Sec. 6.
(a) Any
demonstration under section 5 of this rule shall demonstrate that increased
emissions caused by the proposed major stationary source or major modification
will not exceed eighty percent (80%) of the available maximum allowable
increases (MAI) over the baseline concentrations for sulfur dioxide, PM, and
nitrogen dioxide indicated in subsection (b)(1). Available maximum allowable
increases are determined by adjusting the MAI to include impacts from actual
emissions:
(1) from any major stationary
source or major modification on which construction commenced after the major
source baseline date; and
(2)
increases and decreases at any source occurring after the minor source baseline
date.
On a case-by-case basis, a source may petition the
commissioner to use in excess of this eighty percent (80%). The commissioner
may authorize such use provided the source adequately demonstrates the need for
the same.
(b)
Increment consumption shall be in accordance with the following:
(1) The following allowable increments
reflect the PSD increments for a Class II area (as defined in the CAA). Indiana
has no Class I or Class III areas; however, should some areas of the state be
classified as Class I or III, the PSD increments pursuant to 40 CFR Part 52.21*
to which it must be adhered. New permits issued after January 1, 1995, shall
use PM10 as the indicator for PM. The allowable
increments are as follows:
| Maximum Allowable Increments |
| Pollutants |
Allowable Increments (Micrograms per Cubic Meter,
µg/m3 Limits) |
|
(A) PM: |
|
|
|
(PM10): |
|
|
|
|
Annual arithmetic mean |
17 |
|
|
|
24-hour maximum |
30 |
|
|
(PM2.5): |
|
|
|
|
Annual arithmetic mean |
4 |
|
|
|
24-hour maximum |
9 |
|
(B) Sulfur dioxide: |
|
|
|
Annual arithmetic mean |
20 |
|
|
24-hour maximum |
91 |
|
|
3-hour maximum |
512 |
|
(C) Nitrogen dioxide: |
|
|
|
Annual arithmetic mean |
25 |
(2)
For any period other than the annual period, the applicable maximum allowable
increase may be exceeded during one (1) such period per year at any one (1)
location.
(3) When an applicant
proposes to construct a major stationary source or major modification in an
area designated as attainment or unclassified and the increments listed in
subdivision (1) have been consumed, the increased emissions from the source or
modification may be permitted to be offset by reducing emissions in the
affected areas by an equal amount of the pollutant for which the area was
designated as attainment or unclassified.
(4) The following pollutant concentrations
shall be excluded when determining compliance with a maximum allowable
increase:
(A) Concentrations attributable to
the increase in emissions from sources that have converted from the use of
petroleum products or natural gas, or both, by reason of an order in effect
under Sections 2(a) and 2(b) of the Energy Supply and Environmental
Coordination Act of 1974 over the emissions from the sources before the
effective date of the order.
(B)
Concentrations attributable to the increase in emissions from sources that have
converted from using natural gas by reason of a natural gas curtailment plan in
effect pursuant to the Federal Power Act over the emissions from the sources
before the effective date of the plan.
(C) Concentrations of PM attributable to the
increase in emissions from construction or other temporary emission-related
activities of new or modified sources.
(D) Concentrations attributable to the
temporary increase in emissions of sulfur dioxide, PM, or nitrogen oxides from
stationary sources that are affected by state implementation plan revisions
approved by U.S. EPA are excluded provided the following criteria is met:
(i) The exclusion shall not exceed two (2)
years in duration unless a longer time is approved by the commissioner and the
U.S. EPA.
(ii) The exclusion is not
renewable.
(iii) The exclusion
shall allow no emissions increase that would impact a Class I area or an area
where an applicable increment is known to be violated, or cause or contribute
to a violation of an ambient air quality standard as designated in 326 IAC
1-3.
(iv) An emission limitation
shall be in effect at the end of the time period specified in accordance with
item (i) that will ensure that the emissions levels will not exceed those
levels occurring from the source before the exclusion was granted.
(5) No exclusion of
such a concentration under subdivision (4)(A) and (4)(B) shall apply more than
five (5) years after the date the exclusion is granted under this rule. If both
such order and plan are applicable, no such exclusion shall apply more than
five (5) years after the latter of the effective dates.
*This document is 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.
