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sampled. If there is more than one sample, randomly select an interior window sill and/or <br /> and exterior window sill. Nate that,i£.there are two or more windows in a room, the <br /> interior and exterior sills may come from different windows. <br /> The basic method for collecting dust clearance samples is the wipe method. Other <br /> dust collection methods may be used provided the user establishes comparability to the <br /> wipe method. <br /> To collect floor samples, use a template or tape to mark off one square foot within <br /> the floor location selected. Use a wipe method to collect dust within the template or taped <br /> area. Clean the template between samples if using a non-disposable template. <br /> Take other appropriate steps to avoid contamination of samples. <br /> For sampling interior and exterior window sills and exterior horizontal surfaces, use <br /> tape to mark the specific section to be sampled. Be sure what is delineated by the tape can <br /> be measured. <br /> After collection of dust, fold the wipe and place it in a clean glass or plastic <br /> container. Label the container so that sample can be associated with the location from <br /> which it was collected. Measure all sampling areas not delineated by the template, and all <br /> cases indicate the sampling area on each label for each container. <br /> HOW TO ANALYZE DUST SAMPLES <br /> Dust samples are to be analyzed for "total lead", not "bioavailable lead". Samples <br /> should be analyzed at a laboratory recognized as proficient for lead in dust analysis by the <br /> EPA National Lead Laboratory Accreditation Program (NLLAP). <br /> CONCLUSIONS <br /> At this time, the standards for clearance are 100 ug/ft' for floors, 500 ug/ft' for <br /> interior window sills, and 800 ug/ft' for exterior window sills and exterior horizontal <br /> surfaces. These numbers are for wipe samples. If a collection method other than the wipe <br /> method is used, the user is responsible for providing comparable standards for clearance. <br /> Samples which are less than the appropriate standard are said to have passed <br /> clearance, and all rooms or areas represented by those samples have passed clearance. <br /> Samples above or equal to the appropriate standard have failed clearance, and all <br /> rooms or areas represented by those samples are said to have failed. <br /> For samples that have failed, the components represented by those samples (floors, <br /> interior window sills, exterior window sills, exterior horizontal surfaces, or interior areas <br /> outside a containment area) must be re-cleaned and re-tested. The process continues until <br /> 3 <br />