Ohio Valley Environmental Coalition v. Fola Coal Company, LLC ( 2017 )


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  •                               PUBLISHED
    UNITED STATES COURT OF APPEALS
    FOR THE FOURTH CIRCUIT
    No. 16-1024
    OHIO   VALLEY   ENVIRONMENTAL   COALITION;      WEST     VIRGINIA
    HIGHLANDS CONSERVANCY; and SIERRA CLUB,
    Plaintiffs - Appellees,
    v.
    FOLA COAL COMPANY, LLC,
    Defendant - Appellant.
    ------------------------------------
    AMERICAN FOREST AND PAPER ASSOCIATION; AMERICAN PETROLEUM
    INSTITUTE; NATIONAL ASSOCIATION OF CLEAN WATER AGENCIES;
    NATIONAL ASSOCIATION OF HOME BUILDERS; NATIONAL ASSOCIATION
    OF MANUFACTURERS; NATIONAL MINING ASSOCIATION; UTILITY WATER
    ACT GROUP,
    Amici Supporting Appellant.
    Appeal from the United States District Court for the Southern
    District of West Virginia, at Charleston.  Robert C. Chambers,
    Chief District Judge. (2:13-cv-05006)
    Argued:   October 27, 2016                 Decided:    January 4, 2017
    Before MOTZ and DIAZ, Circuit Judges, and Gerald Bruce LEE,
    United States District Judge for the Eastern District of
    Virginia, sitting by designation.
    Affirmed by published opinion. Judge Motz wrote the opinion, in
    which Judge Diaz and Judge Lee joined.
    ARGUED: Michael Shane Harvey, JACKSON KELLY PLLC, Charleston,
    West Virginia, for Appellant.      Joseph Mark Lovett, APPALACHIAN
    MOUNTAIN ADVOCATES, Lewisburg, West Virginia, for Appellees.
    Thomas M. Johnson, Jr., OFFICE OF THE ATTORNEY GENERAL OF WEST
    VIRGINIA, Charleston, West Virginia, for Amici The State of West
    Virginia   and    West    Virginia   Department    of   Environmental
    Protection.    ON BRIEF: Robert G. McLusky, Jennifer L. Hughes,
    JACKSON KELLY PLLC, Charleston, West Virginia, for Appellant.
    J. Michael Becher, APPALACHIAN MOUNTAIN ADVOCATES, Lewisburg,
    West Virginia; James M. Hecker, PUBLIC JUSTICE, Washington,
    D.C., for Appellees.     Karen C. Bennett, Samuel L. Brown, Brian
    R. Levey, Kristy Bulleit, HUNTON & WILLIAMS LLP, Washington,
    D.C.; Jan A. Poling, AMERICAN FOREST & PAPER ASSOCIATION,
    Washington,   D.C.;    Amanda   Waters,   Erica   Spitzig,   NATIONAL
    ASSOCIATION OF CLEAN WATER AGENCIES, Washington, D.C.; Linda E.
    Kelly, Quentin Riegel, NATIONAL ASSOCIATION OF MANUFACTURERS,
    Washington, D.C.; Peter Tolsdorf, AMERICAN PETROLEUM INSTITUTE,
    Washington, D.C.; Tom Ward, NATIONAL ASSOCIATION OF HOME
    BUILDERS, Washington, D.C., for Amici American Forest & Paper
    Association, American Petroleum Institute, National Association
    of Clean Water Agencies, National Association of Home Builders,
    National    Association     of   Manufacturers,     National   Mining
    Association and Utility Water Act Group.            John C. Cruden,
    Assistant   Attorney    General,   David   S.   Gualtieri,   Jennifer
    Neumann, Environment and Natural Resources Division, UNITED
    STATES DEPARTMENT OF JUSTICE, Washington, D.C., for Amicus
    United   States    Environmental    Protection   Agency.      Patrick
    Morrisey, Attorney General, Elbert Lin, Solicitor General, Erica
    N. Peterson, Assistant Attorney General, OFFICE OF THE ATTORNEY
    GENERAL OF WEST VIRGINIA, Charleston, West Virginia; Kristin
    Boggs, General Counsel, Thomas L. Clarke, Senior Policy Advisor
    and   Counsel,    WEST    VIRGINIA   DEPARTMENT    OF   ENVIRONMENTAL
    PROTECTION, Charleston, West Virginia, for Amici The State of
    West Virginia and West Virginia Department of Environmental
    Protection.
    2
    DIANA GRIBBON MOTZ, Circuit Judge:
    Several environmental groups brought this action against a
    coal company, alleging that the company had violated the Clean
    Water Act and seeking appropriate injunctive relief.                        After a
    bench    trial,   the    district    court     found    that     the    company   had
    indeed    violated      the   Act   and    ordered     it   to   take    corrective
    measures.    The company appeals, principally asserting that its
    National Pollution Discharge Elimination System (“NPDES”) permit
    shields it from liability.           Because the company did not comply
    with the conditions of its permit, the permit does not shield it
    from liability under the Clean Water Act, and the district court
    properly ordered appropriate remedial measures.                   Accordingly, we
    affirm the judgment of the district court.
    I.
    A.
    The Clean Water Act forbids all discharges of pollutants
    into waters of the United States, unless the discharger holds a
    permit.     33 U.S.C. §§ 1311(a), 1342, 1362 (2012).                        The Act
    shields NPDES permit holders from liability if their discharges
    comply with their permits.                33 U.S.C. § 1342(k).            A typical
    NPDES permit lists numerical limitations on specific types of
    effluents and includes other conditions required for compliance
    with state and federal law.                The Act requires that effluent
    3
    limits    reflect        applicable        water         quality       standards.      See   33
    U.S.C.     § 1312(a).            These      water         quality        standards    may     be
    numerical or narrative, 40 C.F.R. § 131.3(b) (2016), and may,
    but need not be, contained in a permit.
    Under    the     Act,    if    a    state        receives       approval     from    the
    Environmental Protection Agency (“EPA”), it can administer its
    own NPDES permitting program.                       See 33 U.S.C. § 1342(b).                 EPA
    reviews and must approve any substantive changes to a state’s
    permit program.              See 
    id. In 1981,
    West Virginia received EPA
    approval to administer its own permit program and has done so
    ever since.
