Atlantic Richfield Co. v. Cal. Regional Water Quality Bd. ( 2022 )


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  • Filed 12/5/22 (unmodified opinion attached)
    CERTIFIED FOR PUBLICATION
    IN THE COURT OF APPEAL OF THE STATE OF CALIFORNIA
    THIRD APPELLATE DISTRICT
    (Sacramento)
    ----
    ATLANTIC RICHFIELD COMPANY,                                             C093124
    Plaintiff and Appellant,                      (Super. Ct. No. 34-2014-
    80001875-CU-WM-GDS)
    v.
    ORDER MODIFYING OPINION
    CALIFORNIA REGIONAL WATER QUALITY                            AND DENYING REHEARING
    CONTROL BOARD, CENTRAL VALLEY
    REGION,                                                     [NO CHANGE IN JUDGMENT]
    Defendant and Respondent.
    THE COURT:
    It is ordered that the opinion filed herein on November 15, 2022, be modified as follows:
    On page 35, footnote 6, the last sentence of the footnote, beginning with “In any
    event,” is deleted and the following is inserted in its place:
    We do acknowledge that two Regional Board employees appear to have
    believed in 2011 and 2013 that the Regional Board was at least potentially
    responsible for part of the pollution. This is consistent with the trial court’s
    observations regarding the possibility of financial exposure. However,
    1
    contrary to ARCO’s position in its petition for rehearing, this does not
    mean we are bound by the trial court’s “factual finding of bias.” For the
    reasons already expressed, no such finding was made. In any event, while
    ARCO is correct that we employ the substantial evidence standard of
    review to factual findings, whether the facts of a given case amount to a due
    process violation is primarily a question of law. Indeed, in Today’s Fresh
    Start, the trial court found a financial bias violating due process and our
    Supreme Court independently determined whether due process was
    violated. (See, e.g., Today’s Fresh Start, Inc., supra, 57 Cal.4th at p. 211
    [trial court finds board not impartial decisionmaker]; id. at pp. 212-219
    [independently determining whether due process was violated].)
    There is no change in the judgment. Appellant’s petition for rehearing is denied.
    FOR THE COURT:
    /s/
    DUARTE, Acting P. J.
    /s/
    HOCH, J.
    /s/
    EARL, J.
    2
    Filed 11/15/22 (unmodified opinion)
    CERTIFIED FOR PUBLICATION
    IN THE COURT OF APPEAL OF THE STATE OF CALIFORNIA
    THIRD APPELLATE DISTRICT
    (Sacramento)
    ----
    ATLANTIC RICHFIELD COMPANY,                                      C093124
    Plaintiff and Appellant,                 (Super. Ct. No. 34-2014-
    80001875-CU-WM-GDS)
    v.
    CALIFORNIA REGIONAL WATER QUALITY
    CONTROL BOARD, CENTRAL VALLEY
    REGION,
    Defendant and Respondent.
    APPEAL from a judgment of the Superior Court of Sacramento County, Steven
    M. Gevercer, Judge. Affirmed.
    Farella Braun + Martel, James H. Colopy, John M. Ugai, Tori Timmons; Davis
    Graham & Stubbs, Benjamin B. Strawn; Arnold & Porter Kaye Scholer and Kirk Jenkins
    for Plaintiff and Appellant.
    Rob Bonta, Attorney General, Robert W. Byrne, Assistant Attorney General,
    Tracy L. Winsor, Russell B. Hildreth and Jeffrey P. Reusch, Deputy Attorneys General,
    for Defendant and Respondent.
    1
    This case returns to us for a second time. In Atlantic Richfield Co. v. Central
    Valley Regional Water Quality Control Bd. (2019) 
    41 Cal.App.5th 91
     (Atlantic
    Richfield), we reversed the trial court’s judgment overturning a cleanup order issued by
    the California Regional Water Quality Control Board, Central Valley Region (Regional
    Board). (Id. at p. 100.) As the name suggests, the cleanup order directed Atlantic
    Richfield Company (ARCO) to remediate hazardous waste associated with an abandoned
    mine in Plumas County. The mine was owned by the Walker Mining Company, a
    subsidiary of ARCO’s predecessors in interest, International Smelting and Refining
    Company and Anaconda Copper Mining Company (International/Anaconda). (Id. at
    pp. 93-95.) We held the trial court improperly applied the test articulated in United
    States v. Bestfoods (1998) 
    524 U.S. 51
     (Bestfoods) for determining whether a parent
    company is directly liable for pollution as an operator of a polluting facility owned by a
    subsidiary.
    Imposition of direct liability under Bestfoods requires the parent company to have
    managed, directed, or conducted operations related to leakage or disposal of pollution at
    the facility in question; “[t]he critical question is whether, in degree and detail, actions
    directed to the facility by an agent of the parent alone are eccentric under accepted norms
    of parental oversight of a subsidiary’s facility.” (Bestfoods, supra, 524 U.S. at p. 72.)
    The trial court improperly limited its review of the evidence to International/Anaconda’s
    participation in waste disposal activities at the mine, concluding the Bestfoods standard is
    met only where the parent company participated in or directed activities directly
    involving waste disposal or compliance with environmental regulations. (Atlantic
    Richfield, supra, 41 Cal.App.5th at p. 96.) As we explained, however, “[i]f a parent
    corporation had its fingerprints all over the activities of a facility that resulted in the
    spewing of hazardous waste, it does not make sense to insulate it from liability because it
    eschewed the direction of any efforts the subsidiary might have made otherwise to
    dispose of hazardous waste.” (Id. at p. 97.) We remanded the matter to the trial court for
    2
    “a determination of ARCO’s liability under the proper standard of eccentric control over
    any category of mining activity resulting in toxic discharge, including the [Regional]
    Board’s claim that the activity itself of disturbing the rock strata can generate toxic
    waste.” (Id. at p. 100.)
    On remand, the trial court entered judgment in favor of the Regional Board,
    concluding “[t]he record supports a determination of eccentric control of mining
    ‘operations specifically related to pollution, that is, operations having to do with the
    leakage or disposal of hazardous waste.’ ” ARCO appeals, contending: (1) the trial court
    improperly applied Bestfoods to the facts of this case, resulting in a finding of liability
    that is unsupported by substantial evidence; (2) the Regional Board abused its discretion
    by failing to exclude certain expert testimony as speculative; (3) the Regional Board’s
    actual financial bias in this matter requires invalidation of the cleanup order for violation
    of due process; and (4) the cleanup order erroneously imposed joint and several liability
    on ARCO.
