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27 February 2003 <br /> AGE-NC Project No 95-0103 <br /> Page 4 of 7 <br /> water flow direction and gradient was determined from the field data collected on 09 January 2003, <br /> the contaminant impact to ground water was assessed from laboratory data <br /> 3 1 GROUND WATER TREATMENT RESULTS <br />' Between 22 August and 27 December 2002, the pump-and-treat system was in operation for <br /> 127 days UtilizingaBlue-W}utelndustries F-2000 flowmeter,the total flow(totalizer)was recorded <br />' between those dates (Table 4) Approximately 809,488 gallons of extracted water was ti eated, for <br /> a total of 1,677,237 gallons of water treated since ground water extraction began on 02 April 2002 <br /> 3 1 1 Laboratory Analysis of Influent and Effluent Ground Water Samples <br />' TPH-g and BTEX compounds were detected in the following influent samples <br /> • TPH-g and BTEX compounds were detected in influentsamples collected on 19 September <br />' . 2002 from wells EW-1, EW-2 and EW-3 at maximum concentrations of <br /> 12,000 micrograms/liter (µg/1) TPH-g, 670 µg11 benzene, 44 gg/l toluene and 1,600 gg/l <br /> xylenes in sample EW-3 and 130 gg/l ethylbenzene in sample MW-2 <br /> TPH-g and BTEX compounds were detected in influent samples collected on 15 October <br /> 2002 from wells EW-1, EW-2, EW-3 and VW-6 at maxirnumcon_entrations of 13,000 gg/l <br /> TPH-g, 180 gg/1 benzene,770 gg/1 ethylbenzene and 1,700 gg/l xylenes in sample VW-6 and <br />' 110 µg/l toluene in sample EW-3 <br /> • TPH-g and BTEX compounds were detected in the influent sample collected on <br />' 25 November 2002 at concentrations of 2,700 gg/l TPH-g, 95 µg/1 benzene, 8 1 µg/l toluene, <br /> 100 gg/1 ethylbenzene and 180 gg/I xylenes <br />' • TPH-g and BTEX compounds were detected in the influent sample collected on 10 December <br /> 2002 at concentrations of 3,600 µg/1 TPH-g, 46 gg/l benzene, 5 Sgg/l toluene, 77 gg/1 <br /> ethylbenzene and 290 µg/1 xylenes <br /> • TPH-d was detected in the influent sample collected on 27 Decembei 2002 at a concentration <br /> of 1,700 gg/l with a laboratory notation that significant gasoline range compounds were <br /> detected within the diesel chromatogram area <br /> TPH-g BTEX compounds and MTBE were not detected in the effluent ground water treatment <br />' samples analyzed, the effluent pH ranged between 7 08 and 7 26 The analytical results are <br /> . summarized in Table 4, laboratory reports are provided in Appendix B <br /> 3 1 2 Mass-Volume Removal Calculations <br /> 1 <br /> Advanced GeoEiumironmental,Inc <br />