THIS CLAYTON, ALABAMA FACILITY OWNED BY LOUISIANA-PACIFIC CORPORATION(LPC) WAS REFERRED TO HQ IN JULY, 1992, FOLLOWING HQ'S DECISION TO INCLUDE LPC'S MEDIUM DENSITY FIBERBOARD PLANTS IN THE NATIONAL CASE. LPC'S CLAYTON, ALA. MEDIUM DENSITY FIBERBOARD (MDF) FACILITY IS PART OF HQ'S NINE- FACILITY CIVIL ENFORCEMENT ACTION AGAINST LPC. HQ REFERRED THIS CIVIL ENFORCEMENT ACTION TO DOJ ON AUGUST 27, 1992, AND REQUESTED DOJ TO FILE THE ACTION AS A SINGLE NATIONAL CASE GIVEN LPC'S CORPORATE PATTERN OF NONCOMPLIANCE WITH PSD REGULATIONS. THE CLAYTON FACILITY WAS ORIGINALLY BUILT IN 1974 AS A PARTICLEBOARD PLANT, AND HAS BEEN MODIFIED TWICE SINCE THEN. THE FIRST MODIFICATION TOOK PLACE IN 1979 WHEN THE PLANT WAS CONVERTED TO PRODUCE MDF. STACK TESTS CONDUC- TED IN MAY 1992 DEMONSTRATE THAT THE PRODUCTION LINE AT THE FACILITY HAS THE POTENTIAL TO EMIT OVER 250 TONS PER YEAR (TYP) OF PARTICULATE MATTER (PM) AND VOCS. THE PRODUCTION LINE HAD THE SAME POTENTIAL TO EMIT WHEN CONSTRUCTED AND WAS BUILT WITHOUT THE PREREQUISITE PREVENTION OF SIGNIFICANT DETERIORATION (PSD) PERMIT. SIMILARLY, THE SECOND PRODUC- TION LINE HAS THE POTENTIAL TO EMIT GREATER THAN 250 TPY OF PM AND VOCS AND WAS CONSTRUCTED IN 1987 WITHOUT A PSD PERMIT NEITHER LINE HAS A PSD PERMIT AT THIS TIME, AND THUS CON- TINUES TO OPERATE IN VIOLATION OF THE ALABAMA STATE IMPLEM- ENTATION PLAN (SIP) AND SECTION 165(A) OF THE CAA, AND 40 C.F.R. SECTION 52.21. THE CALCULATE