    We affirm. As we explain, the evidence in the record is more than sufficient to
    support the trial court’s conclusion that agents of International/Anaconda, wearing no hat
    other than that of the parent company, exercised eccentric control over mining operations
    at the Walker Mine, resulting in the discharge of toxic waste. 1 ARCO’s evidentiary
    claim also lacks merit. The Regional Board did not abuse its discretion in considering the
    challenged expert testimony because that testimony was not “based on a leap of logic or
    conjecture”; nor was it “ ‘clearly invalid and unreliable’ expert opinion.” (Sargon
    Enterprises, Inc. v. University of Southern California (2012) 
    55 Cal.4th 747
    , 772
    (Sargon).) We also reject ARCO’s assertion that its due process rights were violated
    because the Regional Board was not a fair and neutral arbiter of whether or not a cleanup
    1     In addressing this claim, we also reject ARCO’s related claim that the trial court
    erroneously denied its request for a statement of decision.
    3
    order should issue in the first instance. ARCO has not carried its appellate burden of
    showing the Regional Board possessed a financial interest in issuing the order. Finally,
    nothing in the statutory scheme prevents the Regional Board from ordering ARCO, and
    ARCO alone, to clean up the site contaminated by its predecessors.
    BACKGROUND
    We previously provided an overview of the historical facts and summary of the
    Regional Board’s cleanup order in Atlantic Richfield, supra, 
    41 Cal.App.5th 91
    :
    “J. R. Walker began developing the Walker Mine in 1909, located to the north of
    Quincy and Portola in Plumas County. It is within the drainage of a watershed feeding
    ultimately into the north fork of the Feather River.
    “The Walker Mining Company took title in 1915 and commenced mining in 1916.
    At one point in the 1930s, this was the largest copper mine in California.
    “International Smelting and Refining Company was a wholly owned subsidiary of
    the Anaconda Copper Mining Company, which later swallowed International in a merger.
    International/Anaconda acquired a controlling interest in the Walker Mining Company in
    1918. Ultimately, ARCO became a successor through Anaconda’s merger with an
    ARCO subsidiary in 1977 and the subsidiary’s merger with ARCO in 1981. [Citation.]
    “The mine ceased production in 1941 and ceased all operations in 1943, after
    producing six million tons of ore. The assets of the Walker Mining Company were sold
    in bankruptcy proceedings in 1945 and transferred to subsequent owners over the
    decades; the [Regional] Board reached a settlement with the current owner of the
    property in 2004, which at present appears to be an inactive and insolvent corporation.
    By virtue of this and an earlier settlement against a previous owner, the [Regional] Board
    has a right of access to the property under which it can authorize ARCO to conduct
    remediation activities.
    “The mine has 13 miles of flooded underground workings, comprising a total void
    volume estimated at 543 million gallons. The mine openings and tailings on the site
    4
    discharge soluble copper and acidic mine drainage into surface waters, at times
    eliminating aquatic life 10 miles downstream from the mine. In 1987, the [Regional]
    Board installed a concrete plug at a mine opening that was a primary source of mine
    leakage, which has eliminated most of the direct discharge but is causing a buildup of
    contaminated water inside the mine that is leaching into groundwater, and the mining
    waste on the surface also continues to be a source of water pollution.
    “The [Regional] Board concluded that the mine and its tailings ‘have discharged
    metals and acid mine drainage’ into the watershed ‘from at least the time production
    ceased in 1941, if not earlier.’ The ARCO predecessors ‘concurrently managed, directed,
    or conducted operations specifically related to the leakage or disposal of waste’ in
    tandem with the Walker Mining Company. The activities ‘included exploration, ore
    location, mine development work . . . , and removal of ore, all of which directly resulted
    in the condition of discharge . . . at the mine and tailings.’ This involvement ‘went well
    beyond what is normally expected of a . . . corporate parent.’ The [Regional] Board also
    concluded that the ARCO predecessors directly discharged waste from their own mining
    activities from 1916 to 1918. It therefore ordered ARCO to investigate and remediate the
    hazardous waste associated with the Walker Mine.” (Atlantic Richfield, supra, 41
    Cal.App.5th at pp. 94-95.)
    The Regional Board’s cleanup order was issued in March 2014. ARCO petitioned
    the trial court to overturn the order. The trial court granted the petition in January 2018.
    (Atlantic Richfield, supra, 41 Cal.App.5th at pp. 93-94.) As stated previously, in Atlantic
    Richfield, we reversed and remanded the matter to the trial court to determine “ARCO’s
    liability under the proper standard of eccentric control over any category of mining
    activity resulting in toxic discharge,” not just activity involving waste disposal or
    environmental regulation compliance. (Id. at p. 100.)
    On remand, the Regional Board relied on the following evidence in the
    administrative record to support its conclusion that International/Anaconda exercised
    5
    eccentric control over ore extraction at the Walker Mine, resulting in the toxic pollution
    described above:
    In a September 1923 letter from Paul Billingsley, a geologist at Anaconda, to J. O.
    Elton, who served both as general manager of International’s smelter in Utah and as vice
    president of the Walker Mining Company, Billingsley expressed concern that the Walker
    Mining Company’s manager, V. A. Hart, was not following the “recommendations” of
    Anaconda’s geological department. As the Regional Board’s industrial historian, Fredric
    L. Quivik, Ph.D., explained, “the office of vice president of a subsidiary is often key in
    giving the parent a conduit for directing the subsidiary’s manager of operations.”
    In a letter from Anaconda’s chief geologist, Reno Sales, to Billingsley, dated six
    days after the letter from Billingsley to Elton, Sales referred to these recommendations as
    “instructions” and more forcefully stated the problem from the perspective of Anaconda’s
    geological department: “I don’t see how things will be any better unless Hart is made to
    follow instructions. . . . I get rather provoked at the frequent request that you . . . go there
    and as far as I can see the developments at the mine are carried on just about as Hart
    wants them.” The letter continued: “Hart insists upon being his own geologist and
    apparently doesn’t want to take any advice or instructions from this office. I insist that if
    we are to be held responsible, Mr. Hart is going to do things the way we want him to, he
    is going to keep us informed of developments so that we can watch what is going on from
    our department rather than waiting for these difficulties to come up through Elton. It
    should not be necessary for Elton to be bothered with matters of this sort and he can be
    relieved of it if he will make certain that Hart obeys instructions as to prospecting and
    development given by this department.”
