ero hr contract of housekeeping , operation and maintenance of fire fighting system and garden maintenance including plumbing job for three years at indian oil , ibp house , 34a , nirmal chandra street , kolkata 700 013 , providing and executing of various services as per scope of works under the proposed contract through deployment of minimum competent labours - ( i ) one supervisor-cum-releiver ( skilled ) , ( ii ) nine nos . housekeeping ( semi-skilled ) ( iii ) nine nos fire fighting ( semi-skilled ) , ( iv ) two nos garden maintenance assistant ( semi skilled ) ( v ) two nos serviing tea/coffee/snacks and other jobs ( semi skilled ) ( vi ) one no . plumber ( skilled ) ( inclusive of minimum wages and transport assistance ) . , uniform for all twenty-four workmen . , supplying & providing of sanitary consumable , chemicals for sweeping , cleaning of premises and cleaning of water tanks as per schedule provided in the scope of works . the consumables items are estimated based on existing minimum requirement . , contractors service charges includes workman insurance policy , investment , administration cost , escalation of consumable items , additional manhours cost for tank cleaning & break down , tools & tackles , profit etc .