Steel Dynamics, Inc. (SDI) is a steel manufacturing facility which built a new structural steel mill on 440 acres of land on the eastern border of Whitley County, Indiana. The State of Indiana�s Department of Environmental Management (IDEM) issued a construction permit for this new facility on July 7, 1999, which authorized SDI to begin construction thirty (30) days after its issuance. Within that time, the Citizens Organized Watch (COW) appealed the issuance of the permit. SDI and IDEM revised the permit, and IDEM issued the revised construction permit on January 10, 2001. This January 10, 2001 permit authorized SDI to begin construction thirty (30) days after its issuance. On February 10, 2001, COW sent a petition to the Environmental Appeals Board (EAB), asking the board to review the content of SDI�s permit once again, thereby staying the effect of the January 10, 2001 permit. On April 23, 2001, the EAB denied review of the appeal, indicating that SDI could immediately commence construction.
In a letter dated September 5, 2000, COW advised the United States Environmental Protection Agency (U.S. EPA) that SDI had begun construction activities at its site in Whitley County prior to having a final construction PSD permit. On September 18, 2000, Ms. Linda Hamsing, Environmental Engineer, U.S. EPA, conducted a site visit followed by a second inspection on February 12, 2001, by Ms. Hamsing and Ms. Lynne Suesse, Environmental Scientist, U.S. EPA. Based on these in