    The following month, Billingsley wrote to Hart with specific “recommendations”
    for excavating the mine in search of ore, e.g., “Continue exploration of shear zone at
    North end of 600 level by means of straight drift with cross-cuts in both directions at
    6
    intervals of 100 feet.” Billingsley also stated: “You may consider this letter as your
    authorization to start the above work.”
    Additional recommendations from the Anaconda geological department were
    provided both to Elton and to Walker Mining Company’s new manager, I. L. Greninger,
    in 1924. In November of that year, Sales wrote to William Wraith, who was both an
    executive at Anaconda (in charge of overseeing various mining projects) and also a vice
    president of the Walker Mining Company (along with Elton). A portion of this letter
    reads: “I know the Geological Department will not be held responsible for mining
    operations at the Walker. I do not want you to feel that I am criticizing the mining end. I
    may differ from you in opinion as to the proper method of prospecting certain areas, but
    in the final say so as to how it will be done I certainly am always glad and willing to
    leave it to the mine management. But the Geological Department has in the past been
    held responsible, to some degree at least, for prospecting and development work, and
    whenever I see drifts run in waste when they should be in ore, or at least should be in the
    vein; and crosscuts run that are useless, I am going to kick, anyhow as long as this
    department has anything to do wit[h ]it.”
    In May 1925, Sales wrote to Tom Lyon, a geologist at International, asking Lyon
    to write a letter to the Walker Mining Company’s new manager, Herbert R. Tunnell,
    adding: “I want Tunnell to see your letter so that he may fully understand and agree with
    the recommendations made.” A series of August 1925 letters between Lyon and Tunnell
    indicate that Lyon, on behalf of International, was now approving recommendations
    made by Tunnell with respect to specific mining activity at the Walker Mine.
    For example, an August 25 letter from Lyon indicates that he received a previous
    letter from Tunnell “regarding the proposed development work” and then provides
    detailed instructions regarding crosscutting at various ends and depths of the mine,
    adding: “The location for winzes that you have selected are satisfactory. I think,
    however, that the work should all be done in the vein. The water problem should not be
    7
    worse in the vein than in the schist as one is as porous as the other and the only water that
    should be expected would come from cracks or faults which are liable to occur in either
    the vein or the schist.” In response, Tunnel wrote to Lyon: “Regarding the proposed
    shaft and winze, I believe we should do the preliminary work at once and as you approve
    the locations suggested in my letter we will get the hoists installed as soon as possible.”
    The following day, apparently before receiving the previous letter, Lyon wrote to
    Tunnell, stating: “By this time you have my letter of August 25th regarding the
    development work proposed by you. I think that letter will give you authority to proceed
    with the winzes as you are able. Crosscutting east and west at the north end of the
    property may proceed when the north drift on the six hundred [level] has advanced far
    enough to be beneath the central portion of the large mineralized area exposed on the
    surface.”
    The following month, Lyon wrote to Tunnell: “Mr. Billingsley is now back and
    will visit the Walker mine next week and will take up the matter of development work at
    that time. [¶] During the interval you are authorized to drift north and south on the ore
    disclosed by crosscut 647 S.” Tunnell thereafter acknowledged receipt of this
    authorization.
    In February 1926, Tunnell wrote to Billingsley, now International’s chief
    geologist, providing an update on work being done at the Walker Mine. Tunnell
    explained that the work was being done with the approval of William Daly, Anaconda’s
    top mining engineer, and closed the letter with: “I hope the work outlined above meets
    with your approval . . . .”
    The next piece of correspondence relied upon by the Regional Board in support of
    International/Anaconda exercising eccentric control over mining operations at the Walker
    Mine is from more than a decade later, March 1937. In the interim, the Great Depression
    weakened the market for copper, resulting in suspension of operations at the Walker
    8
    Mine from 1932 to 1935. The mine operated intermittently thereafter until it ceased
    production in 1941.
    In March 1937, Seth Droubay, the Walker Mining Company’s chief engineer and
    geologist, wrote to Lyon, now International’s chief geologist, presenting a “proposed
    development program” for the Walker Mine. Ten days later, Lyon indicated Droubay’s
    “recommendations” were approved in a letter to John F. Dugan, International’s
    superintendent of mines.
    In a December 1938 letter from Sales to Lyon, Sales informed Lyon that a certain
    specific proposal from Droubay, i.e., “the hanging wall crosscut on the 1000 foot level to
    be driven from 1017 Drift at a point just to the north of coordinate 15800,” was approved,
    but “we do not approve of the work on or from the 1100 foot level as outlined by
    Droubay.” Two days later, Dugan wrote a letter to Clyde E. Weed, Anaconda’s general
    manager of mines, indicating that he had received this approval, but seeking clarification
    with respect to “whether or not you intended to do any drilling” once the crosscut was
    cut.
    In January 1939, Droubay submitted additional recommendations regarding
    specific mining activities to Lyon and indicated he would also send them to Dugan, “and
    tell him they are subject to your approval.” That April, Droubay wrote to Lyon
    confirming three of these recommendations were completed.
    In May 1941, Dugan wrote to Sales asking whether further development, “either
    by drifting, crosscutting or diamond drilling,” would be occurring on the 1,200-foot level
    of the mine. In response, Sales informed Dugan that he would discuss the matter with
    Weed and “advise you of our decision.” In July, having not yet received a decision,
    Dugan again wrote to Sales seeking “your early decision as to development work, for if
    no further work is contemplated on the 1200, we will salvage the equipment . . . .”
    Dugan also attached a copy of a letter he received from Henry Hartmann, the Walker
    Mining Company’s new manager, which apparently also inquired about abandonment of
    9
    the 1,200-foot level. Sales responded: “I have talked with Weed about the 1200 Walker.
    We concur in the opinion of yourself and Hartmann, that this level should be temporarily
    abandoned. This means that you may pull out such tracks, pipes, etc., as is deemed
    advisable, and also stop pumping from that level.”
    As Dr. Quivik explained, neither Sales, Lyon, nor Weed had any official role at
    the Walker Mining Company.
    The Regional Board argued below: “These documents show active direction of
    mining activity, leading to leakage or disposal of waste, going far beyond mere
    monitoring of a financial investment. International and Anaconda employees were
    making critical decisions about where to mine, how to mine, and when to stop mining,
    demonstrating total control of the mining enterprise and day-to-day operations.”
