The operator of a skid loader had to be rescued Saturday afternoon when his machine fell into a collapsing trench.  The name of the worker and the extent of his injuries haven’t been released.  The Heavy Urban Rescue Team used excavators and heavy chains to pull the skid loader out of the ditch near the Kohl Center.  The man had been stuck inside the machinery for about an hour.  Workers had to stabilize the area around the trench to avoid a cave-in and also had to clean-up diesel fuel which leaked from the machine.  There was some worry it would ignite, but that danger was eliminated.