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Industrial hygiene survey report of Southern California Rapid Transit District (SCRTD), Division 1 Bus Garage, Los Angeles, CA.
Cincinnati, OH: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control, National Institute for Occupational Safety and Health, IWS 163-2-03, 1991 Jan; :1-37
In an effort to evaluate worker exposure, fire safety, personal protective equipment, and engineering controls during the refueling, repairing and operating of methanol (67561) powered transit buses, an on site visit was made to the Southern California Rapid Transit District (SCRTD) Division 1 bus garage in Los Angeles. Results of data gathered during this visit suggested that inhalation exposures to methanol during bus refueling operations were well controlled by the strict use of a vapor recovery system. Worst case exposures in the fueling area occurred after engine startup when intermittent peak concentrations of up to 233 parts per million (ppm) were recorded. Protective clothing was worn regularly by fuelers. Exposures during bus maintenance were considerably higher, with instantaneous personal exposures up to 630ppm being recorded and area concentrations near 1040ppm. The author recommends modifications to current work practices and processes, improvements in ventilation of the garage area, and regular wearing of suitable protective clothing whenever changing fuel filters on methanol busses.
NIOSH-Author; NIOSH-Survey; Field-Study; IWS-163-2-03; Region-9; Bus-drivers; Maintenance-workers; Automobile-repair-shops; Fuels; Organic-vapors; Alcohols
Field Studies; Industry Wide
NTIS Accession No.
National Institute for Occupational Safety and Health
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division