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07 August 1997 AGE-NC Project No 97-0312 Page 2 of 3 samples were analyzed in accordance with EPA Method 5030 and 8015m for total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d), and in accordance with EPA method 602/8020 for volatile aromatics hydrocarbons(benzene, toluene, ethylbenzene and xylenes, BTE&X) with methyl tertiary-butyl ether(MTBE) 3 0. FINDINGS 3 1 GROUND WATER ELEVATION AND GRADIENT The elevation of round water in each well vias calculated u g by subtracting the depth to water from the surveyed casing elevation (Table 1) Relative to data of the previous monitoring event in March 1997, the ground water elevation decreased an average of 5 6 feet The giound water flow direction was to the northeast with a gradient of 0 0011 ft/ft Figure 3 - Ground Water Elevation depicts the contours 32 ANALYTICAL RESULTS OF GROUND WATER SAMPLES TPH-g was detected in the sample collected from monitoring well UST-5 at a concentration of 600 parts per billion (ppb, reported as micrograms per liter) TPH-d was detected in UST-2 and UST-5 at concentrations of 150 ppb and 140 ppb, respectively BTE&X were detected in UST-5 at concentrations as high as 6 1 ppb (benzene) Xylenes were detected in UST-2 at a concentration of 1 1 ppb MTBE was not detected in the samples collected Other petroleum hydrocarbons were not detected in samples collected at the site The analytical results are summarized on Table 2 The laboratory report (MAI sample Nos 78078 - 78090) and chain-of-custody form are included in Appendix B 4 0 CONCLUSIONS & RECOMMENDATIONS 41 CONCLUSIONS Based upon data collected from the site, the following conclusions are presented During the June 1997 monitoring event, theround water level was approximately 2 feet g PP Y above the screened interval in monitoring wells UST-2, UST-3 and UST-4 The ground water elevation was within the screened interval in well UST-5 Advanced GeaEnviron mental,Inc