Section 326 IAC 6.8-11-4 - Violation of 24-hour standardAuthority: IC 13-14-8; IC 13-17-3-4; IC 13-17-3-11
Affected: IC 4-21.5; IC 13-15; IC 13-17
Sec. 4.
(a) If there is a violation of the twenty-four (24) hour ambient air quality standard for PM10, as determined in accordance with 40 CFR 50, Appendix K*, and before a finding of failure to attain by the administrator of U.S. EPA, the department shall conduct a comprehensive culpability study as described in section 3(a) of this rule for each occurrence that contributed to the violation. Upon completion of the culpability study, the department shall notify the following sources: (1) Any source whose total source-wide PM10 emissions contributed more than twenty-five (25) micrograms per cubic meter to the total concentration at the sampling site on any of the sampling days that contributed to the violation.(2) Any source where a specific facility at the source contributed more than five (5) micrograms per cubic meter to the total concentration at the sampling site on any of the sampling days that contributed to the violation. The department's notification shall include the results of the culpability study.
(b) Within forty-five (45) days of receipt of the notification under subsection (a), the source or sources shall submit to the department the following information:(1) Any source whose total source-wide PM10 emissions contributed more than twenty-five (25) micrograms per cubic meter to the total concentration at the sampling site on any of the sampling days that contributed to the violation shall submit reduction measures that will reduce the source's actual source-wide PM10 emissions by twenty-five percent (25%). A source may substitute other proposed actual emission reductions upon a demonstration that the ambient air quality impact will be equivalent or greater than a source-wide twenty-five percent (25%) reduction.(2) Any source where a specific facility at the source contributed more than five (5) micrograms per cubic meter to the total concentration at the sampling site on any of the sampling days that contributed to the violation shall submit reduction measures that will reduce the facility's actual emissions by twenty-five percent (25%). A source may substitute other proposed actual emission reductions upon a demonstration that the ambient air quality impact will be equivalent or greater than a facility-wide twenty-five percent (25%) reduction. If the culpability study demonstrates that a percent less than twenty-five percent (25%) would ensure that no further violation of the twenty-four (24) hour PM10 standard will occur, under the same circumstances, the department will specify what percent reduction will be required to ensure that no further violations occur.
(c) A source may, instead of the information required in subsection (b), submit an analysis that determines that the source's contribution to the violation twenty-five (25) micrograms per cubic meter or less or, in the case of a facility, five (5) micrograms per cubic meter or less. After reviewing this information, the department shall determine whether the source shall comply with the emission reduction required in subsection (b). The department's decision is subject to IC 4-21.5. *This document is incorporated by reference and is available from the Government Printing Office, 732 North Capitol NW, Washington, D.C. 20401 or is available for review and copying at the Department of Environmental Management, Office of Air Quality, Indiana Government Center-North, Tenth Floor, 100 North Senate Avenue, Indianapolis, Indiana 46204.
Air Pollution Control Board; 326 IAC 6.8-11-4; filed Aug 10, 2005, 1:00 p.m.: 28 IR 3548