A Detroit River island the U.S Army Corps of Engineers built to hold contaminated sediment is targeted for cleanup by another federal agency.

The U.S. Fish and Wildlife Service said Sunday that workers are about to start evaluating Grassy Island to determine how to best contain about 3 million cubic yards of dredged material.

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The agency says work could start as early as Tuesday and will end in November.

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Grassy Island is off the shore in Wyandotte, about 10 miles south-southwest of Detroit. It’s now part of the Detroit River International Wildlife Refuge.

The island originally was a large shoal area with a few low-lying islands. The Army Corps diked up 72 acres in 1959 to hold sediment, mainly from the Rouge River.

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