BOISE CASCADE CORP ( BOISE ) HAS VIOLATED THE REGULATIONS FOR PREVENTION OF SIGNIFICANT DETERIORATION OF AIR QUALITY (PSD) 40 CFR 52.21; APPENDIX S OF 40 CFR 51,165, AN EMISSION OFFSET INTERPRETATIVE RULING; AND THE MINNESOTA STATE IMPLE- MENTATION PLAN ( SIP ). THIS REFERRAL IS BASED ON AN INSPECTION CONDUCTED BY USEPA ON OCTOBER 6, 1988, WHICH REVEALED THAT BOISE HAD COMMENCED CONSTRUCTION TO MODIFY AND EXPAND ITS EXISTING PULP AND PA- PER MILL IN INTERNATIONAL FALLS, MINNESOTA, IN VIOLATION OF THE FOLLOWING REGULATIONS REQUIRING PRECONSTRUCTION PERMITS: MINNESOTA RULES 6 MCAR 4.4003, 4.4004, 4.4005, 4.4303, ALL OF WHICH ARE PART OF THE FEDERALLY APPROVED MINNESOTA SIP, 52.21I OF THE PSD REGULATIONS, AND APPENDIX S OF 40 CFR PART 51. BASED UPON EMISSION ESTIMATES PROVIDED BY BOISE THAT ARE THE LEAST FAVORABLE TO THE GOVERNMENT'S CASE, THE MODIFI CATION OF THE FACILITY WILL INCREASE EMISSIONS OF NITROGEN OXIDES BY MORE THAN 40 TONS PER YEAR, MAKING IT A SIGNIFI- CANT MODIFICATION, SUBJECT TO PRECONSTRUCTION REVIEW. IN ADDITION, OUR ASSESSMENT OF THE LATEST EMISSION DATA SUBMIT- TED BY BOISE IS THAT THE MODIFICATION IS ALSO MAJOR FOR PAR- TICULATE MATTER, PM10, SULPHUR DIOXIDE, CARBON MONOXIDE, AND VOLATILE ORGANIC COMPOUNDS. REGION V SEEKS TO ENJOIN BOISE FROM FURTHER CONSTRUCTION AT ITS INT'L FALLS FACILITY, UNTIL VALID CONSTRUCTION PERMITS ARE ISSUED BY THE APPROPRIATE AUTHORITY, AND SEEKS A CIVIL PENALTY O