Abstract: At approximately 6:00 p.m. on October 25, 2007, Employee #1, the foreman, and coworkers, part of a tie-in crew, were lowering a 240 ft long by 42 in. diameter pipe into a trench. Two side-boom tractors were lifing the 68,000 lb steel pipe section, when the front tractor tipped to the left due to loose soil. As the tractor boom overturned, the pipe came loose and rolled, striking Employee #1, who was standing nearby. He sustained injuries that required hospitalization. At the time of the accident the front tractor was going down an incline of about 7 degrees. Each of the side-boom tractors had a lifting capacity of 200,000 lb.