Delaware Riverkeeper Network v. Federal Energy Regulatory Commission ( 2017 )


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  •  United States Court of Appeals
    FOR THE DISTRICT OF COLUMBIA CIRCUIT
    Argued April 4, 2017                 Decided May 23, 2017
    No. 16-1092
    DELAWARE RIVERKEEPER NETWORK AND MAYA VAN
    ROSSUM, THE DELAWARE RIVERKEEPER,
    PETITIONERS
    v.
    FEDERAL ENERGY REGULATORY COMMISSION,
    RESPONDENT
    TRANSCONTINENTAL GAS PIPE LINE COMPANY, LLC,
    INTERVENOR
    On Petition for Review of Orders of the
    Federal Energy Regulatory Commission
    Aaron Stemplewicz argued the cause and filed the briefs
    for petitioners.
    Holly E. Cafer, Senior Attorney, Federal Energy
    Regulatory Commission, argued the cause for respondent.
    With her on the brief were Robert H. Solomon, Solicitor, and
    Lisa B. Luftig, Attorney. Karin L. Larson, Attorney, Federal
    Energy Regulatory Commission, entered an appearance.
    2
    John F. Stoviak argued the cause for intervenor. With him
    on the brief were Pamela S. Goodwin, Elizabeth U. Witmer,
    and Patrick F. Nugent.
    Before: GARLAND, Chief Judge, GRIFFITH, Circuit Judge,
    and EDWARDS, Senior Circuit Judge.
    EDWARDS, Senior Circuit Judge: This case involves three
    federal statutes: the Natural Gas Act (“NGA”), 15 U.S.C.
    § 717, et seq.; the Clean Water Act (“CWA”), formally titled
    the Federal Water Pollution Control Act Amendments of 1972,
    33 U.S.C. § 1251, et seq.; and the National Environmental
    Policy Act (“NEPA”), 42 U.S.C. § 4321, et seq. Although the
    Federal Energy Regulatory Commission (“FERC” or
    “Commission”) administers only the NGA, all three statutes
    apply to the disputed actions taken by the Commission in this
    case.
    On September 30, 2013, Transcontinental Gas Pipe Line
    Company, LLC (“Transco”) filed an application with FERC to
    construct and operate its proposed Leidy Southeast Project
    (“Leidy Project”). The project was designed to expand the
    capacity of Transco’s existing natural gas pipeline and add new
    facilities in Pennsylvania and New Jersey. Pursuant to the
    requirements of NEPA, FERC conducted an environmental
    review of the project and issued an environmental assessment
    (“EA”) on August 11, 2014. The EA found, with appropriate
    mitigating measures, “no significant impacts” associated with
    the Leidy Project. However, it required Transco to obtain “all
    applicable authorizations required under federal law” prior to
    FERC authorizing construction. Because it was understood that
    the Leidy Project might result in discharges into navigable
    waters, Transco was obligated by § 401 of the CWA to obtain
    a water quality certification from the state in which the
    discharge would originate before FERC could authorize any
    3
    activity that “may result” in such a discharge. See 33 U.S.C.
    § 1341(a)(1). The EA thus in turn required Transco to obtain
    this state certification before FERC would authorize any
    construction.
    On June 10, 2014, Transco applied for a § 401 certification
    from Pennsylvania’s Department of Environmental Protection.
    On December 18, 2014, before Pennsylvania had acted on
    Transco’s application, FERC issued a Certificate of Public
    Convenience and Necessity (“Certificate Order”) under the
    NGA conditionally approving the Leidy Project. The
    Certificate Order made it clear that FERC would not authorize
    any construction until Transco had obtained a § 401
    certification from Pennsylvania. Delaware Riverkeeper
    Network, a nonprofit organization, timely sought rehearing of
    the Certificate Order before the Commission. FERC denied the
    request for rehearing. Delaware Riverkeeper Network and
    Maya van Rossum, the current Delaware Riverkeeper (together
    “Riverkeeper”), then petitioned for review in this court.
    Transco intervened in support of the Commission.
    Before this court, Riverkeeper contends that the
    Commission violated the CWA because it granted Transco’s
    request to construct and operate the Leidy Project prior to the
    issuance of Pennsylvania’s § 401 water quality certification.
    Riverkeeper also claims that the Commission violated NEPA
    in failing to establish an accurate baseline from which to
    conduct its environmental review of the Leidy Project. In
    particular, Riverkeeper argues that FERC misidentified
    numerous specially protected wetlands, and miscalculated both
    the cover type categorization of those wetlands and the total
    acreage of those wetlands. We find no merit in these claims
    and, therefore, reject the petition for review.
    4
    I.   BACKGROUND
    A. Statutory Background
    Under the NGA, a natural gas pipeline company must
    obtain a Certificate of Public Convenience and Necessity from
    FERC prior to “undertak[ing] the construction or extension” of
    any natural gas facility for the transportation of natural gas in
    interstate commerce. 15 U.S.C. § 717f(c)(1)(A). FERC may
    place any reasonable conditions on the issuance of such a
    certificate “as the public convenience and necessity may
    require.” 
