Although it's debatable whether the runs down the main face of Peak 10 are intermediate or advanced, Union is definitely intermediate and is a great way to scope out the Peak 10 blacks without having to actually commit to them. It's also a great way to escape the wind on really bad days as it's not nearly as exposed as the runs going down the main face.

You can access Union from the lower Spitfire entrance. The run is very much a catwalk and quite flat. Union will merge onto Upper Lehman on Peak 9 and you can that trail all the way down to the base of Peak 10.

It's still discouraged to ride up the Falcon Superchair as an intermediate. However, if you want to checkout what Peak 10 is all about and still ski a safe way down, Union is the best way to do so.