Approval and Promulgation of State Implementation Plans: Oregon

The EPA is approving State Implementation Plan (SIP) revisions submitted by the State of Oregon, Department of Environmental Quality (ODEQ). These revisions pertain to the Clean Air Act (CAA) section 110(a) maintenance plans prepared by ODEQ, to maintain the 8-hour national ambient air quality standard (NAAQS) for ozone, in the Portland portion of the Portland/Vancouver Air Quality Maintenance Area (Pdx/Van AQMA), and the Salem-Keizer Area Transportation Study Air Quality Area (SKATS). The 110(a)(1) maintenance plans for these areas meet CAA requirements and demonstrate that each of the above mentioned areas will be able to remain in attainment for the 1997 and 2008 8-hour ozone NAAQS through 2015. As SKATS appears to be significantly impacted by emissions from the Portland area, an approved plan for the Pdx/Van AQMA is one of the control strategies for SKATS. Therefore, EPA is approving the section 110(a) plans for the Portland portion of the Pdx/ Van AQMA and SKATS at the same time. Additionally, the EPA is approving SIP revisions submitted by ODEQ that phase out the State's Vehicle Inspection Program (VIP) enhanced BAR-31 test, and eliminate the Gas Cap Pressure Test and the Evaporative Purge Tests.