    The trial court agreed with the Regional Board and rejected ARCO’s specific
    argument that International/Anaconda merely offered solicited “advice” to the Walker
    Mining Company concerning the first two phases of mining activity, “development and
    exploration,” which “did not result in the pollution at issue” in this case. The trial court
    explained: “While ARCO repeatedly argues any eccentric control merely concerned
    exploration and development, the Court finds ARCO’s use of the term ‘development’ is
    too broad and actually encompasses activities that constituted ore extraction.
    International/Anaconda clearly took a role in the day to day happenings at Walker mine
    that exceeded a traditional parent corporation role such that they managed, directed, or
    conducted operations on behalf of Walker Mining Company. (See Bestfoods, 
    supra,
     524
    U.S. at pp. 66-67.) The Court finds that this control occurred in phase three of mining,
    ore extraction, which activities resulted, at least in part, in the toxic discharge at issue in
    the [cleanup order].”
    Additional relevant portions of the trial court’s ruling, as well as evidence adduced
    by ARCO during the hearing before the Regional Board, will be set forth in the
    discussion portion of this opinion, to which we now turn.
    10
    DISCUSSION
    I
    ARCO’s Direct Liability for the Pollution
    ARCO’s central contention in this appeal is that the judgment must be reversed
    because the trial court incorrectly applied Bestfoods, supra, 
    524 U.S. 51
    , to the facts of
    this case, resulting in a finding of liability that is unsupported by substantial evidence.
    ARCO is mistaken.
    A.
    Standard of Review
    A trial court reviews a cleanup order issued under Water Code 2 section 13304
    using the independent judgment standard of review. (Sweeney v. California Regional
    Water Quality Control Bd. (2021) 
    61 Cal.App.5th 1093
    , 1111-1112 (Sweeney).) “ ‘In
    exercising its independent judgment, a trial court must afford a strong presumption of
    correctness concerning the administrative findings, and the party challenging the
    administrative decision bears the burden of convincing the court that the administrative
    findings are contrary to the weight of the evidence.’ [Citation.]” (Building Industry
    Assn. of San Diego County v. State Water Resources Control Bd. (2004) 
    124 Cal.App.4th 866
    , 879 (Building Industry).) Unlike substantial evidence review, the trial court “ ‘does
    not defer to the fact finder below and accept its findings whenever substantial evidence
    supports them. Instead, it must weigh all the evidence for itself and make its own
    decision about which party’s position is supported by a preponderance. [Citation.] The
    question is not whether any rational fact finder could make the finding below, but
    whether the reviewing court believed the finding actually was correct.’ [Citation.]”
    2      Undesignated statutory references are to the Water Code.
    11
    (Coastal Environmental Rights Foundation v. California Regional Water Quality Control
    Bd. (2017) 
    12 Cal.App.5th 178
    , 188.)
    On appeal, “this court reviews the trial court’s decision on the [cleanup order] for
    substantial evidence supporting the trial court’s findings.” (Sweeney, supra, 61
    Cal.App.5th at p. 1112; Barclay Hollander Corp. v. California Regional Water Quality
    Control Bd. (2019) 
    38 Cal.App.5th 479
    , 498 (Barclay Hollander).) “In substantial
    evidence review, the reviewing court defers to the factual findings made below. It does
    not weigh the evidence presented by both parties to determine whose position is favored
    by a preponderance. Instead, it determines whether the evidence the prevailing party
    presented was substantial—or, as it is often put, whether any rational finder of fact could
    have made the finding that was made below. If so, the decision must stand.” (Alberda v.
    Board of Retirement of Fresno County Employees’ Retirement Assn. (2013) 
    214 Cal.App.4th 426
    , 435.)
    Questions of law, of course, are reviewed de novo. “[W]e are not bound by the
    legal determinations made by the state or regional agencies or by the trial court.
    [Citation.] But we must give appropriate consideration to an administrative agency’s
    expertise underlying its interpretation of an applicable statute.” (Building Industry,
    supra, 124 Cal.App.4th at p. 879, fn. omitted.)
    With these standards in mind, we shall elucidate the Bestfoods standard and then
    determine whether or not substantial evidence supports the trial court’s dispositive
    findings, specifically that ARCO’s predecessors, International/Anaconda, “managed,
    directed, or conducted operations” at the Walker Mine that “occurred in phase three of
    mining, ore extraction, which activities resulted, at least in part, in the toxic discharge at
    issue in the [cleanup order].”
    12
    B.
    ARCO’s Request for a Statement of Decision
    ARCO claims the trial court erroneously denied its request for a statement of
    decision, and therefore, “Code of Civil Procedure section 634 does not permit [this court]
    to imply any findings in the [Regional] Board’s favor.” 3 We disagree.
    “The time for requesting a statement of decision is governed by Code of Civil
    Procedure section 632 . . . , which provides in pertinent part as follows: ‘The request
    must be made within 10 days after the court announces a tentative decision unless the
    trial is concluded within one calendar day or in less than eight hours over more than one
    day in which event the request must be made prior to the submission of the matter for
    decision.’ ” (In re Marriage of Gray (2002) 
    103 Cal.App.4th 974
    , 977 (Marriage of
    Gray).) “A hearing on a petition for writ of mandamus is a ‘trial of a question of fact’ for
    purposes of [this section].” (Kearl v. Board of Medical Quality Assurance (1986) 
    189 Cal.App.3d 1040
    , 1050 (Kearl); see also Bevli v. Brisco (1985) 
    165 Cal.App.3d 812
    , 820
    (Bevli).)
    The hearing before the trial court following our remand of the matter occurred on
    August 21, 2020, and lasted 79 minutes. An 18-page ruling was filed on September 4.
    On September 23, ARCO filed a request for a statement of decision, seeking “the factual
    and legal bases” for 46 specific “controverted issues” covering seven topics, from
    3       The Regional Board asserts this argument is “waived,” or more accurately,
    forfeited (see People v. Williams (1999) 
    21 Cal.4th 335
    , 340, fn. 1), because ARCO did
    not properly raise this claim in its opening brief. The argument that ARCO’s request for
    a statement of decision was improperly denied was made in the section of the brief
    detailing the procedural background, not in the argument section of the brief, and the
    subsection raising this claim does not inform this court what relief ARCO is seeking for
    this purported error. That information is provided in a footnote in the standard of review
    section. In ARCO’s reply brief, however, the argument is presented under a separate
    heading, as are each of the other arguments. While the opening brief’s organizational
    structure is less than ideal, we do not consider the argument forfeited.
