{"data":{"id":"us/40-cfr-appendix-iv-to-part-257","jurisdiction":"us","citation":"40 CFR Appendix IV to Part 257","heading":"Appendix IV to Part 257—Constituents for Assessment Monitoring","body":"Common name 1\nAntimony\nArsenic\nBarium\nBeryllium\nCadmium\nChromium\nCobalt\nFluoride\nLead\nLithium\nMercury\nMolybdenum\nSelenium\nThallium\nRadium 226 and 228 combined\n1 Common names are those widely used in government regulations, scientific publications, and commerce; synonyms exist for many chemicals.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER I—SOLID WASTES","PART 257—CRITERIA FOR CLASSIFICATION OF SOLID WASTE DISPOSAL FACILITIES AND PRACTICES"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-40.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:04Z","sha256":"b51da21134d76ccb5a5d0453bfa2f36af410668bf30be6868f6ff434d76bbe92","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-appendix-iii-to-part-257","next":"us/40-cfr-258.1"},"notice":"GroundRules: Original legal text. Not legal advice."}