I don't charge for stats, but if I did I would probably send out my vacation notice and word it as if your are going to take the stat on the following Monday.

So, this week for example.

"I will be off on vacation from Tuesday July 2nd and will return on Tuesday July 9th. I hope everyone has a wonderful long weekend. Just a reminder that you will not be responsible for payment during my vacation time, however, July 1st is a stat and payment for that day can be added on to the following pay week"

Or however your pay days go. I think you can get away with anything as long as your clear about your intentions.