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4 <br /> • 25 January 2001 <br /> AGE-NC Project No 97-0312 <br />' Page 3 of 4 <br />' is consistent to that of the previous monitoring event Figure 4 depicts the ground water elevation <br /> contours for December 2000 z <br /> _ t „ <br />' <br /> 3 2 ANALYTICAL T AL RESULTS OF GROUND WATER SAMPLES <br /> r <br /> , l <br />' TPH-g, benzene and toluene were detected in the water sample collected from UST-5 at <br /> concentrations of 340 micrograms per liter (µg11), 1 I µg11 and 14 µg11, respectively TPH-d was <br /> detected in the samples collected from UST-1 through UST-6 at concentrations as high as 510 µg/1 <br /> from UST-1 Petroleum hydrocarbons were not detected in the two on-site domestic water wells <br /> MTBE was detected in the water sample collected from UST-6 at a concentration of 1 4 µg/l TBA <br />' was detected in the water sample from UST-5 at a concentration of 8 7 µg11 No other fuel <br /> oxygenated compounds were detected above laboratory reporting levels in the ground water samples <br /> collected flus quarter The laboratory report (MAI sample Nos 56694- 5670 1) and chain-of-custody <br />' forms are included in Appendix B Analytical results of water samples collected in December 2000 <br /> are summarized on Table 2 The analytical results of all water samples are summarized on Table 3 <br />'• Ground water samples were not analyzed for chlorinated hydrocarbons during this quarter <br /> 1 4.0. DISCUSSION AND CONCLUSIONS <br /> Based upon data collected from the site, AGE concludes „ <br /> • Ground water elevation increased approximately 2 53 feet at the site between the September <br /> and December 2000 monitoring events The inferred ground water flow direction is toward <br />' the northeast which is consistdnt with previous results The ground water gradient was <br /> 0 0007 ft/ft across the site <br />' ,TPH-g, benzene and toluene were detected in the-water samples collected from UST-5, <br /> 'TPH-d was detected in UST-I through UST-6" - <br />' f Low concentrations of MTBE were detected in the water sample,from UST-6 and love <br /> concentrations of TBA were detected in the water sample collected from UST-5 No other <br /> " fuel oxygenated compounds were detected above laboratory reporting levels in the ground <br /> water samples collected this quarter h <br /> Petroleum hydrocarbons were not detected in the two on-site domestic wells on 20 December <br /> 2000 s ; <br /> Advanced CeoEnvironmentai,Inc <br /> r <br />