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D3 January 2002 <br /> AGE-NC Project No 95-0167 <br /> Page 3 of 4 <br /> 1 under an average gradient of 0 030 ft/ft Figure 3 illustrates the contoured ground water elevations <br /> as measured on 14 December 2001 <br /> ' 3 2 LABORATORY RESULTS OF GROUND WATER SAMPLES <br />' TPH-g was detected in the water samples collected from monitoring wells MW-1 and MW-2 at <br /> concentrations of 12,000 micrograms per liter (gg/1) and 440 µg11, respectively <br /> BTEX compounds were detected in the water samples collected from monitoring wells MW-1 and <br /> MW-2 at concentrations as high as 1,200 µg11, 1,200 µg/l, 310 µg/l and 2,700 µg/1, respectively <br />' MTBE was detected in MW-2 at a concentration of 15 µg/1 by EPA Method 8020 MTBE was <br /> detected by EPA Method 8260 Modified in sample MW-1 at a concentration of 19 µg11 No other <br /> oxygenates were detected in the ground water samples <br />' Analytical results of water samples collected in December 2001 are summarized on Table 2 and <br /> Table 3 The laboratory report (CTEL Laboratory IDs 0112-077--1 through 0112-077-6), QA/QC <br />' • report and chain-of-custody form are included in Appendix C Figure 4 depicts the estimated areal <br /> distribution of impacted ground water containing TPH-g for 14 December 2001 <br />' 4.0. SUMMARY AND CONCLUSIONS <br /> Data collected at the site indicates that <br /> • The ground water flow direction during this monitoring event was toward the north- <br /> northwest <br /> orthnorthwest at a gradient of 0 030 ft/ft Ground water flow at the site has historically been <br /> towards the northwest Ground water flow direction was not well defined near the former <br />' UST pit during the December 2001 monitoring event <br /> • Relatively high concentrations of TPH-g and BTEX occur in ground water in the area of <br /> monitoring wells MW-1 and MW-2 <br />' • MTBE was present in monitoring well MW-1 at a concentration of 19 µg/1 <br /> • The contaminant plume appears to be confined to the general areas near MW-1 and MW-2 <br />' Petroleum hydrocarbons were not detected in perimeter wells MW-3, MW-4, MW-5 and <br /> MW-6 <br /> • <br /> Advanced G"Environmental,Inc <br />