Approval and Promulgation of Air Quality Implementation Plans; Commonwealth of Pennsylvania; Enhanced Motor Vehicle Inspection and Maintenance Program

This action approves an August 21, 1998 State Implementation Plan (SIP) revision submitted by the Commonwealth of Pennsylvania to supplement its enhanced motor vehicle emissions inspection and maintenance (I/M) program SIP. The August 21, 1998 SIP revision submittal addresses the seven remaining minor, or de minimus, deficiencies cited in EPA's January 28, 1997 conditional interim approval of Pennsylvania's enhanced I/M program. In addition, Pennsylvania submitted a demonstration of the effectiveness of its decentralized network required under the National Highway Systems Designation Act of 1995 (NHSDA). The intended effect of this action is to remove all remaining de minimus conditions imposed by EPA in its January 28, 1997 conditional interim approval of Pennsylvania's March 1996 enhanced I/M SIP revision, and to approve the Commonwealth's decentralized network effectiveness demonstration. EPA is hereby removing the interim approval status of the Commonwealth's I/M SIP, granted under the NHSDA. However, as Pennsylvania must still provide specific information related to one condition of the January 28, 1997 approval of its enhanced I/M program, the Commonwealth's enhanced I/M SIP remains conditionally approved under the Clean Air Act.