According to some witnesses the truck was launching kayaks at the Kiva ramp and the brake was not set. The witnesses stated the submerging of the vehicle caused gasoline and oil to be dispersed into the lake.
The Copper Gazette will follow up on this. We hope to have answers for you soon.
Update: 8-26-14
According to the Sheriff Dept the vehicle had been retrieved from the water and was gone with the driver when officers arrived on scene.