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Federal Register / Vol. 86, No. 27 / Thursday, February 11, 2021 / Proposed Rules identified in the FOR FURTHER
INFORMATION CONTACT section.

ENVIRONMENTAL PROTECTION
AGENCY
40 CFR Part 52
EPAR05OAR20200369; FRL10016
82Region 5

Air Plan Approval; Indiana; Two Revised Sulfur Dioxide Rules for Lake County Environmental Protection Agency EPA.
ACTION: Proposed rule.
AGENCY:

The Environmental Protection Agency EPA is proposing to approve revisions to the Indiana sulfur dioxide SO2 State Implementation Plan SIP.
The State of Indiana has requested these SIP revisions in order to satisfy the requirements of a Federal consent decree. If approved, these revisions would limit annual bypass venting limits in the sulfur-containing waste gas emissions from a coking and power generating facility in Lake County, Indiana which is owned and operated by Indiana Harbor Coke Company IHCC and Cokenergy LLC Cokenergy.
The revisions would also require Cokenergy to operate and maintain a permanent SO2 flow rate monitor and improve the percent control capture efficiency of the facility. The rulemaking also includes technical corrections and clarifications that do not have a substantive effect of the application of the rule.
DATES: Comments must be received on or before March 15, 2021.
ADDRESSES: Submit your comments, identified by Docket ID No. EPAR05
OAR20200369 at http
www.regulations.gov, or via email to aburano.douglas@epa.gov. For comments submitted at Regulations.gov, follow the online instructions for submitting comments. Once submitted, comments cannot be edited or removed from Regulations.gov. For either manner of submission, EPA may publish any comment received to its public docket.
Do not submit electronically any information you consider to be Confidential Business Information CBI
or other information whose disclosure is restricted by statute. Multimedia submissions audio, video, etc. must be accompanied by a written comment.
The written comment is considered the official comment and should include discussion of all points you wish to make. EPA will generally not consider comments or comment contents located outside of the primary submission i.e., on the web, cloud, or other file sharing system. For additional submission methods, please contact the person
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For the full EPA public comment policy, information about CBI or multimedia submissions, and general guidance on making effective comments, please visit http www2.epa.gov/dockets/
commenting-epa-dockets.
FOR FURTHER INFORMATION CONTACT:
Andrew Lee, Physical Scientist, Attainment Planning and Maintenance Section, Air Programs Branch AR18J, Environmental Protection Agency, Region 5, 77 West Jackson Boulevard, Chicago, Illinois 60604, 312 3537645, lee.andrew.c@epa.gov. The EPA Region 5 office is open from 8:30 a.m. to 4:30
p.m., Monday through Friday, excluding Federal holidays and facility closures due to COVID19.
SUPPLEMENTARY INFORMATION:
Throughout this document whenever we, us, or our is used, we mean EPA.
I. Background On July 10, 2020, the Indiana Department of Environmental Management IDEM submitted a request for revisions of the Indiana SO2
SIP for IHCC and Cokenergy, which operate a coking and power generating facility in East Chicago, Indiana. IHCC
operates four coke oven batteries, and Cokenergy uses the coke oven gases to generate steam and electricity. The electricity and coke are used by the neighboring steel mill operated by ArcelorMittal. Under the terms of a consent decree entered on October 25, 2018, the two companies requested that Indiana revise 326 Indiana Administrative Code IAC 74.17
Cokenergy and 326 IAC 74.18
IHCC to address emissions of sulfurcontaining waste gases. See United States and the State of Indiana v.
Indiana Harbor Coke Company and Suncoke Energy, Inc. and Coke Energy, LLC, Civil Action No. 18cv35
N.D.Ind. 2018. Indianas adoption and submittal of these revised rules to EPA
for approval into the SIP satisfy part of the consent decrees requirements.
II. Changes for the Facility IHCCs coke batteries produce coke as their main product. Hot coke oven gas is generated from heating coal in coke ovens to approximately 2,000 F. The volatile products from the coal, produced by the high heat, are then combusted with oxygen to provide heat from above and gas flues in the bottom of the chamber collect the combustion gases and provide heat from below. This recycling of gases is the fuel used for the ovens during normal operations. Once
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almost all the coke oven gases are combusted, the gas passes from the different ovens in a battery into a common tunnel and passes into an afterburner which oxidizes any gases that are not fully combusted. The gas stream is then directed to one of the sixteen heat recovery steam generators HRSGs operated by Cokenergy, where this heat is used to make steam to generate electricity. The coke oven gas cools as it passes through the HRSG, allowing the gas to be routed through air pollution control devices, including a flue gas desulfurization FGD unit and a baghouse, before venting through the main stack. When a HRSG is offline because of maintenance, malfunction or process concerns, or for any other reason, some of the gases must be vented through the common tunnel afterburner to a bypass vent stack because the extreme temperature of the gases would damage the pollution control equipment downstream. IHCC
has sixteen bypass vent stacks, one associated with each HRSG.
The revised SIP decreases the amount of coke oven gas which can be allowed to vent to the atmosphere through the bypass vent stacks. Previously, the facility was permitted to vent fourteen percent 14% of the coke oven waste gas through the common tunnel on an annual basis. Now, during normal operation of the HRSG, the revised rule limits venting gases out through the bypass vent stacks to a maximum of thirteen percent 13% of the coke oven waste gases leaving the common tunnel, as determined on an annual basis.
However, if Cokenergy undertakes HRSG retubing, as defined in 326 IAC
74.17e, then venting gases out through the bypass vent stacks is allowed up to a maximum of fourteen percent 14% of the coke oven waste gases leaving the common tunnel, as determined on an annual basis for the calendar year that Cokenergy undertakes the HRSG retubing. The rule requires the facility to verify that the fourteen percent venting limit in 326 IAC 74.1
7d1 is warranted by the retubing activities. If less than 3.25% of the annual venting is due to the retubing activities, then the facility may only vent 13% of their annual emissions via the bypass vent stacks. Overall, this action would increase the control capture efficiency of the facility by increasing the percentage of the exhaust gas stream routed to control devices.
Rule 326 IAC 74.17 retains the combined SO2 limit for Cokenergys heat recovery coke carbonization waste gas stack and the 16-bypass vent stacks operated by IHCC for a 24-hour average SO2 emission limit of 1,656 pounds per
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