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CHEVRON/Stockton <br /> May 1987 <br /> SITE CONDITIONS <br /> RYDROGEO .OGY <br /> The general geology in the Stockton , California vicinity <br /> consists of a thick sequence of river channel and flood plain <br /> deposits. These sequences contain interbedded discontinuous beds <br /> of sand, gravel , silt and clay layers . <br /> The soils underlying the Fremont Street site consist <br /> predominantly of silty clays and sandy clays with minor amounts of <br /> clayey silt . The water bearing unit underlying the site is <br /> composed of silty clay and sandy clay. <br /> Groundwater monitoring conducted on March 23, 1987 indicated <br /> mow- groundwater present at approximately 40 feet below grade at the <br /> a site ( see Table 1 , Groundwater Monitoring Summary) . The well <br /> c� heads were surveyed to an arbitrary reference datum point of 200 <br /> Kit feet . This data was used to obtain a groundwater gradient of <br /> approximately . 4% toward the north ( See Figure 3 , Piezometric <br /> UA Surface Map) . Several water bearing zones reportedly underlie the <br /> site. The shallowest zone occurs at approulmately 40 feet as <br /> recorded in the monitoring wells on site, the deepest zone is more <br /> than 1 ,000 feet deep as reported in the Department of Water <br /> Resources, Bulletin 118. <br /> LIM <br /> - 7 <br />