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26 February 2004 <br /> AGE-NC Project No 98-0448 <br /> IPage 6 of 10 <br /> I <br /> 52 LABORATORY RESULTS OF GROUND WATER SAMPLES <br /> During both the December 2003 and January 2004 monitoring events, TPH-g was detected in water <br /> samples collected from well MW-2 at concentrations of 12,000 micrograms per liter (µg/1) and <br /> 23,000 µg/l, respectively TPH-g was also detected during the January 2004 monitoring event in <br /> water samples collected from well MW-4(A and B)at concentrations of 2,900 µg/1 and 1,400 µg11, <br /> respectively The inferred extent of dissolved TPH-g during the December 2003 and January 2004 <br /> ground water monitoring events are depicted in plan view in Figures 5 and 6 <br /> During December 2003,BTEX compounds were detected in the water sample collected from MW72 <br /> at concentrations of 420 µg/1 ethylbenzene and 1,800 µg11 xylenes During January 2004, BTEX <br /> compounds were detected in water samples collected from MW-1 at concentrations of 0 69 µg/1 <br /> xylenes,MW-2 at concentrations of 84 µg/1 toluene, 730 µg/1 ethylbenzene and 2,900 µg/1 xylenes, <br /> from MW-4A at concentrations of 2 5 µg/1 ethylbenzene and 35 gg/l xylenes, and from MW-4B at <br /> concentrations of 2 7 µg/1 ethylbenzene and 11 µg/1 xylenes <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 Project Nos 6749 and 6581) and chain-of-custody forms are presented in <br /> Appendices C and D <br /> I53 RESULTS OF VAPOR EXTRACTION <br /> I Between 09 October 2003 and 29 December 2003, the SVE and IAS remediation systems were <br /> continuously operational for 1,944 hours (81 days), the SVE and IAS systems have totaled 23,704 <br /> hours of operation since initiation on 16 April 2001 (Table 8) During the above operational period, <br /> SVE inlet flow rates were recorded at 28 cubic feet per minute (cfrn), differential pressures were <br /> recorded at 0 25 inches of water, and induced vacuum measurements ranged between 44 and 82 <br /> inches of water Utilizing a photo ionization meter'(PID), SVE inlet hydrocarbon concentrations <br /> were measured between 5 5 and 116 parts per million (ppm) Field measurements are summarized <br /> in Table 7 <br /> ' 1 1 <br /> IAdvanced 6 eoEnvi ron mental,Inc <br /> I , <br />