This regulation establishes an exemption from the requirement of a tolerance for residues of 2-pyrrolidinone, 1-butyl- (CAS Reg. No. 3470-98-2) when used as an inert ingredient (solvent/cosolvent) in pesticide formulations applied to growing crops only at a concentration not to exceed 30% by weight under EPA regulations. SciReg. Inc. on behalf of Taminco U.S., Inc. a subsidiary of Eastman Chemical Company submitted a petition to EPA under the Federal Food, Drug, and Cosmetic Act (FFDCA), requesting the establishment of an exemption from the requirement of a tolerance. This rule eliminates the need to establish a maximum permissible level for residues of 2-pyrrolidinone, 1-butyl- when used in accordance with the regulations.