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HHE Report No. HETA-92-0263-2424, Boise Cascade, Timber and Wood Products Division, Kettle Falls, Washington.

Authors
Esswein-EJ; Shults-R
Source
NIOSH 1994 May:34 pages
NIOSHTIC No.
00221247
Abstract
In response to a confidential request from employees at Boise Cascade, Timber and Wood Products Division (SIC-2436), Kettle Falls, Washington, an evaluation was conducted of exposure to fly ash and smoke emissions from veneer dryers at the facility and around two fluidized bed combustors located adjacent to the site. A case of manganese (7439965) poisoning had been reported in a worker. Bulk samples of residue collected on the inside and outside surfaces of veneer dryers indicated manganese was present in concentrations ranging from 1,900 to 6,600 micrograms per gram (microg/g). Fly ash collected near the fluidized bed combustors ranged in manganese concentration from 3,300 to 5,200microg/g. One sample of a kaolin clay based refractory sand used in a fluidized bed combustor contained 30,000microg/g manganese. Twelve personal breathing zone exposures to respirable dust ranged from 0.09 to 6.7mg/m3. Respirable silica (14808607) concentrations exceeded the NIOSH recommended exposure limit of 0.05mg/m3. The source of manganese was from manganese containing wood ash generated by the combustion of hogging fuel. Bulk samples of sawdust and hogging fuel ranged from 46 parts per million (ppm) for sawdust from peeled timber to 310ppm for predominantly bark sample. The authors conclude that a potential occupational health hazard existed for workers exposed to manganese and silica. The authors recommend specific measures to improve working conditions and health and safety practices at this facility.
Keywords
NIOSH-Author; NIOSH-Health-Hazard-Evaluation; NIOSH-Technical-Assistance-Report; HETA-92-0263-2424; Hazard-Confirmed; Region-10; Combustion-products; Sawmill-workers; Occupational-exposure; Mineral-dusts; Fly-ash;
CAS No.
7439-96-5; 14808-60-7;
Publication Date
19940501
Document Type
Hazard Evaluation and Technical Assistance;
Fiscal Year
1994
NTIS Accession No.
PB94-215647
NTIS Price
A04
Identifying No.
HETA-92-0263-2424
NIOSH Division
DSHEFS;
SIC Code
2436;
Source Name
Hazard Evaluations and Technical Assistance Branch, NIOSH, U.S. Department of Health and Human Services, Cincinnati, Ohio, Report No. HETA-92-0263-2424, 34 pages, 28 references
State
WA; OH;
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