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P <br /> Y <br /> 4 <br /> KLEINFELQFR <br /> o Based on the observed geologic conditions, the wells were screened with 2-inch <br /> inside diameter, flush threaded joint, schedule 40, ASTM F-480 PVC pipe with <br /> 0.020-inch factory-cut slots. <br /> o In general, the wells were screened from 5 feet above to 15 feet below first <br /> encountered ground water. <br /> o The annular space between the screen and the wall of the boring was backfilled <br /> with clean 2112 Lonestar Industries Montemy sand to approximately 2 feet <br /> above the slotted sections. The annular space above the 2112 sand was then <br /> filled an additional foot with clean 0130 Lonestar Industries sand. This was <br /> done to prevent bentonite pellets from leaching into the slotted screen, The <br /> screen and sand filter pack size were selected in the field based on the geologic <br /> conditions encountered in each boring. <br /> o A 3-foot bentonite plug was placed above the sand pack to provide a seal against . . <br /> W <br /> cement/bentonite grout infiltration. t <br /> o The remaining annular space was filled with cement/bentonite grout to the <br /> surface. The grout was inplaced under pressure through 1.25-inch diameter <br /> +� tremmie pipe. <br /> 4 - <br /> o Each well was secured inside a locking well cover. <br /> r— <br /> b.l <br /> WATER.LEVEL MEASUREMENTS <br /> Water level measurements were made in threw monitoring wells located at the site. <br /> Measurement protocol was as follows: <br /> w1. The water level probe was decontaminated in a trisodium phosphate waste, j <br /> .... followed by a distilled water rinse, prior to use in each well. <br /> Z. Water level measurements were made using a conductivity based water 'level <br /> indicator. Depth-to-water was measured from the north rim of the PVC well <br /> casing to the n4mrest 0.01 foot. <br /> 3 <br /> r <br /> F18-91-62 <br /> Copyright 3491 Kleinfelder, Inc. ' <br />