HHE Report No. MHETA-87-173-1882, Jeddo Highland Coal Co., West Pittston, Pennsylvania.
NIOSH 1987 Aug:13 pages
In response to a request from the United Mine Workers of America, District 25, an evaluation was made of working conditions at the J- 44 Strip Mine (Hazelton, Pennsylvania) of the Jeddo Highland Coal Company (SIC-1111), West Pittston, Pennsylvania. Concern was voiced over silica (7631869) dust exposures for highway drill crews during overburden drilling. To reduce operator exposure during this process an enclosed cab was provided for the operator, a rubber skirt was suspended from the deck of the drill to contain the dust, and a collection system conveyed the dust to the ground away from the operator. Respiratory protection was also provided. In hot weather, windows of the cab were left open and respiratory protective devices were seldom used. Quartz (14808607) was the only form of crystalline silica identified. Personal breathing zone samples indicated a time weighted average respirable 8 hour dust exposure of 0.8mg/m3 which exceeded the NIOSH recommended standard of 0.05mg/m3. The mass of airborne dust particles that were 10 micrometer in aerodynamic diameter and below were approximately 69 percent inside the cab and 45 percent outside the cab. The cab did afford about a 76 percent reduction in respirable dust exposure for the operator. The author concludes that a respiratory health hazard did exist for the drill crew. Engineering controls instituted after this survey resulted in reduction in dust levels.
NIOSH-Author; NIOSH-Health-Hazard-Evaluation; NIOSH-Technical-Assistance-Report; MHETA-87-173-1882; Region-3; Hazard-Confirmed; Respirable-dust; Airborne-dusts; Coal-dust; Silica-dusts; Quartz-dust;
Hazard Evaluation and Technical Assistance;
NTIS Accession No.
Division of Respiratory Disease Studies, NIOSH, U.S. Department of Health and Human Services, Morgantown, West Virginia, Report No. MHETA-87-173-1882, 13 pages, 9 references