Ohio Valley Environmental Coalition v. US Army Corps of Engineers , 716 F.3d 119 ( 2013 )


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  •                         PUBLISHED
    UNITED STATES COURT OF APPEALS
    FOR THE FOURTH CIRCUIT
    OHIO VALLEY ENVIRONMENTAL               
    COALITION, INC.; WEST VIRGINIA
    HIGHLANDS CONSERVANCY, INC.;
    SIERRA CLUB; COAL RIVER
    MOUNTAIN WATCH, INC.,
    Plaintiffs-Appellants,
    v.
    UNITED STATES ARMY CORPS OF
    ENGINEERS; ROBERT L. VAN
    ANTWERP, Commander and Chief
    of Engineers, U.S. Army Corps of
       No. 12-1999
    Engineers; ROBERT D. PETERSON,
    Colonel, District Engineer, U.S.
    Army Corps of Engineers,
    Huntington District,
    Defendants-Appellees,
    and
    HIGHLAND MINING COMPANY,
    Intervenor/Defendant-Appellee.
    
    Appeal from the United States District Court
    for the Southern District of West Virginia, at Huntington.
    Robert C. Chambers, District Judge.
    (3:11-cv-00149)
    Argued: March 19, 2013
    Decided: May 15, 2013
    2      OHIO VALLEY ENVIRONMENTAL v. U. S. ARMY CORPS
    Before TRAXLER, Chief Judge, and WILKINSON and
    NIEMEYER, Circuit Judges.
    Affirmed by published opinion. Judge Niemeyer wrote the
    opinion, in which Chief Judge Traxler and Judge Wilkinson
    joined. Judge Wilkinson wrote a separate concurring opinion.
    COUNSEL
    ARGUED: Joseph Mark Lovett, APPALACHIAN MOUN-
    TAIN ADVOCATES, Lewisburg, West Virginia, for Appel-
    lants. Michael Thomas Gray, UNITED STATES
    DEPARTMENT OF JUSTICE, Jacksonville, Florida; Robert
    G. McLusky, JACKSON KELLY, PLLC, Charleston, West
    Virginia, for Appellees. ON BRIEF: James M. Hecker, PUB-
    LIC JUSTICE, Washington, D.C., for Appellants. Michael R.
    Shebelskie, HUNTON & WILLIAMS, LLP, Richmond, Vir-
    ginia; James R. Snyder, M. Shane Harvey, JACKSON
    KELLY, PLLC, Charleston, West Virginia, for Appellee
    Highland Mining Company. Ignacia S. Moreno, Assistant
    Attorney General, UNITED STATES DEPARTMENT OF
    JUSTICE, Jacksonville, Florida, for Federal Appellees.
    OPINION
    NIEMEYER, Circuit Judge:
    In connection with a proposed surface coal mine adjacent
    to Reylas Fork (a stream) in Logan County, West Virginia,
    the West Virginia Department of Environmental Protection
    ("WVDEP") issued Highland Mining Company a permit
    under the Surface Mining Control and Reclamation Act
    ("SMCRA") to do the mining, finding that the proposed mine
    OHIO VALLEY ENVIRONMENTAL v. U. S. ARMY CORPS           3
    would not cause material damage to the hydrologic regime.
    The WVDEP also issued a water quality certification under
    § 401 of the Clean Water Act ("CWA"), concluding that the
    proposed mine would not cause or contribute to violations of
    the State’s EPA-approved water quality standards, as well as
    a National Pollutant Discharge Elimination System
    ("NPDES") permit under CWA § 402, finding that the pro-
    posed sediment pond for the mine would not have significant
    adverse effects. Finally, the U.S. Army Corps of Engineers
    (the "Corps") issued a fill permit under CWA § 404, authoriz-
    ing Highland Mining to place rock overburden into the adja-
    cent valley of Reylas Fork as part of the mining process. The
    Corps issued the permit without an environmental impact
    statement, finding that the fill would not have a substantial
    cumulative impact on the water quality in the relevant water-
    shed.
    Four environmental groups (collectively, the "Environmen-
    tal Coalition") commenced this action to challenge the fill
    permit issued under CWA § 404. The Environmental Coali-
    tion contends that the Corps, in conducting its analysis for the
    § 404 permit, "materially misapprehended" the baseline con-
    ditions in the relevant watershed, thus corrupting its analysis
    of the cumulative impact that the mine would have on the
    streams in the watershed. It also contends that the Corps acted
    arbitrarily and capriciously in determining that the valley fill
    would not have a significant cumulative impact on the water
    quality in the relevant watershed.
