This regulation establishes tolerances for residues of chlorsulfuron; (2-chloro-N-[(4-methoxy-6-methyl-1,3,5-triazin-2- yl)aminocarbonyl]benzenesulfonamide) in or on grass, forage and grass, hay. E.I. du Pont de Nemours and Company, Inc. requested these tolerances under the Federal Food, Drug, and Cosmetic Act, as amended by the Food Quality Protection Act of 1996.