WildEarth Guardians v. United States Fish & Wildlife Service ( 2015 )


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  •                                                                 FILED
    United States Court of Appeals
    Tenth Circuit
    April 17, 2015
    PUBLISH             Elisabeth A. Shumaker
    Clerk of Court
    UNITED STATES COURT OF APPEALS
    TENTH CIRCUIT
    WILDEARTH GUARDIANS; ROCKY
    MOUNTAIN WILD; THE TOWN OF
    SUPERIOR, a Colorado municipality,
    Plaintiffs - Appellants,
    and
    CITY OF GOLDEN, COLORADO,
    Plaintiff,
    v.
    UNITED STATES FISH AND
    WILDLIFE SERVICE; UNITED
    STATES DEPARTMENT OF THE
    INTERIOR; S.M.R. JEWELL, acting               Nos. 12-1508 & 12-1509
    in her official capacity as Secretary of
    the Interior; DANIEL M. ASHE,
    acting in his official capacity as
    Director of the United States Fish and
    Wildlife Service; NOREEN WALSH,
    acting in her official capacity as
    Regional Director of the
    Mountain-Prairie Region of the United
    States Fish and Wildlife Service;
    DAVID LUCAS, acting in his official
    capacity as Rocky Flats National
    Wildlife Refuge Manager,
    Defendants - Appellees,
    and
    THE BOARD OF COUNTY
    COMMISSIONERS OF THE
    COUNTY OF JEFFERSON,
    COLOARDO; CITY OF ARVADA;
    JEFFERSON PARKWAY PUBLIC
    HIGHWAY AUTHORITY;
    COLORADO NATURAL RESOURCE
    TRUSTEES OF THE STATE OF
    COLORADO; THE BOARD OF
    LAND COMMISSIONERS OF THE
    STATE OF COLORADO,
    Defendant Intervenors -
    Appellees.
    Appeal from the United States District Court
    for the District of Colorado
    (D.C. No. 1:11-CV-03294-PAB)
    Neil Levine (James Jay Tutchton, WildEarth Guardians, Centennial, Colorado,
    and Matthew Sandler, Rocky Mountain Wild, Denver, Colorado, Timothy
    Gablehouse and Melanie Granberg, Gablehouse Granberg, Denver, Colorado, with
    him on the briefs), Grand Canyon Trust, Denver, Colorado, for Plaintiffs-
    Appellants.
    Mary Gabrielle Sprague (Robert G. Dreher, Acting Assistant Attorney General,
    U.S. Department of Justice, Environment & Natural Resources Division,
    Washington, DC; Andrew C. Mergen and Ellen J. Durkee, U.S. Department of
    Justice, Environment & Natural Resources Division, Appellate Section,
    Washington, DC, with her on the brief), U.S. Department of Justice, Environment
    & Natural Resources Division, Appellate Section, Washington, DC, for
    Defendants-Appellees.
    Howard Kenison and Patrick G. Compton, Lindquist & Vennum LLP, Denver,
    Colorado; Ellen G. Wakeman, Jefferson County Attorney, Writer Mott, Assistant
    County Attorney, and Eric Butler, Assistant County Attorney, Jefferson County
    Attorney’s Office, Golden, Colorado; Christopher K. Daly, City Attorney, and
    Roberto Ramirez, Assistant City Attorney, City of Arvada City Attorney’s Office,
    2
    Arvada, Colorado; John W. Suthers, Attorney General, Daniel S. Miller, Senior
    Assistant Attorney General, Edgar Hamrick, First Assistant Attorney General,
    Jason King, Assistant Attorney General, and Heather Warren, Assistant Attorney
    General, Office of the Attorney General, State of Colorado, Denver, Colorado, on
    the brief for Defendant-Intervenors-Appellees.
    Before HARTZ, HOLMES, and BACHARACH, * Circuit Judges.
    HOLMES, Circuit Judge.
    The U.S. Fish and Wildlife Service (“the Service”) conveyed to a
    consortium of local governments a strip of land (“the corridor”) for the
    construction of a parkway. Its decision was challenged on various environmental
    grounds by several parties, including WildEarth Guardians, Rocky Mountain
    Wild, the Town of Superior, and the City of Golden (collectively, “Appellants”).
    The district court affirmed the Service’s actions, and Appellants brought their
    claims here. They assert that the Service violated the Rocky Flats National
    Wildlife Refuge Act (“the Rocky Flats Act” or “RFA”), the National
    Environmental Policy Act (“NEPA”), and the Endangered Species Act (“the
    ESA”). With jurisdiction granted by 28 U.S.C. § 1291, we affirm the judgment
    *
    The late Honorable William J. Holloway, Jr., United States Senior
    Circuit Judge, was originally assigned to this case and heard oral argument on
    November 20, 2013. Upon his death, the Honorable Robert E. Bacharach was
    substituted on this panel. Judge Bacharach has reviewed the record and all the
    pleadings filed in this matter, has listened to the recording created from the oral
    argument hearing, and has fully participated in the ultimate resolution of this
    case.
    3
    of the district court.
    I
    Rocky Flats (at times, “the Flats”) is comprised of roughly 6,200 acres in
    Colorado. For a number of years the Department of Energy (“Energy”) and its
    predecessor agency used the central part of the Flats to manufacture components
    involved in nuclear weapons, while the remainder of the Flats sat idle. As a result
    of the weapons work, some of the land became polluted by various hazardous
    materials, including plutonium. In 1989, a large-scale cleanup operation began.
    Recognizing the progress that had been made in the cleanup effort, Congress
    passed the Rocky Flats Act in 2001. National Defense Authorization Act for
    Fiscal Year 2002, Pub. L. No. 107-107, 115 Stat. 1012, §§ 3171–82 (2001), 16
    U.S.C. § 668dd note. 1 Under the Rocky Flats Act, Energy was to manage the
    central area of the Flats (the locus of the earlier nuclear activity) and the balance
    of the Flats was to become a National Wildlife Refuge run by the Service, an arm
    of the Department of the Interior. 2 See generally RFA §§ 3175–77.
    The Rocky Flats Act further provided that Energy would transfer to the
    Service administrative jurisdiction of the land marked for refuge status as soon as
    1
    Following the lead of the parties, we refer to sections of the Rocky
    Flats Act, rather than the sections of the U.S. Code, and use the form “RFA § __”
    where a full citation is needed.
    2
    Because the Service is the only branch of the Department of the
    Interior that is relevant to this appeal, we refer to the Service even where other
    materials relevant to this litigation refer to the Department as a whole.
    4
    the EPA determined the cleanup was complete. See 
    id. § 3175(a).
    Importantly,
    the Rocky Flats Act set aside a piece of land along the Flats’s border to be made
    available for transportation improvements. See 
    id. § 3174(e)(1)(A).
    To facilitate
    the transportation improvements, the Rocky Flats Act provided that, “[o]n
    submission of an application meeting” certain criteria not relevant to this appeal,
    “[Energy], in consultation with the [Service], shall make available land along the
    eastern boundary of Rocky Flats for the sole purpose of transportation
    improvements along Indiana Street.” 
    Id. The transfer
    was to take place within a
    month of the EPA certifying the cleanup as complete. 
    Id. § 3175(a)(2),
    (3).
    Pursuant to the Rocky Flats Act, Energy transferred the Flats to the Service
    when the EPA issued its certification in 2007. Not long after, Energy and the
    Service mutually decided that the applications for the transportation
    improvements were the Service’s to consider, in consultation with Energy. And
    so it was that the Service ended up giving the green light to the exchange
    underlying this appeal, with Energy’s ancillary approval. In that exchange, the
    Service engineered a complicated deal amongst a number of different parties in
    which it added some land to the refuge but transferred a roughly 300-foot-wide,
    100-acre strip of land to a consortium of local governments that planned to
    construct a parkway as part of a mostly-completed beltway encircling the Denver
    metropolitan area.
    The Preble’s Meadow Jumping Mouse (sometimes, “the mouse”) is a
    5
    threatened species with critical habitat in the corridor. Prior to its final approval
    of the land exchange, and pursuant to the ESA, the Service issued two biological
    opinions on the potential consequences of the exchange to the mouse. The
    product of those opinions was a determination that the exchange would not
    jeopardize the continued existence of the mouse or adversely modify its critical
    habitat.
    In addition to the ESA, NEPA imposed on the Service various obligations
    regarding the exchange. Most relevant here, NEPA directs federal agencies to
    prepare an environmental impact statement (“EIS”) whenever they undertake
    “major Federal actions significantly affecting the quality of the human
    environment.” 42 U.S.C. § 4332(C). To determine whether the statutory
    conditions for preparation of an EIS are present, an agency generates an
    environmental assessment (“EA”). See 40 C.F.R. § 1501.4(b). If the EA leads to
    the conclusion that no EIS is necessary, the agency creates a “finding of no
    significant impact” (“FONSI”). See 
    id. § 1501.4(e).
    The Service in this case
    issued an EA and a FONSI rather than an EIS. After the EA was circulated for
    public comment, the exchange went ahead as planned.
    Displeased by the land exchange, Appellants sued in federal district court,
    challenging the Service’s actions on three grounds: (1) they violated the Rocky
    Flats Act; (2) they violated NEPA; and (3) they violated the ESA. The district
    court rejected all three claims and upheld the exchange. Appellants timely
    6
    appealed, reviving the same three grounds.
    II
    We consider the appeal under the analytical rubric established by the
    Administrative Procedure Act (“APA”). See 5 U.S.C. § 706(2)(C) (providing that
    the courts will set aside agency action taken “in excess of statutory jurisdiction”);
    Prairie Band Pottawatomie Nation v. Fed. Highway Admin., 
    684 F.3d 1002
    , 1008
    (10th Cir. 2012) (applying the APA to a NEPA claim); Ctr. for Native Ecosystems
    v. Cables, 
    509 F.3d 1310
    , 1320 (10th Cir. 2007) (applying the APA to an ESA
    claim). Under the APA, we owe the district court’s determination no deference.
