In this action, the EPA is approving the alternative emission reduction (bubble) plan for the Shell Oil Company's Deer Park manufacturing complex as a revision to the Texas State Implementation Plan (SIP). The bubble plan uses the emission reduction credit (ERC) from volatile organic compound (VOC) reductions at an analyzer vent in lieu of controlling VOC emissions from three vacuum vents. The bubble plan was reviewed for consistency with the EPA's Emissions Trading Policy Statement (ETPS) published in the Federal Register on December 4, 1986.