I am flying into IAD and meeting up with colleagues flying in from overseas. My flight arrives around 9AM while theirs is not scheduled to arrive until around 1PM (plus they'll have to clear immigration). I am gold with VS and my first thought was to pass the time there but since I am not flying in on Virgin I will not be able to access their lounge.

Are there any lounges at IAD where I could purchase a day pass?
Failing that any suggestions for a reasonable spot post security to pass some time and get some work done?

Thanks in advance.