CPC v. Northbrook ( 1998 )


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  • United States Court of Appeals
    For the First Circuit
    Nos. 97-2073
    97-2074
    CPC INTERNATIONAL, INC.,
    Plaintiff, Appellee,
    v.
    NORTHBROOK EXCESS AND SURPLUS
    INSURANCE COMPANY,
    Defendant, Appellant.
    APPEAL FROM THE UNITED STATES DISTRICT COURT
    FOR THE DISTRICT OF RHODE ISLAND
    [Hon. Francis J. Boyle, Senior U.S. District Judge]
    Before
    Torruella, Chief Judge,
    Lynch, Circuit Judge,
    and Stearns, District Judge.
    Michael Aylward, with whom Alice Olsen Mann, Morrison, Mahoney
    & Miller, Daniel A. Bartoldus, James J. Jennings, Joshua N.
    Krellen, and Rivkin, Radler & Kremer were on brief, for appellant.
    David L. Harris, with whom Geoffrey A. Price, Lowenstein,
    Sandler, Kohl, Fisher & Boylan, P.C., Mark O. Denehy, and Adler,
    Pollock & Sheehan, Inc. were on brief, for appellee.
    Laura A. Foggan, Daniel E. Troy, Andrew D. Tabachnik, andWiley, Rein & Fielding on brief for amicus curiae Insurance
    Environmental Litigation Association.
    June 1, 1998
    LYNCH, Circuit Judge.  An accident in 1974 involving a
    railroad tank car and a chemical storage tank has led to years of
    environmental litigation and, ultimately, to this court's
    consideration of those events almost a quarter century later.  In
    June 1974, an engineer of the Providence and Worcester Railroad
    Company moved a group of railroad tank cars while one car was still
    attached to a chemical storage tank at a manufacturing facility in
    Cumberland, Rhode Island.  The facility is located on the banks of
    the Blackstone River.  A hole was torn in the bottom of the tank
    and the contents, over 6,200 gallons of perchlorethylene ("perc"),
    gushed out, boring a four-foot hole in the ground.  The fire
    department responded to an emergency call and hosed down the area
    of the spill.  No further action was taken, and so matters rested
    until 1979.
    In October 1979, the Rhode Island Department of Public
    Health tested drinking water wells across the Blackstone River, in
    the nearby town of Lincoln, for environmental pollution.  The
    state's decision to test in this manner was an advanced one for the
    times.  Those tests and subsequent tests showed that the wellfields
    and the aquifer from which they drew water were contaminated with
    a variety of volatile organic chemicals ("VOC's"), including  perc,
    1,1-dichlorethane, 1,1-dichloroethylene, 1,2-transdichloroethylene,
    1,1,1-trichloroethane, trichloroethylene, and
    trichlorofluoromethane.  The wells, which supplied water to
    Cumberland and Lincoln, were immediately closed.  Subsequent
    investigation by the United States Environmental Protection Agency
    ("EPA") pointed to an area across the Blackstone River and east of
    the wells as the likely source of the aquifer's contamination.
    That area was occupied by the Peterson/Puritan manufacturing
    facility, which produced and packaged various household and
    personal care products.  Peterson/Puritan is a subsidiary of the
    plaintiff CPC International, Inc., now known as Bestfoods.  This
    facility is where the tank car accident happened in 1974.
    This suit demonstrates the immense cost, complexity and
    duration of environmental insurance litigation.  In 1987, CPC sued
    its excess carrier, Northbrook Excess and Surplus Liability
    Company, for indemnification of costs incurred during the EPA
    ordered clean-up of pollution at Peterson/Puritan.   This is the
    third appeal to this court.  Judgments have twice been vacated,
    this court has certified a question to the Rhode Island Supreme
    Court, the Rhode Island Supreme Court has issued an opinion which
    clarified Rhode Island "trigger of coverage" law, and the case has
    been twice tried to juries.  We discuss that history later.  In
    1997, a jury awarded CPC $12,632,885.94 in damages plus over $5
    million in pre-judgment interest.  That award is the subject of
    this appeal.
    As is common in these cases, the jury had two main issues
    to decide.  The first was whether an "occurrence" causing property
    damage took place between July 1, 1979, and July 1, 1980, which was
    the policy period during which Northbrook provided coverage.  The
    second was to determine whether the property damage resulted from
    company activities that were excluded from coverage by the policy's
    standard "pollution exclusion" provision or whether the relevant
    occurrences fit within the also standard "sudden and accidental"
    exception to that exclusion (and was thus covered).  As evidenced
    by the verdict, the jury decided both issues in favor of CPC.
    Northbrook attacks the verdict on both fronts.  First,
    Northbrook says the evidence compels the conclusion that there was
    no occurrence during the policy period.  Northbrook says that the
    "property damage" at issue in the case is strictly in the area
    immediately surrounding the Peterson/Puritan manufacturing
    facility, and that CPC either knew or should have known of this
    property damage prior to the policy period.  Therefore, there was
    no "occurrence" (as that term is defined in Rhode Island law)
    during the policy period and no coverage is available.
    Northbrook buttresses this challenge by saying it was
    unfairly hampered in its presentation of its case (that CPC knew or
    should have known of the property damage) when the trial court
    excluded evidence about environmental events before 1979 elsewhere
    in the CPC corporate family.  Northbrook says that the proposed
    evidence, two prior judicial decisions in which CPC was a party,
    contained fact-findings relevant to the state of CPC's internal
    knowledge and the state-of-knowledge in the industry about
    groundwater pollution.  Northbrook's says that the evidence
    demonstrates that CPC's regular waste-disposal practices and the
    1974 perc spill should have put CPC on notice of property damage
    long before 1979, and thus there is no coverage during the insuring
    period.
