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8.0 <br /> SUMMARY OF RESULTS <br /> The approach used in this risk assessment was based on EPA guidance for conducting <br /> human health risk assessments at Superfund sites (EPA 1989a, b; EPA 1988; EPA 1991 <br /> a,c). The EPA cautions that these documents are intended to provide guidance only and <br /> that considerable professional judgement must be exercised in applying the guidance to <br /> site-specific human health risk assessments. This risk assessment has incorporated <br /> conservative assumptions, in addition to site-specific information, in evaluating potential <br /> exposures so that potential health risks and potential impacts to groundwater would not <br /> be underestimated. <br /> The results of this risk analysis indicate that upon potential exposure to chemicals in soil <br /> and from chemicals moving from soil to other media at the site there are insignificant <br /> carinogenic and noncarcinogenic risks (Le,below a carcinogenic risk of 10'and a hazard , <br /> index of 1). The maximum detected BTEX concentations are each below their <br /> respective USEPA Region IX PRGs and do not warrant further remediation or other <br /> control actions regardless of the future land use. Conservative fate and transport j <br /> modeling indicated that potential concentrations of chemicals of concern in groundwater J <br /> would not cause significant impacts to human health. To date chemicals have not been <br /> detected in groundwater. The two underground fuel tanks along with the majority of the <br /> contaminated soil have been removed. <br /> It should be restated that the RME scenario in this risk assessment used a combination <br /> of site-specific data and conservative assumptions that represent the "high-end" exposure <br /> and more than likely overestimates the actual total cancer risk given the exposure and <br /> behavior patterns assumed for this assessment. , <br /> S:\LDC\YELLO.Rn May 4,1995 8-1 <br />