South Carolina Code of Regulations › Chapter 61 - DEPARTMENT OF HEALTH AND ENVIRONMENTAL CONTROL › Subchapter 61-62 - Air Pollution Control Regulations and Standards › Subchapter 61-62.68 - Chemical Accident Prevention Provisions › Subpart F - REGULATED SUBSTANCES FOR ACCIDENTAL RELEASE PREVENTION › Section 61-62.68.F.115 - Threshold determination

Current through Register Vol. 48, No. 6, June 28, 2024
(a) A
				  threshold quantity of a regulated substance listed in Section 68.130 is present
				  at a stationary source if the total quantity of the regulated substance
				  contained in a process exceeds the threshold.
(b) For the purposes of determining whether
				  more than a threshold quantity of a regulated substance is present at the
				  stationary source, the following exemptions apply:
(1) Concentrations of a regulated toxic
				  substance in a mixture. If a regulated substance is present in a mixture and
				  the concentration of the substance is below one percent by weight of the
				  mixture, the amount of the substance in the mixture need not be considered when
				  determining whether more than a threshold quantity is present at the stationary
				  source. Except for oleum, toluene 2,4-diisocyanate, toluene 2,6-diisocyanate,
				  and toluene diisocyanate (unspecified isomer), if the concentration of the
				  regulated substance in the mixture is one percent or greater by weight, but the
				  owner or operator can demonstrate that the partial pressure of the regulated
				  substance in the mixture (solution) under handling or storage conditions in any
				  portion of the process is less than 10 millimeters of mercury (mm Hg), the
				  amount of the substance in the mixture in that portion of the process need not
				  be considered when determining whether more than a threshold quantity is
				  present at the stationary source. The owner or operator shall document this
				  partial pressure measurement or estimate.
(2) Concentrations of a regulated flammable
				  substance in a mixture.
(i) General
				  provision. If a regulated substance is present in a mixture and the
				  concentration of the substance is below one percent by weight of the mixture,
				  the mixture need not be considered when determining whether more than a
				  threshold quantity of the regulated substance is present at the stationary
				  source. Except as provided in paragraph (b)(2)(ii) and (b)(2)(iii) of this
				  section, if the concentration of the substance is one percent or greater by
				  weight of the mixture, then, for purposes of determining whether a threshold
				  quantity is present at the stationary source, the entire weight of the mixture
				  shall be treated as the regulated substance unless the owner or operator can
				  demonstrate that the mixture itself does not have a National Fire Protection
				  Association flammability hazard rating of 4. The demonstration shall be in
				  accordance with the definition of flammability hazard rating 4 in the NFPA 704,
				  Standard System for the Identification of the Hazards of Materials for
				  Emergency Response, National Fire Protection Association, Quincy, MA,
				  1996.Available from the National Fire Protection Association, 1 Batterymarch
				  Park, Quincy, MA 02269-9101. This incorporation by reference was approved by
				  the Director of the Federal Register in accordance with
				  5
				  U.S.C. 552(a) and 1 CFR Part
				  51. Copies may be inspected at the Environmental Protection Agency Air Docket
				  (6102), Attn: Docket No. A-96-O8, Waterside Mall, 401 M. St. SW., Washington
				  DC; or at the National Archives and Records Administration (NARA). For
				  information on the availability of this material at NARA, call 202-741-6030, or
				  go to:
http://www.archives.gov/federal__register/code__of__federal__regulations/ibr__locations.html
.
				  Boiling point and flash point shall be defined and determined in accordance
				  with NFPA 30, Flammable and Combustible Liquids Code, National Fire Protection
				  Association, Quincy, MA, 1996. Available from the National Fire Protection
				  Association, 1 Batterymarch Park, Quincy, MA 02269-9101. This incorporation by
				  reference was approved by the Director of the Federal Register in accordance
				  with
				  5
				  U.S.C. 552(a) and 1 CFR Part
				  51. Copies may be inspected at the Environmental Protection Agency Air Docket
				  (6102), Attn: Docket No. A-96-O8, Waterside Mall, 401 M. St. SW., Washington
				  DC; or at the National Archives and Records Administration (NARA). For
				  information on the availability of this material at NARA, call 202-741-6030, or
				  go to:
http://www.archives.gov/federal__register/code__of__federal__regulations/ibr__locations.html
.
				  The owner or operator shall document the National Fire Protection Association
				  flammability hazard rating.
(ii)
				  Gasoline. Regulated substances in gasoline, when in distribution or related
				  storage for use as fuel for internal combustion engines, need not be considered
				  when determining whether more than a threshold quantity is present at a
				  stationary source.
(iii) Naturally
				  occurring hydrocarbon mixtures. Prior to entry into a natural gas processing
				  plant or a petroleum refining process unit, regulated substances in naturally
				  occurring hydrocarbon mixtures need not be considered when determining whether
				  more than a threshold quantity is present at a stationary source. Naturally
				  occurring hydrocarbon mixtures include any combination of the following;
				  condensate, crude oil, field gas, and produced water, each as defined in
				  Section68.3 of this part.
(3) Articles. Regulated substances contained
				  in articles need not be considered when determining whether more than a
				  threshold quantity is present at the stationary source.
(4) Uses. Regulated substances, when in use
				  for the following purposes, need not be included in determining whether more
				  than a threshold quantity is present at the stationary source:
(i) Use as a structural component of the
				  stationary source;
(ii) Use of
				  products for routine janitorial maintenance;
(iii) Use by employees of foods, drugs,
				  cosmetics, or other personal items containing the regulated substance;
				  and
(iv) Use of regulated
				  substances present in process water or noncontact cooling water as drawn from
				  the environment or municipal sources, or use of regulated substances present in
				  air used either as compressed air or as part of combustion.
(5) Activities in laboratories. If
				  a regulated substance is manufactured, processed, or used in a laboratory at a
				  stationary source under the supervision of a technically qualified individual
				  as defined in
				  40
				  CFR 720.3(ee), the quantity
				  of the substance need not be considered in determining whether a threshold
				  quantity is present. This exemption does not apply to:
(i) Specialty chemical production;
(ii) Manufacture, processing, or use of
				  substances in pilot plant scale operations; and
(iii) Activities conducted outside the
				  laboratory.