services | Dredging | mountain lake | TREASURE ISLAND | seaplane lagoon | castro cove 

Treasure Island - Clipper Cove

Treasure Island, CA

Client: Tetra Tech / US Navy

Clipper Cove is located along the Southern side of Treasure Island in San Francisco Bay.  (DMS)  performed clamshell dredging of sediment in Clipper Cove at the former Naval Air Station Treasure Island (TI) to achieve the environmental cleanup goals of the US Navy in support of the Base Closure and Realignment Program. The constituent(s) of concern for this project was lead shot deposited when the area was previously used as a skeet range. The lead shot poses an ecological concern for diving ducks that may consume the lead shot in the cove. Dredged material was deposited in a hopper barge for transport to Naval Air Station Alameda (Alameda Point) where it was offloaded, dewatered, and characterized for disposal.

After the completion of dredging and disposal operations the dredge template will be capped with imported fill. This cap will prevent the future mobilization of lead shot located below the proposed dredge template. Material will be placed in two layers; one layer a filter material and the other an armor material. Material will arrive to Clipper Cove on deck barges and will be placed per the project specifications using the DB Columbia.