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24 January 2003 <br /> AGE-NC Project No 99-0657 <br /> IPage 7 of 7 _ <br /> I0 The highest concentrations of dissolved hydrocarbons occurred in monitoring wells MW1, <br /> MW4 and MW6,which are located down-gradient of the UST area Iso-concentration maps <br /> depicting the approximate distribution of dissolved TPH-g,benzene and MTBE are presented <br /> in Figures 4, 5 and 6 <br /> • Concentrations of dissolved TPH-g, TPH-d, BTEX, MTBE, and 1,2-DCA have decreased <br /> significantly from the previous three quarters, and concentrations of TAME and EDB have <br /> dropped below laboratory detection limits Although there appears to be a general decline in <br /> overall concentrations,cyclical highs and lows are apparent in the data,with higher reported <br /> concentrations generally during higher ground water periods <br /> • The lateral extent of ground water has only been defined to the east and southeast of the UST <br /> area The vertical extent of petroleum hydrocarbon-impacted ground water has not been <br /> defined <br /> 5.0. RECOMMENDATIONS <br /> lie <br /> Based on the findings of this investigation, AGE recommends <br /> • Continuation of the quarterly ground water monitoring program The next monitoring event <br /> I was performed in January 2003 <br /> • Preparation of a work plan to define the vertical extent of petroleum hydrocarbons-impacted <br /> soil and ground water and the western and southwestern lateral extent of petroleum <br /> Ihydrocarbon-impacted 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 geologic/hydrogeologic <br /> conditions at the site for the purpose of this investigation was made from a limited number of <br /> available data points (ie soil and ground water samples) and subsurface conditions may vary away <br /> from these data points No other warranty, expressed or implied, is made as to the professional <br /> interpretations, opinions and recommendations contained in this report <br /> 0I <br /> IAdvanced GeoEnvironmental,Inc <br />