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' 29 Ja <br /> • nuary 1999 <br /> AGE-NC Project No 98-0448 <br /> Page 3 of 5 <br />' elevation data for MW-4B were not utilized to contour ground water elevations (Figure 3) Ground <br /> water monitoring data collected in December 1998 in the area of MW-1 through MW-7 indicated <br />' that the ground water flow direction was generally toward the north-northeast at a gradient of 0 016 <br /> Rift, or approximately 84 feet per mile (Figure 3) <br /> I Due to the low gradient at the site, slight variations in ground water measurements or changes of <br /> recharge/discharge of the local ground water could greatly modify ground water flow direction <br />' 32 LABORATORY RESULTS OF GROUND WATER SAMPLES <br /> I During the December 1998 sampling event, TPH-g was detected in a water samples collected from <br /> MW-1, MW-2, MW-4A, MW-4B and MW-6 at concentrations ranging as high as 81,000 <br /> micrograms per liter(µg/1), however,the laboratory reported either unmodified or weakly modified <br /> gasoline was significant (MW-1, MW-2, MW-4A and MW-4B) or heavier gasoline range <br /> compounds was significant (MW-6) <br /> Various BTE&X compounds were detected in water samples collected from wells MW-1, MW-2, <br /> MW-4A, MW-4B and MW-6 at concentrations ranging as high as 17,000 µg/l (xylenes, MW-4A) <br /> The greatest benzene concentration was detected from MW-4A at a concentration of 3,000 µg/l <br /> MTBE was detected in a water sample collected from well MW-4B at a concentration of 1 5 µg/l, <br /> DIPE was detected from MW-1 and MW-4B at concentrations of 34µg/l and 1 1 ug/l, respectively <br /> No other fuel oxygenating compounds were detected from analyzed water samples <br /> Analytical results of the ground water samples are summarized in Table 2 The laboratory reports <br /> (McCampbell Analytical Inc I D No 00069 through 00076) and chain-of-custody forms are <br /> presented in Appendix B <br /> I <br /> 4 0. DISCUSSION AND CONCLUSIONS <br /> Based upon po data collected during the December 1998 monitoring event, AGE concludes <br /> • Ground water was inferred to be: flowing toward the southwest at a calculated gradient of <br /> 0 016 ft/ft, or approximately 84 feet per mile (Figure 3) Due to the low gradient at the site, <br /> I slight variations in ground water measurements or changes of recharge/discharge of the local <br /> ground water could greatly modify ground water flow direction Due to an anomalous <br /> measurement, ground water elevation data for MW-4B were not utilized to contour ground <br /> water elevations <br /> Adianted GeoEnvironmental,Inc <br /> I <br />