NPC HAS BEEN OPERATING ITS REID-GARDNER GENERATING STATION IN VIOLATION OF THE NEW SOURCE PERFORMANCE STANDARDS ( NSPS ) OF THE CLEAN AIR ACT ( CAA ). THE REID-GARDNER FACILITY IS A LARGE COAL-FIRED ELECTRIC POWER GENERATING STATION LOCATED NORTH OF LAS VEGAS, NV, CONSISTING OF 4 UNITS AND PRODUCING 580 MW ELECTRICAL OUTPUT. THE NSPS VIOLATIONS ARE NUMEROUS AND OF DIFFERENT VARIETIES SPREAD OVER AN ALMOST TWO-YEAR PERIOD. NPC OPERATED REID-GARDNER UNIT 3 ( RG-3 ) FOR ELEVEN DAYS IN 1985 WITHOUT POLLUTION CONTROL EQUIPMENT, RESULTING IN EXCESS PARTICULATE MATTER ( PM ) AND SULFUR DIOXIDE ( S02 ) EMISSIONS AND OPACITY. THIS ALSO REPRESENTS A VIOLATION OF AN NSPS REGULATION REQUIRING GOOD AIR POLLUTION CONTROL PRACTICES. ADDITIONALLY, NPC VIOLATED A NUMBER OF REQUIRE- MENTS FOR THE RG-3 CONTINUOUS EMISSIONS MONITORING SYSTEMS ( CEMS ). NPC'S REID-GARDNER UNIT 4 ( RG-4 ) FAILED SOURCE TESTS IN 1984 AND 1986, INDICATING PM EMISSIONS VIOLATIONS. NPC HAS ALSO VIOLATED THE CEMS REGULATION FOR RG-4 IN AT LEAST SEVERAL HUNDRED INCIDENTS.