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1 <br /> single sample at a depth of 39 feet. These concentrations are dust <br /> above method detection limits of 0 . 005 and should not pose a <br />' significant health risk. <br /> We estimate that only 10 to 20 cubic yards of contaminated soil <br />' remain at the site. This soil probably has an average <br /> benzene/toluene concentration of 0 . 005 ppm or less. Any attempt to <br /> remove or remediate the remaining contaminated soil would probably <br /> not be effective and would certainly not be cost-efficient. <br /> 1 5.2 Groundwater <br />' In the March 1993 sampling event, low levels of benzene and xylene <br /> were detected an MW-2 . However, the contamination was not confirmed <br /> an the June or October 1993 sampling events. <br /> Since no contamination has been detected for two consecutive <br /> quarters, we believe that groundwater contamination is very manor <br /> at the site. The contamination detected during the f irst (March <br />' 1993) sampling may have been due to cross-contamination from <br /> shallower depths during drilling or well completion. We recommend <br /> two additional quarters of groundwater monitoring. The next <br /> monitoring event will be scheduled near the end of December 1993 . <br /> 6 . 0 LIMITATIONS <br />' Our professional services were performed using that degree of care <br /> and skill ordinarily exercised by environmental consultants <br /> practicing an this or similar localities. The findings were based <br /> upon analytical results provided by an independent laboratory. <br /> Evaluations of the geologic/hydrogeologic conditions at the site <br />' for the purpose of this -investigation are made from a limited <br /> number of available data points ( i.e. monitoring wells) and <br /> subsurface conditions may vary away from these data points. No <br /> other warranty, expressed or implied, is made as to the <br /> professional recommendations contained in this report. <br /> r <br /> 13 <br />