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k' ■ K L E I N F E L D E R <br /> A-4.0 COLLECTION HYDROPUNCH II® GROUNDWATER SAMPLES <br /> One-time groundwater samples are collected using a Hydropunch II®, which is an in situ <br /> groundwater sampling device. The borings will be advanced to a depth equivalent to the bottom of <br /> the capillary fringe. A stainless steel drive tip equipped with a filter is lowered into the borings at <br /> the end of a 2.5-inch diameter galvanized steel pipe and pushed using the drill rig approximately 3 <br /> to 5 feet into the soil/aquifer formation at the bottom of the boring. A thoroughly decontaminated <br /> bailer can then be lowered down the center of the Hydropunch II® <br /> casing to obtain a sample of groundwater(which has entered the Hydropunch II® due to hydrostatic <br /> pressure). <br /> To reduce the potential of introducing contaminants into the samples, the drive tip, galvanized pipe, <br /> and other equipment used for sample collection are steam cleaned and/or washed with trisodium <br /> phosphate (TSP) solution and rinsed with distilled water prior to use. The sample tips and filters <br /> are not retrievable. New 0-rings,tips, and screens are used for each sample. <br /> 20-4202-0I.P02/2418R669 Page A-6 <br /> Copyright 1998,Kleinfelder,Inc. October 28, 1998 <br />