Technical assistance report no. TA-76-91, Front Royal and Panorama Entrance Stations, Shenandoah National Park, Luray, Virginia.
NIOSH 1976 Nov; :1-11
Worker exposures to carbon-monoxide (630080) (CO), sulfur-dioxide (7446095) (SO2), sulfuric-acid (7664939) (H2SO4), and lead (7439921) were determined at the Front Royal and Panorama Entrance stations of the Shenandoah National Park (SIC-7999) in Luray, Virginia, on August 28 and 29, 1976. The request for the evaluation came from the Assistant Director of Concessions, United States Department of Interior, National Park Service, on behalf of an unspecified number of park rangers exposed to automobile exhaust emissions at the two entrance stations. The time weighted average (TWA) concentration of CO at the Front Royal Station was 29.28 parts per million (ppm), and 26.54ppm at the Panorama Station, compared with the OSHA standard of 50ppm. Breath analysis of rangers for CO and corresponding carboxyhemoglobin, revealed carboxyhemoglobin concentrations ranging from 1.9 to 6.1 percent, compared with the five percent limit recommended by NIOSH. SO2 concentrations ranged from 0.11 to 0.83 milligrams per cubic meter (mg/CuM), compared with the OSHA standard of 5mg/CuM. H2SO4 concentrations were in the range of 0.18 to 1.14mg/CuM, compared with the OSHA standard of 1mg/CuM. Lead exposures ranged from 1.81 to 5.62 micrograms per cubic meter, lower than the proposed OSHA standard of 0.1mg/CuM. The authors recommend positive pressure ventilation systems for the stations and shorter working hours in the stations for the rangers.
NIOSH-Author; NIOSH-Technical-Assistance-Report; TA-76-91; Hazards-Unconfirmed; Region-3; Toxic-gases; Health-surveys; Combustion-products
630-08-0; 7446-09-5; 7664-93-9; 7439-92-1
Hazard Evaluation and Technical Assistance; Field Studies
NTIS Accession No.
Hazard Evaluations and Technical Assistance Branch, NIOSH, Cincinnati, Ohio, 11 pages, 6 references