f3 6 1887 GRACE To: R.

Copyright 1986 British Journal of Industrial Medicine AU rights ofreproduction of this reprint are reserved in all countries of the world Radiological survey of past and present vermiculite miners exposed to tremolite JC MCDONALD, P SEBASTIEN, AND B ARMSTRONG t .3 British Medical Association, Tavistock Square, London WC1H 9JR - 10003325 British Journal of Industrial Medicine 1986;43:445-449 Radiological survey of past and present vermiculite miners exposed to tremolite JC MCDONALD, P SEBASTIEN, AND B ARMSTRONG From the School of Occupational Health, McGill University, Montreal, Quebec, Canada abstract Chest radiographs taken by a standard technique were obtained from 173 current employees (164 men, 9 women) of a vermiculite mine in Montana, from 80 of 110 past employees resident within 200 miles, and from 47 men from the same area without known exposure to dust.

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INTERNAL CORRESPONDENCE UNION CARBIDE CORPORATION P.O.

INTERNAL CORRESPONDENCE rifii 1 UNION CARBIDE CORPORATION P.G.

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GRACE 3 v(y Conitrvdion Product, Oivition W.!.

7881 Calculation of Number asbestos fibers per oz U0654 # fibers counted 1 EFA mm2 1256 #GO 10 GO Area mm2 0.013 Vol Filt ml 1 Dry Wt grams 0.0959 Dry Wt oz* 0.0033828 U0655 4 1256 10 0.013 1 0.081 0.002857 Asb. fibers/oz Asb. fibers/oz 2.86E+08 286 Million 1.35E+09 1.4 Billion U1986 3 1256 10 0.013 0.1 0.20567 0.007255 4.00E+09 4.0 Billion * 28.34952 grams per oz EQUATION: Number fibers per oz of talc = (# fibers-cted*EFA*100ml)/(#GO*GO Area*Vol filted*Dry wt) EFA= Effective Area of the filter GO = Grid Opening 95% Conf Values based on ASTM Standard Method D6281-98 All 3 samples pass Chi-Squared test of section A6.2 of D6281 Upper and Lower 95% Confidence Values determined from Table A6.1 of D6281 Asb. fibers/oz F/oz Upper Value F/oz Lower Value U0654 286 Million 1.6 Billion 7 Million U0655 ______ 1A_ Billion 3.5 Billion 369 Million U1986 4.0 Billion 12 Billion 820 Million.

Babcock & Wilcox a McDermott company Insulating Products Division P.

b- Ceiling concentrations: Ten fibers, longer than 5 micrometers, per cubic centimeter(10 f/cc).

GARY AUSTIN Page 6 Page 8 1 1 of course, you've had your deposition taken before. 2 If you don't understand any of my questions or you 3 can't hear me for any reason today, just let me know. 4 I'll try to fix the problem, okay?

uji rennsyivania Avenue, N.W.

ST009I6I3 MINIMUM REQUIREMENTS THE DOW CHEMICAL COMPANY APRIL 1984 3RD EDITION ST0091614 These Minimum Requirements for Safety.

DOW CHEMICAL U.S.