Water flows through a series of retention ponds built to contain and filter out heavy metals and chemicals from the Gold King mine wastewater accident, in the spillway about 1/4 mile downstream from the mine, outside Silverton, Colo., Wednesday, Aug. 12, 2015.

EPA: Workers At Gold King Mine Were Initially Trapped By Flood

Workers were delayed in issuing a warning about the spill because they were trying to escape it, documents say.

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(Brennan Linsley/AP)

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