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0 • <br /> from the ground surface to a depth of approximately 1,000 feet, and <br /> consist predominantly of clay,silt, and fine-grained sand. <br /> The lithology beneath the Site was characterized during the Phase I <br /> Environmental Site Assessment (ESA). The soil from the surface to <br /> approximately 7 feet below ground surface (bgs) consisted of very fine- <br /> grained silt/sandy silt. From approximately 7 to 12 feet bgs,inorganic <br /> clay with little to no sand or silt was encountered. The shallow water- <br /> bearing zone,which occurs between approximately 4 to 7 feet bgs beneath <br /> the Site,is contained within a laterally discontinuous, fine-grained <br /> silt/sandy silt unit. The inorganic clay unit appears to be dry. <br /> During the most recent (2006) investigation drilling activities, soil from the <br /> surface to between approximately 4 to 7 feet bgs consisted of poorly <br /> graded,fine-to medium-grained sand. A laterally discontinuous layer of <br /> silty sand was noted from approximately 5 to 8 feet bgs in five of the 12 <br /> borings. In all 12 borings,a layer of silty clay was logged below the sand <br /> or silty sand layer down to approximately 12 feet bgs. Groundwater was <br /> logged in all boreholes at depths ranging from 6 to 7 feet bgs. <br /> Depth to water measurements during the Phase II ESA indicated that <br /> groundwater elevations in temporary wells SB-4 through SB-7 ranged <br /> from-0.47 to 0.79 feet above mean sea level (msl) on 12 January 2005. The <br /> direction of groundwater flow measured during the most recent <br /> investigation was generally to the south and was likely influenced by <br /> seasonal variability and rainfall. The groundwater gradient is estimated <br /> to be between 0.0115 and 0.0156 feet per foot. <br /> pW1 3 UTE O,INC./006737.01-N..ba 2007 <br />