    Id. § 717f(e).
    This court has jurisdiction to review
    challenges to certificates granted under the NGA, but
    petitioning parties must first seek rehearing before the
    Commission and may not raise any argument before this court
    that was not raised on rehearing. See 15 U.S.C. § 717r(b).
    Letter orders issued by FERC are also subject to review in this
    court subject to the same rehearing requirement. See 18 C.F.R.
    § 385.1902.
    In addition to the requirements of the NGA, § 401 of the
    CWA requires “[a]ny applicant for a Federal license or permit
    to conduct any activity including . . . the construction or
    operation of facilities, which may result in any discharge into
    the navigable waters,” to “provide the licensing or permitting
    agency a certification from the State in which the discharge
    originates or will originate.” 33 U.S.C. § 1341(a)(1). The state
    must certify “that any such discharge will comply” with the
    CWA’s effluent limitations and other pollutant control
    requirements, including state-administered water quality
    standards. 
    Id. The state
    may certify that there are no applicable
    limitations or standards for the discharge activity, or it may
    deny certification or waive the certification requirement. 
    Id. But “[n]o
    license or permit shall be granted until the
    certification . . . has been obtained or has been waived.” 
    Id. Any 5
    limitation in a § 401 certification “shall become a condition” of
    the federal license or permit requiring such certification. 
    Id. § 1341(d).
    Section 401 is an important part of the CWA, in which
    “Congress sought to expand federal oversight of projects
    affecting water quality while also reinforcing the role of States
    as the prime bulwark in the effort to abate water pollution.”
    Alcoa Power Generating Inc. v. FERC, 
    643 F.3d 963
    , 971
    (D.C. Cir. 2011) (citation and internal quotation marks
    omitted). The state certification authority under § 401 is “‘[o]ne
    of the primary mechanisms’ through which [states] may
    exercise this role, as it provides them with ‘the power to block,
    for environmental reasons, local water projects that might
    otherwise win federal approval.’” 
    Id. (quoting Keating
    v.
    FERC, 
    927 F.2d 616
    , 622 (D.C. Cir. 1991)).
    The last statute at issue in this case is NEPA, which was
    enacted in part to “promote efforts which will prevent or
    eliminate damage to the environment and biosphere . . . [and]
    enrich the understanding of the ecological systems and natural
    resources important to the Nation.” 42 U.S.C. § 4321. As we
    recently explained:
    The Commission, in exercising its . . . authority,
    must comply with NEPA and its implementing
    regulations, which require that all federal agencies
    include an environmental impact statement (“EIS”)
    “in every recommendation or report on . . . major
    Federal actions significantly affecting the quality of
    the human environment.” 42 U.S.C. § 4332(2)(C); see
    also 40 C.F.R. § 1508.11. To determine whether an
    EIS is necessary, an agency first prepares an
    environmental assessment, 40 C.F.R. § 1508.9, which
    must include, among other information, a discussion
    6
    of “the environmental impacts of the proposed
    action,” 
    id. § 1508.9(b).
    “Indirect effects . . . are
    caused by the action and are later in time or farther
    removed in distance, but are still reasonably
    foreseeable.” 
    Id. § 1508.8(b).
    “Cumulative impact is
    the impact on the environment which results from the
    incremental impact of the action when added to other
    past, present, and reasonably foreseeable future
    actions regardless of what agency (Federal or non-
    Federal) or person undertakes such other actions.” 
    Id. § 1508.7;
    see also 
    id. § 1508.8.
    After preparing an
    environmental assessment, an agency may conclude
    that the proposed action would have no significant
    impact (often referred to as a “FONSI,” for “finding
    of no significant impact”) in lieu of issuing an EIS. 
    Id. §§ 1508.9(a)(1),
    1508.13.
    Sierra Club v. FERC, 
    827 F.3d 59
    , 63 (D.C. Cir. 2016). For
    either an EA or an EIS, the purposes of NEPA require the
    Commission to “consider and disclose” the environmental
    effects of the actions it certifies. Balt. Gas & Elec. Co. v. Nat.
    Res. Def. Council, Inc., 
    462 U.S. 87
    , 96 (1983). So long as the
    agency takes a hard look at the environmental consequences,
    NEPA “does not mandate particular results.” Robertson v.
    Methow Valley Citizens Council, 
    490 U.S. 332
    , 350 (1989).
