Document 8YGxObzMOVvVm86JBNymdKn5

August 4, 1975 DOW CHEMICAL U.S.A. LOUISIANA DIVISION PLAQUEMINE, LOUISIANA 70764 boa es7-43ji TO ALL LHC #2 EMPLOYEES For your information: As most of you know, we have been taking air samples on each classification for 8 hour periods. These samples were run in the lab for Benzene, Toluene, Xylene, Styrene, and Butadiene 1-3. The results of the samples are: Classification S. S. Outside O.S. Board 0. S. S.O.T. Furnace 0. T. Process 0. T. Janitor Benzene High Low 00 00 00 00 1.03 0 1.62 0 00 Butadiene-1-3 High Low 5.49 ppm 0 1.13 " 0.83 1.1 ppm .07 1.4 " 1.15 2.03 " 1-22 3.40 0.4 0.7 " 0.5 Toluene High Low 00 00 00 00 00 00 00 Styrene High Low 00 00 00 00 00 00 00 Xvlene High 0 0 0 0 0 0 0 Low 0 0 0 0 0 0 0 TWA (time weighted average) - the average amount of material which can be tolerated for an eight - hour work shift 40 hours per week for the lifetime of the employee without causing any adverse health effect. For example, you couiii work in air with 20 ppm Benzene for 4 hours and in an area with 0 Benzene for 4 hours and your TWA would be 10 ppm TWA. TLV (threshold limit value) refer to airbom concentrations of substances and represent conditions under which it is believed nearly all workers may be repeatedly exposed day after day without adverse affect. The T.L.V. for our samples are: Benzene Tolune Xylene Styrene Butadiene 1-3 10 ppm 100 100 100 1000 If II H ft The T.W.A. should not exceed the maximum in the T.L.V DO 0793.''? ("ONFTDFNTTAl ^ WAO/y, AN OPERATING UNIT OF THE DOW CHEMICAL COMPANY L $ LHC #2 Employees cont'd) A# you can see by the samples, we are well within O.S. H.A. requirements. 'j. q. D. Farthing J) JDF/vec O U f^ci. B / Be fo B *= 2. D - / >? A -- A ' 0 /- * A c t, N, t--- A /V/ J / , ..A o t_i ~ A > ^ 5 e> o ^ d /? J6 L A c A/< t Si o A' P - t < A. c 1 K t '- A 4. t 7. i. 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