This regulation establishes an exemption from the requirement of a tolerance for residues of the plant growth regulator 1- aminocyclopropane-1-carboxylic acid (1-ACC) in or on apples and stone fruit when used in accordance with good agricultural practices. Valent BioSciences, LLC., submitted a petition to EPA under the Federal Food, Drug, and Cosmetic Act (FFDCA), requesting an exemption from the requirement of a tolerance for residues of the plant growth regulator 1-aminocyclopropane-1-carboxylic acid (1-ACC) in or on apples and stone fruit when used in accordance with good agricultural practices. This regulation eliminates the need to establish a maximum permissible level for residues of 1-aminocyclopropane-1-carboxylic acid (1-ACC).