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' B-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 /> B-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 based grout material 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 PVC <br /> ' pipe. <br /> The wells are constructed in 6- or 8-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 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. Effort is made not to screen across two aquifers. If confined <br /> aquifer conditions or high 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 significant soil contamination. <br /> • The PVC pipe and end caps are steam cleaned prior to installation. <br /> ' 12406/2002R160 Page B-4 <br /> Copyright 2002,Kleinfelder,Inc. February 20,2002 <br /> KLEINFELDER 2825 East Myrtle Street,Stockton, CA 95205-4794 (209)948-1345 (209)948-0621 fax <br />