    West    Virginia        has    promulgated          a    number     of     regulations
    necessary to comply with the national NPDES program.                                 All West
    Virginia        NPDES    permits       incorporate          (either       expressly    or    by
    reference)       numerous       provisions          of    the    West     Virginia    Code    of
    State Rules.            These include a series of regulations governing
    NPDES    permits        in    general,     as   well        as     a    separate    series   of
    regulations governing NPDES permits for coal mining.                                   Compare
    W. Va. Code R. § 47-10 (2016) (general NPDES regulations), with
    W. Va. Code R. § 47-30 (coal mine NPDES regulations).
    In 1996, Fola Coal Company, LLC obtained a West Virginia
    NPDES coal mine permit to discharge into Stillhouse Branch, a
    tributary of Twentymile Creek and a waterway adjacent to Fola’s
    surface mining facility in central West Virginia.                                Fola applied
    4
    for and received a renewed NPDES permit in 2009.                              The provisions
    of that permit lie at the heart of this case.
    B.
    On    March    13,   2013,      three      environmental          groups     --    Ohio
    Valley        Environmental        Coalition,            West        Virginia      Highlands
    Conservancy, and Sierra Club (collectively “the Coalition”) --
    filed    this       action   under      the   Clean      Water        Act’s    citizen    suit
    provision, 33 U.S.C. § 1365.                  The Coalition alleged that Fola
    violated       5.1.f,    a     West     Virginia        regulation       incorporated       in
    Fola’s permit.          At the time Fola’s renewal permit was issued in
    2009, 5.1.f provided:
    The discharge or discharges covered by a WV/NPDES
    permit are to be of such quality so as not to cause
    violation   of  applicable  water   quality  standards
    adopted by the Department of Environmental Protection,
    Title 47, Series 2.
    W. Va. Code R. § 47-30-5.1.f (2009).                     The Coalition alleged that
    Fola     violated       5.1.f     by     discharging          ions      and    sulfates     in
    sufficient          quantities     to     cause         increased        conductivity        in
    Stillhouse       Branch,       which     resulted        in     a    violation     of     water
    quality standards.              Specifically, the Coalition asserted that
    Fola’s discharges violated two narrative water quality standards
    contained       in    Fola’s     permit.          See    
    id. §§ 47-2-3.2.e,
         -3.2.i
    (2016); see infra n.8.
    In response to the Coalition’s allegations, Fola pointed
    out    that    it     disclosed    the    nature        of    its     discharges     when   it
    5
    applied for the 2009 renewal permit.                              At that time, Fola had
    stated that its discharges would include ions and therefore be
    highly conductive.             Despite this disclosure, the West Virginia
    Department of Environmental Protection (“WVDEP”) set no specific
    limitations on conductivity in Fola’s permit.                                      By declining to
    do so, Fola asserted, WVDEP made an affirmative choice not to
    impose    any     limit       on     conductivity.                According          to     Fola,    it
    followed     that          5.1.f     did     not       obligate         Fola        to    limit      the
    conductivity          of     its     discharges          even       if     that          conductivity
    resulted    in     a       violation       of   water        quality       standards.               Fola
    reasoned    that,          because    it     complied         with       the       effluent    limits
    expressly set out in its permit, the permit shielded it from all
    liability under the Act.
    To     gain       support       for     its       view       that     5.1.f         imposed      no
    obligation on it, in 2013 Fola sought clarification from WVDEP
    regarding    a     new       West    Virginia          law    enacted          a    year     earlier,
    involving       the    permit        shield.            The       new     law       provided        that
    “Notwithstanding             any      rule      or       permit          condition           to     the
    contrary, . . . compliance with a permit issued pursuant to this
    article shall be deemed compliance for purposes of” the Clean
    Water    Act’s     permit          shield.         2012      W.     Va.    SB       615     (formerly
    codified at W. Va. Code § 22-11-6(2) (2013)).                                      WVDEP responded
    that, in its view, this legislation did not substantively change
    existing    law       but    simply        clarified         West    Virginia’s            consistent
    6
    interpretation    of    the    permit       shield.         Under    this     assertedly
    consistent     view,    a     permit       holder      need    only        disclose     its
    discharges of effluents to WVDEP and comply with the effluent
    limits in the permit.          If the permit holder did this, according
    to WVDEP, the permit would shield the permit holder from all
    liability under the Clean Water Act.
    In 2015, WVDEP attempted to remove from 5.1.f the language
    at issue in this case, which requires permit holders to comply
    with water quality standards.              In doing so, WVDEP admitted that
    when the agency had issued Fola a renewal permit in 2009, 5.1.f
    “require[d]     coal    NPDES        permittees        to     meet        water   quality
    standards, whether or not such standards are delineated in the
    permit   or    contained       in    the        administrative        record      of    the
    permitting process.”          WVDEP, Response to Comments, 47 CSR 30,
    WV/NPDES Rule for Coal Mining Facilities, at 1 (2014), http://
    apps.sos.wv.gov/adlaw/csr/readfile.aspx?DocId=26342&Format=PDF.
    Nonetheless,    WVDEP       opined    that       its   removal       of    the    relevant
    language from 5.1.f “does nothing more than make [state law]
    consistent with” the Clean Water Act, which, according to WVDEP,
    did not require compliance with water quality standards.                          
    Id. Notwithstanding WVDEP’s
    views, EPA did not approve WVDEP’s
    attempted changes to 5.1.f.            Instead, in a series of letters to
    WVDEP, EPA explained its concerns that the elimination of the
    water quality standards language in 5.1.f could cause state law
    7
    to    conflict      with       federal     law       and    weaken    the     state’s       NPDES
    program.       WVDEP’s explanations did not assuage EPA’s concerns,
    and EPA did not approve any changes to 5.1.f or to any other
    language      incorporated          in    Fola’s      permit.         In    2015,     the    West
    Virginia Legislature enacted another provision similar to SB 615
    that    explicitly         prohibited        enforcing        water        quality    standard
    violations         against       permit    holders.          But     again,    EPA     did    not
    approve the removal of the relevant portion of 5.1.f or any
    similar changes to the state’s NPDES permit program that might
    affect Fola’s permit.
