Evaluation of Airborne Asbestos Concentrations Associated with the Operation and Maintenance of Brakes and Clutches on Nonautomated Heavy Equipment

Figure 3

Sequence and approximate durations of maintenance and operation activities over the course of the study. Air sampling durations are noted elsewhere. “Additional Maintenance Tasks” were performed with bands and linings that were removed from the cranes prior to the start of the study. For Tasks #1, 2, and 5, “settling” refers to a period of inactivity during which airborne fibers may settle.