                 UNITED STATES ENVIRONMENTAL PROTECTION AGENCY
                                  REGION III
                               1650 Arch Street
                       Philadelphia, Pennsylvania, 19103

DATE:

May 28, 2021
SUBJECT:
Confidential Business Information (CBI) Explanation Memo for Pennsylvania State Implementation Plan Revisions Related to Reasonably Available Control Technology (RACT) Determinations for Case-by-Case Sources under the 1997 and 2008 8-Hour Ozone National Ambient Air Quality Standards (NAAQS)

TO:
File for Docket ID Number EPA-R03-OAR-2021-0217

                                       
CBI has either been removed from the public files or a redacted version of documents with CBI have been add to the Docket file - ID Number  -  EPA-R03-OAR-2021-0217.


The following facilities have redacted CBI documents that have been added to the Docket file for public consumption:  


 ATI Flat Rolled products Holdings, LLC
 Carpenter Latrobe Specialty Metals, LLC
 Consol Pennsylvania Coal Company, LLC
 Dart Container Corporation of Pennsylvania  -  Leola 
 Ipsco Koppel Tubular Corporation  -  Koppel
 Ipsco Koppel Tubular Corporation  -  Ambridge
 Jessop Steel/ Washington Plant
 Kawneer Commercial Windows/ Cranberry Township
 Markwest Liberty Bluestone Plant
 York Group, Inc., York Casket Manufacturing