    Second, Northbrook challenges the jury's conclusion that
    the property damage was caused by a "sudden and accidental"
    discharge.  Northbrook concedes the 1974 perc spill was sudden and
    accidental, but argues that the evidence compels a conclusion that
    it was Peterson/Puritan's routine waste-disposal and polluting
    practices, not the 1974 perc spill, which caused the pollution
    around the Peterson/Puritan site.  Northbrook points out that the
    comprehensive general liability policy at issue here contains a
    standard pollution exclusion for the discharge of chemicals, and
    the only exception to that exclusion is for "sudden and accidental"
    events.  Thus, Northbrook says, even if there were an occurrence
    during the policy period, Northbrook is still not liable because
    the clean-up costs were driven by CPC's routine polluting
    activities, not the spill.
    Now, twenty-five years after the tank rupture, almost
    twenty years after the discovery that the wells were contaminated
    and eleven years after the suit was instituted, we affirm the jury
    award.  While the evidence did not necessarily require the jury's
    conclusions, it certainly permitted them.  We do not reach the
    cross-appeal.
    I
    Background Facts
    We set the stage for the parties' arguments with a
    general outline of the actions and findings of the involved
    governmental environmental agencies as to the two wellfields and
    the Peterson/Puritan site.  Much of this is undisputed.  The
    appropriate inferences to be drawn from certain environmental
    findings are, of course, disputed, and were argued to the jury.
    In October 1979, the Rhode Island Department of Health,
    Division of Water Supply, using testing procedures advanced for the
    times, tested the municipal water supplies of the Town of
    Cumberland and the neighboring Town of Lincoln and discovered VOC
    contamination.  The Quinnville Wellfield, supplying Cumberland, is
    located on the west side of the Blackstone River, across the river
    and approximately three fifths of a mile from the Peterson/Puritan
    manufacturing facility.  The Lenox Street Well, supplying Lincoln,
    is located on the same side of the river as Peterson/Puritan, over
    a mile away.  Both wells were closed immediately after the
    contamination was discovered.
    In 1980, the EPA hired environmental engineers Goldberg-
    Zoino and Associates ("GZA") to conduct a hydrogeologic study of
    portions of the aquifer underlying and around the Blackstone River
    in order to establish the source and extent of the groundwater
    pollution contaminating the wells.  In 1982, GZA reported its
    conclusion that the most probable source of the contamination of
    the Quinnville Wellfield was the Peterson/Puritan plant.  GZA
    relied principally on three critical findings:  (1) the highest
    levels of VOC groundwater contamination were observed in the
    industrial area where Peterson/Puritan was located; (2) the VOC's
    found in the Quinnville Wellfield were the same as those found in
    the groundwater in the industrial area; and (3) Peterson/Puritan
    was the only operation in the area known to use and store the VOC's
    found in the water supply.
    According to GZA's report, the Blackstone River typically
    acts as a groundwater flow boundary, meaning that groundwater on
    the east side of the river is generally unable to cross over to the
    west side.  When the wells are pumping, however, the river is not
    an effective barrier and groundwater is drawn into the wellfield.
    During sustained pumping of the Lincoln
    wellfield, . . . a portion of the flow crosses
    the Blackstone from the Cumberland side of the
    river.  Flow enters the wellfield via both
    induced infiltration from the river and direct
    groundwater flow beneath the river from the
    northeast corner of the site.
    In addition, the levels of the contaminant concentration in the
    wellfield are directly related to the intensity of the pumping.
    When the wells are turned off and the flow
    field reverts to its natural state, as
    described above, contaminant levels decrease
    significantly.  When the wells are turned on
    again, contaminant concentrations increase
    with pumping duration to their previous
    levels.  This indicates that contaminant flow
    is being induced via pumping from outside of
    the normal recharge area for the wellfield,
    i.e. the Cumberland side of the Blackstone
    River [where Peterson/Puritan is located].
    GZA concluded that the pumping of the wells drew contaminants
    from the area immediately surrounding the Peterson/Puritan plant
    under and across the river into the wellfield.  Based on this
    analysis, Peterson/Puritan became the EPA's primary focus.
    Following this report, Peterson/Puritan hired Malcolm
    Pirnie, Inc., another environmental engineering firm, to further
    analyze the VOC groundwater contamination of the wellfield.
    Malcolm Pirnie's report, issued in June 1983, supported GZA's
    conclusion.  "Peterson/Puritan is responsible for the release of
    VOC's to the aquifer sufficient to have contributed to the past
    contamination of the Quinnville Wellfield . . . ."  In addition,
    "the sustained pumping from the wellfields could draw contaminated
    groundwater from the east to the west side of the Blackstone River
    where it could be drawn into the wells."  The report stated that
    the wellfield was no longer contaminated, but that contamination
    would be renewed by the recommencement of pumping within the
    wellfield without prior interception of the contaminant plume.
    In 1983, the EPA designated an area including both the
    Peterson/Puritan site and the aquifer east of the Blackstone River
    as "OU-1," and placed the site on its National Priorities List.  In
    1987, following several years of negotiations with
    Peterson/Puritan, the EPA issued an Administrative Order by
    Consent, pursuant to the Comprehensive Environmental Response
    Compensation and Liability Act ("CERCLA"), 42 U.S.C.  9601-9675.
    That Order identified Peterson/Puritan as the party responsible for
    the release of the hazardous substances migrating into the
    groundwater at OU-1.
    As required by the Order, Peterson/Puritan undertook a
    Remedial Investigation/Feasibility Study ("RI/FS") to investigate
    additional responsible parties and further analyze site conditions.
