How to delete Existing Global Calendars still tied to Project Baseline that is no longer existing?

Hi All,

I am scrubbing our project dbase and came down to the last four calendars excluding the default calendar that cannot be deleted.  I have deleted all the projects in the dbase but has retained the Enterprise Project Structure and other base framework.  When I looked closer as to why these calendars cannot be deleted, I found that they are apparently still being used by some projects.  However, as I said all the projects been deleted.  Then I noticed that it has the auto-suffix "-B1", "-B2", pointing to project baseline.  But how can that be?  If the projects are all gone,