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The Section 403 Rulemakiig <br /> At present , the Agency' s section 403 rulemaking activities <br /> are focused on a variety of technical issues related to more <br /> accurate assessment of the risks associated with residential <br /> lead-based paint , lead-contaminated dust, •and lead-contaminated <br /> soil . These activities include continued analysis of models and <br /> slope studies, including evaluation of the range of environmental <br /> conditions over which they are adequate . Complicating factors <br /> include likely differences in the bioavailability of lead from <br /> different sources and the variability in dust lead levels on <br /> interior surfaces . Because the Agency' s work on these issues <br /> involves ongoing as well as previously published research, <br /> additional time will be required before levels for lead-based <br /> paint hazards can be determined with more specificity and <br /> proposed in the section 403 rulemaking. <br /> As a result of these additional investigations, the section <br /> 403 rulemaking may differ from this guidance in a number of <br /> areas . These may include the role of dust concentration (in <br /> addition to, or in place of, dust lead loading) , the quantitative <br /> or relative degree of blood lead level reduction that may be <br /> targeted, methods to relate environmental lead measurements to <br /> expected 1 '.00d lead levels, and holistic standards rather th=n <br /> specific -evels for each exposure source. <br /> Attachments <br /> Guidance for Measuring Lead in Soil and Paint <br /> Sampling and Analysis of Dust for Clearance Testing <br /> 15 <br />