Sorry Kerri, but when your WS decided to wander his dick in the workplace, losing that job/career is one of the risks that goes along with that behavior.
He needs to either find a new job, transfer to a new department, force her to transfer or otherwise go totally NC with the OW.
If he's not doing 110% for this now then you know where his true priority is, which is not you, the betrayed.
Perhaps serving divorce papers are in order? Or maybe explaining how he has 2 weeks to get that bitch out of his midst else you will report the affair to his superiors AND the OW's husband.
Also, the fact he admitted he knows she and her BS are not "100%" means he's already crossing boundaries and discussing inappropriate topics not related to work. I'm certainly glad he has all this time to laugh, chat and get intimate with his whore about her rocky marriage instead of minimal contact and work-related discussions only.
You might want to pick up a copy of "Not Just Friends" so you can read how inappropriate his boundaries are, ESPECIALLY after an affair.
From all of the above, I'd be plastic bagging his shit and starting to make demands. His head is up his own ass, and from the sounds of it, is still up his whores ass as well. ACTIONS... not words.
Good luck to you!