tender for laying of gi pipeline 40 mm in parks of sector-12 dwarka ward no. 121/ngz; 1 demolishing cement concrete manually/ by mechanical means including disposal of material within 50 metres lead as per direction of officer in charge 15.2.2 nominal concrete 1:4:8 or leaner mix (i/c equivalent design mix) 2 providing and fixing g.i. pipes complete with g.i. fittings including trenching and refilling etc. external work (18.12.5) 40 mm dia nominal bore 3 painting g.i. pipes and fittings with two coats of anti-corrosive bitumastic paint of approved quality : 18.40.5 40 mm diameter pipe 4 providing and fixing gun metal valve with c.i. wheel of approved quality (screwed end) 40 mm dia nominal bore 5 providing and fixing g.i. union in g.i. pipe including cutting and threading the pipe and making long screws etc. complete (new work) : 18.46.5 40 mm nominal bore 6 providing and filling sand of grading zone v or coarser grade, allround the g.i. pipes in external work : 18.41.5 40 mm diameter pipe 7 providing and laying in position cement concrete of specified grade excluding the cost of centering and shuttering - all work up to plinth level :4.1.2 1:1½:3 (1 cement: 1½ coarse sand (zone-iii) : 3 graded stone aggregate 20 mm nominal size)