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Mr. Bob Fratto j <br /> .x July 27, 1993 <br /> Page 3 <br /> Water level measurements were taken in each well by lowering an electric probe into the well <br /> casing. Due to the temporary nature of the well casing, water level measurements are reliable <br /> estimates but not precise. The measurements are used to estimate groundwater flow direction <br /> and hydraulic gradient. Table 1 summarizes water level measurements. <br /> Table 1. Water Level Measurements } <br /> Well Relative Depth to Groundwater level <br /> identification elevation,a ft groundwater, ft elevation, ft <br /> TW 1 95.01 76.34 18.67 <br /> # TW2 96.82 78.16 18.66 <br /> TW3 97.09 78.46 18.63 <br /> TW4 96.72 77.26 19.46 <br /> aRelative elevation of 100.00 feet above mean sea level used as reference. <br /> Surveying <br /> Each temporary well was surveyed by transit by BC personnel for relative elevation only. An <br /> arbitrary elevation of 100 feet above mean sea level was used as the reference elevation. <br /> Distances between wells and the survey reference point could not be obtained due to the open ; <br /> excavation separating them. Therefore, distances between borings are estimated based on <br /> field observations. <br /> Groundwater Sampling <br /> After water level measurements were collected and relative elevations were sighted, <br /> groundwater samples were collected from each temporary well.. A disposable bailer was <br /> lowered into the casing to collect the groundwater. The groundwater was immediately <br /> transferred from the bailer to laboratory cleaned containers. All analytical samples were <br /> placed on ice in cool ice chests until delivered to the laboratory. Each groundwater sample <br /> was analyzed for BTEX using EPA Method 602/Purge-and-Trap, TPH as gasoline using EPA <br /> Method Modified 8015/Purge-and-Trap, and TPH as diesel and motor oil using EPA Method <br /> Modified 8015/Extraction. <br /> Well Abandonment <br /> i <br /> After groundwater samples were collected from each temporary well, the PVC casings were <br /> pulled from the boreholes. The borehole was then backfilled to the surface with neat cement, <br /> using tremie hose to ensure complete filling. <br /> Brown and Caldwell <br /> Consultants 76Q3\CORMPS 7603-01.Lr1 <br /> s` <br />