Investigation, Survey, Design and Execution of Underground Drainage Network in Zone I, Zone II, Zone III and Zone IV of Narsapuram Municipality including construction of Sewers, Manholes and Lifting Stations., Construction of Sewage Treatment Plant (STP) including mechanical and electrification works etc as per design and as per CPHEEO manual of sewerage and relevant IS codes and other Government levies and maintenance of Sewers & STP for 3 Years including defect liability period of 2 years after completion & commissioning (6th call)