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' 16 April 2002 <br /> AGE-NC Project No 00-0769 <br />' Page 5 of 6 <br /> previously in any samples collected from the site, the detected concentrations may be false <br /> Positives <br /> • Concentrations of contamination have remained relatively stable in monitoring wells MW-1, <br />' MW-2B,MW-3A and MW-3B since groundwater monitoring began in May 1998 However, <br /> concentrations have steadily decreased in MW-2A during the same period <br /> t • The horizontal and vertical extent of contamination related to an unauthorized release from <br /> the former UST has not yet been defined in soil or ground water <br /> Measured ground water elevation was approximately 14 feet below MSL in the shallow <br />' screened wells (MW-1, MW-2B and MW-3B) during the March 2002 monitoring event <br /> Ground water was-within the screened Interval ofmonitonng wells MW-2B and MW-3B and <br /> Was approximately 5 0 feet above the screened Interval of MW-1 Ground water was <br />' approximately 0 12 feet and 1 49 feet lower In the deeper screened monitoring wells <br /> (MW-2A and MW-3A) than In the shallow screened wells during the first quarter 2002 <br />' monitoring event <br /> 6.0. RECOMMENDATIONS ' <br /> Based on the results of this and previous Investigations AGE recommends <br /> Continued quarterly ground water monitoring The next ground water monitoring event <br /> should be scheduled for June 2002 In addition, ground water samples should be analyzed <br /> for fuel oxygenating compounds, including MTBE, by EPA Method 8260B <br /> • Completion of the scope of work proposed In the AGE-prepared Additional Subsurface <br /> Investigation WorkPlan,dated 19 Apnl 2001 Work to be completed Includes advancing soil <br /> borings for collection of soil and ground water samples and installation of additional ground <br /> water monitoring wells <br /> 1 <br /> 7.0. 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 field <br /> measurements and analytical results provided by an independent laboratory Evaluations of the <br /> geologlc/hydrogeologlc conditions at the site for the purpose of this Investigation are made from a <br />' limited number of available data points(I a monitoring wells,ground water samples)and subsurface <br />' Advanced GeoEnvirunmental,Inc <br />