    13
    Bestfoods liability to the admissibility of Dr. Quivik’s expert testimony to the doctrine of
    laches. Two days later, the trial court denied the request as untimely, explaining:
    “Because the trial (a hearing on the merits) in this matter concluded within one calendar
    day, the request needed to be made prior to the submission of the matter for decision.
    [Citations.] Here, the request was made 33 days after the Court took this matter under
    submission and 15 days after the Court served its final ruling. Accordingly, [ARCO’s]
    request is denied as untimely.” ARCO then filed a motion for new trial based solely on
    the trial court’s denial of its request for a statement of decision. The trial court denied
    this motion as well.
    Relying on Bevli, supra, 
    165 Cal.App.3d 812
    , ARCO argues its request for a
    statement of decision was timely. In Bevli, the trial judge stated on the record that he had
    spent 13 hours reading the administrative record and the Court of Appeal concluded that
    the time spent reviewing the record must be considered “trial time for the purposes of
    findings under Code of Civil Procedure section 632.” (Id. at p. 822.) Similarly, ARCO
    argues, it would be “impossible” for the trial in this case to have lasted only one day
    because the hearing itself lasted 79 minutes, “[p]reparation of the 18-page ruling surely
    required several hours,” and “[e]ven with an improbable assumption that the Court
    needed only four hours to prepare its ruling, that would leave two hours and 41 minutes
    to review the 11,672-page record, which would mean reading 4,349 pages per hour, or 72
    pages per minute, or less than one second per page‒a physical and mental impossibility.”
    ARCO’s reliance on Bevli is misplaced for two reasons. First, Code of Civil
    Procedure section 632 was amended in 1987, after Bevli was decided, to include within
    its ambit “a trial taking eight hours over more than one calendar day,” thereby making
    clear that “an eight-hour trial is considered a one-day trial.” (Gorman v. Tassajara
    Development Corp. (2009) 
    178 Cal.App.4th 44
    , 63.) The Gorman court explained: “The
    reality is that trial judges spend additional time off the bench preparing for hearings,
    researching the law, and reading motions and briefs, but the statute indicates an intent not
    14
    to count that time as trial time. Otherwise the trial judge would have to submit
    timesheets to the parties in a case so they would know when to request a statement of
    decision. The parties may be expected to know and add up the time they have spent in
    court hearings on a case, but not how long the judge has considered the case outside of
    the courtroom.” (Ibid.)
    In Marriage of Gray, supra, 
    103 Cal.App.4th 974
    , after noting that Bevli was
    decided before the 1987 amendment to Code of Civil Procedure section 632, this court
    distinguished Bevli because it involved an administrative mandamus proceeding and
    “decline[d] to extend Bevli’s timing rule to other civil proceedings . . . in light of the 1987
    amendment,” explaining: “We cannot realistically expect trial judges to keep
    stopwatches to record time spent off the bench in chambers, a home office, or at the
    kitchen table studying the law and evidence. Rather, the eight-hour rule in section 632
    requires a simple and obvious mode of timekeeping that everyone, including attorneys,
    can keep track of. This means that, for purposes of keeping time of trial under section
    632 in civil proceedings other than administrative mandamus (an issue not before us), the
    time of trial means the time that the court is in session, in open court, and also includes
    ordinary morning and afternoon recesses when the parties remain at the courthouse. It
    does not include time spent by the judge off the bench without the parties present—lunch,
    for example—except for such routine recesses as occur during the day. Measured by this
    test, appellant has not shown the trial court erred in its finding that the instant trial lasted
    less than eight hours over more than one day.” (Marriage of Gray, at pp. 979-980.)
    Unlike Gorman and Marriage of Gray, this case arises out of a petition for writ of
    mandate seeking to overturn an order issued by an administrative agency. However,
    because we are in agreement with everything those decisions had to say about the 1987
    amendment to Code of Civil Procedure section 632, we must question the continuing
    validity of Bevli, even where a trial court must review relevant portions of a lengthy
    administrative record.
    15
    In any event, even assuming Bevli remains good law, and “trial [time] included not
    only the hearing but the time spent in reviewing the administrative record,” in this case,
    as was also the case in Kearl, supra, 
    189 Cal.App.3d 1040
    , “the record does not reflect
    the amount of time expended by the trial court in this regard.” (Id. at p. 1051.) The
    Kearl court explained: “It is fundamental that an appellant ‘must affirmatively show
    error by an adequate record. . . . Error is never presumed. . . . “A judgment or order of
    the lower court is presumed correct. All intendments and presumptions are indulged to
    support it on matters as to which the record is silent . . . .” (Orig. italics.)’ [Citation.] . . .
    This court cannot speculate as to the amount of time spent. [Citation.] [¶] Inasmuch as
    petitioner has not met his burden of affirmatively showing error on the record, this court
    must presume the lower court’s ruling was correct, i.e., that the trial lasted less than one
    day and petitioner’s request for a statement of decision was untimely.” (Id. at pp. 1051-
    1052.)
    ARCO similarly asks this court to speculate about the amount of time the trial
    court spent reviewing the admittedly lengthy administrative record in this case. To be
    sure, reading each of nearly 12,000 pages of administrative record in less than eight hours
    would have been an impossible feat, but we cannot speculate that the trial court read each
    and every page. We must be realistic. Each page of an administrative record is not
    created equal. It would not have been impossible to read the portions of administrative
    record that we have found to be important to our decision in this appeal in that amount of
    time. Because it would require sheer speculation on our part to divine the amount of time
    the trial court actually spent reviewing the administrative record, we must presume the
    “trial” in this case lasted less than eight hours. ARCO has not carried its appellate burden
    of demonstrating its request for a statement of decision was timely.
    16
    C.
    The Bestfoods Standard
    In Bestfoods, supra, 
    524 U.S. 51
    , the United States Supreme Court held a
    corporate parent of a subsidiary that operates a polluting facility may not be held liable
    for the pollution solely because it actively participated in and exercised control over the
    subsidiary; such indirect liability may not be imposed unless the corporate veil may be
    pierced. (Id. at p. 55.) However, “a corporate parent that actively participated in, and
    exercised control over, the operations of the facility itself may be held directly liable in
    its own right as an operator of the facility.” (Ibid.) With respect to direct operator
    liability, the court clarified, “an operator must manage, direct, or conduct operations
    specifically related to pollution, that is, operations having to do with the leakage or
    disposal of hazardous waste, or decisions about compliance with environmental
    regulations.” (Id. at pp. 66-67.)
