in-20250409-IR-326250204FNA: The Indiana Department of Environmental Management (IDEM) is soliciting public comment on adding rules at 326 IAC 10-7 concerning reasonably available control technology (RACT) requirements for nitrogen oxides (NOx) emissions in portions of Lake and Porter Counties. Specifically, this rulemaking would apply to Calumet, Hobart, North, Ross, and St. John Townships in Lake County and Center, Jackson, Liberty, Pine, Portage, Union, Washington, and Westchester Townships in Porter County. IDEM seeks comment on the affected citations listed and any other provisions of Title 326 that may be affected by this rulemaking.

Notice of First Public Comment Period LSA Document #25-204 Sec. 1. (a) Unless exempted under section 7 of this rule, the requirements of this rule apply to any facility that emits NOx in Calumet, Hobart, North, Ross, or St. John Townships in Lake County, or Center, Jackson, Liberty, Pine, Portage, Union, Washington, or Westchester Townships in Porter County that meets the following conditions: (b) Any new or modified emission unit in Calumet, Hobart, North, Ross, or St. John Townships in Lake County, or Center, Jackson, Liberty, Pine, Portage, Union, Washington, and Westchester Townships in Porter County subject to the requirements of this rule unless the emissions limitations and requirements of an applicable new source performance standard under 40 CFR Part 60* is more stringent than the emissions limitations and requirements of this rule. (c) Any existing emission unit in Calumet, Hobart, North, Ross, or St. John Townships in Lake County, or Center, Jackson, Liberty, Pine, Portage, Union, Washington, and Westchester Townships in Porter County that no longer meets an applicable exemption under section 7 of this rule immediately becomes subject to the requirements of this rule. *These documents are incorporated by reference. Copies may be obtained from the Government Publishing Office, www.gpo.gov, or are available for review at the Indiana Department of Environmental Management, Office of Legal Counsel, Indiana Government Center North, 100 North Senate Avenue, Thirteenth Floor, Indianapolis, IN 46204. Sec. 2. The following definitions, and the definitions found in IC 13-11-2 and 326 IAC 1-2, apply to this rule: *These documents are incorporated by reference. Copies may be obtained from the Government Publishing Office, www.gpo.gov, or are available for review at the Indiana Department of Environmental Management, Office of Legal Counsel, Indiana Government Center North, 100 North Senate Avenue, Thirteenth Floor, Indianapolis, IN 46204. Sec. 3. (a) Compliance with the emissions limitations specified in this rule shall be based on one or more of the following: (b) The twelve (12) consecutive month period is determined at the end of each month. (c) The owner or operator shall perform a tune-up of any unit no later than thirty (30) days after determining that the unit burned less than ninety percent (90%) blast furnace gas in a twelve (12) consecutive month period. If a unit has a continuous oxygen trim system and had a tune-up within three (3) years before a twelve (12) consecutive month period during which the unit burned ninety percent (90%) or more blast furnace gas by volume, the owner or operator must perform a subsequent tune-up no later than: Sec. 4. (a) Owners or operators of small boilers shall: (b) Owners or operators of mid-size, large, and very large boilers shall not emit NOx in excess of the following: (c) Unless a more stringent limit is included in a permit, owners or operators of stationary combustion turbines for mechanical drive and electrical generation shall not emit NOx in excess of the following: Table 1 – NOx Emissions Limitations for Stationary Combustion Turbines (d) Unless a more stringent limit is included in a permit, owners or operators of stationary internal combustion engines shall not emit NOx in excess of the following: Table 2 – NOx Emissions Limitations for Stationary RICE (e) Unless a more stringent limit is included in a permit, owners or operators of reheat, annealing, and galvanizing furnaces with a maximum heat input capacity of equal or greater than seventy-five (75) mmBtu/hr shall not emit NOx in excess of 0.09 lb/mmBtu. Sec. 5. (a) The owner or operator of an affected source may propose an emission averaging program in lieu of the applicable emissions limitations. Both affected facilities and non-affected facilities may be utilized in the averaging program. (b) Any proposed emission averaging program shall comply with the following requirements: (c) Any emission averaging program approved by the department shall be submitted to and approved by U.S. EPA as a revision of the Indiana state implementation plan. An emission averaging program shall not be federally enforceable until U.S. EPA approves the program as part of the Indiana state implementation plan. Sec. 6. (a) Any affected facility that is: (b) The study required by subsection (a) shall determine the economic and technical feasibility of reducing NOx emissions and define RACT for the facility. The engineering study shall be conducted by an engineering consulting firm or other person or persons experienced in the field of air pollution control, and provide the following information: (c) Any facility that is subject to an emissions limitation contained in section 4 of this rule shall no longer be subject to the emissions limitations if the department approves a definition of RACT and a schedule of compliance for the facility pursuant to this section. (d) Any facility that is subject to an