Document MJDjjVgE52JZXkjyqg2NGmodx

Tbo threo oanplos collected at Dice Erake Preform zhoxed an unusual reduction in airborne fibers. Only one of the units (No. 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, the omission could account for the reduced exposure. Heavy concentrations of airborne asbestos are generated during this phase of the operation. One other location. Disc Erake Inspection, was found to be above the 2 fiber limit. Inspection exposures are generally caused by dust adhering to the surface of the brake pads. Steps should be taken to reduce this exposure either through precleaning of the pads or provision of adequate exhaust ventilation. All collected asbestos samples were also analyzed for airborne lead. As indicated in Appendix 2, only two of the samples reached or exceeded the Threshold Limit Value of 0.15 rug/fa-*. The locations involved included Blok Preform No. 15 ana Blok Preform No. 5. Since these were short-term samples, the listed values (Sample 19, .149 n>g/M3 ana sample 25, .197 mg/ii3) do not represent time weighted concentrations or averaging over an 8 hour workday. The 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 the 8 hour workday. This may or ci2y not be the case. Blok Preform No. 5, which was sampled twice, showed the aforementioned short term level of .197 mg/W* ana an earlier level of 0.137 mg/H3 for an average of 0.167 reg/ti3. Since both exposure locations were Blok Preform units, it is apparent that further collection system improvements are needed. Personal samples of printing inks were taken at Blok Finish Printer No. 2, Strip Finish Hand Printer No. 2, and Strip Finish Printer Machine No. 10. As.anticipated, airborne con centrations of the methyl ethyl ketone solvent in the different inks were minimal, ranging from 2.17 mg/Vl3 to 59.23 mgAP versus the Threshold Limit Value of 590 mg/li3. 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 mg/to3 in air. However, cooking and open flames in the immediate vicinity of the printing units should be prohibited. 2- -