    This report was prepared by ABB Environmental Services and issued
    in 1993.  ABB, like Malcolm Pirnie, largely confirmed GZA's finding
    that Peterson/Puritan was the principal source of VOC contamination
    in the aquifer and the Quinnville Wellfield.
    The EPA issued its Record of Decision ("ROD") for the OU-
    1 site in June 1993.  The ROD stated that the Quinnville Wellfield
    "was a drinking water source in 1979, when it was closed due to OU-
    1 contamination.  Prior to its closure, the wellfield provided
    water that did not pose any health threats."  The ROD further
    stated that the 1974 perc spill, along with historical releases
    into manholes and catch basins, was the primary source of
    contamination of the Quinnville Wellfield.  The ROD concluded that
    the wells could be reopened when the contamination was remediated,
    and ordered CPC to clean up the OU-1 area as a prerequisite for the
    reopening of the wells.  Finally, because the wellfield was "a
    receptor of OU-1 contamination," and "the potential future use of
    the wellfield as a drinking water source is a realistic
    possibility," the December 13, 1995, Consent Order between CPC and
    the EPA extended OU-1 to include the Quinnville Wellfield.
    II
    Insurance Coverage and Terms
    A.  Primary Coverage and Town of Lincoln Suit
    In October 1982, based on GZA's report, the Town of
    Lincoln filed suit against Peterson/Puritan for damages resulting
    from the contamination of its water supply.  In June 1984, the suit
    was settled when Peterson/Puritan agreed to pay the Town of Lincoln
    $780,000 and install and maintain engineering controls in exchange
    for the Town's release of all potential claims.  The settlement was
    paid by Northwestern National Insurance Company, CPC's primary
    insurance carrier, under a policy with a coverage limit of $1
    million.  On April 10, 1987, Northwestern National informed CPC and
    Northbrook that the primary insurance policy was exhausted, thus
    bringing Northbrook into the arena.
    B.  The CPC-Northbrook Insurance Policy
    From July 1, 1979, to July 1, 1980, CPC was insured by
    Northbrook under an umbrella liability policy.  This policy, with
    a limit of $25 million, was CPC's first layer excess policy, hence
    the next coverage in line after Northwestern National's $1 million
    primary policy was exhausted.  The Northbrook policy insured CPC
    worldwide, including CPC's subsidiaries and all other entities
    financially controlled by CPC.
    Under Section 1, "Coverage," the policy stated:
    The Company hereby agrees, subject to the
    limitations, terms and conditions hereinafter
    mentioned, to indemnify the Insured for all
    sums which the Insured shall be obligated to
    pay by reason of the liability
    A.  imposed upon the Insured by law, or
    B.  assumed under contract or agreement
    by the Named Insured,
    for damages on account of
    A.  Personal Injuries
    B.  Property Damage
    C.  Advertising Liability,
    caused by or arising out of each Occurrence
    happening anywhere in the world.
    The Definitions section contained the following definitions:
    "Property Damage" shall mean loss of or
    direct damage to or destruction of tangible
    property (other than property owned by any
    Insured) and which results in an Occurrence
    during the policy period. . . .
    "Occurrence" means an accident, event or
    happening including continuous or repeated
    exposure to conditions which results, during
    the policy period, in Personal Injury,
    Property Damage or Advertising Liability
    neither expected nor intended from the
    standpoint of the Insured. . . .
    The Exclusions section provided:
    This policy shall not apply to Personal Injury
    or Property Damage arising out of the
    discharge, dispersal, release or escape of
    smoke, vapors, soot, fumes, acids, alkalis,
    toxic chemicals, liquids or gases, waste
    materials or other irritants, contaminants or
    pollutants into or upon land, the atmosphere
    or any water course or body of water; but this
    exclusion does not apply if such discharge,
    dispersal, release or escape is sudden and
    accidental.
    In a "reservation-of-rights" letter dated April 27, 1987,
    Northbrook advised CPC that it had no obligation to indemnify CPC
    for claims arising from the Town of Lincoln action or the EPA-
    ordered cleanup.  The letter was based, inter alia, on the
    pollution exclusion and on the date of occurrence.
    III
    This Litigation
    A.  Commencement of Suit and Initial Application of New Jersey Law
    On July 21, 1987, CPC filed suit against Northbrook in
    New Jersey Superior Court.  CPC alleged that all of the conditions
    precedent to insurance coverage had been satisfied or waived, and
    sought a declaration that Northbrook was obligated to indemnify CPC
    for Peterson/Puritan's "entire ultimate net loss" in excess of
    Northwestern National's $1 million coverage limit.  CPC also sought
    a judgment estopping Northbrook from further denying coverage.
    Northbrook removed the action to the U.S. District Court
    for the District of Rhode Island pursuant to 28 U.S.C.  1404(a).
    CPC then filed a motion for a declaration that the substantive
    law of New Jersey still governed the litigation.  The motion
    was allowed on the basis that a New Jersey court would apply
    New Jersey law to the case because New Jersey was the state
    which connected all the parties together and so had the most
    significant interest in the outcome of the case.  See CPC
    Int'l, Inc. v. Northbrook Excess & Surplus Ins. Co., 
    739 F. Supp. 710
    , 715 (D.R.I. 1990).
