MPM Silicones, LLC v. Union Carbide Corp. ( 2020 )


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  • 17-3468(L)
    MPM Silicones, LLC v. Union Carbide Corp.
    UNITED STATES COURT OF APPEALS
    FOR THE SECOND CIRCUIT
    August Term, 2019
    (Argued: May 8, 2019                         Decided: July 23, 2020
    Amended: August 13, 2020)
    Docket No. 17-3468(L), 17-3669(XAP)
    _____________________________________
    MPM Silicones, LLC,
    Plaintiff-Counter-Defendant-Appellant-Cross-Appellee,
    v.
    Union Carbide Corporation,
    Defendant-Counter-Claimant-Appellee-Cross-Appellant.
    _____________________________________
    Before:
    DENNIS JACOBS, PIERRE N. LEVAL, Circuit Judges. 1
    In cross-appeals from the judgment of the United States District Court
    for the Northern District of New York (Brenda K. Sannes, J.), Plaintiff MPM
    Silicones, LLC (“MPM”) appeals the grant of partial summary judgment
    dismissing its claims for recovery of “remedial action” costs under the
    Comprehensive Environmental Response, Compensation, and Liability Act
    (“CERCLA”) as barred by the statute of limitations in 
    42 U.S.C. § 9613
    (g)(2).
    1Judge Christopher F. Droney, who was originally part of the panel assigned to hear this case,
    retired from the Court effective January 1, 2020. The remaining two members of the panel are
    in agreement regarding this opinion and order. See 
    28 U.S.C. § 46
    (d); 2d Cir. IOP E(b).
    Defendant Union Carbide Corporation (“UCC”) cross-appeals from the district
    court’s holding after a bench trial that UCC is liable to MPM for 95% of the cost
    of future “removal action.” Held, the district court’s conclusion that MPM’s
    claims for recovery of remedial action costs were time-barred relied on an
    incorrect interpretation of our decision in New York State Electric and Gas Corp.
    v. FirstEnergy Corp., 
    766 F.3d 212
     (2d Cir. 2014); the district court made no error
    in adjudicating the allocation of future removal action costs, or in allocating
    95% against UCC. AFFIRMED in part; VACATED and REMANDED in part.
    JONATHAN M. ETTINGER, Foley Hoag
    LLP, Boston, MA, (Jeremy W.
    Meisinger, Foley Hoag LLP, Boston,
    MA, Peter A. Sullivan, Foley Hoag LLP,
    New York, NY, on the brief) for Plaintiff-
    Counter-Defendant-Appellant-Cross-
    Appellee MPM Silicones, LLC.
    HAROLD L. SEGALL, Beveridge &
    Diamond, P.C., Washington, DC, (Karl
    S. Bourdeau, Benjamin E. Apple,
    Beveridge & Diamond, P.C.,
    Washington, DC, Megan R. Brillault,
    Beveridge & Diamond, P.C., New York,
    NY, Edward M. Grauman, Beveridge &
    Diamond, P.C., Austin, TX, on the brief)
    for Defendant-Counter-Claimant-Appellee-
    Cross-Appellant Union Carbide
    Corporation.
    TABLE OF CONTENTS
    A. BACKGROUND ............................................................................................................. 6
    I.     UCC’S USE OF PCBS AT THE SITE ................................................................................ 6
    II.    SUBSEQUENT OWNERSHIP OF THE SITE ...................................................................... 17
    III.   MPM DISCOVERS BURIED PCBS ................................................................................. 21
    IV.    PROCEDURAL HISTORY .............................................................................................. 24
    V.     THE DISTRICT COURT’S JULY 2016 ORDER .................................................................. 27
    2
    VI.        THE DISTRICT COURT’S SEPTEMBER 2017 ORDER ....................................................... 30
    B.         DISCUSSION ................................................................................................................ 33
    I.         STATUTE OF LIMITATIONS .......................................................................................... 33
    a.      UCC’s construction of the earthen cap and the diversion ditch in 1992 were
    remedial........................................................................................................................... 44
    b.      NYSEG’s single-remediation principle was not intended to govern all
    circumstances ................................................................................................................. 47
    II.        FUTURE REMOVAL COSTS .......................................................................................... 67
    a.      Constitutional ripeness ........................................................................................... 69
    b.      Prudential ripeness ................................................................................................. 71
    c.      Future removal cost allocation ............................................................................... 77
    C.         CONCLUSION ............................................................................................................. 81
    JACOBS and LEVAL, Circuit Judges:
    These are cross-appeals by Plaintiff MPM Silicones, LLC (“MPM”) and
    Defendant Union Carbide Corporation (“UCC”) from different aspects of the
    judgment of the United States District Court for the Northern District of New
    York (Brenda J. Sannes, J.). Plaintiff MPM owns and operates the Sistersville
    site (“Sistersville” or the “Site”), a manufacturing facility in Friendly, West
    Virginia. The Site was previously owned and operated by Defendant UCC for
    many decades.
    In the course of UCC’s manufacturing operations at the Site in the 1960s
    and 1970s, UCC generated substantial amounts of toxic polychlorinated
    3
    biphenyl (“PCB”) waste and buried that waste in various areas of the site. After
    MPM acquired the Site, it discovered some of this buried PCB waste and
    undertook a program of clean-up activity in response. MPM brought this suit
    against   UCC     under    the   Comprehensive      Environmental      Response,
    Compensation, and Liability Act (“CERCLA”) to recover from UCC the costs it
    had incurred (and would incur) in cleaning up UCC’s PCB contamination.
    As explained below, with respect to the timeliness of CERCLA suits to
    recover such response costs, the governing statute distinguishes between what
    it identifies as “removal” action, 
    42 U.S.C. § 9601
    (23), which is generally urgent
    action taken to deal, at least temporarily, with an immediate health hazard, and
    “remedial action,” 
    id.
     § 9601(24), which is less urgent action whose objective is
    to eventually achieve a comprehensive, permanent remedy. See New York State
    Elec. and Gas Corp. v. FirstEnergy Corp., 
    766 F.3d 212
    , 230–31 (2d Cir. 2014). The
    timeliness of cost recovery suits is governed by very different standards,
    depending on whether the costs were incurred in “remedial action” or in
    “removal action.” 
    42 U.S.C. § 9613
    (g)(2). In this opinion, we use the terms
    “removal” and “remediation” (or “remedial”) not in their colloquial senses, but
    4
    to refer respectively to the statutory terms “removal action” and “remedial
    action.”
    With respect to MPM’s claims to recover remediation costs, the district
    court granted summary judgment to UCC on the grounds that, under 
    42 U.S.C. § 9613
    (g)(2), the suit was time-barred. MPM Silicones, LLC v. Union Carbide
    Corp., No. 1:11-cv-1542, 
    2016 WL 3962630
    , at *14–19 (N.D.N.Y. July 7, 2016)
    (“MPM I”). On the other hand, as for removal costs, the court held by summary
    judgment that UCC was liable to MPM, 
    id. at *31
    , but that MPM was obligated
    to cover a part of those costs, reserving the precise allocation for trial, MPM
    Silicones, LLC v. Union Carbide Corp., No. 1:11-cv-01542, Dkt. No. 165 (N.D.N.Y.,
    Dec. 8, 2016) (“MPM II”). After a bench trial, the court allocated 95% of future
    removal costs to UCC with 5% to be borne by MPM. MPM Silicones, LLC v.
    Union Carbide Corp., No. 1:11-cv-1542, 
    2017 WL 6408611
    , at *15–21 (N.D.N.Y.
    Sept. 22, 2017) (“MPM III”). MPM and UCC each challenge aspects of those
    rulings on this appeal.
    We hold that the district court relied on invalid reasoning in concluding
    that MPM’s claim for recovery of the costs of its remediation efforts is time-
    barred by 
    42 U.S.C. § 9613
    (g)(2). We therefore vacate that ruling and remand
    5
    for further consideration of the timeliness of MPM’s suit to recover its
    remediation costs. As to costs of future removal, we hold that the district court
    correctly ruled that the issue of cost allocation was ripe for review and did not
    abuse its discretion in allocating responsibility for 95% to UCC.
    A. BACKGROUND
    i.   UCC’s use of PCBs at the Site
    The Site consists of 1,300 acres of land in a rural area bordering the Ohio
    River. The site was undeveloped farmland until UCC acquired it and
    constructed manufacturing facilities. UCC operated those facilities to
    manufacture a variety of chemical products from approximately 1955 to April
    1993. Today, the site is still used for chemical manufacturing and contains
    several facilities for the storage, treatment, and disposal of manufacturing
    waste — known as “Solid Waste Management Units” — including a
    wastewater treatment unit, an active hazardous waste landfill, and two inactive
    waste-disposal areas. These are known as the North Inactive Site and the South
    Inactive Site.
    During its operation of the Site, UCC used hundreds of thousands of
    pounds of polychlorinated biphenyls (“PCBs”) in its manufacturing processes.
    6
    Those processes created substantial PCB-laden chemical wastes. UCC disposed
    of that waste by burning it, or by depositing it into neutralization tanks or lime
    pits at the Site. After the lime pits filled with sludge, UCC drained them and
    dug them out, and used the PCB-laden sludge to backfill other areas of the Site.
    Some of the PCB-laden waste was deposited in the North Inactive Site, a 5.5
    acre landfill located uphill and northwest of the Site’s waste water treatment
    facility and a creek that runs through the Site, known as Sugar Camp Run. See
    Dist. Ct. Dkt. No. 77-1 at 48 (map of the Site); see also Dist. Ct. Dkt. No. 80-17 at
    82–85 (ENVIRON Map of Site). The precise locations of all the backfill areas are
    unknown.
    Figure 1: Partial Map of the Site (Dist. Ct. Dkt. No. 77-1 at 48)
    7
    Figure 2: Partial Map of the Site (Dist. Ct. Dkt. No. 80-17 at 82)
    UCC used PCBs at Sistersville until 1972, when environmental concerns
    regarding PCB toxicity began to emerge. 2 In 1979, after soil sample analysis
    reported the presence of PCBs in Sugar Camp Run, UCC began to investigate
    its past waste disposal practices. Clem Schubert, a UCC employee, was tasked
    with that investigation. Schubert conducted interviews with individuals
    knowledgeable about UCC’s historical waste disposal practices and learned
    about UCC’s practice of disposing of PCB-laden wastes in lime ponds and
    2PCBs are now designated as a “hazardous constituent” under the Resource Conservation
    and Recovery Act (“RCRA”). 40 C.F.R. Pt. 261, App. VIII.
    8
    neutralization tanks, and backfilling areas of the Site with sludge from the lime
    ponds. Schubert identified several areas in the North Inactive Site and several
    locations south of the wastewater treatment plant where he believed UCC had
    dumped PCB wastes and further determined that UCC had shifted around
    previously buried waste during several construction projects. Schubert
    summarized his findings in a January 1980 memorandum, in which he stated
    that “it is reasonable to conclude that in the area of the Sistersville Plant site
    there are buried . . . heavies with up to 250,000 pounds of PCB[s].” Dist. Ct. Dkt.
    238 at 71. That memorandum was circulated to UCC employees, including
    UCC’s Plant Manager.
    UCC conducted several rounds of testing for various contaminants
    (including PCBs) at the Site between 1979 and 1981. While some tests showed
    low levels of PCBs in groundwater, the results overall were inconsistent and
    revealed only small amounts of PCBs. 3 In 1984, a UCC memorandum
    3For example, a June 1979 potable water test revealed 10 parts per billion (“ppb”) of PCBs in
    the water at the Site. UCC retested the water in the following month, found no PCBs, and
    concluded that the presence of PCBs in the June 1979 sample was a result of laboratory
    contamination. One test in March 1980 detected PCBs in a well near the North Inactive Site,
    but further tests in the same location performed a year later did not detect PCBs.
    9
    regarding contamination at the North Inactive Site recognized that “[a]lthough
    no definitive evidence can be found, it is possible that up to 250,000 pounds of
    PCB[s] are buried at this site . . . However, wells at this site when last monitored
    in 1981 showed no significant leaching or contamination and no PCB[s] were
    found.” Dist. Ct. Dkt. 78–10 at 1. A 1992 memorandum summarizing all prior
    UCC investigations into PCBs at the Site — including Schubert’s 1980
    memorandum — concluded that “it is not possible to state unequivocally that
    PCB[s] were not placed in the north inactive site” but that “[i]nformation
    suggesting disposal is purely speculative” because “[m]onitoring data to date
    do not substantiate the speculation.” App’x 382–83. At various times during
    the 1980s and 1990s, UCC employees speculated that the low levels of PCBs
    detected by UCC’s site monitoring tests were the result of spillage from PCB-
    containing electrical equipment that UCC had used at the site.
    In 1981, as required by the recently enacted Resource Conservation and
    Recovery Act (“RCRA”), see 
    42 U.S.C. §§ 6901
    –6992k, UCC submitted an
    application to the Environmental Protection Agency (“EPA”) for a permit to
    treat, store, or destroy hazardous waste. RCRA established a framework to
    “ensure the proper treatment, storage, and disposal of [hazardous] waste.”
    10
    Prisco v. A&D Carting Corp., 
    168 F.3d 593
    , 608 (2d Cir. 1999) (citation omitted).
    It requires the owner or operator of any “facility that treats, stores, or disposes
    of hazardous wastes” to “seek[] and obtain[] a permit from the [EPA].” Owen
    Elec. Steel Co. of S.C., Inc. v. Browner, 
    37 F.3d 146
    , 147 (4th Cir. 1994); see also 
    42 U.S.C. § 6925
    (a). The statute requires the EPA to evaluate the environmental
    risks of any such facility and to issue permits requiring the owner or operator
    of a facility to undertake “corrective action for all releases of hazardous waste
    . . . from any solid waste management unit.” 
    42 U.S.C. § 6924
    (u).
    UCC’s permit application required its disclosure of any “hazardous
    substances” that had been “stored, treated, or disposed of” at the Site. See
    Hazardous Substances: Notification of Treatment, Storage and Disposal
    Facilities, 
    46 Fed. Reg. 22144
    , 22145 (Apr. 15, 1981); see also 
    42 U.S.C. § 9603
    (c)
    (requiring disclosure of certain facility owners of the “stor[age], treat[ment], or
    dispo[sal]” of any “hazardous substances”). 4 While UCC indicated on the
    4EPA regulations at the time did not require UCC to disclose any information regarding
    PCBs. This was because PCBs were then “not included within the RCRA definitions of
    hazardous waste” as they were regulated under a different statutory framework. See
    Hazardous Substances: Notification of Treatment, Storage and Disposal Facilities, 
    46 Fed. Reg. 22144
    , 22145 (Apr. 15, 1981) (making disclosure of PCB contamination voluntary).
    11
    application that it was aware of several types of hazardous waste at the Site, it
    did not disclose its prior use of PCBs, leaving a check box for “PCBs”
    unchecked. 5
    In its written correspondence with the EPA regarding its RCRA permit
    for Sistersville, UCC made no mention of its prior use of PCBs or its dumping
    of PCB-laden waste. In response to the EPA’s 1985 request for information
    about all solid waste management units at the Site that had “the potential to
    release hazardous wastes or hazardous constituents to the environment,” Sp.
    App’x 87, UCC disclosed general information about some potential
    contaminants at the North and South Inactive Sites but did not mention PCBs. 6
    5 Fred Dailey, a long-time UCC employee, indicated in a 1981 memorandum to other UCC
    employees that he had advised the EPA representatives that UCC had manufactured
    chemicals that could have produced PCB waste from 1956 to 1962, but that UCC’s “experts
    [felt] that [UCC] did not make any PCBs.” Sp. App’x 86. Moreover, Dailey indicated that he
    told the EPA representatives that UCC used electrical equipment at Sistersville that contained
    PCBs.
    In 1987, Dailey wrote to UCC’s legal counsel Carol Dudnick, asking Dudnick whether UCC
    should revise one of its EPA submissions — the “Notification of Hazardous Waste” form —
    to disclose the possibility that UCC had dumped PCB-laden waste at the inactive disposal
    sites at Sistersville. Dudnick advised Dailey that it was unnecessary to add PCBs to the form
    because the information on PCB contamination was “speculative at best,” because there was
    no documentation that anyone at UCC had actual knowledge of PCB disposal at the site, and
    because UCC’s monitoring and testing had not detected any PCBs. 
    Id. at 89
    .
    6UCC’s response to the EPA recounted a list of waste components that was roughly identical
    to the list of waste contaminants Schubert had listed in his 1980 memo, but conspicuously
    12
    In response to the EPA’s 1986 further request for information regarding the
    solid waste management units, UCC disclosed the results of its site testing,
    which showed that, if any PCBs were present in the tested samples, that
    presence was below detection limits. UCC did not communicate its history of
    PCB use and disposal at Sistersville.
    EPA representatives visited the Site on May 15, 1986, and while the
    parties dispute what happened during that visit, Fred Dailey, a UCC employee,
    wrote a memorandum in 1987 — one year after the visit — stating that, during
    the visit, he informed the EPA orally that “it was speculated that as much as