    The district court evaluated the data considered by the
    Corps, the Corps’ analysis, and the Corps’ conclusions and
    found that the Corps did not misapprehend the baseline condi-
    tions in the relevant watershed. Ohio Valley Envtl. Coalition,
    Inc. v. U.S. Army Corps of Eng’rs ("OVEC"), 
    883 F. Supp. 2d 627
    , 642-44 (S.D. W. Va. 2012). It also found that the Corps
    analyzed a "wide array of evidence about water quality" to
    reach a reasoned decision that the individual and cumulative
    environmental impacts of the Corps’ CWA § 404 permit
    4       OHIO VALLEY ENVIRONMENTAL v. U. S. ARMY CORPS
    would not rise to the level of significance required to trigger
    the need for an environmental impact statement. 
    Id. at 645. As
    the district court concluded, "[t]he Corps has analyzed the
    cumulative impacts, ‘articulated a satisfactory explanation for
    its conclusion,’ and thus has not acted arbitrarily or capri-
    ciously." 
    Id. (quoting Ohio Valley
    Envtl. Coalition v. Ara-
    coma Coal Co., 
    556 F.3d 177
    , 209 (4th Cir. 2009)).
    For the reasons that follow, we affirm.
    I
    The mining operation proposed at the Reylas mine would
    involve removing mountaintop rock that covers the coal
    seams to be mined, placing the rock in the adjacent valley,
    extracting the coal, and replacing the rock on the mountain-
    top. See Bragg v. W. Va. Coal Ass’n, 
    248 F.3d 275
    , 286 (4th
    Cir. 2001) (describing the process). Because the rock is bro-
    ken up as it is removed from the mountaintop, its volume
    swells such that all of the rock would not be needed to restore
    the mountaintop. The excess rock, or overburden, would
    accordingly be left in the valley as permanent fill. See Ken-
    tuckians for the Commonwealth, Inc. v. Rivenburgh, 
    317 F.3d 425
    , 431 (4th Cir. 2003). A sediment pond, as was typical,
    would be constructed below the valley fill to collect water
    until the valley fill is stabilized. See Aracoma 
    Coal, 556 F.3d at 186
    . In connection with the Reylas mine, the overburden
    rock would be deposited in a valley that includes a stream cal-
    led Reylas Fork. Reylas Fork flows into Bandmill Hollow,
    which in turn flows into Dingess Run. The Dingess Run
    watershed was the relevant area for assessing the mine’s
    cumulative impact.
    To operate the Reylas mine, Highland Mining obtained a
    SMCRA permit from the WVDEP, a state agency that has
    assumed "exclusive jurisdiction over the regulation of surface
    coal mining and reclamation operations" on nonfederal lands.
    30 U.S.C. § 1253(a). Highland Mining also obtained from the
    OHIO VALLEY ENVIRONMENTAL v. U. S. ARMY CORPS          5
    WVDEP a permit under CWA § 401, certifying that the dis-
    charge from the mine will be consistent with the State’s
    water-quality standards, and a permit under CWA § 402,
    authorizing the discharge of pollutants other than dredged or
    fill material into navigable waters. Finally, Highland Mining
    obtained a permit under CWA § 404 from the Corps to allow
    "the discharge of dredged or fill material into the navigable
    waters at specified disposal sites." 33 U.S.C. § 1344(a).
    Under guidelines issued by the EPA, the Corps could issue
    a § 404 permit only after concluding that the mining activity
    would not cause or contribute to violations of the State’s
    water-quality standards or to the significant degradation of
    waters of the United States. 40 C.F.R. § 230.10(b)(1), (c). In
    making that assessment, it had to comply with the National
    Environmental Policy Act ("NEPA") and take a "hard look"
    at the potential environmental consequences of the activity.
    See Robertson v. Methow Valley Citizens Council, 
    490 U.S. 332
    , 350 (1989). NEPA required federal agencies such as the
    Corps to prepare an environmental impact statement ("EIS")
    for major federal actions that significantly affect the quality
    of the human environment. 42 U.S.C. § 4332(C). To decide if
    an EIS was required, the Corps had to prepare an environmen-
    tal assessment. 33 C.F.R. § 230.10; 40 C.F.R. § 1501.3. If,
    after conducting the assessment, the Corps found that the pro-
    posed project would not, either individually or cumulatively,
    have a significant impact on human health or the environ-
    ment, it could make a "finding of no significant impact"
    ("FONSI"), obviating the need for preparing an EIS. 33
    C.F.R. § 230.11; see also 40 C.F.R. § 1508.13 (describing the
    contents of a FONSI).
