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ACKNOWLEDGMENTS <br /> Preparation of this Advisory was achieved through the efforts of the following <br /> individuals at the California Environmental Protection Agency: <br /> Rafat Abbasi Department of Toxic Substances Control <br /> Elizabeth Allen San Francisco Bay Regional Water Quality Control <br /> Board <br /> David Berry Department of Toxic Substances Control <br /> Phil Chandler Department of Toxic Substances Control <br /> ADVISORY — ACTIVE SOIL GAS INVESTIGATIONKen Chiang Department of <br /> P Toxic Substances control <br /> Craig Christmann Department of Toxic Substances Control <br /> Rebecca Chou Los Angeles Regional Water Quality Control Board <br /> Bryan Eye ry Y Department of Toxic <br /> P Substances Control <br /> Dan Gallagher Department of Toxic Substances Control <br /> Jeffrey Hu Los Angeles Regional Water Quality Control Board <br /> Joe Hwon <br /> g Department of Toxic Substances Control <br /> Comment period open until April 15,2010. Submit comments to: Theo Johnson Department of Toxic Substances Control <br /> Dot Lofstrom Department of Toxic Substances Control <br /> Theo Johnson Lynn Nakashima Department of Toxic Substances Control <br /> Department of Topic Substances Control Christine Papagni Department of Toxic Substances Control <br /> 5796 Corporate Avenue Yue Ron <br /> Cypress,CA 90630 9 Los Angeles Regional Water Quality Control Board <br /> Thizar Williams Los Angeles Regional Water Quality Control Board <br /> tjohnson@dtsc.ca.gov Peter Wong Department of Toxic Substances Control <br /> The committee would like to acknowledge the contribution from Sharon Fair formerly <br /> California Environmental Protection Agency of the Department of Toxic Substances Control(DTSC)and currently of Los Angeles <br /> Unified School District. We also thank everyone from outside of Agencies For their <br /> substantial contribution towards the completion of this document. <br /> Disclaimer <br /> This document is a compilation of available information,knowledge,experience,and <br /> best practices regarding soil gas sampling for site assessment and remediation. This <br /> document does not contain regulatory requirements. In general,this document should <br /> be used as a reference. Differences may exist between the recommendations in this <br /> document and what is appropriate under site-specific conditions. The recommendations <br /> March 2010 do not represent the positions or opinions of the Agencies. This document does not <br /> represent endorsement of practitioners or products mentioned in the document by the <br /> participating government agencies. <br /> J <br /> 3/3/2010 _i_ <br /> 3/3/2010 -ii- <br />