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l „ <br /> I <br /> Mork Plan Evaluation of Soil and Ground Water December 4, 1989 <br /> Unocal Station No. 6981, Stockton, California AGS 38032-3N <br /> TABLE 4 <br /> SOIL—VAPOR SURVEY DATA <br /> r� December 4, 1988 <br /> Unocal Service Station No. 2094 <br /> 4707 Pacific Avenue <br /> Stockton, California <br />_ SAMPLE DEPTH BENZENE TOLUENE XYLENES <br /> VP-1 12 <1 <1 <1 <br /> VP-2 12 <1 <1 <1 <br /> VP-3 12 <1 <1 <1 <br /> VP-4 12 <1 <1 <1 <br /> VP-5 12 <1 <1 <1 <br /> VP-5 12 <1 <1 <1 <br /> VP--7 12 2 <1 <1 <br /> VP-6 12 <1 <1 <1 <br /> VP-9 12 <1 <1 <1 <br /> VP-10 12 <1 <i <1 <br /> VP-11 12 <1 <1 <1 <br /> - � VP-12 12 <1 <1 <1 <br /> VP-13 12 :1 <1 <1 <br /> Sample depths are measured in feet. <br /> Concentrations are in parts per million (ppm) . <br /> < = less than the detection limit specified. <br /> Measurements made with a Photovac 10S70. <br /> Fresh and brackish water lakes formed in the valley resulting in deposition of lacustrine clay <br /> - over extensive areas, with higher energy environments, such as rivers and streams, <br /> depositing channel sand and gravel(Department of hater Resources, 1967). Previous work <br /> at this sate by Applied GeoSystems indicates the site is underlain by fluvial sediments <br /> consisting of sand, silt, and clay. <br /> 10 <br />