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' 5. 0 GROUNDWATER SAMPLING <br />' Groundwater samples were collected on June 5 , 2000 Depth-to- <br /> groundwater was measured using an electric water level meter <br /> prior to groundwater sampling activities Groundwater sampling <br /> involved bailing approximately three to five well casing volumes <br />' of water out of the wells prior to sampling Parameters such as <br /> water clarity, pH, temperature, specific conductance, and volume <br /> extracted were measured during purging (Table 3 ) The wells were <br />' bailed near--continuously until all stagnant water was removed <br /> Groundwater samples were collected manually (hand-bailed) using a <br /> Teflon bailer from each monitoring well The samples were <br /> transferred into 40-m1 VOA vials and 1-liter amber-colored glass <br /> bottles with a Teflon septa The samples were stored in a <br /> chilled cooler containing crushed ice to maintain the sample at <br /> 4°C for delivery to the laboratory Strict chain-of-custody <br /> protocols were followed in all phases of sample handling <br />' All equipment used during the sampling activities which came in <br /> contact with contaminated material were thoroughly decontaminated <br /> before and after each use This was accomplished by washing with <br /> Alconox (a laboratory-grade detergent) and rinsing with distilled <br /> water <br />' 6. 0 GROUNDWATER ELEVATION AND FLOW <br /> The elevation of the groundwater surface (potentiometric surface) <br />' was measured for each monitoring well to evaluate the direction <br /> of groundwater flow at the Site Groundwater level measurements <br /> were recorded using an electronic water-level probe attached to <br /> an engineer ' s measuring tape graduated to 0 01-foot intervals <br />' Measurements were recorded from the top of the groundwater <br /> surface to the top of the well casing The difference between <br />' the top of the well casing elevation and the depth to the top of <br /> the groundwater surface is a measurement of the potentiometric <br /> surface of the groundwater table <br />' Measured depth to groundwater levels at the Site ranged from <br /> -3 . 23 feet (MW-2 ) to -3 38 feet (MW-3 ) above mean sea level <br /> Mapping and analysis of the groundwater elevation data suggest <br />' that the local groundwater gradient flows in a northeasterly <br /> direction The top of well casing elevations, depth-to-- <br /> groundwater, and the computed elevation of the groundwater <br />' surface is listed in Table 2 Figure 4 shows the water-level <br /> data collected and interpreted contour lines <br />' 3 <br />