Cool find. I just love these spiders. They are common around here where I live, as well. Your spider is an "atypical audax" meaning the color and pattern is not the most commonly seen. Check out the link I gave with the Species ID suggestion to see other spiders like yours and get a bit more info on them.
Lat: 38.64, Long: -121.53
Spotted on Oct 7, 2012
Submitted on Oct 10, 2012