    See Wyoming v. U.S. Dep’t of Agric., 
    661 F.3d 1209
    , 1226–27 (10th Cir. 2011).
    However, we may only set aside the Service’s actions if, as relevant to the
    arguments here, it acted arbitrarily or capriciously, not in accordance with the
    law, beyond its jurisdictional authority, or “without observance of procedure
    required by law.” 5 U.S.C. § 706(2)(A), (C), (D).
    That test is met when an agency fails to consider “the relevant data” or fails
    to put forth “a rational connection between that data and its decision.” WildEarth
    Guardians v. Nat’l Park Serv., 
    703 F.3d 1178
    , 1182–83 (10th Cir. 2013). It is
    also met when the agency “entirely failed to consider an important aspect of the
    problem, offered an explanation for its decision that runs counter to the evidence
    before the agency, or is so implausible that it could not be ascribed to a difference
    in view or the product of agency expertise.” Motor Vehicle Mfrs. Ass’n of U.S.,
    7
    Inc. v. State Farm Mut. Auto. Ins. Co., 
    463 U.S. 29
    , 43 (1983). “Our deference to
    the agency is more substantial when the challenged decision involves technical or
    scientific matters within the agency’s area of expertise.” Nat’l Park 
    Serv., 703 F.3d at 1183
    .
    III
    Appellants challenge the Service’s actions on three statutory bases:
    specifically, the Rocky Flats Act, NEPA, and the ESA. Because they fail to show
    violations of any of these Acts, we affirm.
    A
    Appellants first contend that the Service lacked the authority to convey the
    corridor under the Rocky Flats Act. Constrained by our deferential standard of
    review, we uphold the Service’s authority.
    1
    We must first ascertain the appropriate framework for assessing the
    Service’s power. The APA directs courts to set aside agency actions that are
    taken “in excess of statutory jurisdiction, authority, or limitations, or short of
    statutory right.” 5 U.S.C. § 706(2)(C). Because of this provision, “an essential
    function of our review under the APA is determining whether an agency acted
    within the scope of its authority.” Copar Pumice Co. v. Tidwell, 
    603 F.3d 780
    ,
    801 (10th Cir. 2010). If it is otherwise appropriate, we apply the test established
    by Chevron, U.S.A., Inc. v. Natural Resources Defense Council, 
    467 U.S. 837
    8
    (1984), when asking whether an agency has acted within its authority. See Pub.
    Lands Council v. Babbitt, 
    167 F.3d 1287
    , 1293–94 (10th Cir. 1999); see also Iowa
    League of Cities v. EPA, 
    711 F.3d 844
    , 876 (8th Cir. 2013) (“Appellate review
    under APA section 706(2)(C) proceeds under the familiar Chevron framework.”).
    As a preliminary matter, Appellants insist that it is not otherwise
    appropriate to apply Chevron because the Rocky Flats Act is not “administered”
    by the Service. See Berneike v. CitiMortgage, Inc., 
    708 F.3d 1141
    , 1147 (10th
    Cir. 2013) (“When reviewing an agency’s construction of a statute it administers,
    we apply the well-known, two-step analysis articulated in Chevron . . . .”
    (emphasis added)). Its argument to that effect is limited to the contention that
    Congress in the Rocky Flats Act did not “delegate administration” to the Service,
    but rather “regulate[d]” the Service’s “actions and obligations concerning Rocky
    Flats,” and those of Energy. Aplts.’ Opening Br. at 19.
    The cases that Appellants cite 3 do not draw any distinction between statutes
    that “regulate” an agency and those that are “administered” by one. Indeed, it
    would be odd if the law did draw such a distinction, as any statute that an agency
    administers necessarily regulates that agency to some extent, at least in the sense
    that it imposes various obligations on the agency and instructs it to take various
    actions. In the Rocky Flats Act, Congress imposed a number of obligations on
    3
    City of Arlington v. FCC, --- U.S. ----, 
    133 S. Ct. 1863
    (2013), and
    Ariz. Pub. Serv. Co. v. EPA, 
    562 F.3d 1116
    (10th Cir. 2009).
    9
    both Energy and the Service, and provided them a wide latitude in how they
    fulfilled many of those obligations. That is sufficient to defeat Appellants’ false
    dichotomy and to apply the Chevron framework. 4
    2
    The Chevron test requires us to ask first “whether Congress has directly
    spoken to the precise question at issue.” 
    Chevron, 467 U.S. at 842
    . If it has,
    “that is the end of the matter” and we do as instructed by Congress. 
    Id. If, on
    the
    other hand, “the statute is silent or ambiguous with respect to the specific issue,
    the question for the court is whether the agency’s answer is based on a
    permissible construction of the statute.” 
    Id. at 843.
    Our inquiry must begin, then,
    with this question: Did Congress directly address the matter of whether the
    Service could convey the corridor? Focusing on the language of the statute, as we
    must, see Bd. of Cnty. Comm’rs v. EEOC, 
    405 F.3d 840
    , 844 (10th Cir. 2005), we
    conclude that it did not. One provision of the Rocky Flats Act states that “[o]n
    4
    If Appellants mean to suggest that Chevron is inapplicable because
    the case does not involve the Service’s “organic” statute, i.e., the law that actually
    established the agency, they are mistaken in assuming that Chevron is always
    limited to such circumstances. See NISH v. Rumsfeld, 
    348 F.3d 1263
    , 1267–72
    (10th Cir. 2003) (applying Chevron to the Department of Education’s
    interpretation of an act that was not its organic statute). On a similar note,
    Appellants do not argue that the Service’s conveyance of the land falls outside
    Chevron because it lacked the trappings of formal rule-making or adjudication,
    see generally United States v. Mead Corp., 
    533 U.S. 218
    (2001), so we do not
    address that issue. They also decline to argue that Energy, and not the Service, is
    entitled to deference regarding the implementation of the pertinent provisions of
    the Rocky Flats Act. We therefore forgo any discussion of that point.
    10
    submission of an application meeting” certain criteria, “[Energy], in consultation
    with the [Service], shall make available land along the eastern boundary of Rocky
    Flats for the sole purpose of transportation improvements along Indiana Street.”
    RFA § 3174(e)(1)(A). Another section of the Act, which falls under the heading
    “transfer of management responsibilities and jurisdiction over Rocky Flats,”
    states that, “[s]ubject to the other provisions of this section, [Energy] shall
    transfer administrative jurisdiction over the property that is to comprise the refuge
    to the [Service].” 
    Id. § 3175(a)(1).
    Collectively, these provisions leave the crucial question here unanswered.
    We know that Energy, at some point, has the authority to convey the land solely
    for transportation purposes. And we know that, at a certain point, Energy will
    transfer jurisdiction over the whole refuge 5 to the Service. What we do not know
    from the statute’s plain language is whether the authority—indeed, the
    obligation—to make the land available for transportation purposes switches to the
    Service upon Energy’s transfer to the Service of jurisdiction over the refuge, or
    whether, as Appellants maintain, that authority is extinguished upon this transfer
    by Energy because Congress intended to vest only Energy with the authority to
    5
    In their opening brief, Appellants unequivocally took the position
    that Congress placed the corridor within the refuge. See, e.g., Aplts.’ Opening
    Br. at 20 (“Congress ensured the Corridor would not become a highway once it
    became part of the refuge.” (emphasis added)). We therefore undertake the
    following analysis on the basis of that premise.
    11
    make the land available. 6 Regarding this question, the Rocky Flats Act is silent;
    therefore, we turn to step two of Chevron.
    3
    Thus the question becomes “whether the agency’s answer is based on a
    permissible construction of the statute.” 
    Chevron, 467 U.S. at 843
    . An agency
    interpretation is permissible where it “is not ‘arbitrary, capricious, or manifestly
    contrary to the statute.’” 
    Berneike, 708 F.3d at 1148
    (quoting 
    Chevron, 467 U.S. at 843
    –44).
    a
    Most saliently, preventing Appellants from showing that the Service’s
    answer is not permissible are two of the oldest and most established canons of
    statutory construction: (1) effectuating the intent of Congress; and (2) taking the
    6
    We recognize that there may be a third possibility: Energy retained
    the ability to make the corridor available for transportation purposes even after
    transferring jurisdiction over the land that would constitute the refuge, including
    the corridor, to the Service. However, Appellants have eschewed this option, and
    instead have consistently maintained that neither agency had the authority to
    make the corridor available for transportation improvements after jurisdiction
    over the land that included the corridor was transferred to the Service. See, e.g.,
    Aplts.’ Opening Br. at 14 (“The . . . authority to convey the Corridor . . . was
    limited and has now expired. . . . [T]his authority existed only so long as
    [Energy] retained jurisdiction and the Corridor was not part of a National Wildlife
    Refuge.”); 
    id. at 20
    (“The authority . . . to convey the corridor terminated when
    the refuge was established.” (capitalization removed)); 
    id. at 22
    (“Now that the
    Corridor is part of the Refuge, it must remain so.”). Thus, we need not entertain
    this alternative explanation. And, in any event, the statute does not make pellucid
    that Energy retained authority after the transfer, so this interpretation fails step
    one of Chevron.