    B. Factual and Procedural Background
    Transco maintains an interstate natural gas pipeline that
    runs from Texas to New York City, passing through
    Pennsylvania. In September 2013, Transco applied to FERC
    for a Certificate of Public Convenience and Necessity for the
    Leidy Project, which would add approximately thirty miles of
    looping to Transco’s existing pipeline in Luzerne and Monroe
    Counties, Pennsylvania and parts of New Jersey, to meet
    7
    increasing energy demands. On August 11, 2014, FERC issued
    a finding of no significant impact and published its review of
    the environmental consequences of the Leidy Project in a 217-
    page EA. Environmental Assessment, Joint Appendix (“JA”)
    168–331. Among a number of conditions, Environmental
    Condition No. 9 of the EA required Transco to obtain and file
    with the Secretary of the Commission “all applicable
    authorizations required under federal law (or evidence of
    waiver thereof)” prior to FERC authorizing construction. 
    Id. at 324.
    The EA identified § 401 state water quality certifications
    as required authorizations. The EA also discussed mitigation
    for the Leidy Project’s impact on Pennsylvania wetlands and
    concluded that the project’s proposed pipeline gas flow
    velocities were safe.
    Transco had timely applied for a § 401 certification from
    Pennsylvania’s Department of Environmental Protection on
    June 10, 2014. However, on December 18, 2014, FERC issued
    a Certificate Order to Transco, conditionally approving the
    Leidy Project, before Pennsylvania had acted on Transco’s
    § 401 request. The Certificate Order adopted the conditions of
    the EA, including Environmental Condition No. 9, which
    clearly stated that Transco was required to obtain all applicable
    federal authorizations, including a § 401 certification from
    Pennsylvania. FERC was thus clear that it would not authorize
    any construction before the necessary § 401 certifications had
    been obtained. On January 16, 2015, Riverkeeper sought
    rehearing of the Certificate Order before the Commission.
    During the early months of 2015, after the conditional
    Certificate Order had been issued, the Commission authorized
    Transco via letter orders to conduct certain “pre-construction”
    activities, including tree-felling. Riverkeeper moved the
    Commission to stay the tree-felling activity. FERC denied this
    request. Riverkeeper never sought rehearing of this action or of
    8
    any of FERC’s letter orders. Instead, on March 15, 2015,
    Riverkeeper filed a petition for an emergency stay with this
    court. The Petition was denied on March 19, 2015. Del.
    Riverkeeper Network v. FERC, No. 15-1052 (D.C. Cir. Mar.
    19, 2015), ECF No. 1543345. By the end of March 2015,
    Transco had begun felling trees, as authorized, along a right-
    of-way by the projected pipelines, including in Pennsylvania
    wetlands.
    On April 6, 2015, Pennsylvania’s Department of
    Environmental Protection issued a § 401 certification for the
    Leidy Project. Riverkeeper challenged the Pennsylvania
    certification by filing a petition for review in the Third Circuit,
    but the petition was denied. Del. Riverkeeper Network v. Sec’y
    Penn. Dep’t of Envtl. Prot., 
    833 F.3d 360
    , 385–88 (3d Cir.
    2016) (upholding Pennsylvania’s decision to issue the § 401
    certification).
    On March 3, 2016, FERC denied Riverkeeper’s request for
    rehearing. Riverkeeper timely petitioned this court for review
    of FERC’s EA, Certificate Order, and order denying rehearing.
    Transco intervened.
    II. ANALYSIS
    A. Standard of Review
    “[I]n evaluating the Commission’s authority to issue [a]
    challenged certificate of public convenience and necessity[,]
    [w]e . . . review[] the Commission’s interpretation of its
    authority to issue such a certificate by applying the two-step
    analytical framework of Chevron.” Myersville Citizens for a
    Rural Cmty., Inc. v. FERC, 
    783 F.3d 1301
    , 1315 (D.C. Cir.
    2015) (citing Chevron, U.S.A. Inc. v. Nat. Res. Def. Council,
    
    467 U.S. 837
    (1984)). Under the Chevron framework,
    9
    an agency’s power to regulate “is limited to the scope
    of the authority Congress has delegated to it.” Am.
    Library Ass’n v. FCC, 
    406 F.3d 689
    , 698 (D.C. Cir.
    2005). Pursuant to Chevron Step One, if the intent of
    Congress is clear, the reviewing court must give effect
    to that unambiguously expressed intent. If Congress
    has not directly addressed the precise question at issue,
    the reviewing court proceeds to Chevron Step Two.
    Under Step Two, “[i]f Congress has explicitly left a
    gap for the agency to fill, there is an express delegation
    of authority to the agency to elucidate a specific
    provision of the statute by regulation. Such legislative
    regulations are given controlling weight unless they are
    . . . manifestly contrary to the statute.” 
    Chevron, 467 U.S. at 843
    –44. Where a “legislative delegation to an
    agency on a particular question is implicit rather than
    explicit,” the reviewing court must uphold any
    “reasonable interpretation made by the administrator
    of [that] agency.” 
    Id. at 844.
    But deference to an
    agency’s interpretation of its enabling statute “is due
    only when the agency acts pursuant to delegated
    authority.” Am. Library 
    Ass’n, 406 F.3d at 699
    .
