A semi carrying Nitrogen overturned in Dairy Hollow. Units made the Headstart Center the staging area. Unit 17 went on into Dairy Hollow and found the truck on its side ; the driver was out and no nitrogen leaking. Firefighters contained a fuel leak with oil dry and placed a bowie in the creek for caution. Engine companies returned to station. Rescue remained at staging while unit 17 was transporting crews to the scene. Firefighters assisted with traffic control until 0930 on the 21st.