    Nevertheless, armed with WVDEP’s interpretation of SB 615
    and    the    legislative          actions      outlined       above,       Fola     urged   the
    district      court       to   hold      that    permit      provision       5.1.f     did    not
    prohibit       Fola       from     violating         West     Virginia        water    quality
    standards.          Fola further contended that it could not be held
    accountable         for    increased        conductivity           and     resulting        water
    quality      violations          because    the      effluents       it     discharged       fell
    within       the   numerical        levels      allowed       in   its      permit     or    were
    disclosed during the permitting process.
    C.
    After a bench trial, at which the district court considered
    mountains of expert testimony, reports, and charts, the court
    issued a thorough written opinion.                         The court found that 5.1.f
    constituted an enforceable permit provision that required Fola
    8
    to     refrain    from    violating     West     Virginia’s    water    quality
    standards,       including     the   narrative    water    quality     standards
    contained in §§ 47-2-3.2.e and -3.2.i.
    The court found that mine drainage like that which Fola
    discharged into Stillhouse Branch deposited significant amounts
    of ions into the receiving water. 1            Ohio Valley Envtl. Coalition,
    Inc. v. Fola Coal Co., 
    82 F. Supp. 3d 673
    , 686–87 (S.D. W. Va.
    2015).      These ions are measured by conductivity, 
    id. at 687,
    and
    the    conductivity      of   Stillhouse    Branch   had   markedly    increased
    since Fola began discharging mine drainage into the water, 
    id. at 696–98.
    As conductivity in Stillhouse Branch increased, the experts
    explained and the court found, sensitive insect species, which
    could not adapt to the sudden and dramatic change, died.                 
    Id. at 687.
          The decrease in aquatic diversity caused a decrease in the
    stream’s score on the West Virginia Stream Condition Index (“the
    1
    In order to extract coal, Fola blasted rock and dumped it
    into Stillhouse Branch. See Gregory J. Pond et al., Downstream
    Effects   of  Mountaintop   Coal   Mining:  Comparing  Biological
    Conditions Using Family- and Genus-Level Macroinvertebrate
    Bioassessment Tools, 27 J. N. Am. Benthological Soc’y 717, 718
    (2008) (explaining surface coal mining).     The minerals in the
    rock reacted with the flowing water to release calcium,
    bicarbonate, and sulfate ions.    See Emily S. Bernhardt et al.,
    How Many Mountains Can We Mine? Assessing the Regional
    Degradation of Central Appalachian Rivers by Surface Coal
    Mining, 46 Envtl. Sci. & Tech. 8115, 8115 (2012).
    9
    Index”), 2 which WVDEP and EPA had long used to measure the health
    of streams.       The court noted that EPA considered Index scores
    below 68 to indicate impairment and that, in 2009 when WVDEP
    issued Fola’s renewal permit, WVDEP had generally shared that
    view.      See    
    id. at 677,
        679    &   n.4.      The   trial    evidence
    established that since 2003 Stillhouse Branch had consistently
    scored well below 68, ranging from 31.6 to 58.17.                     
    Id. at 696.
    The     district      court        concluded      that   “when     conductivity
    reaches 300 [µS/cm], it is more likely than not that” the Index
    score    will    drop    below     68    and    “the   subject      stream   will   be
    biologically impaired.”            
    Id. at 687
    (citing EPA, A Field-Based
    Aquatic Life Benchmark for Conductivity in Central Appalachian
    Streams    (Final       Report),    EPA/600/R-10/023F,         at     A-36   (2011)).
    Samples from Stillhouse Branch reported conductivity that was
    ten times higher than this 300 µS/cm threshold.                      
    Id. at 696–98.
    The court found that Fola’s mining increased conductivity in
    Stillhouse      Branch    and    that     “high     conductivity      in   downstream
    Stillhouse Branch is causing -- or, at the very least materially
    contributing to -- a significant adverse impact to the chemical
    and biological components of the stream’s aquatic ecosystems” in
    2 See A Stream Condition Index for West Virginia Wadeable
    Streams 1-2 (2000), http://www.dep.wv.gov/WWE/watershed/bio_fish
    /Documents/WVSCI.pdf.
    10
    violation of the West Virginia narrative water quality standards
    incorporated into Fola’s permit.                    
    Id. at 698.
    With      respect      to     remedy,     the    district       court,     at    Fola’s
    urging,        rejected       the    Coalition’s           proposed     remedy        as     too
    burdensome.           Instead, the court appointed a Special Master of
    Engineering to monitor Fola’s implementation of less burdensome
    methods Fola proposed.              Fola timely noted this appeal.
    D.
    A    court      must    interpret       an     NPDES    permit    as     it     would    a
    contract.       Piney Run Pres. Ass’n v. Cty. Comm’rs, 
    268 F.3d 255
    ,
    269 (4th Cir. 2001).                Thus, to the extent that the judgment of
    the   district        court    rests     on    interpretation          of    Fola’s        NPDES
    permit, that interpretation constitutes a legal question, which
    we review de novo.             
    Id. But to
    the extent that judgment rests
    on factual findings made after a bench trial, we can reverse
    only if those findings are clearly erroneous.                         
    Id. II. Fola
        principally          contends        that     the      district           court
    misinterpreted its permit.
    In doing so, Fola presents a narrow argument.                            The company
    expressly       acknowledges         that     its    permit    “incorporates”          5.1.f.
    Reply     Br.    at    3.     Fola     admits       that    “permit    holders        are    not
    shielded from violations of permit conditions.”                             
    Id. at 1.
           And
    11
    the company forgoes any claim that 5.1.f does not impose water
    quality standards, including those found in 3.2.e and 3.2.i.
    Fola’s     sole    argument    is    that       5.1.f   controls      the    conduct    of
    WVDEP, the state regulator, and imposes no requirements on Fola,
    the regulated entity.
    Fola     offers      three     points        assertedly         supporting       this
    argument.      First, the company maintains that 5.1.f is ambiguous
    but   is    best    interpreted      as     a    regulation      of    the    permitting
    authority, not the permit holder.                   Second, Fola contends that
    the district court failed to examine “extrinsic evidence,” which
    it argues eliminates any ambiguity and demonstrates that, in the
    “contemplation       of    the      parties,”       5.1.f     clearly        imposed    no
    obligation on the permit holder.                  Finally, Fola claims that our
    holding and analysis in Piney Run requires a court to conclude
    that 5.1.f imposes obligations only on the permitting authority.
