Trash Day Delay

Thursday is trash day, and what do I see upon coming home but...
lines of uncollected trash.

Thanks to Memorial Day, trash pickup was postponed one day, although apparently no one knew it!

I fail to see the logic in delaying trash pickup due to a Monday holiday, since this service occurs over 5 days each week. One of the following things must be true:
1. Some trash pickup happens on Saturday, thus shifting work from Monday to Saturday, keeping the same number of days off for the workers, who probably receive overtime pay.
2. Workers put in overtime on the four days of the week, probably receiving overtime pay again.
3. Weekly trash pickup can actually be done in 4 days every week, meaning resources are allocated inefficiently every other week.

Anyone know for sure?