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t i 4 <br />' 07 December 2004 <br /> . AGE-NC Project No 98-0448 <br /> Page 6 of 9 <br /> s <br />' 4 2 LABORATORY RESULTS OF GROUND WATER SAMPLES <br /> During the September 2004 monitoring events,TPH-g was detected in five water samples collected <br />' from wells MW-1, MW-2, MW-4A, MW-4B and MW-6� at concentrations as high as ' <br /> 8,100 micrograms per liter(µg/1) The inferred extent of dissolved TPH-g during the September 2004 <br /> ground water monitoring event is depicted in plan view in Figure 4 <br />' Various BTEX compounds were detected in the same water samples at concentrations as high as 17 <br /> µg/1 toluene, 180 µg/1 ethylbenzene and 1,380 µg/1 xylenes from well MW-2, benzene was not <br />' detected in any water samples <br /> No other fuel components were detected by laboratory analysis Previous and current analytical <br />' results of ground water monitoring well samples are summarized in Tables 3 and 4 The laboratory <br /> reports (Cal Tech Environmental Laboratories I D 0409-036), quality assurance/quality control <br /> (QA/QC)and chain of custody forms are presented in Appendix C,GeoTracker confirmation pages <br />' of the submitted laboratory electronic deliverable format(EDF) files are included in Appendix G <br />' 43 RESULTS OF VAPOR EXTRACTION <br /> Between 22 June 2004 and 23 September 2004, the SVE and IAS remediation systems were <br /> operational for a total of 1,800 hours(75 days),the SVE and IAS systems have totaled 28,024 hours <br /> of operation since initiation on 16 April 2001 (Table 7) During the above operational period, SVE <br /> I inlet flow rates were recorded at between 10 and 25 cubic feet per minute (cfm), differential ' <br /> pressures were recorded between 0 10 and 0 25 inches of water,and induced vacuum measurements <br /> ranged between 70 and 78 inches of water Utilizing a photo ionization meter (PID), SVE inlet <br /> I hydrocarbon concentrations were measured between 0 and 145 parts per million (ppm) Field <br /> measurements are summarized in Table 7 <br /> I44 ANALYTICAL RESULTS OF SOIL-GAS VAPOR SAMPLES <br />' During the third quarter 2004, SVE air flow samples were collected on 22 July, on 31 August and <br /> on 23 September 2004 TPH-g was detected between 220 µg/1 and 550 µg/1 from all three of the <br /> above influent SVE air flow samples <br /> Toluene eth lbenzene and xylene compounds were detected in the August 2004 influent SVE air <br /> flow samples at concentrations of 15 µg/1, 3 7 µg11 and 11 µg/1, respectively <br /> Advanced GeoEnvironmental,Inc <br />