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�1. 05 December 2002 . AGE-NC Project No. 97-0327 Page 4 of 5 • The ground water elevation at the site was within the screened intervals of wells MW-1, MW-2, MW-3 and MW-4, which should yield samples fully representative of shallow ground water conditions. • Dissolved TPH-g was detected in the sample collected from well MW-2 and dissolved TPH-d was detected in samples collected from wells MW-2, MW-3 and MW-4. ., • Minor concentrations of BTEX were detected in well MW-2 indicating a minor impact to ground water in the area assessed. ' • Low concentrations of dissolved MTBE were detected in samples collected from wells MW-1 and MW-2,TBA was detected in the sample collected from well MW-2 and 1,2-DCA was detected in the samples collected from wells MW-1, MW-2 and MW-4 indicating a ' minor impact to ground water in the area assessed. ' S.O. RECOMMENDATIONS '. Based upon data collected during the third quarter 2002, AGE recommends: • Continued quarterly ground water monitoring and sampling of wells MW-1 through MW-4 ' until notified by the SJCEHD that either a reduction in the ground water monitoring program is warranted or that no further action is necessary at the site (i.e. site closure). Generally,only low to non-detect concentrations of petroleum constituents have been reported at the site in wells MW-1 through MW-4,indicating that there is only a minor petroleum-impact to ground water.The TPH-g/TPH-d/BTEXIMTBE soil plume beneath the former UST area appears to extend �, 1 ' vertically at least 55 feet bsg, at least 60 feet toward the southeast, at least 30 feet toward the northwest, at least 40 feet toward the southwest and at least 60 feet bsg toward the northeast. The �� t9 approximate models are shown in cross sectional views A-A ' and B-B' in Figures 5 and 6, respectively. Due to the low to non detectable concentrations of contaminants in the soil and ground V water underlying the site, AGE recommends preparation of a closure summary report for the site. ti 6.0. LIMITATIONS ,t ll Our professional services were perforriied using that degree of care and skiordinarily exercised by environmental consultants practicing in this or similar localities. The findings were based upon ' analytical results provided by an independent laboratory. Evaluation of the geologic/hydrogeologic conditions at the site for the purpose of this investigation was made from review of previous consultants reports and a limited number of available data points (soil and ground water samples) ' Advanced GeoEnvironmental,Inc. 1 '