This regulation establishes an exemption from the requirement of a tolerance for residues of 9-octadecenoic acid (9Z)-, sulfonated, oxidized; 9-octadecenoic acid (9Z)-, sulfonated, oxidized, potassium salts; and 9-octadecenoic acid (9Z)-, sulfonated, oxidized, sodium salts, when used as an inert ingredient in antimicrobial pesticide formulations used on food contact surfaces in public eating places, dairy processing equipment and food processing equipment and utensils at a maximum end-use concentration not to exceed 250 parts per million (ppm). Ecolab 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 9-octadecenoic acid (9Z)-, sulfonated, oxidized and its potassium and sodium salts.