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' 04 June 1999 <br /> AGE-NC Project No 98-0448 <br />' Page 3 of 5 <br /> feet bsg) was 146 feet above the ground water elevation measured at MW-4B (screened 45 to 50 <br />' feet bsg), due to the deeper screened interval at MW-4,the ground water elevation data for MW-4B <br /> was not utilized to contour ground water elevations at the site (Figure 3) Ground water monitoring <br />' data collected in March 1999 in the area of MW-1 through MW-7 indicated that the ground water <br /> flow direction was generally toward the south at a gradient of 0 014 ft/ft, or approximately 74 feet <br /> per mile (Figure 3) <br /> 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 /> I <br /> 3 2 LABORATORY RESULTS OF GROUND WATER SAMPLES <br />' <br /> During the March 1999 sampling event,TPH-g was detected in water samples collected from MW-1 <br /> MW-2, MW-4A, MW-4B and MW-6 at concentrations ranging as high as 95.000 micrograms per <br /> tliter(/.zg/1), however,the laboratory reported either unmodified or weakly modified gasoline(MW-1, <br /> MW-2, MW-4A, MW-4B and MW-6) or heavier gasoline range compounds was significant (MW- <br /> 6) a <br /> Various BTEX compounds were detected in water samples collected from wells MW-1, MW-2, <br />' MW-4A and MW-4B at concentrations ranging as high as 18,000 µg/l (xylenes, MW-4A) The <br /> greatest benzene concentration was detected in the sample from MW-4A at a concentration of 3,600 <br /> ,ug/l , <br />' MTBE was detected in a water sample collected from well MW-413 at a concentration of 1 2 ,ug/l, <br /> DIPE was detected from MW-I and MW-4B at concentrations of 20 kcg/l and I 4,ug/1, respectively <br /> No other fuel oxygenating compounds were detected in the 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 05202 through 05209) and chain-of-custody forms are <br /> presented in Appendix B <br /> 4.0. DISCUSSION AND CONCLUSIONS <br /> IBased upon data collected during the March 1999 monitoring event, AGE concludes <br /> • Ground water monitoring data Indicated that the ground water flow direction was generally <br /> toward the south at a gradient of 0 014 ft/ft (Figure 3) Due to the low gradient at the site, <br /> slight variations In ground water measurements or changes of recharge/discharge of the local <br /> IAdvanced GeoEn-wonrnental,Inc <br /> I <br />