Stand Up for California! v. United States Department of the Interior , 879 F.3d 1177 ( 2018 )


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  •  United States Court of Appeals
    FOR THE DISTRICT OF COLUMBIA CIRCUIT
    Argued October 13, 2017            Decided January 12, 2018
    No. 16-5327
    STAND UP FOR CALIFORNIA!, ET AL.,
    APPELLANTS
    PICAYUNE RANCHERIA OF THE CHUKCHANSI INDIANS, A
    FEDERALLY RECOGNIZED INDIAN TRIBE,
    APPELLANT
    v.
    UNITED STATES DEPARTMENT OF THE INTERIOR, ET AL.,
    APPELLEES
    NORTH FORK RANCHERIA OF MONO INDIANS,
    INTERVENOR-APPELLEE
    Consolidated with 16-5328
    Appeals from the United States District Court
    for the District of Columbia
    (No. 1:12-cv-02039)
    Sean M. Sherlock argued the cause for appellants Stand Up
    for California!, et al. With him on the briefs were Todd E.
    Lundell and Benjamin Sharp. Jennifer A. MacLean entered an
    appearance.
    2
    Michael A. Robinson argued the cause for appellant
    Picayune Rancheria of the Chukchansi Indians. With him on
    the briefs was James Qaqundah. Merrill C. Godfrey entered an
    appearance.
    Brian C. Toth, Attorney, U.S. Department of Justice,
    argued the cause for appellees. With him on the brief were
    Jeffrey H. Wood, Acting Assistant Attorney General, and
    Eileen T. McDonough, Attorney. Mary G. Sprague, Attorney,
    entered an appearance.
    Seth P. Waxman argued the cause for intervenor-appellee
    North Fork Rancheria of Mono Indians. With him on the brief
    were Danielle Spinelli, Christopher E. Babbitt, Jonathan A.
    Bressler, John T. Byrnes, and John M. Schultz.
    Before: GARLAND, Chief Judge, TATEL, Circuit Judge, and
    EDWARDS, Senior Circuit Judge.
    Opinion for the Court filed by Circuit Judge TATEL.
    TATEL, Circuit Judge: Following a nearly seven-year
    administrative process, the Interior Department took a tract of
    land into trust for the North Fork Rancheria of Mono Indians,
    a federally recognized Indian tribe based in California, and
    authorized it to operate a casino there. Several entities,
    including nearby community groups and an Indian tribe with a
    competing casino, challenged the Department’s decision in
    United States district court, raising a host of statutory,
    regulatory, and procedural challenges. In a thorough and
    persuasive opinion, the district court granted summary
    judgment to the Department on most claims and dismissed the
    remainder. For the reasons set forth in this opinion, we affirm.
    3
    I.
    Facing high unemployment, inadequate public services,
    and an uncertain revenue stream, the North Fork Rancheria of
    Mono Indians (the “North Fork”) proposed in March 2005 to
    stimulate economic development by building a large-scale
    casino complex. Because the North Fork’s existing land was
    ill-suited to the purpose, it asked the U.S. Department of the
    Interior (the “Department”) to exercise its authority under the
    Indian Reorganization Act (IRA), 
    25 U.S.C. § 5101
     et seq., to
    acquire land “for Indians,” 
    id.
     § 5108, by taking a largely
    undeveloped, 305-acre tract of land in Madera County into trust
    for the tribe. But because a different statute—the Indian
    Gaming Regulatory Act (IGRA), 
    25 U.S.C. § 2701
     et seq.—
    generally prohibits gaming on newly acquired Indian trust land,
    see 
    id.
     § 2719(a), the tribe also asked the Department to
    determine that it qualified for a statutory exception, available
    where the Department “determines [1] that a gaming
    establishment on newly acquired lands would be in the best
    interest of the Indian tribe and its members, and [2] would not
    be detrimental to the surrounding community,” and “[3] the
    Governor of the State in which the gaming activity is to be
    conducted concurs in the [Department’s] determination,” id.
    § 2719(b)(1)(A). The Department made the requested
    determination in September 2011, and California’s governor
    concurred soon after. See U.S. Department of the Interior,
    Secretarial Determination Pursuant to the Indian Gaming
    Regulatory Act for the 305.49-Acre Madera Site in Madera
    County, California, for the North Fork Rancheria of Mono
    Indians 89 (2011) (“IGRA Decision”), Joint Appendix (J.A.)
    3961; Letter from Edmund G. Brown, Jr., Governor of
    California, to Kenneth L. Salazar, U.S. Secretary of the Interior
    (Aug. 30, 2012), J.A. 4014–15.
    Before it could take the land into trust, however, the
    Department had to ensure that the project was consistent with
    4
    the Clean Air Act, 
    42 U.S.C. § 7401
     et seq. That Act provides
    that “[n]o department, agency, or instrumentality of the Federal
    Government shall engage in, support in any way or provide
    financial assistance for, license or permit, or approve, any
    activity which does not conform” to a state’s plan for achieving
    federally mandated air quality standards. 
    Id.
     § 7506(c). Prior to
    making a final “conformity determination,” the agency must
    provide 30-day advance notice to the public, 
    40 C.F.R. § 93.156
    (b), and to tribal and governmental entities specified
    in Environmental Protection Agency (EPA) regulations, see 
    id.
    § 93.155(a). EPA regulations also require that the conformity
    determination be based on “the latest and most accurate
    emission estimation techniques available.” Id. § 93.159(b).
    Having given advance notice to the public and to most—but
    not all—entities expressly entitled to receive it, the Department
    in June 2011 determined that, under California’s latest
    available emissions model, the casino would conform to the
    state’s plan for achieving and maintaining the Clean Air Act’s
    federal air quality standards.
