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k E ' le , r06 December 2002 AGE-NC Project No 97-0333 ! r Page 6 of 9 n r35 FINDINGS' Ground water elevation, flow direction and gradient were determined from field data collected on r 16 August 2002, the contaminant impact to ground water was quantified from the laboratory data r r 3 5 1' GROUND WATER ELEVATION AND GRADIENT 1 The depths to ground water in wells MW-1 through MW-6 were measured between 20 48 and r 22 75 feet below the tops of well casings, ground water elevations were calculated to be between 10 51 (MW-6) and 1149 feet (MW-5) above mean sea level(Figure 3) Ground water elevation at the site decreased by an average of 3 93 feet between the May 2002 and the August 2002 ground ' water monitoring events Ground water flow direction for the area bound by wells MW-1 through MW-6 indicated that local ground water flow direction was radially inward towards the area of wells EW-1,MW-2 and MW-6 at an approximate gradient of 0 017 ft/ft or less; or approximately 90 feet rper mile r 3 5 2 LABORATORY RESULTS OF GROUND WATER SAMPLES I , A total of four ground water samples were submitted to Castle Analytical Laboratory (CAL), a r DHS-certified laboratory,in August 2002 The laboratory analysis detected TPH-g in water samples collected from wells MW-1, MW-3 and MW-4 at concentrations as,high, as 520 µg/1 (MW-3), r TPH-d was detected in water samples collected from wells MW-4 and,MW-5 at concentrations as ` � N I high as 200 µg/1 (MW-5) , BTEX constituents were detected in sample MW-4 utillizing EPA Method 8020 at concentrations r of 9 2 µg/1 benzene, 3 3 µg/1 ethylbenzene and 4 0 µg/l xylenes MTBE was detected by EPA Method 8020 in the water samples from MW-1,MW-3 acid MW-4 at concentrations as high as 1,300' µg/l (MW-3) I I , Uti!lizing EPA Method 8260,MTBE waskdetected from MW-1,MW-3'and MW-4 at concentrations r as high as 960 µg/1 (MW-3),TAME was detected in samples collected from MW-1 and:MW-3 at concentrations of 19 µg/1 and 23 µg/1, PCE was detected from wells MW-3,MW-4 and MW-5 at concentrations as high as 1,500 µg/l (MW-4), and TCE was detected from wells MW-4,and MW-5 rat concentrations as high as 17 µg/1 (MW-5) Additional VOCs were detected in samples MW-4 and MW-5, including chloroform;napthalene, 1,2,4-tnmethylbenzene and 1,3,5-tnmethylbenzene in sample MW-4 and 'chlorobenzene, k 1`,2-dichlorobenzene, 11,4-dichlorobenzene and 1,2,4-trimethylbenzene in sample MW-5 F I Advanced GcoEnviron mental,Inc F , 1 IrE 1 ,I ,