    Thus, where the alleged operator is a corporate parent, “ ‘[t]he question is not
    whether the parent operates the subsidiary, but rather whether it operates the facility, and
    that operation is evidenced by participation in the activities of the facility, not the
    subsidiary. . . .’ [Citations.]” (Bestfoods, supra, 
    524 U.S. 51
     at p. 68, italics added.)
    Operating a facility, the court further clarified, “obviously mean[s] something more than
    mere mechanical activation of pumps and valves, and . . . includ[es] the exercise of
    direction over the facility’s activities.” (Id. at p. 71.) However, it is not enough that a
    corporate parent places its own high-level officials in key positions at the subsidiary, and
    those individuals conducted operations at the facility. This is because “ ‘directors and
    officers holding positions with a parent and its subsidiary can and do “change hats” to
    represent the two corporations separately . . . .’ [Citations.]” (Id. at p. 69.) At the same
    time, parental operation of the facility occurs where “the parent operates the facility in
    the stead of its subsidiary or alongside the subsidiary in some sort of a joint venture,” or
    where “a dual officer or director . . . depart[s] so far from the norms of parental
    17
    influence” over the subsidiary that his or her actions in operating the facility actually
    “serve the parent, even [though] ostensibly acting on behalf of the subsidiary,” or where
    “an agent of the parent with no hat to wear but the parent’s hat . . . manage[s] or direct[s]
    activities at the facility.” (Id. at p. 71.)
    The court concluded its explication of the proper standard for imposing direct
    operator liability by explaining: “ ‘Activities that involve the facility but which are
    consistent with the parent’s investor status, such as monitoring of the subsidiary’s
    performance, supervision of the subsidiary’s finance and capital budget decisions, and
    articulation of general policies and procedures, should not give rise to direct liability.’
    [Citation.] The critical question is whether, in degree and detail, actions directed to the
    facility by an agent of the parent alone are eccentric under accepted norms of parental
    oversight of a subsidiary’s facility.” (Bestfoods, 
    supra,
     
    524 U.S. 51
     at p. 72.)
    Applying this standard, the court noted the district court’s decision “speaks of an
    agent of [the parent corporation] alone who played a conspicuous part in dealing with the
    toxic risks emanating from the operation of the plant.” (Bestfoods, 
    supra,
     
    524 U.S. 51
     at
    p. 72.) This agent, Williams, the parent corporation’s governmental and environmental
    affairs director, “worked only for [the parent corporation]; he was not an employee,
    officer, or director of [the subsidiary], [citation], and thus, his actions were of necessity
    taken only on behalf of [the parent]. The District Court found that ‘[the parent
    corporation] became directly involved in environmental and regulatory matters through
    the work of . . . Williams, . . . [who] became heavily involved in environmental issues at
    [the subsidiary].’ [Citation.] He ‘actively participated in and exerted control over a
    variety of [the subsidiary’s] environmental matters,’ [citation] and he ‘issued directives
    regarding [the subsidiary’s] responses to regulatory inquiries,’ [citation].” (Ibid.) The
    court concluded “these findings are enough to raise an issue of [the parent’s] operation of
    the facility through Williams’s actions” and remanded the matter with instructions to
    return it to the District Court “for reevaluation of Williams’s role, and of the role of any
    18
    other [parent corporation] agent who might be said to have had a part in operating the
    [polluting] facility.” (Id. at pp. 72-73.)
    D.
    Analysis
    The evidence presented below is sufficient to support the trial court’s conclusion
    that International/Anaconda directed operations at the Walker Mine specifically related to
    pollution. We decline to recapitulate the correspondence recounted previously. The
    following outline of its contents will suffice. While the correspondence from late 1923 to
    the middle of 1925 is somewhat ambiguous with respect to whether “recommendations”
    made by agents of International/Anaconda were in fact “instructions,” it appears that
    managers at the Walker Mining Company were not following them regardless of what we
    call them. However, beginning in August 1925, after the Walker Mining Company’s
    manager position transitioned from Hart to Greninger to Tunnell, an agent of
    International, Lyon, with no position at the Walker Mining Company, began approving
    recommendations made by Tunnell with respect to specific mining activity at the Walker
    Mine. Agents of International/Anaconda continued approving specific mining
    recommendations made by agents of the Walker Mining Company after the mine
    temporarily closed during the Great Depression. Hartmann and Droubay, the Walker
    Mining Company’s manager and chief engineer/geologist, respectively, received
    approvals and disapprovals of specific mining activity from Lyon, Sales, and/or Weed,
    none of whom had any official role at the Walker Mining Company. The correspondence
    makes clear that mining activity at the Walker Mine was being conducted at the direction
    of these agents of International/Anaconda. This is precisely the sort of eccentric control
    that was at issue in Bestfoods.
    Nevertheless, ARCO argues that this evidence merely establishes the “typical
    parent-shareholder advice, consultation and financial oversight that cannot constitute
    eccentric control.” In making this argument, ARCO relies primarily on Trinity
    19
    Industries, Inc. v. Greenlease Holding Co. (3d Cir. 2018) 
    903 F.3d 333
     (Trinity
    Industries) and Atlanta Gas Light Co. v. UGI Utilities, Inc. (11th Cir. 2006) 
    463 F.3d 1201
     (Atlanta Gas Light). Such reliance is misplaced.
    In Trinity Industries, the Third Circuit Court of Appeals affirmed the district
    court’s determination, on summary judgment, that parent corporation Ampco-Pittsburgh
    Corporation (Ampco) was not directly liable for lead contamination at its subsidiary
    Greenlease Holding Co.’s (Greenlease) North Plant. (Trinity Industries, supra, 903 F.3d
    at p. 360.) The court explained: “The District Court rightly determined that the record
    here would not permit a reasonable fact-finder to conclude that Ampco’s involvement in
    the day-to-day operations of the North Plant exceeded ‘the normal relationship between
    parent and subsidiary,’ [citation], in a manner that would support holding Ampco directly
    liable for Greenlease’s conduct. The undisputed facts establish, rather, that ‘[Greenlease]
    employees were responsible for all day-to-day operations at the North Plant, including
    any waste disposal, waste handling, painting, abrasive blasting, welding, and fabrication
    operations.’ [Citation.] Greenlease employees, not Ampco employees, coordinated
    disposal with outside contractors and communicated with [state regulators] on
    environmental matters. In fact, Ampco ‘did not employ any engineers or persons with
    technical experience in manufacturing that could make decisions for [Greenlease] with
    respect to environmental compliance or waste management.’ [Citation.] Instead,
    ‘Ampco employed only a professional staff, such as accountants, actuaries, and
    lawyers[.]’ [Citation.] Helping with administrative work is consistent with a typical
    parent-subsidiary relationship, and certainly does not establish Ampco’s direct
    involvement with the North Plant, which Bestfoods demands to hold a parent directly
    liable for environmental cleanup costs.” (Id. at p. 364.) The court also rejected the
    argument that Ampco “crossed the line into operating the North Plant” (id. at p. 364) by
    providing Greenlease with advice regarding the laws and regulations related to
    Greenlease’s waste generation, monitoring that waste generation, and also becoming
    20
    involved in plans to increase production capacity and modernize the North Plant. (Id. at
    pp. 343, 364.) The court viewed such activities as “ ‘consistent with the parent’s investor
    status . . . .’ ” (Id. at p. 364, quoting Bestfoods, supra, 524 U.S. at p. 72, fn. omitted.)
