Construction of Recharge pit for Rain Water Harvesting at GPS, Haddo under Chatham Section , SD-II, PBND, APWD, Port Blair (Re-call).

Amount

Making recharge pit 2.5m diameter 2.3 metre deep filling with 1st layer of stone boulder 5-20 cm, 2nd layer of Gravels 5-10cm and 3rd layer of course sand 1.5-2mm of depth each layer 0.60Mtr. Deep i/c earth work excavation etc as per the direction of Engineer-in-charge

Providing cement concrete surface drain including earth work in excavation 10cm thick base concrete and 23cm thick side walling with 1:3:6 (1 cement 3 sand : 6 graded stone agg. 40mm nominal size) finishing with 1:4 (1 cement : 4 sand) including floating coat of neat cement inlcuding drain and its top and exposed surface including earthwork in excavation and disposal of surplus earth etc., complete.

Construction of cement concrete Chamber 100x90x40 cm with 20cm thick wall in 1:2:4 mix (1 cement : 2 coarse sand : 4 graded stone aggregate 12.5 mm nominal size) with open base and covered with perforated reinforced cement concrete slab 1:1.5:3 mix (1 cement : 1.5 coarse sand : 3 graded stone aggregate 12.5 mm nomnal size) complete as per standard design.