engagement of 10 nos . of sewer gang beldar for maintenance of sewer system of tilak nagar ac 29 under west-i , engagement of 10 nos . of sewer gang beldar for maintenance of sewer system of tilak nagar ac 29 for removing of complaint of sewer blockage and desalting sewer manholes stores and maintenance of the system tracing and removal of cause of contamination of water desilting of manholes clearance of blockage in sewer line detection and reporting of missing manhole covers . disconnection of unauthorised sewer connections . maintenance of sewer system in field . he is responsible to clean the office premises . add 25 % for working under foul conditions i / c t&p articles , safety equipments and water charges .