OLYMPIA — Oil spill clean up work, the result of a 600-gallon transformer spill at the former Olympia brewery in Tumwater, will ramp up Heritage Park.

The effort will wind down in Marathon Park this week, state officials said.

Meanwhile, analytical results indicate that the walking trail at Tumwater Falls Park has been cleaned to meet the state’s cleanup criteria for oil and PCBs.

Restoration work at Tumwater Falls is to begin soon, state Department of Ecology officials said.

Responders have cleaned up seven of 10 identified contaminated areas around Capitol Lake. Ecology officials will continue to sample sediment to ensure clean areas meet state standards, and locate any new pockets of contamination.

Marathon Park’s parking lot has been a staging area for work to remove oil-contaminated sediment from Capitol Lake. The lot has been closed and will be reopened when equipment is moved to Heritage Park.

Spill responders anticipate decommissioning the Marathon Park staging area by the end of next week, according to the state Department of Enterprise Services.

A staging area for the next phase of sediment removal work will be located in Heritage Park. Set up began Monday. Work impact includes:

• Some green space will be fenced off and inaccessible throughout the duration of the cleanup.

• The paved walkway will periodically be closed off to pedestrian traffic. The gravel walkway should be accessible throughout the clean-up efforts.

• There will be some traffic impacts this week as equipment is moved into location. Flaggers will be on site to direct traffic when needed.

• Noise is expected with relocation of equipment and sediment removal, including during evening hours.

• No parking effects are anticipated.

There is no predicted end date for the response at this time.

The state Department of Ecology is overseeing the clean-up effort, which is costing millions of dollars.

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