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07 December 2000 <br /> AGE-NC Project No 97-0301 <br /> Page 4 of 4 <br /> MW-1,analysis of ground water samples collected from MW-1 suggest the core of the plume <br /> ' is impacted by TPH-g, TPH-d and BTEX <br /> • Very low concentrations of dissolved MTBE,TBA, 1,2-DCA and EDB have been previously <br /> ' detected in the area ofMW-1,MW-3 and grab ground water samples collected from P-1,P-2 <br /> and P-4 indicating that there is only a minor impact of dissolved MTBE, TBA, 1,2-DCA and <br /> EDB to ground water in the area assessed <br /> ' The elevated petroleum hydrocarbon concentrations detected in water samples collected from <br /> well MW-1 (screened between 30 and 50 feet bsg) suggest that this well may be screened <br /> ' within or near the dissolved petroleum hydrocarbon "source area" of the plume <br /> • The vertical extent of dissolved petroleum hydrocarbons is not fully defined at the site, the <br /> ' lateral extent of the dissolved petroleum hydrocarbon plume is not fully defined toward the <br /> southeast, northeast, east and west of the current area bound by wells MW-1,MW-2, MW-3 <br /> and MW-4 <br /> 1 <br /> 5.0. RECOMMENDATIONS <br /> Based up g p on data collected during September 2000 AGE recommends <br /> ' Continued quarterly ground water monitoring The next quarterly monitoring and sampling <br /> event is tentatively scheduled for December 2000 <br /> ' Continued utilization of wells MW-1, MW-2, MW-3 and MW-4 for characterization of <br /> ground water conditions at the site Ground water monitoring well MW-5 (screened 80 to 90 <br /> feet bsg)and MW-6(screened 20 to 40 feet)were installed at the site on 04 and 05 December <br /> 2000 and should be included in the quarterly ground water monitoring program <br /> ' 6.0. LIMITATIONS <br /> ' Our 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 upon <br /> analytical results provided by an independent laboratory Evaluation of the hydrogeologic conditions <br /> ' at the site for the purpose of this investigation was made from review of previous consultants reports <br /> and a limited number of available data points(ground water samples)and subsurface conditions may <br /> vary away from these data points No other warranty, expressed or implied, is made as to the <br /> ' professional recommendations contained in this report <br /> Advanced GeoEnvironmental,Inc <br />