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IME <br /> , s <br /> PRE4fMINAR.Y HYDROGEOLOG[C ASSBSSMENT WORE{PLAN <br /> 6491"F"Street,Banta,California <br /> Delta Project No.40-BB-481 <br /> Pate 10 <br /> 2.5 Utilities <br /> With the exception of electricity there are no city utilities located at the site. A septic tank is located <br /> as shown on Figure 2. <br /> 2.6 Spill History <br /> From the information provided, there has been no documented release of petroleum hydrocarbons <br /> at the site. The three gasoline-holding USTs were epoxy lined three years ago. At that time there <br /> was no indication of holes in any of the tanks. <br /> Q BACKGROLIND INFOBMATION <br /> 3.1 Re ional Gealaev <br /> Banta, California, is located within the Grest Central Valley Geomorphic Province of Californi?. <br /> The Central Valley Province is bordered to the east by the Sierra Nevada Mountains and to the wesR <br /> by the Coast Ranges. Surficial geology in the Banta area consists primarily of recent alluvium and <br /> the Recent to Pleistocene age Flood Basin Deposits. Both units consist of discontinuous lenses of <br /> gravel,sand,silt,and clay. Recent alluvium deposits typically do not exceed 150 feet in thickness. <br /> Flood Basin Deposits p p approximately one-mile northwest of Banta. Maximum thickness of <br /> Flood Basin Deposits is about 1400 feet. This unit is typically finer-grained than the alluvial depusits <br /> and may also contain appreciable amounts of organic matter. A generalized stratigraphic column of <br /> San Joaquin County is presented in Table 4, <br /> 3.2 5ite Gealggy <br /> Based on information provided by the soil borings drilled by ETS(Section 2.1),subsurface materials <br /> m- at the site consist primarily of clay and silt lenses. Following completion of the activities described <br /> in this work plan, hydrogeologic cross-sections) of the site will be prepared and presented in the <br /> 'Preliminary Hydr, ealogic Assessment Report: <br /> 6d. <br /> 3.3 Ground Wafter Flow <br /> ^-� The direction of ground water flow within the uppermost water-bearing zone at the site has not been <br /> defined at this time. However,because of the proximity of the site to the San Joaquin River,located <br /> about 5 miles east of the site,it is anticipated that the direction of ground water flow is toward the <br /> east r northeast. The direction of ground water flow will be defined following the installation of . <br /> -- ---- --- ------the-ground-water mon itori n wells at the site Section 4 ] and.w1)l lie reported in the Preliminary <br /> Hydrogeologic Assessment Report submitted at the conclusion of the investigation described in this <br /> is <br /> work plan. <br /> 1 <br /> } <br /> 1 <br /> I <br /> 7 <br /> 3n <br />