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U.S. Code of Federal Regulations
Regulations most recently checked for updates: Aug 28, 2025
All Titles
Title 21
Chapter I
Part 509
Subpart B - Subpart B—Tolerances for Unavoidable Poisonous or Deleterious Substances
§ 509.30 - Temporary tolerances for polychlorinated biphenyls (PCB's).
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