    Applying New Jersey law, the district court allowed
    Northbrook's motion for summary judgment on the ground that the
    pollution exclusion clause in the policy precluded coverage for
    gradual pollution.  See CPC Int'l, Inc. v. Northbrook Excess
    & Surplus Ins. Co., 
    759 F. Supp. 966
     (D.R.I. 1991).  The
    district court predicted that the New Jersey Supreme Court,
    which had not ruled on the issue, would define the term "sudden
    and accidental" as referring to events which are unexpected and
    unintended and which occur abruptly or over a short period of
    time.  See 
    id. at 973
    .  The court ruled that CPC had not shown
    that the contamination was within this definition.
    On appeal, this court reversed and remanded, saying
    the district court's prediction gave insufficient weight to the
    decisions of the New Jersey Superior Court's Appellate Division
    (New Jersey's intermediate appellate court), which had
    concluded that the term "sudden and accidental" was ambiguous
    and had to be interpreted favorably to insureds as providing
    coverage for gradual pollution.  This court concluded that the
    New Jersey Supreme Court would more likely construe "sudden and
    accidental" to mean only unintended and unexpected, i.e., not
    requiring the event to be abrupt or immediate.  See CPC Int'l,
    Inc. v. Northbrook Excess & Surplus Ins. Co., 
    962 F.2d 77
    , 97
    (1st Cir. 1992).
    B.  Round Two: Application of Rhode Island Law and First Trial
    On remand, Northbrook moved for reconsideration of
    the initial choice-of-law ruling in light of an intervening
    change in New Jersey choice-of-law rules.  That motion was
    granted on the basis that New Jersey law now dictated that the
    substantive law of Rhode Island governed the case.  See CPC
    Int'l, Inc. v. Northbrook, 
    839 F. Supp. 124
     (D.R.I. 1993).
    This court denied CPC's petition for mandamus.
    The case went to a jury trial on January 28, 1994.
    At the close of CPC's evidence, Northbrook moved for judgment
    as a matter of law under Fed. R. Civ. P. 50(a).  On February
    16, 1994, the district court granted Northbrook's motion,
    saying that CPC had failed to present evidence from which a
    reasonable juror could conclude that there had been an
    "occurrence" during the 1979-80 policy period, because the perc
    spill took place in 1974 and there was no evidence that the
    contamination reached the aquifer during the policy period.
    C.  The Second Appeal:  The Trigger of Coverage Question Under
    Rhode Island Law
    On appeal, this court affirmed the application of
    Rhode Island law, but concluded that Rhode Island law was
    unclear on the trigger of coverage and certified this question
    to the Rhode Island Supreme Court:
    What trigger-of-coverage standard would the
    Rhode Island Supreme Court use for
    determining at what point an "occurrence"
    causing "property damage" took place,
    within the meaning of the insurance policy
    provisions provided in the separate opinion
    in this case, where an insured alleges that
    a spill of hazardous contaminants in 1974
    migrated through the groundwater, causing
    immediate injury to the pertinent property,
    which was not, in fact, discovered,
    however, until at least 1979.
    CPC Int'l, Inc. v. Northbrook, 
    46 F.3d 1211
    , 1222 (1st Cir.
    1995).  The Rhode Island Supreme Court answered:
    [A]n "occurrence" under a general liability
    policy takes place when property damage,
    which includes property loss, manifests
    itself or is discovered or in the exercise
    of reasonable diligence, is discoverable.
    CPC Int'l, Inc. v. Northbrook, 
    668 A.2d 647
    , 650 (R.I. 1995).
    In light of that answer, this court vacated the judgment in
    Northbrook's favor and remanded the case for a new trial.  The
    second trial was conducted in June of 1997 and resulted in the
    verdict for CPC.  CPC was awarded $12,632,885.94 in damages
    plus prejudgment interest in the amount of $5,333,283.  In
    addition, Northbrook was obligated to reimburse CPC for all
    costs incurred by CPC in remediating the Peterson/Puritan site
    after February 28, 1997.  After the jury verdict, the court
    denied Northbrook's motions for judgment as a matter of law
    under Fed. R. Civ. P. 50 and for a new trial under Fed. R. Civ.
    P. 59.  It is from this jury verdict that this appeal is taken.
    IV
    Discussion
    We discuss the pertinent evidence in light of the
    particular claims on appeal.  The facts are stated as the jury
    and district court could have found them.  See Cambridge
    Plating Co., Inc. v. Napco, Inc., 
    85 F.3d 752
    , 756 (1st Cir.
    1996).
    A.  The Discoverability of Property Damage
    Northbrook's central argument on appeal is that its
    motion for judgment as a matter of law was improperly denied,
    because the evidence compels the conclusion that CPC knew or
    reasonably should have known of property damage before July 1979.
    Appellate review of the grant or denial of a motion
    for judgment under Fed. R. Civ. P. 50 is de novo, applying the
    same standard that governed the adjudication of the motion in
    the district court.  See Costos v. Coconut Island Corp., 
    137 F.3d 46
    , 48 (1st Cir. 1998).  All of the evidence is examined
    in the light most favorable to the nonmoving party, drawing all
    possible inferences in its favor.  See Cambridge Plating Co.,
    
    85 F.3d at 764
    .  We do not consider the credibility of
    witnesses, resolve conflicts in testimony, or evaluate the
    weight of the evidence.  See Wagenmann v. Adams, 
    829 F.2d 196
    ,
    200 (1st Cir. 1987).  We will reverse the denial of a Rule 50
    motion "only if reasonable persons could not have reached the
    conclusion that the jury embraced."  Coconut Island Corp., 
    137 F.3d at 48
     (citation and internal quotation marks omitted).
    Here, the initial issue is whether there is
    sufficient evidentiary support for the jury's conclusion that
    there was an "occurrence" between July 1, 1979, and July 1,
    1980.  The terms of the policy are set forth earlier.  The
    definition of "occurrence" is given content by Rhode Island
    law:
    [A]n "occurrence" under a general liability
    policy takes place when property damage,
    which includes property loss, manifests
    itself or is discovered or in the exercise
    of reasonable diligence, is discoverable.
