United States v. CITGO Asphalt Ref. Co. (In Re Frescati Shipping Co., Ltd.) , 886 F.3d 291 ( 2018 )


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  •                                  PRECEDENTIAL
    UNITED STATES COURT OF APPEALS
    FOR THE THIRD CIRCUIT
    _____________
    No. 16-3470, 16-3552, 16-3867 & 16-3868
    _____________
    IN RE: PETITION OF FRESCATI SHIPPING
    COMPANY, LTD., AS OWNER OF THE M/T ATHOS
    I and TSAKOS SHIPPING & TRADING, S.A., AS
    MANAGER OF THE ATHOS I FOR EXONERATION
    FROM OR LIMITATION OF LIABILITY
    (E.D. Pa. No. 2-05-cv-00305)
    UNITED STATES OF AMERICA
    v.
    CITGO ASPHALT REFINING COMPANY; CITGO
    PETROLEUM CORPORATION; CITGO EAST
    COAST CORPORATION
    (E.D. Pa. No. 2-08-cv-02898)
    CITGO Asphalt Refining Company; CITGO Petroleum
    Corporation; CITGO East Coast Oil Corporation,
    Appellants in Nos. 16-3470; 16-3552
    Frescati Shipping Company, Ltd.; Tsakos Shipping and
    Trading, S.A.,
    Appellants in No. 16-3867
    United States of America
    Appellant in No. 16-3868
    _____________
    On Appeal from the United States District Court
    for the Eastern District of Pennsylvania
    District Court Nos. 2-05-cv-00305; 2-08-cv-02898
    District Judge: The Honorable Joel H. Slomsky
    Argued November 8, 2017
    Before: SMITH, Chief Judge, HARDIMAN,
    Circuit Judge, and BRANN, District Judge*
    (Filed: March 29, 2018)
    Timothy J. Bergère        [ARGUED]
    Alfred J. Kuffler
    John J. Levy              [ARGUED]
    Montgomery McCracken Walker & Rhoads
    *
    The Honorable Matthew W. Brann, United States District
    Judge for the Middle District of Pennsylvania, sitting by
    designation.
    2
    123 South Broad Street
    24th Floor
    Philadelphia, PA 19109
    Eugene J. O’Connor
    Montgomery McCracken Walker & Rhoads
    437 Madison Avenue
    29th Floor
    New York, NY 20022
    Jack A. Greenbaum
    22782 Buendia
    Mission Viejo, CA 92691
    Counsel for Frescati Shipping Co. Ltd. and
    Tsakos Shipping and Trading S.A.
    Matthew M. Collette
    United States Department of Justice
    Civil Division
    Room 7212
    950 Pennsylvania Avenue, N.W.
    Washington, DC 20530
    Stephen G. Flynn
    United States Department of Justice
    Torts Branch, Civil Division
    P.O. Box 14271
    Washington, DC 20044
    Anne Murphy                    [ARGUED]
    United States Department of Justice
    3
    Appellate Section
    Room 7644
    950 Pennsylvania Avenue, N.W.
    Washington, DC 20530
    Counsel for United States of America
    Benjamin Beaton
    Jacqueline G. Cooper
    Carter G. Phillips             [ARGUED]
    Richard E. Young
    1501 K Street, N.W.
    Washington, DC 20005
    Counsel for Citgo Asphalt Refining Co.
    Citgo Petroleum Corp.
    Citgo East Coast Oil Corp.
    George R. Zacharkow
    Deasey Mahoney & Valentini
    1601 Market Street
    Suite 3400
    Philadelphia, PA 19103
    Counsel for Intervenor Respondent
    International Liquid Terminal Ass’n
    American Fuels and Petrochemicals
    Manufacturers Ass’n
    4
    ________________
    OPINION
    ________________
    SMITH, Chief Judge.
    Table of Contents
    I.    Introduction .......................................................... 6
    II.   Background........................................................... 7
    a.   Facts ................................................................... 7
    b.   Procedural History ......................................... 13
    III.  Jurisdiction and Standard of Review ............... 19
    IV.   The Safe Berth Warranty .................................. 19
    a.   The Draft of the Athos I ................................. 21
    b.   Frescati’s Seamanship ................................... 27
    V.    Wharfinger Negligence ...................................... 36
    VI.   Subrogation and Equitable Recoupment......... 42
    a.   Subrogation and Subrogee-Specific
    Defenses ........................................................... 45
    b.    Equitable Recoupment .................................. 49
    VII. Limitation of Liability under the Oil Pollution
    Act ........................................................................ 55
    VIII. Prejudgment Interest Rate ................................ 58
    IX. Conclusion........................................................... 61
    5
    I.   Introduction
    After a 1,900-mile journey from Venezuela to
    Paulsboro, New Jersey, the M/T Athos I, a single-hulled
    oil tanker, had come within 900 feet of its intended berth
    when it struck an abandoned anchor on the bottom of the
    Delaware River. The anchor pierced the Athos I’s hull,
    causing approximately 264,000 gallons of crude oil to spill
    into the river.
    The cost of cleaning up the spill was $143 million.
    We are presented with the question of how to apportion
    responsibility for that cost between three parties. The first
    party comprises not only the shipowner, Frescati Shipping
    Company, Ltd., but also the ship’s manager, Tsakos
    Shipping & Trading, S.A. (collectively, “Frescati”).
    Frescati, through an intermediary, contracted to deliver
    crude oil to the second party, which is made up of several
    affiliated    companies—CITGO          Asphalt      Refining
    Company, CITGO Petroleum Corporation, and CITGO
    East Coast Oil Corporation (collectively, “CARCO”). The
    oil shipment was to be delivered to CARCO at its marine
    terminal in Paulsboro. After the oil spill, Frescati paid for
    the cleanup effort, and was eventually reimbursed $88
    million by the third party to this litigation, the United
    States, pursuant to the Oil Pollution Act (OPA) of 1990,
    
    33 U.S.C. § 2701
     et seq. Frescati and the United States
    now seek to recover their cleanup costs from CARCO.
    6
    II.     Background
    a. Facts1
    The M/T Athos I was a single-hulled tanker ship,
    measuring approximately 748 feet long and 105 feet
    wide.2 As owner of the ship, Frescati chartered it to an
    intermediary which assigned it to a tanker pool. CARCO
    sub-chartered the Athos I from the tanker pool to deliver a
    shipment of crude oil from Puerto Miranda, Venezuela, to
    CARCO’s berth in Paulsboro, New Jersey. CARCO was
    the shipping customer as well as the wharfinger who
    operated the berth.
    The Athos I, carrying CARCO’s shipment, left
    Venezuela in mid-November 2004 under the command of
    the ship’s master, Captain Iosif Markoutsis. CARCO had
    1
    The facts are undisputed unless otherwise noted.
    2
    Single-hulled tanker ships drew the attention of
    regulators and the public in the wake of the 1989 Exxon
    Valdez oil spill off the Alaskan coast; the Exxon Valdez,
    like the Athos I, was a single-hulled tanker. Single-hulled
    ships were initially subjected to extra regulation, see, e.g.,
    
    33 C.F.R. § 157.455
    , but have since been phased out of
    operation in the United States in favor of double-hulled
    ships. See 46 U.S.C. § 3703a.
    7
    instructed the Athos I to load to a draft3 of 37 feet or less
    in Venezuela, and provided a warranty that the ship would
    be able to safely reach the berth in Paulsboro as long as it
    arrived with a draft of 37 feet or less. When the Athos I left
    Venezuela, it had a draft of 36′ 6″. Over the course of the
    Athos I’s journey, the ship burned fuel and the crew
    consumed fresh water. As the ship grew lighter, it rode
    higher on the water. By the time it reached the entrance to
    the Delaware Bay, the Athos I was drawing 36′ 4″.
    Because the fuel and fresh water were consumed from
    tanks located in the stern, or rear, of the ship, the Athos I
    was no longer sailing at an even keel; it was “trimmed by
    the bow,” meaning that the bow, or front of the ship, was
    deeper in the water than the ship’s stern. To return the ship
    to an even keel, the Athos I took on approximately 510
    metric tons of ballast to tanks in the rear of the ship.
    Although the parties dispute how much the Athos I was
    drawing as it approached CARCO’s berth, the District
    Court found that the added ballast brought the ship’s draft
    to 36′ 7″.
    The Athos I reached the entrance to the Delaware
    Bay without incident on November 26th. All vessels
    3
    A ship’s draft is the measurement from the water line to
    the bottom of the ship’s hull, known as the keel. As a ship
    loads cargo, it becomes heavier and sits lower in the water.
    Its draft thereby increases.
    8
    traveling north from the Delaware Bay to the Delaware
    River are required to use a Delaware River Pilot to
    navigate the waters. At the appropriate time, a local river
    pilot, Captain Howard Teal, Jr. boarded the ship and
    guided it up the Delaware River until it reached a section
    of the river near CARCO’s berth. At that point, a local
    docking pilot, Captain Joseph Bethel, replaced Captain
    Teal and began to navigate the ship to its berth at
    Paulsboro. Captains Teal and Bethel both engaged Captain
    Markoutsis in conversations about the Athos I, its passage
    from the Delaware Bay to the Paulsboro berth, water
    depth, underkeel clearance, and other local conditions.
    The substance and sufficiency of those conversations are
    disputed by the parties.