    We consider each of these arguments in turn.
    A.
    We    initially     examine     the       language    of    Fola’s      permit     to
    determine if it is indeed ambiguous.                    As we recognized in Piney
    Run, “if ‘the language [of a permit] is plain and capable of
    legal      construction,      the    language       alone   must       determine’      the
    permit’s meaning.”         Piney 
    Run, 268 F.3d at 270
    (quoting FDIC v.
    Prince George Corp., 
    58 F.3d 1041
    , 1046 (4th Cir. 1995)).
    12
    Contrary to Fola’s assertions, the text of 5.1.f of the
    permit    seems      straightforward         and    unambiguous.          The   provision
    prohibits     “discharges          covered    by”    the    permit    from      violating
    water quality standards.                  Of course, it is the permit holder
    that generates “discharges covered by” the permit.                              Thus, the
    provision controls the activities of the permit holder -- here
    Fola.     The state agency simply drafts the permit.                       That agency,
    WVDEP, has no control over the permit holder’s discharges.
    Further,     there    is     no   mention    in    5.1.f     of    “regulating,”
    “drafting a permit,” or “determining effluent limits,” all core
    activities      of   the     state    regulator.          Rather,    the    language   of
    5.1.f focuses on the discharges themselves.                         One would have to
    rewrite 5.1.f substantially to read it as imposing obligations
    on WVDEP. 3     As written, the plain language of 5.1.f indicates it
    applies    to     Fola,     the    permit     holder,      not   WVDEP,      the   agency
    granting the permit.
    Review of the provisions surrounding 5.1.f further supports
    this conclusion.           5.1.f is contained in a section of the permit
    3 For example, if 5.1.f imposed requirements on the state
    regulator rather than the permit holder, it would more naturally
    read: “The discharge or discharges covered by a WV/NPDES permit
    are to be of such quality regulated by the Department of
    Environmental Protection so as not to cause violation of
    applicable water quality standards adopted by the Department of
    Environmental Protection that agency, Title 47, Series 2.”
    Notably, these changes would require both insertions and
    deletions.
    13
    entitled     “Conditions         Applicable     to   All     Permits,”        and    in    a
    subsection       entitled    “Duty    to   Comply;        Penalties.”         The    first
    mandate of the subsection states, “The permittee must comply
    with all conditions of a WV/NPDES permit.”                       See W. Va. Code R.
    § 47-30-5.1.a (2009) (emphasis added).
    This subsection then lists several ways a permit holder can
    violate the permit separate and apart from violations of the
    permit’s effluent limits.             For example, under this subsection, a
    permit holder violates the permit when it “falsifies, tampers
    with, or knowingly renders inaccurate any monitoring device or
    method required to be maintained under a WV/NPDES permit.”                               
    Id. § 47-30-5.1.d.
              And a permit holder violates a permit when it
    “knowingly       makes      any    false      statement,         representation,          or
    certification       in    any     record   or   other      document      submitted        or
    required    to    be     maintained    under    this      permit.”        
    Id. § 47-30-
    5.1.e.
    It seems unlikely that immediately following these clear
    restrictions       on    permit    holders,     in   a    subsection      specifically
    addressed to permit holders, the drafters inserted in 5.1.f a
    directive    not    to    permit     holders,    but      only    to    the   regulating
    agency.       Indeed,       it    makes    little        sense    for    5.1.f      to    be
    incorporated into all coal mining permits, see 
    id. § 47-30-5,
    if
    5.1.f does not obligate the permit holder in any way.
    14
    Accordingly,   the   district   court’s   conclusion   that   5.1.f
    unambiguously regulates permit holders seems entirely warranted. 4
    B.
    Furthermore, rather than supporting Fola’s interpretation,
    all relevant extrinsic evidence points to the conclusion that
    5.1.f imposes obligations on the permit holder, not the state
    permitting agency.
    Fola’s argument to the contrary relies almost entirely on
    statements from WVDEP and the West Virginia Legislature.                Fola
    contends that these statements prove that neither body intended
    5.1.f to create an obligation on permit holders to meet water
    quality standards beyond the numerical effluent limits in the
    permit.     The Legislature’s 2013 and 2015 amendments and WVDEP’s
    statements certainly evince West Virginia’s present desire to
    cease    enforcement   of    water   quality   standards   against    permit
    holders.      But neither WVDEP’s current interpretation nor the
    Legislature’s actions in amending state law in 2013 and 2015
    constitute extrinsic evidence supporting Fola’s interpretation
    of its 2009 permit.
    4 Fola contends that the district court’s holding renders
    the effluent limits in the permit superfluous.   But by Fola’s
    own admission, the effluent limits do not delineate all the
    discharges disclosed to the regulating agency.  5.1.f captures
    those discharges, not explicitly regulated by effluent limits,
    which nonetheless decrease water quality and harm the aquatic
    ecosystem.
    15
    And Fola is simply wrong in contending that “[t]here is no
    evidence    that    West     Virginia       ever       intended”     to        hold     permit
    holders liable for violations of water quality standards.                                  Br.
    of Appellant at 34 (emphasis added).                   In fact, Fola has provided
    no evidence that the Legislature or WVDEP lacked this intent
    when Fola’s renewal permit was issued in 2009.                                 Rather, the
    record evidence indicates this was precisely what was intended.
    In 2011, two years after the issuance of Fola’s current
    permit,    WVDEP    pursued       an     enforcement        action    against           Fola’s
    parent company based on violations of the exact water quality
    standards at issue here as incorporated into the NPDES permit
    through    5.1.f.      See      Complaint    in    Intervention           at    12,     United
    States v. Consol Energy, Inc., No. 1:11-cv-0028 (N.D. W. Va.