    EDWARDS, ELLIOTT, & LEVY, FEDERAL STANDARDS                     OF
    REVIEW 166–67 (2d ed. 2013).
    A court does not defer to an agency’s interpretation of a
    statute that it is not charged with administering. See Metro.
    Stevedore Co. v. Rambo, 
    521 U.S. 121
    , 138 n.9 (1997).
    Therefore, we do not accord Chevron deference to the
    Commission’s interpretation of the CWA because the
    Environmental Protection Agency, not FERC, administers the
    statute. See Alcoa 
    Power, 643 F.3d at 972
    . Our review of the
    requirements of the CWA is de novo. 
    Id. 10 Finally,
    we apply “a ‘rule of reason’ to an agency’s NEPA
    analysis and ha[ve] repeatedly refused to ‘flyspeck’ the
    agency’s findings in search of ‘any deficiency no matter how
    minor.’” 
    Myersville, 783 F.3d at 1322
    –23 (citations omitted).
    Because “NEPA’s requirements are ‘essentially procedural,’”
    so “long as the agency’s decision is ‘fully informed’ and ‘well-
    considered,’ it is entitled to judicial deference.” Nat. Res. Def.
    Council v. Hodel, 
    865 F.2d 288
    , 294 (D.C. Cir. 1988) (citations
    omitted). Especially “[w]hen considering FERC’s evaluation
    of ‘scientific data within its technical expertise,’ we afford
    FERC ‘an extreme degree of deference.’” 
    Myersville, 783 F.3d at 1308
    (citation omitted).
    B. Jurisdiction
    FERC argues that Riverkeeper’s Clean Water Act claim
    “may no longer present an ongoing case or controversy” as “[i]t
    is not clear what relief would be available to remedy
    Riverkeeper’s sequencing claims—if they prevailed—where
    the [state] water quality certifications have been issued and
    affirmed on appeal [by the Third Circuit].” Br. for FERC at 22
    n.3. In other words, according to FERC, even if the agency
    issued the conditional Certificate Order prematurely, no
    remedy is needed for the sequencing error because the state
    water quality certifications have been issued and found lawful.
    FERC’s argument is misguided.
    First, the principal issue before the Third Circuit was
    whether Pennsylvania “was required to engage in an
    environmental review prior to issuing a Water Quality
    Certification.” Del. 
    Riverkeeper, 833 F.3d at 385
    . Here, in
    contrast, the question raised by Riverkeeper is whether the
    Commission (not Pennsylvania) violated the sequencing
    requirement of the CWA by issuing its Certificate Order before
    Pennsylvania issued its § 401 certification. These are entirely
    11
    distinct issues and the former does not subsume the latter.
    FERC does not argue otherwise.
    Furthermore, Riverkeeper’s claim is not moot because
    once the CWA’s sequence has been flouted, the only fix is to
    start the process over. Riverkeeper asks this court to “rescind[]
    the Commission’s Orders, or remand[] the decision to ensure
    that the Orders comply with the [Clean Water Act] and NEPA.”
    Br. for Pet’rs at 15. We could provide Riverkeeper the remedy
    it seeks by rescinding the conditional Certificate Order. That
    would halt the project and force FERC to follow the proper
    sequence of action. See Gunpowder Riverkeeper v. FERC, 
    807 F.3d 267
    , 272 (D.C. Cir. 2015) (rejecting similar mootness
    argument because granting relief on the NEPA claim would
    undo the conditional certificate, which could start the CWA
    sequence over).
    Perhaps FERC means to suggest that no effectual relief can
    be granted because vacating the Certificate Order and
    remanding the matter to the agency would almost certainly
    have no real world consequences. In other words, in FERC’s
    view, even if the court were to remand the case, the agency
    could immediately re-issue the conditional Certificate Order
    because the state water quality certifications have been issued.
    Such a response by FERC is not unlikely, but it is surely not
    guaranteed. In any event, “[c]ourts often adjudicate disputes
    where the practical impact of any decision is not assured.”
    Chafin v. Chafin, 
    568 U.S. 165
    , 
    133 S. Ct. 1017
    , 1025 (2013).
    Therefore, we could grant Riverkeeper vacatur of FERC’s
    conditional Certificate Order even if its victory might be short
    lived. “Such relief would of course not be ‘fully satisfactory,’
    but with respect to the case as whole, ‘even the availability of
    a partial remedy is sufficient to prevent [a] case from being
    moot.’” 
    Id. at 1026
    (quoting Calderon v. Moore, 
    518 U.S. 149
    ,
    150 (1996) (per curiam)).
    12
    In sum, we agree with Riverkeeper that we have
    jurisdiction to consider its challenge to the Certificate Order on
    the ground that FERC violated the sequencing requirement of
    the CWA by issuing its Certificate Order before Pennsylvania
    issued its § 401 certification. We therefore proceed to the
    merits of Riverkeeper’s claims under both the CWA and
    NEPA.
