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File No. 20-3978-0LP02 K L E IN FELD E R November 5, 1996 B-2.7 Decontamination of Equipment To reduce the potential for cross-contamination, augers and associated equipment are steam cleaned prior to drilling each boring. In addition, sampling equipment is cleaned with a trisodium phosphate or non-phosphate detergent wash and rinsed with distilled water prior to collecting each soil sample. B-2.8 Soil Boring Closure and Cutting Disposal Soil borings are closed immediately after the collection and logging of soil samples. Closure is accomplished by grouting the boring with a cement(bentonite slung or as otherwise required. Drill cuttings will be placed in 55-gallon drums wrapped in plastic or spread around the boring and left on site for disposal by the site owner. If requested, Kleinfelder can coordinate disposal of soil and water after analytical results are available. B-3 GROUNDWATER WELL INSTALLATION B-3.1 Monitoring Well Construction Construction details for shallow groundwater monitoring wells are as follows: • The well casing are 2- or 4-inch inside diameter, flush threaded joint, schedule 40 PVC pipe. • The wells are constructed in 8- or 10-inch diameter borings. • Well screen sections are perforated with 0.010- or 0.020-inch factory-cut slots. • The wells are generally screened from 5 feet above to 15 feet below first groundwater. The screen length is reduced if an aquitard with a minimum thickness of 5 feet is encountered. If an apparent aquitard is encountered, the well is usually terminated 1 to 2 feet into the aquitard. Effort is made not to screen across two aquifers. If confined aquifer conditions or high vadose zone contamination are encountered, the well screen is usually not set above the depth of first encountered groundwater. Wells are usually not set in areas of suspected significant soil contamination. • The PVC pipe and end caps are steam cleaned prior to installation. 20-3978-01.P02IMP960129 Page B-4 01996, Kleinfelder, Inc.