Approval and Promulgation of Implementation Plans; Indiana

The EPA is approving revisions to particulate matter (PM) emissions regulations for Union Tank Car's railcar manufacturing facility located in Lake County, Indiana. The Indiana Department of Environmental Management (IDEM) submitted the revised regulations to EPA on April 30, 2002 and September 6, 2002 as an amendment to Indiana's State Implementation Plan (SIP). The revisions consist of relaxing the PM limits for one emissions unit; however, actual emissions will not increase, and the PM National Ambient Air Quality Standards (NAAQS) should be protected. EPA is approving revisions for Union Tank Car because complying with the current limits is infeasible, and because the revisions should not harm air quality.