    12
    statutory language in context. See United States v. Handley, 
    678 F.3d 1185
    , 1189
    (10th Cir. 2012) (“It is our primary task in interpreting statutes to determine
    [C]ongressional intent . . . . If the statute’s plain language is ambiguous as to
    Congressional intent, we look to the legislative history and the underlying public
    policy of the statute. . . . When considering the language employed by Congress,
    we read the words of the statute in their context and with a view to their place in
    the overall statutory scheme . . . .” (alteration in original) (internal quotation
    marks omitted)); see also Antonin Scalia & Bryan Garner, Reading Law: The
    Interpretation of Legal Texts 56 (2012) (“[I]t can be said more generally that the
    resolution of an ambiguity . . . that achieves a statute’s purpose should be favored
    over a resolution that frustrates its purpose.”); 
    id. at 167
    (“Context is the primary
    determinant of meaning.”). These guidelines strongly militate in favor of the
    Service’s authority to convey the land.
    i
    First, Congress clearly passed the Rocky Flats Act with the intent, in part,
    to relieve the burden on transportation in the area. Indeed, there is no other
    conceivable reason why it included the provision, and Appellants do not propose
    one. Keeping that congressional interest in mind, Appellants’ construction of the
    Rocky Flats Act clearly thwarts it. As Appellants see it, the Rocky Flats Act
    gives Energy the authority to convey the corridor for transportation improvements
    until the area is fully clean and a refuge (that is, until the area is in such a
    13
    condition that administrative jurisdiction over it may be transferred to the
    Service), at which point no one has that conveyance authority and the corridor can
    never be subject to transportation improvements. But Appellants offer no reason
    why Congress would limit the possibility of transportation improvements to such
    a narrow window (before the cleanup is completed) and then close it forever
    thereafter. Such a system would certainly not further the congressional purpose
    of allowing for long-term improvements to local traffic patterns.
    ii
    In a related fashion, a glance at the context of the Rocky Flats Act as a
    whole illuminates congressional intent with respect to the more specific issue of
    the administrative duties and rights imposed on Energy and the Service
    respectively; the effect of this glance is to undermine Appellants’ reading of the
    statute. It reveals that in the Rocky Flats Act, Congress intended for Energy to
    handle energy-related matters and the Service to handle nature-related matters—a
    reasonable and logical division of responsibilities.
    Section 3174 of the Rocky Flats Act contains the provision regarding the
    conveyance of the corridor. The very next section is entitled “transfer of
    management responsibilities and jurisdiction over Rocky Flats,” and it begins by
    stating that “[Energy] shall transfer administrative jurisdiction over the property
    that is to comprise the refuge to the [Service].” RFA § 3175(a)(1). Energy only
    14
    had the land because of the nuclear facilities it once contained, the remnants of
    which required removal; this removal work was a core element of Energy’s
    operations. See United States v. Manning, 
    527 F.3d 828
    , 839 (9th Cir. 2008)
    (discussing Energy’s role in “the nationwide management of nuclear waste”).
    Under the legislative scheme, it only stands to reason that the Service would take
    control of the land and its disposition when it becomes a refuge, because
    managing refuges is firmly within the Service’s bailiwick. See 16 U.S.C.
    § 668dd(a)(1) (directing the Service to administer federal refuges). The scheme is
    further elucidated by the fact that the Rocky Flats Act directs Energy to retain
    jurisdiction only over facilities related to the continuing cleanup efforts. See
    RFA § 3175(d). Put simply, the Rocky Flats Act acknowledges that Energy
    should take care of energy-related matters and the Service should take care of
    nature-related matters. 7
    Appellants read an exception into the Rocky Flats Act that cannot be
    squared with this common-sense administrative allotment. For under their
    7
    Appellants’ best interpretive argument is that other provisions of the
    Rocky Flats Act explicitly apply to both Energy and the Service, and this one
    does not, thereby implying that only the former has the authority to convey the
    corridor. See, e.g., RFA § 3174(c) (“Neither [Energy] nor the [Service] shall
    allow the annexation of land within the refuge by any unit of local government.”
    (emphases added)). Nevertheless, at best, this point shows that there are other
    reasonable interpretations of the Act in addition to the Service’s. It does not
    show that Appellants’ is the only plausible alternative. Under Chevron, we must
    still therefore defer to the Service’s interpretation.
    15
    reading, Energy—and Energy alone—could convey the corridor for transportation
    improvements. Yet, Appellants fail to explain why Congress would have wanted
    long-lasting improvements only if a deal to effectuate these improvements could
    be reached before the administrative hand-off occurred between Energy and the
    Service. Moreover, managing such a project (and ensuring that it does not unduly
    impair the refuge) clearly falls squarely within the Service’s administrative
    responsibilities, as the Service is in charge of refuge-related matters. 8
    b
    In addition to the Rocky Flats Act, the Service argues that it had the
    complimentary authority to convey the land under the National Wildlife Refuge
    System Act (“the Refuge Act”) and the Fish and Wildlife Act. Appellants’ only
    response is that the Service never invoked those Acts during the administrative
    process and thus cannot avail themselves of them now. Although “[i]t is well-
    established that an agency’s action must be upheld, if it all, on the basis
    articulated by the agency itself,” State 
    Farm, 463 U.S. at 50
    , Appellants are
    simply wrong that the Service cited the Rocky Flats Act as its only authority. See
    8
    Appellants insist that our “interpretation would also render the
    language in § 3174(e)(1)(A) meaningless.” Aplts.’ Opening Br. at 19. Not so.
    As we read it, § 3174(e)(1)(A) made clear that Energy had the power to convey
    the corridor before the refuge was established, whereas the Service was intended
    to have the power afterwards. The provision therefore served a definite role,
    albeit one that became irrelevant after the land was transferred from one agency
    to the other.
    16
    Aplts.’ App. at 386 (Agreement for the Exch. of Lands) (relying on the Refuge
    Act); 
    id. at 412
    (Envtl. Assessment, prepared Dec. 8, 2011) (relying on the Fish
    and Wildlife Act and the Refuge Act); 
    id. at 514
    (Response 105.17) (relying on
    the Fish and Wildlife Act). Because Appellants’ only argument against the
    Service’s authority under the Refuge Act and the Fish and Wildlife Act is
    predicated on a misunderstanding of the record, we reject it for that reason alone.
    See United States v. Yelloweagle, 
    643 F.3d 1275
    , 1284 (10th Cir. 2011) (noting
    that we will not “make arguments for” a litigant).
    Even were we to reach the substance of Appellants’ contention, we would
    conclude that these additional authorities strengthen the Service’s position. A
    provision of the Refuge Act authorizes the Service to “[a]cquire lands or interests
    therein by exchange . . . for acquired lands or public lands, or for interests in
    acquired or public lands.” 16 U.S.C. § 668dd(b)(3). A similar provision of the
    Fish and Wildlife Act provides that the Service shall “take such steps as may be
    required for the development, advancement, management, conservation, and
    protection of fish and wildlife resources including . . . acquisition by purchase or
    exchange of land and water, or interests therein.” 
    Id. § 742f(a)(4).
    Given the
    ambiguity of the Rocky Flats Act’s plain language, the fact that the Service
    enjoys the power to enter into land exchanges like this one as a general matter
    bolsters the reasonableness of the Service’s view that it had the power to preside
    17
    over the exchange here. See Goodyear Atomic Corp. v. Miller, 
    486 U.S. 174
    ,
    184–85 (1988) (“We generally presume that Congress is knowledgeable about
    existing law pertinent to the legislation it enacts.”). 9
    4
    On a final point, we directed the parties to submit supplemental briefs on
    the potential bearing that RFA § 3175(d)(1)(B) has on the Service’s authority to
    convey the corridor. Having considered the additional arguments on that
    question, we determine that the provision does not affect the analysis set forth
    above.
    According to this provision,
    “[t]he transfer required by subsection (a) shall not include, and
    [Energy] shall retain jurisdiction, authority, and control over, the
    following real property and facilities at Rocky Flats: . . . [a]ny
    real property or facility to be used for any other purpose relating
    to a response action or any other action that is required to be
    carried out by [Energy] at Rocky Flats.”
    9
    At oral argument, Appellants averred that the Refuge Act and the
    Fish and Wildlife Act mandate different procedures that the Service was required
    to comply with if it intended to use them. Appellants did not make this argument
    in their briefs, so we decline to consider it. See United States v. Rutland, 
    705 F.3d 1238
    , 1247 n.2 (10th Cir. 2013) (“[W]e do not address arguments raised for
    the first time at oral argument.”). In any event, we are not holding that the
    Service did or did not follow all of the statutory prerequisites for relying on the
    Refuge Act and the Wildlife Act; we are holding only that the Acts establish the
    Service’s authority to organize similar deals, that the Service did invoke the Acts
    as part of its authority during the administrative process (regardless of whether it
    observed all of the technicalities articulated by the Acts), and that the Service is
    therefore now entitled to cite the Acts to support the reasonableness of its
    statutory interpretation of the Rocky Flats Act.
    18
    RFA § 3175(d)(1), (d)(1)(B) (emphasis added). Subsection (a), in turn, provides
    that “[s]ubject to the other provisions of this section, [Energy] shall transfer
    administrative jurisdiction over the property that is to comprise the refuge to the
    [Service].” 
    Id. § 3175(a)(1).
    Appellants submit that this catch-all clause—“or any other action”—refers
    to the corridor, as Energy was tasked with making it available for transportation
    improvements. See RFA § 3174(e)(1)(A). Thus, as Appellants see it,
    § 3175(d)(1)(B) indicates that Energy was never supposed to hand over the
    corridor to the Service. See Aplts.’ Supp. Br. at 6 (“Congress anticipated that
    [Energy] would not transfer the Corridor to [the Service] for inclusion in the
    Refuge.”). This, reason Appellants, “explains why Congress, in Section
    3174(e)(1)(A), authorized only [Energy] to ‘make available’ the Corridor, and not
    [the Service].” 
    Id. Notably, Appellants
    take the position that Energy “did not, in fact, retain
    the Corridor” when it transferred to the Service administrative jurisdiction over
    the land allocated for the refuge. 
