tender for charges for removal of precast trench cover slabs in drain and relaying the precast trench cover slabs after removal of silt, slush, etc., as directed by the engineer in charge. , removal of silt, slush, ash deposits and other waste materials deposited under water in all drains using baskets / vessels, manvetty and special tools as per site condition etc., complete. , disposal of collected silt, slush, ash deposits and other waste materials away from the site, rate including cost of labour, lead, lift, tools and tackles, transporting by tractor, loading and unloading as directed by the engineer in charge, etc., complete.