Caption title. At head of title: Project summary. Distributed to depository libraries in microfiche. "Aug. 1986." "EPA/600-S2-86-053." Includes bibliographical references (page 9).

"Two analytical methods and two sampling schemes were evaluated for their effectiveness in a project to remove air-entrainable asbestos from Columbus East High School in Columbus, Indiana. The two analytical methods were phase contrast microscopy (PCM) and transmission electron microscopy (TEM). The sampling schemes included a static method and an aggressive one using a leaf blower. The study results indicated that the building abatement did meet the PCM specifications in effect at the time, allowing acceptance of the work and reoccupancy. However, the TEM results revealed airborne asbestos concentrations averaging four times outdoor levels with peak values near 1 million asbestos structures/m3. Aggressive sampling amplified the significance of the situation, producing average airborne asbestos concentrations that were 50 times the outdoor levels, with peak concentrations near 1.5 million asbestos structures/m3 of air. As a result of this study, TEM coupled with aggressive sampling is the currently recommended method of choice for post-abatement clearance."