CFR›Title 40›Chapter I›Part 312 ContainsSubparts A–CCorpusDaily eCFRDisplayed edition2026-04-27Last updated2026-04-27 PART 312—INNOCENT LANDOWNERS, STANDARDS FOR CONDUCTING ALL APPROPRIATE INQUIRIES Subparts A Subpart A—Introduction Section 312.1 B Subpart B—Definitions and References Sections 312.10–312.11 C Subpart C—Standards and Practices Sections 312.20–312.31 AuthoritySection 101(35)(B) of CERCLA, as amended, 42 U.S.C. 9601(35)(B).Source70 FR 66107, Nov. 1, 2005, unless otherwise noted. Previous 311 Part 311—Worker Protection Next 350 Part 350—Trade Secrecy Claims for Emergency Planning and Community Right-to-Know Information: and Trade Secret Disclosures to Health Professionals