Approval and Promulgation of Implementation Plans; Indiana

On June 7, 2001, the EPA proposed to approve a November 15, 2000, State Implementation Plan (SIP) revision request which tightens Volatile Organic Compound (VOC) regulations for cold cleaning degreasing operations in Clark, Floyd, Lake and Porter Counties in Indiana, which are nonattainment for ozone. VOC combines with oxides of nitrogen in the atmosphere to form ground-level ozone, commonly known as smog. Exposure to ozone is associated with a wide variety of human health effects, agricultural crop loss, and damage to forests and ecosystems. The State of Indiana has included the tightened cold cleaning degreasing regulations in its 2002, 2005 and 2007 Rate-Of- Progress (ROP) Plans and its 2007 attainment demonstration for Lake and Porter Counties. Indiana expects that the control measures specified in this SIP revision will reduce VOC emissions in Clark, Floyd, Lake and Porter Counties. EPA did not receive any public comments in response to its proposed approval. We are approving Indiana's cold cleaning degreasing rule.