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Kennedy,/Jenks Consultants <br /> Spectrum performed the drilling activities at the Site on 26 and 27 September 1996, using <br /> ' a hollow stem auger drill ng AEN performed the laboratory analyses on the <br /> reconnaissance groundwater samples collected from the three borings The laboratory <br /> analysis performed on the reconnaissance groundwater samples are also summarized in <br /> ' Table 1 <br /> 2 2 4 Local Hvdrogeoloaly <br /> The lithology of the Site consists primanly of clay, silt and sand In general, lean clay is <br /> present in the upper 17 to 20 feet of the Site This clay is underlain by interbedded silty <br /> sand, sand, and lean clay units Groundwater was encountered during the drilling of <br /> ' Borings SB-8 through SB-10 at depths between approximately 41 feet bgs and 45 feet bgs <br /> Because groundwater monitoring wells have not been installed at the Site, the local <br /> 1 groundwater gradient and flow direction are unknown However, groundwater <br /> investigations conducted at 300 South California Street (approximately 0 09 mile southwest <br /> of the subject property) indicate that the direction of the groundwater gradient is to the <br /> ' north-northeast <br /> 1 <br /> 1 <br /> o yob1961966070 Mphase«Iteztdac 5 <br />