    CPC Int'l, Inc., 
    668 A.2d at 650
    .  Under this formulation, the
    term "occurrence" and "property damage" are closely connected:
    Read together, the provisions of the
    Northbrook policy provide coverage to an
    insured that sustains an occurrence -- that
    is, an event that results in compensable
    property damage during the policy period.
    In other words, there can be no occurrence
    under the policy without property damage
    that becomes apparent during the policy
    period, and property loss and compensable
    damages cannot be assessed unless the
    property damage is discovered or manifests
    itself.  "Property damage" and "occurrence"
    are thus inextricably intertwined.
    
    Id. at 649
    .
    Northbrook focuses its attack on the
    "discoverability" prong of the Rhode Island definition of
    "occurrence", saying that CPC should have known that its
    routine waste-disposal and polluting activities and the 1974
    perc spill would cause property damage long before 1979.
    Northbrook argues that the jury, while properly instructed on
    Rhode Island law, misapplied that instruction.  As to how the
    jury applied the instruction, our knowledge is only that the
    jury returned a general verdict in favor of CPC in the amount
    of $12,632,885.94, and thus necessarily found that the property
    damage did not manifest itself, and could not have reasonably
    been discovered, before July 1979.  Northbrook did not request
    special verdicts.
    B.  Exclusion of Evidence
    Before addressing the merits of the insurer's
    argument on this sufficiency issue, we stop to consider
    Northbrook's argument that it was erroneously prevented from
    painting a fair and complete picture for the jury by the
    exclusion of evidence.  As with any argument addressed to the
    exclusion of evidence, Northbrook faces the challenge of
    meeting the abuse of discretion standard.  See Rodriguez-
    Hernandez v. Miranda-Velez, 
    132 F.3d 848
    , 855 (1st Cir. 1998)
    (citation omitted).  If Northbrook were correct that the
    exclusion of evidence was an abuse of discretion and
    prejudicial, we would not reach the issue of whether there was
    adequate evidence to support the jury verdict.  But while
    Northbrook's argument is far from frivolous, our conclusion is
    that the ruling was well within the court's discretion.
    The major component of Northbrook's defense was that CPC
    should have known about the property damage resulting from the perc
    spill and other polluting activities well before 1979.  Towards
    that end, Northbrook put on state-of-the-art and state-of-knowledge
    evidence as to CPC's knowledge before 1979 of the dangers of
    release of VOC's and perc in an effort to show that CPC knew or
    should have known that the chemicals would contaminate the ground
    and groundwater.
    We take it as given that such evidence may generally be
    helpful to the jury in determining what a party should have known
    at some time in the past.  Findings about what another operation of
    the company knew and had been told about the danger of groundwater
    contamination of a similar type can help the jury in determining
    whether CPC exercised reasonable diligence with regard to this
    particular spill.  See Chemical Leaman Tank Lines, Inc. v. Aetna
    Cas. and Sur. Co., 
    817 F. Supp. 1136
    , 1150 (D.N.J. 1993) (admitting
    evidence of plaintiff insured's problems at other tank cleaning
    sites on issue of company's knowledge).
    Such state-of-the-art and state-of-knowledge evidence is
    used by both sides in many contexts in civil and criminal
    environmental and toxic tort litigation.  For example, it is used
    by insurers and insureds in insurance coverage cases.  See Mottolov. Fireman's Ins. Co., 
    43 F.3d 723
    , 730 (1st Cir. 1995) (discussing
    the usual summary judgment burden shifting rules applied to this
    area of law); Chemical Leaman Tank Lines. Inc., 
    817 F. Supp. at 1149-50
     (use by insurer against insured); Hatco Corp. v. W.R. Grace
    & Co., 
    801 F. Supp. 1334
    , 1376 (D.N.J. 1992)(insured submits state-
    of-knowledge evidence to oppose insurer's contention that insured
    intended and expected to cause contamination at site); New Castle
    County v. Continental Cas. Co., 
    725 F. Supp. 800
    , 803-04 (D. Del.
    1989) (state-of-the-art knowledge about leachate from landfills
    apparently introduced by insured on issue of whether the pollution
    was expected).  It is also used in the allocation of responsibility
    under the "Gore" factors in private party CERCLA contribution
    actions.  See Gould v. A&M Battery Tire Serv., 
    987 F. Supp. 353
    ,
    363-64 (M.D. Pa. 1997) (successor operator presents state-of-the-
    art defense).  Some state-of-the-art evidence was introduced here,
    but specific evidence was excluded.
    Here, Northbrook sought to introduce (1) judicial
    decisions in two previous CPC coverage suits involving groundwater
    contamination at CPC facilities in New Jersey and Michigan, see CPC
    Int'l, Inc. v. Hartford Accident & Indemnity Co., Bergen No. L-
    37236-89 (N.J. Super. April 15, 1996); CPC Int'l, Inc. v. Aerojet
    Corp., 
    825 F. Supp. 795
     (W.D. Mich. 1993); (2) trial testimony of
    CPC's Senior Corporate Counsel and others as to whether certain
    facts found in those opinions were correct; and (3) certain related
    documents.  There was no specific offer of proof as to what any of
    the proposed witnesses would say; their depositions had not been
    taken.  Nor was this broad band of evidence narrowly tailored to
    the precise issues involved at trial.
