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' KLEINFEIDER <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 /> B4.0 COLLECTION HYDROPUNCH Ih 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 /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> 20-1129-30/2017831-4 Page B-6 <br /> © 1997, Klernf#-ldLr lnL July 14, 1997 <br /> i <br />