An expansion work of waste water treatment system at YKK Pakistan (Pvt.) Ltd. The structures include AA & Se Expansion treatment System and New plating WWTS. The structures shall be used as a facility for treatment system for waste water. It comprises of RCC Tank structure supported on ground with projected slab at ground. The top slab and projections at ground are used to support treatment equipment. Total floor area is 1006.41 m2. Roof structure for New plating Structure comprises of structural steel. The Top slab for New plating is designed for maximum of 3 ton/m2 and Ground floor slab is designed for 1 ton/m2 to 3.7 ton/m2. The Top slab for AA and SE Expansion system structure is designed for maximum of 1.5 ton/m2 and Ground floor slab is designed for 0.65 ton/m2 to 5.13 ton/m2. It is also a RCC structure.