15 North to 60 West. Exit Garey Ave. Go North on Garey till you hit 2nd. Hang a right. I think there may be a little bit of a faster way but it's kinda difficult to type out. Anyway, try mapquest.com to find the fastest route.
I do not know the time of your interview. Make sure you check the traffic condition that you can get there in time. Normally it takes less than two hours to go to SD from Pomona. You might want to leave earlier, just in case.
Nothing can mess up your interview worse than getting there late. Go luck to you.