ARCHIVED REPORTS_ROY'S AUTO - HISTORICAL (2)

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it may well be the result of soil being tracked into the house from cutsad.e._.Also, if paint is in sound condition and soil concentrations are low but the interior dust concentrations are high, it is possible that other sources, such as dust carried home from lead-related work, are present . Through a systematic process of elimination, many of the sources of lead in house dust can often be determined. While a detailed discussion on how to perform these types of assessments is outside the scope of this guidance, these issues will be addressed by certification procedures and training requirements for parties involved in lead-based-paint activities (which includes abatement, inspection and risk assessment) currently being developed under section 402 of TSCA. To ensure that excessive exposures are not being caused by the amount of dust in the house, the Agency recommends that efforts always be made to minimize dust in residences, even after paint and dust sources have been addressed through any needed interim control and/or abatement activities . A key component of these efforts is the need to maintain a residence in a cleanable state (i . e. , in such a condition that it can be effectively cleaned by the occupant using reasonable cleaning procedures) . For example, water-damaged or worn wood flooring may have a rough surface with crevices from which dust cannot be readily removed through routine wet mopping. Such surfaces should either be replaced or repaired so that they are cleanable . Likewise, it is important that the residence be effectively and regularly cleaned and that exposures to any interior dust be minimized. Recommended activities to reduce interior dust lead levels and associated exposures include : mopping floors, window ledges, and accessible surfaces with a warm detergent solution; washing pacifiers and bottles if they fall on the floor; washing toys and stuffed animals regularly; and ensuring that children wash their hands before meals, naps , and bedtime. These activities, as well as the importance of nutrition and other factors relevant to children' s risk from lead exposure, should always be stressed as part of public education and awareness programs, regardless of the measured lead concentration in any one medium. Lead-Contaminated Soil Lead-contaminated exterior bare soil is of concern both as a direct source of exposure through inadvertent ingestion due to children' s normal hand-to-mouth activity, and as a contributor to indoor dust lead levels (e.g. , when tracked into a residence from outside) . Common sources of lead in residential soil include deteriorating exterior lead-based paint and historical airborne deposition onto the soil surface as the result of point source- emissions or leaded gasoline . These sources have added substantially to the naturally occurring lead in soils, which 8