    Here, International/Anaconda did more than provide administrative assistance,
    offer financial and legal advice, and monitor the activities of their investment, the Walker
    Mining Company. Unlike Ampco, International/Anaconda did employ persons with
    technical experience in copper mining. As we have explained, these individuals directed
    specific mining activities at the Walker Mine, and they did so wearing only the hat of
    their employer, International and Anaconda, respectively. Trinity Industries is therefore
    inapposite.
    In Atlanta Gas Light, the Eleventh Circuit Court of Appeals affirmed the district
    court’s determination, also on summary judgment, that parent corporation CenterPoint
    Energy Resources Corporation (CenterPoint) was not directly liable for pollution at its
    subsidiary St. Augustine Gas and Electric Light Company’s (St. Augustine Gas)
    manufactured gas plant. (Atlanta Gas Light, supra, 463 F.3d at p. 1208.) The court was
    not persuaded by the argument that CenterPoint’s actions of replacing St. Augustine Gas
    officers and directors with CenterPoint senior executives and entering into engineering
    and management contracts with St. Augustine Gas rendered CenterPoint an operator of
    the plant within the meaning of Bestfoods. (Id. at p. 1206.) With respect to the
    overlapping officers and directors, the court explained this was “not inconsistent with
    corporate norms.” (Id. at p. 1207.) Turning to the engineering and management
    contracts, the court explained the former contemplated “general engineering advice and
    assistance,” as well as “design, supervision and construction on substantial additions,
    extensions and alterations,” but did not contemplate “operation of the plant.” (Ibid.) The
    latter contract, although “labeled a ‘management’ contract,” was rather “in the nature of
    advice and consultation.” (Ibid.) Moreover, while a CenterPoint officer, Traver, with no
    apparent official role at St. Augustine Gas, described himself as “the ‘sponsor’ and
    21
    ‘engineer’ for the St. Augustine Gas plant,” the court viewed his testimony delineating
    his role as being “consistent with the above description of the contracts,” i.e., “he
    consulted by telephone with the local management . . . 3-4 times per week” and “made an
    on-site visit . . . 6-7 times a year,” but “did not operate the St. Augustine facility” on
    behalf of CenterPoint. (Id. at pp. 1207-1208.)
    Here, again, Lyon, Sales, and Weed did more than consult with Walker Mining
    Company management and offer their advice with respect to exploration and
    development at the Walker Mine. That may have been how the relationship began. As
    stated previously, from late 1923 to the middle of 1925, it appears that managers at the
    Walker Mining Company were not following the “recommendations” or “instructions” of
    International/Anaconda, to the great consternation of the parent companies. By August
    of 1925, however, agents of International/Anaconda were actively directing specific
    mining activities at the mine.
    ARCO further argues that even if International/Anaconda can be said to have
    directed operations at the Walker Mine, they did so only with respect to “the exploration
    and development phases of mining,” and these phases did not result in pollution. We are
    not persuaded.
    ARCO relies on testimony from its mining and geological experts, Terry McNulty
    and Marc Lombardi. Their relevant testimony, as summarized by ARCO in the opening
    brief, was as follows: “[T]he exploration phase constitutes the extraction of core samples
    to ‘delineat[e] the three dimensional geometry and grade of the ore’ [citation], followed
    by the development phase ‘to create a path through the country rock adjacent to the vein.’
    [Citation.] Development can include sinking ‘vertical shafts’ from the ground surface
    [citation], or driving horizontal openings referred to as ‘drifts or crosscuts,’ ‘inclines or
    declines’ or ‘raises or winzes’ off of ‘a haulage tunnel to a location near or in
    mineralization.’ [Citation.] [¶] Ore extraction, however, as Dr. McNulty explained,
    refers to ‘breaking and removing ore from the mine workings.’ [Citation.] Miners drill
    22
    holes into the mineralized rock, blast the mineralized rock and load the broken
    mineralized rock into rail cars to tram to the surface.”
    The structure of ARCO’s argument is threefold. First, ARCO argues the trial
    court “erroneously combined the development and ore extraction phases” when it found
    that International/Anaconda “managed, directed, or conducted operations” at the Walker
    Mine that “occurred in phase three of mining, ore extraction, which activities resulted, at
    least in part, in the toxic discharge at issue in the [cleanup order].” ARCO then observes
    that all of the evidence relied upon by the trial court in support of that finding involves
    what ARCO’s experts have labeled exploration and development, not ore extraction.
    Finally, ARCO argues there is no evidence in the record that agents of
    International/Anaconda told Walker Mining Company managers how to extract the ore
    once their “development” activities exposed that ore for extraction. From these points,
    ARCO concludes it cannot be held directly liable for the pollution.
    This line of argument rests, however, on a faulty premise, that ore extraction, as
    defined by ARCO’s experts, is the first phase of mining activity that can be considered
    “specifically related to” (Bestfoods, supra, 524 U.S. at p. 66) the pollution at issue in this
    case, i.e., acid mine drainage. Acid mine drainage is “acidic water that is created when
    sulfide minerals are exposed to air and water, producing sulfuric acid,” which then drains
    from the mine into surface waters or seeps into the groundwater. Thus, it is not the
    extraction of ore that causes acid mine drainage, but rather the exposure of mineralized
    rock to air and water. Indeed, the extracted ore that is conveyed to the surface and
    carried away to be refined is necessarily no longer in the mine and cannot result in acid
    mine drainage. It is the exposed mineralized rock that is left behind that causes this
    pollution. We must therefore conclude that any activity that exposes such mineralized
    rock to air and water is specifically related to the pollution at issue in this case. This
    includes the “development” activities directed by International/Anaconda in this case.