    Before evaluating Highland Mining’s application for a
    § 404 permit, the Corps gave public notice of the application
    and invited comment. The Environmental Coalition—
    consisting of Ohio Valley Environmental Coalition, Inc.;
    West Virginia Highlands Conservancy, Inc.; Sierra Club; and
    Coal River Mountain Watch, Inc.—submitted comments
    6     OHIO VALLEY ENVIRONMENTAL v. U. S. ARMY CORPS
    opposing Highland Mining’s application. The Coalition main-
    tained that the disturbance from the Reylas mine would be
    ecologically significant, as the "sheer volume of disturbance
    in the region had already indicated significant degradation and
    would only be made worse by additional mining." The EPA
    also submitted comments stating that "this proposal is likely
    to cause or contribute to an excursion from the State’s water
    quality standards downstream resulting in an impairment of
    the aquatic life use." The EPA warned that "the direct and
    cumulative impacts from this and future mines will be persis-
    tent and permanent and can not be sufficiently or effectively
    compensated through the proposed mitigation."
    After receiving the EPA’s comments, Highland Mining
    requested that the Corps stay its consideration of the permit
    application until Highland Mining had an opportunity to allay
    the EPA’s concerns. Thereafter, the Corps, the EPA, and
    Highland Mining consulted each other and agreed to modifi-
    cations to the conditions of the permit. Under the agreement
    reached, Highland Mining would eliminate approximately
    400 feet of impact to Reylas Fork and apply a mitigation plan
    involving best management practices and monitoring. After
    the Corps made these changes, the EPA advised the Corps,
    "We believe that with appropriate permit conditions that the
    applicant could move forward with the issuance of the per-
    mit."
    The Corps released its Combined Decision Document and
    § 404 permit on March 4, 2011, in which it included a FONSI
    with respect to the Reylas mine.
    The Environmental Coalition shortly thereafter commenced
    this action against the Corps, its Commander, and its District
    Engineer, alleging that the Corps’ failure to require an EIS
    violated NEPA and was arbitrary and capricious "because the
    Corps failed to take a hard look at the environmental impacts
    of those projects." The Coalition also alleged that the Corps
    arbitrarily and capriciously concluded that the § 404 permit
    OHIO VALLEY ENVIRONMENTAL v. U. S. ARMY CORPS          7
    would not result in violations of West Virginia’s water-quality
    standards. The district court granted Highland Mining’s
    motion to intervene as a defendant.
    On cross-motions for summary judgment, the district court
    denied the Environmental Coalition’s motion for summary
    judgment; granted the Corps’ and Highland Mining’s cross-
    motions for summary judgment; and entered final judgment.
    
    OVEC, 883 F. Supp. 2d at 645
    . The court rejected the Coali-
    tion’s argument that the Corps, in conducting its analysis,
    "misapprehended" the baseline conditions of Dingess Run. 
    Id. at 642-44. It
    also rejected the Coalition’s NEPA challenge,
    finding that the Corps took the requisite "hard look." 
    Id. at 644. It
    noted that the Corps reasonably relied "on the exper-
    tise of the WVDEP, the agency with primary responsibility
    for water quality, in determining that impacts on water quality
    will be insignificant." 
    Id. at 645. The
    Environmental Coalition filed this appeal and at the
    same time requested that the district court issue an injunction
    to prevent Highland Mining from filling Reylas Fork valley
    pending appeal. When the district court denied the motion, the
    Coalition filed a similar motion in this court, which we too
    denied, by order dated September 24, 2012.
    II
    The Environmental Coalition contends first that the Corps,
    in determining the baseline conditions of the relevant water-
    shed, which was part of its analysis of the cumulative impact
    of the proposed mining activity, made "a material factual
    error" and "misapprehended" the baseline conditions. It
    explains:
    The Corps’ [Combined Decision Document] repeat-
    edly stated that [Dingess Run] had good water qual-
    ity, healthy aquatic life, and no significant mining
    impacts. . . . In fact . . . WVDEP has measured Din-
    8     OHIO VALLEY ENVIRONMENTAL v. U. S. ARMY CORPS
    gess Run as being in "poor" biological condition and
    listed its entire 7.4-mile length as an impaired water
    under § 303(d) of the CWA.
    This argument requires us to evaluate both the Combined
    Decision Document, in which the Corps makes its baseline
    assessment of current conditions in the relevant watershed,
    and the § 303(d) document, in which the WVDEP listed Din-
    gess Run as among the State’s impaired streams. But our
    review is limited to deciding whether the Corps considered
    the "relevant factors" when assessing the baseline conditions
    of the watershed. See Motor Vehicle Mfrs. Ass’n of U.S., Inc.
    v. State Farm Mut. Auto. Ins. Co., 
    463 U.S. 29
    , 43 (1983).
