EPA is finalizing disapproval of a revision to the South Coast Air Quality Management District (SCAQMD) portion of the California State Implementation Plan (SIP). This action was proposed in the Federal Register on September 8, 2009 and concerns volatile organic compound (VOC) emissions from polymeric foam manufacturing operations. Under authority of the Clean Air Act as amended in 1990 (CAA or the Act), this action identifies several deficiencies in SCAQMD Rule 1175.