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SOP No.021,REV.1 <br /> TO E RO E K <br /> SOIL GAS SAMPLING METHODS <br /> „ AssoCI ns INC. <br /> PAGE 1 <br /> 1.0 BACKGROUND <br /> Soil gas samples can be collected using several methods. This standard operating procedure(SOP) <br /> presents sample collection procedures for collecting soil gas samples in plastic Tedlar® bags, <br /> syringes, stainless-steel Summa canisters, and sorbent tubes. Procedures for collection with glass <br /> bulbs are not included in this SOP. Tedlar® bags are best suited for on-site or near-site chemical <br /> analysis, syringes are best suited for on-site chemical analysis, and Summa canisters and sorbent <br /> tubes are best suited for shipping samples to a full-service laboratory. <br /> 1.1 PURPOSE <br /> The purpose of this SOP is to provide guidance for the use of Tedlar® bags, syringes, Summa <br /> canisters, and sorbent tubes for soil gas sample collection. <br /> 1.2 SCOPE <br /> This SOP applies to all personnel collecting soil gas samples in Tedlar® bags, syringes, Summa <br /> canisters, or sorbent tubes. The site-specific work plan and sampling plan should be followed <br /> during soil gas sampling activities. <br /> 1.3 DEFINITIONS <br /> Soil gas: The gases or atmosphere filling the void spaces in soils and unconsolidated sediments. <br /> These gases may all be of natural origin, but manmade contaminants or byproducts may be <br /> present in detectable quantities. <br /> 1.4 REFERENCES <br /> Department of Toxic Substances Control (DTSC). 2003. "Advisory — Active Soil Gas <br /> Investigations."January 28. Available Online at: <br /> <http://www.dtsc.ca.gov/LawsRegsPolicies/Policies/SiteCleanup/upload/SMBR_ADV_a <br /> ctivesoil gasinvst.pdf> <br /> U.S. Environmental Protection Agency(EPA). 1990. "General Precautions in the Use of Canister <br /> Sampling for Measuring VOCs in Ambient Air." Office of Solid Waste Emergency <br /> Response (OSWER). Bulletin Board). <br /> EPA. 1999. Compendium of Methods for the Determination of Toxic Organic Compounds in <br /> Ambient Air — Second Edition. Atmospheric Research and Exposure Assessment <br /> Laboratory, Research Triangle Park,NC. 625/R-96/010b. January <br />