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SOP -SG -1 <br />SOIL GAS WELL SAMPLING <br />STANDARD OPERATING PROCEDURE <br />3.0 REFERENCES <br />)AEST <br />i immmW SerriceF & rnfiwlogy <br />ASTM, Standard Guide for Sample Chain -of -Custody Procedures D 4840-99 (ASTM D 4840). <br />ASTM, Standard Test Method for Determination of Volatile Organic Chemicals in Atmospheres <br />- Canister Sampling Methodology (ASTM D 5466). <br />CalEPA, Advisory Active Soil Gas Investigation, July 2015 (CalEPA, 2015). <br />DTSC, Guidance for the Evaluation and Mitigation of Subsurface Vapor Intrusion to Indoor Air <br />(Vapor Intrusion Guidance), October 2011 (DTSC, 2011). <br />USEPA, Compendium Method TO -17, Determination of Volatile Organic Compounds in <br />Ambient Air Using Active Sampling Onto Sorbent Tubes, EPA/625IR-961010b, January <br />1999 (USEPA, 1999). <br />7 <br />