EPA is finalizing disapproval of a revision to the San Joaquin Valley Unified Air Pollution Control District (SJVUAPCD) portion of the California State Implementation Plan (SIP). This action was proposed in the Federal Register on September 29, 2003 and concerns visible emissions (VE) from many different sources of air pollution. Under authority of the Clean Air Act as amended in 1990 (CAA or the Act), this action directs California to correct rule deficiencies in SJVUAPCD Rule 4101.