EPA is approving a State Implementation Plan (SIP) revision submitted by the State of South Carolina on October 30, 2000, and revised on July 30, 2001. This revision was submitted to satisfy EPA's regulation entitled, "Finding of Significant Contribution and Rulemaking for Certain States in the Ozone Transport Assessment Group Region for Purposes of Reducing Regional Transport of Ozone," otherwise known as the "NO<INF>X</INF> SIP Call." This revision establishes and requires a nitrogen oxides (NO<INF>X</INF>) allowance trading program for large electric generating units (EGUs) and industrial units (non-electric generating units, or non-EGUs), and reductions for cement kilns, beginning in 2004. The intended effect of this SIP revision is to reduce emissions of NO<INF>X</INF> in order to help attain the national ambient air quality standard for ozone. On December 26, 2000, EPA determined that South Carolina had failed to submit a SIP in response to the NO<INF>X</INF> SIP Call, thus starting an 18 month clock for the mandatory imposition of sanctions and the obligation for EPA to promulgate a Federal Implementation Plan (FIP) withing 24 months. On May 28, 2002, South Carolina submitted a NO<INF>X</INF> SIP and EPA found that SIP submission complete on June 4, 2002, stopping the sanctions clock. Through this Federal Register rule, both the sanctions clock and EPA's FIP obligation are terminated.