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REGLIVEU Fie Q ENVIRONMENTAL vadose zone beneath the dispensers. GHD personnel screened the excavated soils wiW:0, `tAMARTMENT PID to qualitatively assess the presence of volatile organic hydrocarbons. Based and PID readings, soil staining, and noted odors, GHD directed the over -excavation of approximately 5 cubic yards of hydrocarbon bearing soil beneath dispensers D3/4 and D11/12 to 6 and 6.5 fbg, respectively (Figure 2). GHD also collected four -point composite samples by driving 6 -inch steam -cleaned brass tubes into the soil stockpiles generated during the UDC upgrades (Waste -1 and Waste -2) and soil over - excavations (Waste -3). All samples were sealed, labeled, logged on a chain -of -custody form, placed on ice in a cooler and transported to McCampbell Analytical, Inc in Pittsburg, California for analysis. GHD's standard field procedures for compliance sampling are included in Appendix A. Soil sample locations are illustrated on Figure 2. 3.4 Chemical Analyses Soil samples collected were analyzed by McCampbell Analytical, Inc for the following: • Total petroleum hydrocarbons as diesel by Environmental Protection Agency (EPA) Method 8015 modified with silica gel cleanup • Total petroleum hydrocarbon as gasoline (TPHg) by EPA Method 8015 modified • Benzene, toluene, ethylbenzene, and xylenes (BTEX), methyl tertiary butyl ether (MTBE) and naphthalene by EPA Method 8260B • Total lead by EPA Method 6010 (stockpile samples only) Laboratory analytical results for the soil samples are summarized in Table 1. The laboratory analytical reports are included in Appendix B. 3.5 Waste Disposal Soil stockpiled onsite was sampled for waste characterization. Following receipt of analytical data, on January 19, 2016, a total of approximately 25 yards of non -hazardous soil were removed from the site, transported by Integrated Wastestream Management, and disposed of at Altamont Landfill and Resource Recovery Facility in in Livermore, California (Manifest #11109471-001 and 11109471-002, Profile 625607CA). Laboratory analytical results of the soil stockpile and water samples are summarized in Tables 1 and 2, respectively. The laboratory analytical report is included in Appendix B. 4. Results Hydrocarbons were only detected in two (D3/4 and D11/12) of the six compliance soil samples. These two locations were over -excavated an additional 2 to 3 fbg which successfully removed the hydrocarbon bearing soil. No TPHd, TPHg, BTEX, or naphthalene were detected in the two confirmation samples collected from the bottom of the over -excavations. The only residual hydrocarbon detected was 0.018 milligrams per kilogram MTBE in D11/12 at 6.5 fbg. GHD I Report for Chevron —Compliance Sampling and Excavation Report and Station Upgrade Activities 111109471 (2) 12