Delaware Riverkeeper Network v. United States Army Corps of Engineers ( 2017 )


Menu:
  •                                  PRECEDENTIAL
    UNITED STATES COURT OF APPEALS
    FOR THE THIRD CIRCUIT
    _____________
    No. 17-1506
    _____________
    DELAWARE RIVERKEEPER NETWORK;
    MAYA VAN ROSSUM, the Delaware Riverkeeper,
    Petitioners
    v.
    UNITED STATES ARMY CORPS OF ENGINEERS,
    Respondent
    Tennessee Gas Pipeline Co.,
    Intervenor
    _____________
    On Petition for Review from the United States Army
    Corps of Engineers
    CENAP-OP-R-2015-0802-65
    Argued July 13, 2017
    Before: SMITH, Chief Judge, NYGAARD, and
    FUENTES, Circuit Judges
    (Filed: August 23, 2017)
    Aaron J. Stemplewicz                  [ARGUED]
    Delaware Riverkeeper Network
    925 Canal Street
    Suite 3701
    Bristol, PA 19007
    Counsel for Petitioners
    Varu Chilakamarri                   [ARGUED]
    United States Department of Justice
    Environment & Natural Resources Division
    P.O. Box 7415
    Washington, DC 20044
    Michael T. Gray
    United States Department of Justice
    Army Corps of Engineers
    701 San Marco Boulevard
    Jacksonville, FL 32207
    David C. Shilton
    United States Department of Justice
    Environment & Natural Resources Division
    P.O. Box 23795
    L’Enfant Plaza Station
    Washington, DC 20026
    2
    Counsel for Respondent
    Pamela S. Goodwin
    Saul Ewing
    650 College Road East
    Suite 4000
    Princeton, NJ 08540
    Patrick F. Nugent
    John F. Stoviak                     [ARGUED]
    Saul Ewing
    1500 Market Street
    Centre Square West, 38th Floor
    Philadelphia, PA 19102
    Elizabeth U. Witmer
    Saul Ewing
    1200 Liberty Ridge Drive
    Wayne, PA 19087
    Counsel for Intervenor Respondent
    ________________
    OPINION OF THE COURT
    ________________
    SMITH, Chief Judge.
    3
    Tennessee Gas Pipeline Co. (“Tennessee Gas”)
    submitted applications to several federal and state
    agencies seeking approval to build an interstate pipeline
    project. One such agency is the United States Army Corps
    of Engineers, 1 which administers certain provisions of the
    Clean Water Act. The Corps issued a permit approving the
    project. The petitioners, Maya van Rossum and Delaware
    Riverkeeper Network (collectively, “Riverkeeper”),
    challenge that decision on the ground that the Corps acted
    arbitrarily and capriciously by rejecting a “compression”
    alternative.
    We conclude that the Corps considered the
    compression alternative but rejected it for reasons
    supported by the record. While the compression
    alternative would disturb less land, its impact would be
    mostly permanent. The pipeline project would disturb
    more land, but its impact would be mostly temporary. In
    making a policy choice between those environmental
    tradeoffs, the agency’s discretion was at its apex. We will
    therefore deny the petition for review.
    1
    A companion case addresses challenges to the
    Pennsylvania Department of Environmental Protection,
    which granted a permit under state law approving the
    pipeline project. See Del. Riverkeeper Network v. Sec’y
    Pa. Dep’t of Envtl. Prot., No. 17-1533 (3d Cir. 2017).
    4
    I
    A
    At issue is the Orion Project—12.9 miles of pipeline
    looping2 that would transport an additional 135,000
    dekatherms per day of natural gas through Pennsylvania.
    Approximately 99.5% of the new pipeline would run
    alongside existing pipelines. According to Riverkeeper,
    construction will lead to deforestation, destruction of
    wetland habitats, and other forms of environmental
    damage. Riverkeeper asserts that such damage can be
    avoided by building or upgrading a compressor station.
    “Compressor stations . . . us[e] gas- and electric-powered
    turbines to increase the pressure and rate of flow at given
    points along the pipeline’s route.” Del. Riverkeeper
    2
    “Installation of ‘looping’ along a pipeline involves
    the construction of ‘additional sections of pipe, laid
    parallel to portions of the existing pipe, which empty into
    the existing pipe at both ends of the loop pipeline.’”
    Algonquin Gas Transmission Co. v. F.E.R.C., 
    948 F.2d 1305
    , 1309 n.4 (D.C. Cir. 1991) (further internal quotation
    marks omitted) (quoting ANR Pipeline Co. v. F.E.R.C.,
    
    771 F.2d 507
    , 510 (D.C. Cir. 1985)); see also Del.
    Riverkeeper Network v. Sec’y Pa. Dep’t of Envtl. Prot., 
    833 F.3d 360
    , 369 (3d Cir. 2016) (“‘Loops’ are sections of pipe
    connected to the main pipeline system that reduce the loss
    of gas pressure and increase the flow efficiency of the
    system.”).
    5
    Network v. Sec’y Pa. Dep’t of Envtl. Prot., 
    833 F.3d 360
    ,
    369 (3d Cir. 2016). Building or upgrading a compressor
    station would increase the amount of natural gas
    transported through existing pipelines and thus avoid any
    need to build pipeline looping.3
    Contrary to Riverkeeper’s concerns, the agencies
    concluded that the Orion Project would result in
    “minimal” and “temporary” environmental impact. Of the
    12.9 miles of pipeline looping, fewer than 2 miles would
    cross wetlands or waterbodies. The pipeline would be
    buried 2–3 feet beneath the ground, and all disturbed areas
    would be restored to their original elevations and contours
    with no net loss of wetlands. However, nearly five acres of
    forested wetlands would be de-forested and converted into
    emergent wetlands. The compression alternative, by
    contrast, would require constructing one or more
    permanent fixtures—causing permanent deforestation as
    well as light, air, sound, and greenhouse gas pollution.
