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kn K L E I N F E L D E R <br /> B-3.5 Well Survey <br /> The locations of soil borings and monitoring wells and the elevation of the top of the PVC <br /> casings is usually surveyed and tied into permanent markers, if readily available. Survey <br /> accuracy is 0.1 foot for the "x" and "y" coordinates and .01 foot for the "z" coordinate. The <br /> depth to static ground water is measured from a set location at the top of the PVC casing. The <br /> depth of water is then subtracted from the elevation of the top of the well casing to provide a <br /> ground water elevation for each monitoring well location. <br /> B-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 <br /> 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 soil/aquifer formation 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 II® due to <br /> hydrostatic pressure). <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 are used for each sample. <br /> 20-3712-08.E01/2018R510 Page B-6 <br /> © 1998, Kleinfelder, Inc. July 9, 1998 <br />