Update 2: dissaointment

They visited the site today, and dug up something far more lame:( The following is a copy of the message I recieved: Hi Chris. I visited the site today and found a big piece of granite/rock is the radiation source. I identified radium, a naturally occurring radioactive material. The contact dose rate is 10x background but it drops to 3x background one foot away. I moved your green sign to the back of the pile. You can leave it or collect it, your decision. This rock does not cause any harm to members of the public, so we can leave it there with the pile on top, which acts as shielding. My pictures are the MCA ID and the gamma spectrum for the rock.