In our building, that's a job done by hourlies.
Most p/t sups are not dumb enough to progress any work on a bulk cart. That's an obvious union target. He was either fooling around, setting up his bulk carts(because the hour-lies dont come in on time to do it themselves), retrieve his bulk cart(because the hourlies intentionally take them one at a time, when they can take them all- to extent thier time on the clock) or if the sup is looking for the bulk driver hourlies that disappear, abusing the sort(cigarette breaks in the yard, talking on phone etc)....
The penalty will simply depend on the paperwork. Was he trained, was he suppose to be trained but his boss failed to train, was certification faked, were there employees willing and able to do whatever he was doing, did the p/t exhaust his means, Does he have an injury history, was he specifically instructed to drive, why did the FT Sup permit an uncertified p/t sup to drive etc