Validation of the Hazard Ranking System for the Assessment of Feedstock Frequencies in Superfund Site Contaminants

ABSTRACT The utility of the Hazard Ranking System data base as a source for the estimation of frequency of feedstock association with Superfund site contaminants was assessed. For a sample of sites for which followup information was available, the feedstock frequency of association was determined using both the HRS data base and the followup information. There was found to be no statistically difference between the feedstock frequencies as determined from the two methods. On the basis of this study, it is concluded that the prior use of HRS data to estimate such frequencies is thus valid.