    CARCO’s berth is on the New Jersey side of the
    Delaware River, directly across from Philadelphia
    International Airport. To reach the berth from the main
    river channel, ships must pass through an anchorage
    immediately adjacent to the berth. The anchorage, known
    as Federal Anchorage Number 9 or the Mantua Creek
    Anchorage, is a federally-designated section of the river in
    which ships may anchor; it is periodically surveyed for
    depth and dredged by the Army Corps of Engineers, as
    Corps resources allow. No government agency is
    responsible for preemptively searching for unknown
    obstructions to navigation in the anchorage, although the
    Coast Guard, the National Oceanic and Atmospheric
    9
    Administration (NOAA), and the Corps of Engineers work
    together to remove or mark obstructions when they are
    discovered. Anyone who wishes to search for obstructions
    in the anchorage may do so, but anyone wishing to dredge
    in the anchorage requires a permit from the Corps of
    Engineers.
    It was in this anchorage on November 26, 2004, at
    9:02 p.m., that the allision occurred.4 The Athos I was only
    900 feet—not much more than the ship’s length—from
    CARCO’s berth. The ship was “just about dead in the
    water” as Captain Bethel slowly positioned it to dock.
    Suddenly, the ship began to list and oil appeared in the
    river. At the time of the allision, the ship was in the middle
    of a 180° rotation, guided by tugboats, and moving astern
    and to port (backwards and to the ship’s left). The path
    taken by the Athos I through the anchorage passed, at its
    shallowest point, over a 38-foot shoal. Most of the
    anchorage was deeper, and the depth of the river at the site
    of the allision was at least 41.65 feet at the time.
    Captain Bethel immediately called the Coast Guard
    to alert them to the spill, while Captain Markoutsis rushed
    to the engine room and transferred oil from the breached
    4
    An allision is “[t]he contact of a vessel with a stationary
    object such as an anchored vessel or a pier.” Allision,
    BLACK’S LAW DICTIONARY (10th ed. 2014).
    10
    cargo tank into another tank. The crew of the Athos I was
    eventually able to stop the leak, but not before 264,321
    gallons of crude oil had spilled into the Delaware River.
    The cleanup effort began almost immediately.
    Although it was ultimately successful, it took months to
    complete and the efforts of thousands of workers at a cost
    of $143 million. The cause of the allision was not
    discovered until more than a month later, when an
    abandoned anchor was discovered on the riverbed. The
    search for the obstruction that caused the allision proved
    difficult. An experienced sonar operator using side-scan
    sonar conducted the first search shortly after the allision,
    but did not recognize the anchor.5 A second search by the
    5
    Side-scan sonar is used to locate objects on the sea floor
    and works like a camera, but using sound instead of light
    to form an image. Single-beam sonar, by contrast, uses
    sound to measure the depth along a single line traced by a
    sounding mechanism known as a towpath. If an
    obstruction is not located along the towpath, it would not
    be detected, and even if the towpath crossed an
    obstruction, the data would simply show a depth change
    rather than the obstruction itself. Before the allision,
    CARCO used single-beam sonar to survey its berthing
    area and a small portion of the anchorage. The government
    typically used single-beam sonar when it surveyed the
    anchorage for depth and dredging purposes.
    11
    same operator, conducted several weeks later, eventually
    discovered the anchor with the use of side-scan sonar in
    combination with divers and magnetometers. The anchor
    weighed approximately nine tons and was 6′ 8″ long, 7′ 3″
    wide, and 4′ 6″ high. It has since been removed from the
    river.
    The parties dispute the positioning of the anchor at
    the time of the allision. An anchor like the one that
    punctured the Athos I has two stable positions. It can sit at
    rest in the “flukes-up” or “flukes-down” position. A
    flukes-up anchor stands almost upright on its crown, with
    the flukes pointed upward at a 65° angle, while a flukes-
    down anchor has essentially tipped over, with both the
    crown and flukes of the anchor lying horizontally on the
    riverbed. In the flukes-up position, the anchor sticks up
    approximately seven feet above the riverbed, but in the
    flukes-down position, it rises only about 3′ 5″ above the
    riverbed. The District Court found that the anchor was
    flukes-up at the time of the allision, but CARCO asserts
    that the anchor was flukes-down, pointing to side-scan
    sonar data gathered as part of a geophysical study of the
    Delaware River that showed the anchor was flukes-down
    in 2001, three years before the allision.6 The anchor was
    6
    The anchor was identified in the geophysical study data
    only after the allision occurred. The parties agree that in
    2001, the anchor was flukes-down, and that no one was
    12
    also flukes-down when it was discovered after the allision.
    Between 2001 and the allision in 2004, 241 vessels went
    to CARCO’s Paulsboro berth, and many others have
    anchored in the anchorage over the years. The District
    Court theorized that one of those anchored ships could
    have dragged its own anchor chain along the riverbed,
    catching on the abandoned anchor and shifting its position.
    The court ultimately concluded that although the actual
    cause of the anchor’s movement would never be known,
    at some point between the geophysical study in 2001 and
    the allision in 2004, the anchor shifted from flukes-down
    to flukes-up. A flukes-down anchor would not have allided
    with the Athos I if the Athos I’s draft was less than 37 feet;
    a flukes-up anchor would have.
    Now, more than thirteen years after the allision, the
    Athos I has been scrapped, the anchor removed from the
    river, and the oil spill cleaned up. What remains is this case
    for apportionment of cleanup costs.
    b. Procedural History
    This case, like the Athos I, has been on a long
    journey. Over the past thirteen years, the matter has been
    to trial before two different judges and heard on appeal
    aware of the anchor’s existence before the allision—
    except, perhaps, the still-unidentified owner who
    abandoned it.
    13
    before two separate panels of this Court. We briefly
    summarize that history.
    Litigation began shortly after the allision in January,
    2005, when Frescati filed a “Petition for Exoneration from
    or Limitation of Liability.” CARCO and others filed
    claims for damages associated with the spill. Frescati then
    filed a counterclaim against CARCO for its damages. The
    United States eventually reimbursed Frescati for some of
    its cleanup expenses pursuant to the OPA, and filed suit
    against CARCO as a partial subrogee to some of Frescati’s
    claims. The claims of Frescati and the United States
    against CARCO were consolidated with CARCO’s
    counterclaims and defenses, forming the litigation as it
    exists today.
    The case was first tried in a forty-one-day bench
    trial before the Honorable John P. Fullam. Judge Fullam
    found that CARCO was not liable for the casualty in
    contract, tort, or otherwise; Frescati and the United States
    appealed. On appeal, we affirmed in part, vacated in part,
    and remanded the case because the District Court had
    failed to make appropriate findings of fact and conclusions
    of law as required by Fed. R. Civ. P. 52(a)(1). In re
    Frescati, 
    718 F.3d 184
    , 189, 196–97 (3d Cir. 2013).
    We determined, among other things, that Frescati
    was a third-party beneficiary of CARCO’s safe berth
    warranty, and that the allision occurred in the approach to
    14
    CARCO’s terminal, meaning that CARCO had an
    unspecified duty of care to Frescati in tort. We remanded
    for the District Court to determine whether Frescati met
    the conditions for the safe berth warranty to apply. We also
    asked the District Court, if necessary, to determine the
    appropriate duty of care CARCO owed Frescati and
    whether CARCO breached that duty. 718 F.3d at 214–15.
    Judge Fullam retired before the case was remanded.
    Upon its return to the District Court, the case was assigned
    to the Honorable Joel H. Slomsky as a successor judge
    pursuant to Fed. R. Civ. P. 63. Under the terms of that rule,
    Judge Slomsky certified his familiarity with the record and
    recalled more than twenty witnesses over the course of a
    thirty-one-day proceeding.
    The District Court held that CARCO was liable to
    Frescati, and the United States as Frescati’s subrogee, for
    breach of contract. CARCO’s contract included a
    provision known as a safe berth warranty, which, for
    purposes of this appeal, warrantied that CARCO’s berth
    would be safe for the Athos I as long as the ship had a draft
    of 37 feet or less and Frescati did not cause the allision
    through bad navigation or negligent seamanship. The
    District Court concluded that CARCO breached the
    warranty because the Athos I had a draft of 36′ 7″ at the
    time of the allision, exercised good navigation and
    seamanship, and yet still hit an anchor within the
    geographic area covered by the warranty. On appeal,
    15
    CARCO argues that the Athos I had a draft much deeper
    than the warrantied depth of 37 feet, and that Frescati
    demonstrated negligent seamanship by violating several
    federal maritime regulations relating to underkeel
    clearance and safe navigation.
    The District Court also found CARCO liable in tort
    to Frescati,7 concluding that CARCO had a duty, as
    operator of the berth, to search for obstructions in the
    approach to its berth. Specifically, the District Court
    concluded that CARCO had a duty to use side-scan sonar
    to search for unknown obstructions to navigation in the
    approach to its berth, and to remove any such obstructions
    or warn invited ships—like the Athos I—of their presence.
    Because CARCO had not taken any action to search for
    obstructions, the District Court held CARCO liable in
    tort—for the same amount for which it was liable in
    contract. The District Court’s contract and tort holdings
    independently support the judgment for Frescati.
    CARCO, in a motion for partial summary judgment
    before the District Court, asked that its liability, like
    Frescati’s, be limited under the OPA. Because CARCO
    did not raise the defense until after the first trial and
    7
    The United States is not a party to the tort claim, pursuant
    to a partial settlement agreement it reached with CARCO
    in 2009.
