This regulation establishes an exemption from the requirement of a tolerance for residues of Polyoxyethylene polyoxypropylene mono(di-sec-butylphenyl) ether when used as an inert ingredient in herbicide formulations only, for pre-harvest uses and at no more than 30% by weight in herbicide formulations intended for application to turf. The Joint Inerts Task Force (JITF), Cluster Support Team Number 20, submitted a petition to EPA under the Federal Food, Drug, and Cosmetic Act (FFDCA), requesting an exemption from the requirement of a tolerance. This regulation eliminates the need to establish a maximum permissible level for residues of Polyoxyethylene polyoxypropylene mono(di-sec-butylphenyl) ether.