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23 July 2001 » <br /> AGE-NC Project No 97-0312 <br /> Page 3 of 4 <br /> r <br /> I , <br />' surveyed casing elevations (Table 1) Ground water flow direction was determined by contouring <br /> the water elevations on a scaled site plan (Figure 4) Hydrocarbon-impact to ground water was <br /> _ assessed by laboratory analysis and field observations <br /> r <br /> 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> Ground water elevation decreased an average 3 64 feet at the site since the 2$ March 2001 <br /> monitoring event Ground water flow direction was inferred to be northeasterly with a gradient of <br /> approximately 0 001 feet/feet The flow direction is consistent to that of the previous monitoring <br /> event Figure 4 depicts the ground water elevation contours for June 2001 <br /> I J <br /> 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> r E c <br />' TPH-g was detected in samples collected from UST-2, UST-3,UST-4 and UST-5 at concentrations <br /> of 150 micrograms per liter(µg/1), 95 µg/1, 110 µg/1 and 430 µg/1,respectively TPH-d was detected <br />' • in samples collected fromUST-1,UST-2,UST-3,UST-4 and UST-5 at concentrations ranging from <br /> 67 µg/1 to 130 µg/1 Benzene and toluene were detected in samples collected from UST-1, UST-2, <br /> UST-3, UST-4 and UST-5 at concentrations as high as 17 gg/l and 11 µg/1, respectively <br /> Ethylbenzene and xylenes were detected in samples collected from UST-1, UST-2, UST-3 and <br /> UST-4 at concentrations as high as 4 1 µg/1 and 23 µg/l, respectively <br />' Fuel oxygenated compounds were not detected above laboratory reporting levels in the ground water _ <br /> samples collected this quarter The laboratory report(MAI Lab IDs 70419 through 70426)and chain- <br /> of-custody forms are included in Appendix C Analytical results of water samples collected during <br />' the second quarter 2001 are sumnianzed on Table 2 The analytical results of all water samples are <br /> summarized on Table 3 <br />' Ground water samples were not analyzed for chlorinated hydrocarbons during this quarter <br /> r J v <br /> 4.0. DISCUSSION AND CONCLUSIONS <br /> Based upon data collected from the site, AGE concludes <br /> Ground water elevation decreased approximately 3 6 feet at the site between the March 2001 , <br /> and the June 2001 monitoring events The inferred ground water flow direction is toward the <br /> northeast which is consistent with previous results The ground water gradient was 0 001 ft/ft <br /> • across the site <br /> Advanced GcoF,livironmental,Inc <br /> 1 _ , <br />