Approval and Promulgation of Air Quality Implementation Plans; Pennsylvania; Enhanced Inspection and Maintenance Program Network Effectiveness Demonstration

EPA is approving a State Implementation Plan (SIP) revision supplement submitted by the Commonwealth of Pennsylvania on August 21, 1998. This supplement consists of a demonstration of the effectiveness of the Pennsylvania SIP's enhanced motor vehicle emissions inspection and maintenance (I/M) program. It includes a demonstration of the effectiveness of Pennsylvania's I/M testing network to satisfy the requirements of the National Highway Systems Designation Act of 1995 (NHSDA). The effect of this action is to approve the Commonwealth's demonstration of the effectiveness of its I/M program testing network, and to remove all de minimus conditions related to EPA's approval of Pennsylvania's program under the NHSDA. There is one remaining major condition of EPA's January 28, 1997 approval of Pennsylvania's I/M program related to the methodology for conducting on-going evaluation of the enhanced I/M program. Pennsylvania addressed that condition in a separate SIP submittal made to EPA on November 26, 1998. EPA will take separate action upon that submittal.