Lead < 0.05 mg/M3 Pouring Lead Ditto Ditto 0.05 mg/M3 Wiping tinned bus bars. 11-15-72 (P.M.)

A hazard arises when, over a period of Ume, the azide reacts with copper, lead, brass, or solder in the plumbing to form an accumulation of lead and/or copper aside, NIOSH said.

Not resistant tooiL Sn* Resistant to water end corrosive fluids f which do not attack lead. 200 F - 40 F Rayon, Cellulose Acetate Lacquer Good Good Used as protective braid.

. * ^ Lead Industries Association, Ino.--- M MM Amm Nse VWK N.

While blood lead levels may be required on certain operations, low blood levels cannot be used as Justification for lead-ln-alr results above the established TLV.

The average motor vehicle will require replacement of the brakes after three years of use at which time they will have lost 50 of their weight by abrasion a The dust emitted will contain % of asbestos fibers e Of the wear dust 80 is emitted and 20 is lodged within the system The AAA cluding claims there are 109,000,000 licenced vehicles in90,000,000 passenger vehicles and 19,000,000 trucks IT RESEARCH INSTITUTE 67 ae ee Calculation The total weight of brake linings in use is 100,000,000 ^ 2000 4 = 200,000 Tons The quantity worn off these linings per year follows from the assumptions made in 1 200,000 x X 50 200,000 = Tons as 3 100 6 This wear dust contains % asbestos hence emission is 200,000 200,000 200,000 6 1 2000 See = 100 6 Tons Allowing for the fact that emission is thus 20 is not emitted the total 2000 80 1600 _ _ _* 7 Tons 6 100 6 270 Effect on the Atmosphere There are no facts relating directly to asbestos on '- which one may judge the effecotf these emissions on urban air However there has been a considerable amount of study done on the diffusion of other materials from automobiles particularly lead and carbon monoxide At a recent ACS Symposium in Minneapolis evidence lead emission at 0.01 was presented which placed min Thule Alaska and the 2.5 level for min New York City Next to busy highways a level in excess of 50 gmay well be possible In the light of this data the value of 2 mfor average urban air conditions suggested by GM4 , seems eminently reasonable Considering that 1.25 x 105 tons of lead are emitted in total from automobiles then the following factor is used Avg Conc asbestos in city air from automobiles _ Quantity of asbestos emitted 2 mcity air 105 1.25 1.25 1.25 x 105 tons Pb from cars Applying this figure to the present case and assuming that 200 tons are emitted in city areas then we get that IT RESEARCH INSTITUTE 68 The avg conc 5 200 ^ 1.25 x 10 Se 3.2 x 10-3 m or ...3.2 x m3 A similar result is obtained using the dispersion for carbon monoxide However the values for lead are since it is a particulate emission rather than a gas factor preferred The Significance of This Value The question of whether asbestos containing brake linings constitute a significant source of ambient air background asbestos levels can now be considered Firstly it is pertinent to review the available evidence on asbestos levels in ambient air Perhaps the most date information is reported in a recent paper by Thompson and Mmorga n EPA m0. 5-15 found of the : Their data suggests that values are appropriate to in nonurban sites urban They sites while 0.1 give a figure of 0.01 0.5-15 0.5-15 is to be ng for remote sites with The the California State School of Public Health Department Health Berkeley in collaboration California have tested values ambient of 0.06 mf or air asbestos Their results in remote sites and 3 ng suggest near near a source Nicholson and Rohl of the Mt.

F80-146 (658A) 1971 1971 1971 1971 1971 1971 1971 1971 1971 1971 1971 1971 1971 1971 1971 1971 The Anaconda Company OB Mining Associations 08 National Association of Secondary Material Industry 08 Offshore Technology 08-55 International Copper Research Association 08-55 International Research Association, Inc International Copper Research Association, Inc. - Organization Manual 08-57 International Lead and Zinc Research 08-59 Lead Zinc Producers Committee 08-60 Lead Industries Association, Inc. 08-60 Lead Industries Association - Booklets 08-65 Mining and Metallurgical Society of America, Inc. 08-66 Mining Club 08-66 Mining Club - Southwest 08-76 Northwest Mining Association 08-86 Smelter Contr

No, bl ' January 31, I98O TEE Q5EA CANCER POLICY _r On Friday, January 19, I960, the Occupational Safety & Health.

The lead concentrations equal or exceed the TLV of 0.2 mg/M^.

Carbon tetrachloride Chloroform Cholanthrene, 3-methyl- Chromic acid, calcium salt(1:1) Chromic acid, calcium salt(1:1), dihydrate Chromic acid, chromium(3+) salt(3:2) Chromic acid, dipotassium salt Chromic acid, disodium salt Chromic acid, lead(2+) salt(lil) Chromite .

The atmos pheric levels of lead are expressed in micrograms (fcg) of lead per cubic meter of air and appear in the extreme right column.

Your ability to meet engineering, construction, or operation schedules relies upon our response to your needs--, so it is imperative that we all be aware of vendor delivery schedules. -> Demands for shorter lead times than are reported here, usually require premium prices

n~> -71 -- PLAINTIFF'S EXHIBIT DOW-1558 ST 001(5302 The Locus of Pathogenicity of Asbestos Dust A Theory Paul Gross, MD.

"Environmental Lead and Public Health" is the t-t of our next paper, a subject of vital interest to the lead industry.

Blood Cst Apparatus. ( A )Sulfide trap containing lead acetate cotton. ( B )Blood sample tube.