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Ci <br />r <br />LI <br />0 <br />11 <br />11 <br />G <br />n <br />r� <br />Ci <br />a a <br />1W MW k'q KLEINFELDER <br />A-2.7 Decontamination of Equipment <br />To reduce the potential for cross -contamination, augers and associated equipment are steam <br />cleaned prior to drilling each boring. In addition, sampling equipment is cleaned with a <br />trisodium phosphate or non -phosphate detergent wash and rinsed with distilled water prior to <br />collecting each soil sample. <br />A-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-allon 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 />A-3 GROUNDWATER WELL INSTALLATION <br />A-3.1 Monitoring Well Construction <br />Construction details for shallow 1-11-oundwater monitoring wells are as follows: <br />• The well casinL, are 2- ur 4 -inch inside diameter, flush threaded joint, schedule 40 PVC <br />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 -enerally screened from 5 feet above to 15 feet below first groundwater. <br />The screen length is reduced if an aquitard with a minimum thickness of 5 feet is <br />encountered. If an apparent aquitard is encountered, the well is usually terminated 1 to 2 <br />feet into the aquitard. I'I'I'ort is made not to screen across two aquifers. If confined <br />aquifer conditions or hi��h vadose zone contamination are encountered, the well screen is <br />usually not set above the depth of first encountered groundwater. Wells are usually not <br />set in areas of suspected signiiicant soil contamination. <br />20-3978-03.1'36/2019766 <br />© 1999_ Kleinfelder. Inc <br />Page A-4 <br />September 9, 1999 <br />