    Based, among other things, on its findings that the
    proposed casino complied with IGRA and the Clean Air Act,
    the Department in November 2012 agreed to take the tract of
    land into trust for the North Fork. See U.S. Department of the
    Interior, Trust Acquisition of the 305.49-Acre Madera Site in
    Madera County, California, for the North Fork Rancheria of
    Mono Indians 1 (2012) (“Trust Decision”), J.A. 4041. Stand
    Up for California!—a nonprofit organization focusing on the
    community effects of gambling—along with five other casino
    opponents (collectively, “Stand Up”), all appellants here, sued
    the Department and the Bureau of Indian Affairs. Another
    appellant, the Picayune Rancheria of the Chukchansi Indians
    (the “Picayune”), which operates a casino expected to compete
    with the North Fork’s, filed a similar suit. The district court
    consolidated the cases and the North Fork intervened as a
    5
    defendant. See Stand Up for California! v. U.S. Department of
    the Interior, 
    204 F. Supp. 3d 212
    , 234 (D.D.C. 2016).
    Stand Up and the Picayune argued that the Department’s
    trust decision violated the IRA, IGRA, the Clean Air Act, and
    the Administrative Procedure Act, 
    5 U.S.C. § 551
     et seq. Most
    directly, they argued that the North Fork is not an Indian tribe
    for which the Department has IRA authority to acquire land.
    They also argued that the acquisition rested on faulty
    predicates, namely, the Department’s determinations that the
    proposed casino complied with the Clean Air Act and qualified
    for the IGRA exception, as well as the California governor’s
    concurrence in the latter determination.
    After the district court remanded the Clean Air Act
    conformity determination without vacatur so that the
    Department could correct its initial failure to notify all entities
    entitled to notice under EPA regulations, see Stand Up for
    California!, 204 F. Supp. 3d at 236, the parties filed cross-
    motions for summary judgment. The district court, Chief Judge
    Howell, denied summary judgment to Stand Up and the
    Picayune, dismissed Stand Up’s claims for failure to join an
    indispensable party—California—insofar as those claims
    challenged the California governor’s concurrence in the
    Department’s IGRA determination, and granted the federal
    defendants and the North Fork summary judgment on all other
    relevant claims. Id. at 323.
    Stand Up and the Picayune now appeal. We review the
    district court’s summary judgment rulings de novo, evaluating
    the administrative record directly and invalidating the
    Department’s actions only if, based on that record, they are
    “arbitrary, capricious, an abuse of discretion, or otherwise not
    in accordance with law.” District Hospital Partners, L.P. v.
    Burwell, 
    786 F.3d 46
    , 54 (D.C. Cir. 2015) (quoting 5 U.S.C.
    6
    § 706(2)). In doing so, we defer to the Department’s reasonable
    interpretation of ambiguities in statutes it is tasked with
    implementing and give “substantial deference” to the
    Department’s “interpretation of its own regulations unless it is
    contrary to the regulation[s’] plain language.” Confederated
    Tribes of Grand Ronde Community of Oregon v. Jewell, 
    830 F.3d 552
    , 558–59 (D.C. Cir. 2016). We accept the
    Department’s factual findings so long as they are supported by
    substantial evidence in the record. See Center for Auto Safety
    v. Federal Highway Administration, 
    956 F.2d 309
    , 313 (D.C.
    Cir. 1992).
    II.
    We begin with Stand Up’s threshold argument that the
    Department lacked statutory authority to take land into trust for
    the North Fork. The IRA provision pursuant to which the
    Department acted, 
    25 U.S.C. § 5108
    , authorizes it to acquire
    land “for Indians,” 
    id.,
     defined as “all persons of Indian descent
    who are members of any recognized Indian tribe” that was
    “under Federal jurisdiction” at the time of the IRA’s 1934
    enactment, 
    id.
     § 5129; see Carcieri v. Salazar, 
    555 U.S. 379
    ,
    395 (2009) (interpreting IRA’s “Indian” definition to include
    only tribes that were under federal jurisdiction in 1934).
    Conceding that the North Fork is now a “recognized Indian
    tribe,” Stand Up Br. 6, Stand Up argues that the Department
    lacked substantial evidence to find, as the IRA requires, that
    the North Fork was a tribe “under Federal jurisdiction” in 1934.
    The Department rested that finding primarily on its earlier
    decision, roughly contemporaneous with the IRA’s enactment,
    to hold a special election at the North Fork’s reservation, the
    North Fork Rancheria, pursuant to an IRA provision
    authorizing the Department to give reservations the
    opportunity to vote within a year of the IRA’s passage on
    whether to accept the statute’s coverage. See 
    25 U.S.C. § 5125
    7
    (authorizing the Department to call special elections). Stand Up
    concedes that such an election, called a section 18 election, is,
    for IRA purposes, sufficient to establish federal jurisdiction
    over a participating tribe. Oral Arg. at 9:33–10:48; cf.
    Confederated Tribes of Grand Ronde, 830 F.3d at 563–64
    (upholding IRA interpretation that finds “federal jurisdiction”
    over a tribe if governmental actions in or before 1934 “reflect
    federal obligations, duties, responsibility for or authority over
    the tribe”). In its view, however, the record here was
    insufficient to establish, broadly, that the participants in the
    North Fork’s section 18 election belonged to any one tribe or,
    more narrowly, that they belonged to a tribe with any
    connection to today’s North Fork Indians. We consider each of
    these arguments in turn.
    A.
    The IRA authorized “reservation[s]” to hold section 18
    elections within a year of its enactment. 
    25 U.S.C. § 5125
    (emphasis added). Stand Up argues that although a section 18
    election can demonstrate that the voters in such an election
    resided on a single reservation falling under federal jurisdiction
    in 1934, it cannot demonstrate that they belonged to a single
    “Indian tribe [then] under Federal jurisdiction,” 
    id.
