The figures come from energy company reports ordered by the state after a fatal house explosion in Weld County was blamed on a severed gas line.

If approved, the Forest Service plan based on years of data and an extensive review process, could take effect as soon as summer 2018.

Aspen set the 100 percent renewable goal in 2006 as part of its Canary Initiative, a climate action plan aimed at reducing the city’s carbon footprint 30 percent by 2020.

New Mexico sued Colorado in June 2016, saying Colorado should be held responsible for the contamination as well as decades of toxic drainage from other mines.

Some 300 gallons of toxic water are released each minute from the site above the town of Silverton.

In April it appeared the national monument would be among those reviewed by the Interior Department, at the direction of President Donald Trump.

Colorado's top regulator says as long as the rules are followed, “there’s very little risk, very little potential harm of having empty, abandoned, plugged, capped lines in the subsurface.”