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I20 June 2001 • AGE-NC Project No 99-0624 ' Page 3 of 4 ' in a south-southeasterly direction Figure 2 illustrates the contoured ground water elevations as measured on 05 June 2001 I 3 2 LABORATORY RESULTS OF GROUND WATER SAMPLES ' Petroleum hydrocarbons quantified as TPH-g was detected in the water samples collected from MW2 and MW3 at concentrations of 1,000 µg/1 and 66 µg/1, respectively ' Benzene and toluene were detected in the ground water samples from MW-2 (62 µg/1 and 5 4 gg/l, respectively) and MW-3 (1 4 µg/1 and 0 76 µg/l,respectively) Xylenes were detected in MW2 at a ' concentration of 32 gg/l Utilizing EPA Method 8260M, MTBE was detected in samples from MW-2 and MW-3 at ' concentrations of 3,800 pg/1 and 21 µg/l, respectively Analytical results of the ground water samples for the second quarter- 2001 monitoring event are '• summarized on Table 2 The laboratory report (MAI Laboratory 1D 69130-69133), QA/QC and chain-of-custody forms are included in Appendix B 4.0. SUMMARY/CONCLUSIONS ' The following conclusions were drawn from the results of the site investigation ' 0 The average depth to ground water and ground water elevation on 05 June 2001 in monitoring wells on-site was approximately 51 feet below surface grade and 12 5 feet below MSL, respectively ' 0 The inferred ground water gradient on 05 June 2001 was calculated to be 0 003 ft/ft towards the south-southwest I & TPH-g was detected in ground water samples from monitoring wells MW-2 and MW-3, the highest concentration was detected in the sample collected from MW-2 at 1,000 gg/l, a significant decline from a high of 8,900 µg/1 detected in May 2000, but is higher than the March 2000 concentration of 570 µg/1 • Vanous BTEX compounds were detected in the water samples collected from MW-2 and MW-3, the MW-2 sample had the highest concentrations Advanced GeoEnvironmental,Inc I