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Site Characterization Report <br /> ABF Freight System,Inc <br /> Manteca California Pae 10 <br /> . 3.7 Health and Safety <br /> All work for the investigation was conducted in accordance with the site specific safety and <br /> health plan All work was conducted in accordance with CFR 1910 120 and CFR 19010 126 and <br /> all on-site employees were 40-hour OSHA trained, with current 8-hour refreshers and yearly <br /> medical physicals <br /> 4.0 INVESTIGATION FINDING <br /> Logs of the soil borings drilled at the site are presented in Appendix 6 Geologic cross sections <br /> depicting the subsurface soils encountered at the site are presented as Figures 4 and 5 A <br /> discussion of subsurface soil and groundwater conditions encountered during the fieldwork, as <br /> well as analytical laboratory results are presented in the following sections <br /> 4.1 Subsurface Conditions <br /> 4 1 1 Soil Lithology <br /> Soils beneath the subject site consist primarily of medium-grained sands, generally loose and <br /> becoming denser with depth The primary exception to this soil type was a lens of silty clay with <br /> fine grain sands located from approximately 20 to 22 feet bsg This layer was encountered at <br /> . each boring location <br /> 4 1 2 PTD Readin <br /> Soil samples were screened for the presence of volatile organic compounds using a PID The <br /> PID readings are presented on the soil boring logs in Appendix 6 PID readings were not <br /> detected at concentrations greater than 0 1 parts per million (ppm) in any of the samples <br /> collected <br /> 413 Groundwater <br /> Groundwater was encountered at each boring at approximately 10 to 11 feet below ground <br /> surface Water level measurements were collected from each well to construct groundwater <br /> elevation contour maps The measurements are summarized in Table 4 below A groundwater <br /> elevation contour map for October 30, 1998 is presented as Figure 7 in Appendix 1 <br /> Based on the results of the water level measurements, the groundwater flow direction is north to <br /> northwest, with a gradient of 0 001 As outlined in Table 4, the groundwater elevations <br /> decreased approximately 0 5 feet between September 10 and October 30, 1998 This pattern <br /> follows the typical annual pattern of seasonal groundwater levels where elevations are highest in <br /> the spring and lowest in late fall <br /> ASERVERIIC-DRIVFTROJECTS13272T1ans and Reports\ABF Freight Site Characterization Closure Report doc 11/17/98 <br />