326 IAC 7 — ARTICLE 7. SULFUR DIOXIDE RULES

TITLE 326 OFFICE OF AIR QUALITY

ARTICLE 7. SULFUR DIOXIDE RULES

Rule 1

326 IAC 7-1-1 326 IAC 7-1-1 Applicability (Repealed)

Rule 1. Sulfur Dioxide Emission Limitations

326 IAC 7-1-1 Applicability (Repealed)

(Repealed by Office of Air Quality; filed Aug 28, 1990, 4:50 p.m.: 14 IR 81)

326 IAC 7-1-2 326 IAC 7-1-2 Sulfur dioxide emission limitations; conflict with local rules (Repealed)

326 IAC 7-1-2 Sulfur dioxide emission limitations; conflict with local rules (Repealed)

(Repealed by Office of Air Quality; filed Aug 28, 1990, 4:50 p.m.: 14 IR 81)

326 IAC 7-1-3 326 IAC 7-1-3 Reporting requirements and methods to determine compliance (Repealed)

326 IAC 7-1-3 Reporting requirements and methods to determine compliance (Repealed)

(Repealed by Office of Air Quality; filed Aug 28, 1990, 4:50 p.m.: 14 IR 81)

326 IAC 7-1-4 326 IAC 7-1-4 Ambient monitoring; reports (Repealed)

326 IAC 7-1-4 Ambient monitoring; reports (Repealed)

(Repealed by Office of Air Quality; filed Aug 28, 1990, 4:50 p.m.: 14 IR 81)

326 IAC 7-1-5 326 IAC 7-1-5 Control strategies (Repealed)

326 IAC 7-1-5 Control strategies (Repealed)

(Repealed by Office of Air Quality; filed Aug 28, 1990, 4:50 p.m.: 14 IR 81)

326 IAC 7-1-6 326 IAC 7-1-6 Compliance schedules (Repealed)

326 IAC 7-1-6 Compliance schedules (Repealed)

(Repealed by Office of Air Quality; filed Aug 28, 1990, 4:50 p.m.: 14 IR 81)

326 IAC 7-1-7 326 IAC 7-1-7 State implementation plan revisions (Repealed)

326 IAC 7-1-7 State implementation plan revisions (Repealed)

(Repealed by Office of Air Quality; filed Aug 28, 1990, 4:50 p.m.: 14 IR 81)

326 IAC 7-1-8 326 IAC 7-1-8 Lake County sulfur dioxide limitations (Repealed)

326 IAC 7-1-8 Lake County sulfur dioxide limitations (Repealed)

(Repealed by Office of Air Quality; filed Sep 23, 1988, 11:12 a.m.: 12 IR 268)

326 IAC 7-1-8.1 326 IAC 7-1-8.1 Lake County sulfur dioxide emission limitations (Repealed)

326 IAC 7-1-8.1 Lake County sulfur dioxide emission limitations (Repealed)

(Repealed by Office of Air Quality; filed Aug 28, 1990, 4:50 p.m.: 14 IR 81)

326 IAC 7-1-9 326 IAC 7-1-9 Marion County sulfur dioxide emission limitations (Repealed)

326 IAC 7-1-9 Marion County sulfur dioxide emission limitations (Repealed)

(Repealed by Office of Air Quality; filed Aug 28, 1990, 4:50 p.m.: 14 IR 81)

326 IAC 7-1-10 326 IAC 7-1-10 Vigo County sulfur dioxide emission limitations (Repealed)

326 IAC 7-1-10 Vigo County sulfur dioxide emission limitations (Repealed)

(Repealed by Office of Air Quality; filed Jun 30, 1988, 3:00 pm: 11 IR 3787)

326 IAC 7-1-10.1 326 IAC 7-1-10.1 Vigo County sulfur dioxide emission limitations (Repealed)

326 IAC 7-1-10.1 Vigo County sulfur dioxide emission limitations (Repealed)

(Repealed by Office of Air Quality; filed Aug 28, 1990, 4:50 p.m.: 14 IR 81)

326 IAC 7-1-11 326 IAC 7-1-11 Wayne County sulfur dioxide emission limitations (Repealed)

326 IAC 7-1-11 Wayne County sulfur dioxide emission limitations (Repealed)

(Repealed by Office of Air Quality; filed Aug 28, 1990, 4:50 p.m.: 14 IR 81)

326 IAC 7-1-12 326 IAC 7-1-12 Laporte County sulfur dioxide emission limitations (Repealed)

326 IAC 7-1-12 Laporte County sulfur dioxide emission limitations (Repealed)

(Repealed by Office of Air Quality; filed Aug 28, 1990, 4:50 p.m.: 14 IR 81)

326 IAC 7-1-13 326 IAC 7-1-13 Jefferson County sulfur dioxide emission limitations (Repealed)

326 IAC 7-1-13 Jefferson County sulfur dioxide emission limitations (Repealed)

(Repealed by Office of Air Quality; filed Aug 28, 1990, 4:50 p.m.: 14 IR 81)

326 IAC 7-1-14 326 IAC 7-1-14 Sullivan County sulfur dioxide emission limitations (Repealed)

326 IAC 7-1-14 Sullivan County sulfur dioxide emission limitations (Repealed)

(Repealed by Office of Air Quality; filed Aug 28, 1990, 4:50 p.m.: 14 IR 81)

326 IAC 7-1-15 326 IAC 7-1-15 Vermillion County sulfur dioxide emission limitations (Repealed)

326 IAC 7-1-15 Vermillion County sulfur dioxide emission limitations (Repealed)

(Repealed by Office of Air Quality; filed Aug 28, 1990, 4:50 p.m.: 14 IR 81)

326 IAC 7-1-16 326 IAC 7-1-16 Floyd County sulfur dioxide emission limitations (Repealed)

326 IAC 7-1-16 Floyd County sulfur dioxide emission limitations (Repealed)

(Repealed by Office of Air Quality; filed Aug 28, 1990, 4:50 p.m.: 14 IR 81)

326 IAC 7-1-17 326 IAC 7-1-17 Warrick County sulfur dioxide emission limitations (Repealed)

326 IAC 7-1-17 Warrick County sulfur dioxide emission limitations (Repealed)

(Repealed by Office of Air Quality; filed Aug 28, 1990, 4:50 p.m.: 14 IR 81)

326 IAC 7-1-18 326 IAC 7-1-18 Morgan County sulfur dioxide emission limitations (Repealed)

326 IAC 7-1-18 Morgan County sulfur dioxide emission limitations (Repealed)

(Repealed by Office of Air Quality; filed Aug 28, 1990, 4:50 p.m.: 14 IR 81)

326 IAC 7-1-19 326 IAC 7-1-19 Gibson County sulfur dioxide emission limitations (Repealed)

326 IAC 7-1-19 Gibson County sulfur dioxide emission limitations (Repealed)

(Repealed by Office of Air Quality; filed Aug 28, 1990, 4:50 p.m.: 14 IR 81)

326 IAC 7-1-20 326 IAC 7-1-20 Dearborn County sulfur dioxide emission limitations (Repealed)

326 IAC 7-1-20 Dearborn County sulfur dioxide emission limitations (Repealed)

(Repealed by Office of Air Quality; filed Aug 28, 1990, 4:50 p.m.: 14 IR 81)

326 IAC 7-1-21 326 IAC 7-1-21 Porter County sulfur dioxide emission limitations (Repealed)

326 IAC 7-1-21 Porter County sulfur dioxide emission limitations (Repealed)

(Repealed by Office of Air Quality; filed Aug 28, 1990, 4:50 p.m.: 14 IR 81)

Rule 1.1

326 IAC 7-1.1-1 326 IAC 7-1.1-1 Applicability

Rule 1.1. Sulfur Dioxide Emission Limitations

326 IAC 7-1.1-1 Applicability

Authority: IC 13-14-8; IC 13-17-3-4; IC 13-17-3-11; IC 13-17-3-12

Affected: IC 13-15; IC 13-17

Sec. 1. All emissions units with a potential to emit twenty-five (25) tons per year or ten (10) pounds per hour of sulfur dioxide shall comply with the following:

(1) The limitations in section 2 of this rule.

(2) The compliance test methods in 326 IAC 7-2.

(3) The sulfur dioxide emission limitations and other requirements under 326 IAC 2, 326 IAC 7-4, 326 IAC 7-4.1, and 326 IAC 12.

(Office of Air Quality; 326 IAC 7-1.1-1 [NOTE: Under P.L. 135-2026, SECTION 53, the name of Air Pollution Control Division is changed to Office of Air Quality, effective July 1, 2026.]; filed Aug 28, 1990, 4:50 p.m.: 14 IR 52; filed Apr 22, 1997, 2:00 p.m.: 20 IR 2368; filed Dec 20, 2001, 4:30 p.m.: 25 IR 1600; filed May 25, 2005, 10:50 a.m.: 28 IR 2953; readopted filed Oct 18, 2024, 2:09 p.m.: 20241113-IR-326230809RFA)

326 IAC 7-1.1-2 326 IAC 7-1.1-2 Sulfur dioxide emission limitations

326 IAC 7-1.1-2 Sulfur dioxide emission limitations

Authority: IC 13-14-8; IC 13-17-3-4; IC 13-17-3-11; IC 13-17-3-12

Affected: IC 13-15; IC 13-17

Sec. 2. (a) Sulfur dioxide emissions from fuel combustion emissions units shall be limited as follows, unless specified otherwise in 326 IAC 7-4, 326 IAC 7-4.1, or in a construction permit issued under 326 IAC 2:

(1) Six and zero-tenths (6.0) pounds per million British thermal units (MMBtu) for coal combustion.

(2) One and six-tenths (1.6) pounds per MMBtu for residual oil combustion.

(3) Five-tenths (0.5) pound per MMBtu for distillate oil combustion.

(b) For emissions units combusting coal and oil simultaneously, the sulfur dioxide emission limitation shall be six and zero-tenths (6.0) pounds per MMBtu. For emissions units combusting oil and any fuel other than coal simultaneously, the sulfur dioxide emission limitation shall be the limitation specified in subsection (a)(2) or (a)(3), depending on the type of oil combusted. For the purposes of this subsection, simultaneous combustion of coal and oil shall include those periods of startup, shutdown, and flame stabilization required under normal operations.

(Office of Air Quality; 326 IAC 7-1.1-2 [NOTE: Under P.L. 135-2026, SECTION 53, the name of Air Pollution Control Division is changed to Office of Air Quality, effective July 1, 2026.]; filed Aug 28, 1990, 4:50 p.m.: 14 IR 52; filed Apr 22, 1997, 2:00 p.m.: 20 IR 2369; filed Dec 20, 2001, 4:30 p.m.: 25 IR 1600; filed May 25, 2005, 10:50 a.m.: 28 IR 2953; readopted filed Oct 18, 2024, 2:09 p.m.: 20241113-IR-326230809RFA)

326 IAC 7-1.1-3 326 IAC 7-1.1-3 Compliance date

326 IAC 7-1.1-3 Compliance date

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

Affected: IC 13-15; IC 13-17

Sec. 3. The emission limitations in 326 IAC 7-4-2.1, 326 IAC 7-4-3.1, 326 IAC 7-4-11.1, and 326 IAC 7-4-15 are effective January 1, 2017.

