RESPONDEND OWNED/OPERATED AT LEAST 5 USTS THAT STORE REGULATED SUBSTANCES BUT FOR WHICH RESPONDENT MAINTAINED NO RELEASE DETECTION; A SIXTH UST STORES FUEL OIL BURNED ON PREMISES AND IS THEREFORE EXEMPT - SEE AO C.F.R. SECTION 280.12, 42 U.S.C. SECTION 6991(1)(B).