Technical Assistance Report No. TA-80-49, Defense Logistics Agency, Headquarters Personnel Support Center, Philadelphia, Pennsylvania.
NIOSH 1980 Jun:5 pages
The air handling machine room and the ventilation system in use at the Defense Logistics Agency (SIC-9711) Health Clinic and Inspector General's Office in Philadelphia, Pennsylvania were evaluated to determine potential exposure to asbestos (1332214). A walk through survey and bulk residue sampling were conducted on April 3 and 25, 1980 at the request of the Agency. Improper removal of asbestos insulation from an old ventilator was identified as a potential source of asbestos contamination; fibers may have entered the new ventilation system and could expose over 5,500 personnel to asbestos within 1 year. Analysis by polarized light and electron microscopy revealed that 10 to 30 percent of the bulk samples were chrysotile- asbestos (12001295), in the form of free fibers and large chunks of material. The current OSHA asbestos exposure standard for an 8 hour time weighted average is 2.0 fibers per cubic centimeter for greater than 5 microns in length, but the authors note that there is no truly safe exposure limit for asbestos. They conclude that a hazard would exist if the new air system at the clinic is put in operation. They recommend a thorough cleaning of the room and the ventilation system, followed by an appropriate air monitoring program.
NIOSH-Author; NIOSH-Technical-Assistance-Report; TA-80-49; Region-3; Hazard-Unconfirmed; Dust-exposure; Fibrous-dusts; Minerals; Asbestos-dust; Risk-factors; Carcinogens; Air-contaminants; Respiratory-protection; Mechanical-ventilation;
Hazard Evaluation and Technical Assistance; Field Studies
NTIS Accession No.
Division of Surveillance, Hazard Evaluations and Field Studies, NIOSH, Cincinnati, Ohio, 5 pages, 5 references