Document dn2GmBkMxxrYDGLkLZ42KGBdB
INTERNAL CORRESPONDENCE
CHEMICALS AND PLASTICS
h (Nnul DMticn Location
Mr. R. J. DuBrul Building 2
Copy to
Mr. A. F. Booth Mr. G. D. Brown Mr. T. L. Collins C. U. Demehl, M.D. Mr. P. E. Drake Mr. D. L. Garrison Mr. R. H. Johns Mr. G. R. Kraft Mr. H. C. McGinnis Mr. R. E. Peele Mr. B. G. Perry Mr. B. D. Tissue J. J. Welsh, '1 T ^
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INSTITUTE PUNT P. C. BOX 2831. CHARLESTON. WEST VIRGINIA 25330
DoN .1 August 1973
Originating Bapt, j
Amwtring Itlltr daI*
Subjort
jAsbestosis
Enclosed is a report describing a conducted on employees of the Plant Maintenance
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; AUG 61973
i MEDICAL DEPARTMENT
Mr. F. H. Larrison
LOCATION
TYPE OF SAMPLE
Bagger Area General
It !t
ti ri
II ft
II H
GA GA GA GA GA
Shifter's OfficeGeneral
It If
II If
GA GA GA
Sample BalconyGeneral
II II
GA GA
Wet Side-General
It It
It It
GA GA GA
Resin Grade Bagger
II II II II it n ii ii il ii ft n l it
PA PA PA PA PA PA PA PA
South Fence LineGeneral
It It
. GA GA
--2--
August 1 , 1973
TIME OF DAY
FIBERS-5MICR0NS and LONGER/
AIR
WEIGHTED EXPOSURE BASED ON SAMPLING PERIOD_________
9:25-10:30A 10:30-11:47A
1:14- 2:l4P 2:14- 3:05P 3:05- 4:07P
0.81 1.01 0.42
1:29 0.99
0.90
10:35-H :45A 11:45-12:55P 12:55- 2:20P
0.40
0.47 0.41
0.42
2:10- 2:53P 2:53- 3:27P
9:20-10:00A 10:00-_11:30A
1:15- 2:15P
9:00- 9-.hOk 9:40-10:20A 10:20-11:OOA 11:00-11:40A 1:10- 1:50P 1:50- 2:30P 2:30- 3:10P 3:10- 3:50P
1:30-2:55P 2:55-4:00P
0.69 0.8l
0.27 0.64 0.29
0.85 1.22 0.78 0.70 0.65 1.81 1.37 1.58
0.31 1 0.35
0.74 0.37 1.11
0.33
A08383
Mr. F. H. Larrison
-3--
August 7, 1973
LOCATION
Mine Site
Mine Area General II tl II If
Michigan Loader Operator II tl tl ft
Caterpillar Operator r ft ti it
TYRE OF SAMPLE
PA PA PA
PA PA PA
PA PA PA
TIME OF DAY
FIBERS-5 MICRONSand LONGER/ml of
AIR
WEIGHTED EXPOSURE BASED ON SAMPLING PERIOD
9:30-10:47A 10:47-11:30A 11:30-12:00N
9:50-10:40A 10:40-11:18A 11:18-11:55A
10:00-10:55A 10:55-H:23A 11:23-11:58A
0.58 ) 0.50 > 0.69 )
v 1.77 \ 1.14 C 1.62 j
0.55 1.53
0.53 N 0.49 C 0.58 f
0.54
As you will note actual weighted exposures of personnel or potential exposures as might be expected, for example, in the shifters office were in all cases less than 5.0 fibers per milliliter of air. Nevertheless, in areas involving dry operations personnel wore appropriate respirators. I recommend that this practice be continued until enough information is available that shows we are well within the existed limit of 5.0 fibers/ml and the soon-to-come limit of 2.0 fibers/ml.
For one interval during the activity of the bagger-loader operator in the standard grade area, the concentration of fiber exceeded 10/ml which I believe is an action point in the OSHA regulation even though the weighted average is less than 5 fibers/ml. I believe, you will wish to check in to this.
A08384
Mr. F. H. Larrison
--4^
August 7, 1973
I don't know why this jump in concentration occurred. The fiber concentrations outside the buildings did not appear to
be significant during this visit as witness the results for the south fence line with a north to south wind. I have seen worse days. MINE:
Fiber concentrations at the mine site were not high even though a brisk wind was blowing. It is interesting to note that the highest readings were obtained inside the closed cab of the Michigan loader rather than on the open seat of the Caterpillar bulldozer. On the latter, however, it was noted that there is a considerable exposure to diesel exhaust fumes. The quantity may not be excessive but it quickly shows on a filter paper sampler. All personnel at the mine site wore respirators, a practice which I believe should continue to be encouraged regardless of present findings.
Very truly yours,
RfM: jr
P. W. McDaniel Industrial Hygiene Engineer