Tender For corrigendum : operation and 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 and uttar roypur w/s scheme .... - 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 supply scheme for arsenic affected areas of south 24-pgs. district under south 24-pgns. w/s division-i, phe dte. (for 01 year)