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HHE determination report no. HHE-77-2-404, Johns-Manville Sales Corporation, Lompoc, California,.
Okawa MT; Meyer CR
Cincinnati, OH: U.S. Department of Health, Education, and Welfare, Public Health Service, Centers for Disease Control, National Institute for Occupational Safety and Health, HHE 77-2-404, 1977 Jul; :1-17
A Health Hazard Evaluation investigation was conducted by NIOSH at the diatomaceous earth process (SIC-3295) of the Johns-Manville facility, Lompoc, California, on November 11 and December 21-22, 1976, acting on a request from an authorized employee representative concerning the health hazards of diatomaceous earth dust exposure of the workers. Environmental air samples revealed that employees working in and around diatomaceous earth packing stations and in and around the conveying mechanisms and catwalks were exposed to potentially toxic concentrations of cristobalite containing dust. Employees working at the crushing stations may be exposed to excessive dust levels, but this fact was not conclusive. Mortality data seem to show a pattern of mortality excesses among the Johns- Manville population consistent with those previously documented for diatomaceous earth workers, with the rates of lung cancer and respiratory disease being higher than expected. The medical surveillance program prior to 1973 was not adequate to insure the protection of workers and, while the current program is acceptable, it will need periodic review in order to insure worker health in the future.
NIOSH-Health-Hazard-Evaluation; NIOSH-Author; HHE-77-2-404; Hazard-Unconfirmed; Region-9; Toxicology; Air-sampling; Air-quality-measurement; Industrial-plants; Dust-control; Respiratory-system-disorders; Mineral-dusts; Preventive-medicine; Silicates; Dust-inhalation; Author Keywords: Flux-Calcined Diatomaceous Earth; Dust; Silica; Cristobalite
Field Studies; Health Hazard Evaluation
NTIS Accession No.
National Institute for Occupational Safety and Health
Page last reviewed: December 4, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division