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t <br /> s u <br /> May 10, 1987 AGS 86103-2 <br /> ' Cardlock Station #27 - Stockton, California <br /> �r <br /> One soil boring was drilled immediately west of the product <br /> dispensers, a location inferred to be up gradient from the <br /> product storage tank cavity on the basis of information supplied <br /> }. by the San Joaquin Local Health District. MW-1 was installed in <br /> this boring. Two soil borings were drilled immediately to the <br /> east of, and adjacent to, the gasoline storage tank cavity, and <br /> � T were converted into monitoring wells MW-2 and MW-3. Two shallow <br /> y soil borings were drilled immediately adjacent to the faulty <br /> product storage tank in order to sample native soil immediately <br /> below the tank backfill material. <br /> T F <br /> Monitoring well MW-4 was installed on April 10, 1987 in a <br /> location determined to be down-gradient from the tank cavity on <br /> - the basis of data obtained from the previous wells. Locations of <br /> the wells and borings are shown on the Generalized Site Plan. <br /> The equipment used for the borings was a Mobile 8-61 drilling rig <br /> t� <br /> - � operated by Datum Exploration, Inc. , of Pittsburg, California and <br /> ' }Y <br /> equipped with 7 .5 inch and 10 inch diameter hollow stem augers. <br /> The augers were steam--cleaned prior to use and between borings in <br /> order to minimize the possibility of cross-hole contamination. <br /> �s <br /> .i The total depth of drilling was approximately fib feet for borings <br /> , < <br /> B-1 and H-3, 60. 5 feet for boring B-2, and 61 feet for boring <br /> rte.. <br /> �p <br /> 3 - <br /> BQ010994 <br />