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e <br /> n <br /> ' f <br /> %. <br /> Problem Assessment Report 9 <br /> 198 <br /> L?ecerTiber 5, <br /> �-1 USA Petroleum Station No, 65, Lodi, California ACS 87050-3 198 <br /> i <br /> deposit to the southeast. A sand deposit is also present in well AlW-5 from <br /> approximately 35 to 55 feet below grade. The sand layer thins to (lie northwest. <br /> HYUROGEOLOGY <br /> d 111. <br /> �pu ra countered pproxxrtteitl sfe [b ?s FJW T <br /> fi <br /> aPf?rpx tTiey3$� 1f €s�wells pa � ie Log cf Borings indicates a <br /> clay layer is present at both depths. Ground water was stabilized at approximately 42 <br /> feet below grade in MW-1 through MW-3 in a silt layer which lies over a sand layer. <br /> f <br /> Groundwater also was encountered in a sand deposit and stabilized in a silt or clay <br /> layer in borings B-d though $•7 suggesting a confined aquifer. In borings B-4 and B-5, <br /> ground water was encountered during drilling at approximately 44 feet below grade at <br /> the top of the sand unit and equilibrated a few feet above the sand in a clay layer <br /> suggesting ground water is confined. <br /> In boring B-b, ground water was encountered at a <br /> ' ppraximatciy 48 feet below grade in a <br /> ----- -clay layer-mixed-with--fine-grained sand and silt and equilibratEd at approximately 4 feet <br /> above the sand in a clay layer{Plate P-10). r . <br /> , > �t[son • oyer-tnaX {re; <br /> r p : <br /> ^ eri>fttt►eerfl�a'sain' (e �ntarvnts grid that;tla act�ier anfrned.or illsr is <br /> _ 1 <br /> 29 <br /> •4i0, Aeo` Geo gystems <br /> x <br /> rr <br />