    3
    The parties focus primarily on building one or more
    new compressor stations rather than upgrading an existing
    station. See JA 2010 (“[U]pgrades to existing compressor
    stations, without looping, did not offer the same reliability
    and flexibility on the system.”). We focus our analysis
    accordingly.
    6
    With that initial background in mind, we next set forth
    a brief overview of the administrative scheme and then
    describe how that process unfolded in this case.
    B
    Under the Natural Gas Act of 1938, the Federal Energy
    Regulatory Commission (“FERC”) is the “lead agency”
    for evaluating interstate pipeline projects. 15 U.S.C.
    § 717n(b). As part of that role, FERC performs a technical
    environmental analysis pursuant to the National
    Environmental Policy Act (“NEPA”). Id.
    NEPA requires FERC to take a “hard look” at the
    environmental impact of the proposed project. Robertson
    v. Methow Valley Citizens Council, 
    490 U.S. 332
    , 350
    (1989). If the project involves a “major Federal action”
    that would “significantly affect[] the quality of the human
    environment,” FERC must prepare a detailed
    Environmental Impact Statement. 
    42 U.S.C. § 4332
    (C).
    Otherwise, FERC need only prepare a concise
    Environmental Assessment. 
    40 C.F.R. §§ 1501.3
    , 1501.4,
    1508.13.
    As a condition of FERC’s approval, the applicant is
    required to obtain any additional state or federal licenses
    required by law. For example, because the Orion Project
    would discharge “dredged or fill material” into the “waters
    of the United States,” Tennessee Gas was required to
    7
    obtain a permit under Section 404 of the Clean Water Act.
    
    33 U.S.C. §§ 1344
    (a), 1362(7).
    The United States Army Corps of Engineers reviews
    applications for Section 404 permits. In doing so, the
    Corps applies the so-called Section 404 Guidelines (“the
    Guidelines”) issued by the Environmental Protection
    Agency. See 
    33 C.F.R. § 320.4
    . See generally Coeur
    Alaska, Inc. v. Se. Alaska Conservation Council, 
    557 U.S. 261
     (2009). Among other things, the Corps may not issue
    a permit where there is a “practicable alternative” with less
    adverse impact on the aquatic ecosystem, “so long as the
    alternative does not have other significant adverse
    environmental consequences.” 
    40 C.F.R. § 230.10
    (a).
    In performing its alternatives analysis, the Corps may
    rely on the environmental report prepared by FERC
    pursuant to NEPA. The agencies memorialized their
    cooperative relationship in a 2005 Memorandum of
    Understanding, which states that the Corps will “use the
    FERC record to the maximum extent practicable and as
    allowed by law . . . . [T]he Corps will give deference, to
    the maximum extent allowed by law, to the project
    purpose, project need, and project alternatives that FERC
    determines to be appropriate for the project.” JA 39. 4
    4
    The Memorandum of Understanding between FERC
    and the Corps supplements an Interagency Agreement
    between FERC and nine other federal agencies pursuant to
    8
    C
    1. Tennessee Gas’s application. On October 9, 2015,
    Tennessee Gas submitted an application to FERC for
    approval of the Orion Project. Its application included an
    Environmental Report, which discussed and rejected
    compression alternatives. Tennessee Gas explained that
    building compressor stations would require Tennessee Gas
    “to obtain approximately 40-acres per site (total of 80
    acres).” JA 408. Building compressor stations would also
    require “permanent vegetation clearing from the area in
    order to install permanent access roads, fencing, buildings
    and other appurtenance equipment,” and would create
    “light pollution and noise impacts and may also become a
    source of [greenhouse gas] emissions.” 
    Id.
     But with the
    Orion Project, “the new [right-of-way] will be allowed to
    re-vegetate to minimize and mitigate possible
    environmental impacts.” 
    Id.
     The report further concluded
    that the “compression alternative would result in higher
    Project operating and fuel costs.” Id.
    2. Public notice. On December 3, 2015, FERC issued a
    Notice of Intent and solicited public comments regarding
    the Orion Project. FERC specifically requested comments
    on “reasonable alternatives.” JA 560. On June 10, 2016,
    Executive Order 13212 (“Actions to Expedite Energy
    Related Projects,” May 18, 2001).
    9
    the Corps issued its own public notice of the Section 404
    permit application.
    3. FERC’s draft Environmental Assessment. In July
    2016, FERC circulated a non-public draft Environmental
    Assessment to the Corps for internal comment. The draft
    specifically considered and rejected a possible
    compression alternative, as conveyed in a detailed chart.
    While the draft Environmental Assessment concluded that
    compression would be “technically feasible,” its
    “economic efficiency” would be “lower” and it would
    “require permanent land use conversion” and present a
    new source of light, air emissions, and noise. JA 212. The
    draft characterized compression’s environmental impact
    as “different,” “comparable,” and “possibly lower” than
    the Orion Project. But ultimately, the draft concluded that
    the aboveground footprint of building a compression
    station is “permanent,” whereas “the bulk of the Project
    impacts are temporary (such as waterbody crossings) or
    adjacent to the existing right-of-way.” Id.
    4. Final Environmental Assessment. On August 23,
    2016, FERC published its Environmental Assessment for
    public comments—requesting that comments “focus on
    the potential environmental effects, reasonable
    alternatives, and measures to lessen or avoid
    environmental impacts.” JA 239. For reasons that are not
    clear from the record, the final Environmental Assessment
    omitted the draft’s analysis of the compression alternative.
