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Figure 1-2. Analytical results from the survey are presented in Table <br /> 1-1. After the soil-gas survey was completed, HIeinfelder drilled and <br /> sampled three borings and constructed three monitoring wells <br /> (Figure 1-2) Analyses of samples from the boring indicated a very <br /> minimal detection of toluene in one sample The remainder of the <br /> analyses were below the detection limits (Table 1-1) Analysis of <br /> samples of groundwater were all below detection limits (Table 1-1) <br />' Site Setting <br />' The work site is locatred adjacent to the Stockton Deep Water <br /> Channel The land surface in the area of the tank hes approximately <br /> 10 feet above mean sea level. <br /> Site Specific Geology <br /> depth of 30 feet. According Sods encountered to a g to the work <br /> performed by Meinfelder, the subsurface soils have been explored to a <br /> depth of 30 feet The soils consist from the ground surface downward <br /> of clay-silt, clay to silty fine-grained sand, and clayey fine-grained <br /> sand. The overall fine-grained size of the soil is consistent with the <br /> location of the site within the flood plain of the San Joaquin River <br />' <br /> Site Specifie Hydmlogy <br /> During construction of the three monitoring wells (MW-1 to MW-3), <br />' groundwater was encountered at a depth ranging from 9 to 14 feet <br /> Depth to water after development of the wells is unknown, but for at <br /> least well MW-3, the static water level is above the initial level. <br /> HIeinfelder has indicated that a groundwater flow gradient exists <br /> that trends toward the south-southwest Measurement of <br /> groundwater levels on two different occasions by HIeinfelder has <br />' suggested that the groundwater gradient is affected by tidal-induced <br /> water level fluctuations in the nearby deep water shipping channel <br /> 1 <br /> 1-2 <br /> I <br />