This regulation extends time-limited tolerances for the combined residues of the herbicide metolachlor and its metabolites in or on spinach at 0.3 part per million (ppm) for an additional 19\1/2\- month period and grass forage at 10 ppm and grass hay at 0.2 ppm for an additional 2-year period. These tolerances will expire and be revoked on December 31, 2001. This action is in response to EPA's granting of emergency exemptions under section 18 of the Federal Insecticide, Fungicide, and Rodenticide Act authorizing use of the pesticide on spinach and grass grown for seed. Section 408(l)(6) of the Federal Food, Drug, and Cosmetic Act (FFDCA) requires EPA to establish a time-limited tolerance or exemption from the requirement for a tolerance for pesticide chemical residues in food that will result from the use of a pesticide under an emergency exemption granted by EPA under section 18 of the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA).