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L & M OPERABLE UNIT-THIRD QUARTER 2013 SITE STATUS, REMEDIAL SUMMARY, <br /> AND GROUNDWATER MONITORING REPORT <br /> Soil Vapor Sampling <br /> November 1, 2013 <br /> 4.0 Soil Vapor Sampling <br /> 4.1 PREVIOUS SOIL VAPOR SAMPLING ACTIVITIES <br /> Baseline, startup, and monthly soil vapor sampling results were presented in the report entitled <br /> Soil Vapor Well Installation and Soil Vapor Extraction Start-Up Report for events prior to <br /> October 2005. Monthly soil vapor sampling results for the October 17 and November 18, 2005 <br /> sampling event were presented in the Fourth Quarter and Annual 2005 Site Status, Remedial <br /> Summary, and Groundwater Monitoring Report. The DPE system was shut down for retrofit on <br /> December 12, 2006, and restarted on May 31, 2007. <br /> 4.2 SOIL VAPOR SAMPLING THIRD QUARTER 2013 <br /> On July 19, 2013, soil vapor samples were collected from 13 of the 15 soil vapor monitoring <br /> points located in the adjacent Delta View Apartment complex (APSV locations) and on <br /> undeveloped portions of the Site (UPSV locations). Soil vapor points APSV-2 and APSV-4 were <br /> not sampled due to water infiltration in the sampling tube during the 3Q13 sampling event. Soil <br /> vapor point UPSV-4 was destroyed, in concurrence with the CRWQCB-CVR, during <br /> fourth quarter 2006 due to its location which interfered with the installation of an additional <br /> remediation system on Site. Samples were collected following guidance provided by the <br /> California Department of Toxic Substance Control (DTSC) and Los Angeles RWQCB <br /> Advisory- Active Soil Gas Investigations, dated April, 2012. Soil vapor analytical results from <br /> this monitoring event are presented in Table 22 and Figure 35 and are summarized below. <br /> Laboratory analytical reports for 3Q13 are provided in Appendix J. <br /> 4.2.1 Soil Vapor Sampling <br /> Soil vapor samples UPSV-1, UPSV-2, UPSV-3, UPSV-3-D, UPSV-6, APSV-1, APSV-3, and <br /> APSV-5 through APSV-10, and APSV-10-D were collected and analyzed in the field by <br /> Transglobal Environmental Geochemistry-Northern California (TEG) using a syringe equipped <br /> with a gas-tight fitting attached to a '/4-inch Teflon® tubing inlet at each soil vapor monitoring <br /> point. Once connected, the syringe was used to a purge a calculated volume of air based on <br /> the diameter and depth of inlet tubing. Upon purging each vapor point, the air sample was <br /> collected and immediately analyzed by TEG, using a California certified onsite mobile <br /> laboratory. Collected samples were analyzed for the following: <br /> • TPHg using EPA Method 826013; and <br /> • BTEX compounds, fuel oxygenates (MTBE, DIPE, EtBE, TBA, TAME), and naphthalene, <br /> using EPA Method 8260B. <br /> Duplicate samples and were collected from during the 3Q13 event. <br /> i 4.1 <br />