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11 June 1999 <br /> AGE-NC Project No 97-0312 <br /> Page 4 of 4 <br /> between the December 1998 and March 1999 sampling events, despite water levels being <br /> over the screens of all wells <br /> The concentration of benzene in UST-2, UST-4 and UST-5 and the concentration of DCA <br /> in UST-5 were above the State of California drinking water Maximum Contaminant Level <br /> (MCL) during the March 1999 monitoring event <br /> 5.0. RECOMMENDATIONS <br /> Based upon data obtained from the site, AGE recommends the following <br /> U Further assessment of the extent of impacted soil has been required by the PHS-EHD A <br /> work plan to fully assess impacted soil at the site was approved by the PHS-EHD in March <br /> 1999 Initiation of the proposed assessment is scheduled for June 1999 <br /> G The next quarterly monitoring event is scheduled for June 1999 In accordance with <br /> monitoring requirements from the PHS-EHD, monitoring wells UST-2 through UST-5 and <br /> the proposed new monitoring well (MW-6) will be sampled at that time <br /> 6.0. LIMTI'ATIONS <br /> Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> environmental consultants practicing in this or similar Iocalities The findings were based mainly <br /> upon analytical results provided by an independent laboratory Evaluation of the <br /> geologic/hydrogeologic conditions at the site for the purpose of this investigation was made from <br /> a limited number of available data points (i a ground water samples, soil 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 recommendations contained in this report <br /> Advanced GeoEmironmental,Inc <br /> i rsuWr .r <br />