    C. Riverkeeper’s Challenges Under the CWA
    Riverkeeper argues that the Commission violated § 401 of
    the CWA by “issu[ing] its approval of the [Leidy] Project prior
    to Pennsylvania’s issuance of its Clean Water Act Section 401
    water quality certificat[ion].” Br. for Pet’rs at 19. We disagree.
    We hold that the sequencing requirement of § 401 was not
    triggered because the Commission’s conditional approval of
    the Leidy Project construction did not authorize any activity
    which might result in a discharge in navigable waters.
    We decline to review Riverkeeper’s alternative CWA
    challenge to the letter orders approving pre-construction tree-
    felling. The NGA requires that, prior to challenging an order
    before this Court on review, a party first must file a petition for
    rehearing with the Commission and then specify the challenged
    orders in a petition for judicial review. 15 U.S.C. §§ 717r(a),
    (b). Because Riverkeeper failed to seek rehearing of any of the
    disputed letter orders authorizing pre-construction activities,
    those individual decisions are not properly before this court.
    13
    1. The Sequencing of the Certificate Order and the
    § 401 Certification
    Section 401 of the CWA requires that “[a]ny applicant for
    a Federal license or permit to conduct any activity . . . which
    may result in any discharge into the navigable waters” must
    first obtain a water quality certification from the state in which
    the discharge will originate, and that “[n]o license or permit
    shall be granted until the certification required by this section
    has been obtained or has been waived.” 33 U.S.C. § 1341(a)(1).
    Transco argues preliminarily that the Commission’s
    Certificate Order is not a “license or permit” subject to the
    CWA because it is a “certificate[] of public convenience and
    necessity.” Br. for Transco at 16; see 
    id. at 15–19.
    We reject
    this argument out of hand. The Commission agrees with
    Riverkeeper that its Certificate Order was a “license or permit”
    potentially subject to the requirements of § 401. Furthermore,
    Transco’s assertion comes too late: before the Commission,
    Transco never claimed that § 401 was inapplicable and the
    company applied to Pennsylvania for the certification without
    protest. Finally, it is clear that Congress intended § 401 to apply
    broadly to federal approval of potential pollution activity.
    The Supreme Court has noted that:
    State certifications under § 401 are essential in the
    scheme to preserve state authority to address the broad
    range of pollution, as Senator Muskie explained on the
    floor when what is now § 401 was first proposed:
    “No polluter will be able to hide behind a Federal
    license or permit as an excuse for a violation of
    water quality standard[s]. No polluter will be able
    to make major investments in facilities under a
    14
    Federal license or permit without providing
    assurance that the facility will comply with water
    quality standards. No State water pollution
    control agency will be confronted with a fait
    accompli by an industry that has built a plant
    without consideration of water quality
    requirements.” 116 Cong. Rec. 8984 (1970).
    These are the very reasons that Congress provided the
    States with power to enforce “any other appropriate
    requirement of State law,” 33 U.S.C. § 1341(d), by
    imposing conditions on federal licenses for activities
    that may result in a discharge, 
    ibid. S.D. Warren Co.
    v. Me. Bd. of Envtl. Prot., 
    547 U.S. 370
    , 386
    (2006).
    The CWA in its entirety “provides for a system that
    respects the States’ concerns” in application to all federal
    agencies. 
    Id. And the
    act of “licensing” or “permitting” clearly
    extends to “certifying,” which is merely a different name for
    the stamp of federal approval Congress intended to capture.
    Transco’s reliance on the doctrine of expressio unius, that
    Congress’s selection of “license or permit” excludes a
    “certificate,” is misplaced because that doctrine applies “only
    when ‘circumstances support[] a sensible inference that the
    term left out must have been meant to be excluded.’” NLRB v.
    SW Gen., Inc., 
    137 S. Ct. 929
    , 933 (2017) (citation omitted).
    Here, the broad sweep of the statute raises no such inference.
    The principal issue here is not whether FERC’s disputed
    Certificate Order is a “license or permit” covered by the CWA,
    but whether it approved “activity . . . which may result in any
    discharge” and thus triggered the requirements of the CWA. 33
    U.S.C. § 1341(a)(1). We have previously stated that the
    15
    “logically antecedent” question under § 401 is whether the
    disputed federal permit or license “is subject to the provisions
    of Section 401(a)(1)” in the first place. North Carolina v.
    FERC, 
    112 F.3d 1175
    , 1186 (D.C. Cir. 1997). If the activity
    that FERC approved would not result in a discharge, then the
    sequencing requirement of § 401 was not “trigger[ed].” See 
    id. at 1188.
    Here, the record indicates that the Certificate Order did not
    authorize any activity that could result in a discharge. Instead,
    the conditional Certificate Order was merely a first step for
    Transco to take in the complex procedure to actually obtaining
    construction approval. Br. for FERC at 25–28. And, as
    explained above, FERC required Transco to obtain the
    appropriate state agency permits, including a § 401
    certification from Pennsylvania, prior to FERC granting
    Transco permission to proceed with activity that could result in
    a discharge.
