Just to add to your information...
Eta Eta was a local before we were chartered as DG. The local was Beta Chi and we received our charter in April of 2001.
Now, as far as which number are we in order of NPC's at the campus, that would be really hard to find because of all the ones that were there and closed throughout the years. Presently we have Phi Mu and Tri-Delta, both of whom were well established when we came around. Long ago we had Tri-Sigma and Alpha Gamma Delta, among others, on campus.
Hope this helps