Contra Costa Water District: Chenery Tower Demolition. Work, in general, consists of mobilization and demobilization, equipment staging, the demolition and off-site disposal of the obsolete Chenery Tower (and associated outlet works) at the north embankment of the Mallard Dam, removal and off-site disposal of the adjacent bridge that connects the embankment to the tower, and isolation and abandonment of two parallel, 24-inch concrete pipes beneath the tower that penetrate the dam embankment (including associated excavation). A turbidity curtain shall be deployed around the demolition site to preserve reservoir turbidity outside of the demolition area. Water collected from the two parallel, 24-inch concrete outlet pipes shall be treated with a sediment settlement tank to remove silt prior to being pumped back into the reservoir.

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