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 1.4 Billion 3.5 Billion 369 Million U1986 4.0 Billion 12 Billion 820 Million.

Memoraridum for the Record Dr.

3* Asbestos Ex josure.

HOW TO USE THESE SEPARATORS Use one page t o r each sep aratio n . 8 elect appropriate ta b , add fu r th e r Id en tificatio n I f d e s ir e d , and cover It with scotch tape.

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TOXICOLOGY AND APPLIED PHARMACOLOGY 113, 1- 1 2 (1992) CONTEMPORARY ISSUES IN TOXICOLOGY Dust Overloading of the Lungs: Update and Appraisal P.

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MEMORANDUM OF TELEPHONE CONVERSATIONS March 9-11, 1976 SUBJECT: Asbestos in Talc The following reporters called in regard to the Washington Post story' on the determination of asbestos in talc by the Mt.

D EC 1982 Raymond J .

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PLAINTI FF'S E,XHIBIT [,et'wi-I3 e-) CAM-93 Lehman 02254

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OFFICERS Pr~sidtnl Karl Schwartzwalder Flint, Mich.

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Laboratory Report Cyprus industrial Minerais Co.