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1 <br /> 08 March 1999 <br /> AGE-NC Protect No 95-0130 <br /> Page 4 of 5 <br /> measurements or changes of recharge/discharge of the local ground water could greatly <br /> modify ground water flow direction <br />' • Due to an anomalous field measurements, ground water elevations calculated from VW-I C, <br /> VW-2A and VW-3A were not utilized to contour ground water elevations <br />' • Between the September 1998 and December 1998 ground water monitoring events, ground <br /> water elevation increased an average 0 68 feet at the site <br />' • The ground water surface elevation at the site is between 8 07 and 20 53 feet above the <br /> slotted screen intervals in wells MW-1 through MW-5 and VW-lC and up to 2 66 feet in <br /> wells VW-2A and VW-3A Therefore samples collected from wells MW-1 through MW-5 <br />' and VW-IC may not be representative of dissolved petroleum hydrocarbon concentrations <br /> in shallow ground water <br />' • From September to December 1998, a substantial decrease in dissolved petroleum <br /> hydrocarbon concentrations were observed from wells MW-2, MW-3 and MW-4 which are <br /> wells drowned by 14 feet to 20 feet of water (Table 2) <br /> • Conversely, substantial dissolved hydrocarbon-concentration increases were observed from <br /> well MW-5 <br />' • MTBE was confirmed in wells MW-2, MW-3, VW-1C, VW-2A and VW-3A at <br /> concentrations ranging to 3,200 Azg/l <br /> • TBA was detected in water samples collected from MW-5 at a concentration of 130 µg/l <br /> • No other fuel oxygenates were detected above laboratory limits in any other samples <br /> • BTEX compounds were detected in wells MW-1,MW-2,MW-5, VW-1C, VW-2A and VW- <br /> 3A at concentrations ranging to 49,000,ug/l (benzene, VW-I C) <br /> • The elevated concentrations of petroleum hydrocarbons detected in samples collected from <br /> wells VW-1 C,VW-2A and VW-3A indicate that these wells are within or near the dissolved <br /> petroleum hydrocarbon"core area"of the plume <br /> • The verticaI/honzontal extent of impacted soil and ground water has not been delineated <br /> towards the northeast <br /> 5.0. RECOMMENDATIONS <br /> Based upon the results of this investigation, AGE recommends <br /> • Continued quarterly ground water monitoring The next quarterly monitoring and sampling <br /> is scheduled for March 1999 <br /> Advanced GeoEnviron mental,Inc <br />