    500,000 lbs of contaminated PCB heat fluid was generated during the plant’s
    previous activities,” that “its disposition was never determined,” and that “it
    could have been placed in an inactive site.” Sp. App’x 88. Dailey’s memo then
    stated that he told the EPA representatives that UCC had conducted
    groundwater testing and examination of the inactive sites at Sistersville, and
    that “[a]ll the results of the tests and analyses conducted showed no PCBs.” 
    Id.
    deleted from that list Schubert’s conclusion that the site contained “heavies with up to 250,000
    pounds of PCB[s].” Sp. App’x 87–88.
    13
    According to Dailey’s 1987 memorandum, the EPA representatives did not
    further inquire about PCBs during the meeting.
    In 1988, the West Virginia Division of Natural Resources (“WVDNR”) —
    which was authorized by the EPA to administer certain provisions of RCRA —
    issued UCC a permit covering Sistersville’s active hazardous waste
    management units. That permit included a “Remedial Action Plan” requiring
    UCC to treat the groundwater near a copper sludge removal pond at
    Sistersville. In 1991, UCC installed a recovery well, which was part of a larger
    project to close the sludge pond.
    Also in 1988, the EPA issued a RCRA permit to UCC for Sistersville. The
    EPA determined that eight of the solid waste management units at the Site —
    including the North Inactive Site and the wastewater treatment system —
    required further investigation and required UCC to submit a workplan to
    remediate hazardous waste issues at each unit. The EPA’s RCRA permit did
    not mention PCBs. UCC submitted a workplan for the North Inactive Site in
    1992, which concluded that the area was a source of contamination and
    recommended construction of an earthen cap to reduce surface water,
    sediment, and groundwater contamination. UCC’s 1992 submission to the EPA
    14
    did not mention PCBs because of what UCC later referred to as “an inadvertent
    failure to perform PCB analysis.” Dist. Ct. Dkt. 89-1 at 25 ¶ 62. The EPA
    accepted UCC’s proposal, and UCC undertook construction of the earthen cap
    in the summer and fall of 1992. 7 The same year, UCC also constructed a
    diversion ditch to intercept surface water from the hillside and divert it away
    from the disposal area. In 1993, UCC wrote a letter to the EPA advising that it
    inadvertently failed to disclose PCBs in its 1992 report and disclosing sampling
    results from Sugar Camp Run showing low levels of PCBs. The EPA did not
    require any further action in response to this additional disclosure.
    None of the corrective actions undertaken by UCC were designed to
    investigate or address the possibility that large amounts of PCB-laden wastes
    were buried at Sistersville. Instead, the construction of the earthen cap and the
    diversion ditch for the North Inactive Site were designed to address the
    presence of other contaminants in groundwater and soil in various parts of the
    north end of the Site — contaminants UCC believed to have originated at the
    7UCC’s corrective actions taken during 1992 also included an effort to stabilize the banks of
    Sugar Camp Run and to build new fencing to prevent erosion of the creek.
    15
    North Inactive Site. 8 As more recent events make clear, a full investigation into
    UCC’s historical PCB waste dumping would have required a comprehensive
    sampling program in the vicinity of the North Inactive Site and other potential
    dumping sites and in Sugar Camp Run. UCC did not conduct such a study, nor
    did the EPA require it to. 9 Documents produced in the 1980s and 1990s show
    that UCC’s position was that any PCBs found during site monitoring were
    likely the result of spillage from its PCB-containing electrical equipment. UCC
    removed all PCB-containing electrical equipment from the Site by mid-1991,
    and subsequently declared that the Site had attained “PCB ‘free’ status.” Sp.
    App’x 90.
    8The 1992 RCRA Facility Investigation Report for the North Inactive Site lists various
    chemicals in groundwater and sediment samples that were believed to have originated in the
    North Inactive Site, including zinc and copper.
    9 The parties disagree as to whether the EPA would have required UCC to undertake
    corrective action to remediate the PCB contamination at the Site had UCC been more
    forthcoming about its historical PCB use and disposal. UCC argues that it disclosed its past
    practices, pointing to Dailey’s notes regarding the 1986 site visit. MPM argues that Dailey’s
    notes are “self-serving” and that UCC intentionally concealed its past practices from
    regulators (and, by extension, from subsequent owners) by failing to disclose them in its
    written correspondence with the EPA, and assumes that the EPA would have required
    corrective action had it known the full history of PCB use at the site. Notably, however, after
    MPM discovered PCB-contaminated soil in 2008, uncovered UCC records revealing the full
    extent of UCC’s historical PCB use, and disclosed its findings to federal and state regulators
    in 2012, neither EPA nor WVDEP has yet required any further corrective action.
    16
    ii.    Subsequent ownership of the Site
    In 1993, UCC entered into an agreement to sell the Site to OSi Specialties,
    Inc. (“OSi”). Prior to closing, OSi retained Environment Strategies Corporation
    (“ESC”) to conduct environmental due diligence. ESC requested information
    from UCC about materials disposed of at the North Inactive Site, and UCC
    directed ESC to the 1992 workplan it had submitted to the EPA, which
    purported to detail the known contaminants at the site. ESC issued a report
    which included five paragraphs on PCBs, three of which address PCB-
    containing electrical equipment. The other two paragraphs discuss soil samples
    collected in 1992 and 1993 which showed the presence of PCBs, but not at a
    level requiring remediation under EPA guidelines.
    After the sale, the RCRA permit for the Site transferred to OSi. In 1994,
    OSi submitted to the EPA a Corrective Measures/Stabilization Proposal for the
    North Inactive Site, which summarized the corrective actions that had
    previously been taken to control surface water infiltration and runoff from the
    North Inactive Site — including the earthen cap and diversion ditch UCC had
    built in 1992 — and proposing the construction of an interceptor trench to
    divert water away from the North Inactive Site and continued monitoring and
    17
    maintenance of the site. EPA approved the proposal in June 1994, and OSi
    constructed the interceptor trench in the fall of 1994. In 1997, EPA modified the
    Site’s permits to recognize that it was satisfied with the measures being taken
    to remedy contamination at the North Inactive Site and to require continued
    inspection and maintenance of the earthen cap and the diversion ditches.
    In 2003, OSi, which had become Crompton Corporation, sold the Site to
    an affiliate of General Electric, Inc., (“GE”), then named GE Advanced
    Materials, which would later become Plaintiff MPM Silicones. The purchase
    agreement included indemnity provisions relating to environmental
    contamination at the Site. Prior to the sale to GE, OSi/Crompton again retained
    ESC to perform an environmental site assessment. After conducting site visits
    and interviews, ESC issued a report stating that the Site had obtained “PCB
    free” status following the removal of all PCB-containing electrical equipment
    in 1991. Sp. App’x 93. The report also acknowledged a previous UCC memo
    recognizing the possibility that PCBs had been disposed of at the North
    Inactive Site but noting that UCC’s site monitoring could not substantiate the
    existence of buried PCB wastes.
    18
    GE hired ENVIRON, an environmental consulting firm, to conduct a
    review of the site prior to the sale. John Wood, a GE employee who supervised
    ENVIRON’s environmental due diligence, testified (at his deposition during
    the proceedings in the district court) that UCC employees told him about the
    investigation in the 1980s that had raised the possibility of PCB disposal at the
    site, but had assured him that UCC’s site monitoring could not substantiate
    that theory. Wood also testified that UCC employees had told him that UCC
    had used PCB-containing electrical equipment at the Site — which had since
    been removed — and that they believed that “the source of PCBs . . . found at
    the site was leaks from or maintenance [of that electrical equipment].” Dist. Ct.
    Dkt. 89-9 at 5–6. Wood further testified that UCC did not reveal “anything in
    [the] documents or [the] interview process that would have led [GE] to know
    that PCBs were used in the manufacturing process,” and that, had he and his
    team known about this history, they would have “tailored the investigation
    and sampling program in a way that we would have collected more samples,
    specifically trying to address that issue or that area of concern.” 
    Id.
    ENVIRON conducted extensive soil and groundwater testing at the Site
    in May 2003. ENVIRON’s final report, issued in May 2004 (after the sale of the
    19
    property closed in July 2003), noted that PCBs had been found in
    concentrations exceeding federal regulatory thresholds in groundwater and
    soil samples from various areas in the north end of Sistersville — including
    Sugar Camp Run — and that these positive PCB results were “unexpected.”
    Dist. Ct. Dkt. 80–17 at 74. 10 The report explained that prior reports of PCB-laden
    waste dumping at the Site had been dismissed based on a 1992 UCC
    memorandum determining — without explanation — that positive PCB results
    had been “determined not to be valid,” and based on statements from UCC
    representatives that UCC’s “distillation process would not produce PCBs.” 
    Id.
    at 11–12. The report, however, further stated:
    Although Facility representatives are no longer concerned about
    PCBs in the North Inactive Area, unexpected levels of PCBs were
    found in some Facility soils and selected ground water samples
    during the Phase II investigation. As there is no obvious source for
    these PCBs, resampling of ground water, and further investigation
    of soil, is suggested.
    10PCBs were detected above regulatory levels in soil samples from certain hazardous waste
    storage areas, and in the facility’s waste incineration area at the north end of the site, leading
    ENVIRON to conclude that “further evaluation of this area is required to identify options of
    remediation.” Dist. Ct. Dkt. 80-17 at 40–43. PCBs were also detected in Sugar Camp Run
    sediments in varying concentrations, with “concentrations increas[ing] in the downstream
    direction.” 
    Id. at 48
    . PCBs were also detected above regulatory thresholds in groundwater
    from the site’s “Environmental Protection Area” in the north end of the site, and in the site’s
    “Fly Ash Disposal Area,” also in the north end of the site “just north of Sugar Camp Run.” 
    Id.
    at 45–46, 48–50.
    20
    Id.; see also 
    id. at 74
    . In July 2004, GE Advanced Materials sent the May
    2004 ENVIRON report to OSi/Crompton and asserted that under the indemnity
    provisions in the purchase agreement OSi/Crompton was responsible for the
    costs associated with the necessary investigation and remediation of PCBs at
    the Site. OSi/Crompton disclaimed financial responsibility, but nonetheless
    engaged ESC to investigate PCB contamination in two areas of the Site: the
    Waste Incineration Area and the Permitted Hazardous Storage Waste Area —
    both of which are in close proximity to the North Inactive Site. ESC issued a
    final report on May 30, 2006, concluding that PCB levels in certain areas of the
    site exceeded federal regulatory levels, and recommended “a second phase of
    soil characterization to delineate the vertical and horizontal extent of PCBs in
    soil” in this area. Dist. Ct. Dkt. 80-7 at 13. On August 28, 2007, WSP
    Environmental Strategies delivered a plan for additional sampling, which GE
    Advanced Materials (now named MPM Silicones, LLC) did not implement.
    iii.   MPM discovers buried PCBs
    In June 2008, during construction of a project to upgrade the site’s
    wastewater treatment unit, MPM uncovered discolored soils which, when
    21
    analyzed, were revealed to be contaminated with PCBs. MPM suspended its
    construction project and spent $123,195.05 in response to its discovery. This
    included $30,385.18 disposing of the contaminated materials it had uncovered;
    $8,714.71 decontaminating rented construction equipment; and $84,095.16 on
    steel shoring it needed to prevent the excavated area from caving in.
    In August 2008, MPM contacted OSi/Crompton (then known as
    Chemtura) informing it of the recently discovered contamination and again
    asserting that OSi/Crompton was responsible for the costs of remediation.
    OSi/Crompton again disclaimed responsibility under the indemnity provisions
    of the purchase agreement. In June 2009, MPM hired Clean Harbors, an
    environmental consulting firm, to conduct further sampling in the wastewater
    treatment unit area. Clean Harbors uncovered additional contamination and
    reported that it could not yet determine the geographical extent of the
    contamination. MPM incurred costs of $251,345.20 in connection with Clean
    Harbors’ sampling activities, bringing its total outlays in response to its
    discovery of PCBs to $374,540.25. After receiving the results from Clean
    Harbors, MPM searched the Site’s records and found UCC documents dating
    22
    back to 1970 that indicated that UCC had purchased and used “significant
    quantities” of PCBs at the Site. Sp. App’x 105.
    MPM has not conducted any further soil sampling or any further
    construction work on its construction of the wastewater treatment upgrade
    since Clean Harbor concluded its sampling in September 2009. MPM, however,
    plans to resume the wastewater treatment upgrade by installing a pump station
    in the location where it encountered PCBs in 2008, which will require MPM to
    excavate and dispose of the PCB-containing soils.
    MPM contacted UCC regarding the PCB contamination in September
    2010, and the parties entered into a tolling agreement which tolled the statute
    of limitations from May 19, 2011 to December 30, 2011. MPM reported its
    discovery of the PCB contamination to the West Virginia Department of
    Environmental Protection (“WVDEP”) in March 2012. As of September 2017,
    neither WVDEP nor the EPA had required any further remediation of the PCB
    contamination. 11
    11MPM has prepared a soil management plan in anticipation of its excavation of the area
    around the wastewater treatment plant, which WVDEP has approved for “advance[ment] to
    the final stage.” Sp. App’x 107.
    23
    iv.     Procedural History
    MPM filed this suit on December 30, 2011 seeking, inter alia,
    reimbursement under CERCLA from UCC for $374,540.25 in past cleanup
    costs, and a declaratory judgment of UCC’s liability for any future cleanup
    costs required to deal with contamination at Sistersville. 12 UCC brought
    crossclaims seeking contribution under CERCLA, arguing that MPM should
    bear a portion of the response costs. 13
    Like RCRA, CERCLA was enacted to “address the risks associated with
    the improper storage and disposal of hazardous and toxic substances.” Schaefer
    v. Town of Victor, 
    457 F.3d 188
    , 190 (2d Cir. 2006). CERCLA’s “dual goals [are]
    cleaning up hazardous waste and holding polluters responsible for their
    actions.” New York v. Next Millennium Realty, LLC, 
    732 F.3d 117
    , 124 (2d Cir.
    12MPM brought CERCLA claims against UCC for recovery of costs under Section 107 and for
    declaratory relief as to future costs under Section 113(g)(2), and further asserted state law
    claims of negligence, strict liability, and restitution.
    13UCC asserted counterclaims for contribution under Section 113(f)(1) of CERCLA and
    declaratory relief under Section 113(g)(2) of CERCLA and the Declaratory Judgment Act, 
    28 U.S.C. § 2201
    .
    24
    2013). 14 Among other measures, CERCLA “authoriz[es] private parties to
    pursue contribution or indemnification from potentially responsible parties for
    expenses incurred responding to environmental threats.” Commander Oil Corp.
    v. Barlo Equip. Corp., 
    215 F.3d 321
    , 326 (2d Cir. 2000). 15 Section 107(a) of
    CERCLA provides a cause of action for private parties to seek recovery of costs
    from a “potentially responsible party” 16 of “any [] necessary costs of response”
    to a release of hazardous substances. Schaefer, 457 F.3d at 195; see also 
    42 U.S.C. § 9607
    (a). Section 113(g)(2) permits a party to seek a declaratory judgment on a
    potentially responsible party’s liability for any necessary future response costs.
    14See also H.R. Rep. No. 99–253 (III), 99th Cong., 1st Sess. 1985, reprinted in 1986 U.S.C.C.A.N.
    3038, 3038 (“CERCLA has two goals: (1) to provide for clean-up if a hazardous substance is
    release into the environment or if such release is threatened, and (2) to hold responsible
    parties liable for the costs of these clean-ups.”).
    15 CERCLA also provides that the federal government “may clean up a contaminated area
    itself” and then “recover its remediation expenses directly from parties responsible for [the]
    pollution.” Schaefer, 457 F.3d at 194–95 (citations omitted); see also State of N.Y. v. Shore Realty
    Corp., 
    759 F.2d 1032
    , 1041 (2d Cir. 1985) (“CERCLA authorizes the federal government to . . .
    use Superfund resources to clean up hazardous waste sites and spills . . . [and to] sue for
    reimbursement of cleanup costs from any responsible parties it can locate, allowing the
    federal government to respond immediately while later trying to shift financial responsibility
    to others.”).
    16Section 107(a) of CERCLA enumerates four classes of potentially responsible parties
    (“PRPs”): “(1) owners of facilities with hazardous substances; (2) former owners of facilities
    with hazardous substances; (3) generators of hazardous substances; and (4) transporters of
    hazardous substances.” Schaefer, 457 F.3d at 195 (citing 
    42 U.S.C. § 9607
    (a)(1)–(4)).
    25
    
