CFR > Title 40 - Protection of Environment > CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY > SUBCHAPTER E—PESTICIDE PROGRAMS (Parts 150–181) > PART 180—TOLERANCES AND EXEMPTIONS FOR PESTICIDE CHEMICAL RESIDUES IN FOOD > SUBPART B—Procedural Regulations (§180.7 to §180.41) > 180.9—Substantive amendments to petitions.