SYNOPSIS SPRINGFIELD CRUSHER, A DIVISION OF MASONRY PRODUCTS- VIRGIN ISLANDS CORP., IS A ROCK CRUSHING AND ROCK QUARRYING OPERATION LOCATED ON THE ISLAND OF ST. CROIX, UNITED STATES VIRGIN ISLANDS ( USVI ). THIS FACILITY IS A MAJOR STATION- ARY SOURCE OF AIR POLLUTANT EMISSIONS SUBJECT TO THE RE- QUIREMENTS OF THE CLEAN AIR ACT, AS AMENDED ( THE ACT ), AND THE AIR POLLUTION CONTROL REGULATIONS PROMULGATED THERE- UNDER. PURSUANT TO SECTION 113(A) OF THE ACT, THE REGION II OFFICE OF THE UNITED STATES ENVIRONMENTAL PROTECTION AGENCY ( EPA OR THE AGENCY ) ISSUED NOTICES OF VIOLATION TO SPRINGFIELD CRUSHER ON JUNE 11, 1982 AND ON JULY 18, 1983 IN CONNECTION WITH THE COMPANY'S INSTALLATION AND OPERATION OF CERTAIN ROCK CRUSHING AND QUARRYING EMISSION SOURCES. SPECIFICALLY, THE FORMER NOTICE OF VIOLATION ( NOV ) ALLEGED THAT SPRINGFIELD CRUSHER HAD VIOLATED (1) THE LOCAL CON- STRUCTION AND OPERATION PERMIT REQUIREMENTS INCORPORATED WITH THE USVI STATE IMPLEMENTATION PLAN ( SIP ) PROMULGATED PURSUANT TO SECTION 110 OF THE ACT; (2) THE LOCAL VISIBLE EMISSION AND FUGITIVE EMISSION STANDARDS INCORPORATED WITH- IN THE USVI SIP PURSUANT TO SECTION 110 OF THE ACT; AND (3) THE FEDERAL PREVENTION OF SIGNIFICANT DETERIORATION OF AIR QUALITY ( PSD ) REGULATIONS PROMULGATED PURSUANT TO SEC- TIONS 160-169 OF THE ACT AND SPECIFICA