    The final assessment did, nonetheless, recommend a
    10
    “finding of no significant impact” because the Orion
    Project’s “impacts on waterbodies and wetlands would be
    minor and temporary.” JA 340, 274, 278.
    5. Public Comments. Before the publication of the
    Environmental Assessment, “[n]one of the environmental
    comments received on the Orion Project identified specific
    alternatives to the proposed looping segments.” JA 335.
    After publication, groups including Riverkeeper
    commented on alternatives but never specifically
    addressed compression.
    The Corps received no public comments and received
    no requests for a public hearing.
    6. FERC Order Issuing a Certificate. On February 2,
    2017, FERC published its Order Issuing a Certificate,
    approving the Orion Project and issuing a “certificate of
    public convenience and necessity.” 15 U.S.C. § 717f(c).
    FERC explained that it “evaluated alternatives to the
    Orion Project to determine whether they would be
    reasonable and environmentally preferable to the proposed
    project,” and “affirm[ed] the conclusion in the
    [Environmental Assessment] that no reasonable
    alternative would result in significantly less environmental
    impacts and accomplish the project’s objective.” JA 635.
    The Order also noted that “[w]hile Delaware
    Riverkeeper presents general alternatives that would
    potentially result in less impact, Tennessee’s application
    11
    and its response to Delaware Riverkeeper’s comments
    provide further evidence that the Orion Project could not
    be satisfied by relying on other transportation systems or
    looping, compression, and route alternatives along
    Tennessee’s own system.” JA 635 (emphasis added).
    7. Corps Considers and Issues a Section 404 Permit.
    Concurrently with the FERC process, the Corps reviewed
    Tennessee Gas’s application for a Section 404 permit. The
    Corps issued its permit on the same date as FERC’s order,
    February 2, 2017. The Corps incorporated the
    Environmental Assessment into its findings—concluding
    that the water impacts would be “temporary in nature” and
    the project would have a “[n]egligible effect.” JA 432–34.
    The Corps further concluded that “there are no reasonable
    or practicable alternatives” for which there would be no
    “significant adverse environmental effects,” and that the
    Orion Project complies with the Guidelines. JA 445–46,
    438. Construction was authorized to begin on March 15,
    2017.
    8. Litigation. Riverkeeper filed this petition on March
    10, 2017. Tennessee Gas filed a motion to intervene, which
    the Court granted on March 17, 2017. On April 7, 2017,
    this Court denied Riverkeeper’s emergency motion for a
    stay. On April 26, 2017, this Court granted Riverkeeper’s
    motion to expedite the case.
    12
    II
    We have jurisdiction to review this petition under the
    Natural Gas Act. Where an interstate pipeline project is
    proposed for construction, see 15 U.S.C. § 717f, we have
    “original and exclusive jurisdiction over any civil action
    for the review of an order or action of a Federal agency
    (other than [FERC]) . . . acting pursuant to Federal law to
    issue . . . any permit, license, concurrence, or approval . . .
    required under Federal law,” 15 U.S.C. § 717r(d)(1).
    We review for arbitrary or capricious agency action. 
    5 U.S.C. § 706
    (2)(A). Under that standard, an agency must
    “examine the relevant data and articulate a satisfactory
    explanation for its action including a ‘rational connection
    between the facts found and the choice made.’” Motor
    Vehicle Mfrs. Ass’n of U.S. v. State Farm Mut. Auto. Ins.
    Co., 
    463 U.S. 29
    , 43 (1983) (quoting Burlington Truck
    Lines v. United States, 
    371 U.S. 156
    , 168 (1962)). “We will
    . . . ‘uphold a decision of less than ideal clarity if the
    agency’s path may reasonably be discerned.’” 
    Id.
     (quoting
    Bowman Transp., Inc. v. Arkansas-Best Freight Sys., Inc.,
    
    419 U.S. 281
    , 286 (1974)).
    III
    Before reaching the merits, we must first address
    whether Riverkeeper waived (or forfeited) its claims. We
    conclude that it did not. Although Riverkeeper failed to
    raise the compression alternative in its comments,
    13
    compression was otherwise brought to the agency’s
    attention. Furthermore, Riverkeeper’s failure to raise
    arguments before FERC does not waive its objections to a
    decision by the Corps.
    Challenges to agency action under NEPA are subject to
    a prudential waiver rule. Before bringing their NEPA
    challenges in court, parties must “structure their
    participation” in the administrative process “so that it . . .
    alerts the agency to the [parties’] position and contentions,
    in order to allow the agency to give the issue meaningful
    consideration.” Dep’t of Transp. v. Pub. Citizen, 
    541 U.S. 752
    , 764 (2004) (alteration in original) (internal quotation
    marks omitted) (quoting Vt. Yankee Nuclear Power Corp.
    v. Nat. Resources Def. Council, Inc., 
    435 U.S. 519
    , 553
    (1978)). Under that standard, a challenger who claims that
    an agency failed to consider an environmentally preferable
    alternative must generally raise that alternative in its
    comments. 
    Id.
     at 764–65.
    Courts have recognized two exceptions to the
    prudential waiver rule. “First, commenters need not point
    out an environmental assessment’s flaw if it is ‘obvious.’
    Second, a commenter does not waive an issue if it is
    otherwise brought to the agency’s attention.” Sierra Club,
    14
    Inc. v. Bostick, 
    787 F.3d 1043
    , 1048 (10th Cir. 2015)
    (citation omitted) (quoting Pub. Citizen, 
    541 U.S. at 765
    ).5
    In this case, Riverkeeper actively participated in the
    administrative process but never raised what has now
    become its central argument—that compression is a
    legally mandated alternative. According to the Corps and
    Tennessee Gas, Riverkeeper was required to raise that
    objection before FERC. We need not address whether the
    prudential waiver rule applies in this case where
    Riverkeeper brought challenges under the Clean Water Act
    only, not NEPA. And even if the rule did apply,
    Riverkeeper has not waived its claims for two reasons.
