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MCKOMNUND <br /> Oxygen <br /> In addition, the soil gas samples will be analyzed for the selected leak detection compound <br /> (helium) used during sampling activities. A second moral of soil gas sampling will be performed <br /> during the second quarter of 2019. The sampling will be performed concurrently with second <br /> quarter 2019 groundwater monitoring event. <br /> 3.2 TASK 2 — SOIL INVESTIGATION <br /> Soil horings will be advanced near former UST locations in ceder to collect samples for chemical <br /> analysis. A total of five borings are proposed: one in the vicinity of Tanks I, 2, and 3; one at the <br /> location of Tanks 4 and 5; one at the location of Tanks ], 8, and 9; and two at the location of Tanks <br /> I I through 14 (Figure L1). Bach of these locations are described in more detail below. It is noted <br /> that the RWQCB has requested that shallow soil samples be collected at depths of 0-5 fort bgs and <br /> 0-10 Well bgs. Soil borings will be located just outside of the former tank excavation fomprim a in <br /> ocher to avoid sampling hackfill material room these depths. <br /> • Tanks I thmugh 3: A single soil boring will h s advanced to a claims of at least 27 feet hgs <br /> o collect a soil sample for MTBG analysis. This depth corresponds to the reported depth <br /> of the UST excavation in this area and may be adjusted baud on Iilhological observations <br /> during drilling. In addition, samples will be collected fmm the 0-5 and 5-10 fat hgs <br /> intervals. The boring will be located near existing boring 1111-3, which had elevated TPH <br /> concentrations. in order to collect a representative sample. Soil samples than this boring <br /> will be analyzed for TPHg, TPHd, tool oil and grease (TOG), MTRF volatile organic <br /> compounds (VOCs), SVOCs, polycyclic aromatic hydrocarbons (PAHs), polychlorinmed <br /> biphenyls (PCBs), and Title 22 metals. <br /> • Tanks 4 and 5: A single soil boring will be advanced W a depth of approximately 10 fret <br /> bgs. Soil samples will bs collected from the 0-5 and 5-10 feet bgs intervals for analysis of <br /> TPHg, MTBE, VOCs, and PAHS. <br /> • Tanks6thmueh 9: One boring will be advanced at the location of Tanks 7 through 9. The <br /> boring insulted to address 'Tanks I through 3 have above) will also be used m address"Tank <br /> 6. 'Ihe herrings will be advanced to a minimum depth of 27 first bgs. Samples will he <br />