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1 <br />' I 1 June 2002 <br /> AGE-NC Project No 96-0249 <br />' Page 3 of 6 <br />' 3 0. FINDINGS <br /> Ground water elevation, flow direction and gradient were detenmmed from field data collected on <br />' 26 March 2002, the contaminant impact to ground water was assessed from laboratory analysis of <br /> the ground water samples collected on 27 March 2002 <br />' 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> The depths to ground water in wells MW-1 through MW-6 varied from 8 66 to 10 84 feet below the <br /> tops of the well casings, ground water elevations were calculated to be between 0 92 feet and 1 89 <br /> feet below mean sea level Ground water elevation at the site increased an average 4 08 feet between <br /> I the December 2001 and the March 2002 ground water monitoring events The ground water <br /> elevation data for MW-1 through MW-6 during the March 2002 ground water monitoring event is <br /> depicted in Figure 3 <br /> Ground water elevation data was inferred to be toward an east-west-trending depression ression of the water <br /> • table extending from the east side of Flag City Chevron through the domestic well at the Three B's <br /> Truck Plaza (Figure 3) Ground water gradients range from approximately 0 002 ft/ft around Flag <br /> City Chevron to 0 01 ft/ft around Three B's Truck Plaza <br /> 3 2 LABORATORY RESULTS OF MONITORING WELL GROUND WATER SAMPLES <br /> A total of six ground water samples were submitted for analysis to McCampbell Analytical Inc <br /> (MAI), a DHS-certified laboratory <br /> TPH-g was detected in the water samples collected from wells MW-1, MW-2, MW-3, MW-5 and <br /> MW-6 at concentrations ranging between 390 and 33,000 micrograms per liter(,ug/1), the laboratory <br /> reported each TPH-g chromatogram as having unmodified or weakly modified gasoline patterns <br /> TPH-d was detected in water samples collected from MW-1, MW-2, MW-3 and MW-6 at <br /> concentrations ranging between 310 and 2,600 yg/l, however, the laboratory noted that the diesel <br />' range hydrocarbons in the samples had non-diesel patterns and the samples contained significant <br /> lighter gasoline range compounds <br /> BTEX compounds were detected in water samples collected from MW-1,MW-2,MW-3,MW-5 and <br /> MW-6 at concentrations ranging as high as 5,100 ,ug/l (benzene, MW-3) <br /> The oxygenated fuel additive MTBE was detected by EPA Method 8020 in water sample MW-4 at <br /> . a concentration of 60 ,ug/l, MTBE was detected by EPA Method 8260 Modified in water samples <br /> Advanced CeoEnvironmental,Inc <br /> I <br />