    First, the compression alternative was “otherwise
    brought to the agency’s attention.” Bostick, 787 F.3d at
    1048. Tennessee Gas addressed the compression
    alternative in its initial application to FERC and in its
    follow-on application to the Corps. And as described
    below, the Corps considered and rejected the compression
    alternative. It did so for substantially the same reasons set
    forth in Tennessee Gas’s application. The compression
    5
    The Ninth Circuit treats these two exceptions as one.
    See Barnes v. U.S. Dep’t of Transp., 
    655 F.3d 1124
    , 1132
    (9th Cir. 2011) (“This court has interpreted the ‘so
    obvious’ standard as requiring that the agency have
    independent knowledge of the issues that concern
    petitioners.”). But whether there is one exception or two,
    in either case, an exception applies here.
    15
    alternative is thus fair game for litigation and cannot come
    as a surprise to the Corps.
    The Corps objects that “the general idea” of
    compression may have been before it, but not
    Riverkeeper’s “particular alternative.” Resp. Br. 21. But
    the crux of Riverkeeper’s argument—that compression
    would have a smaller environmental impact—does not
    rely on any specific implementation of the compression
    alternative that was never presented to the agency. 6 See
    Beverly Hills Unified Sch. Dist. v. Fed. Transit Admin., No.
    12-cv-9861, 
    2016 WL 4650428
    , at *76 (C.D. Cal. Feb. 1,
    2016). Riverkeeper’s basic argument was considered (and
    responded to) in Tennessee Gas’s application, JA 408, and
    was further discussed in FERC’s draft Environmental
    Assessment, see JA 212 (characterizing compression’s
    environmental impact as “different,” “comparable,” and
    “possibly lower”). Because the Corps “had independent
    knowledge of the very issue that concerns [petitioner] in
    this case, . . . ‘there is no need for a commentator to point
    them out specifically in order to preserve its ability to
    challenge a proposed action.’” 'Ilio'ulaokalani Coal. v.
    6
    Riverkeeper does dispute Tennessee Gas’s position
    that two compressor stations would be needed to fulfill the
    project’s purpose. According to Riverkeeper, only one
    new station would be required. But as explained below,
    that dispute is not ultimately material to our conclusion.
    16
    Rumsfeld, 
    464 F.3d 1083
    , 1093 (9th Cir. 2006) (quoting
    Pub. Citizen, 
    541 U.S. at 765
    ).
    Second, the Corps’ process made it impracticable for
    Riverkeeper to lodge its objections with the Corps. The
    Corps opened its thirty-day comment period on June 10,
    2016, but FERC did not publicly release its Environmental
    Assessment until August 23, 2016—after the expiration of
    the Corps’ comment period. Any deficiencies with the
    Environmental Assessment for purposes of the Clean
    Water Act thus could not have been addressed to the Corps
    by comment.
    To be sure, Riverkeeper had every opportunity to object
    before FERC. It never did, including in its petition for
    rehearing filed February 14, 2017, most likely waiving its
    right to challenge FERC’s treatment of the compression
    alternative in court. See 15 U.S.C. § 717r(b). For that
    reason, Tennessee Gas characterizes this action against the
    Corps as a “disingenuous[]” collateral attack against
    FERC. Intervenor Br. 19.
    Certainly Riverkeeper could have raised its objections
    with FERC, and FERC might have communicated those
    objections to the Corps. But notwithstanding the agencies’
    cooperative relationship, each must fulfill independent
    legal responsibilities. In particular, FERC’s analysis under
    NEPA is substantively different than the Corps’ analysis
    under the Clean Water Act. See Utahns for Better Transp.
    v. U.S. Dep’t of Transp., 
    305 F.3d 1152
    , 1186 (10th Cir.
    17
    2002), as modified on reh’g, 
    319 F.3d 1207
     (10th Cir.
    2003) (noting that, unlike the Clean Water Act, “NEPA
    does not require the selection of the least damaging
    practicable alternative”). For that reason, an
    Environmental Assessment might be sufficient for
    purposes of NEPA but not for purposes of the Clean Water
    Act. The Guidelines contemplate that possibility and
    require the Corps to “supplement [deficient] NEPA
    documents with . . . additional information.” 
    40 C.F.R. § 230.10
    (a)(4). Thus, a party might have a viable objection
    before the Corps but not before FERC. At bottom, the
    Corps and Tennessee Gas ask us to ignore Riverkeeper’s
    arguments because those arguments were not raised before
    a different agency administering a different statute. We
    decline to do so.
    Even if the prudential waiver rule applies in this case,
    we conclude that Riverkeeper did not waive its arguments.
    The compression alternative was brought to the Corps’
    attention, and Riverkeeper was not required to present its
    Corps-specific objections to FERC. We proceed, then, to
    the merits.
    IV
    Riverkeeper argues that the Corps’ decision to issue a
    Section 404 permit was arbitrary and capricious for three
    reasons: (1) the Corps adopted an irrationally narrow
    definition of the project’s “basic purpose”; (2) the Corps
    failed to consider the compression alternative; and (3) the
    18
    Corps improperly rejected the compression alternative.
    We reject each argument in turn.
    A
    First, Riverkeeper argues that the Corps adopted an
    irrationally narrow definition of the project’s “basic
    purpose,” precluding alternatives like compression. We
    reject this argument for two reasons. First, Riverkeeper
    conflates the separate roles played by a project’s “basic
    purpose” and “overall purpose.” Second, any error arising
    from the project’s definition is harmless.
