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The scope of this submission is to assess whether renewing the licences for the Key Lake and McArthur River would cause any undue risk to people and the environment; and to assess whether the applicant (Cameco) is qualified to carry out the licencing sought. [...] The lack of full, documentary disclosure remains a systemic barrier to meaningful participation before the CNSC and is contrary to one of its core statutory objectives, which is to “to disseminate objective scientific, technical and regulatory information to the public concerning the activities of the Commission and the effects, on the environment and on the health and safety of persons.”22 Per Re. [...] However, in 2014, Cameco received approval to expand the volume of the DMTF, increasing the tailings elevation to 505 masl.68 The intervenors submit that the increase in volume of the DMTF in 2014 has increased the risk of tailings leaching into the environment as the volume of the tailings exerts pressure on pit’s barriers: The design changes in the Deilmann In-Pit Tailings Management Facility (D. [...] The intervenors submit that in the spirit of sustainable development, the precautionary principle, and the “polluter pays” principle, the CNSC has an obligation to ensure the environment is adequately protected for present and future generations.93 Due to the age of Key Lake, there were no baseline studies of the local environment and biota conducted prior to mining and milling operations. [...] Therefore, the intervenors submit that it is paramount to the licencing renewal process that there is careful consideration of the site’s remediation and reclamation plans, and how a shifting baseline within the environmental studies of the Key Lake site are influencing the future plans of how the former mining and milling area of Key Lake will integrate into the surrounding environment.