    Judge Rogers’ concurring statement in Gunpowder
    Riverkeeper, which we adopt, disposes of Riverkeeper’s claim
    in this case:
    The plain text of the Clean Water Act does not appear
    to prohibit the kind of conditional certificate the
    Commission issued here. On its face, section
    401(a)(1) does not prohibit all “license[s] or
    permit[s]” issued without state certification, only
    those that allow the licensee or permittee “to conduct
    any activity . . . which may result in any discharge into
    the navigable waters.” 33 U.S.C. § 1341(a)(1).
    Petitioner has pointed to no activities authorized by
    the conditional certificate itself that may result in such
    discharge prior to the state approval and the
    Commission’s issuance of a Notice to Proceed.
    
    16 807 F.3d at 279
    (Rogers, J., dissenting in part and concurring
    in the judgment) (second emphasis added); see also 
    Myersville, 783 F.3d at 1320
    –21 (upholding FERC’s conditional approval
    of a natural gas facility construction project where FERC
    conditioned its approval on the applicant securing a required
    federal Clean Air Act air quality permit from the state); Del.
    Dep’t. of Nat. Res. & Envtl. Control v. FERC, 
    558 F.3d 575
    ,
    578–79 (D.C. Cir. 2009) (holding Delaware suffered no
    concrete injury from FERC’s conditional approval of a natural
    gas terminal construction despite statutes requiring states’ prior
    approval because FERC conditioned its approval of
    construction on the states’ prior approval).
    Because the Certificate Order expressly conditioned
    FERC’s approval of potential discharge activity on Transco
    first obtaining the requisite § 401 certification, and was not
    itself authorization of any potential discharge activity, the
    issuance of the Certificate Order before Pennsylvania’s
    issuance of its § 401 certificate did not violate § 401 of the
    CWA.
    2.   The Letter Orders
    Riverkeeper alternatively contends that the Commission’s
    letter orders authorizing pre-construction tree-felling
    impermissibly approved activity that might have resulted in a
    proscribed discharge before Pennsylvania could issue its water
    quality certification. In response, the Commission contends
    that its letter orders did not trigger the requirements of § 401
    because the U.S. Army Corps of Engineers determined that
    Transco’s “proposed tree cutting activities would not result in
    a discharge,” JA 638, and FERC relied on the Corps’
    determination, JA 644–45. We need not decide this issue,
    however, because Riverkeeper did not independently challenge
    the letter orders. Neither FERC nor Riverkeeper dispute that
    17
    the letter orders reflected final agency action and were
    separately appealable after rehearing before the Commission.
    See 18 C.F.R. § 385.1902(a)–(b). But as it conceded at oral
    argument and in its briefing, Reply Br. for Pet’rs at 3–5,
    Riverkeeper did not request rehearing of the letter orders, so
    the letters are not properly before us for review. See 15 U.S.C.
    § 717r(a)–(b); see also Darby v. Cisneros, 
    509 U.S. 137
    , 145
    (1993) (recognizing the statutory rehearing requirement of
    § 717r as mandatory).
    In sum, we need not decide whether the letter orders
    impermissibly approved activity that might have resulted in a
    discharge before Pennsylvania issued its § 401 certification.
    D. The Commission’s Wetlands Analysis
    Riverkeeper contends that FERC violated NEPA by
    misclassifying wetlands in two ways: (1) under Pennsylvania’s
    own state classification system; and (2) under the “Cowardin”
    classification system. We reject both challenges. FERC did not
    purport to rely on Pennsylvania’s classification system and
    Riverkeeper does not show how any misclassification under the
    Cowardin system was prejudicial error.
    Nowhere in the EA does FERC even discuss, much less
    rely on, the application of Pennsylvania’s system. In Appendix
    I, the EA includes a secondary reference to wetlands as either
    “exceptional” or “other,” which is pursuant to the Pennsylvania
    Administrative Code. 25 Penn. Admin. Code § 105.17. See JA
    330–31. But the wetlands discussion in the EA itself does not
    use the terms “exceptional” or “other,” and does not refer to the
    Pennsylvania system at all.
    As Riverkeeper concedes, FERC was not bound to use
    Pennsylvania’s classification system. And the EA clearly
    18
    explains that the “field delineations of wetlands” in
    Pennsylvania were performed according to the U.S. Army
    Corps of Engineers’ “Wetlands Delineation Manual (COE,
    1987),” JA 202, and that delineated wetlands “were classified
    as described in Cowardin, et al., (1979),” JA 203. The EA thus
    classifies the wetlands as either Palustrine Forested, Palustrine
    Scrub-Shrub, or Palustrine Emergent wetlands. These three
    Palustrine wetland types are consistent with the Cowardin
    classification system referenced in the Corps’ delineation
    manual. See U.S. ARMY CORPS OF ENG’RS, WETLANDS
    DELINEATION MANUAL 3 (1987); LEWIS M. COWARDIN, ET AL.,
    CLASSIFICATION OF WETLANDS AND DEEPWATER HABITATS OF
    THE UNITED STATES 10–13 (1979).
