Document 5k05vzb2rxya1Q83LJynLoOR

>5/i/ml almost 3 times less than the airborne concentration that was generated when 80 mix was being used at the machine. These results strongly indicate that the dry fluffier asbestos mixes containing the longer fibers will generate more airborne asbestos than -mixes containing asbestos of shorter fiber length Perhaps the shorter asbestos fibers are more effectively bound up in the mix than the longer fibers. in any event, substi tution of the longer fibered asbestos by the shorter fibered asbestos should be investigated. Employee Height: Another of the variables studied was the relationship between the height of the employees and the air borne asbestos levels. Attention is called to Appendix #2 which gives comparative data on employee height and Appendix 4 which gives data about the book preform area. For the purposes of determining the effect of the operator height on airborne asbestos concentrations, a total of 4 samples were taken. The two operators selected were 6 ft. tall and 5 ft. 6 in. short, respectively, and they changed positions so that each worked on all four machines for equal periods of' the sampling day. All of the other conditions, mix type, etc., remained the same. Samples #1 & #2 and samples 12 & 13 represent this sampling situation. Operator #3C-4418 (6 ft. tall) worked on machines 9 and 13 (sample 1) in the morning and then machines 15 and 16 (sample 12 in the afternoon. His levels of exposure were identical: (sample 1-1.46 fibers >5p/ml), (sample 12-1.46 fibers > 5;u/ml) . His average exposure was 1.46 fibers > 5;u/ml. Operator 3C-730 worked on machines 15 and 16 (sample 2) in the morning, and then on machines 9 and 13 (sample 13) in the afternoon. His levels of exposure were: (sample 21.'75 fibers?- 5^/ml) , (sample 13-1.54 fibers> 5/i/ml) . His average, exposure was 1.64 fibers> 5|i/ml. These results indicate that the operator height is not an important factor in regards to employee exposure to airborne asbestos. Employee Working Habits: The type of working habits studied was associated with the degree of care an employee took when working with the mixes and how much dirt was being generated during his normal working activities. Two arbitrary para meters, clean and dirty, were selected. Clean meant that the