This regulation establishes an exemption from the requirement of a tolerance for residues of 1,2-propanediol, 3-[3-[1, 3, 3, 3- tetramethyl-1-[(trimethylsilyl)oxy]-1-disiloxyanyl] propoxy]- (CAS Reg. No. 70280-68-1) when used as an inert ingredient (antifoaming agent) in pesticide formulations applied to growing crops at a maximum concentration not to exceed 5% by weight. Exponent, on behalf of ISK Biosciences 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 1,2-propanediol, 3-[3-[1, 3, 3, 3-tetramethyl-1-[(trimethylsilyl)oxy]-1-disiloxyanyl] propoxy]-.