A two-person underground electrical crew had just finished installing an empty electrical conduit and were completing final tasks for the day. These tasks included measuring needed wire lengths for installation into the new conduit and backfilling completed excavations. The injured employee was using a measuring wheel to measure from a tie-in hole to a nearby pedestal and the other employee was using a mini excavator to backfill the area around a newly installed pedestal. The excavator backed into the injured employee's lower left leg, breaking it.