    Northbrook argued that such evidence would show that CPC
    knew long before 1979 about the harmful effects of VOC groundwater
    contamination.  Northbrook wanted to introduce certain findings of
    fact contained in the judicial decisions establishing that CPC was
    cleaning up groundwater contamination in its facilities before the
    1970's and that one state court had enjoined CPC from using lagoons
    for waste disposal because of the contamination which resulted.
    CPC responded that circumstances at the Michigan and New Jersey
    sites were very different from those at Peterson/Puritan, and that
    the prejudicial and confusing effect of admitting the decisions
    would far outweigh their probative value.
    The New Jersey case was a coverage suit filed by CPC for
    indemnification of environmental remediation costs incurred during
    the clean-up of three facilities operated by a CPC subsidiary.  All
    three sites had VOC groundwater contamination from the use of
    underground storage tanks and lagoons into which aqueous chemical
    waste residues were deposited.  The Michigan case was a
    consolidated CERCLA action where numerous parties contested
    liability for the cleanup of a dormant manufacturing facility which
    had heavy soil, surface water, and groundwater contamination,
    principally from the use of unlined lagoons as sites for chemical
    waste disposal.
    After extensive voir dire, the district court excluded
    the decisions on Fed. R. Evid. 403 grounds, saying first that their
    introduction would require a "replay of the litigation of those two
    cases," in that the parties would have to argue about the
    similarity of the previous lawsuits to the instant case.  This
    would take "much time and considerable effort, and I think with
    little result."  The court also said that the opinions were not
    relevant to whether CPC could have discovered property damage in
    the exercise of reasonable diligence, because the facts underlying
    the two opinions were different than the facts here; moreover,
    neither opinion addressed the issue of "property damage" as defined
    in the policy.  The court concluded that introduction of the prior
    decisions could prejudice the jury about CPC and its conduct in the
    instant case.
    We start with Northbrook's initial burden of showing that
    the proffered evidence was relevant.  On this, there is
    considerable confusion.  If the proffered evidence plainly showed
    that the other sites involved similar chemicals and similar methods
    of transport and contamination, we could easily find the evidence
    relevant.  But the record is confused and confusing.  It appears
    that the other sites involved largely chemicals which were not
    VOC's at all and included phenols and chlorides.  It also appears
    that the sites did not involve a massive quickly-happening and
    quickly disappearing flood of a chemical, such as the 1974 perc
    spill, but slow seepage and spillage from constantly filled waste
    lagoons.
    But recognizing that knowledge is often gained from
    analogous events as well as from identical events, we will assume
    the evidence was at least somewhat relevant.  Under Rule 403, the
    district judge was then required to determine whether "its
    probative value [was] substantially outweighed by the danger of
    unfair prejudice, confusion of the issues, or misleading the jury,
    or by considerations of undue delay, waste of time, or needless
    presentation of cumulative evidence."
    The dangers of unfair prejudice were certainly real, as
    the trial judge recognized.  "Unfair prejudice," as the Advisory
    Committee Note teaches, means an "undue tendency to suggest
    decisions on an improper basis, commonly, though not necessarily,
    an emotional one."  Northbrook sought to introduce evidence in the
    form of judicial decisions that two other courts had made findings
    that other CPC operations had contaminated groundwater.  Citizens
    do not look fondly on industrial polluters, particularly when the
    industries have been found to be such by a court.  There was a
    danger such evidence would lead to a decision based on emotion or
    a desire to punish.  We have said exclusions under Rule 403 were
    appropriate where such dangers are strong. See United States v.Aguilar-Arancita, 
    58 F.3d 796
    , 800-802 (1st Cir. 1995);  LaPlante
    v. American Honda Motor Co., 
    27 F.3d 731
    , 739-40 (1st Cir. 1994);
    cf. Nickerson v. G.D. Searle & Co., 
    900 F.2d 412
    , 418 (1st Cir.
    1990) (affirming exclusion of questions of medical expert on his
    work in abortion clinics because of danger of an emotional
    reaction).
    By focusing on judicial findings, Northbrook ran into
    other difficulties, ones this court described in Kinan v. City of
    Brockton, 
    876 F.2d 1029
     (1st Cir. 1989).  In Kinan, the plaintiff
    sought to introduce evidence of two previous civil rights actions
    filed against the same police officer whose conduct was the subject
    of the instant suit; the plaintiff sought to introduce those
    previous decisions as proof that the defendant had a custom or
    policy of depriving its citizens of certain constitutional rights.
    See 
    id. at 1033
    .  The district court excluded the evidence.  Seeid.  Kinan affirmed the exclusion on the basis that the evidence,
    even if relevant, would result in jury confusion, wasted time, and
    be unfairly prejudicial.  See 
    id. at 1034-35
    .  Kinan based its
    reasoning in part on the fact that the proffered cases had settled
    prior to trial and were decided on the basis of negotiation, not
    adjudicated findings of fact.  See 
    id.
      While Kinan is far from
    controlling, the dangers warned against in Kinan are real:
    [I]ntroducing evidence of the two other cases
    would inevitably result in trying those cases,
    or at least portions of them, before the jury.
    The merits of the two other cases would become
    inextricably intertwined with the case at bar.
    The result would be confusion and consumption
    of a great deal of unnecessary time.
    
    Id. at 1034
    .  These concerns were echoed by the district court in
    excluding Northbrook's proffered evidence.
    Weighed against this is the seemingly weak probative
    value of the evidence.  In order to strengthen that probative
    value, Northbrook would have had to introduce evidence perfecting
    the analogy of the other sites and chemicals to the ones at issue
    in this trial.  That, in turn, would have led, as the district
    court aptly noted, "to a replay of the litigation of those other
    two cases."  And that, in turn, could have mislead the jury and
    certainly would have caused delay.  The call made by the
    experienced trial judge, who had the look and feel of the trial
    before him, was eminently reasonable and not an abuse of
    discretion.
