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LK DER <br /> 061h,�BH9htProPk.F19ht5olwau. <br /> Survey accuracy is 0.1 foot for the "x" and "y" coordinates and .01 foot for the "z" <br /> coordinate. The depth to static ground water is measured from a set location at the top <br /> of the PVC casing. The depth of water is then subtracted from the elevation of the top <br /> of the well casing to provide a ground water elevation for each monitoring well location. <br /> A-4. COLLECTION HYDROPUNCH lie 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 <br /> bottom of the capillary fringe. A stainless steel drive tip equipped with a filter is lowered <br /> into the borings at the end of a 2.5-inch diameter galvanized steel pipe and pushed <br /> using the drill rig approximately 3 to 5 feet into the soil/aquifer formation at the bottom <br /> of the boring. A thoroughly decontaminated bailer can then be lowered down the center <br /> of the Hydropunch ll°casing to obtain a sample of groundwater (which has entered the <br /> Hydropunch ll® due to hydrostatic pressure). <br /> To reduce the potential of introducing contaminants into the samples, the drive tip, <br /> galvanized pipe, and other equipment used for sample collection are steam cleaned <br /> and/or washed with Liquinox® (laboratory grade detergent) solution and rinsed with <br /> distilled water prior to use. The sample tips and filters are not retrievable. New 0-rings, <br /> tips, and screens are used for each sample. <br /> 1 <br /> r <br /> 101486.4/ST011 R242 Page A-7 October 31, 2011 <br /> Copyright 2011 Kleinfelder <br />