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ASSOCIATES INC <br /> 1 Groundwater analytical results are summarized in Table 2, and laboratory data sheets are <br /> presented in Appendix B <br /> 3,0 SUBSURFACE CON DMONS <br /> 3_1 GeolOiry <br /> The site is situated at an approximate elevation of approximately 43 feet above mean sea level, in <br /> the Great Valley geomorphic province The Great Valley province is a north-south elongated <br /> structural trough filled with sediment from marine and continental sources The continentally <br /> derived sedimentary deposits comprise the upper portion of the valley fill, and were deposited in <br /> Ifluvial, alluvial, and lacustnne environments <br /> The site is situated on level terrain The soils at the property have been mapped by the United States <br /> Department of Agriculture (USDA), Soil Conservation Service as Archerdale Clay Loam This nearly <br /> level map unit is formed in alluvium derived from mixed rock sources A few areas have been noted to <br /> be dissected by interrtuttent sloughs which have since been filled as a result of land leveling The annual <br /> precipitation is about 14 inches(USDA, 1992) <br /> Noteworthy observations include an apparent discontinuous gravel bed observed at approximately <br /> 20 feet bgs in borings GPI, GP2, GP3, CPTI, SBI, MWI, MW2, and MW3 Also, a clay <br /> interval was observed at a depth of approximately 35 feet bgs in bonngs GPI, GP2, GP3, SBI, <br /> SB2, MWI, and MW2 Soil samples indicate the thickness of each of these units is generally less <br /> than five feet (see Figures 4 and 5) <br /> Although sand was logged periodically in the upper 60 feet of the soil column, no sand umts were <br /> observed beyond 65 feet bgs Soils below 60 feet bgs generally consisted of silt and clay <br /> variations <br />' 1.12 Hydrogeologv <br /> 1 During the third and fourth quarters of 2004, depth to water measurements indicated that the <br /> groundwater table was present at levels below the bottoms of the well casings <br /> During the second quarter of 2004, groundwater was present at a depth of approximately 85 feet <br /> bgs Assuming horizontal isotropic conditions, groundwater flow in the uppermost aquifer <br /> beneath the site on April 15, 2004, was to the east-northeast The average hydraulic gradient was <br /> calculated to be 0 001 ft/ft or approximately 5 1 ft/mile Historically, groundwater beneath the <br /> site generally flows in a northeasterly direction <br /> w 1148851reporl 5=2004 doc 5 <br /> i <br />