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29 September 2003 <br /> • AGE-NC Protect No 99-0654 _ <br /> Page 5 of 5 <br /> • TPH-g and MTBE were detected in all grab ground water samples at maximum <br /> concentrations of 110,000 gg/1(B-1)and 45,000µg11(B-4),respectively,BTEX compounds <br /> were detected in ground water samples B-1 through B-3 at a maximum concentration of <br /> 26,000 pg/l (toluene in B-1), and 1,2-DCA was detected in sample B-1 at 2,600µg/1 <br /> • BTEX compounds,MTBE and 1,2-DCA are all present at concentrations significantly above <br /> the California maximum contaminant levels for these contaminants <br />' 5.0. RECOMMENDATIONS <br /> Based on the results of this investigation, AGE recommends <br />' • Performance of additional soil and ground water assessment to delineate the vertical and <br /> lateral extent of petroleum-hydrocarbon Impact <br /> • Installation of monitoring wells to delineate the extent of contaminated ground water and <br /> monitor ground water flow rate, flow direction, and contaminant concentrations <br /> • Performance of a well receptor survey to determine If local domestic water wells may be at <br /> risk from the dissolved petroleum-hydrocarbon plume at the site <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 mainly <br /> upon analytical results provided by an independent laboratory Evaluations of the <br /> geologic/hydrogeologic conditions at the site for the purpose of this investigation were made from <br /> a limited number of available data points (i a soil and ground water samples), and subsurface <br />' conditions may vary away from these data points No other warranty,expressed or implied,is made <br /> as to the professional interpretations, opinions and recommendations contained in this report <br /> Advanced GeoEnvironmental,Inc <br />