(Office of Air Quality; 326 IAC 7-1.1-3 [NOTE: Under P.L. 135-2026, SECTION 53, the name of Air Pollution Control Division is changed to Office of Air Quality, effective July 1, 2026.]; filed Sep 2, 2015, 1:50 p.m.: 20150930-IR-326110356FRA; readopted filed Oct 18, 2024, 2:09 p.m.: 20241113-IR-326230809RFA)

Rule 2

326 IAC 7-2-1 326 IAC 7-2-1 Reporting requirements; methods to determine compliance

Rule 2. Compliance

326 IAC 7-2-1 Reporting requirements; methods to determine compliance

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

Affected: IC 13-15; IC 13-17

Sec. 1. (a) As used in this article, "weighting factor" means the daily quantity of coal bunkered or megawatt generation or other appropriate measure of the output of a combustion source.

(b) As used in this article, "rolling weighted average sulfur dioxide emission rate" means the summation of the average sulfur dioxide emission rate times the daily weighting factor divided by the summation of the weighting factors.

(c) Owners or operators of sources or emissions units subject to 326 IAC 7-1.1, 326 IAC 7-4, or 326 IAC 7-4.1 shall submit to the commissioner the following reports based on fuel sampling and analysis data obtained in accordance with procedures specified under 326 IAC 3-7:

(1) Fuel combustion sources with total coal-fired heat input capacity greater than or equal to one thousand five hundred (1,500) million British thermal units (MMBtu) per hour shall submit quarterly reports of the thirty (30) day rolling weighted average sulfur dioxide emission rate in pounds per MMBtu. Records of the daily average coal sulfur content, coal heat content, weighting factor, and daily average sulfur dioxide emission rate in pounds per MMBtu shall be submitted to the department in the quarterly report and maintained by the source owner or operator for a period of at least two (2) years.

(2) Fuel combustion sources with total coal-fired heat input capacity greater than one hundred (100) and less than one thousand five hundred (1,500) MMBtu per hour shall submit quarterly reports of the calendar month average coal sulfur content, coal heat content, and sulfur dioxide emission rate in pounds per MMBtu and the total monthly coal consumption.

(3) All other fuel combustion sources shall submit reports of calendar month average sulfur content, heat content, fuel consumption, and sulfur dioxide emission rate in pounds per MMBtu upon request.

(d) Fuel sampling and analysis data shall be collected pursuant to the procedures specified in 326 IAC 3-7-2 or 326 IAC 3-7-3 for coal combustion or 326 IAC 3-7-4 for oil combustion. Computation of calculated sulfur dioxide emission rates from fuel sampling and analysis data shall be based on the emission factors contained in U.S. EPA publication AP-42* unless other emission factors based on site-specific sulfur dioxide measurements are approved by the commissioner and U.S. EPA. Fuel sampling and analysis data shall be collected as follows:

(1) For coal-fired fuel combustion sources with heat input capacity greater than or equal to one thousand five hundred (1,500) MMBtu per hour, compliance shall be determined using a thirty (30) day rolling weighted average sulfur dioxide emission rate in pounds per MMBtu unless a shorter averaging time or alternate averaging methodology is specified for a source under this article.

(2) For all other combustion sources, compliance shall be determined using a calendar month average sulfur dioxide emission rate in pounds per MMBtu unless a shorter averaging time or alternate averaging methodology is specified for a source under this article.

(e) Subsection (c) does not apply when continuous emission monitoring data collected and reported under 326 IAC 3-5 is used as the means for determining compliance with the emission limitations in this article.

(f) Owners or operators of sources or emission units subject to a restriction on the number of operating hours in 326 IAC 7-4 shall maintain, and make available to the department upon request, a log of operating hours for each emission unit.

(g) When determining compliance using continuous emission monitoring data, the diluent cap methodology under 40 CFR 75 may be used to calculate emissions in lbs/MMBtu.

(h) Compliance or noncompliance with the emission limitations contained in 326 IAC 7-1.1 or 326 IAC 7-4 may be determined by an appropriate method as follows:

(1) A stack test conducted in accordance with 326 IAC 3-6 using procedures in 40 CFR 60, Appendix A, Method 6*, 6A*, 6C*, or 8*.

(2) A continuous emission monitoring system in accordance with 326 IAC 3-5.

(3) Source sampling in accordance with 326 IAC 3-6.

(4) Fuel sampling and analysis data collected in accordance with subsection (d) or 326 IAC 3-7.

(5) Other methods approved by the commissioner and U.S. EPA.

*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 Legal Counsel, Indiana Government Center North, Thirteenth Floor, 100 North Senate Avenue, Indianapolis, Indiana 46204.

(Office of Air Quality; 326 IAC 7-2-1 [NOTE: Under P.L. 135-2026, SECTION 53, the name of Air Pollution Control Division is changed to Office of Air Quality, effective July 1, 2026.]; filed Aug 28, 1990, 4:50 p.m.: 14 IR 52; filed Jan 30, 1998, 4:00 p.m.: 21 IR 2078; errata filed Feb 9, 1999, 4:06 p.m.: 22 IR 2006; readopted filed Jan 10, 2001, 3:20 p.m.: 24 IR 1477; errata filed Nov 7, 2001, 3:00 p.m.: 25 IR 813; errata filed Dec 12, 2002, 3:30 p.m.: 26 IR 1565; filed Aug 26, 2004, 11:30 a.m.: 28 IR 42; filed May 25, 2005, 10:50 a.m.: 28 IR 2953; filed Aug 11, 2011, 1:54 p.m.: 20110907-IR-326050330FRA; filed Sep 2, 2015, 1:50 p.m.: 20150930-IR-326110356FRA; readopted filed Oct 18, 2024, 2:09 p.m.: 20241113-IR-326230809RFA)

Rule 3

326 IAC 7-3-1 326 IAC 7-3-1 Applicability

Rule 3. Ambient Monitoring

326 IAC 7-3-1 Applicability

Authority: IC 13-14-8; IC 13-17-3-4; IC 13-17-3-11; IC 13-17-3-12

Affected: IC 13-15; IC 13-17

Sec. 1. Sources with total actual emissions of sulfur dioxide greater than ten thousand (10,000) tons per year are subject to the requirements of this rule.

(Office of Air Quality; 326 IAC 7-3-1 [NOTE: Under P.L. 135-2026, SECTION 53, the name of Air Pollution Control Division is changed to Office of Air Quality, effective July 1, 2026.]; filed Aug 28, 1990, 4:50 p.m.: 14 IR 53; filed Apr 22, 1997, 2:00 p.m.: 20 IR 2369; filed Dec 20, 2001, 4:30 p.m.: 25 IR 1600; readopted filed Oct 18, 2024, 2:09 p.m.: 20241113-IR-326230809RFA)

326 IAC 7-3-2 326 IAC 7-3-2 Ambient monitoring

326 IAC 7-3-2 Ambient monitoring

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

Affected: IC 13-15; IC 13-17

Sec. 2. (a) The source owner or operator shall install and operate continuous ambient sulfur dioxide air quality monitors and a meteorological data acquisition system according to a monitoring plan submitted to the commissioner for approval. At a minimum, the monitoring plan shall contain the following requirements:

(1) Installation and operation of one (1) or two (2) air quality monitors and one (1) meteorological instrumentation system capable of measuring wind speed and wind direction at a height of at least ten (10) meters above grade. The monitor shall be located in areas of expected maximum ambient concentration as determined by methods acceptable to the commissioner.

(2) Reporting of the air quality and meteorological data in a format specified by the commissioner within ninety (90) days after the end of each calendar quarter.

(3) Operation of the air quality monitor and meteorological instrumentation in accordance with a quality assurance program specified by the commissioner.

(b) A monitoring plan shall be submitted to the department prior to October 1, 1991. The commissioner may require that the monitoring plan be modified, at any time, consistent with the requirements of this section.

(c) Source owners or operators subject to the requirements of this rule, located in the same county, may submit a joint monitoring plan to satisfy the requirements of this rule. The joint monitoring plan shall specify the responsible owner or operator for each requirement in subsection (a). Upon approval by the commissioner, the joint monitoring plan may contain fewer than two (2) air quality monitors and one (1) meteorological station per owner or operator.

(d) A source owner or operator may petition the commissioner for an administrative waiver of all or some of the requirements of this section if such owner or operator can demonstrate that ambient monitoring is unnecessary to determine continued maintenance of the sulfur dioxide ambient air quality standards in the vicinity of the source. The demonstration shall address uncertainties in any air quality dispersion models used in the demonstration and shall address the adequacy of any existing monitoring data to characterize the worst-case ambient concentrations in the vicinity of the source. A waiver shall be effective upon written approval by the commissioner. The commissioner may establish conditions in the approval of a waiver to assure compliance with the provisions of this article. Failure to continuously meet the requirements for obtaining a waiver or failure to comply with any condition contained in the approval of a waiver shall render void any waiver issued.

(Office of Air Quality; 326 IAC 7-3-2 [NOTE: Under P.L. 135-2026, SECTION 53, the name of Air Pollution Control Division is changed to Office of Air Quality, effective July 1, 2026.]; filed Aug 28, 1990, 4:50 p.m.: 14 IR 53; readopted filed Oct 18, 2024, 2:09 p.m.: 20241113-IR-326230809RFA)

Rule 4

326 IAC 7-4-1 326 IAC 7-4-1 Lake County sulfur dioxide emission limitations (Repealed)

Rule 4. Emission Limitations and Requirements by County

326 IAC 7-4-1 Lake County sulfur dioxide emission limitations (Repealed)

(Repealed by Office of Air Quality; filed Aug 8, 1991, 10:00 a.m.: 14 IR 2218)

326 IAC 7-4-1.1 326 IAC 7-4-1.1 Lake County sulfur dioxide emission limitations (Repealed)

326 IAC 7-4-1.1 Lake County sulfur dioxide emission limitations (Repealed)

(Repealed by Office of Air Quality; filed May 25, 2005, 10:50 a.m.: 28 IR 2966)

326 IAC 7-4-2 326 IAC 7-4-2 Marion County sulfur dioxide emission limitations (Repealed)

326 IAC 7-4-2 Marion County sulfur dioxide emission limitations (Repealed)

(Repealed by Office of Air Quality; filed Sep 2, 2015, 1:50 p.m.: 20150930-IR-326110356FRA, eff Jan 1, 2017)

326 IAC 7-4-2.1 326 IAC 7-4-2.1 Marion County sulfur dioxide emission limitations

326 IAC 7-4-2.1 Marion County sulfur dioxide emission limitations

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

Affected: IC 13-15; IC 13-17

Sec. 2.1. (a) On and after January 1, 2017, sources and emission units located in Marion County shall comply with the sulfur dioxide emission limit and other requirements, as follows:

(b) Compliance with the emission limit in subsection (a)(5) shall be determined by using quality assured hourly average continuous emission monitoring system data.

*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 Legal Counsel, Indiana Government Center North, Thirteenth Floor, 100 North Senate Avenue, Indianapolis, Indiana 46204.

