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16 May 2002 ' <br /> AGE-NC Project No. 98-0440 <br /> Page 4 of 5 <br /> 0.80 feet between the December 2001 and March 2002 sampling events. Ground levels were ' <br /> d <br />' within the screened intervals of all the monitoring wells on-site.' <br /> The ground water flow direction was inferred using ground water elevation data. The ground water <br />' at the site on 25 March 2002.was inferred to'have been flowing to the north-northwest under-an <br /> average gradient of 0.007'feet/feet across the area monitored..Figure 4 illustrates the ground water <br /> elevation contours. <br /> 3.3. ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected in the water sample collected-from monitoring well MW5 at a concentration of <br /> 210µg11.TPH-d was detected-in the water samples collected from monitoring wells MW5 and MW6 <br /> .at concentrations-of 65 µg11 and.84 µg11, respectively. <br /> Benzene and ethylbenzene were detected in the water sample collected from well MW2 at <br />' concentrations of 0.79µg11 and 0.62µg11;respectively.BTEX compounds were detected in the water <br /> sample collected from MW5 at concentrations of 13 µg/l benzene, 1.9 4g/1 toluene, 3.7 µg/1 <br /> lie ethylbenzene and 2.2 µg11 total xylenes. <br /> None of the analytes were detected at or above laboratory reporting limits in-the water sample <br /> collected from domestic well DW5157. <br /> Current and previous,"analytical results are summarized on Table 2.The laboratory report(MAI Lab <br /> . ID No.0203474-001 through-0203474-007),QA/QC report and chain-of-custody form are included <br /> in Appendix C. <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> ''.. Based on the data collected during this monitoring period, AGE concludes: <br /> • On 25 March 2002, the ground water at the site was inferred to be flowing toward the <br /> north-northwest under an average gradient of 0.007 feet/feet across the area monitored. <br /> Very low conceritrationa ofTPH-g,ethylbenzene and total xylenes were detected in the water <br /> sample collected from boring B8, and very low concentrations of TPH-g, TPH-d, toluene, <br /> ethylbenzene and total xylenes .were detected in the water, sample collected from B9. <br /> Benzene and the fuel additives were not detected in the water samples at or above laboratory <br /> '. reporting limits.The concentrations of analytes detected in the water samples collected from ; <br /> Advanced Geo Environmental,Inc. <br />