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Mr. Jeff Tierney, E.I.T. GeOSynteC D <br /> July 1, 2022 consultants <br /> Page 5 <br /> Groundwater Sampling <br /> Within 48 hours after completion of the soil vapor sampling, groundwater samples will be <br /> collected from groundwater monitoring wells MW-27, MW-5B and MW-7B for analysis of 1,2- <br /> DCP, 1,2,3-TCP, and chloroform, and DBCP in the sample from MW-5B (per the site's <br /> Monitoring and Reporting Program6, only samples from MW-5B are analyzed for DBCP). <br /> Groundwater sampling will be performed after conclusion of soil gas sampling to avoid potential <br /> issues associated with perturbing the soil gas in the vadose zone near to the SVPs, which may <br /> occur during the purging and/or sampling of the monitoring wells. The groundwater sampling will <br /> be performed as part of the routine Q3-2022 groundwater monitoring event. The specific procedure <br /> that will be used for sampling monitoring wells MW-27, MW-5B and MW-7B is described in <br /> sections 4.5.1 and 4.5.2 of the Work Plan. Groundwater samples will be submitted under chain- <br /> of-custody procedures to a California-certified analytical lab, Eurofins-Calscience of Garden <br /> Grove, California, for analysis of the selected VOCs noted above. <br /> Investigation-Derived Waste <br /> Soil cuttings, purge water and any other investigation-derived waste (IDW) will be temporarily <br /> stored in 55-gallon drums at the site. The IDW will be profiled and disposed of at an appropriate <br /> off-site facility. <br /> LABORATORY ANALYSIS AND DATA VALIDATION <br /> Soil Samples <br /> The soil samples collected during the installation of the off-site SVPs will be analyzed at Cooper <br /> Testing for the following: <br /> • Total porosity by American Society for Testing and Materials International (ASTM <br /> International) D7263; <br /> • Moisture content by ASTM International D2216; <br /> • Volumetric water and air content; <br /> • Bulk density by ASTM International D7263b; and <br /> • Grain size by ASTM International D422. <br /> Soil Vapor Samples <br /> Soil vapor samples collected from each of the six SVPs will be submitted under standard chain- <br /> of-custody procedures to Eurofins Air Toxics for analysis of 1,2-DCP, 1,2,3-TCP, DBCP, and <br /> chloroform by United States Environmental Protection Agency (USEPA) Method TO-15 and <br /> 6 California Regional Water Quality Control Board.2013.Monitoring and Reporting <br /> Order No.R5-2013-0800,January 23,2013. <br /> engineers I scientists I innovators <br />