EPA is approving Minnesota's request to amend its State Implementation Plan (SIP) for sulfur dioxide (SO<INF>2</INF>). The Minnesota Pollution Control Agency (MPCA) submitted the SIP revision request to EPA on November 23, 2009, and supplemented it on March 3, 2010. EPA's approval revises SIP requirements applicable to Saint Mary's Hospital, located in Rochester, Minnesota, by adding a 2500 kilowatt (KW) reciprocating internal combustion engine (RICE) electric generator and reducing the allowable diesel fuel sulfur content for two existing RICE electric generators. The revision also includes administrative changes in the identification of emissions units. These revisions are included in a joint Title I/Title V document for Saint Mary's Hospital, which replaces the document currently approved into the SIP for the facility. These revisions will result in reducing the SO<INF>2</INF> impact in the Rochester area, and strengthen the existing SO<INF>2</INF> SIP.