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An Industrial Hygiene Survey for Lead Hazards at the Minuteman Missile Sites, Great Falls, Montana.
NIOSH 1968 Sep:30 pages
Worker exposures to lead (7439921) (Pb) were surveyed at the United States Air Force Minuteman Missile Site (SIC-9711), Wing 1, Squadron 1, near Great Falls, Montana, from August 12 to 16, 1968, in response to a request from Senator Lee Metcalf. A total of 115 above and below ground workers were medically examined and blood and urine samples were collected for analysis of Pb content. Personal and area air samples were collected and analyzed for Pb content by atomic absorption spectrometry. Underground workers generally had higher blood and urine Pb measurements than above ground workers. Twenty five of the underground workers had over 0.08 milligrams (mg) Pb per 100 grams (g) blood, with values ranging from 0.01 to 0.200mg Pb per 100g blood. Thirty-one of the underground workers had recent or present symptoms of Pb poisoning and slightly elevated blood and urine Pb content. All workers with symptoms did not have high blood Pb content and all workers with high blood Pb content did not have symptoms. Clinical evidence of blood poisoning was not present in any worker. Pb concentrations in 75 air samples collected from seven work sites and mine work crews ranged from 0.00 to 22.58 milligrams per cubic meter (mg/cu m) and averaged from 0.00 to 11.93mg/cu m. Four crews averaged exposures greater than the American Conference of Governmental Industrial Hygienists recommended threshold limit value (TLV) of 0.20mg/cu m. The authors conclude that Pb exposure exists at the Minuteman Site and environmental controls are necessary to improve work conditions. They recommend medical monitoring of workers, worker removal from exposure sites when blood Pb content reaches 0.08mg Pb/100g, ventilation improvements, hygienic training for workers, and protective equipment.
NIOSH-Author; NIOSH-Survey; Field-Study; Region-8; Health-surveys; Workplace-studies; Air-contamination; Work-practices; Control-methods; Occupational-health-programs; Hematology; Metallic-poisons; Heavy-metals; IWS-56-19a;
NTIS Accession No.
Occupational Health Field Station, Occupational Health Program, U.S. Public Health Service, Salt Lake City, Utah, 30 pages, 5 references
Page last reviewed: April 12, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division