    Id. And, because
    Energy supposedly “missed
    its opportunity to retain this property” by virtue of the transfer, it forfeited the
    authority to convey the corridor for transportation purposes that it otherwise
    would have had under the congressional grant of § 3175(d)(1)(B). Id.; see 
    id. (“Had [Energy]
    retained jurisdiction in accordance with Section 3175(d)(1)(B),
    19
    [Energy] could convey the Corridor for transportation improvements in
    accordance with Section 3174(e)(1)(A).” (emphasis added)). Nevertheless,
    according to Appellants, this transfer to the Service does not alter the fact that
    Congress never intended for the Service to have jurisdiction over the corridor. 
    Id. at 7
    (“The fact that [Energy] did not retain jurisdiction over the Corridor, or
    convey it before the 2007 transfer, does not change the fact that [the Service]
    never had authority under the Rocky Flats Act to engage in the 2011 Land
    Exchange.”). We cannot accept Appellants’ argument.
    We begin by explaining Appellants’ reasoning in greater detail. They
    contend that “other than the various response actions and the duty to make
    available the Corridor, there are no required actions for [Energy] at Rocky Flats.”
    Aplts.’ Supp. Br. at 5. As a result, the “any other action” language “must involve
    [Energy’s] requirement to make available the Corridor, or else the” phrase has no
    significance and “that would violate the statutory construction principle to give
    meaning to all provisions.” 
    Id. Appellants’ argument
    proves too much. As they
    acknowledge, “any other action” is a “catch-all clause.” 
    Id. at 4.
    We find it
    difficult to believe that Congress would use a highly generalized “catch-all
    clause” to express its intent regarding a single, extremely specific issue—viz.,
    making the corridor available for transportation improvements. Indeed, in the
    Rocky Flats Act itself Congress issued detailed instructions regarding the
    20
    transportation improvements. See RFA § 3174(e). Consequently, it would be
    rather surprising if Congress decided to set out its intent regarding the corridor at
    length in one section and then in the next decided to use an abstract, amorphous
    phrase to refer solely to the corridor. In other words, Congress knew how to write
    “transportation improvements” in § 3174(e). Presumably, it knew how to write it
    as well in § 3175(d)(1)(B), if indeed that is what it meant there too. But it did not
    do so.
    Contrary to Appellants’ view that making the corridor available was the
    only action left for Energy that could be captured by the catch-all clause,
    arguably another way that one might view the clause as related to the corridor is
    if it refers to a larger category that includes actions concerning the corridor.
    Recall that the “or any other action” clause is framed to cover Energy’s
    undertakings at Rocky Flats aside from those related to “response actions.” RFA
    § 3175(d)(1)(B). The Rocky Flats Act defines “response action” with reference to
    the Comprehensive Environmental Response, Compensation, and Liability Act
    (“CERCLA”), 42 U.S.C. § 9601, and with reference to the Colorado Hazardous
    Waste Act. See RFA § 3173(6). In its supplemental brief, the Service describes
    other responsibilities that Energy “has had that are not fairly characterized as
    ‘response actions,’” such as the construction of dams and possibly actions
    ancillary to its environmental clean-up duties. Aplees.’ Supp. Br. at 4 & Ex. 1.
    21
    For our purposes, the pivotal point is not how accurate the Service’s listing of
    responsibilities is; rather, it is whether it is reasonable to infer that Congress
    could have been concerned about the possibility that Energy might have tasks to
    perform at Rocky Flats that were not necessarily enveloped by the term “response
    action,” as the RFA has defined it. And we think that inference is quite
    reasonable.
    In that regard, the transformation of Rocky Flats from a pollution-plagued
    former nuclear-weapons operation into a national refuge was an enormous
    undertaking that lasted decades and involved extensive collaboration between
    numerous state and federal agencies. Energy played a major role in that effort, as
    it had managed the land for many years prior. Even as Congress provided for the
    transfer of much of the area from Energy to the Service, it obviously foresaw a
    continued role for Energy, for it spelled out a number of duties Energy had left to
    discharge. In light of these facts, the proposition that it was possible that Energy
    might have responsibilities relating to Rocky Flats that were not sufficiently
    encompassed by the term “response actions” is, in our opinion, irrefutable.
    The remaining question, then, is whether making the corridor available can
    be regarded as falling into this category along with any other matters outside the
    “response action” bucket. We do not believe that it can. The catch-all phrase
    makes good sense as a precautionary measure to capture any duties Congress had
    22
    not specifically foreseen falling upon Energy but that Energy would need to
    perform. It makes far less sense as a reference to a specific issue—making the
    corridor available—that Congress not only foresaw but also addressed at some
    length in the RFA itself. Thus, we reject Appellants’ contention that the catch-all
    “or any other action” clause of § 3175(d)(1)(B) refers to the corridor and, more
    specifically, making it available.
    It is helpful to place the foregoing analysis within the context of Chevron.
    For § 3175(d)(1)(B) to alter the outcome, we must find that it is either (1) an
    unambiguous directive prohibiting the Service from conveying the corridor; or (2)
    evidence of congressional intent sufficient to render the Service’s interpretation
    unreasonable. Neither finding is justified. Far from being unambiguous,
    § 3175(d)(1)(B) speaks in extraordinarily broad, vague language that has no
    obvious or explicit connection to the corridor, or to the Service’s powers with
    respect to the corridor. As for Chevron step two, given the many aforementioned
    reasons for concluding that the Service’s interpretation is reasonable, we do not
    believe that § 3175(d)(1)(B) can establish its unreasonableness.
    For all of the reasons discussed above, we reject Appellants’ argument that
    the Service lacked the authority to convey the corridor under the Rocky Flats
    Act. 10
    10
    Appellants observe that the Service earlier understood the Rocky
    (continued...)
    23
    B
    Appellants believe the Service violated NEPA with respect to three main
    factual areas: (1) contaminated soils; (2) air pollution; and (3) the Preble’s
    Meadow Jumping Mouse. They do not adequately show a NEPA violation in any
    of these areas.
    1
    In NEPA, Congress codified rules designed to “focus[] both agency and
    public attention on the environmental effects of proposed actions” and thereby
    “facilitate[] informed decisionmaking by agencies and allow[] the political
    process to check those decisions.” N.M. ex rel. Richardson v. Bureau of Land
    Mgmt., 
    565 F.3d 683
    , 703 (10th Cir. 2009). The Act does so in two ways: “First,
    it places upon an agency the obligation to consider every significant aspect of the
    environmental impact of a proposed action. Second, it ensures that the agency
    will inform the public that it has indeed considered environmental concerns in its
    10
    (...continued)
    Flats Act to endow Energy with the exclusive authority to convey the corridor.
    However, the Service’s statements that Appellants point to in making their case
    for agency inconsistency were all either made before the Flats was transferred to
    the Service and established as a refuge, or simply recite the indisputable fact that
    the Rocky Flats Act gave Energy the authority to convey the land before the
    establishment of the refuge. The statements are therefore entirely irrelevant to
    the question of whether the Service had the authority to transfer the land after it
    assumed administrative jurisdiction over it, and that is the only question before
    us. Thus, assuming arguendo that they are legally relevant, Appellants’ claims of
    agency inconsistency have no factual basis in the record.
    24
    decisionmaking process.” 
    Wyoming, 661 F.3d at 1236
    –37 (quoting Forest
    Guardians v. U.S. Fish & Wildlife Serv., 
    611 F.3d 692
    , 711 (10th Cir. 2010))
    (internal quotation marks omitted). The Supreme Court has made clear that
    “NEPA itself does not mandate particular results, but simply prescribes the
    necessary process.” Robertson v. Methow Valley Citizens Council, 
    490 U.S. 332
    ,
    350 (1989).
    Under NEPA, federal agencies must prepare an EIS whenever they
    undertake “major Federal actions significantly affecting the quality of the human
    environment.” 42 U.S.C. § 4332(C). To determine whether an impact statement
    is warranted, an agency generates an EA, 40 C.F.R. § 1501.4(b), a “concise public
    document . . . that serves to . . . [b]riefly provide sufficient evidence and analysis
    for determining whether to prepare an [EIS] or a [FONSI],” 
    id. § 1508.9(a)(1).
    The assessment must “include brief discussions of the need for the proposal, of
    alternatives . . . , [and] of the environmental impacts of the proposed action and
    alternatives.” 
    Id. § 1508.9(b).
    As such, an EA must consider “the cumulative
    impacts of a project,” Davis v. Mineta, 
    302 F.3d 1104
    , 1125 (10th Cir. 2002), as
    well as its “indirect effects,” Airport Neighbors Alliance, Inc. v. United States, 
    90 F.3d 426
    , 433 (10th Cir. 1996). Distilled to its essence, “[t]he EA is a rough-cut,
    low-budget [EIS] designed to show whether a full-fledged [EIS]—which is very
    costly and time-consuming to prepare and has been the kiss of death to many a
    25
    federal project—is necessary.” Spiller v. White, 
    352 F.3d 235
    , 237 (5th Cir.
    2003) (quoting Sabine River Auth. v. U.S. Dep’t of Interior, 
    951 F.2d 669
    , 677
    (5th Cir. 1993)) (internal quotation marks omitted).
    If the EA leads to the conclusion that no impact statement is necessary, the
    agency also creates a FONSI, 40 C.F.R. § 1501.4(e), “a document . . . briefly
    presenting the reasons why an action . . . will not have a significant effect on the
    human environment and for which an [EIS] therefore will not be prepared,” 
    id. § 1508.13.
    The Service in this case issued an EA and FONSI rather than an impact
    statement, a decision Appellants contest.
    2
    “An agency’s decision to issue a FONSI and not prepare an EIS is a factual
    determination which implicates agency expertise.” Greater Yellowstone Coal. v.
