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7-11/Stockton 11 <br /> June 1989 <br /> The initial baring in each well cluster will be drilled <br /> with the hollow-stem auger system previously described. <br /> It will be drilled to approximately 70-feet, which is <br /> the anticipated aquitard depth, as established in <br /> previous investigations. Continuous cores will be <br /> collected from the initial boring which will be <br /> examined to determine completion depths for each well <br /> of the cluster. To maintain sample integrity during <br /> drilling, samples for laboratory analyses will be <br /> collected at 5-foot intervals with a split-spoon <br /> sampler to be field screened for volatile hydrocarbon <br /> concentrations using a portable PTD. Samples will be <br /> collected in 2-inch-diameter by 6-inch-long brass <br /> sample tubes. Sample tubes will be wrapped in aluminum <br /> foil, capped, taped, labeled, and stored on ice for <br /> _ delivery to the analytical laboratory (see SOP 8) . At <br /> - least four of these samples will be submitted to the <br /> laboratory for analyses of BTEX and TPH-as-gasoline. <br /> They will include the following: (1) one for the first <br /> evidence of contamination (PID reading) ; (2) one from <br /> the top water table; (3) the one which exhibits the <br /> highest PID reading; (4) and the last one which shows a <br /> PID reading as the hole is drilled. <br /> A shallow well will be installed in the initial boring <br /> to a depth of approximately 15-feet below the water <br /> table to monitor the upper saturated zone. <br /> Subsequently, two additional wells will be constructed <br /> to complete a total of three wells within the cluster. <br /> The screened intervals for the two deeper borings will <br /> '- be approximately 5 feet in length and will be staggered <br /> �� Gkr�l'SE�II':1TF:K <br /> TF.i w%ouio.INC. <br />