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EPA Administrator Gina McCarthy visits with Mac McLennan, of Minnkota Power Cooperative, left, and Paul Sukut, of Basin Electric Power Cooperative, during an event Friday at Dakota Gasification Synfuels Plant in Beulah, N.D. Friday, Feb. 28, 2014. McCarthy traveled to the state at the invitation of Democratic U.S. Sen. Heidi Heitkamp of North Dakota, who served as a member of the board of directors at the synthetic natural gas plant in Beulah until she was elected senator in 2012. (AP Photo/Kevin Cederstrom)

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EPA Administrator Gina McCarthy discusses proposed regulations with coal industry leaders during an event Friday at Dakota Gasification Synfuels Plant in Beulah, N.D. Friday, Feb. 28, 2014. McCarthy traveled to the state at the invitation of Democratic U.S. Sen. Heidi Heitkamp of North Dakota, who served as a member of the board of directors at the synthetic natural gas plant in Beulah until she was elected senator in 2012. (AP Photo/Kevin Cederstrom)

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EPA Administrator Gina McCarthy discusses proposed regulations with coal industry leaders during an event Friday at Dakota Gasification Synfuels Plant in Beulah, N.D. Friday, Feb. 28, 2014. McCarthy traveled to the state at the invitation of Democratic U.S. Sen. Heidi Heitkamp of North Dakota, who served as a member of the board of directors at the synthetic natural gas plant in Beulah until she was elected senator in 2012. (AP Photo/Kevin Cederstrom)

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This Friday, Feb. 28, 2014 photo shows the Dakota Gasification Synfuels Plant in Beulah, N.D. EPA Administrator Gina McCarthy discussed proposed regulations with coal industry leaders during an event at the plant. McCarthy traveled to the state at the invitation of Democratic U.S. Sen. Heidi Heitkamp of North Dakota, who served as a member of the board of directors at the synthetic natural gas plant in Beulah until she was elected senator in 2012. (AP Photo/Kevin Cederstrom)

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EPA Administrator Gina McCarthy discusses proposed regulations with coal industry leaders during an event Friday at Dakota Gasification Synfuels Plant in Beulah, N.D. Friday, Feb. 28, 2014. McCarthy traveled to the state at the invitation of Democratic U.S. Sen. Heidi Heitkamp of North Dakota, who served as a member of the board of directors at the synthetic natural gas plant in Beulah until she was elected senator in 2012. (AP Photo/Kevin Cederstrom)

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EPA Administrator Gina McCarthy discusses proposed regulations with coal industry leaders during an event Friday at Dakota Gasification Synfuels Plant in Beulah, N.D. Friday, Feb. 28, 2014. McCarthy traveled to the state at the invitation of Democratic U.S. Sen. Heidi Heitkamp of North Dakota, left, who served as a member of the board of directors at the synthetic natural gas plant in Beulah until she was elected senator in 2012. (AP Photo/Kevin Cederstrom)

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FILE - In this Feb. 19, 2013 file photo, Sen. Ron Wyden, D-Ore., center, tours the Hanford Nuclear Reservation in Richland, Wash. Documents obtained by the Associated Press show that there are “significant construction flaws” in some newer, double-walled storage tanks at the nuclear waste complex. In a letter to Energy Secretary Ernest Moniz Friday, Feb. 28, 2014, Wyden called for better management of Hanford by the Dept. of Energy. (AP Photo/The Oregonian, Jamie Francis, file)