This regulation establishes a tolerance for combined residues of terbacil in or on watermelon. The Interregional Research Project Number 4 (IR-4), on behalf of the registrant, DuPont Crop Protection, requested this tolerance under the Federal Food, Drug, and Cosmetic Act (FFDCA), as amended by the Food Quality Protection Act of 1996 (FQPA). EPA is also deleting an existing time-limited terbacil tolerance that is no longer needed as a result of this action.