emissions limitation contained in section 4 of this rule shall remain subject to those limitations and compliance deadlines contained in section 9 if: (e) If within the five years prior to the effective date of this rule, the owner or operator of an affected facility subject to this rule has employed, or has committed to employ, the best available control technology for NOx emissions, as determined by the department pursuant to 326 IAC 2-2, the owner or operator may provide the following information to the department in satisfaction of section 5 of this rule: (f) If the department determines that the information provided by an affected facility under subsection (e) of this section does not or may not satisfy the requirements of this rule, the department shall notify the owner or operator. After being notified by the department, the owner or operator must then conduct a full RACT engineering study in accordance with section 6 of this rule. (g) Any definition of RACT and schedule of compliance for an affected facility that are approved by the department shall be submitted to the U.S. EPA as a revision of the Indiana state implementation plan. (h) If any unit with a specific emission limit in section 8 of this rule based on actual annual emissions cannot meet that limit, the owner or operator must conduct a new RACT engineering study based on the potential to emit (PTE) and propose revised RACT requirements based on the new study within six (6) months of the determination of noncompliance. *These documents are incorporated by reference. Copies may be obtained from the Government Publishing Office, www.gpo.gov, or are available for review at the Indiana Department of Environmental Management, Office of Legal Counsel, Indiana Government Center North, 100 North Senate Avenue, Thirteenth Floor, Indianapolis, IN 46204. Sec. 7. (a) The requirements of this rule shall not apply to the following: (b) The owner or operator of any affected facility that cannot comply with the applicable requirements set forth in this rule because of extraordinary reasons beyond the affected source's reasonable control may apply in writing to the department to request a variance. The variance application shall be prepared in accordance with the provisions specified in IC 13-14-8-8 and shall only be granted provided the requirements of this rule are met. No variance may be granted by the department that does not provide for eventual compliance with this rule. Sec. 8. (a) Carmeuse Lime, Inc., whose source identification number (source ID) is 089-00112, in Lake County shall operate and maintain rotary kilns EU-1 through EU-5 in accordance with the manufacturer's specifications and good combustion practices for the control of NOx emissions. (b) United States Steel Corporation Gary Works, whose source ID is 089-00121, in Lake County shall comply with the following emissions limits: (c) W.R. Grace & Co., whose source ID is 089-00310, in Lake County shall: (d) Cleveland-Cliffs Burns Harbor, LLC, Gary Plate, whose source ID is 089-00118, in Lake County shall comply with the following emissions limits: (e) Cleveland-Cliffs Steel, LLC, Indiana Harbor East, whose source ID is 089-00316, in Lake County shall comply with the following emissions limits: (f) Cleveland-Cliffs Steel, LLC, Indiana Harbor West, whose source ID is 089-00318, in Lake County shall comply with the following emissions limits: (g) Indiana Harbor Coke Company, LP, whose source ID is 089-00382, in Lake County shall comply with the following emissions limits: (h) BP Products North America, Inc., Whiting Business Unit, whose source ID is 089-00453, in Lake County shall comply with the following emissions limits: (i) Cleveland-Cliffs Burns Harbor, LLC, whose source ID is 127-00001, in Porter County shall comply with the following emissions limits: (j) United States Steel Corporation Midwest, whose source ID is 127-00009, in Porter County shall comply with the following emissions limits: (k) NLMK Indiana, whose source ID is 127-00036, in Porter County shall comply with the following emissions limits: *These documents are incorporated by reference. Copies may be obtained from the Government Publishing Office, www.gpo.gov, or are available for review at the Indiana Department of Environmental Management, Office of Legal Counsel, Indiana Government Center North, 100 North Senate Avenue, Thirteenth Floor, Indianapolis, IN 46204. Sec. 9. (a) Within one hundred twenty (120) days of becoming subject to this rule, the owner or operator of a facility subject to section 4, including any facility for which the department approves a definition of RACT pursuant to section 8 of this rule and has not approved an alternative schedule for implementing the RACT, shall do one of the following: (b) The owner or operator of a facility which is subject to the requirements of section 4 of this rule, including any facility for which the department approves a definition of RACT pursuant to section 8 of this rule, and has not approved an alternative schedule for implementing the RACT, shall: Sec. 10. The owner or operator of a facility which is subject to the requirements of section 4 or section 8 of this rule shall demonstrate compliance with the applicable emissions limit(s) by one of the following methods: *These documents are incorporated by reference. Copies may be obtained from the Government Publishing Office, www.gpo.gov, or are available for review at the Indiana Department of Environmental Management, Office of Legal Counsel, Indiana Government Center North, 100 North Senate Avenue, Thirteenth Floor, Indianapolis, IN 46204.