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1 <br /> 23 November 1998 <br /> AGE-NC Project No 98-0450 <br /> Page 4 of 4 <br />' ppb in wells BMW-1, BMW-2 and MW-5 <br /> • The concentration of xylenes in 13MW-1 (3,500 jig/1), exceeds the MCL of 1,750 ,ug/l <br /> • Between May and August 1998, concentrations of most analytes have substantially <br /> increased, possibly due to site disturbance during the UST removals and more likely the <br /> increase of ground water elevation <br />' • The greatest concentrations of dissolved hydrocarbons continues to be in the area of well <br /> BMW-1 The greatest concentrations of dissolved MTBE is in area of well MW-5 <br />' • The plume of impacted ground water is not fully constrained in any direction <br /> 5.0. RECOMMENDATIONS <br /> ' Based upon data collected from the site,AGE recommends <br /> • Installation of additional soil borings and monitoring wells to delineate the vertical and <br /> honzontal distribution of petroleum-hydrocarbon impacted soil and ground water at the site <br /> • Continue quarterly monitoring and sampling The next monitoring event should be scheduled <br /> ' for late November 1998 <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 geologlc/hydrogeologlc <br /> ' conditions at the site for the purpose of this investigation are made from a limited number of <br /> available data points (i a monitoring wells), and subsurface conditions may vary away from these <br /> data points No other warranty, expressed or implied, is made as to the professional <br /> ' recommendations contained in this report <br /> Advanced GtoEnviroamental,Inc. <br />��1 <br />