THE FACILITY THAT IS THE SUBJECT OF THIS MATTER IS A MUNICIPAL WASTE INCINERATOR PLANT LOCATED IN MANCHESTER TOWNSHIP, YORK COUNTY, PENNSYLVANIA. THE FACILITY IS OWNED BY WESTINGHOUSE ELECTRIC CORPORATION (WESTINGHOUSE), AND OPERATED BY YORK RESOURCE ENERGY SYSTEMS, INCOPORATED (YORK) A SUBSIDIARY OF WESTINGHOUSE. THE PLANT IS EQUIPPED WITH THREE ROTARY WATER WLAL COMBUSTORS THAT EMIT, AMONG OTHER THINGS, CARBON MONOXIDE (CO), SULFUR DIOXIDE (SO2), HYDROGEN CHLORIDE (HCI), NICKEL, PARTICULATE MATTER, ARSENIC, MERCURY AND CHROMIUM. THE FACILITY IS LOCATED IN AN AREA THAT HAS BEEN DESIGNATED AS AN AREA IN WHICH THE PRIMARY AND SECON- DARY NATIONAL AMBIENT AIR QUALITY STANDARDS (NAAQS) HAVE BEEN ATTAINED OR ARE UNCLASSIFIABLE FOR ALL CRITERIA POLLUTANTS, EXCEPT OZONE, THAT ARE EMITTED BY THE FACILITY. SEE 40 C.F.R. SECTION 81,339. A PREVENTION OF SIGNIFICANT DETERIORATION (PSD) PERMIT WAS ISSUED TO YORK COUNTY SOLID WASTE AND REFUSE AUTHORITY, THE ORIGINAL OWNER OF THE FACILITY, AND TO WESTINGHOUSE (WHO WAS THEN THE FACILITY'S OPERATOR) ON *05/13/87, FOR CONSTRUCTION OF THE FACILITY. (ATTACHMENT 1) THE PERMIT STATES THAT THE FACILITY WOULD USE THREE WESTINGHOUSE/O'CONNOR ROTARY WATER WALL COMBUSTORS, EACH OF WHICH HAS THE POTENTIAL TO CHARGE 448 TONS OF REFUSE PER DAY. AS A RESULT, THE FACILITY WOULD HAVE THE POTENTIAL TO CHARGE 1,344 TONS OF REFUSE PER DAY. THE PERMIT ALSO ALLOWS MAXIMUM TOTAL