(Office of Air Quality; 326 IAC 7-4-2.1 [NOTE: Under P.L. 135-2026, SECTION 53, the name of Air Pollution Control Division is changed to Office of Air Quality, effective July 1, 2026.]; filed Sep 2, 2015, 1:50 p.m.: 20150930-IR-326110356FRA; readopted filed Oct 18, 2024, 2:09 p.m.: 20241113-IR-326230809RFA)

326 IAC 7-4-3 326 IAC 7-4-3 Vigo County sulfur dioxide emission limitations (Repealed)

326 IAC 7-4-3 Vigo County sulfur dioxide emission limitations (Repealed)

(Repealed by Office of Air Quality; filed Sep 2, 2015, 1:50 p.m.: 20150930-IR-326110356FRA, eff Jan 1, 2017)

326 IAC 7-4-3.1 326 IAC 7-4-3.1 Vigo County sulfur dioxide emission limitations

326 IAC 7-4-3.1 Vigo County sulfur dioxide emission limitations

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

Affected: IC 13-15; IC 13-17

Sec. 3.1. (a) On and after January 1, 2017, sources and emission units located in Vigo County shall comply with the sulfur dioxide emission limits and other requirements, as follows:

(b) Compliance with the emission limit in subsection (a)(1) shall be determined by using quality assured hourly average continuous emission monitoring system data.

(c) Compliance with the emission limit in subsection (a)(2)(A) shall be determined by calculating the thirty (30) unit operating day rolling arithmetic average emission rate at the end of each unit operating day using all of the quality assured hourly average continuous emission monitoring system data for the previous thirty (30) unit operating days. Unit operating day means a twenty-four (24) hour period that begins at midnight and ends the following midnight during which the unit is operated. It is not necessary for the unit to be operating the entire twenty-four (24) hour period.

(Office of Air Quality; 326 IAC 7-4-3.1 [NOTE: Under P.L. 135-2026, SECTION 53, the name of Air Pollution Control Division is changed to Office of Air Quality, effective July 1, 2026.]; filed Sep 2, 2015, 1:50 p.m.: 20150930-IR-326110356FRA; readopted filed Oct 18, 2024, 2:09 p.m.: 20241113-IR-326230809RFA)

326 IAC 7-4-4 326 IAC 7-4-4 Wayne County sulfur dioxide emission limitations

326 IAC 7-4-4 Wayne County sulfur dioxide emission limitations

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

Affected: IC 13-17

Sec. 4. The following sources and facilities located in Wayne County shall comply with the sulfur dioxide emission limitations in pounds per million Btu, unless otherwise specified, and other requirements:

Kemper Boilers 1 and 2 also shall be limited to one and three-tenths (1.3) pounds per million Btu, and Boiler 3 also shall be limited to one and two-tenths (1.2) pounds per million Btu based on the annual average sulfur content of the fuel over any twelve (12) consecutive month period.

NATCO Boiler 1 also shall be limited to three and seven-tenths (3.7) pounds per million Btu based on the annual average sulfur content of the fuel over any twelve (12) consecutive month period.

RP&L shall construct a new good engineering practice stack with height of at least three hundred twenty-five (325) feet above grade by July 31, 1988.

Sanyo E&E Boilers 1 and 2 also shall be limited to three and nine-tenths (3.9) pounds per million Btu based on the annual average sulfur content of the fuel over any twelve (12) consecutive month period.

(Office of Air Quality; 326 IAC 7-4-4 [NOTE: Under P.L. 135-2026, SECTION 53, the name of Air Pollution Control Division is changed to Office of Air Quality, effective July 1, 2026.]; filed Aug 28, 1990, 4:50 p.m.: 14 IR 73; readopted filed Jan 10, 2001, 3:20 p.m.: 24 IR 1477; readopted filed Oct 18, 2024, 2:09 p.m.: 20241113-IR-326230809RFA)

326 IAC 7-4-5 326 IAC 7-4-5 LaPorte County sulfur dioxide emission limitations

326 IAC 7-4-5 LaPorte County sulfur dioxide emission limitations

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

Affected: IC 13-17

Sec. 5. The following sources and facilities located in LaPorte County shall comply with the sulfur dioxide emission limitations in pounds per million Btu and other requirements:

(A) A log of hourly operating status for Units 4, 5, and 6 shall be maintained and made available to the department upon request. A summary indicating which boilers were in service each day of a calendar quarter shall be submitted to the department on a quarterly basis. In addition, records of the daily average sulfur content and sulfur dioxide emission rate for each day in which more than one (1) of Units 4, 5, and 6 were in operation shall be submitted to the department quarterly.

(B) For the purposes of 326 IAC 7-2-1(c)(1), during thirty (30) day periods in which NIPSCo relies on more than one (1) set of limits contained in this subdivision, a separate thirty (30) day rolling weighted average for each set of limits shall be determined. Each thirty (30) day rolling weighted average shall be based on data from the previous thirty (30) operational days within the last ninety (90) days for that set of limits. If NIPSCo does not operate thirty (30) days under any one (1) set of limits within the last ninety (90) days, the rolling weighted average shall be based on all operational days within the last ninety (90) days for that set of limits.

(C) For periods when natural gas is the only fuel being burned in Units 4, 5, or 6, the reporting required in clauses (A) and (B) shall be satisfied by indicating that natural gas was the only fuel burned. No reporting of sulfur dioxide emission rates is necessary for these periods.

(Office of Air Quality; 326 IAC 7-4-5 [NOTE: Under P.L. 135-2026, SECTION 53, the name of Air Pollution Control Division is changed to Office of Air Quality, effective July 1, 2026.]; filed Aug 28, 1990, 4:50 p.m.: 14 IR 73; readopted filed Jan 10, 2001, 3:20 p.m.: 24 IR 1477; readopted filed Oct 18, 2024, 2:09 p.m.: 20241113-IR-326230809RFA)

326 IAC 7-4-6 326 IAC 7-4-6 Jefferson County sulfur dioxide emission limitations

326 IAC 7-4-6 Jefferson County sulfur dioxide emission limitations

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

Affected: IC 13-17

Sec. 6. The following sources and facilities located in Jefferson County shall comply with the sulfur dioxide emission limitations in pounds per million Btu:

(Office of Air Quality; 326 IAC 7-4-6 [NOTE: Under P.L. 135-2026, SECTION 53, the name of Air Pollution Control Division is changed to Office of Air Quality, effective July 1, 2026.]; filed Aug 28, 1990, 4:50 p.m.: 14 IR 74; readopted filed Jan 10, 2001, 3:20 p.m.: 24 IR 1477; readopted filed Oct 18, 2024, 2:09 p.m.: 20241113-IR-326230809RFA)

326 IAC 7-4-7 326 IAC 7-4-7 Sullivan County sulfur dioxide emission limitations

326 IAC 7-4-7 Sullivan County sulfur dioxide emission limitations

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

Affected: IC 13-17

Sec. 7. The following sources and facilities located in Sullivan County shall comply with the sulfur dioxide emission limitations in pounds per million Btu:

(Office of Air Quality; 326 IAC 7-4-7 [NOTE: Under P.L. 135-2026, SECTION 53, the name of Air Pollution Control Division is changed to Office of Air Quality, effective July 1, 2026.]; filed Aug 28, 1990, 4:50 p.m.: 14 IR 74; readopted filed Jan 10, 2001, 3:20 p.m.: 24 IR 1477; readopted filed Oct 18, 2024, 2:09 p.m.: 20241113-IR-326230809RFA)

326 IAC 7-4-8 326 IAC 7-4-8 Vermillion County sulfur dioxide emission limitations

326 IAC 7-4-8 Vermillion County sulfur dioxide emission limitations

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

Affected: IC 13-17

Sec. 8. The following sources and facilities located in Vermillion County shall comply with the sulfur dioxide emission limitations in pounds per million Btu and other requirements:

(A) Upon certification by PSI to the commissioner that the Universal Mine cannot assure a long term supply of compliance coal, final compliance with the four and forty-hundredths (4.40) pounds per million Btu sulfur dioxide emission limitation may be extended until December 31, 1989. The commissioner shall notify the U.S. EPA upon receipt of such a certification by PSI.

(B) PSI may at any time petition the commissioner for a four and forty-eight hundredths (4.48) pounds per million Btu final sulfur dioxide emission limitation. The petition shall include evidence that such a limitation will protect the sulfur dioxide ambient air quality standards on all land not fenced or otherwise effectively restricted from public access. If the commissioner approves such a petition, the department shall amend the operation permit according to procedures specified in 326 IAC 2 and submit the revised permit to U.S. EPA.

(Office of Air Quality; 326 IAC 7-4-8 [NOTE: Under P.L. 135-2026, SECTION 53, the name of Air Pollution Control Division is changed to Office of Air Quality, effective July 1, 2026.]; filed Aug 28, 1990, 4:50 p.m.: 14 IR 74; readopted filed Jan 10, 2001, 3:20 p.m.: 24 IR 1477; readopted filed Oct 18, 2024, 2:09 p.m.: 20241113-IR-326230809RFA)

326 IAC 7-4-9 326 IAC 7-4-9 Floyd County sulfur dioxide emission limitations

326 IAC 7-4-9 Floyd County sulfur dioxide emission limitations

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

Affected: IC 13-17

Sec. 9. Sulfur dioxide emissions from the Public Service Indiana (PSI) Gallagher Plant Units 1, 2, 3, and 4 shall be limited to four and seven-tenths (4.7) pounds per million Btu each.

(Office of Air Quality; 326 IAC 7-4-9 [NOTE: Under P.L. 135-2026, SECTION 53, the name of Air Pollution Control Division is changed to Office of Air Quality, effective July 1, 2026.]; filed Aug 28, 1990, 4:50 p.m.: 14 IR 74; readopted filed Jan 10, 2001, 3:20 p.m.: 24 IR 1477; readopted filed Oct 18, 2024, 2:09 p.m.: 20241113-IR-326230809RFA)

326 IAC 7-4-10 326 IAC 7-4-10 Warrick County sulfur dioxide emission limitations

326 IAC 7-4-10 Warrick County sulfur dioxide emission limitations

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

Affected: IC 13-15; IC 13-17; IC 13-22

Sec. 10. (a) The following sources and facilities located in Warrick County shall comply with the sulfur dioxide emission limitations in pounds per million Btu, unless otherwise specified, and other requirements:

(1) Southern Indiana Gas and Electric Company (SIGECO)

(B) As an alternative to the emission limitations specified in clause (A), beginning August 1, 1991, sulfur dioxide emissions from Culley Units 1 and 2 shall be limited as follows:

(C) SIGECO shall notify the department and the U.S. EPA via certified mail at least fourteen (14) days prior to its intention to rely on the set of limits in clause (B) or to switch between sets of limits listed in clauses (A) and (B).

(D) For the purposes of 326 IAC 7-2-1(e)(1), during thirty (30) day periods in which SIGECO relies on more than one (1) set of limits contained in clauses (A) and (B), a separate thirty (30) day rolling weighted average for each set of limits shall be determined. Each thirty (30) day rolling weighted average shall be based on data from the previous thirty (30) operational days within the last ninety (90) days for that set of limits. If SIGECO does not operate thirty (30) days under any one (1) set of limits within the last ninety (90) days, the rolling weighted average shall be based on all operational days within the last ninety (90) days for that set of limits.

(E) Units 2 and 3 shall maintain a thirty (30) day rolling average sulfur dioxide (SO2) removal efficiency of at least ninety-five percent (95%) using continuous emissions monitoring system (CEMS) data from both the inlet and outlet of the control device determined in accordance with 40 CFR 75*. A thirty (30) day rolling average sulfur dioxide (SO2) removal efficiency means the percent reduction in the mass of a pollutant achieved by a unit's pollution control device over a thirty (30) day period using the thirty (30) day rolling average emission rate. A thirty (30) day rolling average emission rate shall be determined by calculating an arithmetic average of all hourly emission rates in lb/MMBtu for the current day and the previous twenty-nine (29) operating days. A new thirty (30) day rolling average emission rate shall be calculated for each new operating day. Each thirty (30) day rolling average emission rate shall include all startup, shutdown, and malfunction periods within an operating day.

