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V� <br /> I.H. KLEINFELDER&ASSOCIATES <br /> ; <br /> GR0'3:YA VA— ,SsFssmwr <br /> 4.1 MONITORING VELLS—LOCATIONS AND INSTALLATION PROCEDURES <br /> monitoring wells were <br /> constructed in three of the soil <br /> Ground water mo g <br /> B-F0, B-12, and B-13 `Plate 2?• These three borings were chosen <br /> borings: <br /> because high concentrations of petroleum hydrocarbons were not encountered <br /> i <br /> mizi <br /> n <br /> the danger of introducing <br /> at these locations, thereby <br /> min g <br /> round water d�'si.ng Well installation. <br /> contamination into the underlying g 36-37 feet belTW the <br /> * Ground water was first encountered approximately <br /> I <br /> E ground surface in these three borings. i <br /> 1:.� <br /> The ground water monitoring wells were completed with 2-inch inside <br /> diameter, threaded joint PVC pipe: with well sereen'sectiars perforated by <br /> E Fifteen-foot screened sections were set at <br /> 0.020-inch pre-cut slots. <br /> Ewa <br /> depths of,.�about 32 to 47 feet below the ground surface. The annular space <br /> pp � between. the pipe and the wall of the boring was barfilled with X2/12 <br /> k <br /> Monterey sand to ' about 31 feat below ground surface. A 3-foot bentonite <br /> F% <br /> pack to provide a seal against surfaze <br /> 'plug was placed above the sand <br /> annular space was filled with <br /> water in£:ltraticry <br /> The remaining <br /> cement/bentonite grout to the surface. Each well was secured with a <br /> locking well cap and placed inside a Chr?sty box. Construction details of <br /> each w� l are shown on the logs, klatas r} through 26. <br /> E� <br /> A11 three monitoring wells were developed aster installation. Each well <br /> was first sampled with a clear acrylic bailer to visually inspect the <br /> product layer or sheen was <br /> sample for a product layer or sheen.` As no <br /> the wells were developed wit'sa a surge <br /> observed an the water samples, <br /> black/air lift development tool. Surging along the screened interval of <br /> ,.. <br /> the wall was done in order to draw the fine sediment out of the formation <br /> --into-the.._Well,_.and- to set the sand pack. The sediment-laden water was <br /> ---- ----- - - - - — ------- - - <br /> f ` air lifted from tha well at a rate of approximately 0.''S gallons pe <br /> 0 <br /> 9 <br /> 38-87-43 <br />