Operation & Maintenance Of Total Distribution System, Pipelines (Ci/Di/Ac/Upvc) Inclusive Of Any Augmentation / Rejuvenation / Special Repair Of Scheme With Repairing Of Valve Chambers At Nandrampur& Uttar Roypur W/S Scheme And Engagement Of Valve Operator, Ex-Serviceman Security Guards (Armed / Un-Armed) At Water Treatment Plant Of Dongaria, Budge-Budge-Ii Block Under Surface Water Based Water Su