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September 13, 1991 <br /> Unocal Station No. 6981, Stockton, California ---- <br /> if the proposed monitoring wells are 'onstructed with screened intervals vL-clow a competent analyses <br /> clay layer, a sample of the clay will also be submitted for p y <br /> her clay layers encountered are capable of acting as competent <br /> will be used to evaluate whet <br /> 04 <br /> aquitards. <br /> Soil BorilIgs/vapor-Extraction 1Velis <br /> The four 10-inch-dianieter borings, 13-9 through B-12. will be terminated at approximately <br /> 'These borings will be terminated at 45 feet below surface <br /> 45 feet below surface grade. <br /> eviou <br /> grade to construct vapor-extraction wells that will be aL-ove ground water <br /> ill L r used sto <br /> measured at appY <br /> roxirnatel 50 feet below surface grade. 1-hese boringsw <br /> constt:Ict 4-inch diameter vapor-extraztions wells, The wells will be constructed by a <br /> driller. Boring B-9 will be drilled near boring B-2 and callinletedorth as vapor- <br /> licensed th c <br /> extractian well VW-1; boring B-10 will be drilled near the center of th <br /> tion well VW-2; boring 8-11 will b <br /> dispenser islands and completed as vapor-extracs Vall <br /> Por- <br /> near the northwest corner of tite underground storage tanks and complete a P <br /> -12 will be drilled near boring B-5 and completed as <br /> extraction well VW-3; and boring B <br /> 6 x <br /> vapor-extraction well VW-4- <br /> Iononitorin*ti'ell Construction. Deve'-:inent and SamMling <br /> n the borings with thread-jointed. 2-inch-inner- <br /> Monitoring wells will be construct-:d i <br /> e (PVC) casing. Na chemica <br /> lues, or <br /> diameter, Schedule 40 polyvinyl chloridwmewell v�!! consist of <br /> solvents will be used in vieil construction. The screened portion of each <br /> factory-pe.far2ted casing with 0.020-inch-wide slots_ <br /> 12 <br /> -- 38032-4w <br /> �a <br /> j <br />