    42 U.S.C. § 9613
    (g)(2). Section 113(f)(1) permits a party which has been sued for
    cost reimbursement under Section 107 of CERCLA to sue other potentially
    responsible parties for contribution. See 
    id.
     § 9613(f)(1); see also Cooper Indus.,
    Inc. v. Aviall Servs., Inc., 
    543 U.S. 157
    , 162–63 (2004).
    CERCLA’s cost-recovery provision distinguishes between two kinds of
    response projects. “Remedial actions” are “generally long-term or permanent
    containment or disposal programs,” State of New York v. Shore Realty Corp., 
    759 F.2d 1032
    , 1040 (2d Cir. 1985), which are taken “in the event of a release or
    threatened release of a hazardous substance into the environment” and are
    “consistent with [a] permanent remedy.” 
    42 U.S.C. § 9601
    (24) (defining
    “remedy” or “remedial action”). “Removal actions,” by contrast, are “typically
    short-term cleanup arrangements,” Shore Realty, 
    759 F.2d at 1040
    , which
    respond to immediate threats to the environment. 
    42 U.S.C. § 9601
    (23) (defining
    “removal”); New York State Elec. and Gas Corp. v. FirstEnergy Corp., 
    766 F.3d 212
    ,
    230 (2d Cir. 2014) (“NYSEG”) (“Removal actions are generally clean-up
    measures taken in response to immediate threats to public health and safety.”).
    Section 113(g)(2) of CERCLA provides different statutes of limitations for
    lawsuits brought to recover costs for removals and remediations. See 42 U.S.C.
    26
    § 9613(g)(2). A cost recovery suit for a removal must be brought “within 3 years
    after completion of the removal action,” while a cost recovery suit for a
    remediation must be brought “within 6 years after initiation of physical on-site
    construction of the remedial action.” Id.
    The parties cross-moved for summary judgment. UCC argued, inter alia,
    that MPM’s Section 107 claim for reimbursement of past remediation costs (and
    its Section 113(g)(2) claim for a declaratory judgment on UCC’s liability for
    future remediation costs) were time-barred because previous corrective actions
    taken at Sistersville — specifically, UCC’s installation of a recovery well in 1991
    and its construction of the earthen cap and diversion ditch in 1992, and
    OSi/Crompton’s construction of the interceptor trench in 1994 — were
    remediations, so that the commencement of construction of these measures in
    the early 1990s triggered the six-year statute of limitations for remediations.
    v.     The district court’s July 2016 order
    The district court’s July 7, 2016 order concluded that UCC’s actions in
    the early 1990s (and OSi’s construction of the interceptor trench in 1994) were
    remediation (rather than removal), based in part on the fact that the EPA had
    incorporated these measures into the “final remedy” for dealing with
    27
    contamination at Sistersville. See MPM I, 
    2016 WL 3962630
    , at *11–14. (MPM
    challenges this conclusion on appeal, arguing that “UCC’s activities were more
    analogous to removal action than to remedial action.” MPM Br. at 46–50.)
    The district court further found that MPM’s claims for reimbursement of
    costs of its past remediations (under Section 107(a)) and its request for a
    declaratory judgment on UCC’s liability for future remediation costs (under
    Section 113(g)(2)) were time-barred. MPM I, 
    2016 WL 3962630
    , at *14–19. In so
    holding, the district court relied on a statement in our decision in NYSEG that
    “there can only be one remedial action at any given site.” 766 F.3d at 235. The
    district court characterized the multiple remediation projects — i.e., (i) UCC
    and OSi’s corrective actions in the early-1990s, (ii) any efforts undertaken by
    MPM to dispose of the PCB-contaminated soil in 2008 that were remedial in
    nature, and (iii) any future remediation efforts MPM would undertake to
    decontaminate the Site — as part of the Site’s single remediation and held that
    “the statute of limitations [to recover costs for that remediation] began to run
    when [UCC] commenced physical on-site construction of the remedial action
    [in the early 1990s].” MPM I, 
    2016 WL 3962630
    , at *14. Because the six-year
    statute of limitations began to run in the early-1990s, the court held that the
    28
    limitations “had expired long before the parties’ May 19, 2011 tolling
    agreement,” and that MPM’s claims were time-barred under Section
    113(g)(2)(B). 
    Id. 17
     (MPM’s principal argument on appeal is that the district court
    erred in holding that these claims were barred by the statute of limitations.)
    On that basis, the district court granted UCC’s motion for summary
    judgment to the extent that MPM’s claims sought recovery of costs related to
    any remediation at the Site. 
    Id. at *35
    . The district court, however, held that UCC
    was liable as a matter of law for past and future costs of removal that MPM had
    undertaken or would undertake at Sistersville. 
    Id.
     18 Accordingly, the court
    17The court rejected MPM’s attempt to distinguish NYSEG on the ground that a prior owner’s
    actions could not trigger the statute of limitations for a claim brought by a subsequent owner,
    holding that, while there was no precedent “in which one party’s initiation of construction of
    the remedial action triggered the statute of limitations for another party,” MPM’s argument
    was foreclosed by the statutory text and our decision in NYSEG. MPM I, 
    2016 WL 3962630
    , at
    *14–17.
    The court further rejected MPM’s argument that the statute of limitations should be tolled
    under the doctrine of equitable tolling, holding that “MPM has failed to present evidence
    showing that it has pursued its rights diligently” because MPM had failed to take action after
    receiving the May 2004 ENVIRON report recommending further testing for PCBs at the site.
    
