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06 December 2000 <br /> • AGE-NC Project No 95-0173 <br /> IPage 4 of 7 <br /> Between 01 July 2000 and 04 October 2000, AGE determined that the average TPH-g concentration <br /> and flow rate from the SVE system influent soil-gas vapor stream were 1,450 micrograms per liter <br /> (4g/1) and 115 standard cubic feet per minute (SCFM), respectively <br /> I <br /> 3 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT <br /> During the September 2000 ground water monitoring event, depths to ground water in monitoring <br /> wells MW-I through MW-13 were measured between 23 82 and 26 33 feet below the tops of well <br /> casings, ground water elevations were calculated to be between 15 20 feet and 16 00 feet below <br /> mean sea level Ground water elevation at the site decreased an average 2 24 feet between the May <br /> 2000 and September 2000 ground water monrtonng events The ground water elevation data for <br /> I MW-1 through MW-13 during the September 2000 ground water monitoring event is depicted to <br /> Figure 3 <br /> IGround water flow direction for the area bound by wells MW-1 through MW-13, AW-IA and <br /> AW-2A was generally toward the northeast at a gradient of 0 003 ft/ft, or approximately 16 feet per <br /> I . mile (Figure 3) <br /> 3 2 LABORATORY RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected in ground water samples collected from wells MW-1, MW-2, MW-3, MW-4, <br /> MW-6,MW-9, MW-12, AW-IA and AW-2A at concentrations as high as 170,000 /'tg/1 (AW-2A) <br /> BTEX compounds were detected in ground water samples collected from wells MW-1, MW-2, <br /> MW-3, MW-4, MW-6, MW-9, MW-12, AW-lA and AW-2A at concentrations as high as 40,000 - <br /> kcgll (toluene, AW-2A) The greatest benzene concentration was detected from AW-2A at a <br /> concentration of 20,000,ug/l MTBE was not detected in any of the seventeen ground water samples <br /> by the EPA 8020 analysts <br /> MTBE was detected to the ground water sample collected from MW-4 utilizing EPA Method 8260 <br /> I Modified at a concentrations of 19 ggll, respectively The other fuel oxygenated compounds <br /> mentioned above were not detected during the laboratory analysts Analytical results of the ground <br /> water samples are summarized to Table 2 The laboratory reports (McCampbell Analytical Inc Lab <br /> II D 49289 through 49305) and chain-of-custody forms are presented to Appendix C <br /> I <br /> • <br /> IAdvanced CeoEnviranmental,Inc <br />