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i i11 July 2002 AGE-NC Project No 96-0254 iPage 4 of 4 i 2002 and April 2002 sampling events The prevailing ground water flow direction at the site was generally toward the north, consistent with the previously determined flow directions • The water level in monitoring well GLMW-3 was 1 25 feet above the screened Interval of ithis well • Petroleum hydrocarbon-Impacted ground waterwas encountered in samples from monitoring i wells MW-113 and MW-4 with benzene concentrations exceeding the State of California maximum contaminant level (MCL) of 1 µg/1 in samples collected from the wells i • MTBE were detected in the ground water samples collected from MW-1B, MW-2B and MW-4 at a maximum concentration of 12 gg/l, which is below California's primary Maximum Contaminant Level (MCL) of 13 µg/1,but is above the secondary MCL of 5 pg/l ifor MTBE in drinking water i5.0. RECOMMENDATIONS i• Based on the results of this investigation, AGE recommends, continued quarterly ground water monitoring at the site The next monitoring event should be scheduled for July 2002 Additionally, AGE recommends the preparation of Corrective Action Plan(CAP)as discussed during a meeting iwith Environmental Health Department personnel on 02 November 2001. i6.0. LIMITATIONS Our professional services were performed using that degree of care and skill ordinarily exercised by i environmental consultants practicing in this or similar localities The findings were based mainly upon analytical results provided by an independent laboratory Evaluation of the hydrogeologic conditions at the site for the purpose of this Investigation are made from a limited number of i available data points (i a monitoring well ground water samples), and subsurface conditions may vary away from these data points No other warranty, expressed or implied, is made as to the professional interpretations, opinions and recommendations contained in this report i i i • iAdvanced GeoEnvironmental Inc I