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• M KKLEINFELGER <br /> B-2.8.1 Geoprobe Decontamination <br /> To reduce the potential for cross-contamination, Geoprobe pipe and associated equipment are <br /> steam cleaned prior to advancing each boring. In addition, sampling equipment is cleaned with a <br /> trisodium-phosphate wash and rinsed with distilled water prior to collecting each soil sample. <br /> Groundwater samples will be collected with a decontaminated stainless steel bailer. <br /> B-2.9 Geoprobe Closure <br /> Upon completion of Geoprobe sampling, the borings will be closed by backfilling the borings <br /> with a neat cement grout, or bentonite chips or powder. <br /> B-2.10 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 /> B-3 GROUNDWATER WELL INSTALLATION <br /> B-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 <br /> 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 well <br /> is 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 are encountered, the well screen is usually not set above the depth <br /> of first encountered groundwater. Wells are usually not set in areas of suspected <br /> significant soil contamination. <br /> 20-YP 1-628/2011 P 180 Page B-4 <br /> 0 2001,Kleinfelder,Inc. July 2,2001 <br />