Tank 4 is located in stage 4. The tank is approximately 100 feet wide by 100’ long and is 3’8” deep. There is a 30’ x 35’ x 12’ deep section located near the center of the tank (see appendix). Two walls of this tank have a built in over flow weir. The walls behind the weir can be covered with backing material or green screen, to create a seamless horizon.