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r •r , <br /> of the thoroughness of abatement and subsequent cleanup <br /> activities . Clearance levels are "technology based"--t4At, A-%..._ <br /> they indicate what can be achieved after proper abatement or <br /> interim control actions . Clearance levels- are appropriate since <br /> the marginal cost of attaining them is typically quite low once <br /> an intervention is underway, and EPA and HUD experience indicates <br /> that they can be achieved through proper abatement and interim <br /> control activities . The Agency therefore recommends that the <br /> following clearance levels be met after abatement or interim <br /> control activities have been performed: <br /> Location Lead Loading <br /> Uncarpeted Floors' 100 µg/ft2 (0 . 93 mg/m2) <br /> Interior Window Sills 500 µg/ft2 (4 . 65 mg/m2) <br /> Window Wells 800 µg/ft2 (7 .45 mg/m2) <br /> Section 403 directs the Agency to issue rules that identify <br /> lead-based paint hazards, which include lead-contaminated dust <br /> that would result in adverse health effects . The levels that <br /> will be developed in the section 403 rulemaking will indicate to <br /> risk assessors that . a lead-based paint hazard (for dust) exists . <br /> Obviously, the levels will be different in purpose than clearance <br /> levels- -the former indicating that a hazard is present and the <br /> latter indicating that source control and cleanup have been <br /> appropriately performed. Accordingly, hazard levels are to be <br /> used during risk assessment and re-evaluation, whereas clearance <br /> levels are used to confirm the success of abatement and/or <br /> interim control activities . <br /> Until the standards can be developed under section 403 the <br /> above-listed clearance levels should be used in identifying lead- <br /> based paint hazards and sources of lead exposure, and determining <br /> the need for control actions . The Agency reiterates that these <br /> recommendations are based upon lead levels that have been <br /> demonstrated to be achievable through abatement and interim <br /> control activities and they are not based upon projected health <br /> effects associated with specific dust lead levels . As a result <br /> of continued Agency evaluation of the relationship between <br /> interior dust lead levels and health effects, these hazard levels <br /> 'It is anticipated that: the 1995 revision to the HUD <br /> guidelines will lower the current clearance standard of 200 <br /> Ag/ft' for uncarpeted floors to 100 pg/ft2 . <br /> 6 <br />