Time Machine - how to remove a dead disk from Preferences?

Time Machine Preference pane shows me 3 disks to back up to.  One of these, Drive1 , has not been backed up to for months. It always shows as waiting to backup.  That is because it is dead.  It has been replaced by Drive3.    Preference Pane shows Drive1, Drive2, Drive3.
How can I delete Drive1 from Preference Pane?  It will always give me the Time Machine Error: "the backup drive is not available"
Can't see a way of doing this.
All suggestions appreciated.

Eric, thank you.  That looks exactly like what I want to do.  But .. I can't  see how to do this.
Here's a screen shot of Time Machine Preferences.  I want to delete "Vault1" because I lost the disk 2 months ago.  I can't.
You show an action that I don't have available to me.  My set up is Software  OS X 10.8.2 (12C60)

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