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t24 January 2006 <br /> . AGE-NC-99-0570 <br />' Page 4 of 5 <br />' 4.0. SUMMARY AND CONCLUSIONS <br /> Based on the results of the July 2005 monitoring event, AGE draws the following conclusions <br />' During the July 2005 ground water monitoring event, the relative ground water elevation <br /> ranged from 7 41 feet(MW-3)to 10 18 feet(MW-5)below MSL The average ground water <br />' elevation was S 66 feet blow MSL, indicating a decrease of approximately 0 17 feet <br /> compared to the April 2005 monitoring event <br /> • Ground water was inferred to be flowing north-northwest under a significant hydraulic <br />' gradient of approximately 0 027 ft/ft This flow direction and gradient is similar to previous <br /> monitoring events <br />' TPH-g was detected in samples MW-1, MW-2 and MW-5 at concentrations of 5,400µg11, <br /> 1,700 pg/1, and 200 pg/l, respectively The dete����tii�on of TPH-g in MW-5 was the first <br /> detection of hydrocarbons after almost fouro� monitoring with no detections of <br />' hydrocarbons, therefore may be due to error in the sampling or analyzing process <br /> • TPH-d was not detected in any of the samples analyzed <br />' • - BTEX compounds were detected in wells MW-1, MW-2 and MW-3 at maximum <br /> concentrations of 39 gg/l benzene(MW-1),6 0 µg/1 toluene(MW-2),460µg/1 ethylbenzene <br /> (MW-1), and 1,155 µg/I xylenes (MW-1) MTBE was detected in wells MW-1, MW-2 and <br />' MW-3 at concentrations of 59 �tg/l, 3 7 Vg/l and 6 0 µg/l, respectively <br /> Y <br />' 5.0. RECOMMENDATIONS <br />' Based upon the findings of the July 2005 monitoring event, AGE recommends <br /> • Continuation of quarterly ground water monitoring events The fourth quarter ground water <br />' monitoring event was conducted In November 2005 The first quarter monitoring event is <br /> scheduled for February 2006 <br /> I <br /> 6.0. LIMITATIONS <br /> IOur professional services were performed using that degree of care and skill ordinarily exercised by <br /> environmental consultants practicing in this or similar localities The findings were based mainly <br /> upon analytical results provided by an independent laboratory Evaluations of the hydrogeologic <br /> conditions at the site have been made from a limited number of available data points(I e ,monitoring <br /> • wells and ground water samples) and subsurface conditions may vary away from these data points <br /> I1 <br /> Advanced GeoEnvironmental,Inc <br />