The Ninth Circuit denied an environmental group's petition to review EPA's approval of a Montana SIP revision. The group argued that the approval was arbitrary and capricious because Montana's Department of Environmental Quality interpreted one of the SIP's provisions less stringently than the CAA a...

The D.C. Circuit vacated EPA's rule delaying the 2017 Chemical Disaster Rule, which established safety standards for chemical facilities. The Agency argued that it had authority under CAA §112 to delay the effective date of the Rule beyond the ninety-day limit set forth in CAA §307 because ninety ...

A district court ordered the State Department to supplement its 2014 EIS for a cross-border oil pipeline, known as Keystone XL, to consider the pipeline company's alternative route that was approved for the project. Environmental groups argued that the agency violated NEPA by failing to revisit its ...

The Ninth Circuit affirmed in part and reversed in part a district court's summary judgment in favor of the U.S. Forest Service's approval of a site-specific project concerning restoration activities on roughly 80,000 acres in Payette National Forest in Idaho. Environmental groups challenged the app...

A district court granted in part an environmental group's motion for summary judgment to compel EPA to act on its 2016 Plan for the 2008 eight-hour ozone NAAQS adopted by the San Joaquin Valley Air Pollution Control District and granted in part the Agency's motion requesting an extension on the dead...

A district court denied in part environmental groups' motion for summary judgment challenging BLM's and the U.S. Army Corps of Engineers' approval of a project to replace a wooden diversion weir with a concrete dam along the Yellowstone River. The groups argued that the agencies' EIS violated NEPA b...

The D.C. Circuit granted in part a Native American tribe's petition to review NRC's license decision for construction of a uranium mining project in the Black Hills of South Dakota. The tribe, which has historical ties to the proposed project area, argued that the agency failed to comply with NEPA b...

The D.C. Circuit denied an environmental group's petition to review FERC orders authorizing facilities to export natural gas from the United States to Mexico. The group argued that FERC, in addition to exercising jurisdiction over the export facilities at the border, also should have exercised juris...

The D.C. Circuit denied environmental groups' petition to review a 2016 rule that EPA uses to determine whether an event caused by recurring activity is "exceptional" and thus exempt from a state's emissions report. The groups argued that EPA misread the definition of "natural event" under the excep...