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Z , <br /> I r <br /> e , <br /> 20 July 1998 <br /> j AGE-NC Project No 98-0448 <br /> I A <br /> Page 4 of 4 <br />' 'MW-2 and the reported non-detection of BTE&X from MW-3 may be due to the <br /> submergence of the screen intervals beneath the ground water table <br />' m ^ The greatest concentrations of dissolved petroleum hydrocarbons continues to be in the area <br /> of wells MW-1 and MW-2, near the "core" of hydrocarbon-impacted soil <br /> • Concentrations of benzene detected in MW-1 and MW-2 were above the State of California <br /> Maximum Contaminant Levels (MCL) for drinking water of 1 0 ppb <br /> • Concentrations of toluene exceeded the MCL of 150 ppb in well MW-2 concentrations of <br />' s ethylbenzene exceeded MCL of 700 ppb in wells MW-1 and MW-2, and concentrations of <br /> xylenes exceeded MCL of 1750 ppb in,well MW-2 <br /> • Utilizing EPA method 8260, MTBE was detected at concentrations higher than the <br /> laboratory reporting limns to the ground water sample collected from MW-2, whereas DIPS, <br /> ETBE,TAME and TBA were not detected in any samples at concentrations above laboratory <br />' reporting limits <br /> 5.0. RECOMMENDATIONS <br /> Based upon data collected from"the site, AGE recommends <br /> • Installation of additional ground water monitoring wells is warranted northwest, south, east <br /> and southeast of the former UST location At least one well should be installed to assess <br /> vertical migration of petroleum hydrocarbon contaminants (i e a dual-completed well) <br /> • Continue quarterly monitoring, the next event should be scheduled for September 1998 <br /> 5.0. LIMITATIONS <br /> A I ~ <br /> Our professional services were performed using that degree of care and shill 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 geologic/hydrogeoiogic <br /> conditions at the site for the purpose of this investigation are made from a limited number of <br /> i, available data paints (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 to this report <br /> f ' <br /> i advanced GmEnviroomcnigl,Inc <br /> f <br />