    16
    appeal, almost a decade into this litigation, the District
    Court held that the defense was waived, and in the
    alternative, that it failed on the merits.
    The District Court did, however, partially credit
    CARCO’s equitable recoupment defense against the
    United States. CARCO argued that the conduct of three
    federal agencies—the Coast Guard, NOAA, and the Army
    Corps of Engineers—misled CARCO into believing that
    the United States was maintaining the anchorage free of
    obstructions. In addition, CARCO argued that equity
    requires the United States to bear the cost of the cleanup
    rather than CARCO. The District Court ultimately reduced
    the United States’ recovery against CARCO by 50%,
    rather than acceding to CARCO’s request to eliminate its
    liability entirely.
    Finally, the District Court held that Frescati was
    entitled to prejudgment interest at the federal
    postjudgment rate rather than the higher U.S. prime rate
    requested by Frescati.
    The District Court ultimately awarded Frescati
    $55,497,375.958 on the claims of breach of contract and
    8
    Frescati’s liability under the OPA for the cost of cleaning
    up the spill was limited to approximately $45 million. The
    United States reimbursed it for the remaining $88 million
    of its qualifying cleanup expenses. In addition to the $45
    17
    negligence, plus prejudgment interest of $16,010,773.75,
    for a total judgment of $71,508,149.70. The United States,
    after the court’s 50% reduction, was awarded
    $43,994,578.66 on its subrogated breach of contract claim,
    with prejudgment interest of $4,620,159.98, for a total
    judgment of $48,614,738.64.
    All three parties now appeal. We will affirm the
    District Court’s judgment in favor of Frescati on the
    breach of contract claim and the prejudgment interest
    award, as well as the District Court’s denial of CARCO’s
    motion for partial summary judgment on its limitation of
    liability defense. We will vacate the District Court’s
    judgment in favor of Frescati on the negligence claim. We
    will affirm in part the District Court’s judgment in favor
    of the United States with respect to CARCO’s liability on
    the subrogated breach of contract claim, but because
    million in OPA damages, Frescati also incurred roughly
    $10 million in damages that fell outside the scope of the
    OPA’s liability cap—third-party claims; cleanup expenses
    for recreational boats; the cost of removing the anchor and
    the pump casing from the riverbed; a settlement with a
    nearby nuclear power plant that had to shut down;
    unrepaired hull damage to the Athos I, and other
    miscellaneous expenses. Frescati’s contract recovery of
    $55 million was based on both its OPA and non-OPA
    damages.
    18
    CARCO’s equitable recoupment defense fails, we will
    reverse and remand for further proceedings to recalculate
    damages and prejudgment interest.
    III.   Jurisdiction and Standard of Review
    The District Court had admiralty jurisdiction
    pursuant to 
    28 U.S.C. § 1333
    (1). We have jurisdiction
    over this appeal under 
    28 U.S.C. § 1291
    .
    “On appeal from a bench trial, we review a district
    court’s findings of facts for clear error and exercise
    plenary review over conclusions of law.” Norfolk S. Ry.
    Co. v. Pittsburgh & W. Va. R.R., 
    870 F.3d 244
    , 253 (3d
    Cir. 2017). “A finding of fact is clearly erroneous when it
    is completely devoid of minimum evidentiary support
    displaying some hue of credibility or bears no rational
    relationship to the supportive evidentiary data.” VICI
    Racing, LLC v. T-Mobile USA, Inc., 
    763 F.3d 273
    , 283 (3d
    Cir. 2014); In re Frescati, 718 F.3d at 196.
    IV.    The Safe Berth Warranty
    CARCO promised that the Athos I would be
    directed to a location “she may safely get (always afloat),”
    a promise known as a safe port or safe berth warranty. JA
    at 1211. Such a promise provides, among other things,
    “protection against damages to a ship incurred in an unsafe
    port to which the warranty applies.” In re Frescati, 718
    F.3d at 197.
    19
    A port is deemed safe where the particular
    chartered vessel can proceed to it, use it, and
    depart from it without, in the absence of
    abnormal weather or other occurrences,
    being exposed to dangers which cannot be
    avoided by good navigation and seamanship.
    Whether a port is safe refers to the particular
    ship at issue, and goes beyond the immediate
    area of the port itself to the adjacent areas the
    vessel must traverse to either enter or leave.
    In other words, a port is unsafe—and in
    violation of the safe berth warranty—where
    the named ship cannot reach it without harm
    (absent abnormal conditions or those not
    avoidable by adequate navigation and
    seamanship).
    Id. at 200 (quotations and citations omitted). “[T]he safe
    berth warranty is an express assurance made without
    regard to the amount of diligence taken by the charterer.”
    Id. at 203. For our purposes, a safe berth warranty
    promises that a ship with a draft less than the warrantied
    depth is covered by the warranty in the absence of bad
    navigation or negligent seamanship.
    Our prior opinion called for the District Court to
    resolve three issues on remand: the draft limit beyond
    which the safe berth warranty would not apply; the actual
    draft of the Athos I at the time of the allision; and whether
    20
    the warranty was negated by bad navigation or negligent
    seamanship. Id. at 204–05, 204 n.20.
    As an initial matter, the District Court found that the
    safe berth warranty applied to ships drawing less than 37
    feet, a finding neither party challenges on appeal. The
    remaining issues, then, are whether the Athos I had a draft
    of less than 37 feet, and if it did, whether bad navigation
    or negligent seamanship by Frescati negated the warranty.
    a. The Draft of the Athos I
    The District Court found that the Athos I had a draft
    of 36′ 7″ at the time of the allision. The court based this
    finding on the undisputed draft of the Athos I at the time
    of its departure from Puerto Miranda—36′ 6″—as well as
    expert testimony regarding the condition of the ship and
    its estimated draft at Paulsboro.9
    9
    Frescati’s expert, Anthony Bowman, developed the
    Seamaster software program, which allows him to enter
    the measurements of a ship—including the weight,
    dimensions, and strength of all its constituent parts, such
    as the hull, cargo, and supplies—and calculate, among
    other things, a ship’s draft. Having considered the ship’s
    records, information about the ballast tanks, and his own
    software, Bowman testified that at the time of the allision,
    21
    CARCO challenges the District Court’s
    determination of the Athos I’s draft, arguing that the
    District Court improperly based its finding on a
    speculative assumption about the orientation of the
    abandoned anchor. Specifically, CARCO disputes the
    District Court’s finding that the anchor shifted from a
    flukes-down position to a flukes-up position sometime
    between 2001 and the allision in 2004, a shift that caused
    the anchor to intrude within the 37-foot safe depth
    promised by CARCO. CARCO argues that the District
    Court failed to make a finding as to the precise mechanism
    by which the anchor shifted from flukes-down to flukes-
    up. The anchor’s orientation matters; if the accident
    occurred while the anchor was flukes-down, the Athos I
    necessarily would have had a draft that exceeded the scope
    of CARCO’s warranty.10
    the Athos I had a draft of 36′ 7″. The District Court
    credited his testimony.
    10
    The District Court made undisputed findings of fact as
    to the height of the anchor in a flukes-down position (41
    inches or 3.42 feet) and the depth of the river at the time
    and location of the allision (41.65 feet). Assuming for the
    moment that the anchor was flukes-down, as CARCO
    argues, the allision would not have occurred unless the
    Athos I had a draft of at least 38.23 feet, or just under
    22
    Broadly speaking, the District Court made three
    findings of fact related to the anchor’s orientation. First,
    the court and parties agree that, three years before the
    allision, the anchor was in the flukes-down position.11
    Second, the District Court found that at some point before
    the allision, the anchor shifted into the flukes-up position.
    Finally, after the allision, the anchor was eventually
    discovered back in the flukes-down position—perhaps
    unsurprising, given the force of its encounter with the
    Athos I.
    CARCO attacks the second finding, arguing that
    there was insufficient evidence in the record to support the
    District Court’s suggestion that a “sweeping anchor chain”
    could have caught the anchor and shifted it into the flukes-
    up position.12
    38′ 3″, significantly in excess of the warrantied draft of 37
    feet.
    11
    Experts for both sides were able to identify the flukes-
    down anchor in a sonar scan performed in 2001 as part of
    an independent geophysical study.
    12
    Ships at anchor move with the tide, back and forth as the
    tide comes in and goes out. The anchor chain drags or
    “sweeps” across the riverbed as the ship floats, potentially
    shifting the position of objects on the riverbed, and leaving
    scour marks on the riverbed. Anchor chains also move
    23
    We find CARCO’s arguments unconvincing,
    primarily because the “sweeping anchor chain” theory,
    however plausible or implausible, is not necessary to
    sustain the District Court’s finding. Let us imagine a piece
    of furniture (a sofa, perhaps, or an armchair) that has fallen
    off the back of a pickup truck onto a roadway. One driver
    reports seeing the furniture in the right lane. A while later,
    a second driver hits the furniture. The second driver asserts
    that the furniture was in the left lane when he struck it, and
    provides evidence to that effect. A highway patrolman
    along the river bottom when the anchor is pulled back onto
    the ship. CARCO, for its part, characterizes the idea that
    an anchor chain might have moved the abandoned anchor
    as “fantastical,” “inexplicabl[e],” an “astonishing
    assertion,” “facially implausible,” “pure and wild
    speculation,”      “pure     speculation,”     “conjecture,”
    “speculative and unsupported,” and, once again,
    “implausible.” CARCO Opening Br. 4, 53–55; CARCO
    Reply Br. 32. The District Court pointed out that scour
    marks were found on the river bottom near the site of the
    allision, but ultimately decided only that the anchor was in
    the flukes-up position at the time of the allision. JA at 78
    (“Although the actual cause of the anchor’s movement to
    a ‘flukes-up’ position will never be known, the Court finds
    that at some point after December 2001, this movement
    occurred and the anchor was positioned in a ‘flukes-up’
    orientation when it allided with the Athos I.”).
