Sisecam Wyoming LLC June 10, 2021, and August 6, 2021, Air Quality Division Exceptional Event Demonstration Released for Public Comment

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Public Notices: August 23, 2025

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PUBLIC NOTICE

STATE OF WYOMING

Department of Environmental Quality - Air Quality Division

Şişecam Wyoming LLC, June 10, 2021, and August 6, 2021, Exceptional Events Demonstration

The Wyoming Air Quality Division (AQD) will submit an Exceptional Events Demonstration for the Şişecam Wyoming LLC - Big Island Mine & Refinery, June 10, 2021, and August 6, 2021, PM₁₀ exceedances attributed to high wind events to EPA Region 8 in accordance with 40 CFR 50.14. The AQD is soliciting comments from the interested public on this Exceptional Events Demonstration. The plan is available for public comment, and the public will be allowed a period of thirty (30) days to submit written comments. Public comments must be received no later than September 24, 2025. All comments received by the close of business on September 24, 2025, will be submitted to EPA's Region 8 along with the Exceptional Events Demonstration and will be retained on file in the Cheyenne office.

Notice is hereby given the State of Wyoming, Department of Environmental Quality, Air Quality Division, proposes to submit the Şişecam Wyoming LLC - Big Island Mine & Refinery, June 10, 2021, and August 6, 2021, for PM₁₀ exceedances to the EPA.

Comments can be submitted to the AQD's Air Pollution Monitoring Program Manager, Mr. Mark R. Gagen, Air Pollution Monitoring Program Manager, Air Quality Division, Department of Environmental Quality, 200 West 17^th Street, 3^rd Floor, Cheyenne, Wyoming 82002. Comments may also be submitted electronically through the following website: (https://aq.wyomingdeq.commentinput.com/comment/search). Comments submitted by email will not be accepted. Interested parties may examine the documentation packet and relevant supporting materials on AQD's website https://deq.wyoming.gov/aqd/monitoring/. In accordance with the Americans with Disabilities Act, special assistance or alternate formats will be made available upon request for individuals with disabilities. Para espanol visite deq.wyoming.gov.

Please note that the Wyoming Department of Environmental Quality Cheyenne Office has moved.
The new address is:

200 West 17th Street
Cheyenne, WY 82002

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