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aM1 - �UM__ <br /> A AAS ` <br /> I <br /> i� <br /> 2. FIELD 1141,1f;STICA'CrON3 <br /> 2.1 HYDROGEOLOGY <br /> The general geology around the Harding Hay site consists of a <br /> thick sequence of river channel and flood plain deposits. These <br /> sequences contain interbedded sand, gravel, silt .and clay layers. <br /> The site overlies an old slough that once ran along the north <br /> side of Harding ;day. Fill beneath the site reaches nine feet in <br /> depth at vapor pipes one and two. A atiff clay underlies the <br /> fill. <br /> Based on a search of the California Department of Water <br /> Resources records, there are seven wells within a half mile <br /> radius of the site (Table 2) . Two of these wells belong to <br /> California Hater Service. One well has a AtArie w r Leval of <br /> 41 feet, but it is agt j u . The other has been permanentl <br /> Closed. =aatMblY because ofpoor production. These wells <br /> showed no indication of infiltration by poor quality Delta water. <br /> Three private wells in the area are used for domestic purposes; <br /> there in no information on the other two wells. <br /> J. Existing monitoring wells 1 and 2, near the tank field at the G <br /> site were drilled to nine Peet. They are both dr wells. No <br /> records of their installation have keen released to EA. <br /> 2.2 SOIL VAPOR CONTAMINMiT ASSESSMENT <br /> The Soil vapor survey, or SVCA, technique takes advantage of the <br /> behavior-af hydrocarbon :sixtureS and the physicoehcrnical proper— <br /> ties of the individual components in the subsurface. following a <br /> subsurface .gasoline release, free product will emigrate downwards <br /> towards the ground mater, Some of the. gasoline will volatilize, <br /> and some will adsorb to the sails. In the case of a spill of <br /> CHV16:81A 2 <br />