I once saw that on a ride in your neck of the woods, just outside Graton if I remember correctly. I remember thinking at the time that it was a small portable concrete batch plant.
Brent

found a cell phone before, just called the home number listed and met up with them within an hour. person was super happy to get their phone back. I was pretty young at the time, but i figured if i lost my phone i'd want them to do the same.