Env Texas Citizen Lobby, Inc. v. ExxonMobil , 824 F.3d 507 ( 2016 )


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  •      Case: 15-20030    Document: 00513525463     Page: 1   Date Filed: 05/27/2016
    IN THE UNITED STATES COURT OF APPEALS
    FOR THE FIFTH CIRCUIT    United States Court of Appeals
    Fifth Circuit
    FILED
    May 27, 2016
    No. 15-20030
    Lyle W. Cayce
    Clerk
    ENVIRONMENT TEXAS CITIZEN LOBBY, INCORPORATED; SIERRA
    CLUB,
    Plaintiffs - Appellants
    v.
    EXXONMOBIL CORPORATION; EXXONMOBIL CHEMICAL COMPANY;
    EXXONMOBIL REFINING & SUPPLY COMPANY,
    Defendants - Appellees
    Appeal from the United States District Court
    for the Southern District of Texas
    Before BENAVIDES, DENNIS, and SOUTHWICK, Circuit Judges.
    FORTUNATO P. BENAVIDES, Circuit Judge:
    This appeal concerns a Clean Air Act (“CAA”) citizen suit brought by
    Plaintiffs-Appellants Environment Texas Citizen Lobby Incorporated and
    Sierra Club (“Plaintiffs”) against ExxonMobil Corporation, ExxonMobil
    Chemical    Company,     and   ExxonMobil      Refining    &   Supply     Company
    (collectively, “Exxon”). Exxon owns and operates an industrial complex (which
    includes a refinery and two petrochemical plants) in Baytown, Texas, and
    Plaintiffs allege that Exxon violated the federal permits governing operations
    at the complex thousands of times over a nearly eight year period. Specifically,
    and as relevant to this appeal, Plaintiffs allege that Exxon (1) repeatedly
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    violated a permit condition “stating that emissions from ‘upset’ events are not
    authorized under any circumstances,” (2) repeatedly emitted pollutants at
    rates in excess of the hourly emission limits set forth in permit emission rate
    tables, (3) repeatedly emitted highly reactive volatile organic compounds
    (“HRVOCs”) at rates in excess of a 1,200 lbs./hr. emission limit, (4) repeatedly
    violated a prohibition on visible emissions from flares lasting more than five
    minutes during any two consecutive hours, and (5) repeatedly violated a
    number of other permit requirements, some emissions-related and some non-
    emissions-related, as reflected in “deviation reports” filed with the Texas
    Commission on Environmental Quality.
    Plaintiffs sued Exxon for these and other alleged violations in the United
    States District Court for the Southern District of Texas. The district court
    conducted a thirteen-day bench trial and issued findings of fact and conclusions
    of law denying most of Plaintiffs’ claims and declining to order any relief. On
    appeal, Plaintiffs contend generally that (1) the district court erred in finding
    a total of only 94 actionable violations of Exxon’s permits, and (2) the district
    court abused its discretion in declining to impose any penalties, issue a
    declaratory judgment, or grant injunctive relief in remediation of the violations
    at issue. We now VACATE the district court’s judgment and REMAND for
    further proceedings.
    I. BACKGROUND
    Exxon’s Baytown industrial complex—the subject of the instant
    lawsuit—is comprised of a refinery, an olefins plant, and a chemical plant.
    Overall, the complex is governed by five federal operating permits issued
    pursuant to Title V of the CAA. See 42 U.S.C. §§ 7661a–7661d. These federal
    permits (“Title V Permits”) incorporate various federal and state regulatory
    requirements and also incorporate by reference state permits issued pursuant
    to State Implementation Plan (“SIP”) programs. Each permit at issue in this
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    suit contains a Maximum Allowable Emission Rate Table (“MAERT”), which
    sets the maximum rates at which specific pollutants may be emitted from
    specific sources (or, in the case of “flexible” permits, groups of sources). It is
    also undisputed on appeal that (1) “[t]he permits for all three plants
    incorporate the Texas ‘HRVOC Rule,’ which limits facility-wide emissions of
    highly reactive volatile organic compounds to no more than 1,200 pounds per
    hour,” and (2) “[t]he permits for all three plants incorporate federal regulations
    prohibiting visible” plant flare emissions “for periods exceeding five minutes
    during any two-hour period.” Finally, each incorporated permit involved in this
    case contains a series of additional “special conditions.” For example, and as
    relevant to the present appeal, a permit governing operations at the Baytown
    refinery provides under special conditions 38 and 39 that “[t]his permit does
    not authorize upset emissions, emissions from maintenance activities that
    occur as a result of upsets, or any unscheduled/unplanned emissions associated
    with an upset. Upset emissions are not authorized, including situations where
    that upset is within the flexible permit emission cap or an individual emission
    limit.”
    The state regulatory agency charged with enforcing these permit
    provisions in conjunction with the EPA is the Texas Commission on
    Environmental Quality (“TCEQ”). In order to facilitate TCEQ oversight and
    enforcement, state regulations require regulated entities to document
    “noncompliance and indications of noncompliance” with their permits in
    certain ways. Env’t Tex. Citizen Lobby, Inc. v. ExxonMobil Corp., 
    66 F. Supp. 3d
    875, 882 (S.D. Tex. 2014). First, regulated entities must submit State of
    Texas Environmental Electronic Reporting System (“STEERS”) reports to the
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    TCEQ documenting “emissions events” 1 that result in the release of pollutants
    at or above a threshold quantity. See 30 TEX. ADMIN. CODE § 101.201(a); 
    id. § 101.1(88)–(89).
    Second, regulated entities must maintain on-site records of
    “emissions events” that result in the release of pollutants below the relevant
    threshold quantity. 
    Id. § 101.201(b).
    Third, regulated entities must submit
    semi-annual reports to the TCEQ documenting any “deviations” 2 from Title V
    permit requirements. 
    Id. § 122.145(2).
    The TCEQ investigates each
    “reportable” event reflected in a STEERS report, reviews the on-site records of
    all “recordable” events, and has the authority to take enforcement action on
    any event should it deem such action necessary. In the present case, the record
    reflects that the TCEQ pursued enforcement and ultimately assessed over $1
    million in penalties against Exxon based on a number of the “events” set out
    in its reports and records for the period relevant to this appeal. Furthermore,
    in 2012, the TCEQ and Exxon entered an “agreed enforcement order” which,
    among other things, requires Exxon to implement four “environmental
    improvement projects” in order to “reduce emissions at the Baytown Complex,
    including emissions from emissions events . . . .”
    As a supplement to the enforcement authority vested in the EPA and
    state regulatory agencies like the TCEQ, the CAA also authorizes “any person
    [to] commence a civil action on his own behalf” against “any person . . . who is
    1   An “emissions event” is defined under Texas law as “[a]ny upset event or
    unscheduled maintenance, startup, or shutdown activity, from a common cause that results
    in unauthorized emissions of air contaminants from one or more emissions points at a
    regulated entity.” 30 TEX. ADMIN. CODE § 101.1(28). “Unauthorized emissions” are in turn
    defined as “[e]missions of any air contaminant except water, nitrogen, ethane, noble gases,
    hydrogen, and oxygen that exceed any air emission limitation in a permit, rule, or order of
    the commission . . . .” 
    Id. § 101.1(108).
            2 A “deviation” is defined under Texas law as “[a]ny indication of noncompliance with
    a term or condition of the permit as found using compliance method data from monitoring,
    recordkeeping, reporting, or testing required by the permit and any other credible evidence
    or information.” 30 TEX. ADMIN. CODE § 122.10(6).
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    alleged to have violated (if there is evidence that the alleged violation has been
    repeated) or to be in violation of . . . an emission standard or limitation under
    [the CAA].” 42 U.S.C. § 7604(a)(1). The definition of “emission standard or
    limitation” includes any “standard,” “limitation,” “schedule,” “term,” or
    “condition” in a Title V permit. 
    Id. § 7604(f)(4).
    Thus, any person may bring a
    so-called “citizen suit” under the CAA against a regulated entity that has
    violated a provision of its Title V permit, so long as the violation has been
    “repeated” or is “ongoing.” See 
    id. § 7604(a)(1).
          In December of 2010, Plaintiffs in the present case sued Exxon under the
    CAA’s citizen suit provision, alleging thousands of violations of Exxon’s
    permits over a period spanning from October of 2005 through the date of suit. 3
    Plaintiffs raised seven counts in their complaint, five of which are at issue in
    this appeal. Specifically, Plaintiffs alleged (among other things) that Exxon
    (1) committed thousands of violations of the refinery permit condition
    providing that “upset emissions” are “not authorize[d]” (Count I); (2) committed
    thousands of violations of the MAERT emission limits for various pollutants in
    the complex’s permits (Count II); (3) committed 18 days of violations of the
    incorporated 1,200 pounds per hour permit limits on emissions of HRVOCs
    (Count III); (4) committed 44 days of violations of the incorporated permit
    prohibitions on visible emissions from flares for periods exceeding five minutes
    during any two-hour period (Count IV); and (5) committed over 4,000 days of
    additional violations of sundry regulatory requirements reflected in “deviation
    reports” that Exxon submitted to the TCEQ (Count VII). Plaintiffs sought the
    maximum statutory penalties for each of the violations, a declaratory judgment
    that Exxon violated its permits (and thus the CAA), a permanent injunction
    3  Because Plaintiffs claimed many of the violations were “ongoing,” the period of
    alleged violations ultimately extended through September of 2013.
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    barring Exxon from further permit violations, attorneys’ fees and costs, and
    appointment of a “special master” to monitor implementation of relief.
    As evidentiary support for the alleged violations, Plaintiffs relied
    exclusively on “Exxon’s STEERS reports of reportable emissions events,
    records of recordable emissions events, and Title V deviation reports covering
    the time period at issue.” Env’t Tex., 
    66 F. Supp. 3d
    at 882. At the direction of
    the district court, the parties compiled the various reports and records into
    spreadsheets and “stipulated to [their] contents.” 
    Id. The district
    court
    subsequently conducted a thirteen-day bench trial and issued findings of fact
    and conclusions of law in late 2014. Broadly, the district court concluded that
    only 94 of the thousands of alleged permit violations were “actionable,” and the
    court declined to order any of Plaintiffs’ requested relief. More specifically,
    (1) the district court treated Count I as alleging violations of MAERT hourly
    emission limits (essentially conflating Count I and Count II) and found no
    “actionable” Count I violations; (2) the district court found only 25 “actionable”
    Count II violations based on Plaintiffs’ ostensible failure to show that most of
    the violations were repeated violations of the same hourly MAERT limits;
    (3) the district court found only a handful of Count III and Count IV violations,
    as the rest of the alleged violations were not “corroborated”; (4) the district
    court found no additional Count VII violations, as Plaintiffs had failed to meet
    their burden of showing that the “indications” of noncompliance in the
    deviation reports were actual violations; (5) the district court declined to grant
    declaratory relief, because the court had “already made” findings on Exxon’s
    liability; (6) the district court declined to impose a penalty based, in part, on
    the finding that Exxon received no economic benefit from its failure to comply
    with its permits and the view that lengthy/serious violations could be offset by
    less lengthy/less serious violations; and (7) the district court declined to grant
    injunctive relief, finding that the injury to the public from denial of an
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    injunction would not outweigh the damage the injunction would cause Exxon.
    Plaintiffs now appeal.
    II. DISCUSSION
    As noted above, the district court in this case found that 94 of the
    thousands of alleged permit violations were “actionable” under the citizen suit
    provision of the CAA, and the court declined to order any of Plaintiffs’
    requested relief. Notably, the district court’s judgment on penalties went
    beyond merely concluding that no penalty was warranted for the violations it
    found actionable. Rather, the district court determined that even if every
    alleged violation were actionable, it would not impose a penalty. Env’t Tex., 
    66 F. Supp. 3d
    at 904. We conclude that (1) the district court erred in finding 94
    “actionable” permit violations; (2) the district court abused its discretion when
    it weighed less lengthy/less serious violations against more lengthy/more
    serious violations in its assessment of the CAA penalty factors; and (3) the
    district court erred in failing to consider certain evidence of Exxon’s economic
    benefit from noncompliance. We therefore VACATE the district court’s
    judgment and REMAND for assessment of penalties based on the correct
    number of actionable violations.
    A. Liability
    The liability claims at issue in this appeal largely hinge on the legal
    significance of undisputed facts. As noted above, the parties stipulated to the
    accuracy of Plaintiffs’ evidence, which consisted of spreadsheets detailing
    Exxon’s reports and records of “emissions events” and Title V “deviation
    reports.” However, the parties dispute nearly every legal conclusion to be
    drawn from the spreadsheets, including whether the spreadsheets—because
    they reflect Exxon’s legally required reports and records of “emissions
    events”—constitute admissions of permit violations. We will address each
    liability count in turn after briefly discussing the standard of review.
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    1. Standard of Review
    “The standard of review for a bench trial is well established: findings of
    fact are reviewed for clear error and legal issues are reviewed de novo.” Preston
    Exploration Co., L.P. v. GSF, L.L.C., 
    669 F.3d 518
    , 522 (5th Cir. 2012) (quoting
    Kona Tech. Corp. v. S. Pac. Transp. Co., 
    225 F.3d 595
    , 601 (5th Cir. 2000)).
    However, “[t]he clearly erroneous standard of review does not apply to [those]
    factual findings made under an erroneous view of controlling legal principles.”
    Maritrend, Inc. v. Serac & Co. (Shipping) Ltd., 
    348 F.3d 469
    , 470 (5th Cir.
    2003) (quoting Lake Charles Stevedores, Inc. v. PROFESSOR VLADIMIR
    POPOV M/V, 
    199 F.3d 220
    , 223 (5th Cir. 1999)).
    “A finding is ‘clearly erroneous’ when there is no evidence to support it,
    or if the reviewing court, after assessing all of the evidence, is left with the
    definite and firm conviction that a mistake has been committed.” U.S. Bank
    Nat’l Ass’n v. Verizon Commc’ns, Inc., 
    761 F.3d 409
    , 431 (5th Cir. 2014)
    (quoting Baldwin v. Taishan Gypsum Co., Ltd. (In re Chinese-Manufactured
    Drywall Prods. Liab. Litig.), 
    742 F.3d 576
    , 584 (5th Cir. 2014)). When “the
    district court’s account of the evidence is plausible in light of the record viewed
    in its entirety,” this court “may not reverse it even though convinced that had
    it been sitting as the trier of fact, it would have weighed the evidence
    differently.” 
    Id. (quoting Anderson
    v. City of Bessemer City, 
    470 U.S. 564
    , 573–
    74 (1985)). Furthermore, if this court “determine[s] that ‘there are two
    permissible views of the evidence,’ then [it] may not conclude that the [district]
    court’s choice between them was clearly erroneous.” 
    Id. 2. Count
    I: The “No Upset Emissions” Condition
    In Count I of their complaint, Plaintiffs alleged that Exxon violated
    incorporated provisions of the Title V Baytown refinery permit providing “that
    upset emissions, emissions from maintenance activities that occur as a result
    of upsets, or any unscheduled/unplanned emissions associated with an upset,
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    are not authorized in any amount.” Likewise, in the proposed findings of fact
    and conclusions of law that Plaintiffs submitted to the district court, they
    alleged under Count I that “Exxon violated the provisions of the Refinery’s
    Title V permit that prohibit upset emissions,” and Plaintiffs specifically cited
    special conditions 38 and 39 of incorporated refinery permit 18287 in support
    of this allegation. However, Plaintiffs also submitted a summary exhibit of
    Count I violations in which violations of “MAERT limits” were referenced. For
    this reason, the district court concluded that Plaintiffs’ allegations with respect
    to Count I had been “inconsistent,” and because the Count I summary chart
    listed violations “contaminant-by-contaminant,” the district court treated
    Count I as alleging violations “of conditions that apply to separate air
    contaminants,” i.e., MAERT emission limits. Env’t Tex., 
    66 F. Supp. 3d
    at 895–
    96. In other words, the district court conflated Plaintiffs’ Count I allegations
    with their Count II allegations (addressed infra) and concluded there were no
    actionable violations under Count I for the same reason there were very few
    actionable violations under Count II. On appeal, Plaintiffs argue that the
    district court simply applied the wrong permit provisions to Count I; put
    another way, Plaintiffs claim that the court erred by applying the wrong law
    to the events set forth in Plaintiffs’ spreadsheets—a decision to which de novo
    review applies. See 
    Maritrend, 348 F.3d at 470
    . We agree.
    The aforementioned special conditions 38 and 39 state that “[t]his permit
    does not authorize upset emissions, emissions from maintenance activities that
    occur as a result of upsets, or any unscheduled/unplanned emissions associated
    with an upset. Upset emissions are not authorized, including situations where
    that upset is within the flexible permit emission cap or an individual emission
    limit.” An “upset event” (the emissions from which would be “upset emissions”)
    is defined under Texas law as an “unplanned and unavoidable breakdown or
    excursion of a process or operation that results in unauthorized emissions.” 30
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    TEX. ADMIN. CODE § 101.1(110). Thus, because every “emissions event”
    recorded or reported by Exxon in this case also by definition involved
    “unauthorized emissions” as a result of “upset event[s]” or “unscheduled
    maintenance, startup, or shutdown activity,” 
    id. § 101.1(28),
    Plaintiffs were
    clearly alleging under Count I that every emission of a pollutant during each
    recorded “emissions event” at the refinery was a violation of special conditions
    38 and 39 (and, by extension, one of Exxon’s Title V permits).
    The district court, however, believed it was “unclear exactly which
    standards or limitations Plaintiffs contend were violated under Count I,”
    largely because one of Plaintiffs’ summary exhibits setting forth Count I
    violations listed the violations under a heading for violations of “MAERT
    limits” rather than special conditions 38 and 39. 4 Env’t Tex., 
    66 F. Supp. 3d
    at
    896. The court thus suggested in a footnote that Plaintiffs were “combining a
    condition incorporated into a flexible permit that does not authorize upset
    emissions with conditions incorporated into the same flexible permit that limit
    separate air contaminants,” and because Plaintiffs’ Count I allegations were
    listed “contaminant-by-contaminant,” the court treated Count I as alleging
    solely violations of MAERT limits. 
    Id. at 896
    & n.163.
    On appeal, Exxon claims that the district court’s Count I analysis
    stemmed from its “reject[ion]” of “Plaintiffs’ theory that all upset emissions are
    actionable violations” and its “recogni[tion] that these emissions were
    actionable, if at all, only if they exceeded the maximum hourly emission rates.”
    But this contention is inaccurate—the district court in fact expressly declined
    to “address whether the sole fact that there are allegedly multiple upset events
    4  While Plaintiffs do not offer an explanation for this variance, a simple review of the
    record provides an obvious one: human error. The summary tables for Plaintiffs’ Count II
    violations are identical to the summary tables for the Count I violations, with only the
    numbers and headings changed. Thus, when the Count II tables were used to make the Count
    I tables, it is likely that the “violations” heading was mistakenly left unaltered.
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    makes those upset events actionable under the CAA or whether the condition
    referencing upset emissions constitutes a standard or limitation under the
    CAA.” 
    Id. at 896
    . Indeed, in the district court’s view, Plaintiffs did “not contend
    every upset event is actionable because the condition that does not authorize
    upset emissions was repeatedly violated.” 
    Id. As should
    be clear from the
    foregoing discussion, however, this is precisely what Plaintiffs contended, and
    we do not think the district court’s decision to ignore special conditions 38 and
    39 follows from “Plaintiffs’ approach to proving repeated violations under
    Count I contaminant-by-contaminant.” 
    Id. at 896
    n.167. Rather, because
    Plaintiffs alleged that each emission of each pollutant during refinery
    emissions events was a violation of the special conditions (regardless of
    MAERT limits), it is unsurprising under Plaintiffs’ actual Count I theory that
    they would list violations in such a manner.
    Nevertheless, Exxon further argues that Plaintiffs’ allegations of permit
    violations in general are based on the fallacious theory that “unauthorized
    emissions” during emissions events violate state permits. Exxon claims, on the
    contrary, that emissions events are simply not governed by permits and are
    instead subject to other regulations. In support of this contention, Exxon cites
    a portion of its 2012 agreed enforcement order with the TCEQ, which provides
    that “[e]missions events and [unplanned] MSS activities . . . are not subject to
    permitting under 30 TEX. ADMIN. CODE Chapters 106 or 116, and are regulated
    under 30 TEX. ADMIN. CODE Chapter 101 and TEX. HEALTH AND SAFETY CODE
    §§ 382.0215, 382.0216 and 382.085.” Exxon Mobil Corp., Docket No. 2011-2336-
    AIR-E, 
    2012 WL 780783
    , at *1 (Tex. Comm’n on Envtl. Quality Feb. 29, 2012).
    Based on this language, Exxon claims that “unauthorized” emissions from
    emissions events cannot violate a permit, because such emissions were never
    subject to permits in the first instance.
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    We see at least two problems with Exxon’s argument: first,
    “unauthorized emissions,” by definition, include “[e]missions of any air
    contaminant . . . that exceed any air emission limitation in a permit . . . .” 30
    TEX. ADMIN. CODE § 101.1(108). Second, the language from the TCEQ agreed
    enforcement order, read in conjunction with the regulatory framework it
    references, appears to indicate simply that Exxon cannot be issued a permit by
    rule (under Chapter 106) or a permit for new construction or modification
    (under Chapter 116) that allows for emissions events. See 
    id. §§ 106.4,
    116.10–
    20. But this does nothing to suggest that emissions from such events are
    incapable of violating a permit, as evidenced by the fact that the TCEQ found
    violations of Exxon’s permits— including state-issued permit 18287 and the
    corresponding Title V permit—stemming from Exxon’s “fail[ure] to prevent
    unauthorized emissions” during several discrete emissions events at the
    Baytown complex. Exxon Mobil Corp., 
    2012 WL 780783
    , at *4.
    We accordingly conclude that the district court erred as a matter of law
    in treating Count I as alleging violations of MAERT limits rather than special
    conditions 38 and 39. Furthermore, we note (as did the district court) that the
    alleged “violations under Count I overlap to an extent with hourly emission
    limit violations under Count II,” but we do not agree that this is a reason to
    collapse the MAERT limits with special conditions 38 and 39. Rather, as
    Plaintiffs made clear in the court below, Count I sets forth the alternative
    theory that every “emissions event” at the refinery constitutes a violation of
    the “no upset emissions” provisions incorporated into the refinery’s Title V
    permit. As such, we believe that the district court’s judgment on Count I should
    be vacated and the case remanded for reconsideration of Count I together with
    Count II, which we will now address.
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    3. Count II: MAERT Limits
    In Count II, Plaintiffs alleged that the “emissions events” set forth in
    Exxon’s reports and records encompassed over 13,000 days of violations of the
    hourly numerical emission limits for specific pollutants contained in the
    Maximum Allowable Emission Rate Tables (MAERTs) of incorporated permits
    governing the Baytown refinery, olefins plant, and chemical plant. The district
    court found that Plaintiffs had not proven any “actionable” MAERT violations
    under the relevant permits for the refinery and olefins plants and had proven
    a total of only 25 actionable violations under the relevant chemical plant
    permits. The court premised its findings on the determination that because the
    CAA citizen suit provision authorizes suits for “repeated or ongoing” violations
    of “an emission standard or limitation . . . in” a Title V permit, Plaintiffs had
    to prove repeated violations of the “same, specific” permit limitations. Env’t
    Tex., 
    66 F. Supp. 3d
    at 895, 898. In the district court’s view, this meant that
    Plaintiffs had to show repeated violations of identical numerical emission
    limits from the MAERTs. And because Plaintiffs had categorized the violations
    in their spreadsheets by pollutant, with the applicable numerical limits in the
    spreadsheets often varying wildly for the same pollutants from one entry to
    the next, the district court concluded that Plaintiffs had not shown repeated
    violations of most MAERT limits. On appeal, Plaintiffs contend that the
    district court erred in viewing different numerical limits on emissions of the
    same pollutants from the same sources as distinct “permit limitations” for
    purposes of assessing whether MAERT limit violations were repeated or
    ongoing.
    As noted previously, the CAA allows a person to bring a civil action
    “against any person . . . who is alleged to have violated (if there is evidence that
    the alleged violation has been repeated) or to be in violation of . . . an emission
    standard or limitation under [the Act].” 42 U.S.C. § 7604(a)(1). Based on this
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    provision, the district court in this case concluded (and neither party disputes
    on appeal) that for a CAA violation 5 to be “actionable” in a citizen suit, “the
    plaintiff must prove by the preponderance of the evidence one of the following”:
    either “repeated violation of the same emission standard or limitation before
    the complaint was filed” or “violation of the same emission standard or
    limitation both before and after the complaint was filed.” 6 Env’t Tex., 66 F.
    Supp. 3d at 894; see also Glazer v. American Ecology Envtl. Servs. Corp., 
    894 F. Supp. 1029
    , 1037–38 (E.D. Tex. 1995). Accordingly, because an “emission
    standard or limitation” includes any “standard,” “limitation,” “schedule,”
    “term,” or “condition” in a Title V permit, 42 U.S.C. § 7604(f)(4), Plaintiffs
    5  Exxon “[did] not dispute” in the court below that “the alleged violations under
    Count[] II . . . constitute violations of an emission standard or limitation.” Env’t Tex., 66 F.
    Supp. 3d at 893 n.153. Exxon attempts to argue on appeal that it “never admitted” any entries
    under Count II were violations, “and the district court plainly understood that position since
    it did not find liability on all of the allegations in” that count. However, Exxon’s argument—
    at least with respect to alleged violations under Count II—clearly runs contrary to its
    clarification at trial that “if Exxon Mobil files a reportable STEERS event, for example, in
    essence, it is making a report of releases that exceed, for example, an hourly limit with
    respect to a particular release.” Furthermore, the fact that STEERS reports and on-site
    records of “emissions events” reflect violations of emission standards or limitations does not
    mean that a defendant is per se liable under the citizen suit provision of the CAA. See 42
    U.S.C. § 7604(a)(1) (providing that violations must be “repeated” or ongoing). Thus, the fact
    that the district court “did not find liability on all of the” events under Count II is not proof
    that the district court believed many of the events counted as violations by Plaintiffs were
    not, in fact, violations. Finally, with respect to Exxon’s argument that specific entries in
    which the emission quantity—standing alone—would appear to fall below the applicable
    listed threshold were not shown to be violative of MAERT limits, we note that we were unable
    to locate in the record any point at which Exxon contested these entries before the district
    court. Rather, Exxon’s proposed findings of fact and conclusions of law focused on whether
    Count II violations were “repeated” or “ongoing,” and when asked directly by the district court
    “which events from the stipulated tables” it “claim[ed] [did] not constitute a violation,” Exxon
    did not mention Count II. Thus, to the extent Exxon asks us to conclude that most of the
    Count II violations, including a number of the violations that the district court found
    actionable, were not violations at all based on an argument it never raised below, we decline
    to do so. See, e.g., Violette v. Smith & Nephew Dyonics, Inc., 
    62 F.3d 8
    , 11 (1st Cir. 1995) (a
    defendant may not “evade the scrutiny of the district court” by raising a new defense on
    appeal “in order to create essentially a new trial”).
    6 The district court also noted a third alternative: namely, showing a “continuing
    likelihood of recurrence.” However, as the district court recognized, “Plaintiffs do not claim
    satisfaction of the third method of proving actionability.” Env’t Tex., 
    66 F. Supp. 3d
    at 894.
    14
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    No. 15-20030
    concede that they had to prove by the preponderance of the evidence that
    violations of the same, specific conditions or limitations in Exxon’s permits
    were “repeated” in the past or occurred at least once before Plaintiffs filed suit
    and at least once after.
    Despite this concession, Plaintiffs take issue with the district court’s
    finding that because violations were categorized in the spreadsheets and
    summaries by pollutant, with often-differing numerical limits listed, Plaintiffs
    failed to prove that most violations of specific MAERT limits were repeated or
    ongoing. Plaintiffs devote a significant portion of their brief on this point to the
    question of whether a MAERT limit for a particular pollutant from a particular
    source should be considered a single standard or limitation despite changes to
    the actual number of the limit over time. In short, Plaintiffs believe that
    multiple exceedances of MAERT limits on specific pollutants from specific
    emission points (or groups of emission points) should be considered “repeated”
    even if the numbers of the limits vary due to intermittent permit amendments
    or renewals. Yet as Exxon points out, variations in the limits listed in
    Plaintiffs’ spreadsheets may, in at least some instances, be attributable to the
    presence of distinct numerical limits for ordinary conditions and maintenance,
    startup, and shutdown (“MSS”) activity within a single version of a permit.
    E.g., PERMIT NO. 36476 (setting ordinary and MSS limits on chemical plant
    emissions). Nevertheless, the district court in this case did not distinguish
    between different emission limits in the same version of a permit and
    corresponding emission limits in different versions of a permit. Instead, the
    court simply determined that any time the listed “emission limit” in Plaintiffs’
    tables varied numerically, a new permit “standard or limitation” was at issue.
    We conclude that this was error.
    At least with respect to specific limits on particular pollutants from
    particular sources that change numerically due to amendments or renewals,
    15
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    No. 15-20030
    we believe that such limits constitute the same “standard[s] or limitation[s]”
    for purposes of determining whether violations are “repeated” or “ongoing”
    under the CAA citizen suit provision. 42 U.S.C. §§ 7604(a)(1) & (f)(4). This view
    is consistent with the approach taken by courts in assessing “ongoing”
    violations of Clean Water Act (“CWA”) permits. See Allen Cty. Citizens for the
    Env’t, Inc. v. BP Oil Co., 
    762 F. Supp. 733
    , 740–41 (N.D. Ohio 1991), aff’d, 
    966 F.2d 1451
    (6th Cir. 1992) (unpublished table decision). 7 In the CWA context,
    courts have focused on pollutants and whether those pollutants have been
    discharged at higher rates than authorized by a permit, not simply on whether
    the same numerical thresholds are at issue. See 
    id. at 740–41.
    We think this
    approach makes good sense given that, as the Fourth Circuit explained in a
    CWA case, “[t]he entire structure of [The Act] and regulations involves
    identifying specific pollutants and setting a permit limit for each pollutant of
    concern.” Chesapeake Bay Found. v. Gwaltney, 
    890 F.2d 690
    , 698 (4th Cir.
    1989). We accordingly hold that limits on emissions of specific pollutants from
    specific emission points (or groups of emission points in flexible permits)
    should constitute permit “emission standard[s] or limitation[s]” that may be
    violated repeatedly under the CAA citizen suit provision, regardless of whether
    the numerical values of the limits have been changed through amendments or
    renewals.
    In light of our holding, we must vacate the district court’s judgment on
    Count II. On remand, the district court is instructed to determine the correct
    number of actionable Count II violations when treating corresponding limits
    7 We acknowledge, as the district court in this case did, that “[t]he ‘to be in violation’
    provision in the CAA is identical to the ‘to be in violation’ provision in the CWA,” and
    “[i]nterpretations of the CWA provision are instructive when analyzing the CAA provision.”
    Env’t Tex., 
    66 F. Supp. 3d
    at 894 n.154; see also United States v. Anthony Dell’Aquilla, Enters.
    & Subsidiaries, 
    150 F.3d 329
    , 338 n.9 (3d Cir. 1998).
    16
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    No. 15-20030
    on the same pollutants from different versions of the relevant permits as the
    same “standard[s] or limitation[s]” under the CAA. 8
    4. Counts III and IV: HRVOCs and Smoking Flares
    Under Counts III and IV, Plaintiffs alleged 13 violations (for a total of 18
    days) of the incorporated “HRVOC rule” prohibiting emissions of highly
    reactive volatile organic compounds at a rate exceeding 1,200 lbs./hr. (Count
    III) and 42 violations (for a total of 44 days) of the incorporated “smoking flare
    rule” prohibiting visible emissions from flares for periods exceeding five
    minutes during any two-hour period (Count IV). The district court counted 9
    of the 13 HRVOC rule entries in Plaintiffs’ spreadsheets and 28 of the 42
    smoking flare rule entries as “violations,” finding that the remaining entries
    were not “corroborated” as violations of the rules because they either did not
    explicitly state limits had been exceeded or did not list opacity percentages and
    start/end times to allow for verification. Env’t Tex., 
    66 F. Supp. 3d
    at 901–02.
    On appeal, Plaintiffs claim that the district court erred in requiring
    “corroboration” of these entries, as “Exxon conceded at trial that all of the
    alleged violations under Counts III and IV constituted ‘violations of an
    emission standard or limitation.’”
    In an early portion of its order, the district court stated the following:
    “Exxon does not dispute that the alleged violations under Counts II, III, IV,
    and V of Plaintiffs’ complaint constitute violations of an emission standard or
    limitation.” Env’t Tex., 
    66 F. Supp. 3d
    at 893 n.153. Exxon argues on appeal
    that this statement referred only to “the actionability of various legal theories
    in general,” but we cannot agree. Far from merely acknowledging Exxon’s
    failure to dispute that Counts II, III, IV, and V involved “emission standards
    8 We also note, once again, that on remand, the district court should consider the
    overlap between Plaintiffs’ Count I and Count II claims with respect to refinery emissions.
    17
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    or limitations” that might hypothetically be violated, the district court
    expressly found it undisputed that “Exxon violated” standards and limitations
    under those counts. See 
    id. at 893.
    In making this finding, the court was
    undoubtedly relying on an exchange at trial during which the court directly
    asked counsel for Exxon “which events from the stipulated tables” it claimed
    “do not constitute a violation.” In response, counsel pointed only to events
    under Counts I, VI, and VII. Indeed, even after the court clarified that it was
    “not talking about repeated or ongoing[,] [j]ust talking about the definition of
    violations,” counsel for Exxon replied that “those are the three areas I’ll point
    the court to.”
    On the basis of this exchange, the district court clearly assumed each
    Count II event counted by Plaintiffs was undisputed as a violation, because it
    limited its focus in its findings of fact and conclusions of law to whether
    identical numerical permit limits were present in Plaintiffs’ tables such that
    repeated or ongoing violations of the same limits were “corroborated.” 9 See 
    id. at 899–900.
    In other words, the district court appears to have treated the
    statements by counsel for Exxon as judicial admissions that “with[drew]” the
    question of whether specific events were violations “from contention,” and it
    thus assumed the entries at issue under Count II were, factually, MAERT limit
    exceedances. See Martinez v. Bally’s La., Inc., 
    244 F.3d 474
    , 476–77 (5th Cir.
    2001). With respect to Counts III and IV, however, the district court concluded
    that a number of specific entries were not actionable because the entries
    themselves were not “corroborated” as violations. We find this differential
    treatment of Counts II, III, and IV irreconcilably inconsistent. If the district
    9 Indeed, it is for this very reason that we declined to address Exxon’s argument
    regarding whether specific emissions under Count II exceeded MAERT limits—Exxon never
    contested those emissions as violations below, and the district court rightly understood there
    to be no dispute on the point.
    18
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    No. 15-20030
    court believed there was a question as to whether particular events under the
    three counts constituted violations in the first instance, it should have
    analyzed each entry to determine whether, as a factual matter, the relevant
    limits were exceeded. If it believed the events under those counts were
    undisputed as violations, it should have analyzed simply whether the
    violations were “repeated” or “ongoing.” What the court did, however, was
    (1) analyze only whether violations, which it believed to be undisputed, were
    “repeated” or “ongoing” under Count II; and (2) analyze only whether specific
    entries corroborated violations of the relevant permit requirements under
    Counts III and IV. In light of the court’s analysis of Count II and its express
    finding that violations under Counts II, III, IV, and V were undisputed, we do
    not see how the district court’s treatment of entries counted by Plaintiffs as
    violations under Counts III and IV can be justified. We accordingly conclude
    that the district court erred in requiring “corroboration” for violations that, in
    a different portion of the same order, it explicitly found to be undisputed. On
    remand, the district court is instructed to include in its tally of Count III and
    Count IV violations the entries it rejected as “uncorroborated.”
    5. Count VII: Additional Violations in Deviation Reports
    Under Count VII, Plaintiffs alleged over 4,000 days of additional Title V
    permit violations based on “Title V deviation reports” that Exxon submitted to
    the TCEQ during the relevant time period. These reports contained entries
    reflecting the “emissions events” that were at issue in the other counts, as well
    as various non-emissions-related incidents (involving, for instance, reporting
    requirements). Plaintiffs asserted at trial that each incident contained in a
    deviation report constituted an actionable permit violation, and Exxon argued
    that none of the entries evinced “violations” at all under the definition of
    “deviation” set forth in the Texas Administrative Code. The district court
    agreed with Exxon, reasoning that (1) Texas law defines a deviation as merely
    19
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    No. 15-20030
    “[a]n indication of noncompliance with a term or condition of [a] permit,” 30
    TEX. ADMIN. CODE § 122.10(6); (2) Federal regulations confirm that “[a]
    deviation is not always a violation,” 40 C.F.R. § 71.6(a)(3)(iii)(C); and (3) given
    Plaintiffs’ decision to rely solely on the deviation reports themselves as
    evidence of underlying actionable violations, Plaintiffs had failed “to show how,
    in light of [the aforementioned] provisions, the Deviations at issue . . . [were]
    actual violations.” Env’t Tex., 
    66 F. Supp. 3d
    at 903.
    Plaintiffs contend on appeal that the district court misapplied the
    applicable “standard of proof” in its ruling on Count VII, as the deviation
    reports contained “all of the prima facie evidence needed to establish that a
    permit violation occurred.” They accordingly argue that because Exxon failed
    to rebut the evidence of violations contained in the reports, the district court
    should have ruled that every incident in a deviation report was an actionable
    violation. More specifically, Plaintiffs note that federal regulations allow
    regulated entities to submit “other information” indicating that a “reported
    deviation was not a violation,” and Exxon in this case “submitted no such
    information as part of any of the Deviation Reports at issue, nor did it submit
    any such information at trial.”
    We find Plaintiffs’ argument unpersuasive. While their briefing of Count
    VII is devoid of authority in support of their contentions regarding the “burden
    of proof,” Plaintiffs appear to be referring to their earlier reliance on cases
    reflecting that “a permittee’s own records of violations are sufficient to
    establish liability.” However, the cases Plaintiffs cite do not support the
    proposition that deviation reports specifically are sufficient to establish
    violations (as opposed to merely constituting “indications” of noncompliance).
    For example, the one CAA case Plaintiffs rely on involved Louisiana’s
    permitting and reporting system, which requires the filing of written reports
    “each time the refinery has an ‘unauthorized discharge.’” St. Bernard Citizens
    20
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    No. 15-20030
    for Envtl. Quality, Inc. v. Chalmette Ref., L.L.C., 
    354 F. Supp. 2d 697
    , 706 (E.D.
    La. 2005). These reports would be akin to the STEERS reports mandated by
    the TCEQ, not the deviation reports at issue under Count VII. See also
    Concerned Citizens Around Murphy v. Murphy Oil USA, Inc., 
    686 F. Supp. 2d 663
    , 680 (E.D. La. 2010) (recognizing that “unauthorized discharge reports
    demonstrate that [the defendant] violated emission standards or limitations”).
    Furthermore, to the extent Plaintiffs point to a lack of “other
    information” showing that deviations were not violations, testimony regarding
    the significance of stand-alone deviations and their relationship to compliance
    certification is precisely the type of evidence that could have aided the district
    court in resolving Count VII. See Compliance Assurance Monitoring, 62 Fed.
    Reg. 54,900, 54,937 (Oct. 22, 1997) (providing that a regulated entity “may
    include information in the certification to document that compliance was
    achieved”). In the absence of such evidence, however, we see no error in the
    district court’s conclusion that the Count VII deviation reports alone were
    insufficient to meet Plaintiffs’ ultimate burden of proving actionable
    violations. 10 See Carr v. Alta Verde Indust., Inc., 
    931 F.2d 1055
    , 1064 n.7 (5th
    Cir. 1991) (noting that “the burden [is] on the plaintiff to prove at trial his
    allegations of a continuing or intermittent violation”).
    B. Remedies
    Under the CAA, district courts have jurisdiction in citizen suits “to
    enforce” emission standards or limitations and “to apply any appropriate civil
    10 We do not hold that deviation reports will always be insufficient to prove actual
    permit violations. Indeed, we note that some of the Count IV violations stem from information
    contained in deviation reports. We only conclude that, based on the record before us in this
    case, there was no error in the district court’s refusal to find an actionable violation in every
    Count VII deviation. Because Plaintiffs chose to rely exclusively on the existence of the
    deviation reports, with little attempt to clarify their significance, as proof of hundreds of
    violations of different regulatory requirements, we see no basis (and Plaintiffs have not
    provided one on appeal) to disagree with the district court’s resolution of Count VII.
    21
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    penalties.” 42 U.S.C. § 7604(a). For the thousands of days of permit violations
    alleged in this lawsuit, Plaintiffs sought (1) a declaratory judgment that Exxon
    had violated its permits (and thus the CAA); (2) a statutory penalty of over
    $600 million (to be deposited in a special fund for use by the EPA pursuant to
    42 U.S.C. § 7604(g)(1)); and (3) a permanent injunction prohibiting further
    permit violations. 11 The district court declined to order any of Plaintiffs’
    requested relief. Plaintiffs now argue that (1) the district court abused its
    discretion in declining to issue a declaratory judgment, (2) the district court
    committed numerous errors (and thus abused its discretion) in declining to
    impose any penalties, and (3) the district court abused its discretion in
    declining to grant a permanent injunction. We will address each form of relief
    in turn.
    1. Declaratory Judgment
    The district court in this case refused to issue a declaratory judgment
    that Exxon had violated its permits and the CAA, because while it recognized
    that it was “undisputed Exxon violated some emission standards or
    limitations,” it viewed the more important issue as “whether any such
    violations are actionable under the CAA as a citizen suit”—and the court had
    “already made these findings.” Env’t Tex., 
    66 F. Supp. 3d
    at 903. Plaintiffs now
    argue that the district court should have issued a declaratory judgment in
    order to “defin[e] and clarif[y] the nature of Exxon’s liability under the CAA.”
    A determination of whether to grant declaratory relief is within the
    district court’s discretion, and a decision to deny declaratory relief is thus
    reviewed only for abuse of that discretion. United Teacher Assoc. Ins. Co. v.
    Union Labor Life Ins. Co., 
    414 F.3d 558
    , 569 (5th Cir. 2005). As we have
    11Plaintiffs also sought attorneys’ fees and costs and appointment of a “special
    master” to monitor implementation of relief, but these are not at issue in the present appeal.
    22
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    previously explained, “[t]he two principal criteria guiding” the decision of
    whether to render a declaratory judgment “are (1) when the judgment will
    serve a useful purpose in clarifying and settling the legal relations in issue,
    and (2) when it will terminate and afford relief from the uncertainty,
    insecurity, and controversy giving rise to the proceeding.” Concise Oil & Gas
    P’ship v. La. Intrastate Gas Corp., 
    986 F.2d 1463
    , 1471 (5th Cir. 1993) (quoting
    10A CHARLES ALAN WRIGHT, ARTHUR R. MILLER & MARY K. KANE, FEDERAL
    PRACTICE AND PROCEDURE § 2759 (2d ed. 1987)).
    In this regard, we have recognized that a declaratory judgment may not
    serve a “useful purpose” when a fact-finder has already “settl[ed] the legal
    relations in issue.” Id.; see also Am. Equip. Co., Inc. v. Turner Bros. Crane and
    Rigging, LLC, No. 4:13-CV-2011, 
    2014 WL 3543720
    , at *3 (S.D. Tex. July 14,
    2014) (“Courts in the Fifth Circuit regularly reject declaratory judgment claims
    seeking the resolution of issues that will be resolved as part of the claims in
    the lawsuit.”). In Concise Oil, for instance, Plaintiffs brought an action for
    breach of contract and sought a declaratory judgment that the contract was
    valid; however, we declined to reverse the district court’s determination that
    such declaratory relief was unwarranted, because “the jury’s verdict and our
    affirmance . . . on breach conclusively refute[d]” the contention that the
    contract had been terminated (as the defendants 
    maintained). 986 F.2d at 1471
    . In the present case, the district court, sitting as fact-finder, found that
    Exxon had committed over 90 actionable violations of its permits (thus also
    violating the CAA). And while we vacate the district court’s judgment, our
    “affirmance” of the broad conclusion that Exxon committed actionable
    violations of its permits diminishes any “useful purpose” that a declaratory
    judgment on that point might otherwise serve. As such, we find no abuse of
    discretion in the district court’s decision not to grant declaratory relief.
    23
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    No. 15-20030
    2. Penalties
    As noted previously, the district court in this case went beyond merely
    concluding that no statutory penalties under the CAA were warranted for the
    few violations it found actionable—rather, the district court broadly concluded
    that “even if the Court had found every Event and Deviation in this case is
    actionable, the Court would still find Exxon should not be penalized,” and it
    proceeded to analyze each penalty factor from that perspective. Env’t Tex., 
    66 F. Supp. 3d
    at 904. Plaintiffs argue on appeal that the district court erred in
    its assessment of four of the statutory penalty factors, and thus its ultimate
    refusal to assess a penalty was an abuse of discretion. We will begin by
    discussing penalties under the CAA generally and will then address Plaintiffs’
    arguments with respect to each penalty factor as the district court applied it
    in this case.
    i. CAA Penalties Generally
    The CAA provides that in a citizen suit, “[a] penalty may be assessed for
    each day of violation.” 42 U.S.C. § 7413(e)(2). The parties agree on appeal that
    imposition of a civil penalty is not mandatory under the CAA; rather, the
    decision whether to impose a penalty rests in the discretion of the court. 12 See,
    e.g., Pound v. Airosol Co., Inc., 
    498 F.3d 1089
    , 1094 (10th Cir. 2007) (referring
    to “the penalty, if any, to be assessed for a violation of the Act”). In deciding
    whether to impose a penalty, however, a court must “take into consideration”
    seven statutory factors, “in addition to such other factors as justice may
    require.” See 42 U.S.C. § 7413(e)(1) (providing that the court “shall take [the
    factors] into consideration”); 
    Pound, 498 F.3d at 1097
    –98 (recognizing that the
    12 Exxon expends considerable brief space rebutting what it views as “Plaintiffs’ theory
    that civil penalties are mandatory.” However, it is fairly obvious from Plaintiffs’ briefing that
    they concede the point and do not argue that the district court was required to impose
    penalties as a matter of law.
    24
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    statutory factors “must be considered in a CAA penalty analysis”). These
    factors are:
    (1) the size of the business;
    (2) the economic impact of the penalty on the business;
    (3) the violator’s full compliance history and good faith efforts to comply;
    (4) the duration of the violation as established by any credible evidence;
    (5) payment by the violator of penalties previously assessed for the same
    violation;
    (6) the economic benefit of noncompliance; and
    (7) the seriousness of the violation.
    42 U.S.C. § 7413(e)(1).
    In the present case, the district court concluded that the “size of the
    business” and “economic impact of the penalty” factors weighed in favor of
    assessing a penalty, as “Exxon [would] only be impacted by a large penalty and
    has the ability to pay the alleged maximum penalty.” Env’t Tex., 
    66 F. Supp. 3d
    at 904. Plaintiffs do not contest this conclusion on appeal, for obvious
    reasons. The district court also concluded that because Exxon had previously
    paid $1,423,632 in penalties for some of the violations at issue (as a result of
    TCEQ enforcement actions), that amount should be “deducted from any
    penalty otherwise warranted.” 
    Id. at 907.
    Plaintiffs likewise do not contest the
    district court’s resolution of this factor. With respect to the remaining factors,
    however, the district court concluded that each one either weighed against
    assessing a penalty or, at most, weighed neither for nor against assessing a
    penalty, and Plaintiffs vigorously contest the district court’s resolution and
    weighing of these remaining factors. We will accordingly address each penalty
    factor in roughly the same order as the district court, keeping in mind that
    25
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    (1) a district court’s analysis of the penalty factors is subject to review only for
    abuse of discretion, and (2) underlying factual findings are reviewed only for
    clear error. Sierra Club v. Cedar Point Oil Co. Inc., 
    73 F.3d 546
    , 573 (5th Cir.
    1996); see also United States ex rel. Adm’r of EPA v. CITGO Petroleum Corp.,
    
    723 F.3d 547
    , 551 (5th Cir. 2013) (quoting Tull v. United States, 
    481 U.S. 412
    ,
    427 (1987)) (acknowledging that “the process of weighing” similar CWA
    penalty factors is “highly discretionary,” and thus “[a] court’s determination of
    the amount of a penalty to be assessed is reviewed under the highly deferential
    abuse-of-discretion standard”).
    ii. Compliance History and Good Faith Efforts to Comply
    The district court in this case determined that Exxon’s compliance
    history and good faith efforts to comply with its permits weighed against
    assessment of a penalty. At the outset, the court noted that “the number of
    [events] at issue in this case [was] high” and might suggest that Exxon’s
    compliance history was “arguably inadequate.” Env’t Tex., 
    66 F. Supp. 3d
    at
    904–05. However, the court found that based on the extremely large size of the
    facility, it would not be “possible to” eliminate all emissions events, and thus
    “the number of Events and Deviations alone is not the best evidence of
    compliance history” or “good faith effort to comply.” 
    Id. at 905.
    Rather, the
    district court concluded that Exxon “made substantial efforts to improve
    environmental performance and compliance” based on (1) the “significant
    reduction” in overall unauthorized emissions at the complex “over the years at
    issue in this case”; (2) Exxon’s agreement to undertake environmental
    improvement projects at the complex in an enforcement order with the TCEQ;
    (3) the lack of “credible evidence” that any of the alleged violations “resulted
    from a recurring pattern”; and (4) the “persuasive and credible” testimony from
    a chemical engineer and a former TCEQ official that Exxon’s “concerted
    26
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    effort[s] to comply” had contributed to the Baytown facility’s reputation as a
    “leader[] in maintenance and operation practices.” 
    Id. at 905–06.
          On appeal, Plaintiffs raise several challenges to the district court’s
    analysis of this factor. First, Plaintiffs contend that the district court
    essentially “invok[ed] presumed impossibility of compliance ‘as a reason to not
    impose penalties’” despite clear precedent and regulatory language indicating
    that “‘impossibility is not a defense’” to compliance with one’s permits. In this
    regard, Plaintiffs correctly identify that under Texas law, it is not “a defense
    in an enforcement action that it would have been necessary to halt or reduce
    the permitted activity in order to comply with the permit terms and conditions
    of the permit.” 30 TEX. ADMIN. CODE § 122.143(4). In other words, if a regulated
    entity is incapable of operating in compliance with its permits, the “one simple
    and straightforward way . . . to avoid paying civil penalties” is to “cease[]
    operations until it [is] able to” do so. Atl. States Legal Found., Inc. v. Tyson
    Foods, Inc., 
    897 F.2d 1128
    , 1141–42 (11th Cir. 1990). However, as the district
    court in this case plainly noted, its invocation of Exxon’s size and the
    infeasibility of achieving full compliance was not an attempt to raise
    impossibility as a bar to imposing penalties; rather, the district court’s
    discussion on this point was simply a recognition that compliance history and
    good faith efforts to comply should be viewed in the context of the size and
    complexity of the emitting facility at issue, and thus “the number of [emissions
    events] does not alone mean Exxon did not make a good faith effort comply”
    with its operating permits for this particular complex. Env’t Tex., 
    66 F. Supp. 3d
    at 905 n.221. We accordingly reject Plaintiff’s first argument.
    Plaintiffs next claim that the district court clearly erred in finding that
    Exxon’s agreement to undertake four environmental improvement projects
    constituted a “substantial effort[]” at achieving compliance that demonstrated
    “good faith.” Plaintiffs argue that the agreement merely imposed toothless and
    27
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    overdue requirements in an attempt by Exxon and complicit TCEQ officials to
    “undercut more stringent citizen enforcement,” as evidenced by the fact that
    the agreement “was negotiated, at Exxon’s instigation, only after” Plaintiffs
    gave notice of their intent to file suit. On this point, we think it is possible that
    the agreement between Exxon and the TCEQ is a sterling example of
    regulatory capture at its worst; however, it is also entirely possible that
    Exxon’s explanation for pursuing the agreement—that it wanted more
    “certainty” in enforcement—is valid and that the company did want to take
    good-faith steps towards reducing future compliance issues. Thus, given that
    there are “two permissible views of the evidence,” the district court was
    entitled to take the view it did, and we cannot second-guess that view now.
    U.S. Bank Nat’l 
    Ass’n, 761 F.3d at 431
    .
    Finally, Plaintiffs argue that the district court “did not consider several
    other factors relevant to Exxon’s compliance history,” including “the number
    of similar violations in the past” and “the prior enforcement lawsuit brought
    by the United States.” We were unable to discern, however, in what way
    Plaintiffs believe the district court’s failure to consider these “factors” was
    erroneous—the authority cited in Plaintiffs’ briefing, a CWA order from the
    Southern District of Mississippi applying that statute’s “history of violations”
    penalty factor, merely recognizes that “courts consider . . . the duration and
    nature of” past and present violations under the Act. United States v. Gulf Park
    Water Co., Inc., 
    14 F. Supp. 2d 854
    , 864 (S.D. Miss. 1998). Nowhere does the
    Gulf Park court state that specific consideration of the factors listed by
    Plaintiffs is required (or even appropriate) in all cases, and we have no reason
    to believe it would be. We accordingly conclude that the district court in this
    case did not abuse its discretion in determining that the “compliance history
    28
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    and good faith efforts to comply” penalty factor weighed against imposition of
    a penalty. 13
    iii. Economic Benefit of Noncompliance
    The “economic benefit of noncompliance” factor directs courts to
    “consider the financial benefit to the offender of delaying capital expenditures
    and maintenance costs on pollution-control equipment.” 
    CITGO, 723 F.3d at 552
    . We have recognized in the Clean Water Act context that “a district court
    generally must make a ‘reasonable approximation’ of economic benefit when
    calculating a penalty under [the Act],” as a finding on the amount of economic
    benefit is “central to the ability of a district court to assess the statutory factors
    and for an appellate court to review that assessment.” 
    Id. at 552,
    554 (quoting
    Cedar Point 
    Oil, 73 F.3d at 576
    ). We have also identified at least two general
    approaches to calculating economic benefit: “‘(1) the cost of capital, i.e., what it
    would cost the polluter to obtain the funds necessary to install the equipment
    necessary to correct the violation; and (2) the actual return on capital, i.e., what
    13 Plaintiffs raise two additional arguments in their briefing: first, they argue that
    Exxon’s own calculations regarding the potential for implementation of additional emissions-
    reducing technologies at the complex demonstrate that at least some of the violations were
    preventable, cutting against Exxon’s “good faith efforts to comply.” However, what Plaintiffs
    fail to mention is that Exxon’s witness merely used calculations done by Plaintiffs as to the
    amount of emissions that could have been prevented by implementation of the relevant
    technology in order to show that even “giving every benefit of the doubt” to “Plaintiffs’ theory,”
    implementation of the technology would not have been economically reasonable. As such,
    Plaintiffs have not shown clear error on this basis.
    Second, Plaintiffs note the inconsistency between the district court’s conclusion that
    no “improvements could have been made to prevent recurrence” and the court’s finding that
    the four TCEQ-mandated environmental improvement projects “will reduce unlawful
    emissions.” For reasons we discuss in connection with the “economic benefit of
    noncompliance” factor, we do perceive a tension between the district court’s finding that the
    projects reflect “substantial efforts to improve . . . compliance” and its finding that no
    improvements could have “prevented” any emissions events involved in this case. Env’t Tex.,
    
    66 F. Supp. 3d
    at 905. Nevertheless, in light of the district court’s other reasons for weighing
    this factor as it did, we cannot conclude that this tension alone renders the court’s overall
    resolution of the “compliance history and good faith efforts to comply” factor an abuse of
    discretion. See 
    CITGO, 723 F.3d at 551
    (referring to our review of penalty factors as “highly
    deferential”).
    29
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    the polluter earned on the capital that it declined to divert for installation of
    the equipment.’” 
    Id. at 552
    (quoting United States v. Allegheny Ludlum Corp.,
    
    366 F.3d 164
    , 169 (3d Cir. 2004)). 14 In the present case, the district court
    determined that “the most reasonable estimate of Exxon’s economic benefit of
    noncompliance is $0.” Env’t Tex., 
    66 F. Supp. 3d
    at 908. In making this
    determination, the district court appears to have concluded that Plaintiffs
    failed to provide credible evidence of any “pollution-control equipment” that
    would have “correct[ed]” any of the alleged violations under either of the
    approaches to calculating economic benefit previously identified. Indeed, the
    district court rejected testimony from Plaintiffs’ expert on pollution-control
    technology, Mr. Bowers, as “vague and undetailed” and found that “neither
    Bowers nor any other evidence credibly demonstrated that any of Bowers’s
    suggested capital improvements would have prevented any of the [violations].”
    
    Id. at 907–08.
    Notably, the court also alluded to the four environmental
    improvement projects from the TCEQ agreed enforcement order 15 as “an effort
    to reduce emissions and unauthorized emissions events” and appeared to treat
    14 We have also recognized multiple approaches to the related question of how to “set
    the amount of the penalty” overall: “some courts use the ‘top down’ approach in which the
    maximum penalty is set . . . and reduced as appropriate considering the . . . enumerated
    [penalty factors] as mitigating factors, while other courts employ the ‘bottom up’ approach,
    in which economic benefit is established, and the remaining . . . elements . . . are used to
    adjust the figure upward or downward.” 
    Id. In the
    present case, the district court appears to
    have simply weighed the factors independently without adopting either approach—as it felt
    it had discretion to do—and the court noted that the result would be the same under any
    approach. Env’t Tex., 
    66 F. Supp. 3d
    at 912 n.267. Regardless, Plaintiffs do not challenge the
    district court’s overall approach to “set[ting] the amount of the penalty.”
    15 The four improvement projects are (1) plant automation venture—installing
    computer programs to monitor, identify, diagnose, and guide operations, which will help
    identify potential events so they can be addressed proactively; (2) fuels north flare system
    monitoring/minimization: additional monitoring probes and “on-line analyzers” that improve
    sensing and characterizing flaring events; (3) BOP/BOPX recovery unit simulators:
    developing and using “high-fidelity process training simulators” to improve operator training
    and reduce emissions events; (4) enhanced fugitive emissions monitoring: using infrared
    technology to locate leaks. Exxon Mobil Corp., 
    2012 WL 780783
    , at *8–*9.
    30
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    these projects as an indication that Exxon did not receive any economic benefit.
    
