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ADVISORY - ACTIVE SOIL GAS INVESTIGATIONS <br />FOREWORD <br />In a coordinated effort, the Department of Toxic Substances Control, the Los Angeles <br />Regional Water Quality Control Board, and the San Francisco Regional Water Quality <br />Control Board have jointly developed the Advisory— Active Soil Gas Investigations. This <br />document attempts to ensure that high quality data used for regulatory decision making <br />are collected during active soil gas investigations using consistent methodologies. The <br />document was reviewed by other government organizations and the regulated <br />community. Their comments were considered and the Advisory changed in response to <br />those comments. The Advisory also addresses recent developments in the field of soil <br />gas collection. As additional information and experience are obtained, this Advisory may <br />be modified as appropriate. <br />The information in the Advisory should not be considered as regulations. Mention of <br />trade names or commercial products does not constitute the agency endorsement or <br />recommendation. <br />If you have any questions or comments regarding this document, please contact <br />Theodore Johnson of DTSC at via email at tiohnsondtsc.ca .qov. <br />ii