DURING THE INSPECTION OF THE FACILITY, THE EPA INSPECTOR OBSERVED THAT THERE WASW LARGE RESIDUAL AMOUNT OF USED OIL IN A USED OIL TANK. IN RESPONSE TO A FOLLOW-UP INFORMATION REQUEST LETTERS, THE RESPONDENT OWNERS CONFIRMED THAT THEY AND THE OPERATOR HAD NOT PERFORMED TANK RELEASE DETECTION FOR THE TANK FOR ABOUT TWO AND ONE HALF YEARS. AFTER CONFIRMING THIS, THE OWNERS REMOVED THE REMAINING USED OIL.