    24
    shows up later and finds the furniture once again in the
    right lane. A court may find, without committing error,
    that the furniture was in the right lane and moved to the
    left without making a specific finding as to the precise
    method by which the furniture moved from one lane to the
    other. Perhaps another driver hit it; perhaps a pedestrian
    tried to move it out of the road but did not finish the job.
    When credible evidence shows that the second driver was
    driving in the left lane, a finding to that effect does not
    become error because the furniture was in the right lane
    when the first driver passed, or changed position after—or
    because of—the encounter with the second driver.
    Here, the record contains sufficient evidence to
    support the finding that the anchor was, in fact, flukes-up
    at the time of the allision. How exactly the anchor changed
    position does not impact our sufficiency determination. As
    an initial matter, the movement of the Athos I at the time
    of the allision and the damage to its hull are sufficient to
    show that the anchor was flukes-up. And substantial
    evidence unrelated to the anchor showed that the Athos I
    was drawing 36′ 7″ at the time of the allision—a draft at
    which the allision would not have occurred had the anchor
    been flukes-down. That is enough to support the District
    Court’s finding that the anchor moved from flukes-down
    to flukes-up.
    The movement of the ship and damage to its hull
    shows that the anchor must have been flukes-up. The
    25
    District Court found that the Athos I was moving astern
    and to port at the time of the allision, a finding CARCO
    does not challenge. Based on that movement, the scoring
    left by the anchor on the hull, the size and shape of the two
    holes the anchor created, and the damage to the anchor
    itself also supported the District Court’s finding that the
    anchor must have been flukes-up at the time of the allision.
    CARCO’s own expert witness, on cross-examination,
    testified that if the Athos I were moving astern and to port,
    the damage to the Athos I’s hull would necessarily require
    a flukes-up anchor.13 JA at 1021–22.
    Nor did the District Court base its finding of a 36′ 7″
    draft on the flukes-up anchor alone. While CARCO argues
    that the anchor was flukes-down, and that therefore the
    Athos I must have had a deep draft, the reverse is also true.
    If the Athos I had a draft of 36′ 7″, then the anchor must
    have been flukes-up. The District Court credited expert
    testimony that the ship had a 36′ 7″ draft. The ballast tanks
    contained no extra liquid that would have affected the
    ship’s draft, a finding that CARCO does not challenge on
    appeal. The ship left Puerto Miranda with a draft of 36′ 6″.
    Visual observation of the ship by experts and
    crewmembers immediately after the allision suggested the
    Athos I had a 36′ 7″ draft before the allision. And, on
    13
    CARCO’s theory at trial, abandoned on appeal, was that
    the ship was not moving astern and to port.
    26
    appeal, CARCO fails to offer any suggestion as to how the
    draft might have increased by more than a foot without the
    crew’s knowledge or any evidence that the ballast tanks
    were faulty.14
    We conclude there was no clear error in the District
    Court’s determination that the Athos I had a draft of 36′ 7″
    at the time of the allision. The ship was, therefore, within
    the scope of CARCO’s safe berth warranty.
    b. Frescati’s Seamanship
    A safe berth warranty applies only in the absence of
    bad navigation or negligent seamanship. CARCO argues
    on appeal that Frescati violated several maritime
    regulations related to the operation of single-hulled
    tankers, and that those regulatory violations serve as
    sufficient proof of negligent seamanship. The District
    Court concluded that Frescati did not violate any relevant
    regulations, and enforced the safe berth warranty. We
    14
    The Athos I passed safely over a 38-foot shoal less than
    fifteen minutes before the allision. JA at 203. It seems that
    if the Athos I had a draft deep enough to hit the flukes-
    down anchor (a minimum of 38.23 feet, see supra note 10),
    it would have encountered the 38-foot shoal before it ever
    encountered the anchor. A flukes-down anchor would
    have been deeper than the 38-foot shoal even at the
    anchor’s shallowest point. JA at 77, 78, 85.
    27
    agree with the District Court that Frescati did not violate
    any relevant regulations.
    On appeal, CARCO argues specifically that Frescati
    violated two federal regulations: 
    33 C.F.R. § 157.455
     and
    
    33 C.F.R. § 164.11
    . Section 157.455 applied to certain
    single-hulled tankers during the period they were being
    phased out of operation, while § 164.11 applies to certain
    ships above 1,600 gross tons. 
    33 C.F.R. §§ 157.400
    ,
    164.01. Both sections applied to the Athos I at the time of
    the allision.
    Section 157.455 requires the owner or operator of a
    single-hulled tanker to provide certain written guidance to
    the ship’s master for purposes of estimating the tanker’s
    underkeel clearance.15 
    33 C.F.R. § 157.455
    (a). It also
    15
    
    33 C.F.R. § 157.455
    (a)–(b) reads:
    (a) The owner or operator of a tankship, that
    is not fitted with a double bottom that
    covers the entire cargo tank length, shall
    provide the tankship master with written
    under-keel clearance guidance that
    includes—
    (1) Factors to consider when
    calculating the ship’s deepest
    navigational draft;
    28
    (2) Factors to consider when
    calculating the anticipated
    controlling depth;
    (3) Consideration of weather or
    environmental conditions; and
    (4) Conditions which mandate
    when the tankship owner or
    operator shall be contacted
    prior to port entry or getting
    underway; if no such
    conditions exist, the guidance
    must contain a statement to
    that effect.
    (b) Prior to entering the port or place of
    destination and prior to getting underway,
    the master of a tankship that is not fitted
    with the double bottom that covers the
    entire cargo tank length shall plan the
    ship’s passage using guidance issued
    under paragraph (a) of this section and
    estimate the anticipated under-keel
    clearance. The tankship master and the
    pilot shall discuss the ship’s planned
    transit including the anticipated under-
    keel clearance. An entry must be made in
    the tankship’s official log or in other
    29
    requires the master to use that guidance to plan the ship’s
    passage, estimate the underkeel clearance, consult with the
    relevant pilots who will guide the ship to its berth, and
    make a log entry reflecting discussion of the ship’s
    underkeel clearance with the pilot. 
    33 C.F.R. § 157.455
    (b). Section 164.11 mandates that the master
    ensure the pilot is informed of certain information,
    including the ship’s draft and tidal conditions.16 
    33 C.F.R. § 164.11
    .
    onboard    documentation  reflecting
    discussion of the ship’s anticipated
    passage.
    
    33 C.F.R. § 157.455
    (a)–(b).
    16
    
    33 C.F.R. § 164.11
     reads:
    The owner, master, or person in charge of each
    vessel underway shall ensure that:
    ....
    (k) If a pilot other than a member of the
    vessel’s crew is employed, the pilot is
    informed of the draft, maneuvering
    characteristics, and peculiarities of the
    vessel and of any abnormal circumstances
    on the vessel that may affect its safe
    navigation.
    30
    CARCO argues that Frescati was responsible for
    three specific violations, each of which allegedly caused
    the allision. First, CARCO claims that Frescati failed to
    adequately plan the ship’s passage. Second, CARCO
    claims that Frescati failed to estimate the Athos I’s
    underkeel clearance. Finally, CARCO claims that Frescati
    failed to ensure that an adequate master-pilot exchange
    occurred, and made no log entry that would reflect such an
    exchange.
    With respect to planning the passage, CARCO
    argues that 
    33 C.F.R. § 157.455
     requires a written voyage
    plan. Frescati allegedly violated that requirement by
    failing to finalize an official voyage plan document using
    the Tsakos Voyage Plan form contained in the Tsakos
    Vessel Operation Procedures Manual. See JA at 1178–85.
    The text of § 157.455 undermines CARCO’s
    argument. The regulation does not itself require a written
    voyage plan. Paragraph (a) of the regulation requires that
    Frescati create “written under-keel clearance guidance,”
    which must contain “factors to consider” when evaluating
    ...
    (n) Tidal state for the area to be transited is
    known by the person directing movement
    of the vessel . . . .
    
    33 C.F.R. § 164.11
    .
    31
    draft, water depth, and weather conditions. Paragraph (b)
    requires that the master plan the ship’s passage using those
    “factors to consider” in the guidance required by
    paragraph (a). Nowhere does this regulation require that
    the master’s passage plan be in writing; the only reference
    to a writing in paragraph (b) comes in the requirement that
    some official log of the master-pilot conference be
    recorded. CARCO conflates the passage plan requirement
    of paragraph (b)—to consider certain relevant factors
    when planning—with the “Voyage Plan” form contained
    in Frescati’s Vessel Operation Procedures Manual. See JA
    at 1180. The Voyage Plan form focuses on plotting the
    course of the vessel from berth to berth; paragraphs (a) and
    (b) of the regulation, on the other hand, serve to create a
    reference list for the ship’s master of relevant factors to
    consider when estimating underkeel clearance.
