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KLEINFELDER <br /> are returned to the site and are combined with the soil cuttings generated during their <br /> collection. <br /> A-2.7 Soil Boring Closure and Soil 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 or wrapped in plastic and left on site for <br /> disposal by the site owner. If requested, Kleinfelder can coordinate disposal of soil and <br /> water with contractors after chemical analysis results are available. <br /> t <br /> A-3 GROUNDWATER MONITORING <br /> V <br /> A-3.1 Monitoring Well Construction <br /> ftp Construction details for shallow ground water monitoring wells are as follows: <br /> • The well casing will be 2-inch inside diameter, flush threaded joint, schedule <br /> 40 PVC pipe. <br /> • The wells will be constructed in 8-inch diameter boreholes. <br /> • Well screen sections are perforated with 0.010- or .020-inch factory-cut slots. <br /> This parameter is assessed (and modified if required) after the boring logs <br /> and, if warranted, a sieve test has been performed and the results received. <br /> s ' <br /> The wells are generally screened from 5 feet above to 20 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 aquitard is encountered the well is <br /> usually terminated 1 to 2 feet into the aquitard. Effort is made not to screen <br /> across two aquifers. If confined aquifer conditions or high vadose zone <br /> contamination is encountered, the well screen is usually not set above the <br /> depth of first encountered ground water. 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 Lone Star Industries 0/30 or 2/12 Monterey sand to <br /> approximately 2 feet above the top of the perforated sections. Based on soil <br /> logs or a sieve test, modifications may be made regarding the size of sand to <br /> be used. Installation of the 0/30 sand may require that the sand be tremmied, <br /> 1� <br /> b" 90163703/ST07R1061 January 3,2008 <br /> 0 2007 Kleinfelder Page A-3 <br />