Rocks Thrown From the Tires of Rolling Stock
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Type:  Lessons Learned

Publisher:  CH2MHill Plateau Remediation Company, Hanford Site (CHPRC)

Published As:  Public

Date: 

Topics:  Occupational Safety and Health, Operations, Work Management/Planning, Heavy Equipment

During soil remediation activities, the 100K Closure Project experienced two near misses resulting from cobbles (large round rocks) being pinched from under the tires of Roll On/Roll Off shuttle trucks and ejected to the side, in the direction of personnel and vehicles. Rocks struck multiple vehicles, and on one occasion, a worker was a nearly struck. Had a rock made contact with personnel, a significant injury could have occurred.

Lesson Learned: Groom, gravel with crushed rock, and compact haul roads. When the aforementioned cannot be performed, safe distances must be maintained between personnel and moving vehicles and equipment. Inspect haul roads to assure that the road surface has not degraded and large rocks have not worked themselves to the surface or fallen from a vehicle on to the road surface.

Recognize changing conditions and evaluate the impact on operations. In one instance, the area of the waste site floor decreased with the increased depth of the excavation, thus reducing the distance between moving vehicles and equipment. In the second instance, a well drilling crew moved in near an unmaintained section of the haul road and the distance from the crew to the haul road was not evaluated.

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