LASC-GEORGIA operates a large aircraft assembly plant located in Marietta, Georgia. This facility is owned by the U. S. Government and is known as Air Force Plant No. 6. As a part of the assembly operation, various metallic structures have metal finishes applied to them. Some of these parts are plated. A large portion of the parts are aluminum and may receive anodize or conversion coating finishes. Both the plating and aluminum finishing operations generate waste water that must be treated to meet National Pollution Discharge Elimination System (NPDES) discharge limits.