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t � in KLEINFELDER <br /> ' C-2.8 Soil Boring Closure and Cutting Disposal <br /> Soil borings are closed immediately after the collection and logging of soil samples. Closure is <br /> accomplished by grouting the boring with a cement/bentonite slurry or as otherwise required. <br /> ' Drill cuttings will be placed in 55-gallon drums wrapped in plastic or spread around the boring <br /> and left on site for disposal by the site owner. If requested, Kleinfelder can coordinate disposal <br /> ' of soil and water after analytical results are available. <br /> C-3 GROUNDWATER WELL INSTALLATION <br /> 1 C-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 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 groundwater. The <br /> screen length is reduced if an aquitard with a minimum thickness of 5 feet is encountered. If an <br /> apparent aquitard is encountered, the well is usually terminated 1 to 2 feet into the aquitard. <br /> ' Effort is made not to screen across two aquifers. If confined aquifer conditions or high vadose <br /> ' zone contamination are encountered, the well screen is usually not set above the depth of first <br /> encountered groundwater. Wells are usually not set in areas of suspected significant soil <br /> ' 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 with the <br /> appropriate clean sand to approximately 2 feet above the top of the perforated sections. Based on <br /> soil logs or a sieve test, modifications may be made regarding the size of sand to be used. <br /> ' Installation of the sand may require that the sand be tremmied, using clean water. <br /> 20-2594-03.004/2011R447 Page C-4 <br /> Copyright 2001,Kleinfelder, Inc. June 8,2001 <br />