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.I <br /> KLEINFELDER <br /> i. <br /> A-4.0 COLLECTION HYDROPUNCH II GROUNDWATER SAMPLES <br /> d <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 <br />` Y of the capillary fringe. A stainless steel drive tip equipped with a filter is lowered into the <br /> borings at the end of a 2.5-inch diameter galvanized steel pipe and pushed using the drill rig <br /> approximately 3 to 5 feet into the solVaquifer formational at the bottom of the boring. A <br /> thoroughly decontaminated 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 Ho due to <br /> hydrostatic pressure). <br /> i <br /> To reduce the potential of introducing contaminants into the samples, the drive tip, galvanized <br /> pipe, and other equipment used for sample collection are steam cleaned and/or washed with <br /> trisodium phosphate (TSP) solution and rinsed with distilled water prior to use. The sample tips <br /> and filters are not retrievable. New O-rings, tips, and screens rare used for each sample. <br /> f <br /> J <br /> f <br /> i <br /> f <br /> !y <br /> :y <br /> :i <br /> { <br /> �E <br /> 1 <br /> 3 <br /> M+ <br /> ii <br /> 20-4659-O1.EOI/201 1 R1442 Page A-6 <br /> ®2001,Kleinfelder, Inc. November 28,2001 <br />