    Flowers, 
    359 F.3d 1257
    , 1274 (10th Cir. 2004) (quoting Utah Shared Access
    Alliance v. U.S. Forest Serv., 
    288 F.3d 1205
    , 1213 (10th Cir. 2002)) (internal
    quotation marks omitted). We therefore ask “whether the agency acted arbitrarily
    and capriciously in concluding that the proposed action will not have a significant
    effect on the human environment.” 
    Id. (quoting Davis,
    302 F.3d at 1112)
    (internal quotation marks omitted). As a general principle, “the judiciary’s role in
    the NEPA context is merely to ensure that the federal agency takes a hard look at
    26
    the environmental consequences of its actions.” Middle Rio Grande Conservancy
    Dist. v. Norton, 
    294 F.3d 1220
    , 1225 (10th Cir. 2002). “[A] presumption of
    validity attaches to the agency action and the burden of proof rests with the
    appellants who challenge such action.” Prairie 
    Band, 684 F.3d at 1008
    (quoting
    
    Richardson, 565 F.3d at 704
    ) (internal quotation marks omitted). That said, “our
    review of an EA/FONSI has a substantive component as well as a component of
    determining whether the agency followed procedural prerequisites.” 
    Davis, 302 F.3d at 1112
    . “If the plaintiffs can demonstrate substantively that the [agency’s]
    conclusion of non-significant effect on the environment represents a ‘clear error
    of judgment,’ then that conclusion must be reversed.” 
    Id. (quoting Utah
    Shared
    Access 
    Alliance, 288 F.3d at 1213
    ).
    3
    a
    Appellants first assert that the Service had an obligation to prepare an
    impact statement in regards to soil contaminants, and in particular plutonium. As
    noted, an agency is compelled to complete an impact statement where its
    proposed action “may significantly affect the quality of the human environment.”
    
    Norton, 294 F.3d at 1224
    (emphasis added). The term “significantly” is defined
    in part with reference to “[t]he degree to which the proposed action affects public
    health or safety.” 40 C.F.R. § 1508.27(b)(2). In Appellants’ view, the parkway
    27
    potentially significantly affects the quality of the human environment because its
    construction will release dangerous levels of plutonium. They therefore assert
    that the Service was compelled to conduct an EIS concerning plutonium.
    In defense of its decision not to conduct a full-blown EIS with regard to
    plutonium, the Service relied (and continues to rely) on assurances it received
    from the EPA. More specifically, in 2006 the EPA certified that conditions in the
    area where the corridor would be situated were “acceptable for unrestricted use
    and unlimited exposure.” Aplts.’ App. at 132 (Corrective Action Decision,
    prepared Sept. 2006). 11 Five years later, at the Service’s request—and prior to its
    decision to enter into the land exchange—the EPA clarified that this clearance
    applied to the construction of the proposed parkway as well.
    In their opening brief, Appellants challenge the EPA’s advice as
    “inapplicable,” because it was supposedly premised on the assumption that no soil
    disturbance would take place, and thus did not account for the construction of a
    parkway. Aplts.’ Opening Br. at 31. This is arguably true of the 2006 report, but
    quite obviously not true of the 2011 letter, which explicitly addressed the
    parkway construction and explicitly confirmed that such construction posed no
    risk of exposing anyone to an unacceptable level of radioactive material.
    11
    Other state and federal agencies were involved in the preparation of
    this report. It is not disputed that the EPA played a major role in preparing the
    report and, more importantly, that it issued the subsequent clarification of the
    report, and those are the essential facts for our purposes.
    28
    There is no apparent impropriety in the Service’s use of the letter. NEPA
    itself instructs agencies that are deciding whether an impact statement is called
    for to make use of the “views of the appropriate Federal, State, and local
    agencies, which are authorized to develop and enforce environmental standards.”
    42 U.S.C. § 4332(C)(v). With respect to the plutonium issue here, the EPA is
    undeniably such an agency. See generally Waste Action Project v. Dawn Mining
    Corp., 
    137 F.3d 1426
    (9th Cir. 1998) (discussing the EPA’s role in regulating
    radioactive materials). Tacitly conceding these points, Appellants press two
    rebuttals: (1) the letter “was not subject to any of the formal procedures that
    accompany a CERCLA determination,” Aplts.’ Reply Br. at 11; and (2) it was
    based on flawed reasoning. 12
    The first argument is unsupported by any authority or elaboration, and is
    thus inadequately articulated to warrant our consideration of it. See Bronson v.
    Swensen, 
    500 F.3d 1099
    , 1104 (10th Cir. 2007) (“[W]e routinely have declined to
    consider arguments that are not raised, or are inadequately presented, in an
    appellant’s opening brief.”). At any rate, to the extent that we can discern its
    substance, the argument is unconvincing. As noted, NEPA encourages agencies
    12
    We do not understand Appellants to argue that the 2011 letter was
    not part of the EA; insofar as they believe that to be the case, they have
    insufficiently presented the contention. See United States v. Rodriguez-Aguirre,
    
    108 F.3d 1228
    , 1237 n.8 (10th Cir. 1997) (“[I]t is the appellant’s responsibility to
    tie the salient facts, supported by specific record citation, to [his] legal
    contentions.” (second alteration in original) (internal quotation marks omitted)).
    29
    to rely on the “views of the appropriate Federal, State, and local agencies, which
    are authorized to develop and enforce environmental standards.” 42 U.S.C.
    § 4332(C)(v). The statute does not limit itself to “views of requisite formality,”
    and we are reluctant to insert language where Congress has elected not to. See,
    e.g., Marchetti v. United States, 
    390 U.S. 39
    , 60 n.18 (1968) (noting that courts
    should not insert words into statutes that their drafters omitted); see also
    Biodiversity Conservation Alliance v. U.S. Forest Serv., 
    765 F.3d 1264
    , 1270
    (10th Cir. 2014) (“NEPA grants substantial discretion to an agency to determine
    how best to gather and assess information.”). Furthermore, the 2011 EPA letter is
    reasonably read as a clarification and elaboration of the 2006 report; the letter
    extrapolates from the 2006 findings to explain the risk to construction workers.
    As such, it was reasonable of the Service to regard the letter as, in essence, a
    continuation of the CERCLA process that the EPA had begun several years
    earlier. Consequently, any difference in formality between the 2011 letter and the
    2006 report is not dispositive, and certainly does not demonstrate any arbitrary or
    capricious conduct on the Service’s part.
    Appellants’ second objection to the 2011 letter—that its reasoning is
    flawed—is even less substantial. They complain that the letter “equates a wildlife
    refuge worker . . . with construction workers,” even though the two are “not
    comparable.” Aplts.’ Reply Br. at 12 (emphasis added). But the letter does no
    30
    such thing. In the 2006 report, the EPA had considered the health risks associated
    with plutonium exposures of wildlife refuge workers, but had no occasion to
    examine such risks as to construction workers. However, in reaching its
    conclusion in the 2011 letter that the construction posed no risk of exposing
    anyone to an unacceptable level of radioactive material, the EPA explained that it
    took account of the difference between the two types of employees—“includ[ing]
    the potential for greater rates of inhalation and ingestion of soil by the
    construction worker”—but determined that the “differences are likely offset by
    the much greater exposure duration” for refuge workers, relative to construction
    workers who would just be exposed for “a few months.” Aplts.’ App. at 527
    (Letter from Carl Spreng to David Lucas, dated Sept. 21, 2011). The EPA’s logic
    is straightforward and comprehensible: although construction workers are likely
    to face greater exposures to plutonium than wildlife refuge workers, they will
    likely be exposed for much shorter periods of time and, therefore, the risks they
    face are essentially comparable to those of wildlife refuge workers, whom the
    EPA concluded faced acceptable levels of risk. We have no reason to doubt the
    EPA’s logic, nor to fault the Service for relying on it.
    Finally, Appellants articulate a highly detailed criticism of the EPA’s
    conclusion based on the supposed areas that were cleaned and the supposed levels
    of acceptable hazardous materials. Again, its criticism cannot be squared with the
    31
    contents of the 2011 letter. In the relevant section of the letter, the EPA indicated
    that it was addressing dangers to construction workers insofar as they would be
    working on a construction project related to “a future land transfer at the eastern
    edge of the site, as per provisions of the [Rocky Flats Act].” Aplts.’ App. at 527.
    In other words, the EPA specifically had in mind the project Appellants are now
    alleging would release a dangerous amount of radioactive material. And it
    specifically rejected the allegation that Appellants advance. For us to now
    second-guess its judgment and hold that the EPA was not in fact aware of the
    terms of its own analysis would be to “substitute our judgment for that of the
    agency’s,” and that we may not do. Ass’ns Working for Aurora’s Residential
    Env’t v. Colo. Dep’t of Transp., 
    153 F.3d 1122
    , 1130 (10th Cir. 1998).
    Recognizing the EPA’s authority in the pollutants arena, the Service reasonably
    consulted it and was given its approval to proceed. Simply put, the Service took a
    “hard look” at the relevant environmental conclusions reached by an expert
    agency, and we are in no position to disturb its decision with regard to soil
    contaminants.
    b
    Appellants next discern NEPA violations in the Service’s failure to take “a
    ‘hard look’ at ozone[, i.e., smog,] and nitrogen dioxide pollution,” and in its
    “fail[ure] to support its conclusion that these air quality impacts will be
    32
    insignificant.” Aplts.’ Opening Br. at 32. Neither contention justifies reversal.
    i
    Appellants believe that the Service failed to adequately consider the
    impacts the construction of the parkway would have on smog, despite having
    ample data on the issue at hand, by choosing to rely on state studies. They clarify
    in their reply brief that their objection to the Service’s reliance on the state
    studies is chiefly that the studies relied on purportedly outdated EPA air quality
    standards. In 2008, the EPA revisited those standards and Appellants insist that
    the Service should have utilized the new standards.
