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File No. 20-3978-01.W 12 k,■ K L E I N F E L D E R January 14, 1997 B-2.5 Collection of BAT Probe Groundwater Samples One-time groundwater samples are collected using a BAT Probe, which is an insitu groundwater sampling device. The borings are first advanced to a point immediately above the desired sampling depth where groundwater is encountered. A stainless steel drive tip equipped with a stainless steel filter is lowered into the boring at the end of a 2.5-inch diameter galvanized steel pipe and pushed using the drill rig approximately 6 to 12 inches into the soil/aquifer formation at the bottom of the boring. A sterilized, glass, vacuum sealed sampling ampoule (tube), similar to a standard volatile organics (VOA) vial, is then lowered through the pipe down to the tip with a cable. Between the tip and the sample tube is a double-sided hypodermic needle (syringe), which simultaneously punctures the seals on the stainless steel drive tip and the septum of the glass sample ampoule. The vacuum in the sample ampoule draws groundwater through the tip into the glass ampoule. The glass ampoule is then pulled out of the pipe, disengaging the syringe. The septum in the glass ampoule and drive tip reseals after the syringe is removed. To reduce the potential for introducing contaminants into the samples, the drive tip, galvanized pipe, and other equipment used for sample collection are steam cleaned and/or washed with trisodium phosphate or non-phosphate detergent solution and double rinsed with distilled water prior to use. The sample probe and filters are cleaned in TSP solution and rinsed with methyl alcohol followed by a distilled water rinse prior to use. New, factory-sterilized syringe needles, O-rings, septum's and sample tubes are used for each sample. B-2.6 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, the sample matrix (soil or water) 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. 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. 20-3978-01.W121207PE024 Page B-3 0!997,Kleinfelder,Inc.