    In a 2010 report, the WVDEP included Dingess Run on its
    list of impaired streams for purposes of complying with CWA
    § 303(d). The WVDEP’s report explained that Dingess Run
    was included on the list based on measurements of a portion
    of a stream, using six benthic community metrics—i.e., met-
    rics evaluating the stream bed for biological life—which were
    combined into a "single multi-metric index." A stream scoring
    above 68 using that index was categorized as biologically
    unimpaired; a stream scoring between 60.6 and 68 fell within
    a "gray zone"; and a stream scoring less than 60.6 was consid-
    ered biologically impaired. Although the report found that
    Dingess Run was "impaired," it cautioned that the scope of its
    finding was limited:
    Most streams with low biological scores are listed as
    having an unknown source/cause of impairment on
    the 303(d) List and most are listed, by default, for
    their entire length. It is doubtful that the entire length
    of every stream is impaired, but without further data,
    the exact length of impairment is unknown.
    J.A. 327. Thus, the WVDEP § 303(d) list represented, based
    on limited data, the assessment that Dingess Run was "im-
    OHIO VALLEY ENVIRONMENTAL v. U. S. ARMY CORPS            9
    paired" when measured against the "single multi-metric
    index" and that the causes for the impairment were unknown.
    This impairment finding undoubtedly raises the question of
    whether Dingess Run would be able to assimilate the effects
    of the Reylas mine, particularly the effects of the valley fill
    that was the subject of the Corps’ § 404 permit. Two distinct
    analyses conducted in the Combined Decision Document,
    however, convince us that the Corps addressed the question
    only after considering the relevant data about baseline condi-
    tions and properly assessing them. First, the Corps analyzed
    the conditions at the fill site itself. And second, the Corps rec-
    ognized and analyzed the impaired conditions of the streams
    in the relevant watershed.
    In its analysis of the conditions at the site of Reylas mine
    fill, the Corps exhaustively reviewed the relevant data, report-
    ing:
    The streams proposed for impact at the site have
    perennial, intermittent and ephemeral flow regimes.
    The perennial and intermittent streams exhibit rela-
    tively good water quality based on analytical meth-
    ods developed and approved by the USEPA and
    WVDEP. . . . Based on USEPA’s Rapid Bioassess-
    ment Protocol, the streams fall in the middle range
    of "fair-good" range for habitat features, and have
    good West Virginia Stream Condition Index
    (WVSCI scores). The ephemeral streams lack suffi-
    cient water flow to conduct these analyses. Within
    the perennial and intermittent streams, the macroin-
    vertebrate analysis indicates a good benthic commu-
    nity [representing the vitality of the stream bed] with
    good diversity with a dominance of shredders.
    Approximately 6% of the species were comprised of
    the sensitive mayfly species. The presence of these
    types of benthic species indicates the stream has the
    ability to provide functions such as transport of
    10     OHIO VALLEY ENVIRONMENTAL v. U. S. ARMY CORPS
    nutrients, decomposition of organic input/detritus,
    and food web support. Overall, the perennial and
    intermittent stream channels located on-site are of
    good quality and do provide several important func-
    tions. The ephemeral streams, due to their lack of
    flow throughout the majority of the year, do not pro-
    vide these same functions.
    J.A. 180-81. The Corps followed up this summary by detail-
    ing the supporting data collected with respect to "physical
    habitat," "water quality," "benthics," and "stream function-
    ing."
    With respect to physical habitat, the Corps found that,
    overall, five of the eight streams proposed for impact exhib-
    ited good physical habitat, despite previous logging and deep
    mine activities at the site.
    With respect to water quality, the Corps referred to data
    collected in April 2004 and July 2007. The 2004 samplings
    were conducted during the rainy season and presented
    overall good water quality for the majority of param-
    eters tested. Two sites, located within the perennial
    segments, had slightly elevated conductivities [dis-
    solved salts], while the site located higher in the
    watershed had a relatively low conductivity reading.
    J.A. 203. The samplings revealed that magnesium was higher
    than recommended but concluded:
    Although these parameters are slightly high, they do
    not appear to have resulted in adverse effects on the
    benthic communities at the sample sites as the data
    indicates thriving benthic communities.
    
    Id. The 2007 sampling
    found that the conductivities were
    higher, although magnesium levels remained similar to the
    OHIO VALLEY ENVIRONMENTAL v. U. S. ARMY CORPS          11
    2004 levels. As to the water quality aspect, the Corps con-
    cluded:
    Overall, water quality on-site is good with the excep-
    tion of elevated conductivity and magnesium read-
    ings in the lower perennial and intermittent sections
    of Reylas Fork. Based on data obtained in down-
    stream segments of Bandmill Hollow, the receiving
    stream and Dingess Run magnesium levels fall
    within acceptable parameters established by
    WVDEP.
