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1 <br /> ' 07 June 2002 <br /> AGE-NC Project No 97-0333 <br /> Page 8 of 9 <br /> • Interim ground water remediation (pump-and-treat) was initiated at the site on 21 January <br /> ' 2001 Between 21 January 2002 and 01 April 2002, the pump-and-treat system was in <br /> operation for approximately 70 days and processed approximately 291,902 gallons of water <br /> ' AGE estimates that an average 4,111 gallons of water was discharged per day during this <br /> time <br /> • Dissolved MTBE was detected from grab samples collected at the influent end of the <br /> ' treatment system at concentrations between 19,000 kig/l and 90,000µg/l (Table 2) <br /> • Laboratory analysis of sixteen grab water samples collected at the effluent end of the pump- <br /> and-treat system did not detect any constituents of concern (Table 2) <br /> • Between 01 January 2002 and 01 April 2002, approximately 113 pounds of MTBE was <br /> ' removed from the extracted ground water(Table 1) <br /> F <br /> r <br /> Ip <br /> ' 5.0. RECOMMENDATIONS <br /> ' Based upon the results of the first quarter 2002 investigation, AGE recommends <br /> O Continued quarterly ground water monitoring utilizing wells MW-1 through MW-6 for <br /> characterization of ground water conditions on the site <br /> F ' 0 Future ground water sampling should include full EPA Method 8260 analysis as well as <br /> 6 <br /> analysis for PCBs <br /> r <br /> ' c Continued ground water extraction(interim ground water remediation) from well EW-1 <br /> A work plan addendum, dated 03 April 2002,was submitted to the EHD for installation of additional <br /> shallow and deep-screened(multi-level)ground water monitoring wells,the EHD approved the work <br /> plan addendum by letter dated 03 April 2002 Upon UST Cleanup Fund pre-approval, AGE will <br /> schedule field work for the proposed multi-level well installations <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 mainly <br /> upon analytical results provided by an independent laboratory Evaluations of the hydrogeologic <br /> conditions at the site for the purpose of this investigation are made from a limited number of <br /> available data points(ground water samples), and subsurface conditions may vary away from these <br /> Advanced GcoEnvironmentui,Inc <br />