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y : <br /> December 4, 1989 <br /> Work Plan Evaluation of Soil and Ground Water AGS 38032-3W <br /> Unocal Station No. 6981, Stockton, California <br /> water samples will be analyzed for nitrate-N using EPA !Method 353.1, and <br /> nd <br /> total and fecal coliformcolifom anayses are required by <br /> . The <br /> blictH Health Services whetrate a n!monitoring wells are � <br /> the San Joaquin County <br /> ._, constructed within.50 feet of sanitary sewer lines. <br /> o Contract th.e •,tutees of a licensed land surveyor to survey the elevation and <br /> location of the wells. <br /> �.� o Evaluate the groundwater gradient and flow direction beneath the site. <br /> o Interpret field and laboratory data to evaluate whether additional work is <br /> warranted. Discuss the data evaluati,.n with Unocal. <br /> r Recommend additional work,if necessary,to delineate soil and ground-water <br /> contamination at the site. <br /> o ':epare a Problem Assessment Report summarizing our findings,conclusions, <br /> and recommendations. Preparation of this report will be deferred until soil <br /> and groi ndwater contamination are delineated. <br /> 4K7 <br /> A proposed monitoring well, previ.ousiv proposed it be constructed in the surface casing <br /> between the two existing underground storage tanks,will not be constructed in this location <br /> during this phase of work. The location of the five monitoring walls are shown on Plate <br /> P-2, Wmonitoring wells using the results of the laboratory <br /> e selected the locations for the <br /> analyses of snit sampies (Applied GeoSystems Report No. 38!}32-1, dated July 8, 1988}, to <br /> evaluate the ground water beneath the site downgradient and upgradient of the soil <br /> during cur previous investigation. The soil-vapor survey <br /> contamination encountered <br /> ti suggested that hydrocarbon contamination was not present offs'ste. <br /> 13 <br /> ,4,xap/��� +Ge®5yStefr�s <br /> F . <br />