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KL E I N F E L D E R <br /> k- <br /> ilo <br /> 8-2.7 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/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 point, schedule 40 PVC <br /> pipe <br /> 0 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 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 /> • The annular space between the screen and the wall of the boring is backfilled with the <br /> appropriate clean sand to approximately 2 feet above the top of the perforated sections <br /> Based on soil logs or a sieve test, modifications may be made regarding the size of sand <br /> 20-1311-40 E01/2019R039 Page B-4 <br /> ©1999,Kleinfelder, Inc January 20, 1999 <br /> 1 <br />