    Mar. 14, 2011), ECF No. 6-1.                And Fola’s parent company agreed
    to    injunctive    relief       to    remedy     these     violations.                Consent
    Decree, Consol Energy, No. 1:11-cv-0028 (N.D. W. Va. Jun. 15,
    2011),     ECF   No.     3-1.          Moreover,       as   late     as        2015,     WVDEP
    interpreted      5.1.f     to    require        coal    companies         holding        NPDES
    permits to meet water quality standards.                    See WVDEP, Response to
    Comments, at 1.        This was the very reason why WVDEP attempted to
    amend 5.1.f.     See 
    id. Fola nonetheless
    insists that 5.1.f cannot subject it to
    any    substantive        obligations        because,         during           the      formal
    rulemaking in which 5.1.f was added to West Virginia’s NPDES
    16
    program,    EPA      stated   that    the    new       rules    would     not    alter    any
    “substantive         rights    or     obligations.”               Revision        of     West
    Virginia’s NPDES Program Transferring Authority over Coal Mines
    and Coal Preparation Plants from the West Virginia Department of
    Natural Resources; Division of Water Resources to Its Division
    of Reclamation, 50 Fed. Reg. 2996, 2997 (Jan. 23, 1985).                                 That
    argument      both     misreads      the     history       of     5.1.f     and    ignores
    important record evidence.
    5.1.f’s        prohibition       against          violating        water     quality
    standards     originated      in     pre-1984       West       Virginia    surface       coal
    mining     regulations.              See    West        Virginia        Surface        Mining
    Reclamation       Regulations,       ch.    20-6,       ser.     VII,    § 6B.04       (1983)
    (“Effluent Limitations - Discharge from the permit area shall
    not violate effluent limitations or cause a violation of water
    quality standards.”).             At that time, the surface coal mining
    regulations clearly recognized that permit holders were subject
    to enforcement actions for violating both effluent limitations
    and   water    quality    standards.             
    Id. In 1984,
       West    Virginia
    consolidated its surface coal mining regulations with its water
    pollution     regulations.           See    Preamble       to    Proposed       Regulations
    Consolidating the Article 5A and Article 6 Program (filed Nov.
    9, 1984).       As a result of this consolidation, the regulations
    governing     NPDES     permits      for     coal      mines     thereafter       included
    17
    provisions like 5.1.f that were previously found in the surface
    mining regulations.            See WVDEP, Response to Comments, at 1.
    The origin of 5.1.f renders untenable Fola’s reliance on
    EPA’s determination that the consolidated new regulations did
    not alter “substantive rights or obligations.”                           EPA was correct.
    The    new    regulations          did    not   alter       any   obligations       under   a
    permit; they simply brought existing obligations on surface coal
    mines    into    a    single       regulatory        scheme.      Surface    coal     mining
    facilities       were     already         subject      to    substantively         identical
    obligations       prior       to    the    consolidation          of   the   regulations.
    Thus,    EPA    had     no     reason     to    conclude       that    the   consolidated
    regulations altered any “substantive rights or obligations.”
    Moreover, although ignored by Fola, EPA’s view as to the
    reach of 5.1.f has been consistent, as has the acceptance by
    courts of EPA’s view when interpreting similar water quality
    provisions.          In contrast to WVDEP’s recent change of heart, EPA
    has     remained       clear       through      the    years      that    5.1.f      imposes
    obligations on permit holders.                       Before us, EPA has filed an
    authoritative amicus brief pointing this out and reiterating its
    position.       As EPA notes in its brief, some of the NPDES permits
    that    EPA     itself       has    issued      impose      narrative      water    quality
    18
    standards       like      those    in   Fola’s         permit. 5       That    water     quality
    standards        have      been    enforced            against     NPDES      permit     holders
    demonstrates the error in Fola’s contention that 5.1.f cannot
    reasonably           be   interpreted        to        impose    obligations       on     permit
    holders like Fola.
    In sum, both the plain language of the provision and the
    extraneous evidence support the district court’s holding that
    5.1.f        constitutes,         as    it    has        for     decades,      a   regulation
    enforceable           against      NPDES      permit        holders,       not     the    state
    permitting agency.
    C.
    Finally, Fola argues that our holding in Piney Run somehow
    prohibits this conclusion.                   According to Fola, Piney Run held
    that        permit    holders      “who      disclose          their   pollutants        to   the
    permitting agency and thereafter comply with the effluent limits
    5
    See, e.g., EPA NPDES Permit No. NH0100099 for the Town of
    Hanover, New Hampshire, pt. I.A.2, .3 and .6, https://www3.epa
    .gov/region1/npdes/permits/2015/finalnh0100099permit.pdf;       EPA
    2015 Multi-Sector General Permit for Stormwater Discharges
    Associated   with  Industrial   Activity,   pt.   2.2.1,   https://
    www.epa.gov/sites/production/files/2015-10/documents/msgp2015
    _finalpermit.pdf.   Moreover, courts have enforced water quality
    standards   provisions   when,   as   here,   the    NPDES   permit
    incorporates these standards.       See, e.g., Nat. Res. Def.
    Council, Inc. v. Cty. of Los Angeles, 
    725 F.3d 1194
    , 1199, 1205
    (9th Cir. 2013); Nw. Envtl. Advocates v. City of Portland, 
    56 F.3d 979
    , 985–90 (9th Cir. 1995); Nat. Res. Def. Council v.
    Metro. Water Reclamation Dist. of Greater Chicago, 
    175 F. Supp. 3d
    1041, 1049–54 (N.D. Ill. 2016).    In support of its contrary
    view, Fola relies on inapposite, unpublished, and overruled
    cases.
    19
    in their NPDES permits are shielded from liability” under the
    Clean Water Act.              Br. of Appellant at 43.               Therefore, Fola
    contends, since it “disclosed the presence of conductivity in
    its     discharges      and    has   complied         with    the   effluent   limits
    established by . . . WVDEP,” it too is shielded from liability
    under     the   Act,    even    if   it    violated        provision   5.1.f   of   its
    permit.     
    Id. There are
    multiple problems with this contention.
    First, and most fundamentally, Fola misstates our holding
    in Piney Run.           We expressly held that a permit shields “its
    holder from liability . . . as long as . . . the permit holder
    complies with the express terms of the permit and with the Clean
    Water Act’s disclosure requirements.”                      Piney 
    Run, 268 F.3d at 259
    (emphasis added). 6          Fola ignores the emphasized language and
    wishes     away   its    violation        of    one   of    “express   terms   of   the
    permit” -- provision 5.1.f.                    Piney Run offers no support for
    this approach.
    Fola attempts to bolster its misunderstanding of Piney Run
    by misinterpreting the careful examination of the history of the
    Clean Water Act we set forth in that case.                      See 
    id. at 264-66.
