Public Notice: Ciner - November 1, 2017 Exceptional Events Package

Wyoming Department of Environmental Quality  | view as a webpage

Wyoming Department of Environmental Quality

Department of Environmental Quality/Division of Air Quality
Ciner Wyoming LLC Exceptional
Event (PM10) Documentation Packet

Ciner Wyoming LLC (Ciner), has requested that exceedances of the 24-hour Particulate Matter 10 (PM10) standard collected at the Downwind BAM samplers on November 1, 2017 be flagged as due to an exceptional event under 40 CFR 50.14, “Treatment of air quality monitoring data influenced by exceptional events.”  This facility has submitted a documentation packet to the Air Quality Division (AQD) in support of its request to flag the exceedances cited above.  The AQD is soliciting comments from the interested public on this documentation packet.  The documentation packet submitted to the AQD is available for public comment and the public will be allowed a period of thirty (30) days to submit written comments. 

Notice is hereby given that the State of Wyoming, Department of Environmental Quality, Division of Air Quality, proposes to flag this data as influenced by an exceptional event.

Comments may be submitted by mail to the Division's Ambient and Emission Monitoring Supervisor contact, Cara Keslar, Division of Air Quality, Department of Environmental Quality, 200 West 17th Street, Third Floor, Cheyenne, Wyoming 82002 or by fax to (307) 635-1784.  Comments may also be submitted electronically through the following website: (  Comments submitted by email will not be accepted.  Interested parties may examine the documentation packet and all relevant supporting materials on AQD’s website ( as well as the Division's Cheyenne office.  Arrangements can be made with the Division to copy relevant materials if necessary (a fee will be assessed for reproductions).  In accordance with the Americans with Disabilities Act, special assistance or alternate formats will be made available upon request for individuals with disabilities.

Public comments must be received no later than December 20, 2018.  All comments received by the close of business on December 20, 2018 will be submitted to EPA’s Region 8 along with the documentation packet to be considered in arriving at a final determination of treatment of data influenced by exceptional events and will be retained on file in the Cheyenne office.  

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