Well my dad is a dentist and i've worked for him a couple summers, I'd also been to a couple dental seminars w/ him and shadowed a couple of his colleagues. I wasn't sure how many hours exactly it was so i think I just put around 300 on my application; figuring it was a close enough guess. As for GPA it is 3.87 science, 3.76 overall.
On a side note my brother is 1st year OHSU right now as well.
I've heard that UW doesn't give 2ndarys to everyone, but that's just from hearsay, I can't confirm that or anything.