    This argument does not survive the rigor of an arbitrary-and-capricious
    review. The Service avers that the 2008 rules had not yet been implemented
    when the EA was being prepared and Appellants do not dispute that fact. See
    Implementation of the 2008 National Ambient Air Quality Standards for Ozone,
    77 Fed. Reg. 30,160, 30,161 (May 21, 2012) (noting that the “EPA deferred initial
    designation of areas for the 2008 ozone NAAQS” and only proposed rulemaking
    to “address the classifications and attainment deadlines” in February 2012).
    Therefore, Appellants’ argument is essentially that the Service acted arbitrarily
    and capriciously in relying on studies predicated on then-prevailing standards
    promulgated by the nation’s leading environmental agency, simply because new
    standards were forthcoming. Not surprisingly, they have no caselaw to support
    33
    that proposition. Appellants fail to overcome the “presumption of validity” that
    “attaches to the agency action.” Prairie 
    Band, 684 F.3d at 1008
    (quoting
    
    Richardson, 565 F.3d at 704
    ) (internal quotation marks omitted). There was no
    NEPA violation with respect the Service’s reliance on the state studies.
    ii
    Appellants also fault the Service for not sufficiently analyzing—or
    disclosing—the emissions that would result from the construction of the parkway.
    In its EA, the Service noted that the parkway project would be required to comply
    with current and future air quality standards. Ultimately, Appellants have no
    good explanation as to why it was inadequate of the Service to rely on the fact
    that the parkway project would be subject to continuing environmental
    requirements. Appellants’ largely unsubstantiated position is also complicated by
    a more fundamental question regarding what the proposed federal action here is.
    Though Appellants’ briefing could be read to imply that the federal action being
    challenged is the construction of the parkway, they acknowledged at oral
    argument that the construction is really just a consequence of the action under
    attack, which is—understood in its most reasonable terms—only the land
    exchange. Although the distinction may be a technical one, since Appellants
    fairly regard the exchange and the parkway as closely related, it is nevertheless a
    distinction that tips the scales in the Service’s favor because we are called upon in
    34
    part to determine whether the level of detail that the Service offers regarding the
    environmental effects of the parkway’s construction—here, effects relating to
    emissions—is reasonable. Seemingly, were the federal action the parkway
    construction itself, rather than the land exchange, the Service would have had
    access to a far more detailed actual construction plan than the hypothetical plan
    that the Service had before it during the NEPA process. Such a plan would have
    provided the foundation for a more extensive environmental analysis regarding
    the parkway’s construction, including emissions.
    All of this is enough to mean that the Service gets the benefit of the doubt
    in relying on future regulation and compliance for a parkway that (at least at
    material times) was not yet a reality. In this same vein, Intervenors’ 13 detailed
    explication of the battery of state and federal environmental hoops the parkway
    will have to jump through before it can come into being adds even further weight
    to the Service’s approach here. At the end of the day, the only rejoinder
    Appellants have is that “[n]one of these studies or commitments were relied upon
    in [the Service’s] decision-making documents, none are directly enforceable by
    [the Service], and none were imposed . . . as conditions of the land exchange.”
    Aplts.’ Reply Br. at 10 n.5. But the Service did fundamentally rely on the
    13
    Intervenors are comprised of Jefferson County, the City of Arvada,
    the Jefferson Parkway Public Highway Authority, the Colorado Natural Resource
    Trustees, and the Colorado State Board of Land Commissioners.
    35
    supposition that the parkway would have to obtain environmental clearances that
    would ensure its compliance with the same laws and standards the Service itself
    would have considered if it were directly approving the construction of the
    parkway itself. See Klein v. U.S. Dep’t of Energy, 
    753 F.3d 576
    , 583 (6th Cir.
    2014) (finding an EA sufficient, in part, based on its discussion of “future
    requirements the [proposed action] will have to meet to secure construction and
    operation permits” because those permits would need to be obtained “before
    construction and operation (and the resulting environmental impacts) could
    begin”).
    It is also significant that Congress imposed on the transportation
    improvement plan the requirement that it be “included in the regional
    transportation plan of the metropolitan planning organization designated for the
    Denver metropolitan area.” RFA § 3174(e)(2)(B)(ii). This occurred with respect
    to the parkway project. As required by federal law, the planning organization
    verified that each of its undertakings—the parkway included—would meet federal
    emissions standards. See 23 U.S.C. § 134(i)(3). The Service was thus on solid
    ground in relying on procedures for future environmental oversight, as Congress
    specifically provided an important mechanism in that regard.
    iii
    Turning to Appellants’ next contention, they maintain that the Service’s
    36
    treatment of nitrogen dioxide emissions from vehicles on the proposed parkway
    violated NEPA in the following respects: (1) it failed to quantify emissions; (2) it
    omitted “an alternative qualitative description of the public health impacts
    associated with” emissions; and (3) it failed to consider whether emissions would
    comply with a nitrogen dioxide standard adopted by the EPA in 2010. Aplts.’
    Opening Br. at 32. In response, the Service argues that the evolving nature of the
    EPA standards regarding nitrogen dioxide made it impractical to fully consider
    the matter in its EA and made it more appropriate to rely on local government to
    ensure that any transportation projects comply with national benchmarks.
    Appellants’ attack on the Service’s explanation is twofold: (1) “agencies
    cannot avoid NEPA significance by claiming impacts are unclear or require
    additional study”; and (2) modeling of nitrogen dioxide emissions is available.
    Aplts.’ Opening Br. at 38. Both of these assertions imply that the Service refused
    to consider nitrogen dioxide impacts because of difficulties assembling the
    pertinent data. That is not, however, why it left the impacts out of its EA.
    Rather, it did so because the forthcoming legal standards had not yet been
    promulgated. See Aplts.’ App. at 474 (“In the absence of final standards and
    guidance, modeling how current, approved regional transportation plans comply
    with the new standards for these pollutants would be difficult at best.” (emphasis
    added)); see also Primary National Ambient Air Quality Standards for Nitrogen
    37
    Dioxide, 75 Fed. Reg. 6474, 6520 (Feb. 9, 2010) (stating that “initial [nitrogen
    dioxide] designations” would be promulgated by January 2012). What Appellants
    need—and what they completely lack—is any authority or tenable argument on
    why it was arbitrary or capricious for the Service to rely on the future
    commitments of state and local entities in the absence of clear nitrogen dioxide
    guidelines from the EPA. Given that void of argument and authority, their
    nitrogen dioxide claim fails.
    c
    Appellants contend that the Service violated NEPA in its EA with respect
    to its treatment of the Preble’s Meadow Jumping Mouse in various ways, each of
    which is discussed below.
    i
    In Appellants’ view, the Service’s “discussion of the no action alternative
    was deficient.” Aplts.’ Opening Br. at 44 (capitalization removed). A no-action
    analysis “compare[s] the potential impacts of the proposed major federal action to
    the known impacts of maintaining the status quo.” Custer Cnty. Action Ass’n v.
    Garvey, 
    256 F.3d 1024
    , 1040 (10th Cir. 2001). Appellants begin this section of
    their brief with the statement that “NEPA requires agencies to evaluate a ‘no
    action’ alternative to provide an environmental baseline.” Aplts.’ Opening Br. at
    44 (citing 40 C.F.R. § 1502.14(d)). Here, though, there was no such requirement.
    38
    We have explained that § 1502.14 applies only to the EIS preparation process, not
    to the preparation of EAs, and that a no-action analysis is therefore not
    automatically necessary when an agency does only the latter. See W. Watersheds
    Project v. Bureau of Land Mgmt., 
    721 F.3d 1264
    , 1274 (10th Cir. 2013).
    Even though “the absence of a detailed No Action analysis by itself does
    not render” an EA and its resulting FONSI arbitrary or capricious, 
    id. at 1274,
    a
    plaintiff may in some circumstances demonstrate “that the absence of a No Action
    analysis compromised the EA so severely as to render the FONSI arbitrary and
    capricious,” 
    id. at 1275.
    The question of whether the Service’s no-action analysis passes muster
    turns on the nature of the various parcels involved in the land exchange.
    According to the terms of the exchange, the Service acquired the surface, sand,
    and gravel rights to Section 16 (acquired from the State of Colorado) and all of
    the land in Section 3 (acquired from Energy). With respect to these parcels,
    Appellants first complain that “[t]he agency failed to disclose the current status of
    Mouse habitat on” either section “and thus the EA omits the benchmark against
    which the Land Exchange can be judged.” Aplts.’ Opening Br. at 44–45. In fact,
    the EA noted that “section 16 contains some riparian habitat that is considered
    suitable for [the] mouse,” Aplts.’ App. at 457, and the draft EA that was
    circulated for public comment described the land acquired in the
    39
    exchange—which included Section 16—as “very important” to the mouse,
    Aplees.’ J. Supp. App. at 227 (Draft Envtl. Assessment, prepared Sept. 2011).
    Short though these discussions may be, they undermine Appellants’ insistence
    that the EA “failed to disclose the current status of Mouse habitat on the Section
    16 property,” Aplts.’ Opening Br. at 44–45, and thus weaken the underlying
    premise of their position.
    Taking a related tack, Appellants fault the Service for failing to disclose
    that the habitat within Sections 3 and 16 had been conserved; as a result, they
    reason, the exchange gave the mouse nothing, because it was already protected in
    the land acquired by the Service in the exchange. 14 The Service responds that
    “[t]he fact that the Mouse habitat in Sections 3 and 16 already had some legal
    protections . . . does not undercut the stated benefit of permanently placing the
    land in federal ownership.” Aplees.’ Br. at 57–58. We agree. In particular, the
    government notes that the conservation lease on Section 16 would have been
    14
    Appellants argue in passing in their section on mitigation measures
    (which are discussed infra) that Section 16 contains no habitat essential to the
    mouse because the Service did not designate any land within it critical habitat.