    Frescati satisfied the requirements of paragraph (a)
    by providing written underkeel clearance guidance in
    Section 3.417 of its Vessel Operation Procedures Manual.
    JA at 1191. The Manual appropriately lists factors to
    consider, including “sea state and swell,” “tidal
    17
    The Vessel Operation Procedures Manual appears to
    contain a typographical error listing the appropriate
    section as 2.4 rather than 3.4, as it appears in the Table of
    Contents. See JA at 1189, 1191.
    32
    conditions,” and “the effect of squat,”18 and suggests to the
    master that 10% or 5% underkeel clearance margins would
    typically be appropriate. 
    Id.
    Furthermore, Frescati satisfied the planning
    requirement of paragraph (b) because the Athos I’s master,
    Captain Markoutsis, considered factors like the sea state,
    tidal condition, and the effect of squat. Even though
    CARCO provided a safe berth warranty for a draft up to
    37 feet, Captain Markoutsis loaded the ship to only 36′ 6″
    because he was “afraid” of a 37-foot draft, and eventually
    entered the Delaware River with a draft of 36′ 7″. In re
    Frescati, 718 F.3d at 204. The charts in the Athos I were
    marked with the 38-foot controlling draft in the anchorage.
    JA at 992. Captain Teal, the river pilot, testified that he
    and Captain Markoutsis discussed the draft, wind,
    visibility, and tides. We agree with the District Court that
    Frescati fully complied with the planning requirement of
    18
    “Squat is a hydrodynamic phenomenon, which occurs
    when a ship is moving through the waters. As a ship moves
    forward, it displaces a volume of water. The displaced
    water rushes under the keel of the ship and creates a low
    pressure area causing the ship to sink down toward the
    riverbed. The faster a ship is moving, the more the ship
    will sink down towards the riverbed. This process causes
    a ship to be closer to the riverbed by increasing a vessel’s
    draft.” JA at 70 (citations omitted).
    33
    § 157.455(b)—that is, to use the factors listed in the
    Vessel Operating Procedures Manual when planning the
    passage.
    CARCO’s second argument is that Frescati violated
    § 157.455(b) because Captain Markoutsis failed to
    estimate the Athos I’s underkeel clearance. The District
    Court did not err in finding that Captain Markoutsis had
    estimated underkeel clearance. Captain Markoutsis
    discussed the draft, tidal conditions, and anticipated
    underkeel clearance with Captain Teal. JA at 801–802.
    They estimated that the ship would have at least 1.5
    meters’ clearance—nearly five feet. Id. Captains Bethel
    and Markoutsis also discussed the draft and believed they
    would have sufficient clearance. JA at 833, 837. CARCO
    highlights that there is no evidence of written underkeel
    clearance estimates, but § 157.455 does not require written
    estimates.
    Finally, CARCO argues that the master-pilot
    exchange required by § 157.455 and § 164.11 was
    inadequate. In general, master-pilot exchanges are
    intended to allow the master to share the navigational
    characteristics of his ship with the pilot who will be
    guiding it, and for the pilot to share local conditions such
    as weather, depth, and the tide with the master. Section
    157.455(b) requires that “[t]he tankship master and the
    pilot shall discuss the ship’s planned transit including the
    anticipated under-keel clearance. An entry must be made
    34
    in the tankship’s official log or in other onboard
    documentation reflecting discussion of the ship’s
    anticipated passage.” 
    33 C.F.R. § 157.455
    (b). Section
    164.11 requires that the master ensure that
    [i]f a pilot other than a member of the vessel’s
    crew is employed, the pilot is informed of the
    draft, maneuvering characteristics, and
    peculiarities of the vessel and of any
    abnormal circumstances on the vessel that
    may affect its safe navigation. . . . [and that
    the] [t]idal state for the area to be transited is
    known by the person directing movement of
    the vessel.
    
    33 C.F.R. § 164.11
    (k), (n).
    Captain Markoutsis was responsible for discussing
    the     draft,    underkeel     clearance,   maneuvering
    characteristics, and tidal state with the two pilots who
    guided the Athos I. The testimony shows that Captain
    Markoutsis did so, discussing all the relevant information
    with both pilots, and that he recorded the conversation on
    the signed Pilot Card, which served as sufficient
    documentation of the master-pilot conference. The
    District Court additionally credited Frescati’s expert
    witness, Captain Betz, who observed both Captain Teal
    and Captain Bethel testify. Captain Betz opined that the
    35
    master-pilot exchanges were adequate and customary in
    all respects.
    Frescati operated the Athos I with neither bad
    navigation nor negligent seamanship. Nevertheless, the
    allision occurred. The District Court did not err in
    concluding that the allision resulted from a breach of
    CARCO’s safe berth warranty.
    V.    Wharfinger Negligence
    CARCO wore two hats in its dealings with Frescati,
    as a shipping customer and as a wharfinger. These dual
    roles exposed CARCO to liability under two independent
    legal theories. CARCO’s first role, as a shipping customer
    that contracted with Frescati for delivery of a shipment of
    crude oil, resulted in CARCO’s liability under the
    contractual safe berth warranty, discussed above. The
    second, as the wharfinger for the Paulsboro berth that was
    the Athos I’s intended destination, resulted in the District
    Court’s finding of negligence and CARCO’s
    corresponding liability in tort.
    Both theories of liability independently support the
    District Court’s judgment against CARCO. As a result,
    our decision to affirm the judgment based on CARCO’s
    contractual liability means that we are not required to
    delve into the District Court’s tort analysis. However,
    having reviewed that analysis, we harbor serious doubts
    36
    about the appropriateness of the court’s proposed duty of
    care. For that reason, we are compelled to make clear that
    we will affirm the District Court’s judgment based solely
    on CARCO’s breach of contract.
    A wharfinger’s duty is more limited than that of a
    shipping customer who has provided a safe berth warranty.
    As we previously wrote:
    In the tort context, . . . a wharfinger is not a
    guarantor of a visiting ship’s safety, but is
    bound to use reasonable diligence in
    ascertaining whether the berths themselves
    and the approaches to them are in an ordinary
    condition of safety for vessels coming to and
    lying at the wharf. This is not an
    unconstrained mandate to ensure safe
    surroundings or warn of hazards merely in
    the vicinity. Instead, a visiting ship may only
    expect that the owner of a wharf has afforded
    it a safe approach. In being invited to dock at
    a particular port, a vessel should be able to
    enter, use and exit a wharfinger’s dock
    facilities without being exposed to dangers
    that cannot be avoided by reasonably prudent
    navigation and seamanship.
    In re Frescati, 718 F.3d at 207 (quotations and citations
    omitted). In short, and as a general matter, a wharfinger’s
    37
    duty is to use reasonable diligence to ascertain whether the
    approach to its berth is safe for an invited vessel.19
    We remanded for the District Court to determine in
    the first instance what reasonable diligence required of
    CARCO under the circumstances of this case, and whether
    CARCO breached that standard. Id. On remand, the
    District Court concluded that
    a reasonably prudent terminal operator
    should periodically scan the approach to its
    dock for hazards to navigation as long as
    ships are being invited there. In this case, the
    standard would require that side-scan sonar
    be used to search the approach for
    obstructions that are potential hazards to
    navigation. If an obstruction is located, a
    terminal operator is then required to remove
    it, and if the terminal operator cannot remove
    it, notice of the hazard must be given to
    19
    We previously determined that the allision occurred in
    the approach to CARCO’s berth—the geographic area
    within which a wharfinger’s duty exists—and as a result,
    CARCO had a duty to use reasonable diligence to provide
    the Athos I with a safe approach. In re Frescati, 718 F.3d
    at 211.
    38
    incoming ships by marking it as a hazard
    and/or warning ships of its presence.
    JA at 132. Because CARCO did nothing to look for
    obstructions, the District Court held that it had breached
    its duty.
    The District Court chose its standard by
    determining what the “demands of reasonableness and
    prudence” required. JA at 129. Citing Judge Learned
    Hand’s famous formula from United States v. Carroll
    Towing, 
    159 F.2d 169
     (2d Cir. 1947), the court concluded
    that the precaution of a preemptive side-scan sonar search
    would be less burdensome than the probability of an
    allision multiplied by the serious harm caused by a spill of
    toxic substances like crude oil.
    We have doubts about the District Court’s
    balancing of the cost of preventative measures on one hand
    and the cost of potential accidents on the other. The court
    found that a general scan of the approach to CARCO’s
    berth and the berth itself would have cost between $7,500
    and $11,000, and would have prevented the allision. Yet
    in this very case, the targeted scan of the area where the
    allision occurred, conducted only eight days after the
    allision, did not identify the anchor. The first set of 93
    side-scan sonar passes conducted by Frescati’s expert,
    John Fish—at a cost of $38,577—identified a pump casing
    on the river bottom. The anchor, however, went
    39
    unrecognized.20 We do not share the District Court’s
    confidence that a general $11,000 scan of the approach
    and berth would have “recognized” the anchor with
    sufficient clarity to prevent the allision, given that a
    targeted $38,000 scan for obstructions failed to do so.
