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Spring Valley used to be a chemical-warfare testing ground; now it's an upscale neighborhood in Northwest D.C. The U.S. Army Corps of Engineers is spending $180 million to clean up the community, and has been at it for almost 20 years. But as environmental reporter Sabri Ben-Achour tells us, there's still work to be done.
[Music: "Fields of Gold" by Hank Marvin from Guitar Man]