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ADVISORY - ACTIVE SOIL GAS INVESTIGATIONS <br />ACKNOWLEDGMENTS <br />April 2012 Version <br />Preparation of this Advisory was achieved through the efforts of the following <br />individuals at the California Environmental Protection Agency: <br />Rafat Abbasi <br />Elizabeth Allen <br />Bill Bosan <br />Phil Chandler <br />Craig Christmann <br />Dan Gallagher <br />Joe Hwong <br />Theo Johnson <br />Dot Lofstrom <br />Lynn Nakashima <br />Yue Rong <br />Thizar Williams <br />Peter Wong <br />Department of Toxic Substances Control <br />San Francisco Bay Regional Water Quality Control Boar& <br />Department of Toxic Substances Control <br />Department of Toxic Substances Control <br />Department of Toxic Substances Control <br />Department of Toxic Substances Control <br />Department of Toxic Substances Control <br />Department of Toxic Substances Control <br />Department of Toxic Substances Control <br />Department of Toxic Substances Control <br />Los Angeles Regional Water Quality Control Board <br />Los Angeles Regional Water Quality Control Board <br />Department of Toxic Substances Control2 <br />Also, David Berry, Ken Chiang, Rebecca Chou, Bryan Eya, Jeffrey Hu, and Christine <br />Papagni provided invaluable assistance in the revision of this document. The <br />California Environmental Protection Agency thanks them for their efforts. <br />This document was developed jointly under the direction of Debbie Raphael, Director, <br />Department of Toxic Substances Control, Samuel Unger, Executive Officer, Los <br />Angeles Regional Water Quality Control Board, and Bruce Wolfe, Executive Officer, <br />San Francisco Regional Water Quality Control Board. Without their support, completion <br />of this document would not have been possible. <br />July 2015 Version <br />The Advisory was revised to address recent developments in the field of soil gas <br />collection. The Soil Gas Workgroup thanks all contributors for their efforts which <br />improved the Advisory through their thoughtful observations. <br />Currently with United States Environmental Protection Agency Region X. <br />2 Currently with California Air Resources Board. <br />July 2015 iii