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I I <br /> r S 4Yf <br /> u <br /> 21 September 2000 <br />' AGE-NC Project No 99-0624 <br /> Page 4 of 4 <br />' wells, the MW-2 sample had the highest concentrations <br /> + Utilizing EPA Method 8260M, MTBE was detected at concentrations of 14,000 µg/1 and <br />' 4 41ig/1 in ground water samples from MW-2 and MW-3, respectively MTBE was not <br /> detected In samples collected from MW-1 and MW-4 The data suggests that MTBE-impact <br /> to ground water does not extend to the west in MW-1 or to the north in MW-4 at this time <br /> + The lateral extent of dissolved MTBE-impacted ground water has not been delineated <br /> northeast, east, and south of MW-2 <br /> I ' <br /> 5.0. RECOMMENDATIONS y <br /> Based on the results of this investigation, AGE recommends <br /> + Continued quarterly monitoring of wells on-site <br /> Additional soil and ground water investigation In the area of MW-2 and the UST system, <br /> focused in the down gradient direction to determine the lateral extent of petroleum <br /> hydrocarbon-impact and MTBE-impact to soil and ground water The next quarterly <br /> Imonitoring event is scheduled for September 2000 <br /> 6.0. LIMITATIONS <br /> Our professional services were performed using that degree of care and skill ordinanly exercised by <br /> Ienvironmental consultants practicing in this or similar localities The findings were based upon <br /> analytical results provided by an Independent laboratory Evaluations of the geologic/hydrogeologic <br /> conditions at the site for the purpose of flus'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 /> recommendations contained in this report ry <br /> I , <br /> r , <br /> I I s <br /> Advanced CeoEnvironmental,loco <br /> I <br /> I <br />