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H <br /> SITE CLOSURE REPORT <br /> General Mills Inc <br />. <br /> 2000 West Turner Road <br /> Lodi, Califorrua <br /> Delta Project No D092-708 <br /> Page 5 <br /> layer is present The trace of the geologic cross-sections and the cross-sections illustrating the inferred <br /> subsurface conditions at the site and are presented in Figures 6, 7, and 8, respectively <br /> 3 2 Site Hydrogeology <br /> Depth to ground water at the site has ranged from approximately 39 1 to 41 9 feet below the tops of the <br /> well casings Cumulative ground water table measurements are compiled in Table 1, and graphical <br /> representations of the low and high water elevations are presented in Figures 7 and 8 The direction of <br /> ground water flow has consistently been toward the southwest at an approximate hydraulic gradient of <br /> 0 003 to 0 005 Water table contour maps presenting the depth to water, gradient and flow direction <br /> during the November 1994 and February 1995 measuring events are presented as Figures 9 and 10, <br /> respectively <br /> 3 3 Distribution of Petroleum Hydrocarbons in Soil <br /> In October 1991, the three USTs were excavated and removed from site Soil was excavated to a depth <br /> of approximately 15 feet bsg Following excavation, Water Works of Escalon, California, collected nine <br /> soil samples from the base of the tank basin excavation and submitted them to a certified laboratory for <br /> analyses of BTEX, and high boiling point hydrocarbons (TPH as diesel No 6) Benzene was not detected <br /> in any of the soil samples, however, concentrations of TPH as diesel No 6 ranged from below the <br /> laboratory's reporting limits to 820 ppm The approximate soil sample locations are presented in <br /> Figure 3 and the laboratory analyses results are summarized m Table 2 Following the excavation of soil, <br /> the tank excavation was backfilled to approximately 5 feet bsg with well-graded gravel, and the remaining <br /> 5 feet was backfilled with silty sand <br /> On May 12, 1992, monitoring wells MW-1, MW-2, and MW-3 were installed The locations of the <br /> ground water monitoring wells are shown in Figure 4 Soil samples were collected at 5-foot intervals <br /> from the borings and were classified according to the Unified Soil Classification System Field screening <br /> of the soil samples included both visual inspections and analyses for the presence of organic vapors with <br /> an hNu photoionizatnon detector (PID) Soil staining indicative of fuel contaminated soils was not <br /> i <br /> RPT157 515 <br />