This regulation establishes a tolerance for combined residues of pendimethalin, [N-(1-ethylpropyl)-3,4-dimethyl-2,6- dinitrobenzenamine], and its metabolite 4-[(1-ethylpropyl)amino]-2- methyl-3,5-dinitrobenyzl alcohol in or on pistachio. Interregional Research Project Number 4 (IR-4) requested this tolerance under the Federal Food, Drug, and Cosmetic Act (FFDCA), as amended by the Food Quality Protection Act of 1996 (FQPA).