    Beyond the questionable utility of side-scan sonar
    as applied to this case, we doubt whether imposing a
    specific duty to require side-scan sonar would be useful
    for wharfingers in the ordinary course of their business.
    Single-hulled vessels like the Athos I present unique risks,
    and have been treated with special care by regulators. See,
    e.g., 
    33 C.F.R. § 157.455
    . Today, as a result of those
    unique risks, such vessels are no longer permitted to
    operate in the waters of the United States. See 46 U.S.C.
    § 3703a (banning single-hulled oil tankers in the waters of
    the United States after January 1, 2015). Furthermore,
    side-scan sonar is not the only method available to detect
    and recognize obstructions, as the District Court pointed
    out.21 Even if we were to accept the court’s balancing of
    20
    Fish testified that the side-scan sonar equipment
    “detected” the anchor, but neither he nor anyone else
    “recognized” it until after the second set of scans were
    taken. JA at 927.
    21
    The court determined that CARCO should have used
    side-scan sonar to search for obstructions, but seemed
    willing to accept that other methods of searching for
    40
    cost, risk, and the magnitude of the potential harm, the
    high standard set forth in this case—involving a risky
    single-hulled vessel—would not necessarily apply to
    future cases, which will necessarily involve only double-
    hulled vessels.22
    We are not unsympathetic to the position in which
    we placed the District Court by asking it to specify the
    duty of care at play in this case. The District Court has
    conscientiously complied. And we stand by our previous
    holding that CARCO had some duty to use reasonable
    diligence to provide the Athos I with a safe approach to its
    obstructions might accomplish the same purpose. It noted
    that “side-scan sonar . . . is not the only method available
    in the industry to search for hazardous debris. . . . Since
    the standard of care involves factual issues, the methods
    may vary when the conditions in the approach to each
    terminal are examined.” JA at 132 n.109.
    22
    Indeed, five years after the Athos I allision, the
    Norwegian tanker SKS Satilla, carrying nearly 42 million
    gallons of crude oil, allided with a sunken oil rig in the
    Gulf of Mexico, sustaining “substantial damage to the port
    side of her hull.” Findings of Fact and Conclusions of
    Law, In re Ensco Offshore Co., No. 4:09-CV-2838, ECF
    No. 185 at 3, ¶¶ 6–7 (S.D. Tex. Sept. 30, 2014). But
    “[b]ecause the SATILLA [was] a double hulled vessel[,]
    . . . there was no discharge of crude oil.” Id. at 3, ¶ 9.
    41
    berth—a duty it may or may not have breached. In re
    Frescati, 718 F.3d at 211. Nevertheless, given CARCO’s
    independent liability in contract and our decision to affirm
    on that basis, we will once again decline to outline
    precisely what CARCO’s duty of reasonable diligence
    entailed.
    VI.   Subrogation and Equitable Recoupment
    This litigation does not implicate the interests of
    only Frescati and CARCO. The United States reimbursed
    Frescati for $88 million in cleanup expenses above the
    liability limit established by the OPA. Consequently, the
    United States became subrogated to Frescati’s claims, and
    joined the fray by filing suit against CARCO in 2008.23
    23
    The United States and CARCO reached a partial
    settlement agreement before the first trial. Both the United
    States and CARCO agreed to forgo any negligence claims
    they might have had against one another. The parties
    agreed that the United States would pursue only its
    contract claim against CARCO. As a result, the United
    States’ judgment against CARCO was based solely on
    CARCO’s contractual liability under the safe berth
    warranty. CARCO, for its part, reserved in the settlement
    agreement
    each and every substantive and procedural
    right available to a defendant . . . including
    42
    Frescati initially paid for the oil spill cleanup costs
    as a “responsible party” under the OPA. See 
    33 U.S.C. § 2702
    (a). The OPA allows a responsible party like
    Frescati to limit its liability to a specified sum; any cleanup
    costs above that amount are reimbursed out of the Oil Spill
    Liability Trust Fund.24 See 
    33 U.S.C. § 2704
    . Under this
    but not limited to the right to raise affirmative
    defenses under any theory or doctrine of law
    or equity, the right to assert setoff or
    recoupment and the right to assert
    compulsory           or         non-compulsory
    counterclaims other than a Claim for
    Contribution or Indemnity . . . .
    JA at 391.
    24
    The Oil Spill Liability Trust Fund, administered by the
    Coast Guard, serves much like insurance for the oil
    transportation industry. Companies that import oil into the
    United States pay a per-barrel fee into the Trust Fund.
    When a tanker vessel spills oil, the OPA assigns liability
    for the cleanup to a “responsible party”—typically the
    owner of the vessel from which the oil spilled. The
    responsible party is liable for all cleanup costs associated
    with the spill. If the costs exceed a liability cap established
    by the OPA, the Trust Fund reimburses the responsible
    party for all expenses above the statutory cap. Liability
    under the OPA does not preclude a responsible party from
    43
    scheme, Frescati’s liability for the cost of the oil spill
    cleanup was limited to approximately $45 million. The
    Trust Fund reimbursed Frescati for its remaining cleanup
    costs, which totaled approximately $88 million. The
    United States then became statutorily “subrogated to all
    rights, claims, and causes of action that the claimant
    [Frescati] has under any other law.” 
    33 U.S.C. § 2715
    (a).
    The United States pursued these claims against CARCO
    as a “person who is liable, pursuant to any law, to the
    compensated claimant [Frescati] or to the Fund, for the
    cost or damages for which the compensation was paid.” 
    33 U.S.C. § 2715
    (c).
    Pursuant to the partial settlement agreement, the
    United States limited itself to the same contractual claims
    Frescati asserted. Because CARCO was liable to Frescati
    in contract, it was also liable to the United States for the
    amount the Trust Fund had reimbursed Frescati: nearly
    $88 million. But CARCO asserted a defense against the
    United States it did not assert against Frescati—equitable
    bringing any claims it has against a third party under any
    other law. The United States, to the extent the Trust Fund
    has reimbursed the responsible party’s costs, steps into the
    shoes of the responsible party as subrogee and may pursue
    claims against a third party as if it were the responsible
    party. Any recovery won by the United States is returned
    to the Trust Fund to cover future oil spill reimbursements.
    44
    recoupment—and in response, the District Court reduced
    the United States’ judgment by 50%. Both CARCO and
    the United States appealed. CARCO argues that the
    District Court erred by not eliminating the United States’
    recovery, while the United States argues that the District
    Court should have left the contract judgment untouched
    and denied CARCO any equitable remedy. We conclude
    that the District Court erred by reducing the United States’
    judgment by 50%. The United States is entitled to a full
    recovery.
    a. Subrogation and Subrogee-Specific
    Defenses
    As an initial matter, we note that the dispute
    between CARCO and the United States presents an
    unusual question about the nature of subrogation.
    Subrogation itself is not unusual; in general terms, it
    “simply means substitution of one person for another; that
    is, one person is allowed to stand in the shoes of another
    and assert that person’s rights against a third party.” US
    Airways v. McCutchen, 
    569 U.S. 88
    , 97 n.5 (2013). Most
    often, it arises in the insurance context as a procedural
    mechanism to allow an insurer (the subrogee) to step into
    the shoes of its insured (the subrogor) after it has
    compensated the insured for harm caused by a third party.
    The subrogee, having stepped into the shoes of the
    subrogor, is entitled to assert all of the subrogor’s rights
    and claims against the responsible third party. Likewise,
    45
    the third party—now defending an action brought by the
    subrogee—is entitled to assert every defense it otherwise
    could have raised against the subrogor. In that vein, the
    third party’s liability to a subrogee cannot be greater than
    it would have been to the subrogor. Restatement (Third)
    of Restitution & Unjust Enrichment § 24.
    All that is unexceptional. The unusual question
    presented here is whether a third party may assert a
    defense against a subrogee that it could not assert against
    the subrogor. As we discussed above, CARCO is liable to
    Frescati, the subrogor, in contract. Consequently, CARCO
    is liable to the United States, the subrogee, under that very
    same contract. But CARCO wishes to assert a defense
    against the United States—namely, that equitable
    recoupment requires the United States to bear the loss
    rather than CARCO because of the allegedly misleading
    conduct of three federal agencies—that it could not assert
    against Frescati.
    The United States makes a related argument. Its
    position is that the equitable recoupment defense,
    predicated as it is on the conduct of federal agencies rather
    than the contractual relationship between Frescati and the
    United States, violates the statutory subrogation provision
    of the OPA. Specifically, the United States argues that it
    is entitled to “all [of Frescati’s] rights, claims, and causes
    of action” under the OPA. 
    33 U.S.C. § 2715
    (a). Frescati’s
    contractual right is not limited by CARCO’s claims
    46
    against the Coast Guard, NOAA, and the Army Corps of
    Engineers; the United States asserting Frescati’s
    contractual right should also not be so limited, and to do
    otherwise would infringe on the United States’ statutory
    entitlement. When Frescati has the right to a full recovery
    under its contract, the argument goes, so does the United
    States.
    We agree. CARCO may only assert defenses
    against the United States’ subrogated claims which it
    could have asserted against Frescati—including any
    equitable recoupment defense it could have asserted
    against Frescati. In its capacity as a subrogee, the United
    States should be subject to the same treatment as Frescati.
