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r <br /> 1.5 acres arid is used for warehousing and office space. The site consists of <br /> areas formerly used for dry bulk storage,a liquid tank farm,and a full-bag <br /> storage warehouse (Figure 2). <br /> �1 <br /> 2.3 SITE GEOLOGYAND HYDROGEOLOGY <br /> Based on geologic and hydrogeologic interpretations from past <br /> investigations, the following paragraphs describe the geology and <br /> hydrogeology encountered beneath the site. <br /> The site is situated along the central portion of the physiographic province <br /> commonly referred to as the Great Valley. The Great Valley is a major <br /> California groundwater basin bounded on the east by the Sierra Nevada <br /> and Cascade Ranges and on the west by the northern extension of the <br /> Coast Ranges. The basin extends north to the city of Red Bluff and south <br /> to the city of Bakersfield. This portion of the Great Valley occurs in the <br /> northern part of San Joaquin Valley. fit the Stockton area, the Flood Basin <br /> Deposits occur from the ground surface to a depth of approximately 1,000 <br /> feet. Sediments of the Flood Basin Deposits consist predominantly of clay, <br /> silt and fine-grained sand, with occasional gravel beds along the present <br /> waterways. <br /> The lithology beneath the site was determined during drilling activities. <br /> The soil from the surface to approximately seven feet bgs consisted of very <br /> fine-grained silt/sandy silt. From approximately seven to 12 feet bgs, <br /> inorganic clay with little to no sand or silt was encountered. The shallow <br /> water-bearing zone which occurs between approximately four to seven <br /> feet bgs beneath the site is contained within a laterally discontinuous,fine- <br /> grained silt/sandy silt unit. The inorganic clay unit appeared to be dry. <br /> ,J <br /> I� <br /> 1 enw 4 =O/0024301-3/3/2005 <br /> J <br /> IJ <br />