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ADVISORY - ACTIVE SOIL GAS INVESTIGATIONS <br />5) USEPA Method 16 should be used with caution because it is a source-testing <br />method which has limitations, including non-linear detector response, high <br />reporting limits and susceptibility to hydrocarbon interference. <br />8.0 LABORATORY CERTIFICATION <br />The State Water Resources Control Board, Environmental Laboratory Accreditation <br />Program (ELAP), offers certification for soil gas analysis. Laboratories utilizing USEPA <br />Methods 8015B, 8021B, and 8260B for analyses of soil gas samples should obtain <br />ELAP certifications for these methods. Accreditation under National Environmental <br />Laboratory Accreditation Program (NELAP) for USEPA Methods TO-13A, TO-15 and <br />TO-17 for ambient air testing is acceptable as certification for soil gas testing. <br />As of the date of this document, the development of a laboratory certification program for <br />soil gas is in progress in California. Once a certification program is available by the State <br />Water Resources Control Board, laboratories should apply to be certified. Further <br />information concerning laboratory certification is provided in Appendix F. <br />Any laboratory analyzing soil gas samples may be subject to inspection by regulatory <br />agency staff. <br />July 2015 42