    Under the Guidelines, the Corps is required to conduct
    an alternatives analysis. But what counts as an alternative?
    To determine that, the agency looks to the range of projects
    that could achieve the same goal as the proposed project.
    “An alternative is practicable if it is available and capable
    of being done after taking into consideration cost, existing
    technology, and logistics in light of overall project
    purposes.” 
    40 C.F.R. § 230.10
    (a)(2) (emphasis added).
    Erroneously defining the “overall project purpose” can
    be consequential. If it is defined too narrowly, the Corps
    might arbitrarily constrict the universe of viable
    alternatives. See Jones v. Nat'l Marine Fisheries Serv., 
    741 F.3d 989
    , 1002 (9th Cir. 2013) (“[T]he Corps may not
    manipulate the project purpose so as to exclude alternative
    sites . . . .”); Sylvester v. U.S. Army Corps of Eng’rs, 
    882 F.2d 407
    , 409 (9th Cir. 1989) (“Obviously, an applicant
    19
    cannot define a project in order to preclude the existence
    of any alternative sites and thus make what is practicable
    appear impracticable.”).
    Separately, the Corps is required to determine whether
    a project is “water dependent.” 
    40 C.F.R. § 230.10
    (a)(3).
    For that, the Corps evaluates whether the project
    “require[s] access or proximity to or sit[s] within the
    special aquatic site in question to fulfill its basic purpose.”
    
    Id.
     (emphasis added). We will return to water dependency
    in a later section. For now, it is enough to understand that
    the basic purpose (for determining water dependency) is
    distinct from the overall purpose (for determining
    practicable alternatives).
    In this case, FERC and the Corps 7 adopted the
    following definitions:
    • Overall project purpose: “to increase natural gas
    transportation in order to respond to the needs of
    three contracted shippers.”
    7
    Under the regulatory scheme, FERC defines the
    project’s basic and overall purposes. Then, pursuant to the
    Memorandum of Understanding, “the Corps will give
    deference, to the maximum extent allowed by law, to the
    project purpose.” JA 39.
    20
    • Basic project purpose: “to construct natural gas
    pipeline loops.”
    JA 430–31. Riverkeeper argues that the Corps adopted too
    narrow a definition of the project’s basic purpose. By
    limiting the definition to “pipeline loops,” Riverkeeper
    argues, the Corps excluded alternatives like compression.
    In Riverkeeper’s view, the Corps could reject compression
    because it would not constitute an alternative method of
    achieving the project’s basic purpose, “construct[ing]
    natural gas pipeline loops.” JA 431.
    But as described above, the project’s basic purpose
    does not delimit the agency’s alternatives analysis. The
    overall purpose does. See All. For Legal Action v. U.S.
    Army Corps of Eng’rs, 
    314 F. Supp. 2d 534
    , 548
    (M.D.N.C. 2004) (“Once the Corps determines the water
    dependency of a project, it no longer considers the basic
    project purpose but analyzes practicable alternatives in
    light of overall project purposes.” (internal quotation
    marks omitted)). Here, the overall purpose was not
    defined in such a way as to exclude the compression
    alternative. Compression could very well be an alternative
    method of “increase[ing] natural gas transportation,” JA
    430, provided it also satisfied the other regulatory
    requirements. See Gouger v. U.S. Army Corps of Eng’rs,
    
    779 F. Supp. 2d 588
    , 606 (S.D. Tex. 2011) (collecting
    cases, and observing that “an ‘overly narrow’ project
    purpose is a rare occurrence”).
    21
    But even assuming, arguendo, that the agency
    erroneously defined the project’s basic purpose, such an
    error does not categorically compel us to reverse the
    agency’s permitting decision. “[T]he Administrative
    Procedure Act (APA) directs us to take account of ‘the rule
    of prejudicial error.’ In other words, we apply a ‘harmless
    error’ analysis to any administrative action we review[.]”
    Del. Riverkeeper, 833 F.3d at 377 (footnotes omitted). As
    described below, the Corps considered the compression
    alternative. Furthermore, the Corps did not reject the
    compression alternative on the ground that it could not
    achieve the project’s basic purpose.
    Both in principle and in practice, the project’s “basic
    purpose” did not arbitrarily constrain the Corps’
    alternatives analysis. We therefore reject Riverkeeper’s
    first argument.
    B
    Riverkeeper next argues that the Corps failed to
    consider the compression alternative. 8 We reject that
    argument. Despite being omitted from FERC’s
    Environmental Assessment, compression was evaluated in
    8
    Riverkeeper abandoned this argument. See Transcript
    of Oral Argument at 13:3–5 (“It did review it. Yes, no
    doubt that they did review the compression alternative.”).
    We will still briefly address it in the interest of
    thoroughness.
    22
    Tennessee Gas’s application and expressly referenced in
    the Corps’ findings.
    Tennessee Gas’s application to the Corps included an
    alternatives      analysis    that     explicitly discussed
    compression. See JA 69. The Corps’ alternatives analysis
    cross-references Tennessee Gas’s application and
    expressly identifies compression as one of the alternatives
    considered. See JA 438 (“[Tennessee Gas] examined
    several alternatives . . . including . . . Compression
    Alternatives . . . .”). That statement is sufficient to
    persuade us that the Corps in fact considered compression
    as part of its alternatives analysis.9
    Riverkeeper objects that FERC’s final Environmental
    Assessment never mentioned compression. Indeed, the
    final document stated that FERC “did not evaluate any
    aboveground facility site alternatives.” JA 335. According
    to Riverkeeper, FERC’s failure to address compression
    becomes the Corps’ failure as well. Even granting that
    FERC had abandoned its analysis of compression, the
    Corps did not solely review the contents of FERC’s
    Environmental Assessment. See JA 445 (“[T]his office has
    9
    Our conclusion is further supported by FERC’s draft
    Environmental Assessment, which specifically analyzed
    the compression alternative. See JA 210–12. But because
    the draft was not made publicly available and was not
    referenced in the Corps’ findings, we do not give it
    dispositive weight.
