Boeing submits plans to state to clean up contaminated soil, groundwater at Renton plant

Contaminated soil and groundwater at The Boeing Co.'s Renton plant would be cleaned up under technical plans Boeing submitted to the Washington Department of Ecology.

Ecology seeks public comment on the proposal, called an engineering design report, through Sept. 29, 2014. The report follows up on a cleanup plan approved by Ecology last year.

Boeing would perform cleanup at 12 locations, three of them on land leased at Renton Municipal Airport, according to a press release from the ecology department. Contaminants include residues of solvents and petroleum products from leaks and spills over many years.

The company began assembling airplanes at the site in 1941. Several cleanup studies have been performed on the property on the south shore of Lake Washington and across the Cedar River from the Renton airport. Several interim cleanup projects were done over the past 18 years to prevent contaminants from reaching the lake and river and to protect public and employee safety and health.

In the final cleanup, Boeing plans to:

Extract and treat vapor released into the soil by spills or from contaminated groundwater.

Inject substances into contaminated groundwater that enhance the natural biological activity of microorganisms that consume and remove the contaminants.

The work will begin right after Ecology approval, anticipated later this year. The cleanup areas will then be subject to long-term monitoring, periodic reviews by Ecology and property use restrictions.

The draft report includes detailed construction plans, specifications, and operation and maintenance plans to carry out the cleanup. The report and related documents are available at:

Ecology’s website. Scroll to Boeing Commercial Airplane Group – Renton.

King County Renton Library, 64 Rainier Avenue South, 425-226-6043

· Department of Ecology Northwest Region (by appointment, 425-649-7190), 3190 160th Ave. SE, Bellevue.

People can send comments to Byung Maeng, Ecology site manager, at one of the following addresses:

Department of Ecology, 3190 160th Ave. S.E., Bellevue WA  98008-5452

An Ecology fact sheet provides additional background information.

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