Document bawyQaV7pLY0GMOkpBMk3gj30

1 asbestos fibers in terms of their ability to stay in Page 2389 2 the air for periods of time once they are released? 3 A Sure. Individual asbestos fibers are very, 4 very small particles, and like all other small 5 particles, they can stay in the air for a very long 6 time. 7 That is, they don't have much of a settling 8 velocity, and they can remain airborne long enough to 9 circulate throughout a workplace, throughout a general 10 environment. 11 There are asbestos fibers in the ambient air 12 from time to time, and those can stay airborne for 13 quite a long time, but as you can see here, 20 meters 14 away we still have a substantial fraction of the 15 original material still airborne. 16 Q That is 60 feet away? 17 A Even more than 60 feet. It is getting close 18 to 65, yes, sir. 19 Q Okay. And at the Bay Bridge where you did 20 your studies for asbestos release from brakes in 1969 21 or '70, that was outdoors with the wind blowing,