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CBS 5 Investigates found radioactive uranium from abandoned mines, leaking into Phoenix's largest drinking water reservoir. That is just one of the findings from our investigation into the toxins left behind at as many 100,000 abandoned mines across the state of Arizona. We collected soil and water samples from ten different locations and had them tested for heavy metals and radioactive materials. Our investigation is ongoing, but so far has prompted the US Forest Service to clean up one of the sites at a cost of more than $300,000, and prompted the state of Arizona to begin an inventory of old mines, in order to figure out which ones pose the most dangers to the environment and human health. http://www.cbs5az.com/story/30211875/cbs-5-investigates-abandoned-mines-polluting-valleys-water-supply?autostart=true http://www.cbs5az.com/story/30211875/cbs-5-investigates-abandoned-mines-polluting-valleys-water-supply?autostart=true