disposal of existing silt in between km 108.000 to km 110.400 right side, km 110.400 to 112.200 left side, km 113.200 to 114.600 right side, km 114.600 to 115.400 left side, km 114.600 to km 114.800 right side and km 115.400 to km 115.450 right side of m