Running Clubs, Groups, and Partners: Running partner in San Francisco

I like trail running, and do the Headlands as often as I can and occasionally Mt. Tam/Dipsea though my regular run is 7.3 miles from my house and around Lake Merced. I'm looking for a training partner in San Francisco to perhaps do a Boston qualifying CIM (<3:35) next December. I'm a 53 year old recent widower in the southwestern part of the city. Currently I'm doing slightly over 10 minute miles but I think I know get down below 9 with consistent training. As for 8:30, I just don't know...