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I21 May 2001 • AGE-NC Project No 95-0173 ' Page 4 of 7 From field and laboratory data collected at the SVE remediation system between 01 January and 31 March 2001,AGE determined the average TPH-g concentration,the average flow rate and calculated the approximate mass and volume of hydrocarbons removed 41 GROUND WATER ELEVATION AND GRADIENT I During the March 2001 ground water monitoring event, depths to ground water in the monitoring wells were measured between 23 45 and 25 83 feet below the tops of well casings, ground water elevations were calculated to be between 14 83 feet and 15 70 feet below mean sea level Ground water elevation at the site increased an average 0 70 feet between the December 2000 and March 2001 ground water monitoring events The ground water elevation data for the March 2001 ground water monitoring event is depicted in Figure 3 ' Ground water flow direction at the site wasg enerally toward the east-northeast at a gradient of 0 003 ft/ft or less, or approximately 16 feet per mile (Figure 3) lie4 2 LABORATORY RESULTS OF GROUND WATER SAMPLES TPH-g was detected in ground water samples collected from wells MW-1, MW-2, MW-3, MW-4, ' MW-6,MW-9,MW-13,AW-1A,AW-1B,AW-2A and AW-2B at concentrations as high as 140,000 gg/l (AW-2A) ' BTEX compounds were detected in ground water samples collected from wells MW-1, MW-2, MW-3, MW-4, MW-6, MW-9, MW-11, MW-13, AW-1A, AW-1B,-AW-2A and AW-2B at concentrations as high as 32,000 µg/1 (toluene, AW-2A) The greatest benzene concentration was ' detected from AW-2A at a concentration of 15,000 µg/1 MTBE was detected in the ground water samples collected from wells MW-3 and MW-4 at ' concentrations of 14 and 20,ug/l respectively No other fuel oxygenated compounds were detected in any other ground water samples Previous and current analytical results of ground water monitoring well samples are summarized in Tables 2 and 3, the estimated extent of dissolved petroleum hvdrocarbons is depicted in cross sectional view C-C' The laboratory reports (McCampbell Analytical Inc Lab I D 63571 through 63587) and chain-of-custody forms are presented in Appendix C 4 3 RESULTS OF VAPOR EXTRACTION • Between 01 January 2001 and 31 March 2001, the SVE and IAS remediation systems were ' Advanced GeoEnvironmental,Inc