Document QXKEVv1M3G9k1m74L3kZO2N45

UNION CARBIDE CORPORATION TECHNICAL CENTER SOUTH CHARLESTON. WEST VIRGINIA MEMORANDUM June 20, 1984 60/`Oi4-2> #Ub) TO: D. E. Raines COPY: B. H. Avashia, M.D. A. S. Howard C. P. Maxwell M. L. Mills D. R. Paugh R. E. Peele R. G. Rowe, M.D. FROM: M. A. Patel SUBJECT: Dust and Chemicals Exposure Monitoring in Insulation Shop, Building 2018 Dear Dennis: During the months of March and April, 1984, the Technical Center Industrial Hygiene Group conducted a survey in the Insulation Shop, Building 2018, to determine the extent of employees' exposure condition to various chemicals and dust in the shop. In this survey we monitored for total and respirable dust, methylene chloride, toluene-2,4-diisocyanate (TDI), dimethylformamide (DW7), hydrogen sulfide (H2S), total hydrocarbons and benzene soluble fractions of the total particulate matters (BSFTPM). Total and respirable dust levels were measured in the shop where various insulation materials are cut. All personnel exposure monitoring was done for respirable fraction of the total dust. All area and source monitoring was done for total dust. The permissible exposure limits for respirable and total dust are 5 and 10 mg/m^ respectively. Results of monitoring for dust are shown in Table I indicating very low levels of exposure to respirable and total dust. This is indicative of an effective ventilation system in the shop. Table II shows the results of BSFTPM levels at the tar pit. The permissible exposure limit for BSFTPM is 0.150 mg/mJ. Results show the exposure conditions well below this limit. Table III shows the monitoring results of methylene chloride, TDI, DM7, H2S and total hydrocarbons. The permissible exposure limits for these chemicals are 50 ppm, 0.02 ppm, 10.0 ppm, 10.0 ppm and 100 ppm respectively. The results indicate that the exposure conditions in general are well below . the permissible levels. Very high levels of hydrocarbons on top of the Brulin wax container necessitates a need to communicate with employees to avoid stooping over the container to reduce the risk of excessive exposure. A UCC 016545 2- - considerable level of total hydrocarbon was recorded between the mold and the ventilation system, but not near the operator's station. This is indicative of a good hood performance for volatile hydrocarbons. Hydrogen sulfide concentrations could reach as high as 3.0 ppm at inches away from the freshly cut glass Insulation material. This situation would not result in over exposures of employees who normaclly work one to two feet away. Please review all of the monitoring results with employees in your shop and if you need any assistance, please feel free to give me a call at extension 3750. Very truly yours, MAP rep Attachments (3) Manhar A. 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