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Hr. 0. B. LaRoy 740-2419
Hr. H. H. Catcham, 770-440 Dr. T. H. Spencer, 791 Hr. V. X. Thompson, 740-3415 Mr. F. A. Woods, 2000-4135
Juno 19, 1973 Industrial Hygiene
Aaboatos Air Sampling kasult*
Bur 0M!
Dm atudMd rptl <hm Mkaitai ait sampling rtaoiu Uat ma raeaivad daring u>la| of NulalU 23, appmiaaMljr 402 aakaatoa. ia tba lari* SID abap, XabeabUt vacan apattM wra aaai to control tM aabaaiaa dost which could baft caused aatlwa caatariaatlw and paraoiaal axpoeure problem In this cron.
This chop la not equipped to verb vttb aabntoa tie aatrlag, machining, drilling, etc., that la necessary to prepare the beater attachneete that are periodically produced. The precaution* that meat be taken to cut the aabaatoo board* era not adequate with the type* of available equipment. The vacuum cleaner* moot be cleaned and handled carefully to prevent personnel exposures during end following eempletion of the work with almost any alight mishap causing expeeure to unprotected personnel.
Thn eoaood result above the potential degree of haaard that exists during this type operation. Vo think this wee caused when the board slipped from the fingers, raising a snail cloud of asbestos dust from tho sawed mater1*1. The dine* were dusty and required vacuuming. Almost any form of careless handling could have erected a hasardowe atmosphere in the vicinity of tho operation.
It ia rocemmaodad that tha asbestos disc* be cut only with equipment that contains adequate exhaust and filter ayarene designed for work with this material.
Tours vary truly.
fW.*vad Attachment
Fred William* Industrial Hygienist
UCC 000318
EMPLOYEE RELATIONS
UNION CARBIDE CORPORATION CHEMICALS AND PLASTICS
SOUTH CHARLESTON, WEST VIRGINIA
MEMORANDUM
June 19, 1973
TO: Fred Williams
FROM:
G. W. Bott
SUBJECT: Air Sampling While Sawing Asbestos Material
Summary
Four of five asbestos samples collected in the 740 large scale shop area exceed the Threshold Limit Value of 5 fibers per milliliter of air greater than 5 jut in length if the job was performed as an eight-hour day operation. This particular job was done in one hour.
Discussion
On June 12, 1973, the Industrial Hygiene group collected air samples tomeasure asbestos fibers during the sawing of 3" x 1" discs
a machinist in the SID department. A Rockwell drill pres^ritted with a disc drill was used to cut Marinite 23 in Bldg. 740 large scale shop.
Mr. Robert Kokott, Sales Representative of Johns-Manville said Marinite 23 contained approximately 402 asbestos.
Vacuum was supplied to the cutting area by an Industrial-type vacuum cleaner mounted to the drill press table. The airborne fibers were collected using membrane filter media, type AA, 0.8 ji pore diameter, white, 37mm in size, at 1 liter per minute flow rate.
Five samples were taken during the cutting operation; two "personal" ad three "area" samples. The "personal" sampler was suspended from
neck as close to the breathing zone as practical. An area sampler was taped to the cutting table six inches from the disc drill, and another sampler was located six feet from the cutting area, five feet from the floor. Duplicate samples were taken of the breathing zone and the cutting area, six Inches from the cutting drill. A single sample was taken six feet away. The samples were analyzed and calculated the same day as they were collected.
UCC 000319
MEMORANDUM
Mr. Fred Williams June 19, 1973 Page Two
Results and Conclusions
/
/ The attached data sheet shows asbestos fibers in excess of the
Threshold Limit Values of 5 fibers per milliliter of air greater than 5 ji
in length in both "personal" samples for the one hour period, A high
number of fibers were found in the area samples which were placed six inches
from the cutting area, (we expected these samples to be high). The "area"
sample, six feet from the cutting area, was relatively clean.
An additional vacuum cleaner was recommended for clean-up and to help evacuate the cutting area.
The data suggests that this operation is dirty and should not be performed in this manner. The second vacuum cleaner should have been effective in reducing the airborne concentration in the vicinity of the cutting for the balance of the discs, 70 additional were needed.
GWB:vsd Attachment
* --7? /(/, ....... G. W. Bott
UCC 000320
Date: June 12, 1973 By: Bott & Elliott
ASBESTOS SAMPLING Bldg. 740 Large Scale Shop
SAMPLE NO.
DESCRIPTION
1 Personal (cut 15 discs)
2 6" from cutter (cut 5 discs)
3 6" from cutter (cut 10 discs)
4 6' from cutter (cut 10 discs)
5 Personal (cut 10 discs)
TIME
0906-0911 0915-0943 0906-0922
0924-0943
0940-1012
0943-1010
DURATION 33 min. 16 min. 19 min. 32 min. 27 min.
AVERAGE COUNT
CONCENTRATION
10.5 44.8
8.58 fiber// milliliter
' 75.5 fibers
4.25
6.03 fibers
1.25
1.05 fibers
9.85
9.83 fibers
CALCULATIONS
------ --------------------- * concentration, fibers per milliliter> 5n C x V x 1000
A - area of the mllllpore filter In mm^ (the 37mm diameter filters have an effective area of 855 mm2)
B - average net fiber count of a blank filter C * counting area in S = average net fiber count for sample V total volume of air sampled, in liters (time x flow rate)
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