bids are invited for custom bid for services - daily routine maintenance unit per bio tank qty for 3 years 421608 rate including gst , custom bid for services - first chamber evacuation unit per bio tank qty for 3 years 21582 rate including gst , custom bid for services - seven chamber evacuation unit per bio tank qty for 3 years 1199 rate including gst , custom bid for services - attention during secondary maintenance of rakes unit per rake man days qty for 3 years 9386 rate including gst , custom bid for services - relocation of chlorine filter in irdrdo bio digester in lhb coaches unit per coach qty for 3 years 345 rate including gst , custom bid for services - spares to be replaced on need basis rate including gst , custom bid for services - testing reagent on need basis rate including gst , custom bid for services - bonus on reimbursement basis rate including gst