    Id.
     at *17–19. (MPM challenges each of these conclusions on appeal. MPM Br. at 16–45.)
    18The district court found that at least some of MPM’s response costs were “necessary” and
    “consistent with the national contingency plan,” as required for cost recovery under Section
    107(a)(4)(B). MPM I, 
    2016 WL 3962630
    , at *20–25. Further, the district court rejected the
    argument that UCC was not liable for any future response costs associated with an area of
    the Site referred to as Landfill No. 2 because that landfill was a separate “facility,” holding
    that Landfill No. 2 and the other solid waste management units at the site “constitute one
    29
    entered a declaratory judgment as to UCC’s liability for the costs of future
    “removal actions” at Sistersville. 
    Id. at *31
    . 19 In a later order, the district court
    granted UCC’s motion for summary judgment that MPM was liable under
    Section 113(f)(1) in contribution for an equitable share of the response costs —
    leaving open the issue of cost allocation between MPM and UCC. 20 The parties
    subsequently reached a settlement of MPM’s claim for past removal costs. After
    the settlement, the only remaining issue was the allocation of financial
    responsibility for any future removal costs.
    vi.    The district court’s September 2017 order
    CERCLA facility.” 
    Id.
     at *25–27. (Neither of these conclusions are disputed by the parties on
    appeal.)
    19The district court held that MPM’s state-law strict liability and negligence claims are barred
    by the applicable statute of limitations and declined to grant UCC’s motion for summary
    judgment on MPM’s restitution claim and its claim for a declaratory judgment as to
    restitution. See MPM I, 
    2016 WL 3962630
    , at *32–35. (Neither of these conclusions are disputed
    on appeal.). The parties later stipulated to the dismissal of MPM’s restitution claim. Dist. Ct.
    Dkt. No. 202.
    20 In its July 7, 2016 order, the district court had denied UCC’s motion for summary judgment
    on its counterclaim under Section 113(f)(1) of CERCLA seeking contribution from MPM of
    past removal costs — and its counterclaim seeking a declaratory judgment on MPM’s liability
    for any future removal costs — after finding that MPM raised a triable issue of fact regarding
    its bona fide prospective purchaser defense. See MPM I, 
    2016 WL 3962630
    , at *27–31; 
    42 U.S.C. § 9607
    (r)(1) (limiting liability for “bona fide prospective purchaser[s]”); 
    id.
     § 9601(40)
    (defining “bona fide prospective purchaser”). The district court revisited the issue in a
    December 8, 2016 oral order granting summary judgment to UCC on the issue of MPM’s
    liability for contribution. See MPM II, No. 1:11-cv-1542, Dkt. No. 165.
    30
    From January 31, 2017 to February 2, 2017, the district court held a bench
    trial on the remaining issues: (a) whether future response costs should be
    allocated and (b) what the parties’ equitable shares of those response costs
    should be. In a September 22, 2017 order, the district court held that the issue
    of allocation of costs was ripe for adjudication because MPM had established
    that “it is likely to incur future costs in responding to PCBs at the Site because
    MPM plans to upgrade its wastewater treatment facilities” which will require
    that “MPM respond appropriately to PCBs in the soils.” MPM III, 
    2017 WL 6408611
    , at *15–18. UCC argues on appeal that the district court erred in so
    holding because the possibility of MPM incurring future removal costs is too
    remote.
    In considering how to allocate future removal costs, the district court
    noted that “UCC was the only entity to bring PCBs onto the Site” and
    “benefitted from disposal of the [PCB] waste” without having to engage in any
    corrective action (factors which weighed in favor of allocating costs to UCC),
    but concluded that there was insufficient evidence to conclude that “UCC’s
    failure to disclose PCBs [to regulators] was driven by an intention to conceal
    information.” MPM III, 
    2017 WL 6408611
    , at *19. The court also rejected UCC’s
    31
    argument that MPM should bear a majority of future removal costs because
    MPM “had notice of the PCBs and assumed the risk of future PCB-related
    response costs when it acquired the Site,” instead crediting Wood’s testimony
    that, during the due diligence process, UCC employees led him to believe that
    “any PCB contamination was due to PCB electrical equipment.” 
    Id. at *20
    .
    Further, the court rejected UCC’s argument that the indemnity agreement
    between MPM and Crompton warranted allocating responsibility to MPM,
    finding that “MPM has not been indemnified, nor is there any reason to
    conclude that it will be” because “Crompton has disclaimed responsibility
    under the indemnity agreement.” 
    Id. at *21
    . The court also rejected the
    argument that MPM should bear the majority of the responsibility because it
    would “derive commercial benefit from any future removal action when it
    upgrades the wastewater treatment unit,” holding that “there is no evidence
    that MPM would realize a meaningful increase in property value as a result of
    a PCB cleanup.” 
    Id.
    The court, however, faulted MPM for failing to contact government
    regulators after discovering PCB-contaminated soil in 2008, and for waiting
    until 2012 to inform WVDEP of this development, noting that the Site’s RCRA
    32
    permit required MPM to notify regulators of any “relevant facts” regarding
    newly-discovered contamination within seven days of discovery. 
    Id.
     at *20–21.
    Accordingly, the court allocated five percent of future removal costs to MPM
    and allocated the remaining ninety-five percent of future removal costs to
    UCC. 
    Id. at *1
    . 21 (On appeal, UCC argues that the district court abused its
    discretion in weighing the relevant allocation factors, and that the district court
    should have allocated more of the cost burden to MPM.)
    B. DISCUSSION
    MPM argues in this appeal that the district court erred in concluding that
    MPM’s claims for reimbursement of remediation costs are time-barred by §
    113(g)(2)(B). UCC contends that the district court erred in determining that
    future allocation of removal costs was ripe for review, and further erred in
    allocating 95% of those costs against it.
    i.     Statute of Limitations
    21Because of its prior order holding MPM’s claim for reimbursement of costs for “remedial
    actions” to be time-barred, the district court did not allocate costs related to any future
    remedial actions.
    33
    MPM directs its arguments against two aspects of the district court’s
    finding of untimeliness: (1) the court’s conclusion that UCC’s prior response
    projects in the 1990s were in the nature of remediation, rather than removal;
    and (2) its conclusion that, if UCC’s prior response projects constituted
    remediation, the six years allowed by § 113(g)(2)(B) for recovery of the costs of
    any further remediation at the Site began to run upon UCC’s initiation of its
    remediation in 1992 and expired in 1998, long before MPM purchased the Site.
    The district court reached the latter conclusion based on its understanding of
    our NYSEG opinion to mean that, once any remediation is undertaken at a site,
    all future remedial activity at the site, regardless of circumstances, is deemed
    to be part of the same initial remediation, so that, under § 113(g)(2)(B), the
    opportunity for timely suit to recover the costs of future remediation at the site
    necessarily expires, absent tolling, six years from the start of the initial
    remediation.
    We agree with the district court that UCC’s corrective actions
    undertaken in the 1990s were remediation, but we do not understand NYSEG
    to mean that, for purposes of determining the timeliness of a cost recovery
    action, all remediation activity at a site regardless of circumstances is deemed
    34
    to be part of a single remediation, so that the six year limitations period
    necessarily begins to run at the start of the first remedial activity. Accordingly,
    we believe the district court’s conclusion that MPM’s suit was untimely was
    based on an inaccurate premise. We do not decide whether MPM’s suit to
    recovery remediation costs was in fact timely, but instead vacate the district
    court’s decision and remand for reconsideration consistent with this opinion.
    The distinction between “removal” actions and “remedial action[s]”
    arises from the first iteration of the CERCLA statute enacted in 1980. See Pub.
    L. 96–510, § 101(a)(23)–(24); 
    94 Stat. 2767
    , 2770–71 (1980) (defining “remove” or
    “removal” and “remedy” or “remedial action”). The statute defines “remove”
    or “removal” as:
    the cleanup or removal of released hazardous substances from the
    environment, such actions as may be necessary [] in the event of
    the threat of release of hazardous substances into the environment,
    such actions as may be necessary to monitor, assess, and evaluate
    the release or threat of release of hazardous substances, the
    disposal of removed material, or the taking of such other actions
    as may be necessary to prevent, minimize, or mitigate damages to
    the public health or welfare or to the environment, which may
    otherwise result from a release or threat of release.
    Further, the statute provides several examples of “removal” actions,
    including:
    35
    security fencing or other measures to limit access, provision of
    alternative water supplies, temporary evacuation and housing of
    threatened individuals not otherwise provided for.
    
    42 U.S.C. § 9601
    (23).
    The statute defines “remedy” or “remedial action” as:
    those actions consistent with permanent remedy taken instead of
    or in addition to removal actions in the event of a release or
    threatened release of a hazardous substance into the environment,
    to prevent or minimize the release of hazardous substances so that
    they do not migrate to cause substantial danger to present or
    future public health or welfare or the environment.
    The statute also provides an illustrative list of “remedial action[s],”
    including:
    such actions at the location of the release as storage, confinement,
    perimeter protection using dikes, trenches, or ditches, clay cover,
    neutralization, cleanup of released hazardous substances and
    associated contaminated materials, recycling or reuse, diversion,
    destruction, segregation of reactive wastes, dredging or
    excavations, repair or replacement of leaking containers, collection
    of leachate and runoff, onsite treatment or incineration, provision
    of alternative water supplies, and any monitoring reasonably
    required to assure that such actions protect the public health and
    welfare and the environment. The term [also] includes the costs of
    permanent relocation of residents and businesses and community
    facilities [where] such relocation is more cost-effective [than other
    remedial action] . . . [and also] includes offsite transport and offsite
    storage, treatment, destruction, or secure disposition of hazardous
    substances and associated contaminated materials.
    
    Id.
     § 9601(24).
    36
    The statutory definitions do not provide clear insight as to the boundary
    between removals and remediations. The definitions of each type of action
    overlap substantially: certain corrective actions — like covering contaminated
    soil or diverting water away from contaminated areas with drainage controls,22
    the provision of alternative water supplies to replace contaminated water, 23
    and related monitoring activities 24 — may be classified as either “removal” or
    “remedial” actions. Over several decades of CERCLA litigation, courts have
    agreed on a general principle to distinguish the two: “[r]emoval actions are
    generally clean-up measures taken in response to immediate threats to public
    health and safety” that “address contamination at its endpoint,” while
    “[r]emedial actions are typically actions designed to permanently remediate
    22See 
    42 U.S.C. § 9601
    (24) (listing “trenches,” “ditches,” and “clay cover” as examples of
    “remedial action[s]”); 
    40 C.F.R. § 300.415
    (e) (listing “[d]rainage controls, for example, run-off
    or run-on diversion,” and “[c]apping of contaminated soils” as examples of “removal
    actions”).
    23See California ex rel. Cal. Dept. of Toxic Substances Control v. Neville Chemical Co., 
    358 F.3d 661
    ,
    667 (9th Cir. 2004) (noting that “’provision of alternative water supplies’ is listed as both a
    type of ‘remedial action’ and as a type of ‘removal’”).
    24See Colorado v. Sunoco, Inc, 
    337 F.3d 1233
    , 1244–45 (10th Cir. 2003) (explaining that
    monitoring wells could be classified as “removal” or “remedial” under both statutory
    definitions).
    37
    hazardous waste” that address contamination at its source. NYSEG, 766 F.3d at
    230–31.
    The key distinction between the two terms is immediacy and
    comprehensiveness. United States v. W.R. Grace & Co., 
    429 F.3d 1224
    , 1244 (9th
    Cir. 2005). Removal actions are undertaken to deal with “threat[s] to human
    health or the environment which require[] an immediate response.” 
    Id.
    (citations omitted).    25   Because removal actions are generally targeted at
    reducing the deleterious effects of contamination — e.g. the removal from
    downstream water supply wells of contaminants that have migrated from a
    nearby landfill, see Next Millenium, 732 F.3d at 126–27 — they are generally not
    so ambitious as to seek to eliminate or permanently contain the source of
    contamination. They do not generally aim to serve as permanent solutions. See,
    e.g., NYSEG, 766 F.3d at 231–33 (characterizing efforts to “clean[] up coal tar
    that had already migrated from [the source of contamination]” and to “remove
    25See also Barmet Aluminum Corp. v. Reilly, 
    927 F.2d 289
    , 291 (6th Cir. 1991) (“Removal refers
    to short-term action taken to halt any immediate risks posed by hazardous wastes.”); 
    40 C.F.R. § 300.415
    (b)(2) (listing various public health hazards like “exposure to nearby human
    populations, animals, or the food chain from hazardous substances or pollutants or
    contaminants” as factors to be considered in determining the appropriateness of a removal
    action).
    38
    [coal tar] from [a] river” as “removal actions” because those efforts were “not
    designed to clean up contamination at the source”); 
    id. at 233
     (“[M]easures
    taken to minimize and mitigate contamination, but not to permanently
    eliminate it, are properly classified as removal actions.”) (citation omitted).
    Removals are often planned and executed relatively quickly in order to
    immediately abate public health hazards, such as contaminated drinking
    water. 26 Accordingly, removals are often undertaken to secure prompt relief
    from a danger even though the action is not deemed a step toward permanent
    elimination of the threat. See, e.g., Colorado v. Sunoco, Inc., 
    337 F.3d 1233
    , 1244
    (10th Cir. 2003) (holding that the plugging of a mine was a “removal” action in
    part because, when the plug was installed, “it was uncertain whether the
    plugging would achieve the goal of eliminating [contamination]”). 27 In essence,
    26See Next Millenium, 732 F.3d at 126–29 (holding that two measures designed to “remove
    sufficient amounts of contamination from polluted water to render the water safe to drink”
    were “removal actions”); City of Moses Lake v. United States, 
    458 F. Supp. 2d 1198
    , 1213 (E.D.
    Wash. 2006) (action to address contamination and restore safe drinking water “bears all of the
    hallmarks of a ‘removal action’ — an interim response to minimize and stabilize imminent
    harms to human health”).
    27See also 
    id. at 1245
     (holding that the installation of monitoring wells was a “removal” action
    because the “wells were installed so that the EPA could determine . . . whether the plugging
    was effective in reducing the level of contamination in the water”).
    39
    because removals “can be initiated promptly after notification of a threat,” they
    provide “flexibility to tailor prompt and effective responses to immediate
    threats to human health and the environment.” W.R. Grace, 
    429 F.3d at 1226, 1240
    .
    Remediations, by contrast, include only actions “consistent with [a]
    permanent remedy.” 
    42 U.S.C. § 9601
    (24). Remediations are undertaken to
    permanently remediate contamination, generally after months (if not years) of
    correspondence with regulators, soil testing, data collection, safety and quality
    control analysis, and feasibility studies. See 
    40 C.F.R. § 300.430
    (a)(2) (describing
    the process of compiling a remedial investigation/feasibility study, which
    “includes the following activities: project scoping, data collection, risk
    assessment, treatability studies, and analysis of alternatives”). See generally 
    id.
    § 300.430 (describing the process a regulatory agency must undertake before
    approving or implementing a remedial action program). Unlike removals,
    remediations generally presuppose full disclosure has been made to the
    regulator of the “scope and complexity of the site problems being addressed,”
    id. § 300.430(a)(ii)(C); see also 
    42 U.S.C. § 9603
    (c), so that the remediation may
    serve as a “final, once-and-for-all cleanup of a site” designed to cost-effectively
    40
    remediate the full scope of those known problems. NYSEG, 766 F.3d at 236.
    Unlike removals, remediations typically address “the underlying source of the
    contamination.” Id. at 233 (citation omitted) (characterizing a 1980s cleanup to
    prevent coal tar that had migrated from its source from “further migrating into
    [a] river” — taken as “an immediate response to a health concern” about water
    contamination — as a removal action, but characterizing later work to excavate
    the source of the coal tar contamination as a remediation because it was
    “designed to remediate the pollution at its source”).
    Moreover, CERCLA and its implementing regulations provide a
    pathway to “transition from a removal to a remedial action if it [is]
    ‘determine[d] that the removal action will not fully address the threat posed by
    the release.’” W.R. Grace, 
    429 F.3d at
    1242–43 (quoting 
    40 C.F.R. § 300.415
    (g)).
    In other words, removal actions initially undertaken to respond to immediate
    threats may be adopted as part of a permanent remedial solution. See, e.g. Next
    41
    Millenium, 732 F.3d at 128–29 (noting that two removal measures “were
    ultimately adopted as part of a permanent remedial solution”). 28
    As passed in 1980, CERCLA did not contain a statute of limitations
    applicable to cost recovery actions under Section 107. See Merry v. Westinghouse
    Elec. Corp., 
    684 F. Supp. 852
    , 856 (M.D. Pa. 1988); United States v. Mottolo, 
    605 F. Supp. 898
    , 909–10 (D.N.H. 1985). 29 In 1986, Congress passed the Superfund
    Amendments and Reauthorization Act of 1986 (“SARA”), Pub. L. 99–499, 
    100 Stat. 1613
    , which implemented separate statutes of limitations for removals and
    28Accordingly, while Section 113(g)(2) requires that a suit to recover the costs of a removal
    action be filed “within 3 years after completion of the removal action,” it further provides that
    “if the remedial action is initiated within 3 years after the completion of the removal action,
    costs incurred in the removal action may be recovered in the cost recovery action” brought
    under the provision for cost recovery of remedial action costs. 
    42 U.S.C. § 9613
    (g)(2)(B). In
    other words, when a party transitions from undertaking removal action to undertaking
    remedial action by adopting and commencing construction of a permanent remedial solution,
    that party may bring suit to recover the costs of all its actions — whether removal or remedial
    — at any time “within 6 years after initiation of physical on-site construction of the remedial
    action.” Id.; see also H.R. Rep. No. 99–253(III), at 21 (1985) (House Judiciary Comm. Report)
    (“If a remedial action is commenced within three years of the completion of a removal action,
    costs incurred in the removal action may be added to those sought for the remedial action. In
    other words, there is no intention to mandate separate cost recovery actions for removal and
    remedial actions so long as they follow each other within a three year time period.”).
    29To evaluate the timeliness of cost-recovery claims in the absence of a statutory limitations
    period, courts applied an analogous state or federal statute of limitations or the doctrine of
    laches. See Mottolo, 
    605 F. Supp. at 909
    .
    42
    remediations. See 
    42 U.S.C. § 9613
    (g)(2). 30 Section 113(g)(2) of CERCLA, as
    amended by SARA, now provides:
    An initial action for recovery of the costs referred to in [Section
    107] must be commenced—
    (A) for a removal action, within 3 years after completion of the
    removal action . . .
    (B) for a remedial action, within 6 years after initiation of
    physical on-site construction of the remedial action . . . .
    
