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I ' 10 January 2003 • AGE-NC Project No 96-0229 ' Page 3 of 5 I (MW-IOB)below mean sea level (MSL), the ground water elevation decreased an average of 142 feet between the May 2002 and the August 2002 ground water monitoring events The ground water surface elevation at the site was within the screened intervals of wells MW-2 through MW-10A,but I was approximately 17 and 19 feet above the screen intervals in wells MW-1 and MW-10B, respectively The ground water elevation data for MW-2 through MW-1 OA during the August 2002 ground water monitoring event is depicted and contoured in Figure 3, elevation data for deep-screened wells MW-1 and MW-I OB were not used to determine ground water gradient because these elevations may be representative of deeper ground water conditions The general ground water gradient in the area of wells MW-1 through MW-10 was calculated to be I approximately 0 003 ft/ft or less, or approximately 16 feet per mile, and inferred to be flowing towards the northeast I3 2 LABORATORY RESULTS OF GROUND WATER SAMPLES I • A total of eleven ground water samples were submitted to Castle Analytical Laboratory, a DHS- certified laboratory in Atwater, California ' TPH-g was detected in water samples collected from wells MW-1, MW-2, MW-3, MW-6,MW-7, MW-9 and MW-10A at concentrations between 330 micrograms per liter(µg/1) in well MW-10A Iand 98,000µg/1 in well MW-2 BTEX constituents were detected in ground water samples collected from wells MW-1, MW-2, MW-3,MW-6,MW-7 and MW-9 at a maximum concentration of 20,000 µg/1(xylene,MW-6),the highest benzene concentration was detected in sample MW-1 at a concentration of 9,900 µg/1 MTBE was detected by EPA Method 8260 in ground water samples collected from wells MW-1, MW-2,MW-3,MW-6,MW-7,MW-9,MW-10(A and B)at a maximum concentration of 1,800µg/1 (MW-6), TBA was detected in a sample collected from well MW-1 OA at a concentration of 62 µg/1, 1,2-DCA was detected in samples collected from wells MW-1, MW-9 and MW-10 (A and B) at concentrations as high as 110 µg/1 at MW-1, DIPE was detected in a water sample collected from MW-1 at a concentration of 9 4 µg11, TAME was detected in samples collected from wells MW-1, MW-9 and MW-IOA at concentrations as high as 4 5 µg/1 at MW-1 No other constituents of concern were detected above laboratory reporting limits in the analyzed samples Previous and current analytical results of ground water monitoring well samples are IAdvanced GeoEnvironmental,Inc I