The US Chemical Safety Board has published a video depicting details of its continuing investigation into a chemical storage tank leak that contaminated the drinking water of up to 300,000 residents in nine West Virginia Counties.
The CSB investigation at Freedom Industries in Charleston found that two small holes in the bottom of the 48,000-gallon tank were caused by corrosion.
This, says the agency, was likely caused by water leaking through holes in the roof and settling on the tank floor.
In the video, high pressure water tools extract metal from the tank for metallurgical analysis.
Watch CSB tank dismantling video:
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