    42 U.S.C. § 9613
    (g)(2). The legislative history does not explain why
    Congress took a different approach to limitation periods as between removals
    and remediations. 31
    30See H.R. Rep. No. 99–253 (III), 99th Cong., 1st Sess. 1985, reprinted in 1986 U.S.C.C.A.N. 3038,
    3043–44 (explaining that the Committee on the Judiciary “believes that cost recovery . . .
    actions should be brought at the most appropriate time in light of the response action taken”
    and discussing the statutes of limitations in SARA).
    31Several early versions of the bill as considered by both the Senate and the House of
    Representatives contemplated a single statute of limitations period for all cost recovery
    actions under Section 107(a): six years from the “completion of the response action.” See
    Hearing on Reauthorization of Superfund Before Subcomm. On Commerce, Transportation, and
    Tourism of the H. Comm. On Energy and Commerce, 99th Cong. 65, 107–08 (March 1985) (noting
    that the draft bill would “establish[] a six-year statute of limitations for the filing of cost
    recovery actions” to run from the “completion of any operation and maintenance activities”)
    (EPA’s Proposed Amendments to CERCLA); S. Rep. No. 99–11, at 54–55 (March 1985) (Senate
    Comm. on Environment and Public Works) (noting that the bill under consideration would
    provide for a statute of limitations of “6 years after the date of completion of the response
    action”). By October 1985, the House considered and proposed a new version of the bill
    “distinguish[ing] between remedial actions and removal actions” for statute of limitations
    purposes, see H.R. Rep. 99–962 at 223 (1986), providing for a three-year statute of limitations
    43
    a. UCC’s construction of the earthen cap and the diversion ditch in 1992 were
    remedial
    MPM argues on appeal that UCC’s construction of an earthen cap and
    diversion ditch for the North Inactive Site (and OSi/Crompton’s construction
    of a different interceptor trench in 1994) were removals rather than
    remediations because those actions are similar to actions that this court held in
    Next Millenium and NYSEG to be removals. 32 In Next Millenium, however, we
    classified two measures — a “granulated activated carbon adsorption system”
    and an “air stripper tower,” both designed to remove volatile organic
    compounds from water supply wells in order to decontaminate drinking
    water, 732 F.3d at 122 — as removals in part because “both systems were
    installed in response to an imminent public health hazard,” which we noted
    for removal actions, to run from the “completion of the removal action,” and a three-year
    statute of limitations for remedial actions, to run from “the commencement of physical on-
    site construction of the remedial action, that is, after the RI/FS and after design of the remedy.”
    H.R. Rep. No. 99–253(III), at 21 (1985) (proposing this change). By October 1986, the House
    version of the bill had been amended to extend the statute of limitations for remedial actions
    from three years to “6 years after initiation of physical on-site construction of the remedial
    action.” See H.R. Rep. 99–962, at 39 (1986). That language is reflected in the enacted version
    of SARA. See Pub. L. 99–499, 
    100 Stat. 1613
    , 1649 (Oct. 17, 1986).
    32MPM also argues that these actions were not “consistent with a permanent remedy” as
    required by the definition of “remedial action” under 
    42 U.S.C. § 9601
    (24) because the actions
    did not deal with PCB contamination at the Site by reason of UCC’s failure to disclose that
    problem to regulators.
    44
    was “a defining characteristic of removal actions.” 
    Id. at 126
    . Moreover, the
    Next Millenium court noted that both measures “were designed . . . to address
    water contamination at the endpoint — the wells — and not to permanently
    remediate the problem by ‘prevent[ing] or minimiz[ing] the release of
    hazardous substances so that they do not migrate’ from the underlying source
    of contamination.” 
    Id. at 127
     (quoting 
    42 U.S.C. § 9601
    (24)). The measures were,
    in other words, a “respon[se] to a water-supply problem, not an environmental
    cleanup concern” because they dealt with mitigating the effects of
    contamination, rather than eliminating or containing the source of
    contamination (which, in Next Millenium, was contamination at a nearby
    hazardous waste site). 
    Id.
    In contrast, each of the measures taken by UCC and OSi/Crompton to
    deal with the North Inactive Site in the 1990s were clearly remedial in nature.
    Neither the 1992 earthen cap, nor the 1992 diversion ditch, nor the 1994
    interceptor trench were efforts to deal with any “imminent” hazard or threat to
    public safety by neutralizing contamination “at its endpoint.” See NYSEG, 766
    F.3d at 231. There is no suggestion in the record that the contamination at
    Sistersville had caused any kind of time-sensitive threat that “required an
    45
    immediate response.” W.R. Grace & Co., 
    429 F.3d at 1244
     (citation omitted); see
    
    id. at 1245
     (concluding that “removal actions encompass interim, partial time-
    sensitive responses taken to counter serious threats to public health”). Rather,
    these actions were taken as steps to permanently prevent contaminants known
    to be buried at the North Inactive Site from migrating away from their source
    — i.e., the location of their burial. Such “permanent containment” measures are
    remedial in nature. Schaefer, 457 F.3d at 195; id. at 204 (holding that the
    construction of an earthen cover to close a landfill was a remediation); see also
    
    42 U.S.C. § 9601
    (24) (defining “remedial action[s]” as those taken “to prevent
    or minimize the release of hazardous substances so that they do not migrate,”
    and listing “trenches,” “ditches” and “clay cover” as examples of “remedial
    action[s]”); W.R. Grace & Co., 
    429 F.3d at
    1238–39 (noting that the definitions of
    “remedial action” and “removal” overlap, but that the “definition of ‘remedial
    action’ . . . can be distinguished from ‘removal’ because it refers to ‘permanent’
    remedies . . . [while] ‘removal’ is focused on temporary and emergency
    activities”). 33 We conclude that the district court did not err in holding that
    33To be sure, capping contaminated soil may also be characterized as a “removal action.” See
    
    40 C.F.R. § 300.415
    (e)(4).
    46
    UCC’s construction of the earthen cap and the diversion ditch in 1992, and
    OSi/Crompton’s construction of the interceptor trench in 1994, qualified as
    remediations under CERCLA.
    b. NYSEG’s single-remediation principle was not intended to govern all
    circumstances
    The district court concluded that MPM’s claims for reimbursement of the
    costs of its remediation are time-barred by reason of UCC’s prior remediation,
    which began more than six years before MPM brought suit. The district court
    believed this conclusion was compelled by a statement in our NYSEG opinion,
    which signed on to a proposition asserted by the Tenth Circuit (and some other
    courts) that “there can only be one remedial action at a site.” 766 F.3d at 236. 34
    We believe for reasons explained below that this misinterpreted our NYSEG
    ruling.
    The NYSEG opinion, as relevant here, considered whether the plaintiffs’
    cost-recovery claims, brought in 2003, were barred by 
    42 U.S.C. § 9613
    (g)(2),
    the same statute of limitations provision that applies here. NYSEG, 766 F.3d at
    34See Sunoco, 
    337 F.3d at 1241
     (“[CERCLA’s language] indicates there will be but one ‘removal
    action’ per site or facility, as well as a single ‘remedial action’ per site or facility.”).
    47
    221. The plaintiff was the operator of two sites, Norwich and Owego, which
    had been contaminated by the defendant, a prior operator of the site. 35 At the
    Norwich site, the plaintiff had undertaken a three-phase “Interim Remedial
    Measure,” planned in consultation with the governmental regulatory agency
    to take place in 1993 (Phase I), 1996 (Phase II), and April 1997 (Phase III). Id. at
    234. The 2003 suit sought to recover the costs of Phase III only, presumably
    because a suit to recover the costs of Phases I and II would clearly have been
    barred as more than six years had elapsed from the beginning of those phases.
    Id.; 
    42 U.S.C. § 9613
    (g)(2); see also New York State Elec. & Gas Corp. v. FirstEnergy
    Corp., 
    808 F. Supp. 2d 417
    , 427 (N.D.N.Y. 2011) (“NYSEG Dist. Ct. Op.”). The
    defendant contended the suit was barred, even as to the 1997 phase, because
    the six years allowed began to run at the start of the remediation in 1993. The
    plaintiff argued that its suit was not barred because the 1997 phase of the
    cleanup was a discrete project, distinct from the prior phases, so that its
    35The NYSEG opinion also considered the timeliness of the plaintiff’s cost recovery claim for
    a response project at a third site at Plattsburgh. 
    Id.
     at 231–33. The court upheld the district
    court’s finding that, because earlier clean-up action was “more akin to a removal than a
    remedial action,” that earlier response effort did not trigger the statute of limitations for
    claims to recover remedial action costs. Id. at 233.
    48
    inception in 1997 started a new allowable six years for a cost-recovery suit. 36
    NYSEG, 766 F.3d at 234. Rejecting that argument, this court affirmed the district
    court’s finding that the three-phase cleanup was “one remedial cleanup,”
    relying, in part on the plaintiff’s having stipulated that the three stages of the
    project were a “single action comprised of three phases.” Id.
    At the one-acre Owego site, the plaintiff undertook to eliminate coal tar
    contamination between September 1994 and 1995 (the “1994 response”). Id. at
    235. After discovering additional coal tar contamination and the pipe that was
    the source of that contamination, the plaintiff undertook additional response
    activity in 2003 (the “2003 response”). See NYSEG Dist. Ct. Op, 
    808 F. Supp. 2d at 479
    ; NYSEG, 766 F.3d at 235. The defendant argued that work done in the
    2003 response was a “continuation of the remedial work begun in 1994,”
    NYSEG, 766 F.3d at 235, so that the 2003 suit was time-barred by the passage of
    six years. See 
    42 U.S.C. § 9613
    (g)(2). The district court agreed that the claim was
    time-barred, reasoning that the 1994 response and the 2003 response were part
    of the same “remedial” project, in part because both actions addressed “the
    36The plaintiff also argued unsuccessfully that the 1997 response project should be
    characterized as a removal action, rather than a remedial action. 
    Id.
     at 234–35.
    49
    same source and constituent contamination.” NYSEG Dist. Ct. Op., 
    808 F. Supp. 2d at 511
    . 37
    On review, this court affirmed the district court’s finding of
    untimeliness. NYSEG, 766 F.3d at 235–36. We rejected the plaintiff’s argument
    that the work done in 2003 was a separate and distinct remediation from the
    remedial work done in 1994, see id. at 235; see also Br. for Plaintiff at 45–47 in
    NYSEG, 
    766 F.3d 212
     (No. 11-4143) (2d Cir. 2014), characterizing it rather as a
    continuation of the earlier project.
    What we have described above fully explained and justified the NYSEG
    court’s conclusion that the suit was time-barred. As further support, however,
    the NYSEG court cited with approval the Tenth Circuit’s statement in Colorado
    v. Sunoco that the CERCLA statute envisages only one “’remedial action’ per
    site.” 
    337 F.3d at 1242
    . The district court in the case now before us understood
    that proposition as categorically applicable in all circumstances. MPM I, 
    2016 WL 3962630
    , at *14. For reasons explained below, we believe the NYSEG
    37The district court also rejected the argument that, because the 2003 action was targeted at a
    different “operable unit” than the 1994 action, the actions were separate “remedial actions,”
    in part because the two operable units were “insufficiently distinct to support the application
    of separate limitations periods.” 808 F. Supp. at 511.
    50
    opinion cannot have intended this proposition to govern every different
    remediation circumstance. The proposition, although altogether reasonable in
    the conventional circumstances to which it was applied in NYSEG, Sunoco, and
    other cases, cannot have been intended to apply in very different
    circumstances, in which application of that proposition would make little
    sense.
    In NYSEG, as reviewed above, the plaintiff had undertaken a series of
    remedial steps directed towards remediation of a contamination problem
    perceived at the outset; the subsequent steps were either explicitly foreseen at
    the start of the remediation (Norwich), see NYSEG, 766 F.3d at 234, or at least
    contemplated (Owego), id. at 235; see also NYSEG Dist. Ct. Op., 
    808 F. Supp. 2d at 478
     (noting that the regulatory agency had defined the Susquehanna River,
    the site of the subsequent response project, as an operational unit in March
    1994, and that the operator begun an investigation of that operational unit in
    1996). And nothing would have prevented the plaintiff from suing the
    contaminator, both to recover remediation costs already expended, and for a
    declaratory judgment as to liability and allocation of future costs, within the six
    years allowed for such a suit. See 
    42 U.S.C. § 9613
    (g)(2) (allowing for a forward-
    51
    looking claim for a “declaratory judgment on liability for . . . further response
    costs”). As applied to such circumstances, the single-remediation principle
    means simply and logically that the plaintiff cannot escape the six-year
    limitation period and endlessly postpone the bringing of suit by characterizing
    subsequent phases of the initial project as new remediations. A plaintiff whose
    suit is time-barred in such circumstances has suffered no unfairness as the
    preclusion was simply the result of the plaintiff’s needless delay.
    The several precedents that NYSEG followed in uttering the single-
    remediation principle similarly involved the same conventional circumstance,
    for which that principle is fair and sensible. The plaintiffs — with at least a
    general awareness of the contamination problems — had undertaken at the
    outset to remedy them. The subsequent stages of response were either (1)
    further steps towards remediating the original problems, see, e.g., California ex
    rel. Cal. Dep’t of Toxic Substances Control v. Hyampom Lumber Co., 
    903 F. Supp. 1389
    , 1390–91 (E.D. Cal. 1995), or (2) steps to remediate different aspects of the
    originally known problem, see, e.g., Sunoco, 
    337 F.3d at
    1237–38. And there was
    no impediment that would have prevented the plaintiffs from suing the
    52
    contaminator within six years of initiating the remediation as to both past and
    future remediation work.
    In Hyampom, for example, the District Court for the Eastern District of
    California considered a series of steps undertaken by California’s regulatory
    agency to remove contaminated soil from the site of a lumber mill. 
    903 F. Supp. at 1390
    . Those steps included: (a) the installation, in 1987 and 1988, of fences
    around the contaminated areas; (b) the construction, in September 1988, of
    temporary water and electrical infrastructure in preparation for the excavation
    of the contaminated areas; and (c) the excavation of the contaminated areas
    beginning in October 1988. 
    Id.
     at 1390–91. There was no question that each of
    these steps were undertaken to remediate the same problem, and to bring about
    the same desired remedy, which the California Department of Toxic Substances
    (the regulator in charge of overseeing the cleanup) had identified in its
    Remedial Action Plan as the “excavat[ion] and remov[al] [of] the contaminated
    soil from the site.” 
    Id. at 1390
    . There was nothing to prevent the State of
    California, which sought to recover the costs incurred by its regulator (under
    the same CERCLA provision as asserted here by MPM) from bringing a cost-
    recovery suit within six years of the “initiation of physical on-site construction”
    53
    of its overall remediation effort. Because California failed to bring the suit
    within six years, it was not timely.
    The situation considered in Colorado v. Sunoco involved cleanup activities
    at a former gold mine site that contained contaminated water. 
    337 F.3d at
    1237–
    38. The EPA, together with the State of Colorado, took control of the site in 1992
    to deal with multiple environmental threats, including (a) several adits (i.e.
    horizontal mine openings for drainage) in the gold mine through which
    “metal-contaminated, acidic water” drained out of the mine and into the
    environment and (b) a “heap leach pad” containing waste treatment sludge
    leftover from mining and waste treatment operations. 
    Id.
     at 1236–38. The EPA’s
    initial cleanup operations — undertaken in 1994 — included the improvement
    of the water treatment systems that dealt with the contaminated water on the
    “heap leach pad” and the plugging of the mine adits to prevent contaminated
    water from leaking out of the mine. 
    Id. at 1237
    . The EPA later determined that
    a “permanent sludge disposal area” was required for disposal of the sludge
    from the heap leach pad; it undertook construction of that disposal area
    sometime between 1994 and 1996. 
    Id. at 1238
    . It is clear that EPA undertook
    each of these steps to deal with the set of issues it set out to remediate when it
    54
    took control of the site in 1992, and that each step was a phase in the regulator’s
    effort to bring about its desired “permanent remedy.” 
    42 U.S.C. § 9601
    (24)
    (defining “remedial action”). 38 There was no reason why the regulator could
    not have brought its suit within six years of the commencement of its response
    project in 1994; its failure to do so until 2001 meant that, as the Tenth Circuit
    38The other appellate case cited by the NYSEG opinion, Kelley v. E.I. DuPont de Nemours and
    Co., 
    17 F.3d 836
     (6th Cir. 1994), followed a similar pattern. That case concerned a 34–acre
    landfill polluted with large amounts of chemical waste contained in “open or sealed 55–gallon
    drums.” 
    Id. at 838
    . After determining that the drums contained hazardous waste and
    detecting the presence of other hazardous substances in the groundwater, regulators
    commissioned a contractor, Haztech, to remove surface waste from the site in October 1985.
    