    We recognized that requirements that permit holders meet water
    6Of course, to obtain the benefits of the permit shield a
    permit holder must also not discharge a pollutant in excess of
    the effluent limitations for that pollutant as listed in the
    permit. Piney 
    Run, 268 F.3d at 259
    . That requirement is not at
    issue here.
    20
    quality      standards       had     been       the   “primary      means      of    federal
    regulation” prior to the 1972 enactment of the Clean Water Act.
    
    Id. at 264.
            The Act provided regulators with another tool --
    “direct limitations on the discharge of pollutants” in the form
    of numerical caps on those discharges -- and a means to regulate
    -- NPDES permits.            
    Id. at 265
    (quoting Friends of the Earth,
    Inc. v. Gaston Copper Recycling Corp., 
    204 F.3d 149
    , 151 (4th
    Cir. 2000)(en banc)).
    In Piney Run, we explained that adherence to its permit
    shielded a permit holder from liability under the Act.                              
    Id. But contrary
        to    Fola’s       apparent        belief,     we    did    not     hold      that
    numerical         limitations         on        specific        pollutant        discharges
    constituted       the    only      proper    subject       of    regulation      under     the
    Clean Water Act.         Rather, we noted that, despite the Clean Water
    Act’s “shift in focus of environmental regulation towards the
    discharge of pollutants, water quality standards still have an
    important role in the [Clean Water Act’s] regulatory scheme.”
    
    Id. (emphasis added).
    Compounding its error, Fola refuses to recognize that Piney
    Run involved very different issues than those presented here.
    In   Piney    Run,      we   did    not     consider      the    enforceability           of   a
    permit’s     requirement        that      the    permit     holder      adhere      to    water
    quality standards, let alone the enforceability of the specific
    narrative water quality standards required by West Virginia’s
    21
    NPDES permit.            Piney Run involved the enforcement of numerical
    limitations         on    the    discharge        of    pollutants       under       a        very
    different Maryland NPDES permit. 7                 In that context, we concluded
    that       the   holder    of   a   Maryland      NPDES       permit    who     “discharges
    pollutants that are not listed in its permit” was nonetheless
    shielded         from    liability     under      the    Clean        Water    Act       if     it
    “adequately         disclosed”       those     discharges        “to     the     permitting
    authority.”        
    Id. at 268.
    But this conclusion in Piney Run does not allow an NPDES
    permit holder in West Virginia to ignore 5.1.f’s requirement
    “not to cause violation of applicable water quality standards.”
    Indeed, although Piney Run involved a permit that regulated only
    numerical         effluent      limitations,       rather       than     also     directing
    adherence to water quality standards like the permit at issue
    here,      we    iterated    and    reiterated         that    only    “follow[ing]           the
    terms of their NPDES permits” allows permit holders to avoid
    liability.         
    Id. at 265
    ; see also 
    id. at 259
    (explaining that to
    be shielded from liability under the Clean Water Act, a permit
    holder must comply “with the express terms of [its] permit”).
    Piney Run provides Fola no way to avoid liability if Fola has
    7Maryland’s NPDES permits do not contain a provision
    similar to 5.1.f. Rather, unlike in West Virginia, the Maryland
    permitting agency simply will not issue a permit unless it
    “finds that the discharge meets . . . applicable State and
    federal water quality standards.”   Md. Code Ann., Envir. § 9-
    324(a)(1) (West 2016).
    22
    not complied “with the express terms of its permit,” including
    provision 5.1.f.
    Nothing in Piney Run forbids a state from incorporating
    water quality standards into the terms of its NPDES permits.
    Rather, Piney Run held, as we do today, that a permit holder
    must comply with all the terms of its permit to be shielded from
    liability.     The terms of Fola’s permit required it to comply
    with water quality standards.        If Fola did not do so, it may not
    invoke the permit shield.
    III.
    Having    rejected    Fola’s    principal    contention    that   5.1.f
    imposes   no   obligations   on     it,   we   turn   to   Fola’s   remaining
    argument -- that the district court erred in finding that Fola
    violated 5.1.f.
    A.
    Through 5.1.f., Fola’s permit incorporates narrative water
    quality standards prohibiting discharges into Stillhouse Branch
    that are “harmful” or have a “significant adverse impact” on
    aquatic ecosystems. 8     In a long, remarkably thorough opinion, the
    8 These standards provide in relevant part:
    3.2 No sewage, industrial wastes or other wastes
    present in any of the waters of the state shall cause
    therein or materially contribute to any of the
    following conditions . . .
    (Continued)
    23
    district court explained its reasons for concluding that Fola’s
    discharges into Stillhouse Branch violated these narrative water
    quality standards in Fola’s permit.                  The court relied on the
    testimony,    reports,          charts,    studies,        and     exhibits     from
    experienced scientists who had published extensively in peer-
    reviewed journals.        All of the experts supported the Coalition’s
    contention    that    Fola      violated       the   permit’s     narrative    water
    quality standards. 9
    In   doing     so,   the    experts   used      the   West   Virginia    Stream
    Condition    Index        to    determine        whether     Fola’s    discharges
    biologically compromised Stillhouse Branch.                  Both EPA and WVDEP
    have long used the Index to measure water quality.                            When a
    . . .
    3.2.e. Materials in concentrations which are
    harmful, hazardous or toxic to man, animal or
    aquatic life;
    . . .
    3.2.i.   Any   other   condition,   including
    radiological exposure, which adversely alters the
    integrity of the waters of the State including
    wetlands; no significant adverse impact to the
    chemical, physical, hydrologic, or biological
    components    of   aquatic  ecosystems   shall   be
    allowed.
    W. Va. Code R. § 47-2-3 (2016).
    9 Fola offered a witness whom the district court found
    “h[eld] no training in the study of ecology” and, prior to being
    retained by Fola as an expert in this litigation, “had never
    analyzed the type of ecological data” at issue here.     
    Fola, 82 F. Supp. 3d at 681
    . On appeal, Fola does not suggest that the
    district court should have credited this witness’s testimony.
    24
    stream’s Index score falls below 68, EPA considers the stream
    impaired     under   33   U.S.C.    §     1313(d).        See    infra      n.11.      The
    experts      explained     that     the    release        of    ions      from      Fola’s
    discharges     caused     the     conductivity       in    Stillhouse        Branch     to
    increase and sensitive insect species to die, thereby causing
    the stream’s Index score to fall well below 68.                           Fola, 82 F.