    
    Id. With respect to
    benthics, the Corps noted that, based on
    testing conducted in April 2004 and July 2007, "the benthic
    community within the perennial and intermittent stream chan-
    nels contained good benthic communities although there were
    slight differences in species diversity." J.A. 203. The Corps
    stated:
    [T]he unnamed first right tributary of Reylas Fork
    presented the most diverse benthic community how-
    ever the WVSCI scores indicated very good biologi-
    cal integrity at each sampling location. The
    remaining streams proposed for impact are ephem-
    eral and did not contain benthic communities. Over-
    all, the intermittent and perennial stream channels at
    the site contain good aquatic habitat despite the
    slightly elevated levels of conductivity and magne-
    sium present in several of the streams at the site.
    
    Id. Finally, with respect
    to stream functioning, the Corps found
    that "the majority of streams proposed for impacts are fully
    functional and of high quality based primarily on their posi-
    tion within the landscape, and how the stream interacts with
    12     OHIO VALLEY ENVIRONMENTAL v. U. S. ARMY CORPS
    geology, hydrology and soils, which influence biotic and
    physical processes." J.A. 207.
    With the specific water data evaluated and the impairments
    noted, the Corps’ Combined Decision Document concluded
    with a summary that the streams at the impact site
    are of good quality with good physical aquatic habi-
    tat, good riparian cover, good water quality (with the
    exception of elevated conductivity and magnesium
    levels) and viable benthic communities.
    J.A. 209.
    After looking at site-specific factors, the Corps turned its
    attention to the Dingess Run watershed as a whole. It recog-
    nized, at the outset, that "deep and surface coal mining and
    timber removal activities have been on-going within the Din-
    gess Fork Watershed . . . for the past 150 years." J.A. 247.
    Because most of this activity was unregulated, "many areas
    within the Appalachian Coal Fields have been adversely
    impacted by these activities." 
    Id. The Corps stressed
    the
    importance of these earlier mining activities:
    These pre-SMCRA and pre-CWA impacts are rele-
    vant as they have set a baseline condition for water
    quality and aquatic habitat values within the water-
    shed. They also provide the context for purposes of
    assessing the significance of impacts in our NEPA
    analysis.
    
    Id. (emphasis added). Taking
    this history into account, the Corps then considered
    water-quality testing data provided by Highland Mining "from
    eight baseline surface monitoring sites located on Bandmill
    Hollow, as well as seven streams which flow into Dingess
    Run." J.A. 247.
    OHIO VALLEY ENVIRONMENTAL v. U. S. ARMY CORPS          13
    The Corps’ cumulative analysis thus considered data not
    only from the impact area, but also from other tributaries. The
    sampling from Bandmill Hollow, the area that would be
    directly impacted by the Reylas mine valley fill, indicated ele-
    vated levels of conductivity. See J.A. 203; J.A. 254. The sam-
    plings from other upstream tributaries of Dingess Run
    revealed "slightly elevated selenium levels." J.A. 248; see
    also J.A. 253. Thus, the Corps acknowledged that the data
    indicated a level of impairment. But it concluded that this
    level of impairment did not prevent the streams in the Dingess
    Run watershed from absorbing the impacts of past mining:
    [D]espite past unregulated mining, which has
    impacted the relevant environment and provides the
    context for this assessment, the watershed is heavily
    forested and continues to provide a functioning
    aquatic ecosystem with good water quality.
    J.A. 256-57. Taking into account the historical damage as
    well as current sampling, the Corps found that "[r]ecent water
    quality and biological data has indicated the watershed is suf-
    ficiently absorbing the impacts without significant aquatic
    impairment and/or degradation." J.A. 256.
    These observations and assessments do not support the
    Environmental Coalition’s claim that the Corps "misappre-
    hended" existing conditions. The Corps’ conclusion that the
    Dingess Run watershed had good water quality was a contex-
    tual judgment made after considering all relevant data. More-
    over, the Corps’ discussion of the baseline conditions was
    more exhaustive than that found in West Virginia’s discussion
    made in connection with its § 303(d) list and not necessarily
    in tension with it. Specifically, the Corps recognized that the
    watershed had elevated levels of conductivity and selenium.
    See J.A. 203-07 (identifying elevated levels of conductivity);
    J.A. 248 (acknowledging "slightly elevated selenium levels");
    J.A. 253 ("Several streams have exhibited elevated selenium
    levels during some sampling events"); J.A. 254 (recognizing
    14     OHIO VALLEY ENVIRONMENTAL v. U. S. ARMY CORPS
    high conductivity levels). The § 303(d) document, on the
    other hand, was not pollutant-specific, concluding only that
    the Dingess Run was "impaired."
    We thus find no merit to the Environmental Coalition’s
    claim that the Corps "misapprehended" the baseline condi-
    tions. The Corps considered the relevant factors, evaluating
    both the impact site and the entire watershed. Only after this
    evaluation did the Corps reach its informed judgment as to the
    baseline conditions.
