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    GUMBI WATER SUPPLY SCHEME UPGRADE The construction of 750m of 200mm diameter HDPE pipeline and 6500m of 200mm diameter PVC-O rising pipeline, with associated valves, chambers and fittings, new floating raw water abstraction pumpstation with two submersible pumps, installation of two new high-lift raw water pumps. Mechanical and Electrical works to upgrade and optimise the Gumbi Water Treatment Works production to 1,5ML/day, new centrifugal pumps and associated civil works, construction of 8500m of 140mm diameter u-PVC rising main to Hlambanyathi and Gumbi Extension. (Closed) | Tender Archive