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Health Hazard Evaluation Report: HETA-85-527-1704: Canyon de Chelly National Monument; Chinle, Arizona
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1986/06/01
[PDF-2.64 MB]
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Description:The National Park Service requested appropriate medical follow up for five employees who became ill after exposure to a granular pesticide applied in and around the visitor center at Canyon de Chelly National Monument (SIC-9199), Chinle, Arizona on September 2, 1985, and to determine whether the subsequent decontamination of the center was adequate. On September 8 to 10, 1985, an environmental and medical survey was conducted. Analysis of a bulk sample of the pesticide confirmed the presence of malathion (121755). Air samples contained less than 0.03 micrograms per cubic meter (microg/m3) of air. The OSHA Standard for malathion in the air is 15,000microg/m3. Wipe samples showed malathion concentrations ranging from less than potentially exposed, 18 were surveyed for symptoms and had tests for blood cholinesterase levels; follow up tests were conducted on 14 of the 18 in October 1985 or January 1986. Four employees presented with headaches, nausea, runny nose, and eye or throat irritation. No significant differences were noted for serum cholinesterase levels. Seven days following exposure, RBC cholinesterase levels of exposed employees were significantly lower when compared to follow up levels. The authors conclude that employees were exposed to potentially toxic concentrations of malathion after application of the pesticide. There was no further risk of toxic exposure after the completion of decontamination of the area.
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Pages in Document:18 pdf pages
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Contributor:McConnell, Rob;Fidler, Anne;
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NIOSHTIC Number:00163536
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NTIS Accession Number:PB87-105573
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Citation:Cincinnati, OH: U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control, National Institute for Occupational Safety and Health, HETA 85-527-1704, 1986 Jun; :1-16
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Federal Fiscal Year:1986
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Peer Reviewed:False
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Resource Number:HETA-85-527-1704
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