    Supp. 3d at 696.           On the basis of the expert evidence, the
    district court found that Fola’s discharges caused or materially
    contributed to the impairment of Stillhouse Branch by increasing
    the conductivity of the stream.
    On appeal, Fola makes no contention that the district court
    erred   in    finding     that    Fola’s    discharges          in   fact    caused     or
    materially      contributed        to     the    biological          impairment         in
    Stillhouse Branch.        And Fola does not argue that narrative water
    quality standards cannot be enforced; it could not do so given
    that the Supreme Court has held to the contrary.                       See PUD No. 1
    of Jefferson Cty. v. Wash. Dep’t of Ecology, 
    511 U.S. 700
    , 716
    (1994) (explaining that the Clean Water Act “permits enforcement
    of broad, narrative criteria” and “only one class of criteria,
    those   governing    ‘toxic       pollutants    listed         pursuant     to   section
    1317(a)(1),’ need be rendered in numerical form”).
    Instead, Fola offers brief and largely derivative “process”
    arguments.      A substantial portion of those arguments involve
    Fola’s mischaracterization of the district court’s careful and
    25
    detailed     fact-finding.            Fola      attempts      to       treat     that    fact-
    finding,     which        of   course     can     only   be       reversed       if    clearly
    erroneous, as “rulemaking” subject to de novo review.
    B.
    First, Fola maintains that it was deprived of “fair notice”
    that water quality standards were enforceable provisions of its
    permit.      This assertion rests on Fola’s own misinterpretation of
    the    language      in    its    2009    permit     and      a    studied       refusal    to
    acknowledge        that    language’s      history,      all      of    which     we    detail
    above.      Suffice it to say again that, when the Coalition filed
    this lawsuit in March 2013, Fola had been bound by the 2009
    permit at issue here for four years.                       Moreover, in 2011, two
    years prior to the commencement of this action, WVDEP brought
    suit   to    enforce       the    water    quality       standards        at     issue    here
    against Fola’s parent company.                  And, prior to initiation of this
    case, Fola’s parent company had in fact agreed to take measures
    to remedy its violations of those water quality standards.                                Fola
    thus   had    ample,       personalized         notice    that      the    water       quality
    standards in a West Virginia NPDES permit were enforceable, and
    would be enforced, against a permit holder.
    Fola next contends that it relied on guidance from WVDEP
    that the State would not pursue any enforcement action based on
    conductivity or water quality standards.                      But again as explained
    above,      Fola    offers       no   evidence      that      WVDEP       made    any     such
    26
    assurance     in    2009    when       WVDEP          last        renewed       Fola’s      permit.
    Moreover,    such    contemporaneous              assurances            seem     unlikely     given
    WVDEP’s decision in 2011 to bring an enforcement action based on
    these very water quality standards.                          Further, even if Fola had
    offered evidence that WVDEP made such assurances when it issued
    Fola’s renewal       permit      in     2009,         that     would      not     foreclose     the
    Coalition from bringing this lawsuit.                          For Congress enacted the
    citizen     suit    provision         of     the       Clean       Water       Act    to    address
    situations,     like      the    one       at    hand,       in    which       the    traditional
    enforcement agency declines to act.                         See Gwaltney of Smithfield,
    Ltd. v. Chesapeake Bay Found., Inc., 
    484 U.S. 49
    , 53, 60 (1987).
    An   agency’s       informal         assurance          that        it     will       not    pursue
    enforcement cannot preclude a citizen’s suit to do so.                                       See 33
    U.S.C. § 1365(b)(1)(B).
    Finally, Fola argues that the district court engaged in
    unlawful     rulemaking.             That        argument          is     similarly         unsound.
    Hornbook     law    defines       “a       rule”       as     “a        generally      applicable
    principle    or     standard      developed            by    some        authority       including
    administrative authorities.”                    1 Admin. L. & Prac. § 1:20 (3d ed.
    2016).       The    district         court       did     not       create       any    “generally
    applicable    principle         or     standard.”              The       court       made   factual
    findings    based    on    the       evidence         presented          in    this    particular
    case.     The only rules for which the court found Fola liable are
    contained in its permit, specifically §§ 47-30.5.1.f and 47-2-
    27
    3.2.e and -3.2.i.           These rules have long been incorporated into
    Fola’s permit, and EPA has never approved their removal.                                       They
    remain unchanged and controlling.
    We must reject Fola’s attempts to transform the district
    court’s detailed fact-finding into rulemaking.                              After carefully
    assessing the record before it, the district court found as a
    fact   that    that    a     failing      Index        score    indicated          an   impaired
    stream and that Fola’s mining caused the increased conductivity
    that   resulted       in    that    impairment.            These      findings          are    well
    supported by the record evidence.                     None are clearly erroneous.
    Some even rest on undisputed facts.                        For example, EPA has
    identified, and Fola does not dispute, “mining” as the source of
    the impairment of Stillhouse Branch.                      See WVDEP, 2012 Final West
    Virginia      Integrated         Water    Quality        Monitoring         and     Assessment
    Report List Page 14 (reviewing the 2012 Clean Water Act Section
    303(d) Impaired Waters List).                       Moreover, Fola stipulated that
    its    mine   is    the     only       mine    that     discharges          into    Stillhouse
    Branch.       And   WVDEP        itself       has    explained,       and    Fola       does    not
    disagree,      that        the    Index        “was     specifically          designed          for
    assessment     of     the    biological             component    of    the     47       C.S.R.    2
    § 3.2.i    narrative        criteria”         as     applicable       to    waters       such    as
    Stillhouse     Branch.           WVDEP,       Justification        and       Background         for
    Permitting      Guidance         for     Surface        Coal    Mining       Operations          to
    Protect West Virginia’s Narrative Water Quality Standards, 47
    28
    C.S.R.         2     §§       3.2.e      and       3.2.i,      at       4      (2010),
    http://www.dep.wv.gov/pio/Documents/Narrative/Narrative Standard
    s Guidance Justification.pdf.
