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' 17 April 2001 <br /> • AGE-NC Project No 99-0624 <br /> Page 3 of 4 <br /> southerly flow around the eastern half Figure 2 illustrates the contoured ground water elevations as <br />' measured on 05 March 2001 <br />' 3 2 LABORATORY RESULTS OF GROUND WATER SAMPLES <br />' Petroleum hydrocarbons quantified as TPH-g and MTBE were detected in ground water samples <br /> collected from monitoring wells MW-1,MW-2 and MW-3 <br />' TPH-g was detected at concentrations as high as 570 micrograms per liter (µg/1) in the sample <br /> collected from MW-2, benzene and xylene compounds were detected at concentrations as high as <br /> 58 µg/l and 3 5 lcg/l respectively <br />' MTBE was detected in samples from all three monitoring wells at concentrations of 2 1 gg/1(1\4W- <br /> 1), 2,700 gg/1 (MW-2) and 25 gg/1 (MW-3) <br />' Analytical results of the ground water samples for the first quarter - 2001 monitoring event are <br /> summarized on Table 2 The laboratory report (MAI Laboratory ID 61687-61689), QA/QC and <br />'• chain-of-custody are included in Appendix B <br />' 4.0. SUMMARY/CONCLUSIONS ` <br /> The following conclusions were drawn from the results of the site investigation <br /> •' r <br /> The average depth to ground water and ground wife elevation on 05 March 2001 in <br />' monitoring wells on-site was approximately 51 feet below surface grade and 12 0 feet below <br /> MSL, respectively <br /> • The inferred, ground water gradient on 05 March 2001 was calculated to be 0 002 ft/ft <br />' towards the southwest and south <br /> • TPH-g was detected in ground water samples from monitoring wells MW-1 to MW-3, the <br />' highest concentration was detected in the sample collected from�MW-2 at 570 '4g/l, a <br /> significant decline from a high of 8,900 gg/l detected in May 2000 <br />' • Various BTEX compounds were detected in the water samples collected from all four <br /> monitoring wells, the MW-2 sample had the highest cohoentratlons <br /> • Utilizing EPA Method 8260M, MTBE was detected at concentrations of 2,700 µg/1 and 25 <br />' µg/1 inground water samples from MW-2 and MW-3, respectively MTBE at 2 1 µg11 was <br /> also detected for the first time in the sample collected from MW-1 <br />' Advanced GcoEnvaronmental,Inc <br />