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7.0 <br /> UNCERTAINTIES AND LIMITATIONS <br /> The EPA guidance documents for' risk assessment'provide a systematic means for <br /> organizing, analyzing, and presenting information on the nature and magnitude of risks <br /> to public health, posed by chemical exposures. Despite the advanced state of the <br /> current risk assessment methodology, uncertainties and limitations are inherent in the <br /> risk.assessment process. The-quality of available data,incomplete information about <br /> existing conditions and future circumstances, as well as other factors discussed below <br /> contribute to these uncertainties and limitations. This section discusses the following <br /> sources.of,uncertainties and limitations associated with this risk assessment: J V.. <br /> • Data <br /> • Chemical fate'.-and transport modelin <br /> p g <br /> • Receptor exposure assessment <br /> • Toxicological assessment <br /> To overcome uncertainties in. the estimation of health risk and potential impacts to i <br /> groundwater, conservative assumptions were used in every step of the process (exposure <br /> assumptions, toxicity assessment, fate and transport modeling, and risk characterization) <br /> -- <br /> so as not to underestimate site risks. Because multiple conservative assumptions are <br /> used, the overall results of the assessment are more likely to overestimate than to <br /> underestimate actual site risk. <br /> 7.1 DATA COLLECTION AND EVALUATION - <br /> The first step taken in this risk assessment was to evaluate existing sampling and analysis <br /> data from soil sampling during 1994. This risk assessment is based on data specific to �J <br /> the site for soil. <br /> SALDMYELLO.M May 4, 1995 7_1 <br /> j <br />