Document jB1a6r1RrwDXrqBE3zrbV5r8p

June 22, 1573 Mr* J. A. Keller, 8upervlaor Ibreonael Services Section General Services Subject: Asbestos fiber Bslssions free Seers Model Bo. 758*17831 Shop Vacuus Cloener As requested. ve evaluated asbestos fiber emissions from the Sears and Roebuck Model Bo. 758.17831 Shop vaewaa cleaner. Shis vacuisa cleaner Is intended to be uaed in lieu of oanpresaed air clean up of asbestos laden broke lining dust on brake linings and druas. The Sears vacuum bas two vacuw notoro each having its ovn discharge. Bach discharge has a paper end a cloth type filter. the contaminant Is deposited in a gallon plastic Ann. Section 1910.53a of the ^federal Register specifies: asbestos fiber In air deter minations to comply vith the provisions of the Occupational Safety and Health Act (OSSA) will be determined by KyjOi phase microscopy and collected at two liters per minute on a 37 * open face type AA Hillipore neafcrane filter or its equivalent, in order to conduct an isokinetic efficiency of tbs vacuum cleaner, it vould have been necessary to deviate drastically from the proscribed sampling rate and from the open faoe filter nods, thereby yielding sample results with no standard to compare the results to. therefore, it vas decided to place the vacuum cleaner In a nail sealed room vith no air changes taking place, and the only air movement in the room vould be that generated by.the discharge of the vacuum cleaner, the zoom chosen held a volume of 880 ft? of air. the vacuum vas placed in the middle of the xocn and than five sampling stations were set up around the zoom equidistant free the vacrnai cleaner* hen poinds of asbestos fiber insulating material vas then vaciuaed up over a If minute period. the current OSSA threshold Limit Value for airborne asbestos fiber is 5 fibers greater than 5 microns la length per milliliter of air vith a dovevard revision to 2 fibers greater than 5 microns In length per milliliter of air scheduled for July 1, 1978. the results of all five air sampleb taken during the test of the vacuum cleaner are veil vithin the 5 fiber and 2 fiber greater than 5 microns in length per ml of air SET's. Me feel that the Sears Model 758.17831 shop vacuum is acceptable from an asbestos fiber emission standpoint, but special precautions vill be required vfaen emptying and cleaning the vacuum. An approved dust respirator for pnerooco* niosls producing dust should be vom uben cleaning the vactnat. the dust In the plastic drum should be removed from the drum vet and then disposed of in properly labeled sealed containers* the filters on discharge ports should also be dis posed of vhen they beoone loaded rather than attempting to clean them, these filters should bo disposed of in properly labeled sealed containers. 8005 0792 SCF-FORD-1083 PRODUCED BY FORD Data Sheet Sari IMtl Bo. 758*17831 Shop Vacuus Owner Abttw aaUaioa 8 Boor* QBHA Aigaetna Threshold Unit TU "" " " " " " Effective July 1, 1976 Sa^le So* 1 n "2 * "3 n "\ n j ObBoaatxetlm of Fibers Greater than 5 Microns la length ptr Milliliter _________ of Air 5 2 06 0.9 0.9 0.7 0.7 V0oo9I goto: Rood sin 880 Ft.3 sanplas taton equidistant from vacuus cleaner. TViatnacntatlco1 MSA >bdel 0 Trap* and Mlllipaae Manfcraae type AA 37 an filter*. 0 A"tyl*; Itaue Microscopy by Ford Scientific Research Optica Section* 01o PRODUCED BY FORD