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INTERNAL CORRESPONDENCE
CHEMICALS AND PLASTICS
P. O. BOX 8361, SOUTH CH.ARiESTON, WEST VIRGINIA 25303
Mr. D. L. Johnson 511--5518 (512)
Mr. C. W. Carman Mr. G. F. Hurley Mr. C. R. Johnson Mr. D. R. Paugh Mr. P. A. Perry
Mr. c. E. Richardson
Mr. H. L. Robinson Mr. E. C. Shipley
Da., December 10, 1979
cep- Technical Center, IH/EP
Subfeci
Asbestos Monitoring 704 Powerhouse
PROJECT
Determine the exposure of Construction workers to asbestos fibers during insulation stripping in Building 704.
DATE OF SURVEY
November 26 and 27, 1979
DISCUSSION
On_JTovember 26 and 27, 1979, separate breathing zone samples were taken on Construction workers to determine their exposure to asbestos fibers while they were stripping and bagging suspected asbestos containing insulation from the exhaust ducts of Number 3 and Number 4 boilers in Building 704 - Powerhouse. During the stripping and clean-up procedure all Construction workers in the work area wore Norton disposable dust respirators, gloves, and coveralls. The boilers had been shut down so the insulation could be properly wetted before and during the stripping. Plastic was placed around the duct to prevent debris from the stripping from falling through the floor grating. Stripped insulation was placed iq bags on site for disposal.
CONCLUSIONS
The results are given in the attached table. An 8-hour timeweighted average was calculated for November 26, 1979, since the
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Hu. D. L. Johnson
2
12/10/79
Construction workers were monitored during their total exposure for that day. The values are well below the OSHA standard of 2 fibers > 5 pm/cm3 on a time-weighted average for eight hours.
REFERENCES Volume 38C-29X4-Rla Asbestos, Dust Determination By Membrane Filter Technique Using Phase Contrast Microscopy
RESULTS See attachment.
REPORT PREPARED BY Ruth Clise Technical Center Industrial Hygiene Group
REPORT APPROVED BY
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