tender for construction of bbm rcc chambers for sluice valves at various locations situated in zone 4 - construction of bbm & rccchembers for sluice valvesatvarious locations situated in zone - 4 sl. no. item description 1 excavation for foundation / pipe trenches 2 excavation for foundation / pipe trenches 3 providing and laying in situ cement 4 providing and casting in situ c. c. of 5 steel for rcc paradi 6 providing and constructing b.b.. 7 1.5 x 1.5 m internal size and depth upto 8 providing and supplying in standard 9 lowering, laying and jointing h. d. p. 10 refilling the trenches with selected