Letter To Editor Predicted Colorado EPA Spill 1 Week Before Catastrophe

SILVERTON, CO - AUGUST 11: Three settling ponds are used at Cement Creek, which was flooded with millions of gallons of mining wastewater, on August 11, 2015 in Silverton, Colorado. The Environmental Protection Agency uses settling ponds to reduce the acidity of mining wastewater so that it carries fewer heavy metals. (Photo by Theo Stroomer/Getty Images)