A front end loading shovel (FEL), entered a small water pit when the operator drove over a storm drain cover. This pit was situated along one edge of the yard and was adjoining a storm drain that connects to a nearby stream. The weight of the FEL caused the drain cover to collapse which in-turn caused the FEL to lean at a dangerous angle, presenting the potential of it tipping over.
An investigation established the following root causes;
- Limited all-round visibility – operator failed to see the drain cover under surface water
- Lack of adequate edge protection around water pit
- FEL fitted with standard vision mirrors only - wide angle convex mirrors should have been in stalled as well
- Contracted operator did not possess MPQC card or evidence of competencies concerning the operation of a FEL.