    23
    reviewed all the available information contained in the
    Environmental Assessment prepared by FERC dated
    August 2016, and supporting documents . . . .” (emphasis
    added)); id. (“Based on a review of all information
    contained in the application file and extensive
    coordination with the applicant [Tennessee Gas]
    . . . .”(emphasis added)); see also JA 438 (discussing
    Tennessee Gas’s alternatives analysis, and concluding that
    “the alternatives analysis carried out . . . was commiserate
    [sic] with the level of impact”).
    Accordingly, we conclude that the Corps did not
    arbitrarily or capriciously ignore the compression
    alternative.
    C
    We next consider whether the Corps rejected the
    compression alternative for rational reasons in accordance
    with the applicable law. We conclude that it did.
    According to Riverkeeper, the Corps did not comply
    with two regulations when it rejected the compression
    alternative. First, Riverkeeper argues that the Corps failed
    to make sufficient findings under 
    40 C.F.R. § 230.10
    (a).
    Second, Riverkeeper argues that the Corps was required to
    hold Tennessee Gas to a heightened standard under 
    40 C.F.R. § 230.10
    (a)(3) and failed to do so. We address each
    argument in turn.
    24
    1
    First, Riverkeeper argues that the Corps erroneously
    rejected the compression alternative by failing to make
    appropriate findings under 
    40 C.F.R. § 230.10
    (a). We
    reject that argument.
    Under that regulatory provision, “no discharge of
    dredged or fill material shall be permitted if there is a [1]
    practicable alternative to the proposed discharge [2] which
    would have less adverse impact on the aquatic ecosystem,
    [3] so long as the alternative does not have other
    significant adverse environmental consequences.” 
    40 C.F.R. § 230.10
    (a). Riverkeeper argues that the
    compression alternative satisfies all three conditions.
    We agree with Riverkeeper that compression meets the
    first two prongs, but the Corps properly concluded that
    compression would “have other significant adverse
    environmental consequences.” 
    Id.
    a. Practicability. First, the Corps may reject an
    alternative if it is not practicable. 
    Id.
     “An alternative is
    practicable if it is available and capable of being done after
    taking into consideration cost, existing technology, and
    logistics in light of overall project purposes.” 
    Id.
    § 230.10(a)(2).
    The Corps argues that, based on information in
    Tennessee Gas’s application and the draft Environmental
    25
    Assessment, compression would result in “higher Project
    operating and fuel costs,” JA 408, and would have lower
    “economic efficiency” than the Orion Project, JA 211. The
    Corps argues that “this information alone would support a
    finding that the compression alternative was not
    ‘practicable’ under the Guidelines.” Resp. Br. 32.
    First, the fact that an alternative might have some
    unquantified higher operating cost does not mean the
    alternative is not “available” or “capable of being done.”
    
    40 C.F.R. § 230.10
    (a)(2). More information would be
    required to reach that conclusion. Cf. Jones, 741 F.3d at
    1002 (finding an alternative impracticable because “no
    one would seek financing to build a refining facility if it
    were not possible to extract a sufficient quantity of
    minerals to make the project profitable”).
    Second, while the Corps’ alternatives analysis
    discussed the environmental implications of the Orion
    Project relative to the alternatives, it never once mentioned
    costs or practicability. See JA 438. We are unable to
    “supply a reasoned basis for the agency’s action that the
    agency itself has not given.” Motor Vehicle Mfrs., 
    463 U.S. at 43
     (quoting SEC v. Chenery Corp., 
    332 U.S. 194
    , 196
    (1947)). To be sure, the Corps’ “Conclusion” section
    asserts that “there are no reasonable or practicable
    alternatives.” JA 446. But the agency did not articulate any
    reasoning in support of that conclusion, let alone any
    reasoning applicable to compression. The absence of any
    reasoning is especially critical in light of FERC’s draft
    26
    Environmental Assessment, which concluded that
    building a new compressor station would be practicable.
    See JA 212 (“This alternative meets the purpose and need,
    [and] is technically feasible.”).
    Accordingly, we cannot uphold the Corps’ decision on
    practicability grounds.
    b. Aquatic impacts. Second, an alternative must “have
    less adverse impact on the aquatic ecosystem.” 
    40 C.F.R. § 230.10
    (a). The Corps wisely does not argue this issue.
    As the draft Environmental Assessment concludes, the
    compression alternative would “eliminate 30 waterbody
    crossings . . . and impacts on wetlands.” JA 212.
    c. Overall environmental impact. That brings us to the
    final ground that the Corps may rely upon to reject the
    compression alternative. Even though compression may
    be “a practicable alternative . . . which would have less
    adverse impact on aquatic ecosystems,” the Corps
    properly concluded that it would “have other significant
    adverse environmental consequences.” 
    40 C.F.R. § 230.10
    (a). Although the Corps’ analysis is not pellucid,
    the Corps determined as a practical matter that the
    permanent impacts of compression are sufficiently
    “significant.”
    i. The Corps deemed the environmental impact of
    compression too “significant” to endorse. In its
    alternatives analysis, Tennessee Gas stated that “adding a
    27
    new (greenfield) compressor station would require
    Tennessee [Gas] to obtain approximately 40-acres per
    site,” and that construction “would require permanent
    vegetation clearing from the area in order to install
    permanent access roads, fencing, buildings and other
    appurtenance equipment . . . resulting in increased impacts
    to the environment.” 
