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r DUST CLEARANCE TESTING July 1994 BACKGROUND - • - Section 403 of the Residential Lead-Based Paint hazard Reduction Act of 1992 requires EPA to promulgate regulations which identify lead-based paint hazards, lead- contaminated dust, and lead-contaminated soil. The purpose of this document is to summarize clearance testing procedures to identify lead dust hazards that may remain after lead abatements or application of interim controls. WHO SHOULD SAMPLE Clearance testing for dust should be conducted after lead abatements or after application of interim controls. Clearance testing should be conducted by a party independent of the person or organization that completed the abatement or interim controls. WHEN TO SAMPLE Sampling of dust should take place at least one hour after completion of all abatement and interim control work, including clean-up. All interior rooms or areas and exterior areas should be visually clean before collecting dust samples. If this is not the case, clean the rooms and areas before starting dust collection for clearance testing. WHERE TO SAMPLE Identify the interior rooms or areas and exterior areas of the residence where abatements or interim controls were carried out. If there was an interior containment area, most of the clearance sampling should be conducted within the containment area. If there was no interior containment area, all interior rooms or areas should be sampled. Designate rooms or areas in the interior for sampling. An interior area is a portion of a the residence that is equivalent to a room, even though it is not ordinarily regarded as such. Hallways and stairways are examples of areas in a house. In addition, very large rooms should be divided into areas. If on-site paint removal took place in the interior, collect one floor sample, one interior window sill sample, and one exterior window sill sample from each of the interior rooms or areas designated for sampling. If no on-site paint removal took place in the interior, select one floor sample and one window sample, either a interior or exterior sill, in each room or area designated for sampling. If there were any exterior abatements or interim controls, select one exterior window sill and one other horizontal surface in a living area or near an entryway for testing, preferably from the sides orexterior areas of the house where abatements or controls were applied. A porch railing or the top step of a stairway are examples of horizontal surfaces on the exterior.