    Just as the United States, as subrogee, may only assert
    Frescati’s claims, CARCO, as defendant, is not entitled to
    extra defenses because the United States asserts Frescati’s
    claims rather than Frescati itself. Of course, no party is
    exempt from the Federal Rules of Civil Procedure. The
    United States is subject to the ordinary procedural rules
    governing counterclaims and third-party complaints, and
    the OPA does not bar CARCO from asserting whatever
    claims it has against the United States using those
    recognized procedural mechanisms where appropriate.25
    25
    This issue is complicated by the fact that the specific
    defense asserted by CARCO, equitable recoupment, is
    sometimes pleaded as a defense, and sometimes as a
    47
    In this case, the only claim asserted by the United
    States is Frescati’s contract claim. In re Frescati, 718 F.3d
    at 189; JA at 390. It follows that CARCO’s equitable
    recoupment defense must be directed toward the United
    States’ contract claim. See 718 F.3d at 214 (declining to
    preclude CARCO from raising “equitable defense[s] to the
    Government’s subrogation claims”). If CARCO had other
    cognizable claims against the three federal agencies
    involved in regulating the Delaware River and the
    anchorage, sounding in tort or otherwise, it was free to
    assert them in a third-party complaint or counterclaim, just
    as the United States was free to pursue other claims against
    CARCO.26 In that light, we proceed to analyze CARCO’s
    counterclaim. We do not mean to imply that CARCO
    should have pleaded equitable recoupment as a
    counterclaim rather than a defense. However it is pleaded,
    “recoupment is in the nature of a defense arising out of
    some feature of the transaction upon which the plaintiff’s
    action is grounded,” and here, the plaintiff’s action is
    grounded in Frescati’s contractual right. Bull v. United
    States, 
    295 U.S. 247
    , 262 (1935). To the extent CARCO
    had cognizable claims against the Coast Guard, NOAA,
    and the Army Corps of Engineers, it should have asserted
    those claims directly, rather than as a defense to Frescati’s
    now-subrogated contract claim.
    26
    CARCO was also free to waive its claims against the
    United States, and vice versa. Indeed, both CARCO and
    48
    equitable recoupment defense as it applies to the United
    States’ contractual rights.
    b. Equitable Recoupment
    Equitable recoupment is a “principle that
    diminishes a party’s right to recover a debt to the extent
    that the party holds money or property of the debtor to
    which the party has no right.”27 In re Frescati, 718 F.3d at
    the United States waived certain rights in the 2009 partial
    settlement agreement, including CARCO’s waivers of the
    rights to bring a “Claim for Contribution or Indemnity . . .
    whether based on principles of common law, contract,
    quasi-contract or tort,” and “demand that the court reduce
    or offset the damages awarded to the United States . . .
    based on evidence that the negligence or fault of the
    United States in failing to detect, mark and/or remove
    underwater obstructions to navigation . . . caused or
    contributed to the ATHOS I Incident.” JA at 389. At an
    earlier stage in the litigation, the United States argued that
    CARCO’s equitable recoupment defense amounted to a
    violation of the settlement agreement. The United States
    eventually waived that argument by failing to raise it at the
    first trial, and so we need not consider it today. In re
    Frescati, 718 F.3d at 214.
    27
    A classic example of recoupment is a situation in which
    the statute of limitations is different for two related claims
    49
    214 n.35. For an equitable recoupment defense to succeed,
    the defendant must possess a claim against the plaintiff
    arising from the same transaction or occurrence as the
    plaintiff’s suit, seeking relief of the same kind as that
    sought by the plaintiff, in an amount no greater than that
    arising out of the same transaction—when, for example,
    the statute of limitations period during which the United
    States may file a claim against a taxpayer for
    underpayment of the income tax is longer than the period
    during which a taxpayer may file a claim for a refund of
    overpayment of the estate tax. The taxpayer (in this case,
    the estate of a decedent) pays the estate tax and final year’s
    income tax. Sometime later, after the statute of limitations
    has run on the estate tax overpayment but not the income
    tax underpayment, the government claims the taxpayer
    owes additional income tax for the taxpayer’s final year.
    Due to the increased income tax liability for the year, the
    taxpayer now owes less in estate tax—but the statute of
    limitations has already run, and the taxpayer cannot amend
    the estate tax return. In an action brought by the
    government to recover the extra income tax owed, the
    taxpayer may assert an equitable recoupment defense for
    the amount of the overpayment of the estate tax, even
    though the statute of limitations has run and the taxpayer
    would not otherwise have been able to recover the
    overpayment. See generally Bull v. United States, 
    295 U.S. 247
     (1935).
    50
    sought by the plaintiff. See Livera v. First Nat’l State Bank
    of New Jersey, 
    879 F.2d 1186
    , 1195 (3d Cir. 1989).
    CARCO’s equitable recoupment defense faces at
    least two serious obstacles. As an initial matter, the United
    States questions whether CARCO possesses a “claim”
    against it, rather than a generalized request for the court to
    balance the equities. Second, the United States questions
    whether CARCO seeks relief of the same kind as the
    United States. On both points, CARCO fails to meet its
    burden.
    CARCO’s claim, such as it is, appears to be that the
    equities favor CARCO, and require the United States to
    bear the cost of the spill. CARCO argues that the United
    States, through the Coast Guard, NOAA, and the Army
    Corps of Engineers, had responsibility for maintaining the
    anchorage where the allision occurred free of obstructions.
    In the alternative, if the agencies were not responsible to
    preemptively search for obstructions, CARCO argues they
    should have more explicitly made clear that they were not
    conducting such searches. CARCO asserts that it
    reasonably believed, based on the agencies’ conduct, that
    the agencies were maintaining the anchorage free of
    obstructions. Additionally, CARCO argues that equity
    51
    requires the Oil Spill Liability Trust Fund to bear the cost
    of the cleanup rather than CARCO.28
    28
    Though it is not necessary to our holding, we note that
    these equities do not appear to favor CARCO. As to
    agency regulation and maintenance of the anchorage
    where the allision occurred, the District Court held that the
    agencies did not have a duty to maintain the anchorage
    free of obstructions. The United States does not
    preemptively search for obstructions in the anchorage, it is
    not responsible for doing so, and it did not tell CARCO
    that it would do so. To the extent CARCO believed
    otherwise, CARCO simply misunderstood the regulatory
    structure and the responsibilities (and indeed, the
    capabilities) of the agencies.
    Additionally, to the extent—if at all—that the Coast
    Guard, NOAA, and the Army Corps of Engineers were
    responsible for the Athos I oil spill, reducing the recovery
    of the United States in this case would not be equitable.
    Beyond our concerns relating to subrogation (equity
    would certainly not favor reducing Frescati’s recovery
    under these circumstances), such a decision would impose
    liability on the Oil Spill Liability Trust Fund, not the
    responsible agencies. Any recovery based on the United
    States’ subrogated claim flows back to the Trust Fund, out
    of which the United States originally reimbursed Frescati.
    
    26 U.S.C. § 9509
    (b)(3). The Trust Fund is not intended (or
    52
    Equitable recoupment requires more than just a
    request to balance the equities. CARCO points out that
    although equitable recoupment most often arises in the
    context of offsetting monetary claims, as in tax or
    bankruptcy cases, it is not necessarily limited to those
    situations. See, e.g., Oneida Indian Nation of New York v.
    allowed by statute) to be used as a slush fund to cover the
    liabilities of federal agencies. See 
    33 U.S.C. § 2712
     (“Uses
    of the Fund”).
    As a final point, the purpose of the Trust Fund is not to
    absorb the cost of cleaning up oil spills; indeed, almost the
    opposite is true. The OPA creates a strict liability regime
    for responsible parties, while capping that liability at a set
    amount. But the Trust Fund was not designed to bear those
    costs indefinitely; the subrogation provision of 
    33 U.S.C. § 2715
     allows the United States, on behalf of the Trust
    Fund, to pursue any claim a responsible party could have
    brought against a third party under any law, in order to
    recover the money paid out by the Trust Fund and preserve
    the Trust Fund’s ability to respond quickly to spills in the
    future. The OPA is intended to quickly compensate
    victims of spills, minimize environmental damage, and
    internalize the costs of oil spills within the oil industry.
    The subrogation provision serves those purposes by letting
    cleanup costs fall upon the liable party, rather than with
    the Trust Fund.
    53
    New York, 
    194 F. Supp. 2d 104
    , 136–37 (N.D.N.Y. 2002)
    (allowing an equitable recoupment defense in the context
    of offsetting requests for declaratory judgments in a land
    rights case). But CARCO still must assert some cognizable
    claim, rather than simply a request for the Court to reduce
    the United States’ damages in the interest of equity. Here,
    CARCO has failed to do so.
    Neither does CARCO seek the same kind of relief
    as the United States. The United States seeks contractual
    relief, to which it is entitled by operation of statute. See 
    33 U.S.C. § 2715
    . CARCO, by contrast, seeks equitable
    relief, or (on another reading) essentially tort-based relief
    grounded in misrepresentation by the agencies. The
    mismatched relief sought by CARCO and the United
    States does not support CARCO’s equitable recoupment
    defense.
