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Lower Duwamish Waterway Sediment Cleanup Project

Sector: Water Supply and Storage • Location: United States of America (USA)

Source: ENR News

Project
Under Planning

King County is planning to carry out the Lower Duwamish Waterway Sediment Cleanup Project. The project entails excavating more than 193 million gallons of heavily contaminated soil, sand and other sediment from about 99 acres of the river bottom, treating 12 acres under docks and piers, capping another 7 acres near the shore with clean soil, and treating 3 acres through “enhanced natural recovery.

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The project “Lower Duwamish Waterway Sediment Cleanup Project” is an infrastructure initiative in the Water Supply and Storage sector, located in United States of America (USA). Taiyo aggregates data on it from ENR News.

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under planning

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Description

Description

King County is planning to carry out the Lower Duwamish Waterway Sediment Cleanup Project. The project entails excavating more than 193 million gallons of heavily contaminated soil, sand and other sediment from about 99 acres of the river bottom, treating 12 acres under docks and piers, capping another 7 acres near the shore with clean soil, and treating 3 acres through “enhanced natural recovery.” Another 36 acres will undergo “monitored natural recovery” where there will be no dredging or capping. This is a Superfund site. The EPA anticipates issuing its decision in spring 2024, and construction could begin as soon as 2026.

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