Document zoBkdBz702ZxGXm237webNq23

Summary of asbestos concentrations during automobile and truck brake maintenance activities Short-term samples during specific brake repair activities Activity Study> Range of concentrations Number Mean measured (f/ml) samples ' -tion Air bloving dust from drums Brushing of dust from drums Rohl et al, 1976 6.6-29.8 NIOSH, 1972-76 0.45-14.54 Knight& Hickish,!L970 87 2.1-8.2 Rohl et al-,1976 1.3-3.6 Harsh, 1979 0.02-0.2 Grinding linings good exhaust poor exhaust Marsh, 1979 Rohl et al, 1976 Marsh, 1979 Beveling-1 Riveting Rohl et al, 1976 Rohl et al, 1976 0.02-0.4 1.7-7.0 2.8-14 0.4-21.5 23.7-72.0 1.9-2.0 4 16.0 11 .2.9 1 87 8 2 2.5 0.1 3 0.3 10 3.8 4 8.3 6 5 37.3 2 1.9 Sweeping-and cleaning Rohl et al, 1976 . 2.4-3.6 2 3.O'