(F) SIGECO shall continuously operate the flue gas desulfurization system (FGD) serving Units 2 and 3 at all times the units are in operation. Following startup of the units, SIGECO need not operate the FGD until either unit is fired with any coal. In the event of a planned FGD outage, SIGECO may continue to operate Unit 2, but shall burn down the coal existing in the Unit 2 bunker to the extent practicable, and, prior to shutting down the FGD, load compliance coal into the bunker for use until such time as the FGD resumes operation. In the event of an unplanned FGD outage, SIGECO shall feed compliance coal to the Unit 2 bunker until such time as the FGD resumes operation. Compliance coal is defined as two (2.0) lb/MMBtu SO2, as demonstrated by a four (4) hour composite sample of the feed stock.

(2) Aluminum Company of America (ALCOA) Warrick Power Plant

Unit 4 is jointly owned by ALCOA and SIGECO.

(3) ALCOA-Warrick Smelter Operations shall comply with the sulfur dioxide emission limitations in pounds per hour, unless otherwise specified, and other requirements as follows:

Any sulfur dioxide emission limitation established in a permit issued in conformance with the prevention of significant deterioration rules under 326 IAC 2-2 or 40 CFR 52*, if more stringent, shall supersede the requirements in this subdivision.

(b) Compliance with the pounds per hour limitations specified in subsection (a)(4) shall be based on a stack test under 326 IAC 7-2-1(d).

(c) Compliance with the tons per year limitations specified in subsection (a)(4) shall be based on a rolling twelve (12) consecutive month emission total. Monthly sulfur dioxide emissions shall be determined from calendar month material balances using actual average sulfur content and material throughput. Quarterly reports shall be submitted to the department containing the calendar month and rolling twelve (12) month sulfur dioxide emissions from the smelter operations (potline scrubber stacks, roof monitors, and anode bake ring furnace). The report shall:

(1) include documentation of the data and methodology used to calculate the monthly sulfur dioxide emissions; and

(2) be submitted by the end of the month following the end of the quarter.

*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.

(Office of Air Quality; 326 IAC 7-4-10 [NOTE: Under P.L. 135-2026, SECTION 53, the name of Air Pollution Control Division is changed to Office of Air Quality, effective July 1, 2026.]; filed Aug 28, 1990, 4:50 p.m.: 14 IR 75; readopted filed Jan 10, 2001, 3:20 p.m.: 24 IR 1477; errata filed Dec 12, 2002, 3:35 p.m.: 26 IR 1568; filed Aug 26, 2004, 11:30 a.m.: 28 IR 43; filed Jul 31, 2008, 4:00 p.m.: 20080827-IR-326070309FRA; readopted filed Oct 18, 2024, 2:09 p.m.: 20241113-IR-326230809RFA)

326 IAC 7-4-11 326 IAC 7-4-11 Morgan County sulfur dioxide emission limitations (Repealed)

326 IAC 7-4-11 Morgan County sulfur dioxide emission limitations (Repealed)

(Repealed by Office of Air Quality; filed Sep 2, 2015, 1:50 p.m.: 20150930-IR-326110356FRA, eff Jan 1, 2017)

326 IAC 7-4-11.1 326 IAC 7-4-11.1 Morgan County sulfur dioxide emission limitations

326 IAC 7-4-11.1 Morgan County sulfur dioxide emission limitations

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

Affected: IC 13-15; IC 13-17

Sec. 11.1. (a) On and after January 1, 2017, sources and emission units located in Morgan County shall comply with the sulfur dioxide emission limits and other requirements, as follows:

(b) HPB shall comply with the sulfur dioxide emission limits in subsection (a)(2) as follows:

(1) The emission limit applies to sulfur dioxide emissions from both the combustion of coal and the processing of shale.

(2) Monthly fuel sampling and analysis data shall be collected according to 326 IAC 7-2-1 for both coal and shale.

(3) HPB shall install and operate a limestone injection system to control sulfur dioxide emissions from Kiln 4 and Kiln 5.

(4) Compliance with the control efficiency limit in subsection (a)(2) shall be based on measured sulfur content in the shale and fuel compared to the outlet SO2 concentration determined by a stack test pursuant to 326 IAC 3-6. The shale and fuel sulfur content measurements for this purpose shall reflect a representative sample of the material fed into the kiln during each run of the stack test.

(Office of Air Quality; 326 IAC 7-4-11.1 [NOTE: Under P.L. 135-2026, SECTION 53, the name of Air Pollution Control Division is changed to Office of Air Quality, effective July 1, 2026.]; filed Sep 2, 2015, 1:50 p.m.: 20150930-IR-326110356FRA; readopted filed Oct 18, 2024, 2:09 p.m.: 20241113-IR-326230809RFA)

326 IAC 7-4-12 326 IAC 7-4-12 Gibson County sulfur dioxide emission limitations (Repealed)

326 IAC 7-4-12 Gibson County sulfur dioxide emission limitations (Repealed)

(Repealed by Office of Air Quality; filed Nov 5, 1990, 11:53 a.m.: 14 IR 439)

326 IAC 7-4-12.1 326 IAC 7-4-12.1 Gibson County sulfur dioxide emission limitations

326 IAC 7-4-12.1 Gibson County sulfur dioxide emission limitations

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

Affected: IC 13-17

Sec. 12.1. (a) Prior to January 1, 1992, Public Service Indiana (PSI) Gibson Units 1, 2, 3, 4, and 5 shall comply with the sulfur dioxide emission limitations in pounds per million Btu (lbs./MMBtu) and other requirements as follows:

(b) Beginning January 1, 1992, Public Service Indiana (PSI) Gibson Units 1, 2, 3, 4, and 5 shall comply with the sulfur dioxide emission limitations in pounds per million Btu (lbs./MMBtu) and other requirements as provided under either subdivision (1) or (2) as follows:

In order to achieve compliance with the sixty-hundredths (0.60) pounds per million Btu emission limitation for Unit 4, PSI shall install and operate a flue gas desulfurization (FGD) system on Unit 4 as follows:

(A) Select architectural engineer for design of FGD system by July 1, 1992.

(B) Award contract for construction of FGD system and begin construction by July 1, 1993.

(C) Complete construction of FGD system by July 1, 1995.

(D) Begin operation of FGD system by December 31, 1995.

PSI shall indicate in a certified letter to the commissioner whether it intends to comply with the emission limitations and other requirements under either subdivision (1) or (2) by December 31, 1991.

(c) Notwithstanding PSI's decision to comply as provided under either subsection (b)(1) or (b)(2), PSI shall:

(1) secure contracts by July 1, 1991, for the purchase of low-sulfur coal sufficient to attain and maintain compliance with the applicable emission limitations contained in subsection (b)(1) or (b)(2);

(2) complete test coal burns and engineering studies by July 1, 1994, to determine the need for particulate control upgrades in order to meet the applicable emission limitations;

(3) complete particulate control upgrades, as necessary, by December 31, 1995;

(4) establish procedures and complete equipment installation, as appropriate, for coal blending on Units 1, 2, 3, and 4:

(A) by September 30, 1991, in order to meet the interim emission limitation of three and fifty-seven hundredths (3.57) pounds per million Btu by December 31, 1991; and

(B) by September 30, 1993, in order to meet the interim emission limitation of three and thirteen-hundredths (3.13) pounds per million Btu by December 31, 1993;

(5) turn over existing coal stockpile to eliminate higher sulfur coal by December 31, 1991; and

(6) construct or utilize effective physical barriers, prior to December 31, 1991, to restrict public access to areas of the PSI Gibson property for which modeled violations were predicted based on the emission limitation of three and fifty-seven hundredths (3.57) pounds per million Btu.

(Office of Air Quality; 326 IAC 7-4-12.1 [NOTE: Under P.L. 135-2026, SECTION 53, the name of Air Pollution Control Division is changed to Office of Air Quality, effective July 1, 2026.]; filed Nov 5, 1990, 11:53 a.m.: 14 IR 438; readopted filed Jan 10, 2001, 3:20 p.m.: 24 IR 1477; readopted filed Oct 18, 2024, 2:09 p.m.: 20241113-IR-326230809RFA)

326 IAC 7-4-13 326 IAC 7-4-13 Dearborn County sulfur dioxide emission limitations

326 IAC 7-4-13 Dearborn County sulfur dioxide emission limitations

Authority: IC 13-14-8; IC 13-17-3-4; IC 13-17-3-11; IC 13-17-3-12

Affected: IC 13-15; IC 13-17

Sec. 13. The following sources and facilities located in Dearborn County shall comply with the sulfur dioxide emission limitations in pounds per million Btu and other requirements:

(Office of Air Quality; 326 IAC 7-4-13 [NOTE: Under P.L. 135-2026, SECTION 53, the name of Air Pollution Control Division is changed to Office of Air Quality, effective July 1, 2026.]; filed Aug 28, 1990, 4:50 p.m.: 14 IR 77; filed Apr 18, 1995, 3:00 p.m.: 18 IR 2220; readopted filed Jan 10, 2001, 3:20 p.m.: 24 IR 1477; filed Feb 14, 2005, 11:05 a.m.: 28 IR 2021; readopted filed Oct 18, 2024, 2:09 p.m.: 20241113-IR-326230809RFA)

326 IAC 7-4-14 326 IAC 7-4-14 Porter County sulfur dioxide emission limitations

326 IAC 7-4-14 Porter County sulfur dioxide emission limitations

Authority: IC 13-14-8; IC 13-17

Affected: IC 13-15

Sec. 14. The following sources and emissions units located in Porter County shall comply with the sulfur dioxide emission limitations in pounds per million Btu (lbs/MMBtu) and pounds per hour (lbs/hr), unless otherwise specified, and other requirements:

(1) ArcelorMittal Burns Harbor LLC, Source Identification Number 127-00001, shall comply with the following:

(A) The following emissions units must burn natural gas only:

(i) BOF Shop FM Boiler.

(ii) 160 inch Plate Mill Continuous Hardening and Annealing Heat Treatment Furnace.

(iii) 160 inch Plate Mill Boilers No. 2 and 4.

(iv) Batch Annealing Furnaces (24).

(v) Continuous Heat Treat Line – Preheat, Heating and Soaking, and Reheat.

(B) The following emissions units must comply with the sulfur dioxide emission limitations and other requirements:

(C) Coke oven gas usage at emissions units other than the No. 1 and 2 Coke Battery Underfire Stacks are restricted to not more than seventy-five (75) million cubic feet per day. Total sulfur dioxide emissions from the facilities listed in clause (B)(i) through (B)(iii), (B)(vi) through (B)(ix), and (B)(xi) through (B)(xiv) must not exceed four thousand four hundred twenty-nine (4,429) pounds per hour.

(D) ArcelorMittal Burns Harbor LLC shall comply with the requirements specified in clause (B) prior to December 31, 1988. Thereafter, ArcelorMittal Burns Harbor LLC shall submit a report to the department within thirty (30) days following the end of each calendar quarter containing the following information:

(i) Records of the total coke oven gas, blast furnace gas, fuel oil, and natural gas usage for each day at each emissions unit listed in clause (B).

(ii) Records of the average sulfur content and heating value as determined per the procedures specified in clause (E) for each fuel type used during the calendar quarter.

