THE REGULATIONS FOR THE PREVENTION OF SIGNIFICANT DET- ERIORATION OF AIR QUALITY (PSD) 40 CFR 52.21 WERE PROMULGATD BY THE ADMINISTRATOR ON JUNE 9, 1978, AT FED REG 26403. THESE REGULATIONS ARE APPLICABLE TO THE CONSTRUCTION OF MAJOR STATIONARY SOURCES OF AIR POLLUTION AS DEFINED AT 40 CFR 52.21(B)(2)(I). ON DECEMBER 20, 1979, U.S. EPA/REG-V ISSUED AN APPROVAL TO CONSTRUCT PURSUANT TO THE PSD REGULATIONS, TO LOUISIANA PACIFIC CORPORATION. THE APPROVAL WAS FOR THE CONSTRUCTION OF A WAFERBOARD PROCESSING PLANT IN HAYWARD, WISCONSIN. THIS PLANT IS KNOWN AS HAYWARD I. HAYWARD I IS A MAJOR SOURCE OF PARTICULATE MATTER. HAYWARD II, AN ADDITIONAL WAFERBOARD PROCESSING PLANT, WAS CONSTRUCTED AND IS OPERATED BY LOUISIANA PACIFIC COR- PORATION IN HAYWARD, WISCONSIN. HAYWARD II IS A MAJOR MOD- IFICATION TO A MAJOR SOURCE WHICH SIGNIFICANTLY INCREASES THE EMISSION OF PARTICULATE MATTER AND VOLATILE ORGANIC COM- POUNDS FROM THE LOUISIANA PACIFIC CORPORATION'S HAYWARD FACILITY. HAYWARD II IS SUBJECT TO THE REQUIREMENTS OF PSD INCLUDING THE REQUIREMENT TO OBTAIN AN APPROVAL TO CONSTRUCT PRIOR TO THE COMMENCEMENT OF CONSTRUCTION. LOUISIANA PACIFIC CORPORATION HAS NOT OBTAINED A PSD APPROVAL TO CONSTRUCT FROM U.S. EPA/REG-V FOR HAYWARD II. THE APPROVAL TO CONSTRUCT FOR HAYWARD I LIMITS THE EMISSION OF PARTICULATE MATTER FROM THE WAFERBOARD