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— --- -- K _EI NIF E.'B'f^ <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-3.1 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-YP1-611/2011P181 Page B-4 <br />Copyright 2001, Kleinfelder, Inc. July 3, 2001 <br />