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i, gat " <br /> KlEINFEL[-iER <br /> Proposed construction detai:s for the ground water monitoring wells are as follows: <br /> o The wells will be construrted in 8-inch boreholes. <br /> o Th-2 well casing will be 2-incl+ inside diameter, flush-threaded joint,s&-dupe <br /> F� 40 PVC pipe. <br /> o The screened section may be set 1 to 5 feet above and 10 to 20 feet beloh the <br /> a deptn where ground water is first encountered unless: <br /> 1. Semi-confined or confined aquifer conditions are encountered. <br /> i; <br /> 2. High petroleuin hydrocarbon concentrations are indicated in the <br /> i1.= ground water. <br /> 3. Ari.aquitard is encounttred. <br /> 3 <br /> If any of the above wrid;vcrs are present, the screen section depth and <br /> length may be revised. <br /> o The PVC pipe will be ste9un-cleaned prior to installation. <br /> I� <br /> Well screen sectio:is will be perforated with 4.010 or O.020-inch factory-cut <br /> slots. The decision will be made out in the field based on geological <br /> conditions. <br /> i o The annular space between the pipe and the wall of the boring will be <br /> backfilled with the appropriate clean Lone Star Industries Monterey sand to <br /> approximately 1 to 2 feet above the top of the perforated section. <br /> a A 3-foot bentonite plug will be placed above the sand pack to provide a seal <br /> against surface water infiltration. <br /> o The remainR,-:g annular space will be filled with cem—untobentonite brout to <br /> the surface. <br /> o Each well will be secured inside a lacking well cover. <br /> 3.4 MONITORING WELL DEVELOPMENT AND SAMPLING <br /> k� 148-88-2109 5 <br />