Tender For operation & maintenance of total distribution system, pipelines (ci/di/ac/upvc) inclusive of any augmentation / rejuvination / special repair of scheme with repairing of valve chambers at nandarampur & uttar roypur w/s scheme and engagement of valve operator, ex-service man security guards (armed/un-armed) at different blocks and booster station sonarpur kmda & booster station baruipur kmda under surface water based water supply scheme for arsenic affected areas of south 24-pgs. district. [for the period of 12 months]