as multiple Indigenous groups, First Nations, and Metis organizations in Canada. For example, the Saugeen First Nation voiced its opposition in May 2015. Supporters of the DGR included the U.S. Environmental Protection Agency and the Michigan Department of Environmental Quality stating that they did not object to the project. Additionally, the municipality of Kincardine, and Saugeen Shores Council were in support of the DGR. Saugeen Shores councilors voted 7–1 in support of the DGR and directed the mayor to write to the Canadian Environmental Assessment Agency stating their political support. Former OPG Employees Statements In 2012 a retired Ontario Power Generation research scientist and chemist Frank R. Greening wrote to the review panel stating that OPG has "seriously underestimated, sometimes by factors of more than 100" the radioactivity of material to be buried. Moreover, during the joint panel review hearings of 2014, Dr. Frank Greening questioned OPG's estimates concerning the inventories it plans to bury in the DGR suggesting that the proposed plans may hold much more radioactive waste than originally proposed. Controversies Lack of Research and Precedent for Constructing a DGR in Limestone Since 1978, the CNSC has explored options for safely storing used nuclear waste in granite rock in the Canadian Shield. In 2008, CNSC began investigating sedimentary rock as a suitable geologic formation. While the CNSC website states, "since 1978, the CNSC has been involved in independent and internationally collaborative research focusing on long-term safety issues related to the disposal of radioactive waste and used nuclear fuel in sedimentary rock," their published research indicates that CNSC began researching sedimentary rock as a suitable repository location in 2014. Previous research focused on the feasibility of constructing a DGR facility in the Canadian shield, formed of igneous, not sedimentary rock. The Nuclear Waste Management Organization began its site selection to find a willing community to host a DGR site, "in a suitable rock formation". This is known as a volunteer first" policy, which means that, communities must put themselves forward to host the site, and would get financial compensation." As of 2015, DGRs in Europe, the United States and Asia have been constructed in granite, tonalite, clay, and salt domes. As of 2016, there was a proposed site in Switzerland which may use clay as the geologic formation, however, the project was still in the research stage and site designation phase. There are multiple operational DGR sites worldwide, but