The entire Atlantic Carrier Fleet is now home ported in the same city and must cross the same tunnels. They are also about a mile or two downstream of the International Piers. IOW we have planners who are fools. My guess is Norfolk was expanded because at that time it was likely assumed the carrier fleet would be expanded by two or more carriers. That didn't happen. The USSR break up changed things but not anywhere near enough IMO to justify the severity of cuts we've seen.
The current picture at Norfolk:
One carrier in overhaul (based on the West Coast)
One in post-overhaul
One in maintenance
One on deployment
One post-deployed
Therefore, at most 4 carriers in the basin at once right now.
The other carriers are based on the West Coast and Japan.