North Carolina Administrative Code › Title 15A - Environmental Quality › Chapter 02 - Environmental Management › Subchapter D - AIR POLLUTION CONTROL REQUIREMENTS › Section .1100 - CONTROL OF TOXIC AIR POLLUTANTS › Section 02D .1106 - DETERMINATION OF AMBIENT AIR CONCENTRATION

Current through Register Vol. 39, No. 2, July 15, 2024
(a) Modeling shall not be used for
				  enforcement. Modeling shall be used to determine process operational and air
				  pollution control parameters and emission rates for toxic air pollutants to
				  place in the air quality permit for that facility that will prevent any of the
				  acceptable ambient levels in
				  15A NCAC
				  02D .1104 from being exceeded, except as
				  allowed pursuant to
				  15A NCAC
				  02Q .0700. Enforcing these permit
				  stipulations and conditions shall be the mechanism used to ensure that the
				  requirements of
				  15A NCAC
				  02D .1104, except as allowed by
				  15A NCAC
				  02Q .0700, are met.
(b) The owner or operator of the facility may
				  provide a modeling analysis or may request the Division to perform a modeling
				  analysis of the facility. If the owner or operator of the facility requests the
				  Division to perform the modeling analysis, the owner or operator shall provide
				  emissions rates, stack parameters, and other information that the Division
				  needs to conduct the modeling. The data that the owner or operator of the
				  facility provides the Division to use in the model or in deriving the data used
				  in the model shall be the process, operational, and air pollution control
				  equipment parameters and emission rates that will be contained in the
				  facility's permit. If the Division's initial review of the modeling request
				  indicates extensive or inappropriate use of state resources, or if the
				  Division's modeling analysis fails to show compliance with the acceptable
				  ambient levels in
				  15A NCAC
				  02D .1104, the modeling demonstration shall
				  become the responsibility of the owner or operator of the facility.
(c) When the owner or operator of the
				  facility is responsible for providing the modeling demonstration and the data
				  used in the modeling, the owner or operator of the facility shall use in the
				  model or in deriving data used in the model the process operational and air
				  pollution control equipment parameters and emission rates that will be
				  contained in his or her permit. Sources that are not required to be included in
				  the model shall not be included in the permit to emit toxic air
				  pollutants.
(d) For the following
				  pollutants, modeled emission rates shall be based on the highest emissions
				  occurring in any 15-minute period. The resultant modeled one-hour
				  concentrations shall then be compared to the applicable one-hour acceptable
				  ambient levels to determine compliance:
(1)
				  acetaldehyde (75-07-0);
(2) acetic
				  acid (64-19-7);
(3) acrolein
				  (107-02-8);
(4) ammonia
				  (7664-41-7);
(5) bromine
				  (7726-95-6);
(6) chlorine
				  (7782-50-5);
(7) formaldehyde
				  (50-00-0);
(8) hydrogen chloride
				  (7647-01-0);
(9) hydrogen fluoride
				  (7664-39-3); and
(10) nitric acid
				  (7697-37-2).