Document zzXmbKDpRjaw6JmO0ozjbXK2n

Inlra Company ttr. J. A. Collar, Bupervleor Personnel Services Department Research and Engineering Cantor Tebruaiy 20, 1970 Bubjecti Evaluation of Asbeetos Worker Exposure, Brake Research Halt, Scientific Building Aa requested, an Industrial hygiene study w conducted to evaluate aortar exposure to asbestos dust In ttaa Brake Research Halt located at tbs Scientific Building, Research and ftglneerlng Canter* Cm results of tbs air samples taken are contained on the attached data sheet. Cm operations carried on in tbs Brake Researsh Obit Include the neighing and compounding of dry asbestos and cutting, filing, and abrasion wear testing of the compounded asbestos brake lining material, these operations art of an intermittent nature and are carried out in four separate rooms. Only ant of tbese roans Is equipped vlth process exhaust ventilation, vhlle the other rooms have normal building general ventilation. Although local exhaust Is present In the zoom vhere neighing and compounding are carried on, It la not being utilised for the operation. - Cm air samples taken mere evaluated considering the present threshold Unit value of five mppcf end the lover level of tvo mppcf listed by the American Conference of Governmental hidustrlal Hygienists as sn Intended change of the TLT for asbestos dust. As can be seen from the data, all samples are vlthln acceptable Unite. Because of the apprehension exhibited by the employes tovnrd their exposure to asbeatos. It Is our opinion tfflaHmod 1 flcatloa vhlch involve little or no expense are Justified. These modifications Include moving the balance In the velghlng and compounding room to an area vhere existing flexible local exhaust duets could be placed proximal to the balance vhila velghlng. This seme procedure could also be used for the _Jjor used In i^epouryUng. The last' modification vould consist of cleaning the -work bench used In the cutting and filing operation vlth a vacuum cleaner rather than bloving It clean vlth an air hose. Xf there are any questions, or if ve can be of further assistance, please do not hesitate to contact us. ec 1. M. feaarlas I. L. tatling, M.D. Attachment eary I. Uck Jbdastrlal Hygienist 006759 PRODUCED BY FORD SCF-FORD-0628 tebruary 10, 1970 Cat* Sheot Research and Engineering Canter Scientific BuildInff Aabeetoe IXiat Concentrations Location Airborne Aabaatoa Dust Concentration In Killian Partial** par Cubic Toot of Air Siraihold Limit Value 5-0 Change of Threshold Limit Value scheduled for 19T1* 8.0 1. Brake Research Aran, Compounding Operation. Worker'* Breathing Zoom - Air Sample 0.6 8. Brake Research Aran, Cutting and Tiling Operation - Worker' Breathing Zona - Air 8anple 3* Brake Baaearch Area, Wear Testing. Oeoaral Bocn Air Semple 1-3 0.7 Instrumentation! Nina Safety Appliance* Monltalra Pumps vith Nidgat teplager. .Analysis) Light Tiald Count technique j 006760 PRODUCED BY FORD