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SOP-SG-1 <br />SOIL GAS WELL SAMPLING VVE-T <br />STANDARD OPERATING PROCEDURE LniroarmWSerriceF LInhw1ogy <br />2.0 SAMPLE COLLECTION <br />The purpose of the vapor well sampling procedure is to collect samples from existing vapor wells <br />that are representative of conditions. Details of the vapor well sampling protocols are presented <br />below. <br />2.1 APPLICABLE GUIDANCE <br />Vapor samples will be collected following the October 2011 California Environmental Protection <br />Agency's (CalEPA) Department of Toxic Substances Control (DTSC) Final Guidance for the <br />Evaluation and Mitigation of Subsurface Vapor Intrusion to Indoor Air (Vapor Intrusion <br />Guidance) and CalEPA's 2015 Advisory Active Soil Gas Investigation and whole gas sampling <br />technique as outlined in ASTM D 5466 Standard Test Method for Determination of Volatile <br />Organic Chemicals in Atmospheres — Canister Sampling Methodology (ASTM D 5466). <br />2.2 SAMPLING EQUIPMENT <br />Prior to the site visit, equipment and supplies will be collected that are appropriate for the site <br />conditions. An equipment and supply checklist will be filled out prior to mobilization to the site. <br />Details of the types of equipment needed for sample collection are provided below. <br />2.2.1 Sampling Devices <br />The vapor well samples collected using Summa canister whole gas sampling technique will be <br />conducted as outlined in ASTM D 5466. The crawlspace samples will be collected using <br />laboratory -prepared one -liter passivated stainless steel Summa canisters delivered by the <br />analytical laboratory with approximately 30 -inches of mercury vacuum. The vacuum within the <br />Summa canisters will be measured before sample collection to document the canister <br />atmosphere. <br />3 <br />