annual repair and maintenance of water supply under sub division no. i nacd, apwd, mayabunder during 2024-25. sw-supplying an stacking of mainland river sand (granular type) for filter media of slow sand filter bed at various water treatment plant under sub division no. i, , supplying & stacking of mainland river sand (granular type) for filter media of slow sand filter bed at lucknow, pokkadera & karmatang water treatment plant unit at mayabunder north andaman with effective size of sand 0.20mm to 0.50mm with uniformity co-efficient of 1.50mm complete i/c transportation from mainland to lucknow, pokkadera & karmatang treatment plant i/c cost of all transportation charges by ship, truck & other means of transport with inclusive of all related tax in or upon to stacking the materials at site complete as per the direction of engineer-in-charge.