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92 Table 59 Long- and short-term sampling of brake lining repair and maintenance work in New York City garage facilities Activity Sampling time fiber concentration (f/ml) Sample TWA Brake change After finishing job Wet brushing of dust Area sample Area' sample Department of Sanitation 136 0.33 190 0.12 10 0.54 395 0.06 390 0.05 0.21 Department of Transporation Brake mechanic 1 Brake mechanic 2 Brake mechanic 3 Wet brushing of dust (mechanics 1,2,3) 150 196 175 194 135 3 3 9 0.15 0.30 0.31 0.26 0.24 2.62 2.22 0.87 . 0.23 0.28 Brake mechanic 1 Brake mechanic 2 Brake mechanic 3 Dry brushing of dust Police Department 129 0.20 68 0.21 124 0.3A 177 0.08 47 0.03 12 0.81 21 0.61 0.20 0.19