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'ROW 'Row �� KLEINFELDER A-2 4 Sample Handling After labeling, the sample is immediately stored in an iced cooler for transport to Kleinfelder's office sample control or to the analytical laboratory. A Kleinfelder chain-of-custody form accompanies the cooler. The chain-of-custody form includes Kleinfelder's name, address and telephone number, the employee number of the individual who performed the sampling, the sample numbers, the date and time the samples were collected, the number of containers each sample occupies, and the analyses for which the samples are being submitted, if any The chain-of-custody form is signed by each person who handles the samples, including all Kleinfelder employees and the receiving employee of office sample control or the analytical laboratory when the samples are delivered. A-2 5 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 wash and rinsed with distilled water prior to collecting each soil sample A-2 6 Soil Cutting Disposal Drill cuttings will be placed in 55-gallon drums or wrapped in plastic 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 • A-3 GROUND WATER WELL INSTALLATION A-3.1 Monitoring Well Construction Construction details for shallow ground water monitoring wells are as follows o The well casing will be 2-inch inside diameter, flush threaded,point, schedule 40 PVC pipe o The wells will be constructed in 8-inch diameter borings o Well screen sections will be perforated with 0 010- or 02-inch factory-cut slots o The wells are generally screened from 5 feet above to 15 feet below first ground water. The screen length is reduced if 4n 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 is encountered, the well screen is usually not set above the depth of first encountered ground water. Wells are usually not set in areas of suspected significant soil contamination o The PVC pipe and end caps are steam cleaned prior to installation o The annular space between the screen and the wall of the boring is backfilled • with the appropriate clean Lone Star Industries 0/30 or 2/12 Monterey sand to approximately 2 feet above the top of the perforated sections. Based on soil logs or a sieve test, modifications may be made regarding the size of sand to be