    C.  Sufficiency of Evidence on Discoverability
    We return to the picture as it was painted for the jury.
    CPC and Northbrook presented two conflicting views of what CPC
    actually knew and what CPC should reasonably have known about
    pollution around the plant and the effect of the perc spill.  Here,
    a jury rejected Northbrook's claim that the state-of-knowledge
    about the dangers of VOC's was such prior to 1979 that CPC was on
    notice about the dangers of groundwater contamination.
    On appeal, Northbrook constructs its argument -- that CPC
    knew or reasonably should have known of that damage before 1979 --
    out of these major elements:
    1.  CPC had actual knowledge of the perc spill in 1974.
    2.  CPC should have known that the perc from the spill
    would enter the groundwater within a few days.
    3.  CPC knew in 1974 that perc was a hazardous substance
    from the Chemical Safety Data Sheets ("CSDS"), which stated that
    "[i]f swallowed, perchlorethylene liquid has toxic effects."
    4.  In 1972, the Manufacturing Chemists Association, the
    distributors of the CSDS for perc, distributed a manual entitled
    "Guidelines For Chemical Plants in Prevention, Control, and
    Reporting of Spills," which warned:
    2.1.6 Pollution of Ground Waters
    While many spills result in detrimental
    effects on sewage treatment systems of surface
    water, some can affect the quality of ground
    waters.  Leaks from storage tanks . . . can
    percolate downward or laterally into shallow
    waters.
    ...
    The geology of the area is an influencing
    factor in determining the migration of spills
    of this type.  Sandy soils are particularly
    subject to percolation of pollutants into
    ground waters
    This statement did not, however, refer specifically to perc.
    CPC opposed Northbrook's account with evidence that there
    was little reason before 1979 to think that a perc spill, or even
    historic releases of VOC's into manholes or catch basins at the
    plant, would descend into the aquifer, move laterally into the
    wellfields, and cause property damage.  CPC put on expert testimony
    that the dangers known to be associated with exposure to perc in
    1979 were of skin contact, inhalation, and possible asphyxiation.
    CPC's experts said that these were the primary dangers that were
    known concerning VOC's.
    As to the pre-1979 state-of-knowledge about responding to
    a perc spill, CPC's evidence was that the earliest literature on
    that particular chemical was information in 1978 from the National
    Firemen's Protection Association.  That information was that such
    spills should be washed down with a fire hose.  Those who actually
    dealt with the 1974 perc spill at the Peterson/Puritan facility
    testified that the company followed the directions of the Rhode
    Island Department of Environmental Management and washed down the
    spill and then covered it over with soil or gravel.  The primary
    risk people were then concerned with was that of fire.  Witnesses
    testified that there was little or no contemporary awareness about
    the risk and effect of groundwater contamination.  Indeed, even as
    of 1979, there were no state or federal standards for impermissible
    levels of perc in drinking water.
    We conclude that the jury could reasonably find, as it
    implicitly did, that the earliest discovered or discoverable
    property damage was the contamination of the Quinnville Wellfield
    which caused it to be closed in 1979.  The evidence did not compel
    a finding in Northbrook's favor.
    D.  The Pollution Exclusion and the Sudden and Accidental Exception
    Having rejected Northbrook's challenge to the jury's
    finding that there was an occurrence within the policy period, we
    turn to its related argument that the property damage resulted from
    activities within the policy's pollution exclusion, i.e., that CPC
    did not meet its burden of proving any "occurrence" was caused by
    a "sudden and accidental" discharge.
    Northbrook does not dispute that the 1974 perc spill was
    sudden and accidental as that term is defined by Rhode Island law.
    Rather, its argument is that the perc spill is beside the point
    because the property damage for which the indemnification is sought
    is from all of the pollution at the Peterson/Puritan site, and this
    pollution is largely the result of the regular and routine
    polluting activities which took place at the plant over many years.
    This pollution included washing waste-water containing chemicals
    down various sinks and drains at the plant which discharged into
    the septic system and leaching fields.  It also includes minor
    leaks and spills that occasionally took place at the chemical tank
    farm, where the spilled chemicals would travel directly through a
    gravel floor into the ground.  Northbrook contends that these
    activities were not sudden and accidental, and thus are not covered
    under the pollution exclusion.  The existence of a single sudden
    and accidental event, Northbrook says, such as the 1974 perc spill,
    does not mean that CPC may avoid the consequences of its on-going
    contamination.
    Northbrook's argument falters on the fact that the jury
    accepted an alternative view of the evidence which has adequate
    support in the record.  This alternate view is that the
    indemnification is sought for clean-up costs mandated by the EPA
    for OU-1 in its efforts to protect and restore the Quinnville
    Wellfield, that the perc spill caused the damage to the wellfield,
    and that remediating the contamination from the perc spill is the
    principal source of the costs -- including, as explained below,
    costs for remediating contamination which originated from routine
    activities at the plant.
    Evidence upon which the jury could rely included the ROD,
    which stated that the wells had not been contaminated before 1979
    and that, but for the contamination, the wells could be reopened.
    Referring to the perc spill, the ROD stated that "this spill, along
    with historical releases into manholes and catch basins, . . . is
    the primary source of contamination." (Emphasis added).  The ROD
    described the wellfield as "a receptor of OU-1 contamination" and
    said that "the potential future use of the wellfield as a drinking
    water source is a realistic possibility."  The ROD thus required
    CPC to clean-up the OU-1 area to drinking water standards -- a
    significant point which emphasizes the EPA's focus on restoring the
    wellfield to use, not merely cleaning the soil (although one is
    prerequisite to the other).
