I've seen their van in Santa Clara, but I can't remember the name of the logo on the side. I think it was from AZ. I did a quick search, but couldn't find what I was looking for.
Could have been american conservation corp? They did some of the trails up in santa clara. If you're looking to volunteer locally, I think the guys at OTE might be building some trail this winter.
Dixie Mountain Bike Trails Association | Expanding and Growing Mountain Biking Opportunities in Southwest Utah
Over the Edge in Hurricane are constantly building/cleaning up trails. They have a facebook page where they post when/where. You could also call them to get more info.
Yeah, I should have called a bike shop.
Thanks for the suggestions.