    III
    For its second argument, the Environmental Coalition con-
    tends that the Corps’ finding of cumulative insignificance was
    "arbitrary and capricious" because the Corps irrationally dis-
    missed the strong correlation between surface coal mining
    activities and downstream biological impairment. Under the
    Coalition’s reading of the Combined Decision Document, the
    Corps failed to take a "hard look" at potential environmental
    consequences because the Document is "not supported by any
    reasoned analysis of, or expert opinion about, the science on
    conductivity and stream impairment." Stated otherwise, the
    Coalition challenges the rationality of the Corps’ predictive
    judgment that the valley fill from the Reylas mine will not
    have a cumulatively significant impact on the streams in the
    Dingess Run watershed.
    The district court rejected the Environmental Coalition’s
    argument, observing that the Corps had before it
    a wide array of evidence about water quality and the
    effects of conductivity including the SMCRA per-
    mit, the NPDES permit, the § 401 certification, and
    the studies provided by the Plaintiffs and the EPA.
    The [Combined Decision Document] reflects a sub-
    stantive review of these materials, after which the
    Corps concluded that the individual and cumulative
    OHIO VALLEY ENVIRONMENTAL v. U. S. ARMY CORPS            15
    environmental impacts of this permit would not rise
    to the level of significance required to trigger an EIS.
    
    OVEC, 883 F. Supp. 2d at 645
    . The court thus concluded that
    the Corps had "analyzed the cumulative impacts, ‘articulated
    a satisfactory explanation for its conclusion,’ and thus has not
    acted arbitrarily or capriciously." 
    Id. (quoting Aracoma, 556
    F.3d at 209).
    In assessing whether a project’s impacts will be significant,
    the Agency must take a "hard look" at potential environmen-
    tal consequences. Robertson v. Methow Valley Citizens Coun-
    cil, 
    490 U.S. 332
    , 350 (1989). "The hallmarks of a ‘hard look’
    are thorough investigation into environmental impacts and
    forthright acknowledgment of potential environmental
    harms." Nat’l Audubon Soc’y v. Dep’t of Navy, 
    422 F.3d 174
    ,
    185 (4th Cir. 2005).
    In this case, the Corps collected the competing views of the
    Environmental Coalition, the EPA, the WVDEP, and High-
    land Mining and examined them in some detail, along with
    the supporting data. Indeed, a substantial portion of the Com-
    bined Decision Document is dedicated to addressing water
    quality and the cumulative effect of the Reylas mine fill on
    water quality. The Corps devoted four years to the effort,
    meeting repeatedly with the parties to resolve concerns,
    prompting the district court to observe:
    The administrative record documents the extensive
    interaction among the Corps, the EPA, the WVDEP
    and Highland to resolve the EPA’s concerns. Though
    Highland and the WVDEP disputed the EPA’s posi-
    tion on conductivity and cumulative water quality
    impacts of valley fills, the Corps focused on site-
    specific factors which provide at least a rational
    basis for its decision.
    
    OVEC, 883 F. Supp. 2d at 644
    .
    16    OHIO VALLEY ENVIRONMENTAL v. U. S. ARMY CORPS
    In response to the EPA’s concerns, the Corps adopted mea-
    sures agreeable to the EPA as conditions of its § 404 permit,
    involving reduction of the fill and post-permit monitoring and
    other mitigation requirements. These special conditions incor-
    porated a series of best management practices designed to
    minimize increases in conductivity and total dissolved solids
    associated with the mining activities of Highland Mining. The
    conditions also required that if the monitoring showed that the
    mining activities were resulting in adverse impacts to water
    quality, Highland Mining would be required to initiate reme-
    dial actions, provide additional water quality-based mitigation
    under the terms of the permit, or both. J.A. 265-66. All of
    these conditions were incorporated as conditions of the § 404
    permit. This accommodation process was significant and,
    indeed, resulted in a two-year delay of the issuance of the
    § 404 permit.
    In addition to these modifications to the § 404 permit, the
    Corps’ Combined Decision Document gave a "hard look" at
    conductivity and water quality more generally. After reciting
    the history of mining in the Dingess Run watershed over the
    period of 150 years and its impact, the Document evaluated
    the data from various sources which indicated that the water-
    shed would still be able to absorb the impacts of the Reylas
    mine without significant aquatic impairment or degradation.