    Because Appellants do not make this argument with respect to the no-action
    analysis, there is no need to address it here. In addition, we have no reason to
    believe that this alleged fact renders the Service’s no-action analysis
    automatically arbitrary and capricious. The Service stated why it considered
    Section 16 to be suitable habitat for the mouse, and it was reasonable—for no-
    action purposes—for the Service to consider the acquisition of 104 acres of mouse
    habitat worth the sacrifice of 12.4 acres (of 35,000 total acres) of critical habitat,
    regardless of whether or not the 104 was critical or just suitable habitat.
    40
    extinguished in the event the parcel was sold. Appellants do not dispute that
    assertion. Thus, accepting this statement as true, the exchange did offer the
    mouse a greater level of protection on Section 16. An agency’s duty to “inform
    the public that it has indeed considered environmental concerns in its
    decisionmaking process,” 
    Wyoming, 661 F.3d at 1236
    (internal quotation marks
    omitted), cannot plausibly be read to encompass environmental concerns that it
    reasonably understands will not affect the bottom-line conservation calculus.
    With those background points in mind, there is evidence in the
    administrative record that the acquisition of Section 16 brought into the federal
    government’s control 104 acres of suitable mouse habitat. 15 In return, the Service
    gave up approximately 12.4 acres of critical mouse habitat. Utilizing the “highly
    deferential” standard that we must, W. Watersheds 
    Project, 721 F.3d at 1273
    , and
    trusting the Service’s expertise, 
    Flowers, 359 F.3d at 1274
    , we uphold the
    Service’s cost-benefit analysis.
    ii
    15
    The Service does not contend that a precise assessment of how much
    suitable mouse habitat Section 16 contains was circulated for public comment
    prior to the execution of the exchange. But the draft EA that was circulated for
    public comment clearly indicated that the corridor had 12.4 acres of critical
    mouse habitat, and indicated that the land acquired in the exchange—which
    included Section 16—contained land “considered very important” to the mouse.
    Aplees.’ J. Supp. App. at 227. Thus, the Service considered and presented to the
    public the essential thought process regarding the mouse that led it to accept the
    exchange: that it was, in the totality of circumstances, better for the mouse, not
    worse.
    41
    Lastly, Appellants assert that the Service violated NEPA by not specifically
    addressing the acquired properties as “mitigation measures” for the exchange.
    However, in our view, Appellants misunderstand the Service’s reasons for
    discussing the acquired properties in the EA. They were not mitigation measures
    at all. We begin by explaining the function of mitigation measures in the NEPA
    setting.
    An agency “can decline to prepare an EIS even if it finds a potentially
    significant impact so long as it also finds ‘changes or safeguards in the project
    sufficiently reduce the impact to a minimum.’” Hillsdale Envtl. Loss Prevention,
    Inc. v. U.S. Army Corps of Eng’rs, 
    702 F.3d 1156
    , 1172 (10th Cir. 2012) (quoting
    Mich. Gambling Opposition v. Kempthorne, 
    525 F.3d 23
    , 29 (D.C. Cir. 2008)).
    These “changes or safeguards” constitute “mitigation measures” in the EA context
    and may negate the need to prepare an EIS. 
    Id. However, an
    EA need only
    explore mitigation measures where it acknowledges the possibility that the agency
    action will cause environmental harm; the EA does so as a means of determining
    the extent to which the harm may be balanced out. See, e.g., O’Reilly v. U.S.
    Army Corps of Eng’rs, 
    477 F.3d 225
    , 234 (5th Cir. 2007) (discussing an EA that
    listed mitigation measures because it also “list[ed] the potentially significant
    adverse impacts” of the project). This stands to reason. An EA obviates the need
    for an EIS when the agency finds that the action “will not have a significant effect
    42
    on the human environment.” 40 C.F.R. § 1508.13. It would make no sense to
    demand an articulation of mitigation measures when there is no anticipated harm
    to mitigate.
    By contrast, an EIS presupposes the existence of significant environmental
    effects—that is, such effects are its raison d’être, see, e.g., Utah Shared Access
    Alliance v. Carpenter, 
    463 F.3d 1125
    , 1131 (10th Cir. 2006); consequently, an
    EIS must include a discussion of mitigation measures, see San Juan Citizens
    Alliance v. Stiles, 
    654 F.3d 1038
    , 1053 (10th Cir. 2011) (“[A]n EIS must
    . . . discuss ‘steps that can be taken to mitigate [a project’s] adverse
    environmental consequences.’” (second alteration in original) (quoting 
    Robertson, 490 U.S. at 351
    )).
    Applying that framework, the Service was only required to include
    mitigation measures in its EA if it forecast a significant impact resulting from the
    exchange. The EA made no such forecast. Rather, as the Service rightly
    observes, the EA discussed the acquisition of Sections 3 and 16 (and the other
    parcels transferred to the Service under the deal) as part of the proposed agency
    action, not as a mitigation measure to compensate for some separate action. It is
    therefore appropriate that the EA omitted any section with the word “mitigation”
    in the title, and Appellants’ mitigation arguments do not entitle them to relief.
    iii
    43
    It is Appellants’ position that the Service ran afoul of NEPA when it
    shielded from public notice and comment the documents the EA relied upon for
    its statements regarding the mouse. When preparing an EA, an “agency shall
    involve . . . the public . . . to the extent practicable.” 40 C.F.R. § 1501.4(b).
    Plainly, this language affords an agency “considerable discretion to decide the
    extent to which such public involvement is ‘practicable.’” Brodsky v. U.S.
    Nuclear Regulatory Comm’n, 
    704 F.3d 113
    , 121 (2d Cir. 2013); see Taxpayers of
    Mich. Against Casinos v. Norton, 
    433 F.3d 852
    , 861 (D.C. Cir. 2006) (observing
    that an agency enjoys “significant discretion in determining when public comment
    is required with respect to EAs”); see also 
    Flowers, 359 F.3d at 1279
    (“NEPA’s
    public involvement requirements are not as well defined when an agency prepares
    only an EA and not an EIS.”).
    Our Flowers decision compels a finding that the Service acted well within
    the confines of this substantial discretion. There, we upheld an agency against a
    similar challenge where it failed to circulate for public comment various
    documents supporting its environmental 
    assessment. 359 F.3d at 1279
    . One of
    those documents was a biological opinion, the very document that Appellants
    focus on here. 
    Id. Rejecting the
    appellants’ argument in Flowers, we emphasized
    that the circulated notice indicated that the project would likely affect bald eagles,
    the species at issue, and found that sufficient to satisfy the public-involvement
    44
    aspect of NEPA under the circumstances. 
    Id. The logic
    of Flowers applies a fortiori to the instant appeal. In Flowers,
    the assessment itself was never circulated, 
    id., which was
    not the case here. And,
    just as in Flowers, the circulated notice did mention the possibility of impacts on
    the mouse, and the notice was presumably sufficient since the comments
    themselves then brought the issue up. Thus, there is even more reason here to
    uphold the agency action than in Flowers. In sum, Appellants fail to disturb the
    “presumption of validity [that] attaches to the agency action.” Prairie 
    Band, 684 F.3d at 1008
    (quoting 
    Richardson, 565 F.3d at 704
    ) (internal quotation marks
    omitted).
    iv
    In Appellants’ opinion, the Service’s decision to conduct an intra-agency
    consultation regarding the potential effect of the parkway on the mouse
    “undermines [its] NEPA findings on the same agency action,” Aplts.’ Opening Br.
    at 41, because a formal consultation only occurs when an action is “likely to
    adversely affect” a species and that very finding required the Service to also
    prepare a full EIS and not just an EA, 
    id. (quoting 50
    C.F.R. § 402.13).
    Appellants have no authority to support the proposition that once an agency
    initiates the consultation process it is precluded from issuing an EA rather than an
    EIS. Under our binding precedent, that is clearly not the case. See Flowers, 
    359 45 F.3d at 1265
    , 1276 (upholding an agency’s decision to prepare only an EA despite
    the fact that it initiated—and reinitiated—consultation with the Service); cf. Cold
    Mountain v. Garber, 
    375 F.3d 884
    , 893 (9th Cir. 2004) (affirming an agency’s
    decision not to prepare an EIS in part because it engaged in consultation with the
    Service beforehand). Accordingly, Appellants do not demonstrate a NEPA
    violation on this ground.
    v
    Appellants contend that the Service violated NEPA by relying on the first
    biological opinion, when its decision to get a second opinion reveals the first to
    be inadequate. However, as the district court before us held, the two biological
    opinions reach the same ultimate conclusion: that the land exchange did not
    jeopardize the continued existence of the mouse. It is entirely unclear how the
    fact of the reinitiation and subsequent biological opinion has any bearing on the
    Service’s decision to forgo an impact statement, and Appellants offer no
    assistance in detecting such a connection.
    For all of these reasons, we reject Appellants’ NEPA claim.
    C
    Having disposed of Appellants’ NEPA claim, we now take up their ESA
    argument. The entirety of Appellants’ ESA-based argument is premised on the
    notion that “[the Service] unlawfully failed to issue [a take statement] for the land
    46
    exchange.” Aplts.’ Opening Br. at 52 (emphasis added) (capitalization
    removed). 16
    An agency is required to consult with the Service under the ESA whenever
    it plans to take an action that “may affect” a threatened species or its critical
    habitat. 50 C.F.R. § 402.14(a). As a culminating act of the consultation process,
    the Service “formulates a biological opinion.” Rio Grande Silvery Minnow v.
