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Occupational Safety and Health Administration OSHA

Accident Report Detail

Accident: 201179595 - Employee Is Injured When Excavation Collapses

Accident: 201179595 -- Report ID: 0950621 -- Event Date: 06/13/2006
InspectionOpen DateSICEstablishment Name
30936931206/14/20061794Capital Concrete Breaking & Excavating Inc.
At approximately 9:30 a.m. on June 13, 2006, Employee #1, an equipment operator, was operating a backhoe to excavate a wall. After excavating an area measuring 7 feet deep by 22 feet long by 21 feet wide, Employee #1 exited the backhoe and entered the excavation area to do some hand grading in order to better expose a previously buried conduit. The soil of the excavation was made up of silt and sand with embedded rock. The embedded rock had been previously excavated. In addition, the soil was wet due to rainy conditions. As Employee #1 was hand digging in the excavated trench, a large rock became dislodged and struck him. Loose material then caved in around Employee #1 and the rock. Employee #1 was taken to Tahoe Truckee Hospital, where he was hospitalized and treated for fractures to both of his hip sockets. The accident investigation determined that a compilation of the soil conditions, rainy weather, and vibrations caused by the large excavator working nearby, were the root cause of the cave in. Employee #1 had been instructed by his employer not to enter the excavated area.
Keywords: fracture, collapse, work rules, equipment operator, construction, slippery surface, struck by, unstable soil, backhoe, hip
End Use Proj Type Proj Cost Stories NonBldgHt Fatality
Sewer/water treatment plant New project or new addition $250,000 to $500,000
Employee # Inspection Age Sex Degree Nature Occupation
1 309369312 Hospitalized injury Fracture Construction trades, n.e.c.

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