     § 5129
    (emphasis added), eligible to receive trust land today. This
    argument ignores the IRA’s plain text. The statute provides that
    “[t]he term ‘tribe’ wherever used in this Act shall be construed
    to refer to any Indian tribe, organized band, pueblo, or the
    Indians residing on one reservation.” Id. (emphasis added).
    Because the North Fork Rancheria, eligible to hold a section 18
    election, was a “reservation” at the IRA’s enactment, id.
    § 5125, the voters—whose Indian or resident status Stand Up
    nowhere disputes—were “Indians residing on one reservation”
    at that time and so, by the IRA’s own terms, constituted a
    “tribe,” id. § 5129.
    8
    According to Stand Up, we may not now rely on the IRA’s
    definition of “tribe” because the Department failed to cite it
    when concluding that the North Fork was a tribe subject to
    federal jurisdiction in 1934. But the Department cited the
    section 18 election held “at the [North Fork’s] Reservation” as
    evidence of the North Fork’s 1934 tribal status, Trust Decision
    at 55, J.A. 4095, and nothing suggests that in doing so the
    Department departed from the straightforward textual reading
    it has given the IRA’s “tribe” definition in prior cases. See, e.g.,
    United Auburn Indian Community v. Sacramento Area
    Director, 24 IBIA 33, 41–42 (1993) (agency opinion citing
    IRA’s “tribe” definition in finding section 18 election
    established tribal existence). Although we will “not supply a
    reasoned basis for [an] agency’s action that the agency itself
    has not given,” we may affirm “if the agency’s path may
    reasonably be discerned.” Bowman Transportation, Inc. v.
    Arkansas-Best Freight System, Inc., 
    419 U.S. 281
    , 285–86
    (1974). Here, that path is clear: a section 18 election on a
    reservation establishes that the Indian residents qualify as a
    tribe subject to federal jurisdiction.
    Undaunted, Stand Up points to Department documents
    supposedly establishing that, notwithstanding the IRA’s text,
    residency is distinct from tribal affiliation. Specifically, two
    1934 interpretive opinions by the Department’s Solicitor
    mention that certain reservation residents typically ineligible to
    participate in tribal affairs could nonetheless vote in their
    reservation’s section 18 election and that a tribe split over
    multiple reservations could organize as a single tribe. Cf. 
    25 U.S.C. § 5123
    (a) (allowing a tribe, rather than a reservation,
    “to organize for its common welfare”). Stand Up also cites a
    2013 court filing in which the Department acknowledges that
    some organized tribes lack a designated reservation.
    9
    Of course, such agency statements cannot overcome the
    IRA’s clear text: “the Indians residing on one reservation”
    comprise a “tribe” under the Act. 
    Id.
     § 5129. Besides, the
    materials Stand Up cites are fully consistent with the
    proposition that the residents of a single reservation constitute
    a tribe under the IRA. At most, they suggest that a reservation
    resident might also belong to another tribe that is not
    territorially defined. Nothing suggests that Congress precluded
    the possibility of holding dual tribal identities, one based on
    cultural or genealogical ties and another on residency. Cf. Act
    of Aug. 11, 1964, Pub. L. No. 88-419, 
    78 Stat. 390
    , 391
    (clarifying that a prior statute stripping Indian status from
    certain reservation residents left those affected wholly bereft of
    Indian status only if they were “not members of any other tribe
    or band”). As the district court aptly noted, “nothing in the text
    of [the IRA] requires a tribe” within the meaning of the statute
    “to be ‘single,’ ‘unified,’ or comprised of members of the same
    historically cohesive or ethnographically homogenous tribe.”
    Stand Up for California!, 204 F. Supp. 3d at 289. Stand Up’s
    response—that yoking residency to tribal identity contravenes
    tribal autonomy by artificially lumping heterogeneous
    populations together as tribes—is best addressed to Congress.
    Moreover, beyond the section 18 election, other record
    evidence confirms the North Fork’s longstanding tribal
    existence. Specifically, in 1916, the Department used
    congressionally appropriated funds to buy the North Fork
    Rancheria for the tribe’s use. See Act of June 30, 1913, Pub. L.
    No. 63-4, 
    38 Stat. 77
    , 86 (appropriating funds “[f]or support
    and civilization of Indians in California”). Stand Up insists that
    we may not consider this purchase because the Department
    treated the section 18 election alone as “conclusively
    establish[ing] that the [North Fork] was under Federal
    jurisdiction” in 1934. Trust Decision at 55, J.A. 4095. Stand Up
    misreads the Department’s decision. Although the Department
    10
    treated the election held “at the Tribe’s Reservation” as
    dispositive of the government’s jurisdictional relationship with
    the reservation’s residents, it presupposed that the reservation
    was a “Tribe’s.” 
    Id.
     The source of that presupposition becomes
    clear in the decision’s very next section, where the Department
    characterized the 1916 Rancheria purchase as establishing the
    North Fork’s “tribal land.” 
    Id.
    According to Stand Up, the beneficiary of the Rancheria’s
    purchase was not a cohesive tribal entity, but rather a set of
    diverse Indian groups occupying the geographic North Fork
    region. Ample record evidence, however, including the 1916
    purchase authorization itself, supports the Department’s
    contrary conclusion. See Bethel-Fink Decl. exh. A, ECF
    No. 33-1 at 10 (authorizing purchase of land “for the use of the
    North Fork band of landless Indians”), quoted in Bureau of
    Indian Affairs Decision Package, Administrative Record
    NF_AR_0000776, J.A. 527; Letter from John J. Terrell,
    Special Indian Agent, to Commissioner of Indian Affairs 1
    (Apr. 4, 1916), J.A. 532 (referring to a member “of th[e] band”
    of “the Indians of Northfork and v[i]cinity”); 
    id. at 3
    , J.A. 534
    (“[T]here is likely more than 200 Indians properly belonging to
    the Northfork and v[i]cinity band.”). Nothing more is required.