    Id.
     As part of that effort, Haztech removed several drums from the surface of a pond that
    “contained bluish colored water.” 
    Id.
     The regulator simultaneously hired a different
    contractor to perform site evaluation activities, which revealed the presence of additional
    solid waste in the blue-water pond in 1987. 
    Id. at 839
    . After that discovery, the regulator hired
    a different contractor, Inland Water, to perform further remediation work on the blue-water
    pond, consisting of the removal of additional drums and 1,150 cubic yards of contaminated
    soil. 
    Id.
     As in Sunoco, there was no question that the 1985 and 1987 response projects were
    directed at the same contamination problem and constituted different “phases” of the
    response action required to bring about the regulator’s desired remedy.
    The NYSEG opinion also cited Yankee Gas Servs. Co. v. UGI Utils., Inc., 
    616 F. Supp. 2d 228
     (D.
    Conn. 2009) in support of its single-remediation principle. However, while the court in that
    case noted that “courts have generally held that there can be only one . . . remedial action per
    facility, regardless of the number of phases in which the clean-up occurs,” see 
    id. at 270
    , that
    statement had no relevance to the court’s holding that several of the claims were time-barred
    because, in that case, all of the response projects under consideration were commenced more
    than six years before the plaintiff filed suit. See 
    id. at 269
     (noting that the plaintiff filed suit in
    September 2006); 
    id. at 271
     (noting that the most recent response project at the Norwalk site
    was commenced in 1999); 
    id. at 274
     (noting that the most recent response project at the
    Willimantic site was commenced in 1997).
    55
    held, it would have lost the opportunity to take advantage of CERCLA’s cost-
    recovery provisions for remediation. 39
    In the circumstances of NYSEG (and in the precedents it cites), the single-
    remediation principle was logical and fair, and it served the designs and
    objectives of RCRA and CERCLA. Although it is a reliable prescription in the
    great majority of cases, we do not believe that our NYSEG panel intended the
    principle to control if the circumstances of a case would render it illogical and
    unfair, and would defeat the statutory design or objectives.
    The most obvious example of inappropriate application of the single-
    remediation principle would arise when the subsequent remediation
    undertakes to remediate a problem that did not exist at the time of the prior
    remedial act. If, following a remediation, the operator of a site creates a
    different contamination, caused by different processes and a different
    39The Sunoco court ultimately disagreed with the district court’s characterization of the EPA’s
    1994 installation of adit plugs as a “remedial action,” and held instead that those efforts were
    properly characterized as a “removal action.” 
    337 F.3d at 1243
    . It remanded the question
    whether the subsequent construction of a sludge disposal area was a removal or a
    remediation. 
    Id.
     at 1244–46. Because the court held that there was no prior remediation that
    could have barred the regulator’s claim for recovery of its later incurred remedial costs, the
    court’s statement that “there will be but one . . . ‘remedial action’ per site or facility,” 
    id. at 1241
    , was dictum that played no role in the decision.
    56
    contaminating substance, and the burden of remediating that contamination
    falls on a new owner that acquires the site many years later, there would never
    be a moment when the new owner could sue to recover its response costs.
    When such future contaminations occurred and became known, future owners
    or operators would be compelled by CERCLA and RCRA to report the
    discovery to government regulators and undertake any remediation that
    regulators may deem necessary, see 
    42 U.S.C. § 9603
    (a) (requiring disclosure);
    
