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27 September 1999 <br /> AGE-NC Project No 95-0130 <br /> Page 4 of 5 <br /> modify ground water flow direction <br /> • Between the March 1999 and June 1999 ground water monitoring events, ground water <br /> elevation increased an average 1 12 feet at the site, a trend of increasing ground water <br /> elevations has been observed at the site at least since January 1995 <br /> • The ground water surface elevation at the site is approximately 13 feet to 23 feet above the <br /> slotted screen intervals in wells MW-1 through MW-5 and approximately 5 feet to I I feet <br /> above the slotted screen intervals in wells VW-1C, VW-2A and VW-3A Therefore these <br /> wells are "drowned", and yield samples representative of deeper ground water <br /> • TPH-g was detected in water samples collected from wells MW-1, MW-2, MW-3, MW-5, <br /> VW-IC, VW-2A and VW-3A at concentrations ranging between 310 micrograms per liter <br /> (,ug/1) and 270,000 4g11, respectively <br /> • Various BTEX compounds were detected in water samples collected from MW-1, MW-2, <br /> MW-3,MW-5,VW-IC,VW-2A and VW-3A at concentrations ranging between 5 5 4g/1 and <br /> 50,000 Azg/l <br /> • MTBE was detected In water samples collected from well MW-3, VW-2A, and VW-3A at <br /> iconcentrations as high as I,600 Icg/l <br /> • TBA was detected In a water sample collected from well MW-5 and VW-2A at <br /> concentrations as high as 250 ug/1 No other fuel oxygenated compounds were detected <br /> during the laboratory analysis <br /> • From March 1999 to June 1999, a substantial increase in dissolved petroleum hydrocarbon <br /> concentrations were detected in the sample collected from well V W-1 C (Table 2) <br /> Conversely, a substantial decrease in dissolved hydrocarbons were observed from wells <br /> MW-2, MW-3 and VW-3A The deceased concentrations reported from wells MW-2, MW-3 <br /> and VW-3A and the increased concentration reported from VW-I A may be related to a slight <br /> northward shift of the dissolved petroleum hydrocarbon plume <br /> • The elevated concentrations of petroleum hydrocarbons detected In samples collected from <br /> wells VW-1C, 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 vertical/horizontal 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 /> P g , <br /> Advanced CieOEMironmental,Inc <br />