Authority: IC 13-14-8; IC 13-17-3-4; IC 13-17-3-11

Affected: IC 13-15; IC 13-17

Sec. 4. (a) The department shall determine if a BART-eligible source is subject to BART based upon all of the following criteria:

1. (1) The source meets the definition of BART-eligible source in 40 CFR 51.301*.
2. (2) Modeling conducted in accordance with option 1 of the individual source attribution approach as described in 40 CFR 51, Appendix Y*.
3. (3) The impact on visibility in a Class 1 area as determined by a comparison of the ninety-eighth percentile of the source specific modeling to a 0.5 deciview threshold level. A source causes or contributes to visibility impairment at a Class 1 area when the modeled impacts of that source are equivalent to eight (8) or more days in one (1) year or a total of twenty-two (22) or more days in a three (3) year period that would exceed the 0.5 deciview threshold level.

(b) The department shall provide a written determination to each BART-eligible source indicating if the source has been determined to be subject to BART.

*These documents are incorporated by reference. Copies may be obtained from the Government Printing Office, 732 North Capitol Street NW, Washington, D.C. 20401 or are available for review and copying at the Indiana Department of Environmental Management, Office of Air Quality, Indiana Government Center-North, Tenth Floor, 100 North Senate Avenue, Indianapolis, Indiana 46204.

(Air Pollution Control Division; 326 IAC 26-1-4; filed Jan 23, 2008, 1:37 p.m.: 20080220-IR-326060208FRA; readopted filed Oct 18, 2024, 2:09 p.m.: 20241113-IR-326230809RFA)