Two batches later (from a place a few miles from here where the city has free mulch from trimming trees in city parks) I've spread some around and left the full bags blocking anyone from tumbling into the hole left out there - the water line isn't completely mended yet, it has a slow drip but is on so I have water in the house. My friend will finish the repair tomorrow after work, then we'll finish filling in that hole. And over the next couple of weekends I'll take advantage of all of that disturbed soil and extra dirt and redo more beds. I also have to fix the wire for the Invisible Fence. That got clobbered and a repair at the break doesn't work - it must have broken in two places, and we haven't found the other one yet. I'm sure the company will have a solution.