    id.
     § 6924(u) (instructing regulators to “require[] corrective action for all
    releases of hazardous waste”); see also MPM III, 
    2017 WL 6408611
    , at *21 (noting
    that the RCRA permit for the Site required notification to regulators of newly-
    discovered contamination within seven days), but any suit to recover the cost
    of such remediation from the contaminator would be untimely by reason of a
    prior remediation decades in the past that had nothing to do with the present
    contamination, then as yet non-existent. We do not believe the NYSEG panel
    intended its single-remediation principle to apply in such a circumstance.
    A second less obvious but equally illogical and inappropriate example
    would arise when a site operator discovers a previously unsuspected
    contamination that was unrelated to, and perhaps far distant from, a
    57
    previously remediated contamination. Suppose, for example, that the owner of
    a 10,000 acre site in 1990 completely remediated a chemical spill that it had
    caused on a tiny corner of a site. Suppose further that another operator
    acquired the site many years later and discovered a fifty-year-old
    contamination, far distant from, and unrelated to the contamination that had
    been remedied in 1990, and unsuspected at that time. If the single-remediation
    principle were to be categorically applied, the new owner, although compelled
    by law to report and remediate, would be unfairly precluded from utilizing
    CERCLA’s cost-recovery mechanism to recover the necessary costs of cleanup
    from the party responsible.
    If, in a third scenario analogous to the present case, the original polluter
    implemented an inadequate remediation pursuant to a regulatory approval
    that was procured by inadequate disclosure, and then held the site for six years
    after the misguided project began, a later owner who discovers the
    contamination that the prior remediation failed to address would nevertheless
    be obliged to disclose and remediate it, but could not recover its costs if the
    single-remediation principle were applied. The original polluter would enjoy
    an undeserved immunity as a result of its inadequate disclosure of what
    58
    needed to be remediated, and its retention of the site for six years after initiating
    its incomplete remediation.
    A categorical single-remediation principle, while logical for the
    conventional pattern of cost-recovery suits, such as NYSEG, would frustrate
    and defeat the efficacy of cost-recovery as an essential motivator in the
    RCRA/CERCLA framework. Without access to cost-recovery suits against
    contaminators, neither private parties nor regulators would be incentivized to
    ensure that cleanups are conscientious and thorough. Cf. Key Tronic Corp. v.
    United States, 
    511 U.S. 809
    , 819 n.13 (1994) (“CERCLA is designed to encourage
    private parties to assume the financial responsibility of cleanup by allowing
    them to seek recovery from others.” (internal quotation marks omitted)
    (quoting FMC Corp. v. Aero Indus., Inc., 
    998 F.2d 842
    , 847 (10th Cir. 1993))).
    Worse still, an operator who, after taking ownership of a site, discovers
    preexisting contamination, if deprived of access to cost recovery, might conceal
    its discovery from regulators; if it disclosed the contamination, as CERCLA and
    the site’s RCRA permit would require, see 
    42 U.S.C. § 9603
    (a); MPM III, 
    2017 WL 6408611
    , at *21, it may be required to undertake catastrophically costly
    remediation at its own expense while the contaminator, which should bear the
    59
    costs, enjoys wholly unjustified immunity that results from overbroad
    application of a notion invented by the courts. Overbroad application of the
    single-remediation principle would accordingly undercut CERCLA’s manifest
    purpose to “encourag[e] the timely cleanup of hazardous waste sites” by
    private parties by “placing the cost of that cleanup on those responsible for
    creating or maintaining the hazardous condition.” Consolidated Edison Co. of
    New York, Inc. v. UGI Utils., Inc., 
    423 F.3d 90
    , 94 (2d Cir. 2005) (alteration,
    brackets, internal quotation marks, and citation omitted); see also H.R. Rep. No.
    99–253(III), 1986 U.S.C.C.A.N. 3038, 3038 (explaining that one of CERCLA’s
    two primary goals is to “hold responsible parties liable for the cost of
    [necessary environmental] cleanups”).
    There is nothing in the words of the statute that invites a categorical
    single-remediation principle. Although Sunoco (which NYSEG cited) tried to
    find support within the statute’s wording, see 
    337 F.3d at 1241
    , the grammatical
    principle that the court invoked would, under careful examination, support the
    opposite conclusion.          40   Moreover, the fact that neither the statute, nor the
    40   The pertinent sentence of § 9613(g)(2) reads:
    60
    [F]or a remedial action, [an initial action for recovery of costs must be
    commenced] within 6 years after initiation of physical on-site construction of
    the remedial action, except that, if the remedial action is initiated within 3 years
    after the completion of the removal action, costs incurred in the removal action
    may be recovered in the cost recovery action brought under this subparagraph.
    The Tenth Circuit reasoned that the use of the definite article (“the”) in the second clause
    foreclosed the possibility of multiple remedial actions at a site, noting “[i]f Congress intended
    to allow multiple actions for separate components of recovery of remedy, it surely would
    have used the indefinite article ‘a’ rather than the definite article ‘the’ to modify the phrases
    ‘removal action’ and ‘remedial action.’” Sunoco, 
    337 F.3d at 1241
    . This puts more weight on
    the choice of article than the choice can bear. In any event, this overlooks the fact that, in the
    first usage of the term “remedial action,” the term is preceded by the indefinite article (“a
    remedial action”). The use of the definite article (“the”) in a subsequent reference to “remedial
    action” means that the subsequent reference is to the same “remedial action” as was
    previously mentioned. Suppose that one writes, “When interpreting a statute, courts must
    focus on the statute’s text.” The definite article (“the”) is used in the second reference to
    “statute.” But the first reference used the indefinite article (“a”). The use of “the” in the second
    reference means only that the second reference is to the previously mentioned statute. It does
    not mean that there can be but one statute to which the statement applies. The use of “the
    remedial action” in our statute’s second reference serves the same function as using “it” to
    refer to the earlier mentioned remedial action. If Congress had used “the” in its first reference
    to “remedial action,” that would have given arguable support to the Sunoco reasoning, but
    use of “the” following an introductory reference to “a remedial action” gives no support
    whatsoever. If anything, it demonstrates the contrary.
    Moreover, the language on which the Tenth Circuit relied was not included in the CERCLA
    bill enacted in 1980, which implemented the definition of “remedial action” that remains in
    force today. That language was enacted six years later, as a part of SARA. See Pub. L. No. 99–
    499 (1986). There is no indication that Congress intended this part of SARA, which was
    evidently intended to create a statute of limitations for CERCLA cost-recovery claims where
    none existed before, see Section-by-Section Analysis: EPA’s Proposed Amendments to CERCLA,
    99th Cong. 1st Sess, 131 Cong. Rec. 200000-25, 
    1985 WL 700809
    , at *28 (Feb. 22, 1985), to modify
    the definition of “remedial action” it had enacted six years earlier so as to foreclose the
    possibility of multiple remedial actions. See Whitman v. Am. Trucking Ass’ns, 
    531 U.S. 457
    , 468
    (2001) (“Congress . . . does not alter the fundamental details of a regulatory scheme in . . .
    ancillary provisions—it does not, one might say, hide elephants in mouseholes.”).
    61
    implementing regulations define the term “site” means that it can be applied
    to large areas, exacerbating the problems that could result from overly broad
    application of the concept.
    For the reasons explained above, we understand the single-remediation
    principle stated in NYSEG to mean that, when a remediation is undertaken
    under a remediation plan based on full disclosure of the known problem,
    successive remedial steps undertaken in furtherance of the original objective
    are part of a single remediation for purpose of the statute of limitations, so that
    the remediator may not delay suit by classifying subsequent stages of
    remediation of the original problem as new remediations. See NYSEG, 766 F.3d
    at 236. In that sense, there can be “only be one remedial action at a site” with
    respect to the particular contamination addressed and remedy conceived. Id.
    When, as in NYSEG, the contamination to be addressed arises from a single
    source, and the operator undertakes to remedy that “underlying source of []
    contamination,” 766 F.3d at 233 (citation omitted), the distinct steps taken in
    furtherance of that objective will constitute a single remediation. But a
    subsequent remediation, undertaken to address a different source of
    62
    contamination outside the scope of the prior remediation, may constitute a
    separate and distinct remediation for statute of limitations purposes.
    This interpretation comports more closely to the language and structure
    of the statute. CERCLA defines a “remedial action” as “those actions consistent
    with [a] permanent remedy . . . in the event of a release or threatened release of a
    hazardous substance into the environment.” 
    42 U.S.C. § 9601
    (24). This language
    indicates that the term “remedial action” refers not to any remedial activity
    undertaken on a particular site, but instead to remedial steps intended to deal
    with a particular “release or threatened release of a hazardous substance.” Id;
    see also S. Rep. No. 96–848 at 54 (July 11, 1980) (“Remedial action may be taken
    in response to a discharge, release, or a significant threat of discharge[,] release,
    or disposal of a hazardous substance.”).
    CERCLA’s implementing regulations confirm this understanding:
    typically, remediations are only undertaken after a lengthy process of data
    collection, the goal of which is to produce a comprehensive description of the
    “history/nature of waste handling” at the site and a “description of known
    contaminants.” See 
    40 C.F.R. § 300.420
    (c); 
    id. 300
    .430(b). After the operator and
    the regulator obtain a comprehensive view of the “scope and complexity of the
    63
    site problems being addressed,” 
    id.
     § 300.430(a)(1)(ii)(C), the parties analyze
    alternative courses of action, conduct feasibility studies, and select a remedy.
    See generally id. § 300.430. It follows that the remediation that emerges from this
    process, while designed to be a “final, once-and-for-all cleanup of a site,”
    NYSEG, 766 F.3d at 236, is necessarily limited in scope to those problems
    revealed during the remedial investigation. A subsequent remediation that
    seeks to address a different set of problems — e.g. problems that were non-
    existent, unknown, elsewhere, or undisclosed to the regulators and unrevealed
    in an earlier remediation plan — should not be considered part of the same
    remediation. 41
    In deciding whether to characterize a later remedial activity, for statute
    of limitations purposes, as a continuation of previously conducted
    41 An explicit statement in NYSEG tends to confirm that the opinion did not intend its
    generalization to apply to the circumstances outlined above. The opinion conceived the
    single-remediation principle as designed to serve logic and fairness. Its statement that “it
    would not be logical — or fair — to subject [a potentially responsible party] to additional
    CERCLA lawsuits seeking yet additional permanent relief” after that potentially responsible
    party has already completed a remediation, 766 F.3d at 236, makes good sense when applied
    in the circumstances of NYSEG and the cases cited in that opinion. But in the different
    circumstances described above in this opinion, it would be the application of the single-
    remediation principle that would cause unfairness. The fact that NYSEG saw the idea as one
    serving fairness reinforces the suggestion that NYSEG did not intend its application in
    circumstances where, rather than protect against unfairness, it would cause unfairness.
    64
    remediation, or as a separate and distinct remediation entitled to a new six-
    year period for cost recovery, a helpful inquiry would be to examine whether
    the recent action (sought by the remediator to be characterized as a new
    remediation) falls within the remedial scope of the previous remediation as
    revealed in the record before the regulatory agency. In many cases, the record
    of the correspondence between the regulatory agencies and the original
    remediators will reveal much about the nature and scope of the problem to be
    remediated as it was initially conceived. See 
    40 C.F.R. § 300.430
    (f)(5)(i) (“To
    support the selection of a remedial action, all facts, analyses of facts, and site-
    specific policy determinations considered in the course of carrying out
    activities in this section shall be documented, as appropriate, in a record of
    decision . . . .”). CERCLA and its implementing regulations make clear that
    remediation requires “characteriz[ing] the nature of and threat posed by the
    hazardous substances,” including the “general characteristics of the waste,
    including    quantities,   state,   concentration,    toxicity,   propensity    to
    bioaccumulate, persistence, and mobility,” in addition to analyzing various site
    characteristics, to “conduct a site-specific baseline risk assessment.” 
    Id.
    § 300.430(d)(2), 300.430(d)(4). An assessment of the documentary record
    65
    associated with the prior remediation will often show whether subsequent
    action is a continuation of it or distinct in its remedial purpose and scope.
    When, for example, the record reveals that the more recent remediation
    addresses a different problem than the previous remediation, e.g., a “release or
    threatened release of a hazardous substance” that was unrecognized or had not
    even occurred at the time of the previous remedial activity, that would suggest
    that the recent remediation should be treated as a new and distinct remediation
    for statute of limitations purposes. 42 On the other hand, the more the agency
    record shows that the recent remedial activity seeks to bring about essentially
    the same “permanent remedy” of the same problem as was the goal of the prior
    remediation, the more appropriate to consider the recent remediation as a
    continuation of the prior remediation. NYSEG, 766 F.3d at 235. (As we
    recognized in NYSEG, the possibility that technological advancement may
    42See, e.g., Valbruna Slater Steel Corp. v. Joslyn Mfg. Co., No. 1:10-cv-044, 
    2013 WL 1182985
    , at
    *12 (N.D. Ind. Mar. 21, 2013) (finding that a recent remedial action was “distinct from the
    remedial project undertaken by [a previous owner] over the last decade” because the previous
    project “dealt primarily with RCRA compliance in two small areas that comprised only a
    fraction of the whole Site, not with overall CERCLA compliance at the whole Site, as the
    current remedial plan does,” and were carried out “before the current Site-wide remedial
    action was even found to be necessary”).
    66
    reveal new methods of remediating a particular contamination problem would
    not necessarily create the opportunity to pursue such methods as a distinct
    “remedial action,” particularly if those methods undertake to solve the same
    problems already addressed by the prior remediation. NYSEG, 766 F.3d at 236
    (“[W]e recognize that what seems final at a given point in time might come to
    appear inadequate at a later date as scientific knowledge progresses.”).)
    We conclude that the district court’s reliance on the single-remediation
    principle asserted in NYSEG did not necessarily support its conclusion that
    MPM’s cost recovery action was untimely. We vacate the judgment and
    remand for further consideration. Consistent with our discussion above, the
    district court’s analysis on remand should address whether MPM’s remedial
    activity addressed to buried PCBs is part of the remediation begun by UCC in
    the 1990s, such that the instant suit filed in 2011 is untimtely, or should be
    deemed a separate and distinct remediation, entitled to a new six-year
    limitation period.
    ii.   Future Removal Costs
    With respect to removal costs MPM may incur in the future, UCC
    challenges the district court’s declaratory judgment that UCC is liable for at
    67
    least a share, as well as its allocation of 95% of those costs against UCC. UCC
    argues first that the possibility of future removal costs is too remote to present
    a constitutionally ripe controversy as to its liability for those costs, UCC Br. at
    44–48; second, that the circumstances are “too speculative” to present a ripe
    controversy over the allocation of future costs, id. at 48–55; and, third, that cost
    allocation is not “prudentially ripe” because the issue would “benefit from []
    further factual development” and because “[d]eferring allocation of
    hypothetical future removal costs would impose no real hardship on MPM,”
    id. at 55–56 (citation omitted). 43 We disagree.
    43UCC further argues that, while § 113(g)(2) of CERCLA does require a court to issue “a
    declaratory judgment on liability for response costs,” the statute does not require a
    declaration of “future allocation when a party is found liable for past response costs.” UCC
    Br. at 57. UCC further argues that the district court’s decision to issue such a declaration was
    an abuse of discretion under the Declaratory Judgment Act because that declaration neither
    “serve[s] a useful purpose” nor would it “finalize the controversy and offer relief from
    uncertainty.” Id. (quoting Dow Jones & Co. v. Harrods Ltd., 
    346 F.3d 357
    , 359 (2d Cir. 2003)). For
    the reasons stated in this subsection, we reject UCC’s argument.
    Moreover, UCC argues that the district court abused its discretion by failing to include in its
    declaratory judgment a contingency provision which would authorize the parties to relitigate
    the allocation if “new facts or future events render the current division inequitable,” citing to
    the Third Circuit’s decision in Beazer East, Inc. v. Mead Corp., 
    412 F.3d 429
    , 449 (3d Cir. 2005)
    (noting that “[s]uch contingency provisions are generally favored in CERCLA contribution
    actions”). UCC Br. at 57–58. MPM points out, MPM Reply Br. at 39–40, that the Third Circuit
    held that such a provision would be appropriate in Beazer because, in that case, both the
    plaintiff and the defendant were potentially responsible for the contamination, and that the
    district court’s “allocation would no longer be fair if any required remediation is primarily or
    68
    a. Constitutional ripeness
    First, we find neither error nor abuse of discretion in the district court’s
    conclusion that the liability and allocation issues were constitutionally ripe for
    review due to the very high likelihood that MPM will incur future response
    costs. MPM III, 
    2017 WL 6408611
    , at *16–17. The doctrine of constitutional
    ripeness is “drawn from Article III limitations on judicial power” and
    “prevents a federal court from entangling itself in abstract disagreements over
    matters that are premature for review because the injury is merely speculative
    and may never occur.” In re Methyl Tertiary Butyl Ether (MTBE) Prods. Liability
    Litig, 
    725 F.3d 65
    , 110 (2d Cir. 2013) (citations omitted). 44 There is no merit to
    UCC’s contention that it is speculative whether MPM will incur costs to deal
    with the PCB contamination it has uncovered at the Site. To the contrary, it is
    exclusively directed to those areas of the Site where [the plaintiff] is responsible for the
    majority of the contamination.” Beazer, 
    412 F.3d at 449
     (quotation marks omitted). We agree
    that Beazer involved drastically different circumstances and that here, because UCC is the
    only party responsible for PCB contamination at the Site, and because no future developments
    will alter that fact, the district court did not abuse its discretion by failing to include such a
    contingency provision. But see infra at 80–81.
    44A request for a declaratory judgment is constitutionally ripe for review when “there is a
    substantial controversy, between parties having adverse legal interests, of sufficient
    immediacy and reality.” Duane Reade, Inc. v. St. Paul Fire & Marine Ins. Co., 
    411 F.3d 384
    , 388
    (2d Cir. 2005) (quoting Md. Cas. Co. v. Pac. Coal & Oil Co., 
    312 U.S. 270
    , 273 (1941)).
    69
    undisputed that MPM plans to continue with its wastewater treatment facility
    upgrade, which will “require that MPM respond appropriately to PCBs in the
    soils” in that area. MPM III, 
    2017 WL 6408611
    , at *17. 45 MPM submitted a plan
    for PCB management during its wastewater treatment upgrade, which
    anticipates the necessity of the disposal of contaminated soil, along with other
    measures intended to “minimize the risk of spreading contamination,” and the
    WVDEP has approved that plan. There is a substantial likelihood that,
    depending on how these plans progress, at least some actions MPM will
    undertake to deal with UCC’s contamination of the Site — the extent of which
    is currently “unknown” — will be “clean-up measures taken in response to
    immediate threats to public health and safety,” which are properly
    characterized as removals. NYSEG, 766 F.3d at 230–31. 46 Accordingly, we
    45That neither WVDEP nor the EPA have yet required MPM to undertake any response
    project in response to its discovery of PCB-contaminated soil at the site does not make the
    possibility of MPM’s expenditure of future costs speculative. See Cadillac Fairview/California v.
    Dow Chemical Co., 
    840 F.2d 691
    , 696 (9th Cir. 1988) (“The absence of a government enforcement
    action under CERCLA does not render the controversy between the party seeking declaratory
    relief and the party who owned the site at the time of the hazardous waste disposal remote
    and hypothetical.”).
    46UCC also argued that MPM’s only concrete plan for future response activity at the site — a
    soil management plan regarding the “proper handling, characterization and disposal of
    potentially impacted soil” in work areas around the wastewater treatment unit — would be
    70
    conclude that the district court did not exceed its Article III jurisdiction in
    adjudicating UCC’s liability for the future removal costs that MPM is likely to
    incur. See Kelley v. E.I. DuPont du Nemours and Co., 
    17 F.3d 836
    , 844–45 (6th Cir.
    1994) (rejecting the argument that the district court’s declaration of future
    liability for cleanup costs was improper because “the wide-ranging
    contamination [at the relevant site] makes it more certain than speculative that
    the [claimant] will have to expend resources in the future”). 47
    b. Prudential ripeness
    a remediation (not a removal), and that the likelihood of MPM undertaking that remediation
    is irrelevant to the question whether MPM was likely to incur future removal costs. We
    disagree, in part because (as expressed above) the circumstances indicate a substantial
    likelihood that MPM will incur removal costs in the future. Additionally, we agree with
    MPM’s argument that it should not be required to prove definitively, at this stage in the
    litigation, that the future costs it will likely incur would necessarily be characterized as
    removals in order to establish that its demand for a declaratory judgment as to UCC’s liability
    for future removal costs is ripe. MPM Reply Br. at 30–31. As noted above, the classification of
    an action as a removal or a remediation is subtle and fact-intensive; requiring a plaintiff
    contemplating future response action to prove definitively that such action will be in the
    nature of removal rather than remediation in order to invoke the court’s subject matter
    jurisdiction would be inconsistent with governing precedent that a “risk of real harm” is
    sufficient to invoke a federal court’s subject matter jurisdiction. See Spokeo, Inc. v. Robins, 
    136 S. Ct. 1540
    , 1549 (2016).
    47 In support of its argument, UCC argues that “[t]o establish a constitutionally ripe
    controversy . . . MPM [] must show that its future removal costs are certainly impending,” citing
    to the Supreme Court’s decision in Clapper v. Amnesty International USA, 
    568 U.S. 398
    , 409–10
    (2013). UCC Br. at 45–47 (emphasis added). This is a misreading of Clapper. The Supreme
    Court in that case — and in future rulings — clarified that a “substantial risk” of harm will
    suffice to meet Article III’s case or controversy requirements. Clapper, 
    568 U.S. at
    414 n.5; see
    also Susan B. Anthony List v. Driehaus, 
    573 U.S. 149
    , 158 (2014).
    71
    The district court also correctly concluded that the issue of UCC’s
    liability and responsibility for MPM’s future response costs was prudentially
    ripe. The doctrine of prudential ripeness requires a court to ask “whether the
    claim is fit for judicial resolution” and “whether and to what extent the parties
    will endure hardship if decision is withheld,” and permits a court to decline to
    exercise its jurisdiction upon determining that “the case will be better decided
    later.” MTBE, 725 F.3d at 110 (brackets and citations omitted). The district court
    determined that the issue was fit for judicial resolution because the evidence
    necessary to determine UCC’s responsibility for MPM’s future response costs
    was “before the Court and unlikely to change.” MPM III, 
    2017 WL 6408611
    , at
    *18. In particular, the court noted that “the two factors that weigh most heavily
    in [its] allocation of responsibility in this case — UCC’s status as the sole entity
    responsible for using and disposing of PCBs at the Site and MPM’s delay in
    reporting its discovery of PCBs to environmental regulators — are settled.” 
    Id.
    Further, the district court determined that it would be “unjust” to “require
    MPM to wait for allocation until MPM has ascertained [the extent of its] future
    PCB response costs,” given the “considerable” cost and time the parties had
    spent litigating this case, and that determining the parties’ respective financial
    72
    responsibility for future cleanup costs without delay — as CERCLA requires
    — would “advance CERCLA’s ‘dual goals of cleaning up hazardous waste and
    holding polluters responsible for their actions.’” 
    Id.
     (quoting NYSEG, 766 F.3d
    at 220).
    UCC argues that the issue is not fit for resolution because “many facts
    relevant to the parties’ relative responsibility for future removal costs are
    inherently unknowable and subject to substantial uncertainty” as “many of the
    circumstances of a future cleanup are unknown.” UCC Br. at 49–51. 48 UCC
    further points to several specific uncertainties which, in its view, should
    preclude a determination of cost allocation, including (a) the “extent or impact”
    48UCC contends that, in New York v. Solvent Chemical Co., 
    664 F.3d 22
     (2d Cir. 2011), we held
    that “when a cleanup is in progress, allocation should be deferred until ‘the uncertainties
    regarding ongoing response costs have been resolved.” UCC Br. at 49–50 (quoting Solvent
    Chemical, 
    664 F.3d at 27
    ). UCC’s argument mischaracterizes our holding. In that case, the
    district court had declined to issue a declaratory judgment as to the parties’ respective liability
    for future response costs “chiefly because the allocation of future costs would be premature.”
    Solvent Chemical, 
    664 F.3d at 24
     (emphasis in original); see also New York v. Solvent Chemical Co.,
    Inc., 
    685 F. Supp. 2d 357
    , 455–56 (W.D.N.Y. 2010) (declining to allocate future costs for lack of
    sufficient data, and because regulators were “still considering alternative remedial
    proposals”). This court reversed in part, holding that the district court abused its discretion
    by declining to issue a declaratory judgment as to liability, but did not require the district
    court to issue a cost allocation order. 
    664 F.3d at 26
    . That holding does not in any way establish
    that the court may not issue a cost allocation order “when a cleanup is in progress,” UCC Br.
    at 49–50, particularly when the district court is satisfied that all the evidence required to issue
    such an order is before the court and “unlikely to change.” MPM III, 
    2017 WL 6408611
    , at *18.
    73
    of MPM’s delay in addressing the PCB contamination, (b) the extent of MPM’s
    future cooperation with regulators, (c) the extent to which MPM will benefit
    economically from its future cleanup efforts, (d) the extent to which MPM is
    and will be responsible for “secondary disposal” of excavated contaminated
    material at the site, and (e) whether OSi/Crompton will indemnify MPM for
    any of its future response costs. UCC Br. at 51–54. UCC further asserts that
    MPM’s “future removal actions [] may well never occur,” arguing that
    resolution of its responsibility should wait “at least until (if ever) a concrete
    plan exists to conduct a removal action and more is known about the attendant
    circumstances.” 
    Id. at 56
    .
    We are not persuaded. CERCLA provides a district court tasked with
    allocating responsibility for cleanup costs between potential responsible
    parties with “broad discretion to balance the equities in the interests of justice,”
    and “does not limit courts to any particular list of factors” to consider when
    making that determination. Bedford Affiliates v. Sills, 
    156 F.3d 416
    , 429 (2d Cir.
    1998), overruled on other grounds by W.R. Grace, 559 F.3d at 89–90. The district
    court was clear that the two factors on which it primarily relied were (a) UCC’s
    sole responsibility for the PCB contamination at the Site, and (b) MPM’s delay
    74
    in cooperating with regulators after its discovery of PCB-contaminated soil.
    MPM III, 
    2017 WL 6408611
    , at *18. The district court found that the evidence
    supporting these two determinative factors was “unlikely to change.” 
    Id.
     The
    district court had a sound basis for concluding that UCC’s insistence on
    uncertainties was exaggerated and did not call for delay in adjudicating
    allocation. 
    Id.
     49
    As to the “hardship” element of prudential ripeness, MTBE, 725 F.3d at
    110 (instructing courts to determine “whether and to what extent the parties
    will endure hardship if decision is withheld”), UCC argues that “[d]eferring
    allocation of hypothetical future removal costs would impose no real hardship
    on MPM” because “[i]f MPM ever does develop a concrete plan beyond [its Soil
    Management Plan], it can seek an allocation then.” UCC Br. at 56–57. This
    49For this reason, cases like Port of Portland v. Union Pacific Railroad. Co., No. 98-cv-886, 
    2001 WL 36135190
     (D. Or. Mar. 26, 2001) and Georgia-Pacific Consumer Products. LP v. NCR Corp.,
    
