tender for cleaning of bottom and sides of the service water tanks (oht) in the residential areas thoroughly including cost of consumables such as bleaching powder, brushes etc. labour charges, removing and relaying of cover slabs, lead & lift etc. complete. , cleaning of bottom and sides of ground level water tanks in the residential areas thoroughly including dewatering the dead storage of water, cost of bleaching powder, brushes etc. labour charges, lead & lift etc. complete. , cleaning of manholes, inspection chambers, sewer lines in the residential area including removal of blockage and disposing the sludge away from the site as and when required as directed by the engineer at site including cost of all materials, t&ps, safety appliances and consumables all lead, lift, labour charges etc., complete