The manicured lawns and beautiful brick homes that line the streets of Spring Valley look like those in most affluent District neighborhoods.
But the area looked much different during World War I, when the Army was using it as a testing ground for chemical weapons.On Sunday, visitors on a tour of the neighborhood heard how, 90 years after scientists ended their experiments, the remnants of toxic munitions remain.
Hazardous Waste and History Mix On D.C. Tour
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