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abutment aggregate air-entraining agent approximately average backfill Bacon siphon Bacon tunnel Bailey bridge basalt batching plant bedrock borrow area borrow pit bottom bridge cement channel Columbia Basin project compacted completed concrete lining concrete placed construction contract contractor cubic feet cubic yards curing compound cutoff trench cutoff wall depth discharge downstream dragline drilling Dry Falls dumped embankment excavation feet long feet per second Figure fill finishing forms foundation gate chamber grade Grand Coulee Grand Coulee Dam gravel grout hauled holes inches inlet inspector installed interflow zones invert irrigation jumbo layer located Long Lake Dam Long Lake headworks Main canal material maximum miles mixer mixing Northern Pacific railroad O'Sullivan Dam operations order for changes outlet portal percent piezometer pipe placement pothole Potholes reservoir pumped rock sand schedule screed shaft side slopes slip-form specifications spillway station stockpiles structure tests Trail Lake transition trashrack trucks tunnel lining upstream water-cement ratio