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addressed immediately for some reason, it would not be <br /> appropriate to delay atn�-nth to the soil , since the soil could <br /> continue to act as a source of exposure . <br /> Lead-Based Paint <br /> Lead-based paint is of concern both as a source of direct <br /> exposure through ingestion of paint chips, and as a contributor <br /> to lead in interior dust and exterior soil . Lead was widely used <br /> as a major ingredient in most interior and exterior oil-based <br /> paints prior to 1950 . Lead compounds continued to be used as <br /> corrosion inhibitors, pigments, and drying agents from the early <br /> 19501s . In 1972, the Consumer Products Safety Commission limited <br /> lead content in new residential paint to 0 . 5% (5000 ppm) and, in <br /> 1978 , to 0 . 06a (600 ppm) <br /> The Department of Housing and Urban Development (HUD) <br /> estimates that three-quarters of pre-1980 housing contain some <br /> lead-based paint . The occurrence, extent and concentration of <br /> lead-based paint increase with the age of the housing. 900 of <br /> privately-owned housing units built before 1940 contain some <br /> lead-based paint; 8001 of 1940-1959 units; and 6201 of 1960-1979 <br /> units .2 <br /> Coatings of residential paint are defined by statute to be <br /> lead-based if the lead content exceeds either 1 . 0 mg/cm2 or 0 . 5% <br /> by weight . Lead-based paint should be either abated or addressed <br /> through interim controls if it is found in any of the following <br /> circumstances : (1) it is deteriorated (in any location) ; (2) it <br /> is present (in any condition) on impact or friction surfaces; or <br /> (3 ) it is present (in any condition) on surfaces that are <br /> accessible for mouthing or chewing by children. "Deteriorated <br /> paint" means any interior or exterior paint that is peeling, <br /> chipping, chalking, or cracking, or is located on an interior or <br /> exterior surface or fixture that is damaged or deteriorated. An <br /> " impact surface" is an interior or exterior surface that is <br /> subject to damage from repeated impacts (e. g. , certain parts of <br /> door frames) . A "friction surface" is an interior or exterior <br /> surface that is subject to abrasion or friction (e.g. , certain <br /> window, floor, and stair surfaces) . A surface is considered to <br /> be accessible for mouthing or chewing by children if it protrudes <br /> from the surrounding area to the extent that a child can chew the <br /> surface, and is within three feet of the floor or ground (e.g. , <br /> window sills, railings, and the edges of stair treads) . <br /> (Recommendations for sampling of painted surfaces are attached. ) <br /> 'Comprehensible and Workable Plan for .the Abatement of Lead- <br /> Based Paint in Privately-Owned Housing: A Report to Congress, <br /> U. S . Department of Housing and Urban Development, Washington, DC, <br /> December 7, 1990 . <br /> 4 <br />