    The Document specifically discussed the elevated levels of
    conductivity and selenium in the streams. As to the selenium,
    it concluded that the source of selenium in that area is located
    "in a stratum or strata located in rock formations higher in ele-
    vation than those proposed to be mined as part of this proj-
    ect," J.A. 248, so that the selenium level would not be
    increased by the mine. And as to conductivity, the Document
    compared elevated conductivity levels found in areas down-
    stream of other valley fills with those of streams containing
    no valley fills. It found that "benthic microinvertebrate com-
    munities do become established downstream of valley fills
    and often are comparable to those communities in un-
    OHIO VALLEY ENVIRONMENTAL v. U. S. ARMY CORPS          17
    impacted stream channels." J.A. 254. Indeed, the conclusions
    were supported in part by a study that showed that streams
    below valley fills sometimes did better than the streams con-
    stituting the reference sites. J.A. 262.
    At bottom, the Document reached the conclusion that "the
    valley fill, sediment pond, and mine through activities, if con-
    ducted in accordance with all applicable state and Federal reg-
    ulations, should not contribute to or result in cumulative
    significant adverse impacts to the aquatic or human environ-
    ment within the Dingess Run Watershed." J.A. 256.
    Thus, contrary to the Environmental Coalition’s contention
    that the Corps failed to take a hard look at conductivity and
    stream impairment, the record amply shows that the Corps
    grappled with the issue extensively, rationally finding that (1)
    the connection between conductivity and stream impairment
    was not strong enough to preclude a permit and (2) the com-
    promise measures agreed to by the EPA and Highland Mining
    would successfully mitigate the potential for adverse effects.
    With the inability to demonstrate that the Corps failed to
    take a "hard look," the Environmental Coalition’s arguments
    are reduced to no more than a substantive disagreement with
    the Corps. But our review is limited, and we may not "use
    review of an agency’s environmental analysis as a guise for
    second-guessing substantive decisions committed to the dis-
    cretion of the agency." Nat’l Audubon 
    Soc’y, 422 F.3d at 185
    (citing 
    Robertson, 490 U.S. at 350
    ).
    The Corps’ predictive judgment in this case was based on
    facts and recommendations, adduced during a lengthy consul-
    tation between the Corps, Highland Mining, the EPA, and the
    WVDEP, and we conclude that this process satisfies NEPA’s
    procedural requirement to take a "hard look." See Hughes
    River Watershed Conservancy v. Johnson, 
    165 F.3d 283
    , 288
    (4th Cir. 1999) ("[A]n agency takes a sufficient ‘hard look’
    when it obtains opinions from its own experts, obtains opin-
    18       OHIO VALLEY ENVIRONMENTAL v. U. S. ARMY CORPS
    ions from experts outside the agency, gives careful scientific
    scrutiny and responds to all legitimate concerns that are
    raised" (citing Marsh v. Oregon Natural Resources Council,
    
    490 U.S. 360
    , 378-85 (1989))). Because the Corps’ analysis
    satisfied NEPA’s procedural requirements, the Corps’ finding
    of cumulative insignificance is neither arbitrary nor capri-
    cious. See Aracoma 
    Coal, 556 F.3d at 209
    .
    Accordingly, we affirm the judgment of the district court.
    AFFIRMED
    WILKINSON, Circuit Judge, concurring:
    Several aspects of the record are troubling in this case: the
    EPA’s March 2009 comments, the Dingess Run WVSCI
    score of 33, and the WVDEP’s listing of Dingess Run as an
    impaired waterway. But, on balance, they are not enough to
    reverse in light of the standard of review, the unfolding of the
    agency process, and the analysis in the Corps’ Combined
    Decision Document. I am thus pleased to concur in the major-
    ity opinion. I write separately, however, to underscore two
    critical points in the analysis.
    I.
    First, in March of 2009, the EPA stated that it had "signifi-
    cant concern regarding the impact to the human environment"
    from the proposed mining project. J.A. 109. The question then
    becomes whether a court should seize upon this assessment as
    a basis for vacating the later grant of the fill permit under the
    Clean Water Act. If we were to do so under these circum-
    stances, I fear we would stifle the very agency candor and
    applicant responsiveness that is essential to the proper func-
    tioning of the administrative process and, ultimately, to the
    goal of natural resource protection.
    Here, for instance, the EPA’s March 2009 objections to
    Highland Mining’s initial permit application precipitated an
    OHIO VALLEY ENVIRONMENTAL v. U. S. ARMY CORPS          19
    extended dialogue among the Corps, the EPA, and Highland.
    The product of this discussion was meaningful concessions
    from Highland and the Corps that were responsive to the
    EPA’s stated apprehensions. Specifically, Highland and the
    Corps agreed to a more extensive mitigation plan for the proj-
    ect site, additional testing and monitoring of water quality in
    and around the site, and a number of best management prac-
    tices to be employed in operating the mine. See Maj. Op. at
    6, 15-16. Following these modifications, the EPA concluded
    in September 2009 that Highland and the Corps "could move
    forward with issuance of the permit." J.A. 144. But for the
    EPA’s March 2009 comment letter, the foregoing corrective
    measures might not have been considered.