    Id. at 908.
    On appeal, Plaintiffs contend that the district court erred in ignoring
    evidence of economic benefit stemming from Exxon’s own admissions and the
    TCEQ’s agreed enforcement order. We agree that the district court erred in
    failing to enter findings on whether the four environmental improvement
    projects from the TCEQ order constitute evidence of economic benefit from
    noncompliance. 16
    Caselaw makes clear that “economic benefit” in the penalty context can
    be calculated as the “benefit realized by a violator from delayed expenditures
    to comply with the [Act].” Allegheny Ludlum 
    Corp., 366 F.3d at 178
    (emphasis
    added) (analyzing the “economic benefit” penalty factor under the Clean Water
    Act). Courts applying this factor thus often “start[] with the ‘costs spent’ or that
    should have been spent to achieve compliance,” then “apply an interest rate to
    determine the present value of the avoided or delayed costs.” 
    Id. (quoting United
    States v. Smithfield Foods, Inc., 
    191 F.3d 516
    , 530 (4th Cir. 1999)). In
    other words, the effect of spending money to achieve compliance is often not
    mitigation of economic benefit—rather, plaintiffs may point to such
    expenditures as evidence of the regulated entity’s economic benefit to the
    extent the delay in making those expenditures allowed the regulated entity to
    use the money it saved productively. See United States v. Gulf Park Water Co.,
    Inc., 
    14 F. Supp. 2d 854
    , 863–64 (S.D. Miss. 1998). For instance, the defendants
    in Gulf Park were alleged to have violated the CWA by discharging pollutants
    into United States waters without a required NPDES permit, and in an earlier
    proceeding, the district court ordered them to pay a deposit necessary to
    connect to a regional wastewater system. 
    Id. at 857.
    The defendants complied
    16  Plaintiffs’ argument about Exxon’s “admissions” regarding implementation of
    emissions-reducing technologies is the same argument that we addressed, and rejected, in
    footnote 
    13, supra
    .
    31
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    and connected to the system in 1997—subsequently, in assessing the penalty
    factors under the CWA, the district court concluded there was “no doubt that
    the defendants . . . enjoyed an economic benefit in not having expended the
    funds necessary to connect to the Regional system in 1985, in 1989 or in 1991.”
    
    Id. at 864.
    The court also noted that while the plaintiffs had the burden of
    establishing economic benefit, “[t]he determination of economic benefit does
    not require an elaborate evidentiary showing,” as it is incumbent upon the
    court to “endeavor to reach” an estimate that “‘encompass[es] every benefit that
    defendants received from violation of the law’” regardless of the inherently
    “imprecise” or “somewhat speculative” nature of the inquiry. 
    Id. at 863–64
    (quoting United States v. Mac's Muffler Shop, Inc., 
    25 ERC 1369
    , 
    1986 WL 15443
    , at *8 (N.D. Ga. Nov. 4, 1986)).
    Turning to the present case, the district court rejected Mr. Bowers’
    expert testimony regarding specific measures that could have been taken to
    achieve compliance as not “credible,” and because we are extremely deferential
    to a district court’s assessment of witness credibility, we conclude that this was
    not clearly erroneous. See Canal Barge Co., Inc. v. Torco Oil Co., 
    220 F.3d 370
    ,
    375 (5th Cir. 2000) (“We cannot second guess the district court’s decision to . .
    . discount a witness’ testimony.”). However, Plaintiffs also elicited detailed
    testimony from their economic benefit expert, Mr. Shefftz, about the benefit
    stemming specifically from the four environmental improvement projects
    contained in the TCEQ agreed enforcement order, and Mr. Shefftz made clear
    in his testimony that the calculation of benefit with respect to these projects
    did not rely on Mr. Bowers’ inputs at all 17—rather,                    Mr. Shefftz took
    17 Mr. Shefftz did testify that the improvement projects should be considered a “subset
    of the total amounts” drawn from Mr. Bowers’ testimony, but this does not undercut the
    validity of the TCEQ projects as independent evidence of economic benefit. Mr. Shefftz’s point
    was simply that because Mr. Bowers’ suggested improvements would ostensibly encompass
    every measure needed to bring Exxon’s facility to 0 permit violations, the $11.7 million
    32
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    implementation dates from the order itself and cost estimates from one of
    Exxon’s environmental coordinators and used those figures to calculate the
    overall benefit from delaying implementation of the TCEQ projects between
    2005 and 2012. Mr. Shefftz calculated that this amount was approximately
    11.7 million dollars. Based on Mr. Shefftz’s testimony, Plaintiffs argued in
    their proposed findings of fact and conclusions of law that Exxon gained an
    economic benefit of at least this amount by not implementing the TCEQ
    projects earlier—which, according to testimony from Exxon’s own employees
    in the environmental department at the Baytown facility, it could have done.
    Nevertheless, while the district court expressly found that Mr. Shefftz’s
    methodology for calculating economic benefit was reliable, it did not treat the
    TCEQ projects as potentially indicative of Exxon’s economic benefit from
    noncompliance. Rather, it treated the projects as an indication that Exxon did
    not receive an economic benefit. In light of the evidence adduced by Plaintiffs,
    we believe the court should have made findings on the critical question of
    whether Exxon received a benefit from failing to implement the TCEQ projects
    earlier. 18
    benefit calculated by Mr. Shefftz with respect to the TCEQ projects should not be added on
    to the overall estimate of economic benefit. But this does nothing to suggest that the district
    court’s rejection of Mr. Bowers’ testimony also somehow precludes consideration of the TCEQ
    projects as evidence of economic benefit. Indeed, Mr. Shefftz explained that “[c]onceptually,
    it’s a subset of [the overall estimate], but . . . it’s also independent of [Bowers’] expert opinion.”
    18 Two arguments raised by Exxon warrant mention here: first, Exxon insisted at oral
    argument that the TCEQ order represents a regulatory decision to “forgo” maximum
    penalties in favor of other “corrective action,” and allowing a citizen suit to “capitalize” on the
    economic costs in the order by using them as economic benefits would be unfair—but this
    argument about compliance efforts “negating” economic benefit is precisely the argument
    that various courts have rejected under the economic benefit factor. As one district court
    recently stated, economic benefit is not “now negated by the fact that [the defendant] is
    working to remedy the issues . . . ,” because “the fact that [the defendant] must pay to bring
    his facility into compliance . . . does not excuse his history of noncompliance.” Magar, 
    2015 WL 632367
    , at *5. Relatedly, in its response to Plaintiffs’ 28(j) letter, Exxon quoted the
    Supreme Court’s opinion in Gwaltney for the proposition that allowing citizens to “file suit .
    . . in order to seek the civil penalties that [a regulatory agency] chose to forgo” would “curtail[]
    33
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    We acknowledge that both of the approaches to calculating economic
    benefit identified in our caselaw require some showing that delayed
    expenditures would be “necessary to correct” the violations at issue in the suit.
    See 
    CITGO, 723 F.3d at 552
    . In the present case, the district court found no
    credible evidence to indicate that “any of Bowers’s suggested capital
    improvements would have prevented any of the Events or Deviations,” with
    the necessary implication being that none of those improvements would
    “correct” the violations. Env’t Tex., 
    66 F. Supp. 3d
    at 908 (emphasis added).
    However, because the district court failed to address Plaintiffs’ evidence that
    Exxon received an economic benefit from delayed implementation of the TCEQ
    projects, it did not consider whether those projects were necessary to correct
    the violations. Looking to the order in which the projects are described, the
    TCEQ has specified that they “will reduce emissions at the Baytown Complex,
    including emissions from emissions events.” Exxon Mobil Corp., Docket No.
    2011-2336-AIR-E, 
    2012 WL 780783
    , at *8 (Tex. Comm’n on Envtl. Quality Feb.
    29, 2012). Furthermore, some of the projects appear to be correlated in at least
    a general way with at least some of the violations upon which Plaintiffs have
    sued. For example, one project aims to “more effectively monitor and
    troubleshoot” a refinery flare system in order to “improve the identification and
    considerably” the regulator’s “discretion to enforce the Act.” Gwaltney of Smithfield, Ltd. v.
    Chesapeake Bay Found., Inc., 
    484 U.S. 49
    , 61 (1987). Exxon’s reference to Gwaltney is
    unhelpful, however, because the Supreme Court’s discussion on this point was in the context
    of interpreting the Clean Water Act’s “to be in violation” language as barring citizen suits
    based on “wholly past violations of the Act.” 
    Id. at 60.
    Yet as both parties acknowledge, the
    Clean Air Act was amended in 1990 to authorize citizen suits against any person “who is
    alleged to have violated” the Act. 42 U.S.C. § 7604(a)(1) (emphasis added). This amendment
    has been viewed as a direct response to Gwaltney, and indeed, neither party in this case
    disputes that the “to have violated” language authorizes citizen suits based on wholly past
    violations of the CAA. See Atl. States Legal Found., Inc. v. United Musical Instruments,
    U.S.A., Inc., 
    61 F.3d 473
    , 477 (6th Cir. 1995) (recognizing that “after Gwaltney, Congress
    amended the Clean Air Act . . . explicitly to allow citizen suits for purely historical violations
    . . . .”). Thus, the proposition to which Exxon’s Gwaltney quotation lends support appears to
    no longer apply in CAA citizen suits.
    34
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    characterization of flaring events” (Count IV), and the order estimates that the
    projects will specifically achieve reductions in HRVOC emissions (Count III).
    
