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Report of the Free Silica and Noise Hazard to Workers in Sand and Gravel Crushers and Hot Mix Plants.

PB82104456

Publication Date	1969
Personal Author	Curtis, E. H.
Page Count	16
Abstract	Worker exposures to dust and noise were surveyed at 22 gravel crushing and hot mix facilities in Idaho, New Mexico and Oregon during 1968 to 1969. The companies employed a total of 118 workers. Free silica (7631869) concentrations ranged from 0.2 to 59 percent. Personal air samples contained up to 108 milligrams per cubic meter of free silica. Noise levels were 90 to 105 decibels, and the maximum daily exposure was 1 to 8 hours. Forty three percent of the workers at the dry run crushers and 67 percent of the workers in the hot mix areas that did not have emission controls were exposed to twice the threshold limit values of silica and to excessive amounts of noise. The author recommends that hot mix and crusher facility workers wear ear muffs or plugs, and that dry crusher and hot mix facility workers wear approved free silica dust masks. Workers should be given periodic chest X-ray and audiometric examinations. Crusher operations should be water washed, and all heavy equipment and dozer operation workers should be required to wear ear protective devices.
Keywords	Environmental surveys Industrial medicine Silicon dioxide Noise pollution Exposure Toxicity Inspection Hazardous materials Toxic substances Occupational safety and health CAS 7631-86-9
Source Agency	National Institute for Occupational Safety and Health
NTIS Subject Category	57U - Public Health & Industrial Medicine 57Y - Toxicology 94D - Job Environment 68G - Environmental Health & Safety
Corporate Authors	Bureau of Occupational Safety and Health, Salt Lake City, UT. Western Area Occupational Health Lab.
Document Type	Technical Report
Title Note	Industrywide study.
NTIS Issue Number	198201

Report of the Free Silica and Noise Hazard to Workers in Sand and Gravel Crushers and Hot Mix Plants.

Report of the Free Silica and Noise Hazard to Workers in Sand and Gravel Crushers and Hot Mix Plants.
PB82104456

Publication Date	1969
Personal Author	Curtis, E. H.
Page Count	16
Abstract	Worker exposures to dust and noise were surveyed at 22 gravel crushing and hot mix facilities in Idaho, New Mexico and Oregon during 1968 to 1969. The companies employed a total of 118 workers. Free silica (7631869) concentrations ranged from 0.2 to 59 percent. Personal air samples contained up to 108 milligrams per cubic meter of free silica. Noise levels were 90 to 105 decibels, and the maximum daily exposure was 1 to 8 hours. Forty three percent of the workers at the dry run crushers and 67 percent of the workers in the hot mix areas that did not have emission controls were exposed to twice the threshold limit values of silica and to excessive amounts of noise. The author recommends that hot mix and crusher facility workers wear ear muffs or plugs, and that dry crusher and hot mix facility workers wear approved free silica dust masks. Workers should be given periodic chest X-ray and audiometric examinations. Crusher operations should be water washed, and all heavy equipment and dozer operation workers should be required to wear ear protective devices.
Keywords	Environmental surveys Industrial medicine Silicon dioxide Noise pollution Exposure Toxicity Inspection Hazardous materials Toxic substances Occupational safety and health CAS 7631-86-9
Source Agency	National Institute for Occupational Safety and Health
NTIS Subject Category	57U - Public Health & Industrial Medicine 57Y - Toxicology 94D - Job Environment 68G - Environmental Health & Safety
Corporate Authors	Bureau of Occupational Safety and Health, Salt Lake City, UT. Western Area Occupational Health Lab.
Document Type	Technical Report
Title Note	Industrywide study.
NTIS Issue Number	198201