Document M735LEXkR4d1zo21ENx5gk7
November 2, 1951
TO: Dr. Howard Hansen, Medical Department SUBJECT: Analysis of Air Sampies for Asbestos Insulating Cement Dust - Ho* 2 Storehouse*
On the morning of November 1, 1951. I collected air samples during the unloading of 150 fifty pound bags of No* 450 asbestos insulating cement at No* 2 Storehouse* lbs material was contained in paper bags*
Weather conditions of this date were cool, rainy and with a wind from
the north* The railroad car containing the shipment of asbestos was spotted on
the north side of No* 2 Storehouse and unloading was performed through ths adjacent
Storehouse door*
`
' Five colored laborers were used in the unloading operation* A fork lift truck pallet was stacked with 20 bags and then conveyed into the storehouse where the pallet was stacked without removing the bags*
Two dust samples were collected using the midget impinger apparatus* The collecting medium was a solution of 75 ethyl alcohol and 25% water:
Sample No*
Location
Dust Concentration (nppef)*
X Pallet loading operation Floor of Storehouse
Less than 1*0
2 Inside railroad ear during unloading
2*9
* Million particles per cubic foot of air*
Results of these counts indicate no concentrations of dU3t, including asbestos, which could be considered excessive* The accepted maximum allowable concentration of asbestos dust is 5 million particles per cubic foot of air*
The next shipment of asbestos cement due to arrive within 1 to 2 weeks,
will be that of /302 rubberold, packed in 100# burlap bags* It is expected that
lust concentrations will be greater for this unloading operation than for the
-'450 cement* Also, weather conditions may be more favorable for dust dispension*
I have ordered a standard counting cell to replace the haemacytometer cell which was
used for the above counts. The haemacytometer has the distinct disadvantage of
having a small sample aliquot volume*
.
?SV:heb
7ery truly yours,
Fred S* Venable, Industrial Hygienist
18-0000741
002161
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