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contribution of different environmental sources of lead to <br /> overall blood lead levels (e.g. , consideration of the importance <br /> of soil lead levels relative to lead from drinking water, paint <br /> and household dust) . It offers a flexible approach to <br /> considering risk reduction options (referred to as the "bubble" <br /> concept) that allows for remediation of lead sources that <br /> contribute significantly to elevated blood lead. This guidance <br /> encourages the risk manager to-select, on a site-specific basis, <br /> the most appropriate combination of remedial measures needed to <br /> address site-specific lead exposure threats. These remedial <br /> measures may range widely from intervention to abatement. <br /> However, RCRA and CERCLA have very limited authority to address <br /> interior exposures from interior paint. For a detailed <br /> discussion of the decision logic for addressing lead-contaminated <br /> sites, see the Implementation section and Appendix A. <br /> Relationship to lead paint guidance. In addition, this <br /> interim directive clarifies the relationship between guidance on <br /> Superfund and RCRA Corrective Action cleanups, and EPA's guidance <br /> on lead-based paint hazards (discussed further in Appendix C) . <br /> The paint hazard guidance will be issued to provide information <br /> until the Agency issues regulations identifying lead-based paint <br /> hazards as directed by Section 403 of the Toxic Substances <br /> Control Act (TSCA)2. Lead-based paint hazards are those lead <br /> levels and conditions of paint, and residential soil and dust <br /> that would result in adverse health effects. <br /> The two guidance documents have different purposes and are <br /> intended to serve very different audiences. As a result the <br /> approaches taken differ to some degree. The lead-based paint <br /> hazard guidance is intended for use by any person who may be <br /> involved in addressing residential lead exposures (from paint, <br /> dust or soil. ) It thus relates to a potentially huge number of <br /> sites, and serves a very broad potential audience, including <br /> private property owners or residents in addition to federal or <br /> state regulators. Much residential lead abatement may take place <br /> outside any governmental program, and may not involve extensive <br /> site-specific study. <br /> This OSWER guidance, on the other hand, deals with a much <br /> smaller number of sites, being addressed under close federal <br /> regulatory scrutiny, at which extensive site characterization <br /> will have been performed before cleanup decisions are made. <br /> Thus, the RCRA and CERCLA programs will often have the benefit of <br /> much site-specific exposure information. This guidance is <br /> intended for use by the relatively small number of agency <br /> officials who oversee and direct these cleanups. <br /> rTitle IV of TSCA (including section 403) was added by the Residential Lead-Based Paint Hazard Reduction <br /> Act of 1992 (Title X of the Housing and Community Development Act of 1992). <br /> —3— <br />