Document DGL5qJRwBN27Exz5Ok2a4kz4n

o SAMPLING DATA SHEET Substance: Asbestos. Standard: 29 CFR 1910.93a (a) of December 7, 1971 8-hour time-weighted average*: 5 fibers per milliliter greater than 5 microns in length. Excursion limit*: 10 fibers per milliliter, up to 15 minutes in an hour for up to 5 hours per 8-hour day. Unprotected or improperly protected worker exposures. Analytical Method: Fibers counted at 400-450 magnification, using phase contrast illumination, with sample mounted in high-viscosity solution of membrane filter material. r\ Samp!ing Equipment: Personal sampling pump plus Millipore type AA filter (37 mm, 0.8 u pore size). Face cap is removed and filter used open face during sampling. Sampling rate: 2 1/m. Sample Size: Minimum period of 15 minutes for evaluation of excursion limit. Several samples of up to 4 hours for evaluation of 8-hour average. Samples with a visible deposit may be too heavy to count. Compare with a clean filter. Heavy concentrations of visible dust in the air (100 to 500 fibers/ml) may require short sampling periods of only 5 minutes, or less. Blanks: With each batch of samples submit two filters which are subjected to exactly the same handling as for the samples except that no air is drawn through them. Label these as blanks. 003793 TX TINER RMC0086357