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recommends evaluating <br /> available <br /> collectblood <br /> orlead <br /> additionallbloodsome <br /> lead <br /> Ingeneral, <br /> it may be appropriate to <br /> samples. In general, data from wel�ovideuusefulcted linformati information <br /> of children on or near a site can p the design and <br /> both the risk assessor and site manager. However, <br /> g <br /> conduct of such studies, as well as the interpretation of <br /> such <br /> available <br /> results, are often difficult because of confounding factors <br /> _ as a small population sample size. Therefore, any Tonal <br /> any <br /> lead data should be carefully evaluated b EPA Reg <br /> risk assessors to determine their usefulness. The Guidance <br /> Manual discusses how to evaluate observed blood lead survey data <br /> and blood lead data predicted by the IEUBK model. <br /> The Guidance Manual recommends that blood lead data not be <br /> used alone either to assess risk fits lead exposure IEUBK e or to develop <br /> soil lead cleanup levels. During asserting that site residents <br /> the SAB supported this position by h their <br /> may temporarily modify their behavior (e.g. , <br /> wash <br /> attention is <br /> children's hands more frequently) whenever p <br /> drawn to a site. In such cases, this behavior could mask the <br /> true magnitude of potential risk at a site and lead to only <br /> temporary reductions in the blood <br /> lead <br /> levels <br /> of necessarily ceThus, <br /> blood lead levels below 10 µg/ are <br /> that a potential for significant lead exposure does not exist, or <br /> that such potential could not occur in the future. <br /> Non-residential (adult) screening level. EPA also believes <br /> there is a strong need to develop a non-residential (adult) <br /> screening level. The .Lappropriate <br /> EUBK model is, however, not <br /> for calculating this screening level since it is designed <br /> specifically for evaluating lead exposures in children. At this <br /> time, EPA is considering a few options for developing this <br /> screening level. Several adult models have recently become <br /> em is <br /> available. Developing a screening level by using <br /> yof thth <br /> likely to require significant additional work <br /> by tanAselection of one <br /> This work might include testing, validation, a <br /> of the existing models or development of its own model, <br /> both of <br /> which would require a considerable amount of time. ConsequionY <br /> this would probably be a long-term option. A short-term °proach <br /> would be to develop a screening level based on a simple app <br /> that approximates the more complicated biokinetics in humans. <br /> This can serve in the interim while more sophisticated adult lead <br /> exposure assessment tools can be identified or developed. <br /> NOTICE: Users of this directive should bear in mind that <br /> the <br /> ent are intended solely as guidance, <br /> recommendations in this docum <br /> and that EPA risk managers may act at variance with any of these <br /> recommendations where site-specific conditions warrant, as has <br /> x. ot intene , <br /> been noted above. These recommendations are 5ubstantivedorand <br /> cannot be relied upon, to create any rights, <br /> procedural, enforceable by any party in litigation with the <br /> United States, and may change at any time without public notice. <br /> -15- <br />