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Table 3-1 <br /> Sieve Analysis <br /> Soil Boring <br /> (% Retained) <br /> SB SB MW MW MW <br /> Soil Type Sieve Mesh Dis-4-21 DIS-4-40 DIS-1-55 DIS-1-74 DIS-1-75 <br /> Gravel #4 NA NA 0 0 0 <br /> l #10 NA NA 0 0 0 <br /> Sand #16 NA NA 1 0 1 <br /> f #30 NA NA 2 2 5 <br /> #50 NA NA 4 3 18 <br /> #100 NA NA 15 17 30 <br /> #200 18 25 45 35 39 <br /> Silt or Clay c#200 82 75 55 65 61 <br /> NA = Not analyzed <br /> I <br /> Continuous soil core samples collected from the mud rotary boring, MW-DIS-7D, <br /> indicate silty sandy clays extend down to 110 feet bgs. A clean, coarse sand was <br /> encountered from 110 feet to 145 feet bgs. <br /> Hydrology <br /> Groundwater Occurrence <br /> 1 . <br /> The groundwater table in the vicinity of the former Disco tanks presently exists at <br /> approximately 75 feet bgs. The shallow groundwater occurs within fine sandy silts, <br /> j' clayey silts, and coarse sand. No confining clay layer or perched water was observed <br /> during the investigation. <br /> jGroundwater also occurs at greater depths in water-producing sands more than <br /> 150 feet below ground surface. These sands form the aquifer that is developed by <br /> numerous water-supply wells in the Stockton area. <br /> Water Levels <br /> l Groundwater levels have been measured in the monitoring wells on three occasions in <br /> September and October 1991 (Table 3-2). Water levels in these wells appear to be <br /> influenced by the three Del Monte Plant 33 groundwater production wells. A <br /> groundwater level data logger (Hermit) was installed to record groundwater level <br /> fluctuations in Monitoring Well MW-DIS-3 for several days during the peach canning <br /> season (Figure 3-3). No rainfall occurred during the recording period. The <br /> groundwater level was observed to fluctuate by as much as 0.5 feet in 24 hours. <br /> Monitoring Well MW-DIS-3 is 700 feet from the closest Del Monte production well. <br /> SF031604\RP1006.51 3-4 <br />