Approval and Promulgation of Implementation Plans; Commonwealth of Kentucky

EPA is approving a revision to the Commonwealth of Kentucky's State Implementation Plan (SIP) for the Prevention of Significant Deterioration (PSD) of air quality. The revision was submitted to EPA on March 21, 1997, by the Commonwealth of Kentucky through the Kentucky Natural Resources and Environmental Protection Cabinet. The PSD rule is revised to incorporate the Federal PSD rule revisions. The changes to the rules incorporate revisions to the ``Guidelines on Air Quality Models'' document and revise the allowable increase of particulate matter from increments for suspended particulate (TSP) to increments for particulate matter with an aerodynamic diameter of less than or equal to a nominal 10 micrometers (PM10). The revision also includes the Federal exclusion for pollution control projects undertaken at electric utility units.