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Project Number 2098RV45 November 30.2017 <br /> will be prepared to evaluate if the shipping and handling procedures are introducing <br /> contaminants into the samples, and to determine if cross contamination in the form of <br /> VOC migration has occurred between the collected VOC samples. Trip blank <br /> containers and media will be the same as site samples. At least one (1) duplicate <br /> sample per laboratory per day will be collected. Duplicate samples will be collected <br /> from areas of concern in separate sample containers, at the same location and depth. <br /> Duplicate samples will be collected immediately after the original sample. Laboratory <br /> control samples (LCS) and dilution procedure duplicates (DPD) will handled and <br /> analyzed in accordance with the most recent ASGI. EzC will be prepared to collect <br /> split samples (for analysis by another laboratory) with the CRWQCB, if requested. <br /> 4.8.2 Laboratory Certification and Analysis <br /> EzC will have the samples analyzed by EPA Method TO-15 at a certified analytical <br /> laboratory. <br /> 4.8.3 Detection Limits for Target Compounds <br /> Analytical equipment calibration will be in accordance with the most current ASGI. <br /> Detection limits will be such that the Environmental Screening Levels (Soil Gas <br /> Screening Levels) (San Francisco Bay Area RWQCB, February 2016)) for evaluation of <br /> potential vapor intrusion into indoor air allow will be met, as follows: <br /> Vapor Screening ESL's <br /> CHEMICAL Micrograms per Parts per billion - Micrograms per <br /> cubic meter (µg/m3) volume (ppbV) liter (µg/L) <br /> PCE 2.4E+02 35.4 0.24 <br /> TCE 2.4E+02 44.7 0.24 <br /> Cis-1,2-DCE 4.2E+03 1060 4.2 <br /> VC 4.7E+00 0.00184 0.0047 <br /> The DL for leak check compounds will be 0.025 µg/L or less. For results with a high <br /> DL reported (e.g., due to matrix interference or dilution), the laboratory will provide a <br /> written explanation. Re-sampling and analyses will be conducted at the appropriate <br /> DL for a specific compound if requested by CRWQCB staff. <br /> 4.8.4 Sample Handling <br /> Exposure to light and changes in temperature and pressure will accelerate sample <br /> degradation. To protect sample integrity soil-gas samples will not be chilled, will not <br /> be subjected to changes in ambient pressure, and shipping of sample containers by <br /> air will be avoided, if possible. If condensation is observed in the sample container, <br /> the sample will be discarded and a new sample will be collected. <br /> 4.8.5 Holding Time <br /> All soil gas samples will be collected in Summa canisters and will be analyzed at <br /> ProVera Analytical Laboratories, Inc. (State Certification #2606) in Roseville, <br /> California within 14 days after collection. <br /> E2C Remediation 14 <br />