First let me say I'm so sorry you have to be going through this. this Dave guy sounds like a real a$$.

By reading this I can tell you are very angry and you have ever right to be but don't let your anger show to much in you complaint.

Stick to facts and try not to piss off management, no blaming management, even if it is their fault. It will get you no where. Showing angry never seem to help in these type of situations.
You don't want to anger the people you are tring to get help from.

Just plain fact ie: Dave sexually comment: (what ever they where) on such and such time and date. etc etc.

What Im saying is make it is short and to the point covering all the areas you can but without judging. Make it as clear as you can, so who ever reads it get only the issues at hand. Making you look like a concerned employee for all and not just a personal thing.

Thats just my opinion though and how I might would handle it.
You know the people you are dealing with better then me so maybe I'm wrong.

Good luck to you.