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DEPARTMENT OF HEALTH. EDUCATION. AND WELFARE
PUBLIC HEALTH SERVICE
Consumer Protection and Environmental Health Service
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1014 BROADWAY
CINCINNATI, OHIO 41202
Environmental Control Administration
PLAINTIFFS
REFER TO:
February 28,
EXHIBIT
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1969
Hr. J. W. McMillan Works Manager . Pittsburgh Coming Company Tyler, Texas 75701
Dear Mr. McMillan:
As part of our continuing environmental studies of asbestos processing plants we have prepared the attached table giving numbers of people in our study who are exposed to various concentration ranges of asbestos dust.
The concentrations are given in fibers/ml longer than 5p so that they may be compared with the standards (ACGIH TLV and British Occupational Hygiene Society Hygiene Standard) expressed in these terms. From these standards one would gather that concentrations below 2 fibers/ml are probably safe, and concentrations above 12 fibers/ml are probably hazardous. You will note that most of the exposures are already below 12 flbers/ml.
You should have copies of our reports on your plant in your files. If they have been misplaced, or you wish further information, please let us know. (Where >5p concentrations are not listed you may assume that these are double the >10p fiber concentrations)
One can see that less than 10X of the workers are now exposed to concen trations above 12 fibers/ml. If exposures above this level now exist in your plant, we hope that every effort can be made to reduce them.
Sincerely yours.
Attachment
Howard E. Ayer Chief, Environmental Activities Field Studies Bureau of Occupational Safety
and Health
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