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' 04 January 2002 <br /> AGE-NC Protect No 95-0173 <br />' Page 4 of 8 <br />' laboratory data <br /> From field and laboratory data collected at the SVE remediation system between 01 July and 30 <br /> September 2001, AGE determined the average TPH-g concentration, the average flow rate and <br /> calculated the approximate mass and volume of hydrocarbons removed <br />' 41 GROUND WATER ELEVATION AND GRADIENT <br />' <br /> During the September 2001 ground water monitoring event, depths to ground water in the <br /> monitoring wells were measured between 26 47 and 29 11 feet below the tops of well casings, <br /> ground water elevations were calculated to be between 17 85 feet and 19 25 feet below mean sea <br />' level Ground water elevation at the site decreased an average 2 53 feet between the June 2001 and <br /> the September 2001 ground water monitoring events The ground water elevation data for the <br /> September 2001 ground water monitoring event is depicted in Figure 3 <br /> Ground water flow direction at the site was Inferred to be toward the northeast at a gradient of 0 003 <br /> ft/ft or less, or approximately 16 feet per mile (Figure 3) <br /> 4 2 LABORATORY RESULTS OF GROUND WATER SAMPLES <br /> t A total of seventeenound water les were submitted to a DHS-certified laboratory for analysis <br /> a' 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-1A,AW-1B,AW-2A and AW-2B at concentrations as high as 250,000 <br /> micrograms per liter (µg/1), the greatest TPH-g concentrations were detected in the sample from <br /> 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-I1, MW-13, AW-lA, AW-1B, AW-2A and AW-213 at <br /> concentrations as high as 52,000 4gll (toluene, AW-2A) The greatest benzene concentration was <br /> detected from AW-2A at a concentration of 23,000 ,ug/l <br /> No other fuel oxygenated compounds were detected In any other ground water samples Previous and <br /> current analytical results of ground water monitoring well samples are summarized in Tables 2 and <br />' 3, the estimated extent of dissolved petroleum hydrocarbons Is depicted in cross sectional view C-C' <br /> (Figure 5) The laboratory reports (McCampbell Analytical Laboratory Reference No 3849) and <br /> chain-of-custody forms are presented in Appendix C <br /> • <br />' Advanced GeoEnvironmental,Inc <br /> 1 <br />