Document zzKEwa4vY7QqGMoXddXBg4V4g

FILE NAME: Exxon (EXX) DATE: 1951 Nov 2 DOC#: EXX009 DOCUMENT DESCRIPTION: Memo - Analysis of Air Samples for Asbestos Insulating Cement Dust - No. 2 Storehouse  INTEB-OFF i-@> I C S C.O B B E S F O N Hovember 2, 1951 TOs Dr. Howard Hansen, Medical Department SUBJECT Analysis of Air Sasples for Asbestos Insulating Cenent Dost - Ho. 2 Storehous On the norning of Hovember 1, 1951, I collected air samples during the of 150 fifty pound bags of Ho. 450 asbestos insulating cement at Ho. 2 Storehouse. The 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 Ho. 2 Storehouse and unloading was performed through the 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 collecting medium 5 samples were collected using the midget was a solution of 7 % ethyl alcohol and impinger apparatus. 255> water The Sample Ho. Location Dust Concentration (mppcf)* 1 Pallet loading operation Floor cf Storehouse Less than 1.0 ;2 Inside railroad ear ' 2.9 during unloading * Million particles per cubic foot of air. Results of these counts indicate no concentrations of dust, including asbestos, which could be considered excessive. The accepted maximum allowable concentration of asbestos dast 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 rubberoid, packed in 100# burlap bags. It is expected that dust concentrations will be greater for this unloading operation than for the #450 cement. Also, weather conditions may be more favorable for dust dispenslon. I have ordered a standard counting cell to replace the baemacytometer cell which was used for the above counts. The haemacytometer has the distinct disadvantage of having a small sample aliquot volute. Very truly youra, FSV:heb Fred S. Venable, Industrial Hygienist I E ^0 03161