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Occupational Safety and Health Administration OSHA

Accident Report Detail

Accident: 201992997 - Employee In Manhole Dies Of Asphyxia From Hydrogen Sulfide

Accident: 201992997 -- Report ID: 0950411 -- Event Date: 08/10/2007
InspectionOpen DateSICEstablishment Name
31135480708/10/20071623Fusion Engineering, Llc
On August 10, 2007, Employee #1 entered a 10.5 ft deep manhole to remove three line plugs and activate the sewer system when he was overcome, probably by hydrogen sulfide. Employee #1 died of asphyxia. The manhole had not been previously entered and was not being monitored for toxicity, oxygen level, or explosive levels. No tripod was in place for emergency retrieval of personnel in the manhole. At the time this this report was written, the probable cause of death had been identified as hydrogen sulfide poisoning, according to the Pima County Forensic Science Department
Keywords: ppe, hydrogen sulfide, work rules, construction, inhalation, chemical vapor, poisoning, manhole, overexposure, chemical
End Use Proj Type Proj Cost Stories NonBldgHt Fatality
Single family or duplex dwelling New project or new addition $250,000 to $500,000 X
Employee # Inspection Age Sex Degree Nature Occupation Construction
1 311354807 Fatality Asphyxia Occupation not reported FallDist:
Cause: Installing culverts and incidental drainage
FatCause: Asphyxiation/inhalation of toxic vapor

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