(E) Except for sampling and analysis of blast furnace gas that is subject to the protocol in clause (G), ArcelorMittal Burns Harbor LLC shall submit a sampling and analysis protocol to the department by December 31, 1988. The protocol must:

(i) contain a description of planned procedures for:

(AA) sampling of sulfur-bearing fuels and materials;

(BB) analysis of the sulfur content; and

(CC) any planned direct measurement of sulfur dioxide emissions vented to the atmosphere; and

(ii) specify the frequency of sampling, analysis, and measurement for each:

(AA) fuel and material; and

(BB) emissions unit.

The department shall incorporate the protocol into the source's operation permit per procedures specified in 326 IAC 2. The department may revise the protocol as necessary to establish acceptable sampling, analysis, and measurements procedures and frequency. The department may also require that a source conduct a stack test at any emissions unit listed in this subdivision within thirty (30) days of written notification by the department.

(F) The following emissions units have been permanently shut down:

(i) The following Slab Mill Soaking Pits:

(AA) Set of nine (9) Coke Oven Gas-Fueled, Horizontally-Discharged Slab Mill Soaking Pits.

(BB) Set of twenty-three (23) Blast Furnace and Natural Gas-Fired, Horizontally-Discharged Slab Mill Soaking Pits.

(CC) Set of four (4) Blast Furnace and Natural Gas-Fired, Vertically-Discharged Slab Mill Soaking Pits.

(ii) 160 inch Plate Mill I & O Furnace No. 8.

(G) ArcelorMittal Burns Harbor LLC shall comply with the following blast furnace gas testing protocol:

(i) Conduct blast furnace gas (BFG) fuel sampling at a representative location downstream of the gas cleaning system of Blast Furnaces C and D.

(ii) Have the fuel sample analyzed for the following:

(AA) Btu content in accordance with ASTM D 3588.

(BB) Fuel composition analysis in accordance with ASTM D 1946.

(CC) Fuel sulfur analysis in accordance with ASTM D 6228.

(iii) Conduct BFG sampling:

(AA) on a quarterly basis; and

(BB) during representative performance of each blast furnace operating during the quarter (i.e., performance based on normal operating conditions).

(iv) Determine compliance by the average of at least three (3) one (1) hour integrated samples during the quarter.

(v) Fuel samples must either be:

(AA) collected in silonite-coated evacuated cylinders; or

(BB) analyzed within twelve (12) hours of being collected.

(vi) The following calculation methodology will be utilized:

The equation presumes that sulfur concentration will be measured in gr/dscf. If sulfur is measured in parts per million (ppm), the equation will require an adjustment using standard temperature and pressure (STP) defined as sixty-eight (68) degrees Fahrenheit and one (1) standard atmosphere (atm).

(vii) ArcelorMittal Burns Harbor may request the department and U.S. EPA approval of an alternative sampling or analysis methodology or alternative sampling frequency that is of equivalent accuracy as those specified in this protocol. If approved by the department and U.S. EPA, ArcelorMittal Burns Harbor may utilize the approved alternative methodology or alternative sampling frequency to demonstrate compliance with the applicable emission limits in 326 IAC 7-4-14 [this section] .

(2) Northern Indiana Public Service Company Bailly Station shall comply with the following:

(3) Midwest Steel shall comply with the following:

Only two (2) of four (4) boilers may burn fuel oil with a sulfur dioxide emission rate greater than three-tenths (0.3) pounds per million Btu at the same time. Midwest Steel shall maintain records of fuel type for each boiler for each hour. The records of fuel type shall be made available to the department upon request.

(4) Air Products and Chemical shall comply with the following:

(Office of Air Quality; 326 IAC 7-4-14 [NOTE: Under P.L. 135-2026, SECTION 53, the name of Air Pollution Control Division is changed to Office of Air Quality, effective July 1, 2026.]; filed Aug 28, 1990, 4:50 p.m.: 14 IR 78; readopted filed Jan 10, 2001, 3:20 p.m.: 24 IR 1477; errata filed Dec 12, 2002, 3:35 p.m.: 26 IR 1568; filed Sep 29, 2009, 3:00 p.m.: 20091028-IR-326070088FRA; filed Feb 18, 2021, 1:10 p.m.: 20210317-IR-326200449FRA; readopted filed Oct 18, 2024, 2:09 p.m.: 20241113-IR-326230809RFA)

326 IAC 7-4-15 326 IAC 7-4-15 Pike County sulfur dioxide emission limitations

326 IAC 7-4-15 Pike County sulfur dioxide emission limitations

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

Affected: IC 13-15; IC 13-17

Sec. 15. (a) On and after January 1, 2017, sources and emission units located in Pike County shall comply with the sulfur dioxide emission limits and other requirements, as follows:

(b) Compliance with the emission limits in subsection (a) shall be determined by using quality assured hourly average continuous emission monitoring system data, except as allowed under subsection (c).

(c) As an alternative to the emission limits in subsection (a)(1)(A) though (a)(1)(D), Indianapolis Power & Light - Petersburg Generating Station may comply with the following:

(d) Compliance with the emission limits in subsection (c) shall be determined by calculating the thirty (30) boiler operating day rolling arithmetic average emission rate at the end of each boiler operating day using all of the quality assured hourly average continuous emission monitoring system data for the previous thirty (30) boiler operating days. Boiler operating day means a twenty-four (24) hour period that begins at midnight and ends the following midnight during which any fuel is combusted at any time in the boiler. It is not necessary for the fuel to be combusted the entire twenty-four (24) hour period.

(e) Indianapolis Power & Light shall notify the department prior to the compliance date to indicate if compliance for Units 1 through 4 will be determined using the emission limits in subsection (a) or subsection (c) and prior to switching from compliance with the set of emission limits in subsection (a) to subsection (c) or from subsection (c) to subsection (a). Indianapolis Power & Light may not switch between complying with the one (1) hour average limits in subsection (a) and the thirty (30) day rolling average limits in subsection (c) unless Indianapolis Power & Light continues to show compliance with the one (1) hour average limit for each boiler until the first thirty (30) boiler operating day rolling arithmetic average emission rate is calculated.

(Office of Air Quality; 326 IAC 7-4-15 [NOTE: Under P.L. 135-2026, SECTION 53, the name of Air Pollution Control Division is changed to Office of Air Quality, effective July 1, 2026.]; filed Sep 2, 2015, 1:50 p.m.: 20150930-IR-326110356FRA; readopted filed Oct 18, 2024, 2:09 p.m.: 20241113-IR-326230809RFA)

Rule 4.1

326 IAC 7-4.1-1 326 IAC 7-4.1-1 Lake County sulfur dioxide emission limitations

Rule 4.1. Lake County Sulfur Dioxide Emission Limitations

326 IAC 7-4.1-1 Lake County sulfur dioxide emission limitations

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

Affected: IC 13-15; IC 13-17

Sec. 1. All new and existing fossil fuel-fired combustion sources and emissions units subject to 326 IAC 7-1.1 located in Lake County shall burn natural gas only unless an alternate sulfur dioxide emission limit is provided in this rule. An emissions unit subject to 326 IAC 7-1.1, but not located at a source specifically listed in this rule, may burn distillate oil with sulfur dioxide emissions limited to three-tenths (0.3) pound per million British thermal units (MMBtu) if the fuel combustion unit has a maximum capacity of less than twenty (20) MMBtu per hour actual heat input.

(Office of Air Quality; 326 IAC 7-4.1-1 [NOTE: Under P.L. 135-2026, SECTION 53, the name of Air Pollution Control Division is changed to Office of Air Quality, effective July 1, 2026.]; filed May 25, 2005, 10:50 a.m.: 28 IR 2954; readopted filed Oct 18, 2024, 2:09 p.m.: 20241113-IR-326230809RFA)

326 IAC 7-4.1-2 326 IAC 7-4.1-2 Sampling and analysis protocol

326 IAC 7-4.1-2 Sampling and analysis protocol

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

Affected: IC 13-15; IC 13-17

Sec. 2. (a) BP Products North America Inc., Cargill, Inc., Carmeuse Lime, Cokenergy, Inc., Indiana Harbor Coke Company, ISG Indiana Harbor Inc., Ispat Inland Inc., Safety-Kleen Oil Recovery Company, U.S. Steel-Gary Works, and Walsh and Kelly shall submit a sampling and analysis protocol to the department by July 1, 2006.

(b) The protocol shall:

(1) contain a description of planned procedures for:

(A) sampling of sulfur-bearing fuels and materials;

(B) analysis of the sulfur content; and

(C) any planned direct measurement of sulfur dioxide emissions vented to the atmosphere; and

(2) specify the frequency of sampling, analysis, and measurement for each fuel and material and for each emissions unit.

(c) The department shall incorporate the protocol into the source's Title V or other appropriate permit per procedures specified in 326 IAC 2. The protocol may be revised as necessary with approval by the department.

(d) The department may also require that a source listed in this section conduct a stack test at any emissions unit within sixty (60) days of written notification by the department.

(Office of Air Quality; 326 IAC 7-4.1-2 [NOTE: Under P.L. 135-2026, SECTION 53, the name of Air Pollution Control Division is changed to Office of Air Quality, effective July 1, 2026.]; filed May 25, 2005, 10:50 a.m.: 28 IR 2954; readopted filed Oct 18, 2024, 2:09 p.m.: 20241113-IR-326230809RFA)

326 IAC 7-4.1-3 326 IAC 7-4.1-3 BP Products North America Inc. sulfur dioxide emission limitations

326 IAC 7-4.1-3 BP Products North America Inc. sulfur dioxide emission limitations

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

Affected: IC 13-15; IC 13-17

Sec. 3. (a) BP Products North America Inc., Source Identification Number 00003, shall comply with the sulfur dioxide emission limits in pounds per million British thermal units (MMBtu), pounds per hour, and other requirements as follows:

(b) BP Products North America Inc. shall:

(1) maintain daily records of:

(A) fuel type, average sulfur content, and average fuel gravity for each emissions unit specified in this section with sulfur dioxide emission limitations less than or equal to four-hundredths (0.04) pound per MMBtu;

(B) calculated coke burn and sulfur content of the coke for the FCU 500 and FCU 600;

(C) total reduced sulfur concentration, hydrogen sulfide concentration, and calculated stack gas flow rate for the Beavon-Stretford Tail Gas Unit; and

(D) sulfur dioxide concentration and stack gas flow rate for the Sodium Bisulfite Tail Gas Unit; and

(2) submit a report to the department within thirty (30) days after the end of each calendar quarter containing the average daily sulfur dioxide emission rate in pounds per hour sulfur dioxide for the emissions units specified in this section, except for the Beavon-Stretford Tail Gas Unit, that is to be reported as pounds per hour total reduced sulfur calculated as sulfur dioxide.

(Office of Air Quality; 326 IAC 7-4.1-3 [NOTE: Under P.L. 135-2026, SECTION 53, the name of Air Pollution Control Division is changed to Office of Air Quality, effective July 1, 2026.]; filed May 25, 2005, 10:50 a.m.: 28 IR 2955; readopted filed Oct 18, 2024, 2:09 p.m.: 20241113-IR-326230809RFA)

326 IAC 7-4.1-4 326 IAC 7-4.1-4 Bucko Construction sulfur dioxide emission limitations

326 IAC 7-4.1-4 Bucko Construction sulfur dioxide emission limitations

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

Affected: IC 13-15; IC 13-17

Sec. 4. Bucko Construction, Source Identification Number 00179, shall comply with the sulfur dioxide emission limits for the Rotary Dryer of four-hundredths (0.04) pound per ton asphalt and ten (10) pounds per hour.

