wbpur/po/niet-1/19-20/5 rates of different type construction related materials of mgnregs works 5 , buuilding materials supply , loading unloading & stacking sand/ stone aggregate ( less than 40mm nominal size ) , loading unloading & stacking stone aggregate ( above 40mm nominal size ) , loading unloading & stacking lime , moorum , building rubish and similar miscellaneous material , supply of thermocol 12 . 5 mm thick , empty gunny bag , loading , unloading and stacking by manual means ( r . c . c . pipes , c . i . pipes and unreinforced ) cement pipes 600 , 700 , 750 & 800 mm dia , loading , unloading and stacking by manual means ( r . c . c . pipes , c . i . pipes and unreinforced ) cement pipes 900 mm dia , loading , unloading and stacking by manual means ( r . c . c . pipes , c . i . pipes and unreinforced ) cement pipes 1000 , 1100 & 1200 mm dia , loading , unloading and stacking by manual means ( r . c . c . pipes , c . i . pipes and unreinforced ) cement pipes 1400 & 1800 mm dia , portland cement , stone aggregate ( single size ) : 10 mm nominal size , others , stone aggregate ( single size ) :20 mm nominal size , stone aggregate ( single size ) : 10 mm nominal size , stone aggregate ( single size ) : 40 mm nominal size