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i <br /> 11 September 2003 <br /> • AGE-NC Project No 99-0624 <br /> Page 4 of 5 <br /> • Utilizing EPA Method 8260B, MTBE was detected from wells MW-1, MW-2 and MW-3 <br /> at concentrations as high as 19,000,ug/l(MW-2) The MTBE concentrations were above the <br /> Primary MCL of 13 gg/l in drinking water <br /> • The elevated concentrations of petroleum hydrocarbons detected in samples collected from <br /> I well MW-2 indicate that this well is within or near the dissolved petroleum hydrocarbon <br /> "core area" of the on-site plume <br /> • MTBE concentrations increased between the March 2003 and the June 2003 ground water <br /> monitoring events, the significant MTBE-impacted ground water, combined with the <br /> laboratory notations that all chromatograms from MW-2 ground water samples have <br /> contained significant, unmodified or weakly modified gasoline, could be interpreted as <br /> indications of a relatively new release (Figure 4) <br /> 1 ' <br /> 5.0. RECOMMENDATIONS <br /> Based upon data collected during June 2003, AGE recommends <br /> p g <br /> • Continued quarterly ground water monitoring and sampling, the next quarterly monitoring <br /> event is scheduled for September 2003 <br /> • Performance of a receptor survey to locate potential receptors within 2,000 feet of the site <br /> • Preparation of a feasibility studies report to evaluate soil and ground water remediation <br /> alternatives at the site <br /> I <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 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 (i a ground water samples) and subsurface conditions may vary away from <br /> these data points No other warranty, expressed,or implied, is made as to the professional <br /> interpretations, opimons and recommendations contained in this report <br /> i <br /> Advanced GeoEnvironmental,Inc <br /> l � <br /> I <br />