An employee was loading lumber into a dry kiln. There were 4x4 timbers on the ground for the units of lumber to be stacked on. A forklift brought in lumber and one of the 4x4's moved. When the forklift backed out, the employee went between the stacks of lumber to properly position the 4x4 timber. The forklift driver came into the kiln area with a load and the employee was caught between two stacks of lumber, suffering transverse fractures to the right-side L1-L5 vertebrae.