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I _ <br /> O1 December 2004 , <br /> AGE-NC Project No 97-0333 <br /> Page 6 of 11 <br /> 3 4 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> Each ground water sample was logged on a chain of custody form,placed in a chilled container and <br /> ' transported to Castle Analytical Laboratory, a DHS-certified laboratory for analysis for <br /> • TPH-g by EPA Methods 5030/8015M, <br /> ' • BTEX and MTBE by EPA Method 8020, and <br /> • Volatile organic compounds,including PCE,TCE, 1,2-DCA, EDB,MTBE,TAME, DIPE, <br /> ' ETBE and TBA by EPA Method 5030/8260 <br /> 35 QUARTERLY GROUND WATER MONITORING RESULTS <br /> ' Ground water elevation, flow direction and gradient were determined from field data collected on <br /> 22 June 2004, the contaminant impact to ground water was quantified by laboratory analysis of <br /> ground water samples collected on 22 and 23 June 2004 <br /> 1 <br /> 3 5 1 Ground Water Elevation and Gradient <br /> ' Depths to ground water were measured between 22 45 feet(MW-5)and 28 23 feet(MW-7D)below <br /> the tops of the well casings on 22 June 2004,ground water elevations were calculated to be between <br /> 1 4 57 feet (MW-11B & MW-11F) and 9 75 feet (MW-6) above mean sea level (MSL) Based on <br /> current and previous monitoring data collected from wells MW-1 through MW-13, ground water <br /> elevation at the site generally decreased an average 4 37 feet between the March 2004 and the June <br /> ' 2004 ground water monitoring events <br /> Ground water elevation data collected from multi-level wells MW-I1, MW-12 and MW-13 on 22 <br /> ' June 2004 is depicted on cross section F-F' (Figure 3) The vertical gradients between adjacent <br /> screen intervals are depicted on cross section F-F', the vertical gradient was calculated by <br /> ' determining the difference between adjacent screen interval ground water elevations (dh) and <br /> dividing by the difference of the screen interval midpoints(dl) Generally, a pronounced downward <br /> gradient was observed between the First Zone and the upper Second Zone at all three well locations, <br /> near neutral gradients were observed at all other locations <br /> 1 ' <br /> The 22 June 2004 ground water elevation data collected from the Rainwater Car Wash site was <br /> ' plotted for the informal First Zone, Second Zone, Third Zone and Primary Aquifer Zone <br /> hydrogeologic flow units, and are depicted on Figures 4 through 7 <br /> 1 Advanced GeoEnviroamental,Inc <br /> 1 <br />