Document aBNam8wzL7vab43mRk8orE8e

Tho threo aanplos collected at Dice Brake Preform showed an unusual reduction in airborne fibers. Only one of the units (Ho. 3) has been redesigned to any extent and would not account for the dramatic decline at all units to 0.43, 0.8, and 0.53 fibcro/ml from previous levels above the five fiber limit. Since the asbestos hoppers above the preform machines were not manually filled at any time during the sampling periods, tho omission could account for the reduced exposure. Heavy concentrations of airborne oebestos are generated during this phase of the operation. On* oUmut location* Dioe'Bxako Inspection^ va %jfeund to above th* fftber Inspection cep^jj^Lx* j caused by dust adhering to the Steps should be take* to reduce this exposure ei^er tftroughl precleaning of tha pads or provision of adequate*eothaSsf^ J ventilation. ] All collected asbestos samples were also analyzed for airborne lead. As indicated in Appendix 2, only two of the samplea*. reached or exceeded the Threshold Limit Value of 0.15 ragA& The locations involved included Blok Preform Ho. 15 ana Blok Preform Ho. 5. Since these were short-tern samples, the listed values (Sample 19, .149 ng/M3 and sample 25, .197 mg/^i3) do not represent time weighted concentrations or averaging over an 8 hour workday. Tho only inference that can be drawn from the values is that they may be representative of the air borne lead concentrations present during any other short term period during tha 8 hour workday. This may or ci2y not be the case. Blok Preform Ho. 5, which was campled twice, showed the aforementioned short term level of .197 mgAt? and an earlier level of 0.137 rog/K^ for an average of 0.167 rag/U^. Since both exposure locations were Blok Preform units, it is apparent that further collection system improvements are needed. Personal samples of printing ink3 were taken at Blok Finish Printer No. 2, Strip Finish Band Printer Ho. 2, and Strip Finish Printer l-iachine Ho. 10. As. anticipated, airborne con centrations of the methyl ethyl ketone solvent in the different inks were minimal, ranging from 2.17 mgAP to 59.2 3 rvgAk* versus the Threshold Limit Value of 5S0 ng/li-*. From the stand point of a fire and explosion hazard, ambient concentrations are not a problem since the Lower Explosive Limit is over 53,000 mgAi^ in air. However, cooking and open flames in the immediate vicinity of the printing units should be prohibited. 2- -