    On rehearing, FERC again rejected Riverkeeper’s
    contention that the agency had used Pennsylvania’s system:
    “As indicated in the EA and the December 18 [Certificate]
    Order, Transco’s wetlands delineations were conducted using
    the Corps’ Wetlands Delineation Manual.” JA 716. Moreover,
    FERC made it clear that each state was to oversee its own
    delineation, clearly implying this was to be done for purposes
    of classification: “It is at the discretion of the Corps [and] the
    Pennsylvania Department of Environmental Protection . . . to
    determine whether Transco’s wetland delineations comply
    with each agency’s permit application process, prior to issuing
    the appropriate water quality permit.” JA 514; see also JA 203
    (using “delineate[]” in reference to identifying cover types).
    There is no evidence the secondary wetlands identifications in
    Appendix I as “exceptional” or “other,” even if erroneous, had
    any effect on FERC’s consideration of the environmental
    impact of the Leidy Project. Accordingly, there is no NEPA
    violation here.
    Riverkeeper’s second wetlands argument attacks the
    Cowardin classification system that the Commission actually
    19
    used. Riverkeeper contends that FERC “failed to accurately
    account for the expected ground disturbance impacts that will
    result from the [Leidy] Project’s construction and operational
    activity,” Br. for Pet’rs at 44, because it misidentified the cover
    types of fourteen wetlands – totaling approximately 3.8 acres
    that would be impacted by operation or construction – pursuant
    to the Cowardin system, see 
    id. at 44–49.
    For example,
    Riverkeeper argues that aerial photographs show that a wetland
    classified as Palustrine Emergent (non-forested) was “clearly”
    forested and therefore should have been classified as Palustrine
    Forested. 
    Id. at 46.
    However, Riverkeeper does not explain
    how this inexorably leads to the conclusion that FERC failed
    to accurately account for the Leidy Project’s impact on the
    environment. Indeed, the ultimate implication Riverkeeper
    raises for this alleged erroneous classification is an “alteration
    of wetland value due to vegetation clearing.” 
    Id. at 45
    (quoting
    JA 205). But the EA identifies only one difference in
    vegetation clearing: the time it takes for the three different
    types of wetlands to re-vegetate. See JA 205. Riverkeeper does
    not raise any unaccounted-for consequences of this. In other
    words, even assuming FERC misclassified a small area of
    Pennsylvania wetlands, this merely means the Leidy Project
    will result in a longer re-vegetation process for some wetlands,
    and a shorter re-vegetation process for others. Riverkeeper fails
    to explain how this caused FERC’s mitigation plan to be
    significantly deficient.
    What we see from the record in this case is that FERC
    responsibly addressed Riverkeeper’s misclassification
    argument in its Certificate Order. The Commission stated that
    it relied on its classification only to “disclose and evaluate
    potential impacts on wetlands and to serve as a starting point
    for the development of protective mitigation.” JA 514. FERC
    thus disclosed its methodology and purpose as a starting point
    for mitigation, which would subsequently involve the Corps
    20
    and state agencies to further oversee mitigation. See id.; JA
    716–17 (order denying rehearing). It seems clear here that
    FERC took the requisite “hard look” at the impact of the Leidy
    Project on the environment. 
    Hodel, 865 F.2d at 294
    (quoting
    Izaak Walton League of America v. Marsh, 
    655 F.2d 346
    , 371
    (D.C. Cir. 1981)). Even if FERC technically erred in some of
    its classifications, Riverkeeper has not shown any prejudice by
    virtue of the agency “fail[ing] to comply precisely with NEPA
    procedures.” Nevada v. Dep’t of Energy, 
    457 F.3d 78
    , 90 (D.C.
    Cir. 2006); see also 
    Hodel, 865 F.2d at 295
    –97 (refusing to
    remand despite an agency error because it had “serve[d]
    NEPA’s informational function”).
    E. The Commission’s Gas Flow Velocity Analysis
    In its final challenge, Riverkeeper contends that FERC
    “repeatedly failed to disclose information addressing both the
    safety and independent viability” of the Leidy Project’s
    projected pipeline gas flow velocities. Br. for Pet’rs at 57. This
    argument rests on Riverkeeper’s claims that FERC failed to
    consider and disclose (1) key information about Transco’s
    projected gas flow velocities, (2) the project’s interdependence
    on past or future pipeline projects, and (3) the safety risks of its
    gas flow velocities. 
    Id. at 50–60.
    Riverkeeper also contends
    that FERC treated the Leidy Project differently than a similarly
    situated project. We find no merit in these claims.