    Despite this historic consensus, Fola argues that WVDEP has
    recently      rejected    the    Index    as   a   sole     determinant      of   water
    quality, and that the court has therefore “usurped” the agency’s
    role    in    its   use   of    the   Index.       This     argument    rests     on    a
    mischaracterization of the district court’s use of the Index.
    The court did not enshrine the Index as the sole acceptable
    method of establishing violations of water quality standards.
    Rather, the court explained that it only relied on the Index
    “[i]n        the    absence     of     [WVDEP]      advancing       a       meaningful
    methodological alternative.”              
    Fola, 82 F. Supp. 3d at 679
    .                 On
    appeal, neither Fola nor WVDEP points to any “methodological
    alternative” to the Index.               In the absence of any alternative,
    the district court simply applied the methodology both WVDEP and
    EPA have applied for years.
    The district court found that, until 2012, EPA and WVDEP
    had generally agreed to use an Index score of 68 to determine
    whether water quality standards were being met.                         If a stream
    scored below 68, the stream was to be listed as impaired.                          
    Id. 29 at
    677. 10      The record offers abundant support for this finding.
    See,        e.g.,    Letter     from     Shawn       M.   Garvin,     EPA    Regional
    Administrator,         to      Randy      C.       Huffman,    Secretary,       WVDEP
    [hereinafter Garvin Letter], Enclosure 1, at 16 (Mar. 25, 2013)
    (“When       determining      whether    to    add   waters   to    West    Virginia’s
    Section 303(d) list, EPA used West Virginia’s narrative water
    quality criteria (W. Va. CSR §§ 47-2-3.2(e) & (i)) as applied to
    the       aquatic    life     uses,     and    WVDEP’s    bioassessment       listing
    methodology for its 2010 Section 303(d) list (i.e., [the Index])
    . . . .”); see also WVDEP, 2010 West Virginia Integrated Water
    Quality Monitoring and Assessment Report 14 (2010) (explaining
    the direct relationship between § 47-2-3.2.i, Index scores, and
    impaired water listing).
    Indeed, Fola concedes that EPA and WVDEP have long used the
    Index.        Neither agency -- nor anyone else before this case --
    suggested that this use required promulgation of a formal rule.
    Rather, the Index has been used, as the district court used it,
    as    a     method   for    assessing     compliance       with     narrative    water
    10
    Prior to 2012 when it ceased using the Index to determine
    impairment, WVDEP had attempted to include a “gray-zone” listing
    between 60.6 and 68.0.        EPA rejected this approach as
    “unsupportable,” and continues to use 68 as the threshold. See
    Garvin Letter, Enclosure 1, at 12 n.3.    For our purposes, this
    dispute is immaterial because the district court found that
    Stillhouse Branch had an Index score ranging from 31.60 to
    58.17.   
    Fola, 82 F. Supp. 3d at 696
    .   Fola does not challenge
    these findings.
    30
    quality standards.           Far from creating a rule for determining
    violations of water quality standards, the court simply made a
    factual    determination      using     the       Index     as    a    well-established
    methodology.         Employing   this       methodology,         the    district       court
    came to the same conclusion as EPA had -- Stillhouse Branch was
    impaired. 11
    Similarly,       contrary    to    Fola’s          assertions,          the    district
    court’s    determinations        as    to        conductivity         also     constituted
    findings of fact, not rulemaking.                      The court heard extensive
    expert testimony on the causal relationship between increased
    conductivity in Appalachian streams and impairment as evidenced
    by declining Index scores.            
    Fola, 82 F. Supp. 3d at 679
    -86.                     The
    court     credited     the    testimony          of    accepted       experts       and   an
    authoritative       EPA   publication.                All   concluded        that     mining
    activities cause increases in conductivity, which in turn cause
    impairment.    
    Id. at 686–96.
    The    court     noted    that    peer-reviewed             scientific         articles
    first recognized the relationship of mining, conductivity, and
    11While Fola focuses on notice as it relates to procedure,
    it is worth mention that Fola also had notice of the court’s
    factual determination that Stillhouse Branch was impaired.
    WVDEP (with EPA approval) has listed Stillhouse Branch on its
    impaired waters list based on biological impairment since 2006.
    See WVDEP, 2006 Integrated Water Quality Monitoring and
    Assessment Report List Page 15 (2006); 
    id. at 20
    (explaining
    that WVDEP assessed biological impairment using the Index).
    31
    decreased Index scores in 2008, a year before issuance of Fola’s
    renewal permit.       See 
    id. at 690
    (citing Pond et 
    al., supra
    n.1).
    Other articles strengthened these findings.                
    Id. (citing, among
    others, M.A. Palmer et al., Mountaintop Mining Consequences, 327
    Sci. 148 (2010) (finding that as conductivity increased, Index
    scores decreased)).          In rebuttal, Fola offered an expert whom
    the district court found unqualified -- an assessment Fola does
    not challenge on appeal.
    Finally, the relief the district court ordered belies any
    suggestion that it engaged in rulemaking.                  The court had the
    “discretion to determine” appropriate relief.                  See Friends of
    the Earth, Inc. v. Laidlaw Envtl. Servs. (TOC), Inc., 
    528 U.S. 167
    , 192 (2000).         In exercising that discretion, the district
    court    refused   to    order   Fola    to    implement   the    solution    the
    Coalition proposed, a reverse osmosis system.                 The court deemed
    this    solution      “too   expensive       and   too   uncertain.”         Order
    Specifying Relief at 5, Fola, No. 2:13-cv-5006 (S.D. W. Va. Dec.
    8, 2015), ECF No. 183.           Instead, the court appointed a special
    master to oversee implementation of Fola’s proposed solution,
    which focused on water management practices that respond to the
    unique characteristics of Stillhouse Branch.                
    Id. at 6–7.
           The
    court did not require Fola to achieve any particular Index score
    or     conductivity     level,    but    simply     ordered      Fola   to   take
    appropriate measures either to reduce the conductivity in its
    32
    discharges or to increase the Index score of Stillhouse Branch.
    
    Id. at 1.
      The relief ordered by the district court reflects its
    careful fact-based findings, not unprincipled rulemaking.
    In sum, Fola’s arguments as to why the district court erred
    in finding that Fola violated its permit, like Fola’s arguments
    as to the permit’s reach, uniformly fail.
    IV.
    Accordingly, for the reasons set forth above, the judgment
    of the district court is
    AFFIRMED.
    33