Air Plan Approval; Indiana; SO2

The Environmental Protection Agency (EPA) is proposing to approve a request submitted by the Indiana Department of Environmental Management on June 1, 2015, to revise its state implementation plan (SIP) for sulfur dioxide (SO2). The revision updates information regarding Walsh and Kelly, Incorporated, a hot mix asphalt plant located in Griffith, Lake County, Indiana. Walsh and Kelly, Incorporated, is replacing its aggregate drum dryer. The revision does not change any of the SO2 control requirements and will not result in an increase in SO2 emissions.