I'm confused; are you talking about EWR? Looking at the terminal map, I see no gate lower than 70 in the C concourse. Where is C3?
C-1 = C-70's through 90's; C-2 = C100's, 110's; C-3 = C120's and C130's. The "C-3" P Club is the one located in the concourse between the C-2 and C-3 security checkpoints. The only other P Club in Terminal C is near the C-70's gates.