risk and cost contract for supply and stacking of s/m 63-45 mm s/c 22.4 mm s/c 11.2 and fine agg for surf wks csb 7.5 cm thick and s/c 26.5 mm s/c 13.2 mm s/c 11.2 mm s/c 6.7 mm fine agg for bm 7.5 cm and ac 40 mm thick bet km 21.0 to km 25.0 on rd h.