    See FPL Energy Maine Hydro LLC v. FERC, 
    287 F.3d 1151
    ,
    1160 (D.C. Cir. 2002) (substantial evidence standard “requires
    more than a scintilla, but can be satisfied by something less
    than a preponderance of the evidence”).
    B.
    Stand Up next argues that even if record evidence
    establishes that the North Fork Rancheria’s 1934 residents
    belonged to an identifiable tribe “under Federal jurisdiction,”
    
    25 U.S.C. § 5129
    , the evidence is insufficient to connect the
    present-day North Fork to that historic group. Our examination
    of the North Fork’s history, however, demonstrates that even
    11
    though the tribe has had its ups and downs, substantial record
    evidence supports the Department’s conclusion that today’s
    North Fork traces its roots to the Indians who lived on the
    Rancheria in 1934.
    When the Department purchased the North Fork
    Rancheria in 1916, some 200 Indians lived in the vicinity. By
    1933, the population had dwindled to seven, and by 1955 only
    one adult Indian, Susan Johnson, lived at the Rancheria. Three
    years later, in 1958, Congress passed the California Rancheria
    Act, Pub. L. No. 85-671, 
    72 Stat. 619
     (1958), which ended the
    federal government’s trust relationship with forty-one
    California reservations and Rancherias, among them the North
    Fork Rancheria, see 
    id.
     §§ 1, 9, and effectively divested certain
    residents, including Ms. Johnson, of Indian status, see id.
    § 10(b). But years later, in 1983, as part of a stipulated
    judgment in a case challenging the government’s termination
    of its trust relationship with certain Rancherias, Hardwick v.
    United States, No. C-79-1710-SW (N.D. Cal.), the government
    reversed course, agreeing to “restore[] and confirm[]” Indian
    status for some who had lost it under the California Rancheria
    Act; to “recognize the Indian Tribes, Bands, Communities or
    groups of” seventeen listed Rancherias, including the North
    Fork Rancheria, “as Indian entities with the same status as they
    possessed” prior to the 1958 Act; and to list those entities as
    federally recognized tribes, Stipulation for Entry of Judgment,
    Hardwick, No. C-79-1710-SW, ¶¶ 2–4 (Aug. 3, 1983)
    (“Hardwick Stipulation”), J.A. 549–51.
    Although acknowledging that the Hardwick stipulation
    restored the North Fork to its 1958 status and that it retains that
    status today, Stand Up Reply Br. 11, Stand Up insists that
    nothing in the record establishes that the North Fork had any
    tribal status in 1958 capable of restoration through the
    stipulation. This is incorrect. Substantial record evidence
    12
    supports the Department’s conclusion that the North Fork
    continued to exist in 1958. Most obviously, Congress’s 1958
    decision to terminate the federal trust relationship with the
    North Fork via the California Rancheria Act demonstrates that
    there was in fact a relationship to terminate. Stand Up believes
    that the Act ended the government’s relationship with the
    North Fork Rancheria, not with any tribe. But as explained
    above, under the IRA, the “Indians residing on one reservation”
    are a tribe. 
    25 U.S.C. § 5129
    ; see also Amador County v.
    Salazar, 
    640 F.3d 373
    , 375 (D.C. Cir. 2011) (describing the
    California Rancheria Act as “authoriz[ing] the [Department] to
    terminate the federal trust relationship with several California
    tribes”). Moreover, and again as explained above, substantial
    evidence supports the conclusion that the Rancheria was itself
    purchased for a discernible band of North Fork Indians that
    included, but was not necessarily limited to, the residents of the
    land that became the Rancheria. The fact that only one adult
    member of this band—Ms. Johnson—lived at the Rancheria in
    1958 is as easily attributable to the fact that the Rancheria was
    “poorly located and absolutely worthless as a place to build
    homes on” as it is to tribal dissolution. Lipps-Michaels Survey
    of Landless Nonreservation Indians of California 1919–1920,
    at 50 (July 15, 1920), J.A. 4029.
    Furthermore, the Hardwick stipulation reinstated “the
    Indian Tribes, Bands, Communities or groups of” seventeen
    named Rancherias, including the North Fork, “as Indian
    entities with the same status as they possessed” in 1958.
    Hardwick Stipulation ¶ 4, J.A. 550. Stand Up reads this
    bargained-for provision as a nullity with respect to the North
    Fork. The Department, however, quite reasonably understood
    the provision to establish that the North Fork had a 1958 status
    worth restoring. Stand Up cites a Ninth Circuit decision,
    Williams v. Gover, 
    490 F.3d 785
     (9th Cir. 2007)—in which the
    descendants of a terminated Rancheria’s pre-1958 members
    13
    unsuccessfully challenged the Rancheria’s post-Hardwick
    decision to exclude them from full tribal membership, see 
    id.
    at 787–88—for the proposition that, as Stand Up sees it, “there
    is no inevitable connection between a tribe that emerged from
    the Hardwick Stipulation and those residing on a Rancheria”
    prior to the California Rancheria Act, Stand Up Br. 31. This
    misreads Williams. The Ninth Circuit held only that a reinstated
    tribe retains “power to define membership as it chooses,” even
    if in doing so the tribe elects not to privilege individual Indians’
    pre-1958 tribal ties. Williams, 
    490 F.3d at
    789–90.
    Having failed to undermine the Department’s perfectly
    reasonable reliance on the Hardwick stipulation as evidence
    that the North Fork existed in 1958, Stand Up grasps at isolated
    bits of the record that, in its view, nonetheless compel the
    opposite conclusion. It first points to a Federal Register notice
    terminating Ms. Johnson’s Indian status pursuant to the
    California Rancheria Act and purporting to “affect[] only
    Indians who are not members of any tribe or band of Indians.”
