AT SIX SEPARATE PETROLEUM UNDERGROUND STORAGE TANK LOCATIONS (GAS STATIONS OR FORMER GAS STATIONS ), MONARCH OIL AND ROBERT BAILEY, OWNER, VIOLATED VARIOUS OF THE UST REGULATIONS AN FACILITY OPERATION, INCLUDING REGULATIONS ON MONITORING AND RELEASE DETECTION (40 CFR 280.41), RECORDKEEPING (40 CFR 280.45), TEMPORARY CLOSURE (40 CFR 280.72), PERMANENT CLOSURE (280.70), AND ABATEMENT MEASURES AFTER DISCOVERY OF A RELEASE (40 CFR 280.61), AND 280.63), AS WELL FINANCIAL RESPONSIBILITY REGULATIONS (40 CFR 280.93). AS PART OF A NORTHWEST INDIANA INITIATIVE, REGION 5 AND IDEM UNDERTOOK JOINT ON-SITE INVESTIGATIONS OF SOME OF MONARCH OIL'S 6 GASOLINE STATIONS LOCATED IN NORTHWEST INDIANA. SUBSEQUENTLY, REGION 5 SUBMITTED INFORMATION REQUESTS REGARDING COMPLIANCE WITH UST REGULATIONS BY ALL 6 STATIONS. ON DECEMBER 16, 1994, REGION 5 FILED AN ADMINISTRATIVE COMPLAINT THAT ALLEGED VIOLATIONS OF UST REGULATIONS GOVERNING RELEASE DETECTION MONITORING OF THE UST SYSTEMS, RECORDKEEPING, AND IMPROPER TEMPORARY AND PERMANENT CLOSURE OF CERTAIN UST'S AT VARIOUS OF THE STATI