    Id.
     Tennessee Gas also observed that
    “a new (greenfield) compressor station would be an
    aboveground facility with light pollution and noise
    impacts and may also become a source of [greenhouse gas]
    emissions.” 
    Id.
     In contrast to those permanent
    environmental impacts, the land affected by the Orion
    Project “will be allowed to re-vegetate to minimize and
    mitigate possible environmental impacts.” 
    Id.
    In its alternatives analysis, the Corps favored the Orion
    Project for those same reasons:
    [Tennessee       Gas]     examined     several
    alternatives . . . including . . . Compression
    Alternatives . . . . The preferred alternative
    co-locates the new pipe within the existing
    right of way, thereby avoiding clearing of a
    new greenway. The majority of impacts are
    temporary, and will be restored to minimize
    the resultant impact. Permanent conversion
    in impacts are from one wetland type (PFO or
    PSS) to another wetland type (PEM), and do
    not result in wetlands being converted to
    uplands.
    28
    JA 438. The Corps articulated a clear preference for
    temporary environmental impacts, in direct contrast to the
    permanent impacts of compression cross-referenced in
    Tennessee Gas’s report. The Corps’ conclusion, therefore,
    amounts to judgment that permanent environmental
    impacts—including those from compression—are
    “significant” in this context.
    Riverkeeper objects that the Corps never explicitly
    found any impact “significant.” But the omission of that
    singular word is not fatal. Even if the agency’s decision is
    “of less than ideal clarity,” we will uphold it “if the
    agency’s path may reasonably be discerned.’” Motor
    Vehicle Mfrs., 
    463 U.S. at 43
     (quoting Bowman, 419 U.S.
    at 286). Here, the agency’s path can reasonably be
    discerned: the Corps rejected the compression alternative
    on the ground that its permanent impacts—including
    permanent de-vegetation of forty to eighty acres of
    greenfield and light, noise, and greenhouse gas
    emissions—would be significant under 
    40 C.F.R. § 230.10
    (a).
    ii. The Corps’ finding was not arbitrary or capricious.
    Riverkeeper further objects that, even if the Corps
    implicitly found the permanent environmental impact of
    compression “significant,” that finding was clearly
    erroneous. Applying our deferential standard of review,
    we reject that argument.
    29
    According to Riverkeeper, the Orion Project would
    result in “long-term impact[s] on forested areas (30 to 50
    years to reach preconstruction mature tree size and
    densities)” on over 47 acres of forested uplands. JA 282.
    Additionally, the project would result in “222.6 more acres
    of total disturbed land, over a hundred more acres of
    impacts to agricultural lands, nearly 6 more acres of
    permanently deforested wetlands, 15 more acres of
    impacts to water resources, impact on 65 more wetlands
    and 31 more streams, and will traverse 2,100 feet of steep
    slopes.” Reply Br. 15. By contrast, light, air, and sound
    pollution from compression were never quantified,
    according to Riverkeeper.
    The Corps concedes that the Orion Project will disturb
    more land. But it is well supported in the record, and
    Riverkeeper does not dispute, that the land will be restored
    and allowed to revegetate. See JA 664 (“[I]f Tennessee
    [Gas] complies with the construction and restoration
    methods described . . . the impacts on waterbodies and
    wetlands would be minor and temporary.”); JA 665 (“The
    required mitigation measures are adequately protective
    and will be enforced.”). That regrowth may occur over a
    long period of time, but the compression alternative’s
    impacts would continue indefinitely. And as for the Orion
    Project’s permanent effects on wetlands, those were not
    concerning to the Corps based on its expert judgment. See
    JA 438 (“Permanent conversion in impacts are from one
    wetland type (PFO or PSS) to another wetland type
    30
    (PEM), and do not result in wetlands being converted to
    uplands.”).
    When evaluating the significance of certain aquatic
    impacts, the Corps is instructed to put “special emphasis
    on the persistence and permanence of the effects.” 
    40 C.F.R. § 230.10
    (c); see also 
    id.
     § 230.1 (“The guiding
    principle should be that degradation or destruction of
    special sites may represent an irreversible loss of valuable
    aquatic resources.”). We conclude that it was not a clear
    error of judgment for the Corps to apply similar reasoning
    to other kinds of environmental considerations,
    particularly when the Orion Project would not result in any
    net loss of wetlands or other aquatic resources.
    Riverkeeper further objects that environmental impacts
    of compression cannot be “significant” under the
    Guidelines because FERC has found similar projects not
    significant under NEPA. See Minisink Residents for Envtl.
    Pres. & Safety v. F.E.R.C., 
    762 F.3d 97
    , 104 (D.C. Cir.
    2014). That analogy is unpersuasive because the
    requirements of NEPA are different and not at issue here.
    By Riverkeeper’s logic, the Corps could only reject an
    alternative as having “other significant adverse
    environmental consequences,” 
    40 C.F.R. § 230.10
    (a), if
    the alternative would also constitute a “major Federal
    action[] significantly affecting the quality of the human
    environment” under NEPA, 
    42 U.S.C. § 4332
    (C).
    Riverkeeper’s approach finds no support in any regulation
    31
    or case. It conflates two bodies of law with different text,
    authorship,10 and purpose.
