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VVli'ilVi lRMli F.VaTI F.'AP ""' <br /> KLEINFELDEP <br /> B-2.8.1 Geoprobe Decontaminmion <br /> Tp reduce the potmitial 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 s mTles will be collected with a downtaminated stainless steel bailer. <br /> B-29 Geoprobe Closum <br /> Upon completion of Geoprobe sampling, the borings will be closed by backfilling the boriags r <br /> with afloat cement grout,or bentonite chips or powder. <br /> B,-2,10 Soil Boring Closure and Cutting Disposal <br /> Soil borings are dosed immediately atter the collection and logging of soil samples. Closure is <br /> accomplished by grouting the boring with a cemetntlbentol itc slurry or as otherwise required. <br /> frill cattiangs will be plated 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., Kleeinfelder can coordinate disposal <br /> of soil and mater 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 i 0-inch diameter borings. <br /> * Well screen sections are perforated with 0.410-or 0.02.0-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 encounter, 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 fust encountered groundwater. Wells are usually act set in areas of suspected <br /> significant soil contamination. <br /> * The PVC pipe and end caps are steam cleaned prior to'installation. <br /> 20-YP1-5681251 lP I3 U'2r()I 1035 pzVg.-0 <br /> C.opyrol 2M],K lelMfelder,Inc. May 14,2001 <br />