(Office of Air Quality; 326 IAC 7-4.1-4 [NOTE: Under P.L. 135-2026, SECTION 53, the name of Air Pollution Control Division is changed to Office of Air Quality, effective July 1, 2026.]; filed May 25, 2005, 10:50 a.m.: 28 IR 2956; readopted filed Oct 18, 2024, 2:09 p.m.: 20241113-IR-326230809RFA)

326 IAC 7-4.1-5 326 IAC 7-4.1-5 Cargill, Inc. sulfur dioxide emission limitations

326 IAC 7-4.1-5 Cargill, Inc. sulfur dioxide emission limitations

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

Affected: IC 13-15; IC 13-17

Sec. 5. (a) Cargill, Inc., Source Identification Number 00203, shall comply with the sulfur dioxide emission limits as follows:

(b) Cargill, Inc. shall submit a quarterly report of the twelve (12) month rolling total of all sulfur dioxide emissions in tons per year.

(Office of Air Quality; 326 IAC 7-4.1-5 [NOTE: Under P.L. 135-2026, SECTION 53, the name of Air Pollution Control Division is changed to Office of Air Quality, effective July 1, 2026.]; filed May 25, 2005, 10:50 a.m.: 28 IR 2956; filed Oct 20, 2010, 9:02 a.m.: 20101117-IR-326090476FRA; readopted filed Oct 18, 2024, 2:09 p.m.: 20241113-IR-326230809RFA)

326 IAC 7-4.1-6 326 IAC 7-4.1-6 Carmeuse Lime sulfur dioxide emission limitations

326 IAC 7-4.1-6 Carmeuse Lime sulfur dioxide emission limitations

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

Affected: IC 13-15; IC 13-17

Sec. 6. (a) Carmeuse Lime, Source Identification Number 00112, shall comply with the sulfur dioxide emission limits for Rotary Kilns 1 through 5 as follows:

(1) When three (3) or fewer kilns are in operation at the same time, the sulfur dioxide emissions are not to exceed:

(A) two and ninety-four thousandths (2.094) pounds per ton of lime based on a one (1) hour average; and

(B) forty-eight (48) pounds per hour per operating kiln.

(2) When four (4) kilns are in operation at the same time, the sulfur dioxide emissions are not to exceed:

(A) one and seven hundred forty-five thousandths (1.745) pounds per ton of lime based on a one (1) hour average; and

(B) forty (40) pounds per hour per operating kiln.

(3) When five (5) kilns are in operation at the same time, the sulfur dioxide emissions are not to exceed:

(A) one and four hundred eighty-three thousandths (1.483) pounds per ton of lime based on a one (1) hour average; and

(B) thirty-four (34) pounds per hour per operating kiln.

(4) The production of lime is not to exceed five hundred fifty (550) tons per day for each rotary kiln.

(b) Sulfur dioxide emissions shall be vented from the kilns/kiln gas filter systems at the following heights above grade:

(1) For Kiln No. 1, a stack height of seventy-nine and one-tenth (79.1) feet.

(2) For Kiln No. 2, a stack height of eighty-five and nine-tenths (85.9) feet.

(3) For Kiln No. 3, a stack height of eighty-six and zero-tenths (86.0) feet.

(4) For Kiln No. 4, a stack height of ninety-four and four-tenths (94.4) feet.

(5) For Kiln No. 5, a stack height of eighty-seven and four-tenths (87.4) feet.

(Office of Air Quality; 326 IAC 7-4.1-6 [NOTE: Under P.L. 135-2026, SECTION 53, the name of Air Pollution Control Division is changed to Office of Air Quality, effective July 1, 2026.]; filed May 25, 2005, 10:50 a.m.: 28 IR 2956; readopted filed Oct 18, 2024, 2:09 p.m.: 20241113-IR-326230809RFA)

326 IAC 7-4.1-7 326 IAC 7-4.1-7 Cokenergy LLC sulfur dioxide emission limitations

326 IAC 7-4.1-7 Cokenergy LLC sulfur dioxide emission limitations

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

Affected: IC 13-15; IC 13-17

Sec. 7. (a) Cokenergy LLC, Source Identification Number 00383, shall comply with the sulfur dioxide emission limit in pounds per hour for the heat recovery coke carbonization waste gas stack, identified as Stack ID 201, combined with the sixteen (16) vents from the Indiana Harbor Coke Company of a twenty-four (24) hour average emission rate of one thousand six hundred fifty-six (1,656) pounds per hour.

(b) Cokenergy LLC shall install, operate, and maintain a permanent flow monitor to continuously measure the flow rate in Stack ID 201.

(c) Except under subsection (d), beginning on January 1, 2020, Cokenergy LLC in combination with Indiana Harbor Coke Company may vent a maximum of thirteen percent (13%) of the coke oven waste gases leaving the common tunnel to the atmosphere through the bypass vent stacks, as determined on an annual basis.

(d) Beginning on January 1, 2020, if Cokenergy LLC undertakes heat recovery steam generator (HRSG) retubing, as defined in subsection (e), then the following apply:

(1) Cokenergy LLC in combination with Indiana Harbor Coke Company may vent a maximum of fourteen percent (14%) of the coke oven waste gases leaving the common tunnel to the atmosphere through the bypass vent stacks, as determined:

(A) on an annual basis; and

(B) in any calendar year that Cokenergy LLC undertakes HRSG retubing.

(2) The bypass venting percentage resulting from HRSG retubing must account for at least three and one-quarter percent (3.25%) of the annual bypass venting.

(3) Bypass venting resulting from tube leaks, inspections, routine cleaning or maintenance, or unplanned HRSG outages may not be included in calculating the bypass venting percentage resulting from HRSG retubing.

(e) For the purposes of this section and section 8 of this rule, "heat recovery steam generator retubing" or "HRSG retubing" means replacement of:

(1) waterwalls, evaporator tubes, economizer tubes, or superheater module pendants within the heat recovery steam generator; and

(2) exterior casing, insulation, and refractory, as needed.

(Office of Air Quality; 326 IAC 7-4.1-7 [NOTE: Under P.L. 135-2026, SECTION 53, the name of Air Pollution Control Division is changed to Office of Air Quality, effective July 1, 2026.]; filed May 25, 2005, 10:50 a.m.: 28 IR 2957; filed Apr 24, 2020, 4:26 p.m.: 20200429-IR-326190388FRA, eff Apr 24, 2020, see Executive Order 20-15, posted at 20200422-IR-GOV200234EOA; readopted filed Oct 18, 2024, 2:09 p.m.: 20241113-IR-326230809RFA)

326 IAC 7-4.1-8 326 IAC 7-4.1-8 Indiana Harbor Coke Company sulfur dioxide emission limitations

326 IAC 7-4.1-8 Indiana Harbor Coke Company sulfur dioxide emission limitations

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

Affected: IC 13-15; IC 13-17

Sec. 8. (a) Indiana Harbor Coke Company (IHCC), Source Identification Number 00382, shall comply with the sulfur dioxide emission limits in pounds per ton of dry coal, pounds per hour, and other requirements as follows:

(b) The coke ovens must recycle the gases emitted during the coking process in accordance with the following:

(1) The recycled gases must be the only fuel source used for the ovens during normal operations.

(2) The gases must not be routed directly to the atmosphere unless they first pass through the common tunnel afterburner.

(3) A maximum of nineteen percent (19%) of the coke oven waste gases leaving the common tunnel may be vented to the atmosphere on a twenty-four (24) hour basis.

(c) Except under subsection (d), beginning on January 1, 2020, Indiana Harbor Coke Company in combination with Cokenergy LLC may vent a maximum of thirteen percent (13%) of the coke oven waste gases leaving the common tunnel to the atmosphere through the bypass vent stacks, as determined on an annual basis.

(d) Beginning on January 1, 2020, if Cokenergy LLC undertakes HRSG retubing, as defined in section 7(e) of this rule, then the following apply:

(1) Indiana Harbor Coke Company in combination with Cokenergy LLC may vent a maximum of fourteen percent (14%) of the coke oven waste gases leaving the common tunnel to the atmosphere through the bypass vent stacks, as determined:

(A) on an annual basis; and

(B) in any calendar year that Cokenergy LLC undertakes HRSG retubing.

(2) The bypass venting percentage resulting from HRSG retubing must account for at least three and one-quarter percent (3.25%) of the annual bypass venting.

(3) Bypass venting resulting from tube leaks, inspections, routine cleaning or maintenance, or unplanned HRSG outages may not be included in calculating the bypass venting percentage resulting from HRSG retubing.

(Office of Air Quality; 326 IAC 7-4.1-8 [NOTE: Under P.L. 135-2026, SECTION 53, the name of Air Pollution Control Division is changed to Office of Air Quality, effective July 1, 2026.]; filed May 25, 2005, 10:50 a.m.: 28 IR 2957; filed Apr 24, 2020, 4:26 p.m.: 20200429-IR-326190388FRA, eff Apr 24, 2020, see Executive Order 20-15, posted at 20200422-IR-GOV200234EOA; readopted filed Oct 18, 2024, 2:09 p.m.: 20241113-IR-326230809RFA)

326 IAC 7-4.1-9 326 IAC 7-4.1-9 Ironside Energy, LLC sulfur dioxide emission limitations

326 IAC 7-4.1-9 Ironside Energy, LLC sulfur dioxide emission limitations

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

Affected: IC 13-15; IC 13-17

Sec. 9. (a) Ironside Energy, LLC, Source Identification Number 00448, shall comply with the sulfur dioxide emission limits for Utility Boiler No. 9 of two hundred ninety-thousandths (0.290) pound per million British thermal units (MMBtu) and one hundred ninety and fifty-three hundredths (190.53) pounds per hour. Utility Boiler No. 9 shall be fired on blast furnace gas and natural gas only.

(b) Utility Boiler No. 9 in combination with ISG Indiana Harbor Inc. Utility Boilers 5, 6, 7, and 8 are limited to an annual operating limit of five thousand eight hundred seventy-one and sixty-one hundredths (5,871.61) tons per year.

(c) For Utility Boiler No. 9, Ironside Energy, LLC shall:

(1) maintain records of the:

(A) total blast furnace gas and natural gas combusted for each day; and

(B) average sulfur content and heating value for each day for each fuel type combusted during the calendar quarter; and

(2) submit to the department within thirty (30) days of the end of each calendar quarter the calculated sulfur dioxide emission rate in pounds per MMBtu for each fuel type, the total fuel combusted for each day during the calendar quarter.

(Office of Air Quality; 326 IAC 7-4.1-9 [NOTE: Under P.L. 135-2026, SECTION 53, the name of Air Pollution Control Division is changed to Office of Air Quality, effective July 1, 2026.]; filed May 25, 2005, 10:50 a.m.: 28 IR 2957; readopted filed Oct 18, 2024, 2:09 p.m.: 20241113-IR-326230809RFA)

326 IAC 7-4.1-10 326 IAC 7-4.1-10 ArcelorMittal USA LLC (Indiana Harbor West) sulfur dioxide emission limitations

326 IAC 7-4.1-10 ArcelorMittal USA LLC (Indiana Harbor West) sulfur dioxide emission limitations

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

Affected: IC 13-15; IC 13-17

Sec. 10. (a) ArcelorMittal USA LLC (Indiana Harbor West), Source Identification Number 00318, shall comply with the sulfur dioxide emission limits in pounds per million British thermal units (MMBtu), pounds per hour, and other requirements as follows:

(b) ISG ArcelorMittal USA LLC (Indiana Harbor West), shall:

(1) maintain records of the:

(A) total coke oven gas, blast furnace gas, fuel oil, and natural gas usage for each day at each emissions unit listed in subsection (a)(1) through (a)(2); and

(B) average sulfur content and heating value for each day for each fuel type used during the calendar quarter; and

(2) submit to the department within thirty (30) days of the end of each calendar quarter the calculated sulfur dioxide emission rate in pounds per MMBtu for each emissions unit for each day during the calendar quarter and the total fuel usage for each type at each emissions unit for each day.