    First, the record belies Riverkeeper’s claim that FERC
    withheld critical information regarding the projected gas flow
    velocities. Riverkeeper asserts that it never received answers to
    nine questions it asked, regarding, inter alia, data about the
    pipe diameter, grade, wall thickness, and gas flow rates and
    pressures. 
    Id. at 54–55.
    The record shows, however, that FERC
    and Transco responded to Riverkeeper’s queries and made it
    clear that the flow diagrams contained in Exhibits G and G-II
    21
    answered the questions that had been raised. JA 159. On
    appeal, Riverkeeper summarily asserts that the cited exhibits
    were non-responsive to its questions, but it does not explain
    how so.
    In fact, the record before us shows that Riverkeeper was
    invited to view Transco’s hydraulic flow modeling software,
    used to project gas flow velocity, via video conference or in
    person (due to the software’s proprietary nature). Riverkeeper
    concedes that this offer was made but asserts it “made the
    decision” to “not waste . . . limited time and resources to fly
    their expert from Washington to Texas” to view the software.
    Reply Br. for Pet’rs at 24–25. This is hardly a compelling
    response, especially since Riverkeeper could have viewed the
    modeling software via video conferencing.
    In sum, on the record before us, we have no basis upon
    which to credit Riverkeeper’s vague and unsubstantiated
    assertions that FERC withheld key data from the public.
    Indeed, the record reflects that FERC made every effort to
    comply with requests for information and no information was
    withheld from Riverkeeper.
    Second, Riverkeeper contends that the EA’s data on the
    projected gas flow velocity was insufficient and, therefore, it
    could not review the dependence of the Leidy Project on future
    pipeline expansions. Riverkeeper says the information is
    important because FERC’s regulations require the agency to
    review connected, cumulative, or similar actions. See 40 C.F.R.
    § 1508.25(a); Del. Riverkeeper Network v. FERC, 
    753 F.3d 1304
    , 1309 (D.C. Cir. 2014). In support of this claim,
    Riverkeeper points to this court’s decision in Delaware
    Riverkeeper Network. That case is plainly distinguishable,
    however. There, the court determined that FERC had
    impermissibly segmented NEPA review by approving one of
    22
    four “indisputably related and significantly ‘connected’”
    pipeline upgrade projects without looking at the projects’
    cumulative impact. 
    Id. at 1313–14.
    Here, in contrast, FERC
    evaluated the cumulative impact of recent related projects, see
    JA 320, and found that “[t]he location of any future expansion
    facilities is entirely speculative.” JA 499. Riverkeeper offers no
    evidence to the contrary.
    Third, Riverkeeper alleges that it presented expert evidence
    to FERC that Transco’s proposed gas flow velocities were
    potentially unsafe, and these concerns were left “wholly
    unanswered and unrebutted.” Br. for Pet’rs at 57. The record
    indicates otherwise. The EA concluded that Transco’s
    proposed gas flow velocities, not to exceed 60-61 feet per
    second, were safe based on an American Petroleum Institute
    report that gave a conservative guideline for maximum flow
    velocity as 100 feet per second for pipelines exposed to liquid
    droplet erosion. The Commission concluded that Transco’s 60-
    61 feet per second maximum flow velocity was safe, especially
    since Transco’s pipelines would not be subject to liquid
    droplets. JA 498. In both instances, FERC highlighted the fact
    that Riverkeeper did not “cite any industry or government
    standard, regulation, or study to support its position” when
    expressing its concern that gas flow velocities beyond 50 feet
    per second would be unsafe. JA 315; see JA 496. We therefore
    reject Riverkeeper’s claims, which are based on sheer
    speculation, that FERC erred in its determinations regarding
    the safety of the Leidy Project’s gas flow velocities.
    Finally, we reject Riverkeeper’s contention that FERC
    treated similarly situated parties differently and, therefore, the
    agency’s determinations on gas flow velocity are arbitrary and
    capricious. Br. for Pet’rs at 57–60. In 2011, FERC determined
    that a pipeline project, the Northeast Upgrade Project, was not
    hydraulically feasible because its gas flow velocity would
    23
    exceed 40 feet per second. Riverkeeper thus asserts that
    FERC’s approval of the Leidy Project’s gas flow velocity of 60
    feet per second is unjustified. The two projects are quite
    different, however. The Northeast Upgrade Project proposed
    adding compression to an existing 24-inch diameter pipeline,
    without adding additional looping. See Br. for FERC at 44. In
    contrast, the Leidy Project proposed to add looping of 42-inch
    diameter pipeline, nearly double that of the Northeast Upgrade
    Project. Riverkeeper is conspicuously silent as to these salient
    differences.
    The Commission’s NEPA review of the Leidy Project’s
    proposed gas flow velocities appears to be fully informed and
    well-considered. Riverkeeper presents no countervailing
    evidence. As such, the Commission’s judgment is “entitled to
    judicial deference.” 
    Hodel, 865 F.2d at 294
    .
    III. CONCLUSION
    For the foregoing reasons, we deny the petition for review.
    So ordered.