cleaning of terrace water tanks of residential and non-residential buildings at 99 raf bn ; cleaning of terrace / loft water storage tank ( inside surface area ) upto 2000 litre capacity at all heights with coconut brushes, duster etc., removal of silt, rubbish from the tank and cleaning the tank with fresh water disinfecting with bleaching powder @ 0.5gm per litre capacity of tank including marking the date of cleaning on the side of tank body with the help of stencil and paint and disposing of malba all complete as per direction of engineer-in-charge. ( the old date already written on tank should be removed with paint remover or black paint and if date is not written with the stencil or old date is not removed deduction will be made @ rs. 0.10 per litre ) ( if during cleaning any gi fittings or ball cock is damaged that is to be repaired by contractor at his own cost and nothing extra will be paid on this account ) ( dsr 14.75a )