Desilting of 600 mm dia sewer main from Gold fish common chamber Kokapet STP under Project Division-IV, Goshamahal

Conducting survey to determine sewer alignment. levels, M/H positions. including tracing of alignment, proximity of structures, measurement of exact length between manholes & invert level, position and detail of cross connections & submission of drawings in total 2 Sets on A0 Size, Pre- desilting as well Post - desilting colour CCTV/Photographic survey including pan and Zoom inspection of laterals and defects and submission of video tapes or CD inclusive of colour photographs at every 10m interval printed off video printer to the Engineer in total 2 Sets. The work includes cost of all instruments, material, labour charges, incidental and operational charges using latest technology high power suction machine with vacuum of 4000cum/hr and above (super sucker machine ).carting of silt with leak proof enclosed containers (dumpers) etc., complete as directed by the departmental officer for 600mm dia.

Temporary/permanent plugging and blocking of sewer line. branch connections and diversion of flows. Removing of plugs by various means such as providing MS Plate supported by sand bags, ballon method are any other suitable method to facilitate the desilting of sewer main with the approval of Engineer-in-charge such that there is no sepage from upstream/downstream to proposed stretch of sewer main cleaning including cost of material, labour incidental, operational charges, safety measures using latest technology high power suction machine with vacuum of 4000cum/hr and above (super sucker machine ).carting of silt with leak proof enclosed containers (dumpers) etc., complete as directed by the departmental officer for 600mm dia.

Providing the required diversion of flow by pumping and or by passing and to maintain the sewerage system functioning normal and managing the flow without any surcharging, overflows ete during the De-siliting rehabilitation works of the isolated Sewer main. Sufficient no of pumps with requisite capacity and standby pumps along with a diesel generator and sufficient size of diversion pipe line to disert the flow from upstream manhole to downstream manhole of proposed desiting stretch including taking care of the daily peak flows so that the level in upstream sewer main is not headed up. The work is inclusive of all cost of material, safety equipment, labour and incidental charges and operational charges using latest technology high power suction machine with vacuum of 4000cum hr and above (super sucker machine carting of suit with leak proof enclosed containers dumpers) etc, complete as directed by the departmental officer for 600mm dia.

Loosen, de-silt and thoroughly clean and remove debris and objects such as boulders, bricks etc. bacteriological slimes, roots, encrustations. grease. carbonated deposits, etc and including removing of solidified silt/malba/debris any other material from the sewer main using high power suction machine of vacuum capacity of minimum 4000cum/hr and above including carting with leak proof enclosed containers (dumpers) and disposal of silt/debris/ malba/objects etc to the dumping site upto a maximum distance of 25KMs. The cleaned trunk main surface should be continues slope of invert avoiding hydraulic obstacles and for repairing of | inner surface wherever it is damaged and possibility of future damages to 5 ensure longativity of life time and for conducting CCTV survey. The work of de-silting should be a continuous process and should not be stopped for repairs of desilting / transportation equipments and desilting work shall be carried out by taking all safety precautionary measures and to the satisfaction of the departmental officers. In case of departmental objections after verifying the post CCTV camera inspection. the above procedure of desilting has to be repeated once again to clear the silt in the sewer main to the satisfaction using latest technology high power suction machine with vacuum of 4000cum/hr and above (super sucker machine ).carting of silt with leak proof enclosed containers (dumpers) etc., complete as directed by the departmental officer for 600mm dia.