SOURCE IS SUBJECT TO DEGREASER MACT AT 40 CFR PART 63 SUB- PART T NATIONAL EMISSION STANDARDS FOR HALOGENATED SOLVENT CLEANING MACHINES. HANCOCK MANUFACTURING COMPANY, INC., TORONTO, OHIO, (HANCOCK) MANUFACTURERS CANS FOR AUTOMOBILE OIL FILTERS AND CASINGS FOR CAR AIR CONDITIONING UNITS. HANCOCK HAS SEVEN IN-LINE VAPOR HALOGENATED SOLVENT CLEANING MACHINES (VAPOR DEGREASERS). SIX OF THE VAPOR DEGREASERS ARE EXISTING AS DEFINED BY 40 C.F.R. PART 63, SUBPART T, (DEGREASER MACT) AND ONE IS A NEW VAPOR DEGREASERS AS DEFINED IN THE SAME SUBPART. THE SIX EXISTING VAPOR DEGREASERS USE TRICHLOROETHYLENE (TCE) AS A SOLVENT AND THE NEW VAPOR DEGREASER USES METHYLENE CHLORIDE. ON JANUARY 4, 2000, THE UNITED STATES ENVIRONMENTAL PROTECT- ION AGENCY, REGION 5, (U.S. EPA), ISSUED HANCOCK A REQUEST FOR INFORMATION PURSUANT TO SECTION 114 OF THE CLEAN AIR ACT (INFORMATION REQUEST). IN THE RESPONSE TO THE INFORMATION REQUEST, DATED JANUARY 24, 2000, HANCOCK SUBMITTED COPIES OF INITIAL NOTIFICATIONS, REQUIRED BY THE DEGREASERS MACT, FOR THE SIX EXISTING DEGREASERS, DATED AFTER THE COMPLIANCE DATE, IN VIOLATION OF 63.468 (A). ALSO, IN THE NOTIFICATIONS, HANCOCK CHOSE THE ALTERNATIVE STANDARD AS AN ANTICIPATED COMPLIANCE APPROACH. TO COMPLY WITH THE ALTERNATIVE STANDARD 40 C.F.R. 63.464, HANCOCK WOULD HAVE TO MAINTAIN A MONTHLY LOG OF SOLVENT