    The requirement that a defendant seek the same
    kind of relief as has been sought in the plaintiff’s claim is
    a fundamental requisite for recoupment. The defense is not
    intended to be a catch-all to allow any claims otherwise
    barred by time, settlement, or statute to be heard as equity
    seems to require. Equitable recoupment is intended to
    allow only truly similar claims arising from the same
    transaction to offset one another in the interest of equity
    between the parties. As noted, equitable recoupment is
    well-suited for disputes in which two claims arise out of
    the same taxable event or the same contractual obligation,
    54
    as often seen in tax or bankruptcy cases. When, as here,
    the plaintiff seeks relief on a contract, the defendant may
    not resort to equitable recoupment as a means to assert a
    non-contractual claim, whether sounding in an equitable-
    balancing analysis, in tort, or otherwise.
    CARCO has failed to meet its burden of
    establishing an equitable recoupment defense. It is liable
    to the United States in full.
    VII.   Limitation of Liability under the Oil Pollution
    Act
    CARCO argues that a provision of the OPA, 
    33 U.S.C. § 2702
    (d)(2)(B), limits its liability in this case to
    the same extent to which Frescati’s liability was limited—
    approximately $45 million. Because CARCO did not raise
    this defense with the requisite clarity until nearly ten years
    after this litigation began, the District Court concluded that
    CARCO waived it. We agree that the defense was waived.
    A District Court’s holding that an affirmative
    defense has been waived is reviewed for abuse of
    discretion. Cetel v. Kirwan Financial Group, Inc., 
    460 F.3d 494
    , 506 (3d Cir. 2006). Waiver is appropriate if the
    party raising the defense did not do so at a “pragmatically
    sufficient time” and if the opposing party would be
    prejudiced if the defense were allowed. Charpentier v.
    Godsil, 
    937 F.2d 859
    , 864 (3d Cir. 1991).
    55
    Whether CARCO raised its defense at a
    pragmatically sufficient time requires us to determine
    when CARCO first raised the § 2702(d)(2)(B) defense.
    CARCO argues that it first raised the limitation defense in
    its 2005 answer to Frescati’s Amended Counterclaim by
    referring to the OPA. The District Court concluded that
    CARCO’s answer contained nothing that would have put
    Frescati or the United States on notice that CARCO
    planned to rely on a limitation of liability defense. In
    general, “[a]n affirmative defense . . . ‘need not be
    articulated with any rigorous degree of specificity, and is
    sufficiently raised for purposes of [Fed. R. Civ. P. 8] by its
    bare assertion.’ ” Moody v. Atl. City Bd. of Educ., 
    870 F.3d 206
    , 218 (3d Cir. 2017) (quoting Zotos v. Lindbergh Sch.
    Dist., 
    121 F.3d 356
    , 361 (8th Cir. 1997)). Nevertheless, the
    party asserting the defense must actually do so, and in a
    way that gives fair notice of that defense.
    CARCO relies on the averment listed as its
    “Seventh Separate Defense,” which reads simply: “The
    claims and causes of action set forth in the plaintiffs’
    Amended Counterclaim are barred in whole or in part by
    the provisions of the Oil Pollution Act of 1990, 
    33 U.S.C. § 2701
    , et seq.” JA at 355. Noticeably absent from this
    general averment is any specific citation to the limitation
    of liability defense or even a description of the nature of
    the defense. This is significant, because the OPA includes
    a number of potential affirmative defenses. See, e.g., 33
    
    56 U.S.C. § 2702
    (b) (limiting scope of damages for which the
    OPA imposes liability); § 2702(c) (excluding certain oil
    spills from OPA liability); § 2702(d)(1)(A) (shifting
    liability under the OPA to a solely responsible third party);
    § 2702(d)(2) (limiting the liability of certain parties under
    the OPA); § 2703 (“Defenses to liability”). CARCO’s
    general reference to the entirety of the OPA did not
    provide adequate information from which Frescati could
    determine that CARCO was seeking to limit its liability
    under § 2702(d)(2)(B). Nor did CARCO develop this
    defense at any point before the first trial. For that reason,
    CARCO’s unspecified reference to the OPA did not
    provide the requisite fair notice to Frescati.
    Furthermore, Frescati would be prejudiced if the
    defense were allowed. As the District Court found, if
    CARCO had asserted its defense in a timely fashion,
    fifteen days of depositions and trial testimony from seven
    witnesses could have been avoided, along with the OPA
    damages phase of the first trial.29
    29
    Allowing CARCO to assert the defense after failing to
    raise it at a practicable time wastes the District Court’s
    resources as well.
    Affirmative defenses must be raised as early
    as practicable, not only to avoid prejudice,
    but also to promote judicial economy. If a
    57
    CARCO did not clearly assert the limitation defense
    until nearly a decade after this action commenced, and
    over a year after the first trial and appeal had concluded.
    The District Court appropriately concluded that CARCO
    had not raised the defense at a pragmatically sufficient
    time, and that Frescati would be prejudiced if the defense
    were allowed. The District Court did not abuse its
    discretion in finding the defense waived.30
    VIII.   Prejudgment Interest Rate
    The District Court awarded Frescati prejudgment
    interest of just over $16 million. Frescati, in its cross-
    appeal from the District Court’s judgment, argues that the
    District Court erred by using the federal postjudgment
    party has a successful affirmative defense,
    raising that defense as early as possible, and
    permitting a court to rule on it, may terminate
    the proceedings at that point without wasting
    precious legal and judicial resources.
    Robinson v. Johnson, 
    313 F.3d 128
    , 137 (3d Cir. 2002).
    30
    It is worth noting that the United States similarly waived
    a defense by its failure to raise an argument in the first
    trial. We previously held that the United States waived its
    right to object to CARCO’s equitable recoupment defense
    on the basis that it violated the terms of the partial
    settlement agreement. In re Frescati, 718 F.3d at 214.
    58
    interest rate set by 
    28 U.S.C. § 1961
    (a) to determine the
    amount of the prejudgment interest award. Specifically,
    Frescati argues that the District Court improperly believed
    itself bound to use the federal postjudgment rate rather
    than the higher U.S. prime rate because Frescati did not
    present evidence of its borrowing costs.
    An award of prejudgment interest is reviewed for
    abuse of discretion. Ambromovage v. United Mine
    Workers of Am., 
    726 F.2d 972
    , 981–82 (3d Cir. 1984); see
    also Sun Ship, Inc. v. Matson Nav. Co., 
    785 F.2d 59
    , 63
    (3d Cir. 1986). When selecting an interest rate, the District
    Court must keep in mind that the rate and corresponding
    award “must be compensatory rather than punitive.” Del.
    River & Bay Auth. v. Kopacz, 
    584 F.3d 622
    , 634 (3d Cir.
    2009).
    Here, the District Court awarded Frescati
    prejudgment interest at the one-year Treasury rate—the
    same rate used as the federal postjudgment interest rate.
    See 
    28 U.S.C. § 1961
    (a). Importantly, the District Court
    found that the postjudgment rate would “fairly and
    adequately compensate Frescati for its losses.” JA at 183.
    Frescati argues that, in the absence of evidence of
    borrowing costs, we should require the use of the U.S.
    prime rate. We grant that, had the District Court chosen to
    use the prime rate, it would not have abused its discretion
    even without extensive proof of borrowing costs. Taxman
    59
    v. Bd. of Educ., 
    91 F.3d 1547
    , 1566 (3d Cir. 1996) (en
    banc). Indeed, the prime rate is commonly used to
    approximate the cost the defendant would have paid to
    borrow in the market, and at least one court appears to
    require it. See, e.g., Gorenstein Enters., Inc. v. Quality
    Care-USA, Inc., 
    874 F.2d 431
     (7th Cir. 1989) (requiring
    use of the prime rate in certain circumstances); see also
    Forman v. Korean Air Lines Co., 
    84 F.3d 446
    , 450–51
    (D.C. Cir. 1996) (“[T]he prime rate is not merely as
    appropriate as the Treasury Bill rate, but more appropriate
    . . . .”). In this Circuit, however, a district court is not
    constrained to the use of only the prime rate: “[i]n
    exercising [its] discretion, . . . the court may be guided by
    the rate set out in 
    28 U.S.C. § 1961
    .” Sun Ship, 
    785 F.2d at 63
    ; Taxman, 
    91 F.3d at 1566
     (“[A] court ‘may’ use the
    post-judgment standards of 
    28 U.S.C. § 1961
    (a) [to
    calculate prejudgment interest, though] it is not compelled
    to do so.”).31
    The District Court determined that the federal
    postjudgment rate “fairly and adequately compensate[s]
    31
    Nor was it an abuse of discretion for the District Court
    to adopt a variable interest rate. Interest accumulated for
    more than a decade, and during that time prevailing
    interest rates changed substantially.
    60
    Frescati for its losses.” JA at 183. Under our Court’s
    precedent, the District Court acted within its discretion.
    IX.   Conclusion
    The District Court’s order dated August 17, 2016
    will be affirmed in part, vacated in part, and reversed in
    part. The District Court’s judgment in favor of Frescati on
    the breach of contract claim and the prejudgment interest
    award will be affirmed. The District Court’s judgment in
    favor of Frescati on the negligence claim will be vacated.
    The District Court’s judgment in favor of the United States
    will be affirmed in part with respect to CARCO’s liability
    on the subrogated breach of contract claim, but the
    judgment will be reversed and remanded for further
    proceedings in light of our equitable recoupment ruling for
    the purpose of recalculating damages and prejudgment
    interest. The District Court’s order dated April 9, 2015,
    denying CARCO’s motion for partial summary judgment
    on its limitation of liability defense, will be affirmed.
    61