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and eastern boundaries was based on a conservative extrapolation of the furthest detected <br /> sampling point. <br /> The results of the modeling demonstrate that the petroleum hydrocarbons have only hrruted <br /> migration potential in site soil. Over a 99-year period, tetradecane, used as a conservative <br /> surrogate chemical, rrugrated less than one foot Therefore, ChemRisk® concludes that the <br /> petroleum hydrocarbons will not impact the groundwater beneath the site Therefore, there <br /> are no complete exposure pathways at the site In addition, the most recent groundwater <br /> sampling conducted by ERM-West (January, 1993), reporting non-detect results for total <br /> extractable petroleum hydrocarbons for the three on-site wells, confirms these findings <br /> ChemRisk® concludes that the petroleum hydrocarbons present in soil beneath the Santa <br /> Fe Railway Company site can safely remain in place because they do not pose a threat to <br /> either groundwater resources or human populations No further investigations are necessary <br /> ChemRisk® further recommends that additional groundwater monitoring at the site is <br /> unnecessary <br /> G VOMMSAWAFB FNL\k"' 5 26 93 ES-2 Ch=kR..1d 1997 <br />