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26 February 2001 <br /> . AGE-NC Project No 95-0173 <br /> IPage 4of8 <br /> From field data collected at the SVE remediation system between 01 October and 31 December <br />' 2000, AGE determined the average TPH-g concentration, the average flow rate and calculated the <br /> approximate mass and volume of gasoline removed <br /> 4 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT <br />' During the December 2000 ground water monitoring event, depths to ground water in monitoring <br /> wells were measured between 25 11 and 26 47 feet below the tops of well casings, ground water <br />' elevations were calculated to be between 15 70 feet and 16 51 feet below mean sea level Ground <br /> water elevation at the site decreased an average 0 22 feet between the September 2000 and December <br /> 2000 ground water monitoung events The ground water elevation data for the December 2000 <br />' ground water monitoring event is depicted in Figure 3 <br /> Ground water flow dii ection at the site was generally toward the east-northeast at a gradient of 0 005 <br /> ft/ft, or approximately 26 feet per mile (Figure 3) <br />' • <br /> 42 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-13,AW-IA,AW-1B,AW-2A and AW-2B at concentrations as high as 170,000 <br /> 4gll (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, MW-13, AW-IA, AW-IB, AW-2A and AW-2B at <br />' concentrations as high as 40,000 µg/1 (toluene, AW-2A) The greatest benzene concentration was <br /> detected from AW-2A at a concentration of 19,000 ,ugll <br />' MTBE was detected in a ground water sample collected from well MW-4 at a concentration of 25 <br /> Fig/l No other fuel oxygenated compounds were detected in any other ground water samples <br /> Previous and current analytical results of ground water monitoring well samples are summarized in <br /> Tables 2 and-3, the estimated extent of dissolved petroleum hydrocarbons is depicted in cross <br /> sectional view C-C' The laboratory reports (McCampbell Analytical Inc Lab I D 56934 through <br /> 56946) and chain-of-custody forms are presented in Appendix C <br /> • Advanced GeoEnvironmental,Inc <br /> 1 <br />