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25 August 2003 <br /> AGE-NC Project No. 03-1045 <br /> ' Page 5 of 5 <br /> ' TPH-g and BTEX compounds were detected at a significant concentrations above the <br /> California maximum contaminant levels. TPH-g and benzene were detected in the grab <br /> ground water samples from boring B-1 at maximum concentrations of 2,560,000µg/1 and <br /> 1,300µg/l, respectively. <br /> ' S.O. RECOMMENDATIONS <br /> Based on the results of this investigation, AGE recommends: <br /> • Performance of additional assessment to delineate the vertical extent of TPH-g and BTEX <br /> impacted ground water on the site. <br /> • Preparation of a Corrective Action Plan (CAP) which includes feasibility analyses of <br /> remediation alternatives (e.g. in-situ air sparging pilot test, soil vapor extraction, soil <br /> ' excavation and bio-enhanced remediation or attenuation)to determine appropriate clean-up <br /> method(s) for the site. The CAP should also include a well receptor survey to determine if <br /> local domestic water wells may be at risk from the dissolved petroleum-hydrocarbon plume <br /> at the site. <br /> 6.0. LIMITATIONS <br /> t 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 limitednumber of available datapoints(i.e.ground water samples),and subsurface conditions may <br /> vary away from these data points. No other warranty, expressed or implied, is made as to the <br /> professional interpretations, opinions and recommendations contained in this report. <br /> ' Advanced GeoEnvironmenlal,Inc. <br />