tender for annual plan-130/26-kariyilpady dwss tank-general civil work - dwss 2 50.10.1:steel work in built up g i tubular ( round, square or rectangular hollow tubes etc.) trusses etc., including cutting, hoisting,fixing in position and applying a priming coat of approved steel primer, including welding and bolted with special shaped washers etc. complete 3 18.48:providing and placing on terrace (at all floor levels) polyethylene water storage tank :isi 12701 marked, with cover and suitable locking arrangement and making necessary holes for inlet, outlet and overflow pipes but without fittings and the base support for tank. 4 4.1.3:providing and laying in position cement concrete of specified grade excluding the cost of centering and shuttering - all work up to plinth level:1:2:4 (cement : 2 coarse sand (zone-iii) : 4 graded stone aggregate 20 mm nominal size)