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L � <br /> US EPA (Dominic DiGiulio, Ph.D.), 2004. Draft Standard Operating Procedure (SOP) <br /> for Installation of Sub-Slab Vapor Probes and Sampling Using EPA Method TO-15 to <br /> Support Vapor Intrusion Investigations. <br /> ETC Soil Vapor Sampling Technical Toolkit 26 <br /> Version 1.4,September 7, 2005 <br />