ok, so first, C. Springs is not a sanctuary city. They are just tired of doing ICE's work for them. 
Secondly, it looks like you are ASSUMING that any of these ppl are illegals. 
Yet, these perps could easily be legals here. 

And the border wall will stop NOTHING. If you want to halt it, then we first solve the jobs-going-to-illegals issues (i.e. e-verify), and then once phased in, allow ICE into ALL localities to clean up, and FINALLY, watch the border for minor crossers. Without the wall, they will not dig, or fly, or use submarines, or go on ships, etc. They will simply try to go through the desert where we can spot them easily via drones at 40-50K' up. And it is CHEAP to do that.