeatedly exposed, day after day, without adverse effect (as defined in the ACGIH Handbook).

"TLV-STEL®" means the concentration to which workers may be exposed continuously for a short period of time without suffering from irritation, chronic or irreversible tissue damage, or narcosis of sufficient degree to increase the likelihood of accidental injury, impair self-rescue or materially reduce work efficiency. The TLV-STEL supplements the TLV-TWA® where there are recognized acute effects from a substance whose toxic effects are primarily of a chronic nature.

"TLV-C®" means the concentration that should not be exceeded during any part of the working exposure.

"Toxic pollutant" means any air pollutant listed in § 112(b) of the federal Clean Air Act, as revised by 40 CFR 63.60, or any other air pollutant that the board determines, through adoption of regulation, to present a significant risk to public health. This term excludes asbestos, fine mineral fibers, radionuclides, and any glycol ether that does not have a TLV®.

Statutory Authority

§ 10.1-1308 of the Code of Virginia; §§ 110, 111, 123, 129, 171, 172, and 182 of the Clean Air Act; 40 CFR Parts 51 and 60.

Historical Notes

Derived from VR120-06-0101, eff. April 1, 1988; amended, Virginia Register Volume 12, Issue 3, eff. December 1, 1995; Volume 13, Issue 14, eff. May 1, 1997; Volume 14, Issue 11, eff. April 1, 1998; Volume 15, Issue 13, eff. April 14, 1999; Virginia Register Volume 16, Issue 14, eff. May 1, 2000; Volume 17, Issue 15, eff. June 1, 2001; Volume 18, Issue 7, eff. February 1, 2002; Volume 19, Issue 6, eff. February 1, 2003; Volume 20, Issue 16, eff. June 1, 2004; Volume 21, Issue 7, eff. January 12, 2005; Volume 22, Issue 4, eff. December 1, 2005; Volume 23, Issue 17, eff. June 1, 2007; Volume 24, Issue 5, eff. December 12, 2007; Volume 25, Issue 12, eff. March 18, 2009; Volume 26, Issue 8, eff. January 20, 2010; Volume 27, Issue 11, eff. March 2, 2011; Volume 28, Issue 10, eff. February 15, 2012; Volume 29, Issue 10, eff. February 13, 2013; Volume 30, Issue 10, eff. July 1, 2014; Volume 31, Issue 12, eff. March 11, 2015; Volume 32, Issue 10, eff. February 10, 2016; Volume 33, Issue 10, eff. February 22, 2017; Volume 34, Issue 11, eff. February 21, 2018; Volume 35, Issue 11, eff. February 20, 2019; Volume 36, Issue 12, eff. March 4, 2020; Volume 37, Issue 4, eff. November 11, 2020.

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