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Dock on US northwest is debris from tsunami

OLYMPIA, Washington: The dock that washed ashore on a remote beach in Washington state last month has been confirmed as debris from the March 2011 tsunami in Japan. The state Marine Debris Task Force says it was identified by the Japanese government through photos that showed a fender serial number.
The dock came from the Aomori Prefecture and is similar to the dock that washed ashore last summer in Oregon, also from the tsunami.
The Coast Guard spotted the dock Dec. 18 on a beach.
It’s within a wilderness portion of Olympic National Park and also within the Olympic Coast National Marine Sanctuary and will be removed. A crew has scraped off 400 pounds (181 kilograms) of marine plants and animals in an attempt to prevent any invasive species from taking hold.