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Bell Laboratories
600 Mountain Avenue Murray Hi!'.. New ue'S>ey 07574 Pnorie I2CV| 53i-3000
October 4, 1982
Indians Sell Telephone 210 North Meridian Room 77 4 Indianapolis, Indiana
46204
Dear Mr. Kunce:
The tour oersonal air filter samples you submitted have been analyzed for asbestos fibers. As indicated on your data sheets, the samples were collected on four employees while simulating splicing work in a steam t-.unnel at Indiana University, Bloomington, Indiana.
Filter samples were analyzed in accordance with KTOSH P&CAM 239. This method involves sizing and counting fibers using a phase contrast micro scope. All fibers which have a physical dimension longer than 5 micrometers (ym) and a length to diameter ratio of 3 to 1 or greater, are counted.
Fiber concentrations, expressed as fibers per cubic centimeter (fibers/ cc), were calculated from the sampling data you provided and the analytical data. Results are listed in the attached Table 1. One of the samples approaches the OSHA action level, therefore the time weighted average (TWA) should be determined by calculation or additional sampling.
The Occupational Safety and Health Administration's (OSHA) 8-hour permissible exposure limit (PEL) for asbestos is 2 fibers/cc. The OSHA 8-hour action level is 0.1 fibers/cc.
Please call if you have any questions.
Sincerely,
91-FIT-nob \ r! 'py l-
Keith D. Tait
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