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TO E RO E K SOP No.026,REV.1 ASSOCIATES,INC INDOOR AIR AND SUB-SLAB SOIL GAS SAMPLING METHODS I PAGE 1 1.0 BACKGROUND Indoor air and sub-slab soil gas samples can be collected using several methods. This standard operating procedure (SOP) presents sample collection procedures for collecting time-integrated, paired indoor air and sub-slab soil gas samples in stainless-steel SUMMA® canisters. Procedures for collection with syringes, Tedlar® bags, and/or glass bulbs are not included in this SOP. SUMMA®canisters are best suited for shipping samples to a full-service laboratory. Sub-slab sampling is conducted to determine the concentrations of volatile organic compounds (VOCs) in soil gas underlying a structure with slab flooring. The results of the sub-slab sampling can be used to determine the potential for vapor intrusion into the overlying structure. Indoor air sampling is used to assess the presence of vapor-forming chemicals in indoor air and to determine if vapor intrusion is occurring. Time-integrated samples are often required for highly variable environments such as in a residence or occupational setting. This SOP outlines the methods used for the time-integrated, paired, or concurrent sampling of indoor air and subsurface soil gases beneath slabs to provide multiple lines of evidence and support findings about the relative contributions of vapor intrusions and background sources to indoor air. It should be noted that additional outdoor ambient samples may also be concurrently collected to address specific needs of the project. There are standard (i.e., typically applicable) operating procedures which may be varied or changed as required, dependent on the site conditions, equipment limitations imposed by the procedure. In all instances, the procedures ultimately employed should be documented and associated with the final report. Mention of trade names or commercial products does not constitute United States Environmental Protection Agency) U.S. EPA endorsement or recommendation for use. 1.1 PURPOSE The purpose of this SOP is to provide guidance for the use of SUMMA® canisters for paired indoor air and sub-slab soil gas sample collection.