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i <br /> r Gray Davis,Governor ""' <br /> Winston H. Hickox,Agency Secretary t <br /> California Environmental Protection Agency1-1 <br /> .`�", ' <br /> Department of Toxic Substances Control California Regional Water Quality Control Board <br /> Edwin F. Lowry,Director Los Angeles Region <br /> 1011 N. Grandview Avenue 320 W.4th Street, Suite 200 <br /> Glendale,California 91201 Los Angeles, California 90013 <br /> Phone(818)551-2800 Phone(213)576-6600 <br /> FAX(818)551-2832 FAX(213)576-6640 <br /> www.dtsc.ca.gov www.swrcb.ca.gov/rwgcb4 <br /> January 28, 2003 <br /> To: Interested Parties <br /> ADVISORY—ACTIVE SOIL GAS INVESTIGATIONS <br /> In a coordinated effort, the Department of Toxic Substances Control (DTSC)and the California <br /> Regional Water Quality Control Board—Los Angeles Region (LARWQCB) have jointly developed <br /> the "Advisory—Active Soil Gas Investigations" (see the attached). This document is to ensure that <br /> consistent methodologies are applied during active soil gas investigations to produce high quality <br /> data for regulatory decision-making. The document has been reviewed by other government <br /> organizations and by the soil gas consulting community. Their comments have been considered <br /> and, where appropriate, incorporated in the document. This is an on-going effort to streamline the <br /> characterization of gas phase contaminant sites. As additional knowledge and experience are <br /> obtained, this Advisory may be modified as appropriate. <br /> This document is issued by DTSC and LARWQCB as an Advisory subject to review and revision <br /> as necessary. The information in this Advisory should not be considered as regulations. <br /> Mention of trade names or commercial products does not constitute the Agency's endorsement <br /> or recommendation. <br /> If you have any questions regarding this document, please contact the joint-agency project <br /> coordinator Mr. Joe Hwong, of DTSC, at (714)484-5406. <br /> Sincerely, <br /> Edwin F. Lowry Dennis A. Dickerson <br /> Director Executive Officer <br /> Department of Toxic Substances Control California Regional Water Quality Control Board <br /> Los Angeles Region <br /> Enclosure <br /> The energy challenge facing California Is real. Every Californian needs to take Immediate action to reduce energy consumption. <br /> For a list of simple ways you can reduce demand and cut your energy costs,see our Web-site at www.dtsC.".gov. <br /> Printed on Recycled Paper <br />