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30 August 2001
<br /> i AGE-NC Protect No 95-0130
<br /> Page 3 of 5
<br /> feet below the tops of well casings, ground water elevations were calculated to be between 20 63 feet
<br /> and 2123 feet below mean sea level Ground water elevation at the site increased an average
<br /> 0 67 feet between the February 2001 and the May 2001 ground water monitoring events The ground
<br /> water elevation data for MW-1 through MW-5 during the May 2001 ground water monitoring event
<br /> is depicted in Figure 3 In addition, data from the previous monitoring event for monitoring wells
<br /> MW-4 and MW-5 was transposed on the ground water level contour map, a revised map for the first
<br /> Iquarter is presented in Figure 4
<br /> Ground water flow direction in the area bound by wells MW-1, MW-3 and MW-5 was inferred to
<br /> I be toward the northeast at a gradient of 0 006 ft/ft or less (Figure 3) Ground water flow direction
<br /> In the area bound by wells MW-1, MW-2,MW-3 and MW-4 was inferred to be towards the east at
<br /> a gradient of 0 005 ft/ft or less
<br /> 3 2 LABORATORY RESULTS OF MONITORING WELL GROUND WATER SAMPLES
<br /> A total of eleven ground water samples were submitted to a DHS-certlf ed laboratory for analysis
<br /> • BTEX compounds were detected in water samples collected from wells MW-1, MW-2, MW-3,
<br /> MW-4, MW-5, VW-113, VW-1C, VW-2A, VW-2B, VW-3A and VW-3B at concentrations as high
<br /> as 45,000 micrograms per liter(ug/l) (toluene, VW-IC) The greatest benzene-impact was detected
<br /> in ground water sample collected from well VW-1C at a concentration of 37,000 ug/l The greatest
<br /> ethyl benzene-impact was detected In ground water sample collected from well VW-IC at a
<br /> concentration of 3,700 ug/I The greatest total xylene impact was detected in ground water samples
<br /> Icollected from wells VW-1B and VW-1 C at a concentration of 18,000 ug/1
<br /> TPH-g was detected in water samples collected from wells MW-1, MW-2, MW-3, MW-4, MW-5,
<br /> I VW-1B, VW-1C, VW-2A, VW-213, VW-3A and VW-3B at concentrations as high as 240,000 ug/l
<br /> (TPH-g, VW-3B), the laboratory reported each TPH-g chromatogram as having unmodified or
<br /> weakly modified gasoline patterns
<br /> MTBE was detected in ground water samples collected from wells MW-1,MW-2, MW-3, VW-IB,
<br /> VW-1C, VW-2A, VW-2B, VW-3A and VW-3B at concentrations as high as 280,000 ug/1
<br /> I (MTBE, VW-3B) TAME was detected In groundwater sample collected from wells sample MW-1
<br /> at a concentration of 6 8 ug/l TBA was detected in ground water samples collected from wells MW-
<br /> 5 and VW-2A at concentrations as high as 190 ug/l There were no reported detections of fuel
<br /> oxygenating compounds In any other ground water samples analyzed
<br /> 1,2-DCA was detected In ground water samples collected from wells MW-2, MW-3, VW-1B,
<br /> VW-1C, VW-2A, VW-213, and VW-3A at concentrations as high as 220 ug/1 (VW-1C) EDB was
<br /> detected in ground water samples collected from wells VW-1B and VW-IC at concentrations as high
<br /> as 150 ug/1 (VW-1B) There were no reported detections of 1,2-DCA or EDB in any other ground
<br /> Advanced GeoEnvirvnmental,Inc
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