ALLEGHENY COUNTY HEALTH DEPARTMENT
                              AIR QUALITY PROGRAM

                                 March 7, 2022


SUBJECT: 	GenOn Cheswick Generating Station
      Pittsburgh and Porter Street
      Springdale, PA  15144
      
RE: 		Title V Operating Permit No. 0054-OP17c
      Cheswick Generating Station
      
TO: 		JoAnn Truchan, P.E.
      Section Chief, Engineering
      
FROM: 	Bernadette Lipari
		Air Quality Engineer

AMENDMENT DESCRIPTION:

The initial issuance of this Title V Operating Permit was for the electric generating facility located on Pittsburgh and Porter Streets in Springdale, PA. The plant is composed of one main boiler exhausting to one stack, which fires coal or synfuel as the primary fuel and natural gas as an auxiliary fuel for startup and shutdown. Pollution control equipment for the main boiler includes low NOX burners with separated overfire air, electrostatic precipitation with flue gas conditioning, selective catalytic reduction, and flue gas desulfurization. 

The Title V Operating Permit is being modified to assure compliance with Best Available Retrofit Technology (BART) for the Pennsylvania Regional Haze SIP.  On November 26, 2021, the Department submitted a letter to Cheswick requesting either submission of a five-factor BART analysis or acceptance of a federally enforceable emission limit.  The facility has elected to shut down the Main and Auxiliary Boilers on or before April 1, 2022.  The purpose of this permit amendment is to include that shut-down date as a federally enforceable condition in the Title V Operating Permit. 

Conditions V.A.10 and V.B.7 were added requiring cessation of operation of the Main and Auxiliary Boilers by April 1, 2022.  Conditions pertaining to RACT II, contained in Installation Permit #0054-I005a, issued March 1, 2022 have not been included in this TVOP amendment, but are still applicable to the facility.

AMENDMENT APPLICATION COMPONENTS:
 Application email, dated March 7, 2022
 Title V Operating Permit #0054-OP17b, issued November 21, 2017, amended July 28, 2020
 Correspondence, dated November 26, 2021 (request for BART analysis)
 Correspondence, dated February 28, 2022 (permit termination request)

RECOMMENDATION:

All applicable Federal, State and County regulations have been addressed. The amended Title V Operating Permit should be approved as a minor modification with the terms and conditions in TVOP #0054-OP17c. 
