Cite as: 522 U. S. 329 (1998)
Opinion of the Court
some fee-simple patents before the expiration of the 25-year trust period, but the restrictions on alienation remained in place as of 1904.)
When the Waste District sought a state permit for the landfill, the Yankton Tribe intervened and objected on environmental grounds, arguing that the proposed compacted clay liner was inadequate to prevent leakage. After an administrative hearing in December 1993, the State Board of Minerals and the Environment granted the solid waste permit, finding that South Dakota regulations did not require the installation of the synthetic composite liner the Tribe had requested. The Sixth Judicial Circuit affirmed the Board's decision, and no appeal was taken to the State Supreme Court.
In September 1994, the Tribe filed suit in the Federal District Court for the District of South Dakota to enjoin construction of the landfill, and the Waste District joined South Dakota as a third party so that the State could defend its jurisdiction to grant the permit. The Tribe also sought a declaratory judgment that the permit did not comport with Federal Environmental Protection Agency (EPA) regulations mandating the installation of a composite liner in the landfill. See 40 CFR § 258.40(b) (1997). The District Court held, in accordance with our decision in South Dakota v. Bourland, 508 U. S. 679, 692 (1993), that the Tribe itself could not assert regulatory jurisdiction over the non-Indian activity on fee lands. Furthermore, because the Tribe did not establish that the landfill would compromise the "political integrity, the economic security, or the health or welfare of the tribe," the court concluded that the Tribe could not invoke its inherent sovereignty under the exceptions in Montana v. United States, 450 U. S. 544, 566 (1981). Accordingly, the court declined to enjoin the landfill project, a decision the Tribe does not appeal. The District Court also determined, however, that the 1894 Act did not diminish the exterior boundaries of the reservation as delineated in the 1858
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