Ok. Go to the Northern Slurries (from Jefferson's base). You don't need the Dreamweaver to see it, so don't worry about that. Start traveling I would say North East. (North being up, south being down.) Soon, you will come to a little alcove. Go inside; there is the entrance and Jefferson.
If you run into a research station with two cacti next to it, you've gone too far north. travel to the right a little. There's pretty much no way to go too far right; just follow the curve of the wall as it leads toward the alcove. Hope this helps!
P.S. @May_Otterview You need to put a specific meeting time. Lourdes is not yet a member. Plus, I would prefer that you would ALWAYS put specific meeting times.