Document 71j03epKvQzDg8ZXQndO34XGV
INTERNAL CORRESPONDENCE t :j | tj 5-i
L'l-JEMICALS AND PLASTICS
*
P. O. BOX 8361, SOUTH CHARLESTON, WEST ViftGiNIA 25303
C' /Name} ?" ,:$ion c gallon
lopy to
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
D3ie December 10, 1979
Original,ng Dec! Technical Center, IH/EP
Subieci
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 November 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 in 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
UCC 024184
Mr. 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
RC/sc Attachment
UCC 024185
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UCC 024186
INDUSTRIAL HYGIENE MONITORING FOR
ASBESTOS
.t i
TO: W. T. Shelton, 704 Shop
Computer Ref. W1123
CC: G. F. Hurley H. L. Robinson
PERSON MONITORED Location
EXPOSURE RESULTS
R. E. Raines, John Greenlee
Bldg. 704 Powerhouse 1 Basement
Date
11/24/80
Sample 1 2 3 4 5 6
Cone. .07 fibers/c c .13 fibers/c c
Sampling Time
41 minutes
41 minutes
Comments Personal Sample - R.E. Raines Personal Sample - John Greenlee
Time-Weighted Average Concentration (TWA) Ceiling Concentration
ALLOWABLE EXPOSURE
TWA
________________________
Ceiling ________________________
OSHA OSHA
UCC UCC
Other Other
COMMENTS
Samples taken during stripping of about 20 feet of high pressure steam line in the basement of the Powerhouse. Persons monitored wore respirators and used a sprayer to wet down the insulation to be removed. Very little visible dust was generated during the stripping operation. All necessary precautions were taken during the operation and the workers did an excellent job of cleaning up afterwards. Colorimetric testing of a sample of the insulation removed showed no presence of asbestos.
WORK BY APPROVED BY
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