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Ile O1 May 2006 <br /> AGE-NC Project No 99-0657 <br />' Page 4 of 4 <br /> increased in wells MW-1 and MW-2 <br /> • MTBE concentrations decreased slightly in wells MW-1 and MW-6 and remained below <br /> laboratory detection limits in well MW-3 for the second consecutive quarter <br /> • Petroleum hydrocarbon concentrations in well MW-4 generally decreased significantly since <br /> the last monitoring event in November 2005 Graphs exhibiting petroleum hydrocarbon r <br />' concentration trends in each monitoring well, as well as depth to ground water and ground <br /> water elevation trends, are included in Appendix D <br /> • No target analytes were detected at or above laboratory reporting limits in the ground water <br />' samples analyzed from deep Interval wells MW-10 and MW-11 <br /> • The lateral extent of petroleum hydrocarbon contamination In ground water has been <br />' currently defined to the west by well MW-5, and east, south, and north(CPT-1) of the UST <br /> area The lateral extent is not fully defined to the west of the UST area beyond well MW-6 <br /> (Figures 4 through 7) <br />' The vertical extent of petroleum hydrocarbon-impacted ground water is defined off-site In <br /> the area of soil boring CPT-1 The vertical extent of petroleum hydrocarbon-Impacted ground <br /> • water Is defined on-site by wells MW-10 and MW-11 <br /> 5.0. RECOMMENDATIONS <br />' Based on the findings of this Investigation, AGE recommends <br /> • Continuation of the quarterly ground water monitoring program, as required by the EHD <br />' Preparation of a remediation feasibility report for soil and ground water <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 a limited number of available data <br /> points(le Ground water samples)and subsurface conditions may vary away from these data points <br /> No other warranty,expressed or implied,is made as to the professional interpretation`s,opinions,and <br /> recommendations contained in this report <br /> Advanced GeoEnvironmental,Inc <br /> t <br />