    Id. at *7–*8.
    Finally, the district court itself recognized in its order that the
    projects reflect “an effort to reduce emissions and unauthorized emissions
    events” at the Baytown complex. Env’t Tex., 
    66 F. Supp. 3d
    at 908. Thus, given
    that Plaintiffs adduced evidence regarding the benefit that Exxon received
    from foregoing earlier implementation of these projects, we conclude that the
    district court erred in failing to consider that evidence and enter specific
    findings as to whether the projects demonstrate that Exxon received an
    economic benefit from noncompliance. On remand, the district court is
    instructed to enter such findings, which will entail consideration of whether
    the projects are “necessary to correct” the violations at issue in this suit. 19
    iv. Duration of the Violation
    Under the CAA, courts must consider “the duration of the violation as
    established by any credible evidence” in determining whether and to what
    extent a penalty should be assessed. 42 U.S.C. § 7413(e)(1) (emphasis added).
    The district court in this case determined that the “duration of the violation”
    factor weighed neither for nor against imposition of a penalty, because “the
    duration of each of the [violations] differ[ed] tremendously,” and Plaintiffs
    sought maximum penalties for each emissions event regardless of length. Env’t
    Tex., 
    66 F. Supp. 3d
    at 906–07. Significantly, the court found that some of the
    19 In making its findings on remand, the court should be mindful that the economic
    benefit estimate must “‘encompass every benefit that defendants received from violation of
    the law’” regardless of the inherently speculative nature of the inquiry. Gulf Park, 
    14 F. Supp. 2d
    at 864 (quoting Mac’s Muffler Shop, 
    1986 WL 15443
    at *8). We thus believe that
    compliance expenditures or projects need not be tied specifically to prevention of each
    violation in order to establish that they are “necessary to correct” the violations overall,
    particularly in a case such as this where the violations are extensive and varied. Rather, we
    believe the inquiry should center on whether the projects will ameliorate the kinds of general
    problems that have resulted in at least some of the permit violations upon which Plaintiffs
    have sued.
    35
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    violations were of “long” duration, but because other violations were “short,”
    the court concluded that the factor was neutral overall. On appeal, Plaintiffs
    argue that the district court abused its discretion in concluding that this factor
    did not weigh in favor of imposing a penalty, because the court essentially
    viewed shorter violations as “offset[ting]” the violations of longer duration.
    As Plaintiffs note, there is some authority in support of the proposition
    that, when multiple “intermittent” violations over a span of time are at issue,
    a court may consider the overall length of the period during which the
    violations occurred (rather than assessing each violation individually). See,
    e.g., United States v. Midwest Suspension and Brake, 
    824 F. Supp. 713
    , 736–
    37 (E.D. Mich. 1993); United States v. A.A. Mactal Construction Co., Inc., No.
    89-2372-V, 
    1992 WL 245690
    , at *3 (D. Kan. Apr. 10, 1992). In the present case,
    however, the district court appears to have read the statutory language as
    literally mandating that the duration of each “violation” within a series of
    violations over time be considered. Env’t Tex., 
    66 F. Supp. 3d
    at 907 (discussing
    the durations of individual events). We need not resolve whether the “duration
    of the violation” factor requires scrutiny of the length of each individual
    violation or allows for assessment of an overall violation period, as even
    assuming the former approach is a proper one, the district court abused its
    discretion in this case by viewing violations as effectively offsetting each other.
    An example serves to effectively illustrate the nature of the district
    court’s error: had Plaintiffs cherry-picked from Exxon’s reports only the
    violations that the district court found to be “long,” the court would have been
    unable to use “variability in duration” as a reason to conclude that this factor
    was neutral. Thus, given that Plaintiffs included with these long violations a
    host of other short violations, it would make little sense to say that the
    “duration of the violation” factor somehow applies differently to the lengthy
    violations in light of the inclusion of the short ones. Exxon claims that because
    36
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    it was actually the Plaintiffs who “fail[ed] to differentiate events based on
    duration . . . at trial,” the district court “was free to reject Plaintiffs’ all-or-
    nothing approach.” However, the fact that Plaintiffs sought maximum
    penalties for each violation, regardless of length, has no bearing on whether
    the district court appropriately considered “the duration of the violation” under
    the CAA. See 
    Pound, 498 F.3d at 1097
    –98 (noting that the court must consider
    each statutory factor in a CAA penalty analysis). Indeed, it is undisputed that
    Plaintiffs’ spreadsheets set forth the individual durations of the events at
    issue, and Plaintiffs’ repeatedly made clear the overall time period within
    which violations were alleged to have occurred. Thus, because the district court
    opted to consider the durations of violations individually, it should have
    considered whether any violation, standing alone, was sufficiently long to
    justify imposition of a penalty. Its failure to do so, and its decision to instead
    view the factor as neutral based on overall duration variability, was an abuse
    of discretion.
    v. Seriousness of the Violation
    In assessing the “seriousness of the violation” penalty factor, courts
    outside of this circuit have looked to the “risk or potential risk of environmental
    harm” posed by emissions/discharges and have found violations to be serious
    “even absent proof of actual deleterious effect.” 
    Pound, 498 F.3d at 1099
    .
    Furthermore, courts have recognized that the overall number and quantitative
    severity of emissions or discharges may properly be relied upon as evidence of
    seriousness. See Pub. Interest Research Grp. of N.J., Inc. v. Powell Duffryn
    Terminals Inc., 
    913 F.2d 64
    , 79 (3d Cir. 1990) (holding that the district court
    properly relied upon “the large number of gross exceedances in concluding that
    [the defendant’s] violations were serious”). In the present case, the district
    court began its assessment of this factor by noting that “each of the Events and
    Deviations differ tremendously,” with some of the events being “more serious
    37
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    because they emitted higher quantities of emissions” and “many more” of the
    events being “less serious.” Env’t Tex., 
    66 F. Supp. 3d
    at 908–09. Thus, in
    “considering the amount of emissions,” the district court determined there
    were many more violations that were “not serious or less serious than were
    more serious.” 
    Id. at 909.
    The court then went on to examine whether Exxon’s
    violations “adversely affect[ed] human health or the environment” and
    concluded there was no “credible evidence” that any of the events “even
    potentially” did so. 
    Id. As with
    its analysis of the “duration of the violation”
    factor, we conclude that the district court abused its discretion in using “less
    serious” violations to essentially offset violations of a concededly “more serious”
    nature based on emission quantity alone.
    The CAA instructs a court considering penalties to assess “the
    seriousness of the violation.” 42 U.S.C. § 7413(3)(1). When multiple violations
    are at issue, balancing “more serious” violations against “less serious” ones
    clearly runs contrary to this instruction, with the result being that serious
    violations become less so if accompanied by a sufficient number of insignificant
    violations. In other words, given the district court’s recognition that some of
    the emissions in this case were large enough to be considered “more serious,”
    we think it was an erroneous application of the “seriousness of the violation”
    factor to conclude that the existence of thousands of additional, smaller
    violations somehow tipped the scale against assessment of a penalty. If
    anything, the inclusion of many more violations with the most serious ones
    would only increase the overall degree of seriousness, rather than lessening it.
    See Powell 
    Duffryn, 913 F.2d at 79
    . Thus, in light of the district court’s explicit
    recognition that some of the violations were more serious based on the amount
    of emissions alone, we conclude that it was an abuse of discretion to view this
    38
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    factor as weighing against imposition of a penalty due to the existence of
    thousands of additional, “less serious” violations. 20
    3. Permanent Injunction
    The final point of error asserted by Plaintiffs concerns the district court’s
    refusal to grant a permanent injunction prohibiting Exxon from committing
    further permit violations. “We review a district court’s grant or denial of
    injunctive relief for abuse of discretion.” Aransas Project v. Shaw, 
    775 F.3d 641
    ,
    663 (5th Cir. 2014). “The party seeking a permanent injunction must . . .
    establish (1) success on the merits; (2) that a failure to grant the injunction
    will result in irreparable injury; (3) that said injury outweighs any damage
    that the injunction will cause the opposing party; and (4) that the injunction
    will not disserve the public interest.” VRC LLC v. City of Dallas, 
    460 F.3d 607
    ,
    611 (5th Cir. 2006) (citing Dresser-Rand, Co. v. Virtual Automation, Inc., 
    361 F.3d 831
    , 847–48 (5th Cir. 2004)). The district court in this case denied the
    request for an injunction based on its finding that any injury to the public
    would not outweigh the damage an injunction would cause Exxon. Env’t Tex.,
    
    66 F. Supp. 3d
    at 913. Regarding the injury to the public, the district court
    found that any future unauthorized emissions would not be any “more harmful
    to the public or the environment than past [emissions] were.” 
    Id. With respect
    to the damage to Exxon, the district court found that granting a permanent
    injunction would be “excessively intrusive” because it would “entail continuing
    superintendence of the permit holder’s activities by a federal court.” 
    Id. (quoting Friends
    of the Earth, Inc. v. Laidlaw Envtl. Servs. (TOC), Inc., 
    528 U.S. 167
    , 193 (2000)).
    20 Because the district court acknowledged that for at least some of the emissions
    events, the sheer quantity of pollutants emitted made the violations “more serious,” we do
    not find it necessary to address the other asserted errors raised by Plaintiffs with respect to
    this factor.
    39
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    On appeal, and although their argument is rather cursory, Plaintiffs
    appear to contend that the district court abused its discretion by “rel[ying] on
    [the] clearly erroneous factual finding[]” that imposition of an injunction would
    significantly burden Exxon. See 
    Aransas, 775 F.3d at 663
    (noting that it is an
    abuse of discretion to “rel[y] on clearly erroneous factual findings when
    deciding to grant or deny the permanent injunction”). Plaintiffs argue that
    Exxon “already tracks and reports compliance with its Title V permits” and
    “has immense financial resources which could be devoted to improving
    compliance,” and thus the district court erred in concluding that “even an
    injunction that did no more than require Exxon to prove it is complying with
    its permits” would be excessively burdensome. However, although it may be
    true that Exxon has the resources to comply with any injunction, we do not
    believe that fact alone establishes clear error in the district court’s finding that
    forcing Exxon to continuously prove its compliance with the CAA would be
    “excessively intrusive.” Thus, we conclude that the district court did not abuse
    its discretion in declining to grant a permanent injunction in this case.
    III. CONCLUSION
    In sum, we conclude that the district court erred in its analysis of Exxon’s
    liability under Counts I through IV and abused its discretion in assessing three
    of the CAA’s mandatory penalty factors. We accordingly VACATE the district
    court’s judgment and REMAND for assessment of penalties based on the
    violations that are properly considered “actionable” in light of this opinion. 21
    21  We note that the district court declined to address the applicability of any
    affirmative defenses, as it was unnecessary given the decision not to award penalties.
    Because we vacate that decision, however, we recognize that the district court may well be
    called upon to rule on Exxon’s claimed affirmative defenses on remand. See, e.g., 30 TEX.
    ADMIN. CODE § 101.222(b) (setting forth an affirmative defense for “[n]on-excessive upset
    events”).
    40
    

Document Info

Docket Number: 15-20030

Citation Numbers: 824 F.3d 507

Filed Date: 5/27/2016

Precedential Status: Precedential

Modified Date: 1/12/2023

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