The question you're really looking to answer is "is it an ice rink?" This is a very common layout format, and can lend towards smaller/awkward pits as you have a forced wall to work around (look at photos of BAE, Boston, NJ and others as an example).
The first place to check is the team list for the event. Most ice rink events cap out in the 40s - and LA is at 60. That's a good sign.
The next place to look is CD Media. Searching under "Los Angeles" yields this great photo:
http://www.chiefdelphi.com/media/photos/31061. As you can see there is lots of horizontal room.
Now, the event info PDF for 2009 has not been released, and the LA regional site does not look updated, so the event hall may be different. If you can confirm it is in the same place, I would say it's safe to assume a 10x10. But always, travel light!
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