{"data":{"id":"us/40-cfr-761.253","jurisdiction":"us","citation":"40 CFR 761.253","heading":"Chemical analysis.","body":"(a) Select applicable method(s) from the following list to extract PCBs and determine the PCB concentration from the standard wipe sample collection medium: SW-846 Method 3540C, Method 3550C, Method 3541, Method 3545A, Method 3546, or Method 8082A (all standards incorporated by reference in § 761.19). Modifications to the methods listed in this paragraph or alternative methods not listed may be used if validated under Subpart Q of this part or authorized in a § 761.61(c) approval.\n(b) Report all PCB sample concentrations in µg/100 cm 2 (16 square inches) of surface sampled. If sampling an area smaller than 100 cm 2, report converted sample concentrations in accordance with § 761.243(b).","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER R—TOXIC SUBSTANCES CONTROL ACT","PART 761—POLYCHLORINATED BIPHENYLS (PCBs) MANUFACTURING, PROCESSING, DISTRIBUTION IN COMMERCE, AND USE PROHIBITIONS","Subpart M—Determining a PCB Concentration for Purposes of Abandonment or Disposal of Natural Gas Pipeline: Selecting Sample Sites, Collecting Surface Samples, and Analyzing Standard PCB Wipe Samples"],"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":"31b1a1e8c7b276b1c6fd5bcdc2d88c672711070f2dd7ceb894298082cba1dc06","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-761.250","next":"us/40-cfr-761.257"},"notice":"GroundRules: Original legal text. Not legal advice."}