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C h <br /> ' C <br /> f <br /> Chevron / Pacific Avenue <br /> February 27, 1967 <br /> SOIL BORINGS <br /> The purpose of the soil boring was to explore the site for <br /> the presence of subsurface hydrocarbon constituents and to obtain <br /> a preliminary definition of the vertical extent of the <br /> constituents, should any be found. Chevron USA requested that <br /> one boring be drilled and a monitoring well be installed if <br /> groundwater was encountered. The one boring was located in the <br /> tank pit area (See Figure 2, Site Plan) and was drilled to a <br /> total depth of 60 feet. <br /> The boring was drilled with a truck mounted drill rig "sing <br /> 7.5-inch O.D. (outside diameter) hollow-stem augers. The <br /> drilling was performed under the supervision of a geologist who <br /> also maintained a continuous log of the materials encountered <br /> (See Appendix 1, Drill Logs) . The presence of hydrocarbon <br /> constituents in soils was evaluated by field inspection and field <br /> analysis using an HNU Photo-ionization Detector. <br /> SOIL SAMPLING <br /> Soil samples were obtained at 5-foot interva7.s beginning at <br /> 5 feet below grade to the bottom of the borings. Samples were <br /> obtained during drilling using a 2.5-inch O.D. split spoon <br /> sampler lined with three 2 x 6 inch brass sample tubes. The <br /> sampler was driven 18 inches ahead of the augers at each sample <br /> point. The collected samples were sealed, capped and packed on <br /> ice in an insulated cooler for subsequent delivery to Sequoia <br /> Analytical Laboratory for analysis. Each sample was labeled with <br /> the boring number, sample number and depth of sample. Soil <br /> 5 <br />