    Even after this litigation commenced, the agency dialogue
    continued. In April 2011, the Corps determined that the chal-
    lenged permit merited "further consideration" and filed an
    unopposed motion for voluntary remand in the district court.
    The Corps and Highland then engaged in additional commu-
    nication regarding the project’s potential environmental
    impact and Highland’s associated mitigation efforts. This
    exchange led to further evaluation of operating practices at
    the proposed mine, with the Corps ultimately concluding that
    "[i]mpacts to the waters of the U.S. associated with the pro-
    posal have been minimized to the maximum extent practica-
    ble regardless of the designated [post-mine land use]." Status
    Report, No. 3:11-cv-00149, ECF No. 45, at 7 (S.D.W. Va.
    Sept. 20, 2011).
    There is a limit to the extent that courts can direct the CWA
    process, given the episodic nature of our involvement, the
    standard of review, and the lack of our own extensive scien-
    tific expertise. We can, however, try to adjust incentives in a
    manner that facilitates the protection of natural resources in
    the course of agency deliberation. The administrative process
    works best when interested parties are comfortable sharing
    information that can shed light on issues affecting the ultimate
    outcome. Were we to jump on the EPA’s March 2009 com-
    20    OHIO VALLEY ENVIRONMENTAL v. U. S. ARMY CORPS
    ments, the single low WVSCI score, or the Corps’ earlier
    request for voluntary remand as a basis for reversing the
    Corps’ decision, it would discourage honest conversation and
    meaningful corrective actions in future cases.
    Accordingly, rather than utilize judicial review in a manner
    that encourages regulators or those they regulate to sweep
    adverse evidence under the rug, our affirmance here encour-
    ages them to keep the dialogue above board and disclose even
    problematic information so that the appropriate parties can
    take steps to address any underlying environmental concerns.
    There will, of course, be cases where substantial evidence
    fails to support the Corps’ decision to dispense with an envi-
    ronmental impact statement, but I cannot conclude the Corps
    acted arbitrarily in granting the CWA permit here after pro-
    longed, but productive, deliberation.
    II.
    When an agency is tasked with determining the environ-
    mental impact of a project upon an ecological setting that is
    already the situs of other activity, there is a real danger that
    the agency’s appraisal may fail to take a wide enough view
    of the collective impact of all of the environmental effects that
    the location has experienced over time. Recognizing the risk
    that an agency may proceed with too myopic a focus on the
    singular effects of the particular project before it, NEPA calls
    for an EIS if a project produces a "cumulatively significant
    impact" in tandem with other activity. 40 C.F.R.
    § 1508.27(b)(7) (emphasis added). This cumulative impact
    requirement, however, is not one with which agencies always
    comply. See Grand Canyon Trust v. FAA, 
    290 F.3d 339
    , 342-
    43 (D.C. Cir. 2002) (discussing cases where agencies have
    failed to consider cumulative impact).
    Here, by contrast, the record demonstrates that the Corps
    gave full consideration not just to the incremental effects of
    the proposed valley fill, but also to its cumulative effects. See
    OHIO VALLEY ENVIRONMENTAL v. U. S. ARMY CORPS         21
    Maj. Op. at 12-13. The CDD thus included an in-depth dis-
    cussion regarding the cumulative impacts of the proposed
    project. The Corps considered the "impacts associated with
    the [project] when added to other past, present, and reason-
    ably foreseeable future impacts." J.A. 246. It ultimately con-
    cluded that, in light of the evidence in the record, "it is not
    expected that the Reylas Surface Mine would, when com-
    bined with other mining activities within the Dingess Run
    Watershed, result in significant cumulative impacts to the
    human and/or aquatic environment." J.A. 256. Again, I cannot
    conclude after careful review of this record that the required
    cumulative impact assessment was arbitrarily ignored.
    III.
    The Corps has been tasked with regulating mineral extrac-
    tion in West Virginia in a way that respects the extraordinary,
    but fragile, environmental and natural resources of that state.
    Here, the record demonstrates a frankness in the agency dia-
    logue that resulted in a greater respect for NEPA’s basic aims.
    Given the corrective measures ultimately taken, I believe it
    would be counterproductive to leap upon the earlier EPA and
    Corps reservations as a reason to reverse. To do so would pro-
    duce darkness in the process, not light. Of course, the judi-
    ciary is not a rubber stamp on agency action, and there are
    times when contrary evidence will either not support or will
    actively undercut an agency’s decision. But this is not one of
    those cases. I therefore concur in the majority’s opinion and
    in its decision to affirm.