Document NE88ek0yrKpXXEgZeJx2M6yQb

PLAINTIFF'S EXHIBIT ^ TLVs ~ Threshold Limit Values for Chemical Substances and Physical Agents in the Workroom Environment with Intended Changes for 1974 LAM021580 B003188 6113 18437 Substance 3> ppm#> mg/m Vanadium (V2O5), as V Dust............................ C Fume.......................... Vinyl acetate.................. Vinyl benzene, see Sty rene ............................. Vinyl bromide................ ** Vinyl chloride................. Vinylcyanide, see Acrylonitrile............... Vinyl toluene................. Warfarin......................... Wood dust (nonallergenic)........... Xylene (xylol) -- Skin. . Xylidine -- Skin............. Yttrium.......................... Zinc chloride fume....... Zinc oxide fume.............. * Zinc stearate................... Zirconium compounds (as Zr)......................... -- -- 10 -- 250 -- -- 100 -- -- 100 5 -- -- -- -- -- 0.5 0.05 30 -- 1,100 -- -- 480 0.1 5 435 25 1 1 5 E 5 a) Parts of vapor or gas per million parts of contaminated air by volume at 25 C and 760 mm. Hg. pressure. b) Approximate milligrams of substance per cubic meter of air. d) An atmospheric concentration of not more than 0.02 ppm, or personal protec tion may be necessary to avoid headache. e) < 7 iun in diameter. f) As sampled by method that does not collect vapor. Capital letters refer to Appendices. '1974 Addition. "See Notice of Intended Changes. 32 g) According to analytically determined composition. h) For control of general room air, biologic monitoring is essential for personnel control. Radioactivity: For permissible concentra tions of radioisotopes in air, see U.S. De partment of Commerce, National Bureau of Standards Handbook 69, "Maximum Per missible Body Burdens and Maximum Per missible Concentrations of Radionuclides in Air and in Water for Occupational Expo sure," June 5, 1969. Also, see U.S. Depart ment of Commerce National Bureau of Standards, Handbook 59, "Permissible Dose from External Sources of Ionizing Radia tion," September 24, 1954, and addendum of April 15, 1958. A report, Basic Radiation Protection Criteria, published by the Na tional Committee on Radiation Protection, revises and modernizes the concept of the NCRP standards of 1954, 1957 and 1958; obtainable as NCRP Rept. No. 39, P.O. Box 4867, Washington, D.C. 20008. Substance SILICA, Si02 Crystalline Quartz MINERAL DUSTS TLV in mppcf: 300J> % quartz + 10 TLV for respirable dust in mg/m*: 10 mg/m*w % Respirable quartz + 2 33 B0G3189 6113 18438 LAM021581 TLV for "total dust," res pirable and nonrespirable: 30 me/m' % quartz + 3 Cristobalite.........Use one-half the value cal culated from the count or mass formulae for quartz. Tridymite Use one-half the value calculated from formulae for quartz. Silica, fused Use quartz formulae. Amorphous............................................ 20 mppcf0 SILICATES (< 1% quartz) 'Asbestos, all formst Graphite (natural) Mica 'Mineral wool fiber Perlite Portland Cement Soapstone Talc (nonasbcstiform) Talc (fibrous; use Asbestos limit. Tremolite, see Asbestos. 'Tripoli, use respirable** 5 fibers/cc> 5mm in length*1; A1* 15 mppcf 20 mppcf 10 mg/mJ 30 mppcf 30 mppcf 20 mppcf 20 mppcf mass quartz formula COAL DUST (bituminous). 2 mg/m1 (respirable dust frac tion < 5% quartz). If > 5% quartz use respirable mass formula. '1974 Addition. tA more stringent TLV for crocidolite may be required. 34 NUISANCE PARTICULATES (see Appendix E) 30 m.p.p.c.f. or 10 mg/ra*0 of total dust < 1% quartz Conversion factors mppcf X 35.3 = million particles per cubic meter = particles per c.c. i) Millions of particles per cubic foot of air, based on impinger samples counted by light-field technics. j) The percentage of quartz in the formula is the amount determined from airborne samples, except in those instances in which other methods have been shown to be applicable. k) Both concentration and percent quartz for the application of this limit are to be determined from the fraction pass ing a size-selector with the following characteristics: Aerodynamic Diameter (pm) (unit density sphere) <2 2.5 3.5 5.0 10 % passing selector 90 75 50 25 0 l) containing <1% quartz; if quartz con tent >1%, use formulae for quartz. m) Lint free dust as measured by the verticalelutriator, cotton-dust sampler described in the Transactions of the National Con ference on Cotton Dust, J. R. Lynch, pg. 33, May 2, 1970. 35 B0C3190 LAM021582 6113 18439 n) As determined by the membrane filter method at 400-450 X magnification (4 mm objective) phase contrast illumi nation. o) Based on "high volume" sampling. p) "Respirable" dust as defined by the British Medical Research Council Cri teria (1) and as sampled by a device producing equivalent results (2). (1) Hatch, T. E. and Gross, P., Pul monary Deposition and Retention of Inhaled Aerosols, p. 149. Academic Press, New York, New York, 1964. (2) Interim Guide for Respirable Mass Sampling, AIHA Aerosol Technology Committee, AHIA J. SI: 2, 1970, p. 133. 36 NOTICE OF INTENDED CHANGES (for 1974) These substances, with their correspond ing values, comprise those for which either a limit has been proposed for the first time, or for which a change in the "Adopted" listing has been proposed. In both cases, the proposed limits should be considered trial limits that will remain in the listing for a period of at least two years. If, after two years no evidence comes to light that ques tions the appropriateness of the values herein, the values will be reconsidered for the "Adopted" list. Documentation is available for each of these substances. Substance ppma) + Arsenic, inorganic compounds (as As)............. -- +' Benzene--Skin................. 10 + Butane.............................. 600 + n-Butyl alcohol................ 50 + n-Butyl lactate................. 5 + Cadmium dusts & salts... -- C Cadmium oxide fume.... -- + Calcium cyanamide......... -- + Calcium hydroxide.......... -- + Captan.............................. -- + Carbofuran....................... -- Carbon tetrabromide....... 0.1 Catechol (Pyrocatechol).. 1 Cesium hydroxide............ -- Chlorodifluoromethane... 1000 Chlorpyrifos (Dursban) --Skin........................... -- o-Chlorostyrene............... 50 mg/m33 *> 0.25 30 1,450 150 25 0.05 0.05 0.5 2 5 0.10 1.4 4.5 2 3500 0.2 285 Capital letters refer to Appendices. + 1974 Revision or Addition. 37 B0CG191 LAM021583 6113 18440