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State and federal biologists say they are confident they have minimized the invasive species threat posed by a derelict dock that washed ashore last month in Olympic National Park. The concrete and steel dock appears to have drifted across the Pacific Ocean after last year’s tsunami in Japan. But the story is not over yet.

A tsunami debris response team hiked in with scrapers, ratchets and a shovel to a remote Olympic coast beach. National Park Service ecologist Steven Fradkin says the team spent two days cleaning off all the visible sea life clinging to the huge dock, including Japanese seaweeds and barnacles.

“From a marine invasive species perspective, I think that we have largely nullified the invasive threat from the dock.”

Fradkin says the park service is determined to remove the derelict dock from its resting place on a scenic, wilderness beach. It won’t be possible to slice it up and haul away the pieces by truck as was done with another tsunami debris dock near Newport, Oregon last summer.

Fradkin says the options here include towing the hulk to sea with a tugboat or lifting out chopped-up pieces by helicopter.

“This is new territory for everybody,” remarked Allen Pleus, aquatic invasive species coordinator for Washington’s Department of Fish and Wildlife.

A coastal section of Olympic National Park around the beached dock remains closed to the public while the government agencies ponder the next step.

The size and design of the dock which beached on the Olympic coast is virtually identical to the dock remnant that drifted ashore near Newport. Last June, the Japanese consulate confirmed that Newport debris was set adrift by the March 2011 tsunami from the fishing port of Misawa.

U.S. Coast Guard video by Sector Columbia River, Ore. An approximate 30-foot piece of marine debris is spotted and documented by a Coast Guard MH-60 Jayhawk helicopter crew from Sector Columbia River’s Air Station Astoria, Ore., approximately 2.9 miles north of the Hoh River entrance, on a beach just east of Alexander Island, Wash., at approximately 2 p.m., Dec. 18, 2012. Until safety issues are assessed, the location coordinates have been redacted from the footage.

(This was first reported by Northwest News Network.)