Document RpJ5xBQ9YrOYzD68V07RJ4KLV

attach:- >; 7 ;j Chambers Works Mechanical Departnan January 29, 1979 2 DEFENDANT'S EXHIBIT 3 37 _________ PROCEDURE__________ CONTROL OF ASBESTOS DUST MD? 60 Sheet 1 of 7 1. PURPOSE Prescribe methods for controlling, measuring and eliminating exposure to asbestos dust. 2. SCOPS Applicable with airborne-dust originating from asbestos and asbestos-impregnated materials. 3. SOURCE OF EXPOSURE A. All thermal insulation installed prior to 1972 could contain asbestos fibers, including calcium silicate. This could be a source of high exposure during dismantling. ' * B. Other asbestos-bearing materials are possible sources of exposure in varying degrees, for example, heat suits and gloves, laboratory hot pads, transit# board and pipe, asbestos boaird, listing tape, asbestos cloth, Haveg pipe and fittings, etc. C. There are some asbestos-bearing materials used on the Chambers Works in which the fibers are contained and are not a source of airborne dust, for example, braided and molded packing, fibrous adhesive, compressed asbestos gasket material, etc. However, these items will be cataloged and emissions supported by air samples of the work area where they are used. 4. EXPOSURE LIMITS A. Asbestos dust concentration limits are an 8 hour time weighted average (T.W.A.)* of 2 fibers, longer than 5 microns, per cubic centimeter of air and; B. A IS minute T.W.A. of 10 fibers, longer than 5 microns, per cubic centimeter of air. C. Occupational exposure defined is: an 8 hour T.W.A. of more than 0.1 fibers, longer than S microns, per cubic centimeter of air. Average concentration occurring over a period of 8 hours. ?-7Z *0* 1DINT ~ m Ui&t* JUL 9 ol Mi t uewi* 121260 DUP 0904709 SC-DP-05760