    Notice of Termination of Federal Supervision Over Property
    and Individual Members, 
    31 Fed. Reg. 2911
    , 2911 (Feb. 18,
    1966). According to Stand Up, the notice’s disclaimer means
    that Ms. Johnson—who, as the North Fork Rancheria’s only
    1958 adult Indian inhabitant, belonged to the North Fork tribe
    if such a tribe existed—had no 1958 tribal affiliation. True to
    form, Stand Up misreads the disclaimer. By its own terms, the
    disclaimer was expressly linked to a “provision[] in [a] 1964
    Act” amending the California Rancheria Act, 
    id.,
     and that
    amendment clarified that the original 1958 Act’s provision
    voiding certain residents’ Indian status was meant to apply to
    only those Indians “who [were] not members of any other tribe
    or band of Indians,” Act of Aug. 11, 1964, Pub. L. No. 88-419,
    
    78 Stat. 390
    , 391 (emphasis added). Put simply, the Federal
    Register notice indicates not that Ms. Johnson had been
    unaffiliated prior to 1958, but rather that she would lose Indian
    14
    status thereafter only if she belonged to no tribe other than the
    North Fork.
    Stand Up next cites a 1960 opinion by the Solicitor of the
    Bureau of Indian Affairs quoting a portion of the California
    Rancheria Act’s legislative history that characterizes “the
    groups” occupying the Rancherias subject to the Act as “not
    well defined,” Rancheria Act of August 18, 1958, Department
    of the Interior, Opinions of the Solicitor 1884 (Aug. 1, 1960)
    (“Solicitor Opinion”), J.A. 324, as well as a Senate Report
    stating that the North Fork had “no approved membership roll”
    in 1958, S. Rep. No. 85-1874, at 33 (1958), J.A. 306. Stand Up
    draws the wrong conclusion from the cited legislative history.
    That the Solicitor’s opinion associated the Rancherias with
    groups that were “not well defined” is far less significant than
    that it associated them with “groups,” thereby supporting the
    Department’s conclusion that the North Fork Rancheria was
    connected to an identifiable North Fork tribal entity. Solicitor
    Opinion at 1884, J.A. 324. Likewise, that the North Fork failed
    to keep membership records in 1958 hardly undermines the
    Department’s finding that the tribe existed at that time.
    Finally, Stand Up argues that even if substantial evidence
    establishes the North Fork’s 1958 existence, nothing connects
    the tribe’s 1958 iteration to the voters in the North Fork
    Rancheria’s 1934 section 18 election. Enough is enough! Stand
    Up demands an unnecessary—indeed impossible—
    genealogical exercise. Barring affirmative evidence of tribal
    discontinuity between 1934 and 1958, the Department was
    entitled to rely on the unremarkable assumption that a political
    entity, even as its membership evolves over time, retains its
    essential character.
    15
    III.
    Now joined by the Picayune, Stand Up contends that, even
    if the Department had IRA authority to acquire trust land for
    the North Fork, it could not exercise that authority in
    connection with the North Fork’s proposed casino project
    because the Department’s determinations that the proposal
    complied with IGRA and the Clean Air Act were fatally
    flawed. We disagree.
    A.
    Although IGRA generally bars gaming on newly acquired
    Indian trust land, 
    25 U.S.C. § 2719
    (a), it creates an exception
    where the Department “determines that a gaming establishment
    on newly acquired lands [1] would be in the best interest of the
    Indian tribe and its members, and [2] would not be detrimental
    to the surrounding community,” provided that “[3] the
    Governor of the State in which the gaming activity is to be
    conducted concurs in the [Department’s] determination,” 
    id.
    § 2719(b)(1)(A). In this case, the Department made the
    required determinations, and California’s governor concurred.
    Neither Stand Up nor the Picayune disputes that the first
    of the exception’s requirements—that the proposed casino is in
    the North Fork’s best interests—was satisfied here. Instead,
    they challenge the Department’s finding that “[t]he proposed
    Resort would not be detrimental to the surrounding
    community.” IGRA Decision at 84, J.A. 3956. The Picayune
    also challenges the gubernatorial concurrence as invalid under
    California law.
    Although the former argument requires some discussion,
    we can easily dispose of the latter, as it is twice forfeited. The
    district court concluded that the Picayune, having “nowhere in
    its ample briefing on summary judgment even mention[ed]” the
    gubernatorial concurrence’s supposed invalidity, abandoned
    16
    any challenge to the concurrence. Stand Up for California!,
    204 F. Supp. 3d at 247 n.16. The district court further ruled that
    no such challenge could proceed in any event, as California
    was not a party. See id. at 254. Because the Picyaune
    challenged neither of these independently dispositive findings
    in its opening brief, it has forfeited its opportunity to do so. See
    Russell v. Harman International Industries, Inc., 
    773 F.3d 253
    ,
    255 n.1 (D.C. Cir. 2014) (argument not raised in opening brief
    on appeal is forfeited).
    We turn, then, to the Department’s non-detriment finding.
    Stand Up first attacks the Department for considering the
    casino’s benefits as well as its detriments to the surrounding
    community, arguing that “benefits that are not connected to and
    will not mitigate [a] casino’s undisputed detrimental impacts
    cannot simply cancel out those detrimental impacts.” Stand Up
    Br. 37. As Stand Up sees it, IGRA’s requirement that a casino
    “not be detrimental to the surrounding community,” 
    25 U.S.C. § 2719
    (b)(1)(A), requires that a casino have no unmitigated
    negative impacts whatsoever, not that it, on balance, have a
    positive or at least neutral net effect on the surrounding
    community.
    The district court rejected this “cramped reading” of
    IGRA, which, it found, “would result in barring any new
    gaming establishments,” given that “[a]ll new commercial
    developments are bound to entail some [unmitigated] costs.”
