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! 08 June 2003 <br /> • AGE-NC Project No 98-0448 <br />! Page 5 of 9 <br />! that the apparent formation of a sediment plug in the well at between 11 and 20 feet below surface <br /> grade (bsg) may have affected the depth to water measurement <br />! 42 LABORATORY RESULTS OF GROUND WATER SAMPLES <br />! TPH-g was detected in water samples collected from wells MW-2 and MW-4A at concentrations of <br /> 9,500 micrograms per liter (µg/1) and 2,200 µg11, respectively The laboratory reported that the <br /> sample chromatograms all contained significant unmodified or weakly modified gasoline The , <br />! inferred extent of dissolved TPH-g is depicted in plan view in Figure 4 <br /> Various BTE&X compounds were detected in water samples collected from MW-2, MW-4A and <br />! MW-4B at concentrations as high as 2,400 µg/1 xylene (MW-2) The maximum benzene <br /> concentration was detected in the sample collected from MW-2 at a concentration of 55 µg/1 <br /> IMTBE was detected by EPA Method 8260B in a water sample collected from wells MW-4B at a <br /> concentration of 1 5 µg/1 <br /> INo 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 (McCampbell Analytical Inc Work Order 0212065) and chain-of-custody forms are <br /> presented in Appendix C <br />! 43 RESULTS OF VAPOR EXTRACTION <br /> Between 17 December 2002 and 20 March 2003, the SVE and IAS remediation systems were <br /> continuously operational for 1,922 hours, the SVE and IAS systems have totaled 16,888 hours of <br /> operation since initiation on 16 April 2001 (Table 7) During the above operational period,SVE inlet <br /> flow rates ranged between 30 and 39 cubic feet per minute (cfin), differential pressures ranged <br /> between 0 30 and 0 50 inches of water, and induced vacuum measurements ranged between 68 and <br /> 75 inches of water Utilizing a photo ionization meter(PID), SVE inlet hydrocarbon concentrations <br /> were measured between 7 and 81 parts per million (ppm), generally Field measurements are <br /> summarized in Table 6 <br /> Advanced GeoEnvironmental,Inc <br /> I ' <br />