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kn KLEINFELDER <br /> A-2.9 Geoprobe Closure <br /> Upon completion of Geoprobe sampling, the borings will be closed by backfilling the <br /> borings with a neat cement grout, or bentonite chips or powder. <br /> A-2.10 Soil Boring Closure and Cutting Disposal <br /> Soil borings are closed immediately after the collection and logging of soil samples. <br /> ■ Closure is accomplished by grouting the boring with a cement/bentonite slurry or as <br /> otherwise required. <br /> Drill cuttings will be placed in 55-gallon drums wrapped in plastic or spread around the <br /> boring and left on site for disposal by the site owner. If requested, Kleinfelder can <br /> coordinate disposal of soil and water after analytical results are available. <br /> A-3 Groundwater Well Installation <br /> A-3.1 Monitoring Well Construction <br /> Construction details for shallow groundwater monitoring wells are as follows: <br /> The well casing are 2- or 4-inch inside diameter, flush threaded joint, schedule <br /> 40 PVC pipe. <br /> The wells are constructed in 8- or 10-inch diameter borings. <br /> Well screen sections are perforated with 0.010- or 0.020-inch factory-cut slots. <br /> The wells are generally screened from 5 feet above to 15 feet below first <br /> groundwater. The screen length is reduced if an aquitard with a minimum <br /> thickness of 5 feet is encountered. If an apparent aquitard is encountered, the <br /> well is usually terminated 1 to 2 feet into the aquitard. Effort is made not to <br /> screen across two aquifers. If confined aquifer conditions or high vadose zone <br /> contamination are encountered, the well screen is usually not set above the <br /> depth of first encountered groundwater. Wells are usually not set in areas of <br /> suspected significant soil contamination. <br /> The PVC pipe and end caps are steam cleaned prior to installation. <br /> The annular space between the screen and the wall of the boring is backfilled <br /> with the appropriate clean sand to approximately 2 feet above the top of the <br /> perforated sections. Based on soil logs or a sieve test, modifications may be <br /> made regarding the size of sand to be used. Installation of the sand may require <br /> that the sand be tremmied, using clean water. <br /> 1 65078.T2/ST06R506/FB:ly Page <br /> ©2006 Kleinfelder, Inc. May 22,2000606 <br />