Document vbyE7bZZmayQkEXVnkOKJ4Ew

KEYSTONE-CONEMAUGII PROJECTS 175 Cornell Road-- Suite 1 Blairsville, Pennsylvania 15717 GEOR(iIANNA R. STENGER ASSIS-I'A1S'I- MANMiER I)IRI-.C'-I' I)I.AI. 724-357-1713 dStcnacf"li.. hcpo.conl March 31, 2025 Mr. I.cc Zeldin Administrator of the Environmental Protection Agency L.S. Environmental Protection Agency, Headquarters 1200 Pennsylvania Avenue V.W. Washington, DC 20004 [via: airaction(acpa.gov] Re: Presidential Exemption National Emission Standards for Hazardous Air Pollutants: Coal- and Oil-Fired Electric Utility Steam Generating Units Review of the Residual Risk and Technology Review" (89 FR 38508; May 7, 2024) (MATS Rule) Concmaugh Generating Station (ORISPI. 3118) Dear Mr. Zeldin: Keystone-Concmaugh Projects, I,I.C (KEY-CON) is pleased to submit the subject request to the U.S. EPA. KEY-CON is the licensee for two southwestern Pennsylvania (PA) facilities: the Keystone Generating Station located in Armstrong County, PA and the Concmaugh Generating Station located in Indiana County, PA. Emissions standards or limitations subject to the request: Concmaugh Station hereby requests a two-year Presidential Exemption from the pending 40CFR Part 63, MATS limit of 0.01 lb/MMBtu Particulate Matter (PM) as well as the requirement to install, certify and operate a PM continuous emissions monitoring system (CEMS) by July 8, 2027. These requirements arc applicable to Concmaugh Station Unit 1 and Unit 2. The new deadline for the PM limit and PM CEMS in service is requested to be July 8, 2029 or later as the rule under review is potentially revised, and technologies arc finalized. Justification to support this request is presented below. Explanation of vt,h), the technology to implement the standard is not available 1. Certifying a PM CEMS is challenging and costly, and may inaccurately indicate noncompliance. It is already difficult to demonstrate compliance with the current MATS limits with PM CEMs requirements at 0.03 pound per million British Thermal Units (lb/MMBtu) due to the required method of "calibrating" the PM CEMS compliance meters. This method requires either turning off the PM emission control technology, or deliberately injecting particulate matter into the exhaust stack flue gas to attempt to create a steady and -1 - Sierra Club FOIA 2025-EPA-04883 ED_018388_00000061-00001 SC_EVERSPLIT0005629