tender for 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 buita & nischintapur w/s scheme and engagement of valve operator, ex-serviceman security guards (armed / un-armed) at mograhat-ii, joynagar-i, mograhat-i, joynagar-ii, kulpi block and booster station of sonarpur rural (non kmda area) & booster station baruipur rural (non kmda area) 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)