    The jury could also credit evidence that in the period
    before the perc spill such contamination as existed at the plant
    was trapped in the soil and did not migrate into the groundwater,
    and that the perc spill was the vehicle which brought the
    contaminants into the groundwater.  On this point, there was expert
    testimony that the perc spill was responsible: some of the perc
    volatized, forming a large, spreading vapor cloud which moved
    through the soil slowly, dissolving contaminants in its path,
    carrying those contaminants along with it as it descended into the
    groundwater.
    It is true, as Northbrook argues, that under the 1995
    Consent Decree, CPC must carry out the remedy in the ROD including:
    (1) the excavation of contaminated soil in manholes and catch
    basins at the facility; (2) the capping of soil in the tank farm
    and paving of soil in the O'Toole property; and (3) the
    implementation of a soil venting and soil vapor extraction system.
    But the jury apparently believed, on the evidence, that these costs
    were necessitated by the clean-up of the aquifer so that the wells
    could be restored, and that it was primarily the perc spill which
    necessitated that clean-up.
    The evidence does not compel a finding in Northbrook's
    favor on this point.  The jury could reasonably have found that
    contaminants released at the plant would not have caused any
    property damage absent the perc spill, and that the perc spill was
    therefore the real and ultimate cause of the environmental damage
    to the wells.  And the jury could reasonably find that the costs
    incurred by CPC during the EPA-ordered clean-up are for remediating
    pollution so that use of the Quinnville Wellfield might resume.
    In sum, Northbrook's challenge fails.  The issues here
    were for the jury to decide and there was sufficient evidence to
    support the verdict.  See New Castle County v. Hartford Accident
    and Indem. Co., 
    933 F.2d 1162
    , 1192 (3d Cir. 1991).
    E.  Microanalysis
    The parties and the amicus have argued in their appellate
    briefs about "microanalysis."  Northbrook suggests two different
    concepts under the label of "microanalysis."  The first is that
    where there is a history of a pollution-prone operation, it is
    wrong to analyze each single polluting event to determine whether
    it was "unexpected," and thus perhaps subject to characterization
    as "sudden and accidental."  See, e.g., Lumbermens Mut. Cas. Co. v.
    Belleville Indus., Inc., 
    938 F.2d 1423
    , 1427-30 (1st Cir. 1991)
    (rejecting such an approach).  Amicus joins this argument, echoing
    this court in arguing that such an approach would "eviscerate the
    exclusion for pollution."  
    Id. at 1428
    .  Various courts have
    characterized the so-called "microanalysis" approach as attempting
    to "break down [regular polluting activities] into temporal
    components in order to find coverage where the evidence
    unequivocally demonstrates that the pollution was gradual," Smithv. Hughes Aircraft, 
    22 F.3d 1432
    , 1438 (9th Cir. 1993) (internal
    quotation marks omitted); see American States Ins. Co. v.
    Sacramento Plating, Inc., 
    861 F. Supp. 964
    , 971 (E.D. Cal. 1994),
    or as "an ill-fated effort to distinguish between virtually
    indistinguishable occurrences."  Lumbermans Mut. Cas. Co., 
    938 F.2d at 1428
    ; see also Charter Oil Co. v. American Employers' Ins. Co.,
    
    69 F.3d 1160
    , 1170 (D.C. Cir. 1995) (describing approach as attempt
    to "disaggregate" "an activity occurring over an extended period").
    The facts of this case do not invoke any of those perils.  This is
    not an instance of attempting to parse a sequence of events in
    regular polluting activities into component parts and then arguing
    whether each part is sudden and accidental.  Rather, there was a
    massive, sudden and accidental event in the perc spill and it was
    up to the jury to decide whether that, or the ongoing pollution,
    led to the property damage for which indemnification is sought.
    The short answer to Northbrook's first "microanalysis" argument is
    then that this case does not raise that issue at all.
    The second concept Northbrook raises under the label of
    "microanalysis" is whether damages for sudden and accidental
    releases may be parsed out from damages caused by routine, regular
    pollution within the exclusion.  Massachusetts law, for example,
    allows for this possibility where the damage from sudden and
    accidental releases are identifiable and are themselves appreciable
    (or not de minimis) and compensable.  See Highland Ins. Co. v.
    Aerovox, Inc., 
    676 N.E.2d 801
    , 806, 
    424 Mass. 226
    , 234 (1997);
    Nashua Corp. v. First State Ins. Co., 
    648 N.E.2d 1272
    , 1275-76, 
    420 Mass. 196
    , 202-203 (1995); see also Millipore Corp. v. Travelers
    Indem. Co., 
    115 F.3d 21
    , 34 (1st Cir. 1997).  In those cases it was
    in the interest of the insured companies to try to identify and
    carve out a portion of the damages as being attributable to sudden
    and accidental events (for which there was coverage) when the
    general damage suffered was attributable to regular polluting
    activities which were subject to the pollution exclusion (for which
    there was no coverage).  But the doctrine is a two-way street:
    here, it may have been in the insurer's interest to carve out a
    portion of CPC's claim as attributable to regular pollution
    activities (and thus not coverable) against a backdrop of an
    overall damages landscape a jury could have viewed as shaped by one
    sudden and accidental event.  But, as a matter of trial tactics,
    the insurer chose not to raise the issue, and it is waived.  We
    thus have no occasion to predict whether Rhode Island law, which
    governs this case, will adopt a rule similar to the Massachusetts
    rule.
    The decision of the district court is affirmed.