On 15 August 2005, a semi-truck trailer leased by Orr Trucking Company (RP) transporting a suspected asphalt emulsion material overturned on Idaho State Highway 55 at Milepost 99. The trailer was reportedly carrying 2100 gallons of material, of which an estimated 1500 gallons spilled onto the roadway. Of this amount, an unknown quantity spilled down the roadway embankment and reached the North Fork Payette River, a navigable water of the US. Initial emergency response was provided by Idaho State Police (ISP), Idaho Transportation Department (ITD), Valley County Sheriff (VCS), and an Idaho Regional Response Team (RRT). EPA was notified of the spill incident by Idaho State Communications and was subsequently requested to provide assistance. On 16 August, EPA and START personnel arrived and promptly integrated into Unified Command with ISP, ITD, Idaho Department of Environmental Quality (IDEQ), and VCS. Due to the RP's inability to fund clean-up activities, EPA also activited its ERRS contractor on 16 August to conduct cleanup activities in concert with state and local law enforcement, transportation, and environmental authorities. All cleanup activities were completed the afternoon of 18 August 2005.
