Document dQb36KJao0E7rGBYg77xBEyz0
PLAINTIFF'S EXHIBIT
Case: 48106-3 Reference: 1894
AT&l
Bell Laboratories
600 Mountain Avenue Murray Hitt. New Jersey 07974 Phone <201* 582-3000
February 3, 1984
Ms. A. Mignonc SNET 195 Church Street 9th Floor New Haven, Connecticut
06506
Dear Alice:
The air filter cassettes you submitted have been analyzed for asbestos fibers. As indicated on your sampling data sheet,
the samples were collected during removal of asbestos insulation material.
Filter samples were analyzed in accordance with NIOSH P&CAM 239. This method involves sizing and counting fibers using a phase contrast microscope. All fibers which have a physical dimension
longer than 5 micrometers (pm) and a length to diameter ratio of 3 to 1 or greater, are counted.
Fiber concentrations and 8-hour time weighted average concentra tions, expressed as fibers per cubic centimeter (fibers/cc), were calculated from the sampling data you provided and the analytical data. Results are listed on the attached table.
The Occupational Safety and Health Administration's (OSHA) Emergency Temporary Standard (ETS) of 0.5 fibers/cc (8-hour time weighted average exposure limit) is now in effect. The
OSHA 8-hour action level is 0.1 fibers/cc.
Results of sampling are above the action level and indicate the need for medical surveillance of individuals involved in this type of removal work.
Please call if you have any questions.
Sincerely,
Attch. Copy to: (see next page)
003846
A. Mignone - 2
Copy to: W. D. Luty F. L. Provato
) ) SNET
,.-J. M. Degen
CSO
W. J. Schreibeis G. M. Wilkening
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