Document G5qdE2v5a2YKKZ6ZBNKvNz1Gv

rj _ t'\c C -iu______________________ /. T-Nm 4 Oopjrincnl | | I S._. C._Enders _ _________Plane _Manager_________ fttm-Sam# 4 Cccaf"r D. P. Glazier Industrial Hygiene Stamping & Assembly Employee 4 Indus". Re lar. SuBlcl: ASBESTOS SURVEY Ojic _July 8 , ** Pijn/CM.r 1976_______ CIMS N,,' Trenton Chemical pt.vii C"cC Chrysler CenLer _453- 00-C C;v*s s 417-05-> EXHIBIT CHR-43 On June 29, 1976 the writer obtained a series of thirteen airsamples at four Friction Products work stations in order to calculate the timeweighted average (TWA) airborne asbestos concentration in these areas. The individual results of this survey arc listed on the attached data sheet opposite the corresponding job location. These TWA air samples provide a more accurate index of employee exposure than the air samples of one hour duration obtained during the OSKA required semi-annual survey, because they 'nave been integrated over a considerably longer period of time. The results of this survey indicate that employee exposure to airborne asbestos dust was below the current OSllA permissible exposure level of two fibers per cubic centimeter of air at the four job locations tested. The observed reduction in employee exposure at the Myr oven inspection and Mopar packing operations is believed to be due to improved housekeeping methods and to the strategic location of pedestal fans. Although the pedestal fans are used for man cooling purposes, they can also incidentally reduce employee asbestos exposure if they are positioned properly. However, it should be noted ch.it pedestal fans can also produce strong cross drafts which will over-.wor the lover air velocities which arc generally associated with local exhaust ventilation systems. The removal of loose asbestos fibers from the disc brake shoes at the defuzeer cleaning :-eration has resulted in a significant reduction of employee exposure to airborne asbestos cust at the conforming Matrix washer work stations. It would appear that additional re ductions in employee exposure should also occur at the assorted inspection and assembly 'perations which are performed downstream of this innovative and appar ently effective defuzzer cleaning operation. In regard to tr.e re-ults of. this survey, neither respirators nor additional engineering c;ntrol measures will be required at these f^ur verk stations. Attachment cc: G. D. 3enson J. 0. Cannon J. A. Lardie Lombard D. P. Glazier Industrial Hygienist N. McCallum K. C-. Mitchell W. M. O'Brien G. A. Sactelmeier be: F. A. Burnett Data Sheet Trenton Friction Products June 29, 1976 Location July 1, 1976 OSHA Standard 1) Personal air sample, packing drum brakes into cardboard boxes on the Me par line (time-weighted average concentration) 2) Personal air sample, inspecting the aluminum gasket and packing disc brake shoes after the Myr even bonding opera tion (time-weighted average concentration) 3) Personal air sample, loading disc brake shoes into the west 'ide of the Conforming Matrix washer (tire-weighted average concentration) 4) Personal air sample, leading disc brake shoes into the east side of the Conforming Matrix washer (time-weighted average concentration) Ccncenr.rjti n (fibers tcr cubic centimeter . t air) 2.0 0.3 0.6 0.3 0.7 All determinations of airb-.rno asbestos fiber concentrations were -ade by the Industrial Hygiene Laboratory using the OSJA dictated membrane filter method at a magnification of <*30X with phase contrast illumination.