    Stand Up for California!, 204 F. Supp. 3d at 262 (first
    alteration in original) (quoting Stand Up for California! v. U.S.
    Department of the Interior, 
    919 F. Supp. 2d 51
    , 74 (D.D.C.
    2013)). We do too. Stand Up points to nothing in IGRA that
    forecloses the Department, when making a non-detriment
    finding, from considering a casino’s community benefits, even
    if those benefits do not directly mitigate a specific cost imposed
    by the casino. Indeed, Stand Up never even challenges IGRA
    17
    regulations that expressly allow the Department to consider
    “[a]ny . . . information that may provide a basis for a . . .
    [d]etermination whether the proposed gaming establishment
    would or would not be detrimental to the surrounding
    community.” 
    25 C.F.R. § 292.18
    (g) (emphasis added); see also
    
    id.
     § 292.21(a) (cataloguing the information the Department is
    to consider). The Department reads this regulation as
    authorizing it to consider a casino’s community benefits—even
    those that do not directly remediate a specific detriment—and
    we defer to this perfectly reasonable reading. See Confederated
    Tribes of Grand Ronde, 830 F.3d at 559 (“[W]e give substantial
    deference to an agency’s interpretation of its own regulations
    unless it is contrary to the regulation[s’] plain language.”).
    Finding no defect in the Department’s overall
    methodology, we move on to Stand Up’s argument that the
    Department’s non-detriment finding is unsupported by
    substantial evidence. Stand Up offers two reasons for this
    position, neither persuasive.
    Stand Up first claims that the finding rests on an
    assumption that the North Fork will adopt mitigation measures
    set out in an environmental impact statement the Department
    prepared to comply with the National Environmental Policy
    Act of 1969 (NEPA), 
    42 U.S.C. § 4321
     et seq. This assumption
    is untenable, Stand Up argues, because “NEPA imposes no
    substantive requirement that mitigation measures actually be
    taken.” Robertson v. Methow Valley Citizens Council, 
    490 U.S. 332
    , 353 n.16 (1989). But even if NEPA itself imposes no such
    requirement, the North Fork signed memoranda of
    understanding (MOUs) with local governments, in which it
    agreed to undertake the contemplated measures. Stand Up
    insists that the Department could not rely on the MOUs as
    evidence that the North Fork would undertake mitigation
    because the MOUs, by their terms, would go into effect only
    18
    after the North Fork had entered a compact with California
    governing the terms of gaming at the proposed casino, and
    because the Department had no guarantee that such a compact
    would ever materialize. Unchallenged IGRA regulations,
    however, obliged the Department to consider the MOUs. See
    
    25 C.F.R. § 292.18
    (g) (application to qualify for IGRA
    exception must contain information on “memoranda of
    understanding . . . with affected local governments”); 
    id.
    § 292.21(a) (Department must consider this information). And
    it was reasonable for the Department to assume that the
    mitigation measures spelled out in the MOUs would take effect
    if necessary, even if the MOUs would not become binding
    absent a tribal-state compact. In most instances, such a compact
    is a statutory precondition to gaming on Indian land, see 
    25 U.S.C. § 2710
    (d)(1)(C), and, accordingly, a precondition to
    any casino-related harms the MOUs sought to mitigate. And
    although, absent a tribal-state compact, IGRA allows the
    Department to conditionally authorize gaming under
    prescribed conditions, see 
    id.
     § 2710(d)(7)(B)(vii), the
    Department justifiably declined to allow its predictive
    judgment as to the casino’s probable effects to be governed by
    the outside possibility that the North Fork would secure
    authorization to operate the casino without also abiding by the
    MOUs, see Rural Cellular Association v. FCC, 
    588 F.3d 1095
    ,
    1105 (D.C. Cir. 2009) (“The ‘arbitrary and capricious’ standard
    is particularly deferential in matters implicating predictive
    judgments . . . .”).
    Stand Up next argues that even with the mitigation
    measures in place, the Department lacked a sufficient basis for
    making a non-detriment finding because record evidence
    estimated that the casino would add 531 new problem gamblers
    to Madera County’s adult population. Well aware of that
    consequence, the Department relied on the North Fork’s
    promise to, among other things, cover the estimated $63,600
    19
    annual treatment costs attributable to new gamblers through an
    annual $50,000 earmarked contribution to Madera County and
    an additional catchall sum specifically calculated to cover the
    remaining $13,600. According to Stand Up, this mitigation
    does not address problem gamblers who never seek treatment,
    and the record suggests treatment “may,” rather than “will,”
    attenuate problem gambling in any event. U.S. Department of
    the Interior, Bureau of Indian Affairs, Final Environmental
    Impact Statement: North Fork Casino 4.7-9 (2009), J.A. 711.
    Perhaps so, but Stand Up has failed to show that any residual
    harms the North Fork’s mitigation efforts leave unaddressed
    will be so substantial that the Department, permissibly viewing
    the casino’s net effects holistically, was obliged to find that the
    casino would be detrimental.
    The Picayune likewise focuses on a narrow subset of the
    casino’s effects—specifically, the competitive threat to its own
    gaming operations. The Department acknowledged that it
    “must accord weight to [the] Picayune’s concerns,” IGRA
    Decision at 86, J.A. 3958, but due to “the relative proximity of
    [the] Picyaune’s lands, headquarters, and existing class III
    gaming facility” to the site of the North Fork’s proposed
    casino, id. at 85, J.A. 3957, it determined, pursuant to IGRA
    regulations unchallenged by the Picayune, that the tribe was not
    part of the “surrounding community,” 
    25 C.F.R. § 292.2
    , and
    so assigned its concerns “less weight than comments submitted
    by communities and tribes that f[e]ll within the definition of
    ‘surrounding community’ in [the] regulations,” IGRA Decision
    at 85, J.A. 3957. Appropriately weighed, the Department
    concluded, the proposed casino’s competitive effects on the
    Picayune’s own operations were insufficient to mandate a
    finding that the casino would be detrimental to the surrounding
    community. See 
    id.
