Document YrNYBJQOZqJRkKXqEnaENNJDV

PLAINTIFF'S EXHIBIT Work Environment CBY 3102515 C 000174 LAM022084 Substance SILICA, S1O2 DUSTS TLV Crystalline {Quartz 114808-60-7] TLV in mppcf *1 300" % quartz +10 TLV for respirable dust in mg/m3: 10 mg/m31'________ % Respirable quartz + 2 TLV for "total dust," respirable and nonrespirable: 30 mg/m3 % quartz + 3 {Cristobalite.......... Use one-half the value calculated (14464-46-1 ] from the count or mass formulae for quartz. {Tridymite.............Use one-half the value calculated 115468-32-3 ] from formulae for quartz. {Tripoli................. Use respirable1'' mass quartz for- [1317-95-91 mula {Amorphous (7631-86-9) .................... (20 mppcf'") {Silica, fused [60676-86-0]....... Use quartz formulae. SILICATES and OTHER DUSTS (<1% quartz] Asbestos" Amosite.................. [12172-73-5] Chrysotile................ [12001-29-5] Crocidolite.............. [12001-28-4] Other forms............ c. 0-5 fiber/cc > 5 m01 1(1 length,Ala 2 fibers/cc > 5 ^m in length,Ala 0.2 fiber/cc > 5 ixm in length,Ala 2 fibers/cc > 5 |im in length, Ala {Graphite (natural) [7782-42-51............ 15 mppcf {Mica [12001-26-2]....... 20 mppcf Mineral wool fiber........ 10 mg/m3 {Perlite........................ 30 mppcf {Portland Cement.......... 30 mppcf {Soapstone.................. 20 mppcf Talc (containing no asbestos fibers) [14807-96-6]........... 2 mg/m3, Respirable dust 34 {Talc (fibrous), (use Asbestos limit.) Nuisance particles (see Appendix 0) {(30 mppcf) or 10 mg/m3"" of total dust < 1 % quartz, or, {(5 mg/m3 respirable dust.) Conversion factors. mppcf x 35.3 = Million particles per cubic meter = particles per cc COAL DUST 2 mg/m3 (respirable dust fraction < 5% quartz). {(If > 5% quartz, use respirable mass formula.) h) Millions of particles per cubic foot of air. based on impinger samples counted by light-field technics. i) 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. j) Both concentration and percent quartz for the appli cation of this limit are to be determined from the fraction passing a size-selector with the following characteristics: Aerodynamic Diameter (^m) % passing (unit density sphere) selector ^ 2 90 2.5 75 3.5 50 5.0 25 10 0 k) "Respirable" dust as defined by the British Medical Research Council Criteria,"' and as sampled by a device producing equivalent results.1-' (1) Hatch, T. E. and Gross: Pulmonary Deposition and Retention of Inhaled Aerosols, p. 149. Ac ademic Press, New York, (1964). (2) AIHA Aerosol Technology Committee: Interim Guide for Respirable Mass Sampling. Am. Ind. Hyg. Assoc. J. 31(2):133 (1970). l) As determined by the membrane filter method at 400-4 50X magnification (4 mm objective) phase contrast illumination. {m) containing < 1% quartz: (if quartz content > 1 %, use formulae for quartz.) (See Notice of Intended Ctianges. 35 l.lL'ill1.1 wiujwr I CBY 3102516 C 000175 LAM022085