(Office of Air Quality; 326 IAC 7-4.1-10 [NOTE: Under P.L. 135-2026, SECTION 53, the name of Air Pollution Control Division is changed to Office of Air Quality, effective July 1, 2026.]; filed May 25, 2005, 10:50 a.m.: 28 IR 2958; filed Feb 18, 2021, 1:10 p.m.: 20210317-IR-326200449FRA; readopted filed Oct 18, 2024, 2:09 p.m.: 20241113-IR-326230809RFA)

326 IAC 7-4.1-11 326 IAC 7-4.1-11 ArcelorMittal USA LLC (Indiana Harbor East) sulfur dioxide emission limitations

326 IAC 7-4.1-11 ArcelorMittal USA LLC (Indiana Harbor East) sulfur dioxide emission limitations

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

Affected: IC 13-15; IC 13-17

Sec. 11. (a) ArcelorMittal USA LLC (Indiana Harbor East), Source Identification Number 00316, shall comply with the sulfur dioxide emission limits in pounds per million British thermal units (MMBtu), pounds per ton, pounds per hour, and other requirements as follows:

(b) ArcelorMittal USA LLC (Indiana Harbor East) shall:

(1) maintain records of the:

(A) total blast furnace gas, fuel oil, and natural gas usage for each day at each emissions unit listed in this section; and

(B) average sulfur content and heating value for each day for each fuel type used during the calendar quarter;

(C) hourly sulfur dioxide emission rate in pounds of sulfur dioxide per hour calculated by dividing the total daily sulfur dioxide emissions in pounds of sulfur dioxide per day by twenty-four (24) hours; and

(D) hourly sulfur dioxide emission rate in pounds of sulfur dioxide per MMBtu or per ton for emissions units with a pounds of sulfur dioxide per MMBtu limit in this rule calculated by dividing the total daily sulfur dioxide emissions in pounds of sulfur dioxide per day by the total heat input per day in MMBtu or by the total tons per day, respectively.

(2) submit to the department within thirty (30) days of the end of each calendar quarter the calculated sulfur dioxide emission rate in pounds per million Btu and pounds per hour for each emissions unit for each day during the calendar quarter, the total fuel usage for each type of fuel used at each emissions unit for each day.

(Office of Air Quality; 326 IAC 7-4.1-11 [NOTE: Under P.L. 135-2026, SECTION 53, the name of Air Pollution Control Division is changed to Office of Air Quality, effective July 1, 2026.]; filed May 25, 2005, 10:50 a.m.: 28 IR 2958; filed Feb 18, 2021, 1:10 p.m.: 20210317-IR-326200449FRA; readopted filed Oct 18, 2024, 2:09 p.m.: 20241113-IR-326230809RFA)

326 IAC 7-4.1-12 326 IAC 7-4.1-12 Methodist Hospital sulfur dioxide emission limitations

326 IAC 7-4.1-12 Methodist Hospital sulfur dioxide emission limitations

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

Affected: IC 13-15; IC 13-17

Sec. 12. Methodist Hospital, Source Identification Number 00114, shall comply with the sulfur dioxide emission limits for Boiler 1 of one hundred fifty-two thousandths (0.152) pound per million British thermal units and four and eight hundred sixty-four thousandths (4.864) pounds per hour.

(Office of Air Quality; 326 IAC 7-4.1-12 [NOTE: Under P.L. 135-2026, SECTION 53, the name of Air Pollution Control Division is changed to Office of Air Quality, effective July 1, 2026.]; filed May 25, 2005, 10:50 a.m.: 28 IR 2959; readopted filed Oct 18, 2024, 2:09 p.m.: 20241113-IR-326230809RFA)

326 IAC 7-4.1-13 326 IAC 7-4.1-13 National Recovery Systems sulfur dioxide emission limitations

326 IAC 7-4.1-13 National Recovery Systems sulfur dioxide emission limitations

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

Affected: IC 13-15; IC 13-17

Sec. 13. National Recovery Systems, Source Identification Number 00323, shall comply with the sulfur dioxide emission limits for the dryer of three-tenths (0.3) pound per million British thermal units and two and seven hundred-thousandths (2.700) pounds per hour.

(Office of Air Quality; 326 IAC 7-4.1-13 [NOTE: Under P.L. 135-2026, SECTION 53, the name of Air Pollution Control Division is changed to Office of Air Quality, effective July 1, 2026.]; filed May 25, 2005, 10:50 a.m.: 28 IR 2959; readopted filed Oct 18, 2024, 2:09 p.m.: 20241113-IR-326230809RFA)

326 IAC 7-4.1-14 326 IAC 7-4.1-14 NIPSCO Dean H. Mitchell Generating Station sulfur dioxide emission limitations

326 IAC 7-4.1-14 NIPSCO Dean H. Mitchell Generating Station sulfur dioxide emission limitations

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

Affected: IC 13-15; IC 13-17

Sec. 14. (a) NIPSCO Dean H. Mitchell Generating Station, Source Identification Number 00117, shall comply with the sulfur dioxide emission limits for Boilers 4, 5, 6, and 11 in pounds per million British thermal units (MMBtu), pounds per hour, and other requirements as follows:

(1) Operation under either subdivision (2)(B) or (2)(C) shall only be allowed provided that a nozzle is in the stack serving Boilers 4 and 5 such that the stack diameter is restricted to eight and three-tenths (8.3) feet.

(2) Sulfur dioxide emissions for boilers operating under the scenarios listed in this subdivision shall be measured as a daily weighted average by the continuous emissions monitoring systems (CEMS) required in subsection (b)(2). NIPSCO Dean H. Mitchell Generating Station may operate under any one (1) of the following scenarios:

(A) Boilers 4, 5, 6, and 11 may operate simultaneously under the following conditions:

(i) One (1) of Boiler 4 or 5 may operate on coal if the other boiler is operated on natural gas or is not operating. Sulfur dioxide emissions from the stack serving Boilers 4 and 5 shall be limited to one and five-hundredths (1.05) pounds per MMBtu and one thousand three hundred thirteen (1,313.0) pounds per hour.

(ii) Boilers 6 and 11 may operate simultaneously on coal. Sulfur dioxide emissions from the stack serving Boilers 6 and 11 shall be limited to one and five-hundredths (1.05) pound per MMBtu and two thousand four hundred seventy-five (2,475.0) pounds per hour.

(B) Boilers 4, 5, 6, and 11 may operate simultaneously on coal subject to the following conditions:

(i) Sulfur dioxide emissions from the stack serving Boilers 4 and 5 shall be limited to seventy-seven hundredths (0.77) pound per MMBtu and one thousand nine hundred twenty-five (1,925.0) pounds per hour.

(ii) Sulfur dioxide emissions from the stack serving Boilers 6 and 11 shall be limited to seventy-seven hundredths (0.77) pound per MMBtu and one thousand eight hundred fifteen (1,815.0) pounds per hour.

(C) One (1) set of either Boilers 4 and 5 or 6 and 11 may operate on coal if the other set is not operating, subject to the following conditions:

(i) Sulfur dioxide emissions from the stack serving Boilers 4 and 5 shall be limited to one and five-hundredths (1.05) pounds per MMBtu and two thousand six hundred twenty-five (2,625.0) pounds per hour.

(ii) Sulfur dioxide emissions from the stack serving Boilers 6 and 11 shall be limited to one and five-hundredths (1.05) pounds per MMBtu and two thousand four hundred seventy-five (2,475.0) pounds per hour.

(3) NIPSCO Dean H. Mitchell Generating Station shall maintain a daily log of the following for Boilers 4, 5, 6, and 11:

(A) Fuel type.

(B) Transition time of changes between or within operating scenarios.

The log shall be maintained for a minimum of five (5) years and shall be made available to the department and U.S. EPA upon request.

(4) Emission limits shall be maintained during transition periods within or between operating scenarios.

(b) NIPSCO Dean H. Mitchell Generating Station shall comply with the following:

(1) The diameter of the stack serving Boilers 6 and 11 shall be restricted to eight and three-tenths (8.3) feet.

(2) Beginning May 31, 1992, NIPSCO Dean H. Mitchell Generating Station shall maintain and operate CEMS in the stacks serving Boilers 4, 5, 6, and 11. The CEMS shall be operated in accordance with the procedures specified in 326 IAC 3-4 and 326 IAC 3-5, with the exception of the three (3) hour block period reporting requirements under 326 IAC 3-5-7. Records of daily average emissions data shall be:

(A) maintained for a minimum of five (5) years; and

(B) made available to the department and U.S. EPA upon request.

(3) NIPSCO Dean H. Mitchell Generating Station shall submit a written report to the department within thirty (30) days after the end of each calendar quarter. The report shall contain the daily weighted average emission rate in units of pounds per MMBtu as measured by the CEMS for each stack venting emissions from those boilers specified in subdivision (2). The hourly gross megawatt power production from the units connected to each stack may be used as the weighting factor in determining the daily weighted average. Records of the hourly gross megawatt power production shall be:

(A) maintained for a minimum of five (5) years; and

(B) made available to the department and U.S. EPA upon request.

(Office of Air Quality; 326 IAC 7-4.1-14 [NOTE: Under P.L. 135-2026, SECTION 53, the name of Air Pollution Control Division is changed to Office of Air Quality, effective July 1, 2026.]; filed May 25, 2005, 10:50 a.m.: 28 IR 2960; readopted filed Oct 18, 2024, 2:09 p.m.: 20241113-IR-326230809RFA)

326 IAC 7-4.1-15 326 IAC 7-4.1-15 Rhodia sulfur dioxide emission limitations

326 IAC 7-4.1-15 Rhodia sulfur dioxide emission limitations

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

Affected: IC 13-15; IC 13-17

Sec. 15. (a) Rhodia, Source Identification Number 00242, shall comply with the sulfur dioxide emission limit for the Spent Acid Regeneration Unit 4 of seven hundred eighty-two (782) pounds per hour.

(b) Rhodia shall operate a continuous emission monitoring system (CEMS) in each stack serving Unit 4. Rhodia shall submit a report to the department within thirty (30) days after the end of each calendar quarter. The report shall contain the following information:

(1) Three (3) hour average sulfur dioxide emission rate in pounds per hour as measured by the CEMS from Unit 4 for each three (3) hour period during the calendar quarter in which the average emissions exceed the allowable rates specified in subsection (a).

(2) The daily average emission rate in units of pounds per ton as determined from CEMS and production data for Unit 4 for each day of the calendar quarter.