     The Picayune raises three challenges to the
    Department’s reasoning.
    20
    First, the Picayune argues that the Department erred in
    concluding that it was not part of the surrounding community.
    But under IGRA regulations—again unchallenged by the
    Picyaune—“[s]urrounding           community       means       local
    governments and nearby Indian tribes located within a 25-mile
    radius of the site of the proposed gaming establishment,” 
    25 C.F.R. § 292.2
    , and the Picayune concedes that it is located
    outside the relevant 25-mile radius, Picayune Br. 12 n.1.
    Insisting that it nonetheless constitutes part of the surrounding
    community, the Picayune cites a portion of the IGRA
    regulation that allows a “nearby Indian tribe located beyond the
    25-mile radius” to “petition for consultation if it can establish
    that its governmental functions, infrastructure or services will
    be directly, immediately and significantly impacted by the
    proposed gaming establishment.” 
    25 C.F.R. § 292.2
    .
    Specifically, it contends that the Department, in finding that
    “the relative proximity of [the] Picayune’s lands, headquarters,
    and existing . . . gaming facility to the [proposed casino’s] Site”
    counseled in favor of considering the Picayune’s concerns,
    IGRA Decision at 85, J.A. 3957, necessarily concluded that its
    “governmental functions, infrastructure or services will be
    directly, immediately and significantly impacted by” the North
    Fork’s casino, 
    25 C.F.R. § 292.2
    , and so was obliged to treat it
    as part of the surrounding community.
    The Picayune has given us no basis for upsetting the
    Department’s reasonable interpretation of its own regulation as
    excluding from the “surrounding community” all communities
    outside the 25-mile radius—even those that may otherwise
    petition for consultation. See Thomas Jefferson University v.
    Shalala, 
    512 U.S. 504
    , 512 (1994) (deferring to agency
    interpretation of its own regulation unless the interpretation is
    “plainly erroneous or inconsistent with the regulation” (quoting
    Udall v. Tallman, 
    380 U.S. 1
    , 16 (1965))). This interpretation
    follows readily from the regulation’s text and, contrary to the
    21
    Picayune’s argument, comports with the Department’s
    characterization—in commentary contemporaneous with the
    regulation’s promulgation—of the 25-mile radius as a
    “rebuttable presumption.” Gaming on Trust Lands Acquired
    After October 17, 1988, 
    73 Fed. Reg. 29,354
    , 29,357 (May 20,
    2008). A community outside the radius may, by showing that
    it will be “directly, immediately and significantly impacted by”
    a casino, rebut the presumption that it is not entitled to
    consultation, even while remaining outside the “surrounding
    community.” 
    25 C.F.R. § 292.2
    .
    Second, the Picyaune argues that even if the Department
    properly considered it to be outside the “surrounding
    community,” nothing in IGRA’s regulations “hints at the
    [Department] having any discretion to discount the weight”
    afforded to input from any community included in the
    consultation process. Picayune Br. 30. Contrary to the tribe’s
    improbable assumption, however, nothing in the regulations so
    much as suggests that the Department must treat differently
    situated communities identically. To be sure, a casino might
    have substantial effects on even far-flung communities, but
    Congress was concerned only with the “surrounding
    community,” 
    25 U.S.C. § 2719
    (b)(1)(A), and given Congress’s
    choice to speak in geographic terms, the Department
    reasonably concluded that “[t]he weight accorded to the
    comments of tribes and local governments outside the
    definition of ‘surrounding community’ will naturally diminish
    as the distance between their jurisdictions and the proposed off-
    reservation gaming site increases,” IGRA Decision at 86, J.A.
    3958.
    Lastly, the Picayune claims that the Department ignored
    evidence that competition from the North Fork’s proposed
    casino would reduce its revenues, causing job loss and reduced
    public services. Expressly acknowledging this evidence, the
    22
    Department nonetheless concluded that because the Picayune’s
    casino “has proven to be a successful operation in a highly
    competitive gaming market,” any “competition from the [North
    Fork] Tribe’s proposed gaming facility in an overlapping
    gaming market is not sufficient, in and of itself, to conclude
    that it would result in a detrimental impact to [the] Picayune.”
    
    Id.
     Contrary to the Picayune’s suggestion, the Department did
    not discount an anticipated competitive injury merely because
    “the source of the injury was competition,” Picayune Br. 34;
    instead, the Department concluded that the Picayune’s casino
    could successfully absorb the expected competitive effects.
    Given the reduced weight the Department permissibly assigned
    the Picayune’s concerns, it concluded—appropriately in our
    view—that the casino’s potential effects on the tribe were
    insufficient to render the casino detrimental to the surrounding
    community overall.
    B.
    Rounding out the bevy of challenges to the predicate
    determinations underlying the trust decision, Stand Up attacks
    the Department’s finding that the proposed casino project
    conformed to California’s plan for achieving compliance with
    federal air quality standards under the Clean Air Act. See 
    42 U.S.C. § 7410
     (describing requirements for state
    implementation plans for achieving air quality standards); 
    id.
    § 7506(c) (placing “affirmative responsibility” on federal
    agency heads to ensure certain projects’ conformity to the
    relevant state implementation plans prior to approval). The
    Department concedes that it is unable to prove that, prior to
    issuing its conformity determination in June 2011, it gave prior
    notice to each and every governmental and tribal entity entitled
    to such notice as required by Clean Air Act regulations. See 
    40 C.F.R. § 93.155
    (a) (listing entities entitled to notice). When
    this defect was first brought to the district court’s attention, it
    responded by allowing a limited remand, without vacatur, so
    23
    that the Department could belatedly issue the required notice
    and consider any responsive comments. See Stand Up for
    California!, 204 F. Supp. 3d at 236. After taking these steps in
    2014, the Department reissued its original determination
    unchanged.