    Bureau of Reclamation, 
    601 F.3d 1096
    , 1105 (10th Cir. 2010); see 50 C.F.R. §
    402.14(g)(4) (noting that the Service is responsible “during formal consultation”
    for “[f]ormulat[ing] its biological opinion”). A biological opinion is “a written
    statement determining whether the proposed action ‘is likely to jeopardize the
    continued existence of listed species.’” Rio Grande Silvery 
    Minnow, 601 F.3d at 1105
    (quoting 50 C.F.R. § 402.14(g)(4)).
    The Service is also charged during the consultation process with
    “formulat[ing] a statement concerning incidental take, if such take may occur.”
    16
    See also Aplts.’ Opening Br. at 16 (“[The Service] failed to issue the
    mandatory [take statement] for the Land Exchange.” (emphasis added)); 
    id. at 53
    (“As detailed below, [the Service] had a mandatory duty to issue [a take
    statement] for the Land Exchange.”); 
    id. at 56
    (“[The Service’s] Consultation
    Handbook dictates that [a take statement] was mandatory in connection with the
    Land Exchange.”); 
    id. (“By not
    issuing [a take statement], [the Service] failed to
    ensure the Mouse will be protected from the Land Exchange.”); Aplts.’ Reply Br.
    at 25 (“[The Service] violated the [ESA] by not issuing an incidental take
    statement.” (capitalization removed)); 
    id. (noting the
    Service’s “failure to issue [a
    take statement] for the Land Exchange”); 
    id. at 26
    (“[T]he ESA requires, in no
    uncertain terms, that [the Service] issue [a take statement] for the Land Exchange
    now.”).
    47
    50 C.F.R. § 402.14(g)(7) (emphases added); see 16 U.S.C. § 1536(b)(4)(i)
    (providing that the Service “shall provide the Federal Agency . . . with a written
    statement that . . . specifies the impact of such incidental taking on the species”);
    50 C.F.R. § 4012.14(i)(1) (noting that an incidental take statement “[s]pecifies the
    impact, i.e., the amount or extent of such incidental taking on the species”). “The
    term ‘take’ means to harass, harm, pursue, hunt, shoot, wound, kill, trap, capture,
    or collect, or to attempt to engage in any such conduct.” 16 U.S.C. § 1532(19);
    accord Rio Grande Silvery 
    Minnow, 601 F.3d at 1106
    n.4.
    The take statement is “a permit authorizing the action agency to ‘take’ the
    endangered or threatened species so long as it respects the Service’s terms and
    conditions.” Bennett v. Spear, 
    520 U.S. 154
    , 170 (1997) (internal quotation
    marks omitted). “In those cases where the Service concludes that an action (or
    the implementation of any reasonable and prudent alternatives) and the resultant
    incidental take of listed species will not violate [the ESA], . . . the Service will
    provide with the biological opinion a statement concerning incidental take . . . .”
    50 C.F.R. 402.14(i)(1) (emphases added) (citations omitted); see Rio Grande
    Silvery 
    Minnow, 601 F.3d at 1106
    (describing the conditions under which an
    incidental take statement may be issued).
    As noted, Appellants’ ESA argument is predicated solely on the assertion
    that the Service unlawfully failed to issue an incidental take statement regarding
    48
    the land exchange. We reject this contention. At the outset, we observe that
    arguably the Service was not legally required to issue an incidental take statement
    at all for the land exchange. This is because, in the course of issuing two
    biological opinions indicating that the exchange would not jeopardize the
    continued existence of the mouse or adversely modify its critical habitat, the
    Service expressly stated that it “anticipate[d] that the proposed land exchange will
    not result in incidental take of the [mouse].” Aplts.’ App. at 365 (Biological Op.,
    prepared Nov. 17, 2011).
    The plain terms of the statute and regulations suggest that, at least where
    there is no evidence that a take may occur, the Service need not issue an
    incidental take statement. See Ariz. Cattle Growers’ Ass’n v. U.S. Fish & Wildlife
    Serv., 
    273 F.3d 1229
    , 1241 (9th Cir. 2001) (endorsing the view that “the plain
    language of the ESA does not dictate that the [Service] issue an Incidental Take
    Statement irrespective of whether any incidental takings will occur”); 50 C.F.R. §
    402.14(g)(7) (noting that the Service is tasked with “formulat[ing] a statement
    concerning incidental take, if such take may occur” (emphases added)); see also
    Defenders of Wildlife v. U.S. Dep’t of Navy, 
    733 F.3d 1106
    , 1122–23 (11th Cir.
    2013) (noting that because the “biological opinion concluded that no take of listed
    species is likely to occur from” the agency action at issue, “no incidental take
    statement was required”); cf. Ariz. Cattle Growers’ 
    Ass’n, 273 F.3d at 1240
    –41
    49
    (rejecting the Service’s argument that “it should be permitted to issue an
    Incidental Take Statement whenever there is any possibility, no matter how small,
    that a listed species will be taken”). We need not definitively opine on this
    interpretive point, however. Because, even if the Service was obliged for some
    reason to issue an incidental take statement as to the land exchange, we find
    evidence in this record that it sufficiently did so—evidence that Appellants do not
    bother to acknowledge, much less rebut.
    In this regard, both biological opinions contain a section clearly labeled
    “incidental take statement.” See Aplts.’ App. at 364; 
    id. at 574
    (Biological Op.,
    prepared Feb. 14, 2012). In the first biological opinion, though noting that it
    “anticipate[d] that the proposed land exchange w[ould] not result in incidental
    take of [the mouse],” the Service explicitly recognized that the related “use of the
    300-foot strip of land . . . may result in take, and the project proponent will be
    required to obtain incidental take coverage . . . when a project has been defined
    and proposed.” 
    Id. at 365.
    The second opinion is of a similar stripe but provides
    greater detail: it indicates that the construction of the parkway, “which is
    interdependent upon [the] proposed land exchange, will result in the incidental
    take of 12.4 acres of . . . mouse habitat and in the take of no more than one
    individual mouse.” 
    Id. at 575
    (emphasis added).
    Appellants offer no reason for us to consider these passages as anything
    50
    other than what they purport to be: incidental take statements pertaining to the
    land exchange. 17 Consequently, we hold that even if the Service was required to
    issue an incidental take statement with respect to the land exchange, Appellants
    have not established on this record that the Service has not sufficiently done so.
    Accordingly, we uphold the district court’s judgment regarding Appellants’ ESA
    claim. 18
    17
    In a letter of supplemental authority, Appellants endeavor to rely
    upon Public Employees for Environmental Responsibility v. Beaudreu, 25 F.
    Supp. 3d 67 (D.D.C. 2014), to support their argument regarding the incidental-
    take-statement issue. They note that the district court in Beaudreu rejected the
    government’s suggestion that the possibility of reconsultation mooted the need for
    a take statement. Here, though, the fundamental problem with Appellants’
    position is that the record contains two biological opinions with respective
    sections entitled “incidental take statement,” and Appellants have given us no
    reason to suppose that they are anything other than take statements. In the cited
    section of Beaudreu, see 
    id. at 114–15,
    the court does not indicate that there were
    any similar documents in that record, so the case cannot help Appellants
    overcome this hurdle.
    18
    Appellants assert in passing that “[The Service] failed to limit the
    amount of take, identify mandatory terms and conditions to minimize harm, and
    impose requirements for monitoring and reporting.” Aplts.’ Opening Br. at 57.
    This argument too is explicitly tied to Appellants’ unsubstantiated claim that the
    Service failed to issue a take statement, as they conclude their point shortly
    thereafter with the following statement: “In short, [the Service] undermined the
    purpose of [a take statement] by not issuing one for the Land Exchange.” 
    Id. Accordingly, because
    it is without footing in the record, this assertion need not be
    addressed. However, it is worth noting that the reason the biological opinions
    omitted some of these specific terms is because the entities building the parkway
    “will be required to obtain incidental take coverage . . . when a project has been
    defined and proposed.” Aplts.’ App. at 575. Appellants provide no meaningful
    reasoning to explain why it was arbitrary and capricious for the opinions to take
    this approach. Cf. Defenders of 
    Wildlife, 733 F.3d at 1123
    –24 (holding that “it
    (continued...)
    51
    D
    Appellants seek leave to file a supplemental appendix. The Service
    opposes the motion but asks, in the event it is granted, to be allowed to file its
    own supplement. We conditionally allowed both parties to file their supplemental
    submissions but reserved the right to exclude them. Upon further consideration,
    we conclude that each of Appellants’ submitted documents could and should have
    been included in their original appendix if they wanted to rely upon them. See
    10th Cir. R. 30.1(A)(3) (“The court need not remedy any failure of counsel to
    provide an adequate appendix.”). We accordingly deny Appellants’ motion to file
    a supplemental appendix. As for the Service, its documents are only submitted in
    response to Appellants’, and since we are denying Appellants’ motion, we deny
    the Service’s as moot.
    IV
    For the reasons stated, we AFFIRM the judgment of the district court,
    18
    (...continued)
    was not arbitrary or capricious for the [agency] to postpone the issuance of an
    incidental take statement,” inter alia, because the “corresponding incidental take
    statement, which will pertain solely to operations on the [agency project], will
    serve no purpose while the [project] is still in the installation phase and no
    operations are actually occurring” (emphasis added)). See generally Ctr. for
    Biological Diversity v. Bureau of Land Mgmt., 
    698 F.3d 1101
    , 1126 (9th Cir.
    2012) (applying the arbitrary-and-capricious standard while evaluating the content
    of a take statement). Thus, to the extent Appellants could be understood to argue
    that the terms of the incidental take statements are insufficient, they fail to show
    that they are.
    52
    DENY Appellants’ motion to file a supplemental appendix, and DENY the
    Service’s motion to file a supplemental appendix as moot.
    53