    For example, finding significance under NEPA triggers
    a duty to prepare a full Environmental Impact Statement
    rather than a concise Environmental Assessment. See
    Lower Alloways Creek Twp. v. Pub. Serv. Elec. & Gas Co.,
    
    687 F.2d 732
    , 740 (3d Cir. 1982). If we were to adopt this
    definition of significance, the Guidelines would fail to
    address situations where an alternative’s impact would be
    significant enough to be substantially worse for the
    environment than the proposed project, but would not be
    10
    The Guidelines are promulgated by the
    Environmental Protection Agency, whereas NEPA’s
    implementing regulations are promulgated by the Council
    on Environmental Quality. For purposes of NEPA,
    “significantly” is defined by regulation. See 
    40 C.F.R. § 1508.27
    . Riverkeeper does not, and cannot, argue that
    the same definition is controlling here. To the contrary, the
    Corps acted consistently with the understanding of
    significance expounded elsewhere in the Guidelines. See,
    e.g., 
    40 C.F.R. § 230.3
    (o)(3)(v) (“For an effect to
    be significant, it must be more than speculative or
    insubstantial.”); 
    40 C.F.R. § 230.10
    (c) (“Findings
    of significant degradation . . . shall be based upon
    appropriate factual determinations, . . . with special
    emphasis on the persistence and permanence of the
    effects.”).
    32
    significant enough to constitute a “major Federal
    action[].” 
    42 U.S.C. § 4332
    (C). Nothing in § 230.10(a)
    requires the Corps to insist on such an alternative.
    Even under NEPA, determining significance is more art
    than science. “By adding the word ‘significantly,’ . . .
    Congress apparently was willing to depend primarily upon
    the agency’s good faith determination as to what conduct
    would be sufficiently serious from an ecological
    standpoint to require use of the full-scale procedure.” Pub.
    Citizen v. Nat'l Highway Traffic Safety Admin., 
    848 F.2d 256
    , 266 (D.C. Cir. 1988) (quoting Hanly v. Kleindienst,
    
    471 F.2d 823
    , 830 (2d Cir. 1972)). Here, the Corps acted
    consistently with that understanding: it made a “good faith
    determination” that the permanent environmental
    consequences of certain alternatives, including
    compression, “would be sufficiently serious from an
    ecological standpoint” to prefer the Orion Project. 
    Id.
    Accordingly, the Corps’ finding that the compression
    alternative had other significant adverse impacts on the
    environment, precluding its selection, was not arbitrary or
    capricious based on the record before us.
    2
    Riverkeeper’s final argument is that the Corps erred by
    failing to conduct a water-dependency analysis and by
    failing to hold Tennessee Gas to a heightened standard
    applicable to non-water-dependent projects. While the
    33
    Corps did not make an explicit water-dependency finding,
    its failure to do so was harmless because the Corps took
    an appropriately hard look at the project alternatives.
    As described above, a project is water dependent if it
    “require[s] access or proximity to or sit[s] within the
    special aquatic site in question to fulfill its basic purpose.”
    
    40 C.F.R. § 230.10
    (a)(3). “Examples of water dependent
    projects include, but are not limited to, dams, marinas,
    mooring facilities, and docks. The basic purpose of these
    projects is to provide access to the water.” Sierra Club v.
    Van Antwerp, 
    709 F. Supp. 2d 1254
    , 1261 (S.D. Fla. 2009)
    (quoting Army Corps of Engineers Standard Operating
    Procedures for the Regulatory Program (Oct. 15, 1999)),
    aff’d, 362 F. App’x 100 (11th Cir. 2010).
    If the project is not water dependent, “practicable
    alternatives that do not involve special aquatic sites are
    presumed to be available, unless clearly demonstrated
    otherwise.” 
    40 C.F.R. § 230.10
    (a)(3). The applicant can
    “clearly demonstrate[] otherwise,” 
    id.,
     by putting forward
    “detailed, clear and convincing” information showing that
    non-aquatic alternatives are unavailable, Utahns for Better
    Transp., 
    305 F.3d at 1186
    . “This does not require a specific
    level of detail to rebut the presumption, but only record
    evidence the agency took a hard look at the proposals and
    reached a meaningful conclusion based on the evidence.”
    Hillsdale Envtl. Loss Prevention, Inc. v. U.S. Army Corps
    of Eng’rs, 
    702 F.3d 1156
    , 1168 (10th Cir. 2012).
    34
    Here, Riverkeeper is correct that the Corps did not
    make any finding regarding water dependency. But that
    was harmless error. Assuming that the Orion Project is not
    water dependent, and assuming that Tennessee Gas was
    required to overcome a heightened burden, the Corps’
    determination was still sufficient. Based on Tennessee
    Gas’s environmental report, combined with the Corps’
    concern with permanent environmental impacts, we
    conclude that the Corps “took a hard look at the proposals
    and reached a meaningful conclusion based on the
    evidence.” Hillsdale, 702 F.3d at 1168.
    To be sure, the Corps did not conduct a detailed
    analysis of the compression alternative. But under the
    principle of commensurate review, it was not required to
    do so. “Although all requirements in § 230.10 must be
    met, the compliance evaluation procedures will vary to
    reflect the seriousness of the potential for adverse impacts
    on the aquatic ecosystems posed by specific dredged or fill
    material discharge activities.” 
    40 C.F.R. § 230.10
    ; see also
    
    id.
     § 230.6(a). The Corps explicitly endorsed Tennessee
    Gas’s analysis under that rubric: “Based upon the level of
    impact to aquatic resources, it was determined that the
    alternatives analysis carried out in order to avoid aquatic
    resource impacts was commiserate [sic] with the level of
    impact.” JA 438.
    Thus, we conclude that the Corps acted in accordance
    with the applicable regulations when it rejected the
    compression alternative.
    35
    V
    For the foregoing reasons, we will uphold the decision
    of the Corps and deny the petition for review.
    36