(Office of Air Quality; 326 IAC 7-4.1-15 [NOTE: Under P.L. 135-2026, SECTION 53, the name of Air Pollution Control Division is changed to Office of Air Quality, effective July 1, 2026.]; filed May 25, 2005, 10:50 a.m.: 28 IR 2960; readopted filed Oct 18, 2024, 2:09 p.m.: 20241113-IR-326230809RFA)

326 IAC 7-4.1-16 326 IAC 7-4.1-16 Safety-Kleen Oil Recovery Company sulfur dioxide emission limitations

326 IAC 7-4.1-16 Safety-Kleen Oil Recovery Company sulfur dioxide emission limitations

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

Affected: IC 13-15; IC 13-17

Sec. 16. Safety-Kleen Oil Recovery Company, Source Identification Number 00301, shall comply with the sulfur dioxide emission limits in pounds per hour and other requirements as follows:

(1) Boilers SB-820, SB-823, and SB-822, and Process Heaters H-302 and H-404, must use natural gas only.

(2) Process Heater H-201, with a capacity of twenty-seven and three-tenths (27.3) MMBtu per hour, must use a combination of natural gas, No. 2 fuel oil equivalent, and off-gases. Process Heater H-301, with a capacity of twenty and zero-tenths (20.0) MMBtu per hour, must use a combination of natural gas and No. 2 fuel oil equivalent. The combined sulfur dioxide emissions from these two (2) process heaters must not exceed fourteen (14) pounds per hour and sixty (60) tons per year.

(3) Process Heater H-401, with a capacity of fifteen and three-tenths (15.3) MMBtu per hour, must use a combination of natural gas, No. 2 fuel oil equivalent, and off-gases. Process Heater H-402, with a capacity of eleven and seven-tenths (11.7) MMBtu per hour, must use a combination of natural gas and No. 2 fuel oil equivalent. The combined sulfur dioxide emissions from these two (2) process heaters must not exceed ten and eight-tenths (10.8) pounds per hour and forty-seven and three-tenths (47.3) tons per year.

(4) Process Heater H-406, with a capacity of twenty and zero-tenths (20.0) MMBtu per hour, must use a combination of natural gas and off-gas from vessel V-423. The sulfur dioxide emissions must not exceed eight (8) pounds per hour.

(5) Safety-Kleen shall demonstrate compliance through monitoring as follows:

(A) Monitor sulfur content in the off-gas streams for Process Heater H-406.

(B) Install and operate sulfur dioxide CEMS on the stacks for Process Heaters H-201 and H-401. The CEMS must be installed, calibrated, operated, and maintained in accordance with 326 IAC 3-5.

(C) Conduct fuel sampling for heat input and sulfur content and measure the quantity of fuel oil burned in order to calculate the SO2 emission rate for Process Heaters H-201, H-301, H-401, and H-402.

(D) Prior to sampling the fuel in the fuel tank, mix the contents of the tank to ensure consistent composition of the fuel throughout the tank.

(E) Perform fuel sampling and analysis for the sulfur content of the fuel in each fuel tank:

(i) prior to the first time the fuel is burned; and

(ii) subsequently, prior to burning the fuel whenever additional fuel has been added to the tank since the last sampling event.

(F) Maintain records sufficient to demonstrate compliance for at least three (3) years.

(G) Submit an excess emissions report to the department within thirty (30) days after the end of each calendar quarter.

(Office of Air Quality; 326 IAC 7-4.1-16 [NOTE: Under P.L. 135-2026, SECTION 53, the name of Air Pollution Control Division is changed to Office of Air Quality, effective July 1, 2026.]; filed May 25, 2005, 10:50 a.m.: 28 IR 2961; filed Aug 11, 2023, 9:11 a.m.: 20230906-IR-326220038FRA; readopted filed Oct 18, 2024, 2:09 p.m.: 20241113-IR-326230809RFA)

326 IAC 7-4.1-17 326 IAC 7-4.1-17 SCA Tissue North America LLC sulfur dioxide emission limitations

326 IAC 7-4.1-17 SCA Tissue North America LLC sulfur dioxide emission limitations

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

Affected: IC 13-15; IC 13-17

Sec. 17. SCA Tissue North America LLC, Source Identification Number 00106, shall comply with the sulfur dioxide emission limits for Boiler 1 of one and two-tenths (1.2) pounds per million British thermal units and eighty-seven and twenty-four hundredths (87.24) pounds per hour.

(Office of Air Quality; 326 IAC 7-4.1-17 [NOTE: Under P.L. 135-2026, SECTION 53, the name of Air Pollution Control Division is changed to Office of Air Quality, effective July 1, 2026.]; filed May 25, 2005, 10:50 a.m.: 28 IR 2962; readopted filed Oct 18, 2024, 2:09 p.m.: 20241113-IR-326230809RFA)

326 IAC 7-4.1-18 326 IAC 7-4.1-18 State Line Energy, LLC sulfur dioxide emission limitations

326 IAC 7-4.1-18 State Line Energy, LLC sulfur dioxide emission limitations

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

Affected: IC 13-15; IC 13-17

Sec. 18. State Line Energy, LLC, Source Identification Number 00210, shall comply with the sulfur dioxide emission limits in pounds per million British thermal units (MMBtu) and pounds per hour as follows:

(1) The Auxiliary Emergency Generator shall be limited to three-tenths (0.3) pound per MMBtu and one and thirty-five hundredths (1.35) pounds per hour.

(2) Boiler 3 shall be limited to one and two-tenths (1.2) pounds per MMBtu and two thousand five hundred fifty-six (2,556) pounds per hour.

(3) Boiler 4 shall be limited to one and two-tenths (1.2) pounds per MMBtu and four thousand fifty-four and eight-tenths (4,054.8) pounds per hour.

(Office of Air Quality; 326 IAC 7-4.1-18 [NOTE: Under P.L. 135-2026, SECTION 53, the name of Air Pollution Control Division is changed to Office of Air Quality, effective July 1, 2026.]; filed May 25, 2005, 10:50 a.m.: 28 IR 2962; readopted filed Oct 18, 2024, 2:09 p.m.: 20241113-IR-326230809RFA)

326 IAC 7-4.1-19 326 IAC 7-4.1-19 Unilever HPC USA sulfur dioxide emission limitations

326 IAC 7-4.1-19 Unilever HPC USA sulfur dioxide emission limitations

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

Affected: IC 13-15; IC 13-17

Sec. 19. Unilever HPC USA, Source Identification Number 00229, shall comply with the sulfur dioxide emission limits in pounds per million British thermal units (MMBtu), hours per year, and pounds per hour as follows:

(1) Boiler 4 shall be limited to one and fifty-two hundredths (1.52) pounds per MMBtu and one hundred twenty-five and three-tenths (125.3) pounds per hour.

(2) Power House Boiler No. 1 shall be limited to five-tenths (0.5) pounds per MMBtu and sixty (60) pounds per hour for a total of six hundred ninety-five (695) hours per year at full capacity.

(3) American Hydrotherm Boiler No. 2 shall be limited to three-tenths (0.3) pound per MMBtu and three and sixty-six hundredths (3.66) pounds per hour.

(Office of Air Quality; 326 IAC 7-4.1-19 [NOTE: Under P.L. 135-2026, SECTION 53, the name of Air Pollution Control Division is changed to Office of Air Quality, effective July 1, 2026.]; filed May 25, 2005, 10:50 a.m.: 28 IR 2962; readopted filed Oct 18, 2024, 2:09 p.m.: 20241113-IR-326230809RFA)

326 IAC 7-4.1-20 326 IAC 7-4.1-20 U.S. Steel-Gary Works sulfur dioxide emission limitations

326 IAC 7-4.1-20 U.S. Steel-Gary Works sulfur dioxide emission limitations

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

Affected: IC 13-15; IC 13-17

Sec. 20. (a) U.S. Steel-Gary Works, Source Identification Number 00121, shall comply with the following sulfur dioxide emission limitations in pounds per million British thermal units (MMBtu) and pounds per hour:

(b) U.S. Steel-Gary Works shall comply with additional sulfur dioxide emission requirements as follows:

(1) U.S. Steel-Gary Works shall record and make available to IDEM, upon request, process and fuel use information pertaining to each emissions unit, process, or combustion unit identified in this section, including the following:

(A) Identification of the applicable limit.

(B) The amount and type of each fuel used for each emissions unit for each calendar day of operation.

(C) The operating scenario chosen for the U.S. Steel-Gary Works.

(D) The hourly sulfur dioxide emission rate in pounds of sulfur dioxide per hour calculated by dividing the total daily sulfur dioxide emissions in pounds of sulfur dioxide per day by twenty-four (24) hours.

(E) The hourly sulfur dioxide emission rate in pounds of sulfur dioxide per MMBtu for those emissions units with a pounds of sulfur dioxide per MMBtu limit in this rule calculated by dividing the total daily sulfur dioxide emissions in pounds of sulfur dioxide per day by the total heat input per day in MMBtu.

(2) U.S. Steel-Gary Works shall submit an exception report to the department within thirty (30) days of an exceedance of the limitations in this section that includes the following:

(A) Identification of the applicable limit or limits being exceeded.

(B) Identification of any emissions unit exceeding the applicable limit and the dates when the limits were exceeded.

(C) The calculated sulfur dioxide emission rate in pounds per hour for each emissions unit exceeding the limitations for the days that the pounds per hour limitations were exceeded.

(D) The calculated sulfur dioxide emission rate in pounds per MMBtu for each combustion unit, furnace, boiler, or process operation for each emissions unit exceeding the pounds per MMBtu limitations for the days that the limitations were exceeded.

(E) The actual daily fuel usage for each combustion unit, furnace, boiler, or process operation for each emissions unit exceeding the limitations for the days that the limitations were exceeded.

(3) An emission unit must burn natural gas only:

(A) if it is not listed in this rule; or

(B) under any operating condition not specifically listed in this rule.

(Office of Air Quality; 326 IAC 7-4.1-20 [NOTE: Under P.L. 135-2026, SECTION 53, the name of Air Pollution Control Division is changed to Office of Air Quality, effective July 1, 2026.]; filed May 25, 2005, 10:50 a.m.: 28 IR 2962; filed Jan 22, 2018, 3:45 p.m.: 20180221-IR-326170282FRA; readopted filed Oct 18, 2024, 2:09 p.m.: 20241113-IR-326230809RFA)

326 IAC 7-4.1-21 326 IAC 7-4.1-21 Walsh and Kelly sulfur dioxide emission limitations

326 IAC 7-4.1-21 Walsh and Kelly sulfur dioxide emission limitations

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

Affected: IC 13-15; IC 13-17

Sec. 21. (a) Walsh and Kelly, Source Identification Number 03215, shall comply with the sulfur dioxide emission limits for the aggregate dryer of less than:

(1) twenty-five (25) tons per year; and

(2) forty-two (42) pounds per hour.

(b) The input of re-refined waste oil and its calculated #2 fuel oil equivalents in the one hundred fifteen (115) million British thermal units (MMBtu) per hour burner for the aggregate dryer shall be limited to less than seven hundred forty thousand seven hundred twenty-five (740,725) gallons per twelve (12) consecutive month period, rolled on a monthly basis, based on maximum sulfur content of forty-five hundredths percent (0.45%) for re-refined waste oil.

(Office of Air Quality; 326 IAC 7-4.1-21 [NOTE: Under P.L. 135-2026, SECTION 53, the name of Air Pollution Control Division is changed to Office of Air Quality, effective July 1, 2026.]; filed May 25, 2005, 10:50 a.m.: 28 IR 2965; filed Apr 29, 2015, 3:30 p.m.: 20150527-IR-326140256FRA; readopted filed Oct 18, 2024, 2:09 p.m.: 20241113-IR-326230809RFA)