This regulation establishes an exemption from the requirement of a tolerance for residues of ammonium persulfate (CAS Reg. No.7727- 54-0) when used as an inert ingredient (preservative) in pesticide formulations applied to growing crops and raw agricultural commodities after harvest, etc.) at a concentration not to exceed 0.05% by weight. Exponent, Inc., on behalf of Becker Underwood, Inc. submitted a petition to EPA under the Federal Food, Drug, and Cosmetic Act (FFDCA), requesting establishment of an exemption from the requirement of a tolerance. This regulation eliminates the need to establish a maximum permissible level for residues of ammonium persulfate under the approved conditions.