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Ile 13 March 2005 <br /> AGE-NC Project No 96-0263 <br /> IPage 4 of 4 <br /> 29 62 feet above MSL in well MW-1 The ground water at the site was inferred to be flowing <br /> to the north-northwest at an average gradient of 0 005 foot/foot <br /> • Target analytes, including TPH-g,BTEX components,MTBE and/or TAME were detected <br />' in ground water samples collected from wells MW-2, MW-4, MW-5, and MW-7 <br /> • The dissolved hydrocarbon plume extends northward from the former UST and dispenser <br /> areas, but not beyond the down-gradient monitoring wells (MW-8 and MW-10) The <br /> dissolved phase plume has been defined laterally In all directions Iso-concentration maps <br /> illustrating the approximate extent of TPH-g, benzene and MTBE-impacted ground water <br /> are depicted on Figures 4, 5 and 6 <br /> • Based on chemical analyses of ground water samples,the hydrocarbon concentrations have <br /> generally decreased as compared to previous results MTBE concentrations have remained <br /> relatively stable at monitoring well MW-7 since monitoring began and concentrations appear <br /> to be decreasing over the past 3 quarters in the remaining wells <br /> 5.0. RECOMMENDATIONS <br /> • Based on the findings of this investigation AGE recommends <br /> • Continued quarterly monitoring of the ground water monitoring wells The first quarter 2005 <br /> sampling event was performed on 09 March 2005, and <br />' & Continued operation of the ozone sparge system <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(i a 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 interpretations,opinions and <br />' recommendations contained in this report <br /> rAdvanced GeoCnvironmental,Inc <br /> I <br />