tender for annual maintenance sewerage scheme dharuhera for the year 2025-26. operation and maintenance of 9.50 mld stp at village kharkhra for dharuhera town including all required items for repairing of non-clog sewage submersible pumping machinery and horizontal pumping machinery of stp and mps at nrp bass road along with its rising main, dharuhera town including all consumable items. repairing of electric installation, street light at stp, operation and maintenance of complete chlorination system ,operation and maintenance of all size of s.w pipe, reinforced cement concrete and hdpe sewer pipe including all required items for reapiring of leakage, desilting of various size sewer line of various type as per yearly action plan apporved by the employer/engineer in charge. operation and maintenance of effluent pumping stations along with hdpe 710 mm o/d rising main up-to final disposal i.e. sahibi river bed and all other works contingent thereto for 2 month.