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Soils from the upper-most sample liner and the small soil plug from the base of the sample drive <br /> were placed in a clear plastic bag for field screening purposes. Samples were evaluated in the <br /> field for the possible presence of volatile organic compounds using a portable organic vapor <br /> F monitor/photo-ionization device(OVM/PID). The soil samples placed in clean, sealed plastic <br /> bags were allowed to stabilize in the bag for approximately one minute, then the OVM/PID <br /> probe was inserted into a portion of the bag to monitor for the possible presence of organic <br /> vapors emitting from the samples. Calibration of OVM/PID unit was performed by the vendor <br /> using butadiene gas, prior to rental.. Soil sample descriptions and OVM/PID readings are <br /> provided on field soil boring lag forms, which are found in Appendix A to this Addendum 1 <br /> Report. <br /> Following the installation of the soil boring, the borehole space was backfilled with a <br /> l cement/bentonite grout seal. Ground backfilling was accomplished using a large diameter hose <br /> and drill-rig-mounted pump. Borehole backfilling/sealing activities were inspected by a <br /> PHS/EHD inspector. <br /> Investigation-derived soil cuttings generated during the Site Assessment field activities were <br /> f collected and placed in 55-gallon drums. Subsequently, the drums were relocated, labeled and <br /> stored on-site at the north end of the Brine Yard (Figure 2) for disposition by others following <br /> receipt of analytical results. <br /> 3.2 LABORATORY ANALYTICAL METHODS <br /> In accordance with the Work Plan, Shasta Analytical, a California certified laboratory facility in <br /> Redding, analyzed selected soil samples_ Soil samples were analyzed for MTBE and other <br /> gasoline oxygenates using USEPA Method 8260_ Soil samples were also analyzed for BTEX <br /> gasoline constituents using EPA Method 8020. The laboratory analytical results are discussed in <br /> Section 4.0 and summarized on Table 1. Copies of the Shasta Analytical laboratory reports are <br /> #, provided in Appendix B. <br /> �f <br /> 1 <br /> I <br /> * DFT00161.SICPHS.AMC.062066 6 <br />