    Stand Up argues that the Department’s notice violation
    was incapable of after-the-fact cure and so required the district
    court to vacate the conformity determination. In initially
    granting remand without vacatur, however, the district court
    observed that the procedural flaw was minimal because the
    Department had given prior public notice of its determination
    in 2011, as well as specific notice targeting the entities “most
    likely to have substantive comments,” and because “the much
    broader Environmental Impact Statement required under the
    [NEPA] was widely publicized and heavily commented upon.”
    Stand Up for California! v. U.S. Department of the Interior,
    No. 12-2039, 
    2013 WL 12203229
    , at *3 & n.2 (D.D.C. Dec.
    16, 2013). Given the notice defect’s relative insignificance, as
    well as the potentially “disruptive consequences” of rolling
    back an essential predicate to the trust decision, the district
    court acted well within its discretion in finding vacatur
    unnecessary to address any harm the defect had caused. Sugar
    Cane Growers Co-operative of Florida v. Veneman, 
    289 F.3d 89
    , 98 (D.C. Cir. 2002) (“[T]he decision whether to vacate
    depends on ‘the seriousness of the order’s deficiencies . . . and
    the disruptive consequences of an interim change that may
    itself be changed.’” (quoting Allied-Signal, Inc. v. United
    States Nuclear Regulatory Commission, 
    988 F.2d 146
    , 150–51
    (D.C. Cir. 1993))); see also State of Nebraska Department of
    Health & Human Services v. Department of Health & Human
    Services, 
    435 F.3d 326
    , 330 (D.C. Cir. 2006) (reviewing
    district court’s choice of equitable remedy for abuse of
    discretion).
    24
    Stand Up contends that “[e]ven if the district court could
    properly remand without vacating the [Department’s] initial
    [conformity determination], the [Department’s] actions on
    remand—which treated the notice as perfunctory and simply
    rubber-stamped [its] earlier decision—were inadequate to meet
    the Clean Air Act’s requirements.” Stand Up Reply Br. 23. But
    in ordering remand without vacatur, the district court
    considered it “substantially likely” that the Department would
    “reach the same conclusion and reinstitute the same action” on
    remand, given that the Department had initially made the
    conformity determination only after considerable participation
    from multiple stakeholders. Stand Up for California!, 
    2013 WL 12203229
    , at *3. Stand Up identifies no new facts or
    considerations raised on remand that required the Department
    to part ways with its earlier conclusion.
    Finally, Stand Up argues that the conformity
    determination, contrary to EPA regulations, was not “based on
    the latest and most accurate emission estimation techniques,”
    
    40 C.F.R. § 93.159
    (b), and in particular on “the most current”
    available motor vehicle emissions model specified by the
    agency, 
    id.
     § 93.159(b)(1). When first issued in 2011, the
    determination here undisputedly complied with this
    requirement. But because EPA updated the relevant emissions
    model for California in 2013, see Official Release of
    EMFAC2011 Motor Vehicle Emission Factor Model for Use
    in the State of California, 
    78 Fed. Reg. 14,533
     (Mar. 6, 2013),
    Stand Up argues that the Department, when reissuing the 2011
    conformity determination on remand in 2014, should have
    done its calculations in accordance with the 2013 emissions
    model.
    The parties dispute whether the reissued conformity
    determination falls into a regulatory safe harbor that allows
    “[c]onformity analyses for which the analysis was begun [three
    25
    months after] or no more than 3 months before” announcement
    of a new emissions model to rely on the prior model. 
    40 C.F.R. § 93.159
    (b)(1)(ii). We need not address this issue, however,
    because the relevant date for compliance with the regulatory
    emissions modeling requirement was 2011, when the
    Department initially made its conformity determination.
    Although the determination was subject to a limited remand on
    an unrelated notice issue, it was never vacated. In withholding
    vacatur, the district court expressly rejected Stand Up’s
    “argument that the remand should require the [Department] to
    perform the entire Clean Air Act conformity determination
    again,” Stand Up for California!, 
    2013 WL 12203229
    , at *4,
    instead viewing the remand as giving the Department an
    opportunity to “remedy a minor procedural defect,” 
    id. at *1
    .
    As we have already concluded, the district court acted well
    within its discretion in determining that the appropriate remedy
    for the Department’s notice violation was a narrow remand for
    a single purpose. Under such circumstances, the Department
    had no obligation to rebuild the conformity determination from
    the ground up. Cf. Allied-Signal, 
    988 F.2d at 151
     (agency need
    not refund fees collected under an inadequately supported rule
    where district court remands without vacatur to allow agency
    to “develop a reasoned explanation based on an alternative
    justification”).
    To be clear, we agree with Stand Up that an agency “is
    bound to enforce administrative guidelines in effect when it
    takes final action.” Sierra Club v. EPA, 
    762 F.3d 971
    , 980 (9th
    Cir. 2014). Here, the Department’s “final action” took place in
    2011 and complied fully with the relevant regulatory
    requirement. Since then, the Department has done nothing
    more than ratify that final action in response to a narrow
    remand order that not only declined to vacate the 2011
    conformity determination, but also affirmatively found it
    unnecessary for the agency to redo its prior analysis.
    26
    IV.
    After reviewing thousands of pages of evidence over the
    span of seven years, the Interior Department took the tract of
    land at issue into trust for the North Fork and approved the
    tribe’s proposed casino. Viewing the same extensive record
    and affording the appropriate measure of deference to the
    Department’s supportable judgments, we, like the district
    court, conclude that this decision was reasonable and consistent
    with applicable law. We affirm.
    So ordered.