The abovQ facts combined with our conclusions that indicated that an Aroclor 1242 - Aroclor 1248 type product was responsible for the PCB's found in the Agway samples have lead us to suspect re-used - - - paper as a potential source.

He warns that it "may have the effect of minimizing efforts to initiate engineering controls and Could lead to a 1(H)'/. reliance on respirators."

Documentation covering the considerations leading to the adoption of this value may be obtained by request to the Chairman, TLV Committee, American Conference of Governmental Industrial Hygienists, P. 0.

"lead-and zinc were'obtained by Haskel1 Laboratory.P-The mercury analyses were done by Bruce Julin, Industrial~ ahdrBiochemicals Department, .

r JOB CLASSIMMTION Maintenance Clerk Mechanic QC Lab Supervisor QC Technician/Days QC Technician/Shift Monitoring Analyst, Boiler Lead Operator * Boiler Operator Pilot Plant Croup Leader Pilot Plant Engineer rEN 4640 ' Weolc Of: qfo - <=) j 7(7^ 'wr Personnel Exposure, ppm VCM Week Oi: 9- & 7?

., per cent by weight Poly(vinyl chloride), per cent by weight Lead, ppm.

The Michigan State House of Representatives passed, by a 101-2 vole, a bill which will even tually halt manufacturers' aalee of PCBs for uses that state offi cials say would lead to water pol lution.

{garbled)............. allowed and caused PCB to be released into a stream that leads directly into the Coosa River."

Kehoe: As you have seen from Katharine Boucot1s letter of July 6 she has forwarded to me several manuscripts from the International Lead Conference.

He warns (hat it "may have the effect of minimizing efforts to initiate engineering controls and could lead to a 100a reliance on respirators."

The similarity in the structure of the compounds leads one to expect that their occurrence in the environment might be related also.

If the temporary standard should lead to a Carcinogen Standard, a medical surveillance requirement would probably be included as it was for the 14 Carcinogen Standards promulgated cn January 29, 1974.

Experiments by Westinghouse Air Brake have shown convert that the heat of brake application does not all fiber in the brake s1htoeistorealneaasmeodrpthooutshemaitnmeroasl- but that approximately phere as asbestos fiber 3 The United Transport Union believes that operating trainmen are being exposed to fibers releasetdhefrom has been conveyed overheated borfaTkreansshpooerstaatnidonhatvoedreetqeuremsitneedif asbestos- Department free brake shoes can be provided This union concern to WABCO and they have recommended to us the development development and production production of an asbestos- free brake shoe 4 There is a large potential market 2.0N for composition brake shoes in subway use I understand the mass transit systems in New York City and Atlanta have mandated an asbestos shoe is 3 Our competition Abex Corp. presently extensively advertisi~ advertisi~ major producing marketing and and lead free composition A COPY an asbestos of their advertisement is attached ' [; . qL.

I believe there will be added lead, arsenic, selenium, chromates, manganese, some nickel compounds, chlorine, sulfur dioxide, phosphine, arsine, nitrogen dioxide and various organic compounds along with other materials that I have overlooked.

Wasinuth, Jr. which seems to aiso agree with the lead being takenby Johns-Manville Corporation.