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k 12 November 1999 • AGE-NC Protect No 95-0173 ' Page 3 of 5 ' 3 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT During the July 1999 monitoring event, depths to ground water in wells MW-1 through MW-12, ' VW-1, VW-2,AW-1B and AW-2B were measured between 22 80 and 25 17 feet below the tops of well casings, ground water elevations were calculated to be between 14 18 feet and 15 05 feet below mean sea level Ground water elevation at the site decreased an average 0 62 feet between the April ' and the July 1999 ground water monitoring events, but overall, a long term trend of increasing ground water elevations is indicated by data obtained at the site since August 1996 The ground water elevation data for MW-1 through MW-12 during the July 1999 ground water monitoring event ' is depicted in Figure 3 Ground water flow direction for the area bound by wells MW-1 through MW-4, MW-6 and MW-8 ' was generally toward the northeast at a gradient of 0 002 ft/ft, or approximately i l feet per mile (Figure 3), ground water flow direction for the area bound by wells MW-5, MW-6, MW-7 and MW- 12 was generally toward the east-northeast at a gradient of 0 002 ft/ft, ground water flow direction for the area bound by wells MW-9, MW-10 and MW-11 was generally toward the north-northeast at a gradient of 0 002 ft/ft tGround water was approximately 6 feet above the screened intervals in monitoring wells MW-1, MW-2, MW-3 and MW-4, ground water was approximately 26 and 36 feet above the screen ' intervals at AW-113 and AW-213, respectively, therefore these wells are "drowned" and yield samples more representative of deeper screened ground water ' Due to the low gradient at the site, slight variations in ground water measurements or changes of recharge/discharge of the local ground water could greatly modify ground water flow direction ' 32 LABORATORY RESULTS OF GROUND WATER SAMPLES ' A total of eleven ground water samples were submitted to a DHS-certified laboratory in July 1999 TPH-g was detected in water samples collected from wells MW-1 through MW-4, MW-6, MW-S, MW-9, and VW-1 at concentrations ranging up to 220,000 micrograms per liter (ug/l) TPH-d was detected in water samples collected from wells MW-1 througli MW-4, MW-6. MW-7, MW-8, 1\4W- 9, M W-12 and VW-I at concentrations ranging up to 15,000 µg/l, however, the laboratory reported ' that the diesel chromatograms for the samples did not have typical diesel characteristics BTEX compounds were detected in ground water samples collected from wells MW-1 through MW- 4, MW-6, MW-8, MW-9 and VW-1 at concentrations ranging as high as 59,000 µg/l (toluene, V W- ' Advanced GeoEn-wonmentai,Inc 1