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1 „ 21 August 2000 AGE-NC Project No. 97-0327 Page 3 of 5 + ' 19.31 feet and 19.70 feet below mean sea level. The ground water elevation at the site was within the screened intervals of wells MW-1, MW-2 and MW-3. Ground water elevation at the site increased an average 5.35 feet between the February 2000 and the May 2000 ground water monitoring events. Ground water elevations are depicted in Figure 3. Ground water monitoring data collected in the area of wells MW-1,MW-2 and MW-3 indicated that the ground water flow direction was generally toward the southwest at a gradient of 0.005 ft/ft, or approximately 26 feet per mile (Figure 3). ' 3.2. LABORATORY RESULTS OF GROUND WATER SAMPLES A total of three ground water samples were submitted to a DHS-certified laboratory in May 2000. TPH-g was not detected in ground water samples collected from wells MW-1, MW-2 and MW-3 at concentrations above laboratory reporting limits; however, TPH-d was detected in all three samples ' at concentrations as high as 160µg/1. ' • BTEX compounds were not detected in any of the ground water samples at concentrations above laboratory reporting limits. ' MTBE was detected utilizing EPA Method 8020 in ground water samples collected from wells MW-1 and MW-2 at concentrations as high as 4.7 ,ugll and at concentrations as high as 3.2 µgll utilizing EPA Method 8260. ' TBA was detected in ground water samples collected from wells MW-1, MW-2 and MW-3 at concentrations as high as 55 ug/l. No other fuel oxygenated compounds were detected from the ' laboratory analysis. Analytical results of the ground water samples are summarized in Table 2. The laboratory reports ' (Castle Analytical Laboratory Reference No. 3014 and McCampbell Analytical Inc. Lab I.D. 38896 through 38898) and chain-of-custody forms are presented in Appendix B. ' 4.0. DISCUSSION AND CONCLUSIONS The imp'lications.of the findings from the May 2000ground watermonitoring event are as follows: • Ground water monitoring data collected in the area of wells MW-1, MW-2 and MW-3 ' indicated a ground water flow direction generally toward the southwest at a gradient of 0.005 • ft/ft. Due to the low gradient at the site, slight variations in ground water measurements or Advanced GeoEnvironmentai,inc.