    358 F. Supp. 3d 613
     (W.D. Mich. 2018), in which courts have declined to allocate costs due to
    the inadequacy of the factual record to make that determination, have no bearing on this case.
    See Georgia-Pacific, 358 F. Supp. 3d at 645 (declining to issue a declaration of financial
    responsibility for future cleanup costs where there were four potentially liable parties, each
    of whom contributed to pollution in different areas, because “[t]here is a high level of
    uncertainty as to the shape of what remedies will actually apply, and no real basis to assess
    costs”); Union Pac., 
    2001 WL 36135190
    , at *10 (declining to issue declaratory relief as to cost
    responsibility because of the “site’s long history and many possible sources of contamination”
    at the site).
    75
    argument does not answer the district court’s determination that delaying
    determination of the allocation issue “until after MPM is again engaged in PCB
    cleanup” would be “unjust” and “wasteful” because of the “considerable” cost
    and time that have been spent in litigating the case. MPM III, 
    2017 WL 6408611
    ,
    at *18 (“Determining allocation will save the litigants in this case substantial
    time and money . . . .”). Moreover, UCC does not challenge the district court’s
    determination that finalizing the issue of cost allocation — which, in its sensible
    view, it was fully capable of doing after the evidence presented at trial —
    would advance CERCLA’s ultimate goals. 
    Id.
     50
    As the district court pointed out, its declaration of liability for and
    allocation of MPM’s future response costs does not directly establish any
    50CERCLA requires the court to “enter a declaratory judgment on liability for response costs
    or damages that will be binding on any subsequent action or actions.” 
    42 U.S.C. § 9613
    (g)(2);
    see also Solvent Chemical, 
    664 F.3d at 25
     (noting that CERCLA requires “a declaratory judgment
    award dividing future response costs among responsible parties” (quoting Goodrich Corp. v.
    Town of Middlebury, 
    311 F.3d 154
    , 175 (2d Cir. 2002)); see also Dent v. Beazer Materials & Servs.,
    Inc., 
    156 F.3d 523
    , 531–32 (4th Cir. 1998) (“Even if multiple response costs actions exist or
    might exist, the court in the first action to reach decision [in liability] is required to enter
    judgment as to liability for the site.” (citing 
    42 U.S.C. § 9313
    (g)(2))). This requirement
    “ensure[s] that a responsible party’s liability, once established, [will] not have to be
    relitigated.” New York v. Green, 
    420 F.3d 99
    , 111 (2d Cir. 2005) (citation omitted). Moreover,
    we have said that “[t]he fact that future costs are somewhat speculative is no bar to a present
    declaration of liability.” 
    Id.
     (citation omitted).
    76
    financial liability. The court’s order “[left] open [] the issue of whether any costs
    MPM incurs in responding to PCBs are recoverable under CERCLA,” so that
    “if and when MPM brings an action to recover future removal costs, UCC will
    be entitled to raise appropriate objections.” MPM III, 
    2017 WL 6408611
    , at *18.51
    What the district court’s order did finalize was that, by reason of UCC’s sole
    responsibility for the substantial levels of PCB contamination at the Site, it is
    responsible (notwithstanding MPM’s delay) for 95% of the cost of any
    appropriate,      CERCLA-compliant            removals      designed       to   address      that
    contamination. As explained below, that conclusion was well supported by the
    record, and the district court was under no obligation to delay decision and
    require the parties to come back to court at some future date to litigate the
    allocation of financial responsibility for UCC’s pollution.
    c. Future removal cost allocation
    51See also Green, 
    420 F.3d at 111
     (noting that a party may raise objections to an action seeking
    recovery of CERCLA costs under a previously-issued declaratory judgment, including
    objections on the basis that the costs incurred were “inconsistent with the national
    contingency plan” or that the claimed costs were not actually incurred); Cadillac Fairview, 
    840 F.2d at 695
     (rejecting the argument that a declaration of liability for future costs would require
    the defendant to be “forced to pay for cleanup actions that are inadequate or ill-conceived”
    because, to recover costs under CERCLA, “the party undertaking the response action must
    prove that the costs it incurred were ‘necessary’ and that it incurred those costs in a manner
    ‘consistent with the national contingency plan’” (quoting 
    42 U.S.C. § 9607
    (a)(4)(B))).
    77
    UCC further argues that the district court’s decision to allocate 95% of
    MPM’s future removal costs to UCC was an abuse of discretion. UCC Br. at 58–
    70. The thrust of UCC’s argument is that the district court did not afford
    sufficient weight to several factors on which other courts have relied when
    making similar allocation determinations. UCC argues that the district court
    failed to take into account (a) that MPM assumed the risk of future cleanup
    costs by purchasing           the Site without         fully    investigating potential
    contamination there, 
    id.
     at 59–61, (b) that, by virtue of the documents MPM
    received before executing its purchase of the site, it was on objective notice of
    the PCB contamination, which should warrant a higher allocation to MPM
    under the doctrine of caveat emptor, 
    id.
     at 62–67, and (c) the possibility that
    “future PCB cleanups . . . could result in substantial economic benefits to
    MPM,” 
    id.
     at 68–69. 52
    52UCC also argues that the district court did not properly consider the “timeliness of future
    removal actions, MPM’s aggravation of contamination or proximate cause of removal costs,
    and MPM’s invocation or waiver of its indemnity from Crompton,” and that the district court
    improperly disregarded its argument that MPM’s planned cleanup work under its Soil
    Management Plan is motivated by “commercial” considerations and does not aim to
    permanently cleanup PCB contamination at the site. UCC Br. at 68–70.
    78
    A district court’s allocation of response costs under CERCLA is reviewed
    for abuse of discretion. Goodrich Corp. v. Town of Middlebury, 
    311 F.3d 154
    , 168–
    69 (2d Cir. 2002); see also United States v. Consolidation Coal Co., 
    345 F.3d 409
    , 412
    (6th Cir. 2003) (same). The allocation of CERCLA response costs is an
    “equitable determination based on the district court’s discretionary selection of
    the appropriate equitable factors in a given case.” Goodrich, 
    311 F.3d at 170
    . The
    statute does not require district courts to consider or give weight to any
    particular allocation factor, but rather permits the court to determine which
    factors are most relevant to a given case. NCR Corp. v. George A. Whiting Paper
    Co., 
    768 F.3d 682
    , 700 (7th Cir. 2014) (“[W]e have stressed that the district court’s
    discretion [in allocating CERCLA costs] is broad, both when it determines how
    much weight to place on any given equitable factor before the court, and also
    when it chooses which factors are pertinent at all for the case before it.”). 53
    53Courts often apply a set of factors taken from a document produced during the legislative
    debate over CERCLA, which include “the ability of the party to demonstrate that his
    contribution to the release [of a hazardous waste] can be distinguished [from the contribution
    of other parties],” “[t]he amount of hazardous waste involved,” “the degree of toxicity of
    hazardous substance involved,” “the degree of involvement of the person in the manufacture,
    treatment, transport, or disposal of the hazardous substance,” and “the degree of cooperation
    between the person and the Federal, State or local government in preventing harm to public
    health or the environment.” Niagara Mohawk Power Corp. v. Chevron U.S.A., Inc., 
    596 F.3d 112
    ,
    79
    UCC’s argument that the district court should have assigned more weight to
    certain allocation factors is therefore unavailing. UCC does not argue that the
    district court’s cost allocation “rests on an error of law (such as application of
    the wrong legal principle) or a clearly erroneous factual finding,” and it is clear
    that the court’s decision was “within the range of permissible decisions.”
    Goodrich, 
    311 F.3d at 169
    . Accordingly, we conclude that the district court did
    not abuse its discretion in allocating 95% of MPM’s future removal costs to
    UCC. By affirming the district court’s grant of declaratory judgment on future
    removal cost allocation, we do not imply, much less rule, that the district court
    would be barred from reconsidering its allocation on the basis of new events or
    discoveries that would make the present anticipatory allocation inappropriate.
    Nor does this discussion constitute a ruling that such reconsideration of the
    130 (2d Cir. 2010) (quoting S. Rep. No. 96–848, at 345–46 (1980)). However, as stated above,
    the statute “does not limit courts to any particular list of factors, nor does the [statute] direct
    the courts to employ any particular test.” Envtl. Transp. Sys., Inc. v. ENSCO, Inc., 
    969 F.2d 503
    ,
    507 (7th Cir. 1992).
    80
    allocation would be permitted. Our purpose is to leave the question open,
    expressing no view either way. 54
    C. CONCLUSION
    For the foregoing reasons, we VACATE the district court’s July 7, 2016
    grant of partial summary judgment holding that MPM’s claim for recovery of
    remediation costs is time-barred under 
    42 U.S.C. § 9613
    (g)(2), AFFIRM the
    district court’s September 22, 2017 order holding that UCC is liable to MPM for
    95% of future removal costs, and REMAND for further proceedings consistent
    with this order.
    54MPM also appeals from the district court’s September 22, 2017 order on the basis that the
    district court erred in failing to allocate future remedial action costs. MPM argues that, if this
    court concludes that its claims for recovery of remedial action costs are not time-barred, it
    should direct the district court to enter a judgment allocating the costs of any future remedial
    action according to the same allocation the district court applied to future removal costs in its
    September 22, 2017 order. MPM Br. at 54. We need not consider this argument because, while
    we hold that the district court’s analysis of the statute of limitations issue was flawed, we do
    not hold that MPM’s claims are necessarily timely, but instead remand to the district court
    for further consideration of that issue consistent with this opinion.
    81
    

Document Info

Docket Number: 17-3468(L)

Filed Date: 8/13/2020

Precedential Status: Precedential

Modified Date: 8/13/2020

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