This regulation establishes time-limited tolerances for combined residues of the safener isoxadifen-ethyl in or on rice, grain; rice, straw; rice, hulls; and rice, bran. Aventis CropScience requested this tolerance under the Federal Food, Drug, and Cosmetic Act (FFDCA), as amended by the Food Quality Protection Act (FQPA) of 1996. The tolerance will expire on June 21, 2004.