Your salad without dressing has 636 calories, 12 grams of fat and 7 grams of fiber. The dressing is 113 calories, and 13 grams of fat per 2 tablespoons. And if it's a big salad, there are probably quite a few tablespoons in there.
This website:
http://www.dietfacts.com/list.asp?brand=saladworks
Seems to have a lot of the salads in there, but I don't live near a SaladWorks, so I don't know what's in any of the salads. Maybe cross reference this list to the menu and try to make a decision from there. I would go with what the previous poster said, though, about keeping your dressing on the side. Places like that do tend to slather the dressing on. I think there could easily be at least 6T of dressing on a big salad like that...
EDITED!!
Take everything I just said with a grain of salt. I finally got through to the website nutrition area (had to pretend I lived in Tampa Florida -- it won't give you nutrition without knowing your location) and it was completely different. Maybe there are two different sizes? The nutrition I got from the other website was 247 calories which frankly seems too low for the pasta and olives and egg... So I don't know what to tell you. The higher number seems more likely, but I have NO idea what sort of amounts of anything you're getting since I've never seen this place before! (We don't have no fancy schmancy SALAD restaurants in these here parts. Before we eat cheese we make sure to bread it any fry it first...)
So I'd maybe ask the people at SaladWorks.