    23
    In reaching this conclusion, we accept expert Lombardi’s testimony that the
    “country rock” surrounding the ore and mineralized vein “has minimal sulfides” and
    therefore “doesn’t weather to produce acid mine drainage.” Thus, if the evidence was
    such that agents of International/Anaconda directed the Walker Mining Company to cut
    the various drifts, crosscuts, winzes, et cetera, in the country rock, close to the
    mineralized vein, but without exposing ore or mineralized rock within the vein, we might
    well agree with ARCO’s position. But the very point of this “development” work was to
    expose the ore for extraction. A few examples from the correspondence in this case will
    make this clear. In his November 1924 letter to Wraith, Sales referred to this country
    rock as “waste” and complained that “drifts run in waste . . . should be in ore, or at least
    should be in the vein . . . .” (Italics added.) Thereafter, in August 1925, Lyon approved
    Tunnell’s proposed “development work” with the caveat that “the work should all be
    done in the vein.” (Italics added.) The following month, Lyon authorized Tunnell to
    “drift north and south on the ore disclosed by crosscut 647 S.” (Italics added.)
    Simply put, the entire point of the “development” work directed by agents of
    International/Anaconda was to expose ore for extraction. These same agents made the
    decision to abandon the mine once extracting that ore was no longer profitable, and
    further directed removal of the pumps that had previously kept water out of the mine.
    Acid mine drainage resulted.
    For the foregoing reasons, we conclude the evidence is sufficient to support direct
    liability under Bestfoods.
    II
    Expert Testimony
    ARCO also claims the Regional Board abused its discretion by failing to exclude
    certain expert testimony from Dr. Quivik under Sargon, supra, 
    55 Cal.4th 747
    , and
    therefore these improperly admitted opinions “cannot support the trial court’s liability
    finding.” Not so.
    24
    A.
    Additional Background
    Before the Regional Board, ARCO moved to exclude the following opinion
    testimony of Dr. Quivik: (1) “Anaconda . . . developed a tightly-managed corporate
    structure that allowed top managers of the parent corporation to direct the operations of
    several of its several subsidiaries and far-flung operations,” including the Walker Mining
    Company; (2) “Although the Walker Mining Company had its own board of directors,
    corporate officers, and local managers, management of the Walker Mine was fully
    integrated into the Anaconda . . . enterprise and its management system, so that
    [Anaconda’s] top managers in charge of geology, mining, and metallurgy directed
    activities at those area [sic] at the Walker Mine”; and (3) “[Anaconda] and its subsidiary
    International managed the Walker mine concurrently with the Walker Mining Company
    from 1918 to 1941.” ARCO argued these opinions should be excluded under Sargon
    because they are speculative and rely on leaps of logic. ARCO also challenged testimony
    from Dr. Quivik about “other cases,” including analogies Dr. Quivik drew between this
    case and “the Newmont Mining case,” because unrelated cases “are completely
    irrelevant” to whether International/Anaconda directed operations at the Walker Mine. 4
    The Regional Board’s legal counsel recommended denying the motion, explaining
    that Dr. Quivik’s opinion testimony was “based on hundreds of individual documents in
    4       ARCO’s position at the hearing was that it could not be held liable for the
    pollution at the Walker Mine unless its predecessors, International/Anaconda, managed
    or directed operations at the Walker Mine specifically related to waste disposal. With
    this as the focus, ARCO argued at the hearing that Dr. Quivik’s testimony concerning
    “the control of waste” and “waste disposal activities” at the Walker Mine was “pure
    speculation” and assumed International/Anaconda controlled waste disposal “based on
    activities [involving] other spheres of mining.” However, as we have explained, parental
    direction of activities in these other spheres of mining can support liability under
    Bestfoods as long as they are sufficiently related to the pollution at issue. In any event,
    these arguments are not renewed on appeal and shall be mentioned no further.
    25
    the record that were generated either by Anaconda’s employees or Walker’s employees”
    and was “also based in part on published [treatises] on the mining industry that were
    published contemporaneously with the activities in this case.” Counsel also pointed out
    that “use of the historical method” employed by Dr. Quivik “has been applied in other
    federal environmental litigation lawsuits involving the very type of parent subsidiary
    relationships in the mining industry.”
    The Regional Board agreed with counsel’s analysis and denied the motion, adding,
    “in addition to that, we have a very considerable body of evidence so to speak of -- I
    don’t know how many letters are in this record of correspondence back and forth, which
    speaks to itself, even without Dr. Quivik’s testimony.”
    ARCO renewed its challenge to Dr. Quivik’s testimony before the trial court, both
    in its opening brief in support of its petition for writ of mandate and in its opening brief
    following our remand of the matter. The trial court rejected ARCO’s renewed argument
    that Dr. Quivik’s testimony should have been excluded because it “ ‘relied on unrelated
    cases and was speculative,’ ” explaining: “The Court has reviewed Dr. Quivik’s report
    and testimony and finds the [Regional] Board did not err in denying the motion to
    exclude Dr. Quivik’s opinion.”
    B.
    Analysis
    As a preliminary matter, we note that this contention is made by ARCO under a
    subheading of its first main argument that the trial court improperly applied Bestfoods,
    resulting in a liability finding that is unsupported by substantial evidence. However, even
    if we were to agree that the challenged opinion testimony should have been excluded, this
    would not mean the trial court’s ultimate finding is unsupported by substantial evidence.
    For reasons already explained, even without this challenged opinion testimony, the
    evidence was sufficient to support the trial court’s finding of liability under Bestfoods.
    And while our conclusion in that regard was based in part on Dr. Quivik’s testimony that
    26
    Lyon, Sales, and Weed had no official role at the Walker Mining Company, that portion
    of Dr. Quivik’s testimony was not objected to by ARCO, either before the Regional
    Board or before the trial court. Thus, even if that portion of Dr. Quivik’s testimony was
    inadmissible, the general rule is that “inadmissible evidence . . . admitted without
    objection, is sufficient to sustain a judgment.” (Greenfield v. Insurance Inc. (1971) 
    19 Cal.App.3d 803
    , 811; Prentice v. Miller (1890) 
    82 Cal. 570
    , 572-573.)
    We therefore address this contention separately, solely as a claim of evidentiary
    error. We may reverse only if we conclude there was an abuse of discretion in admitting
    the challenged evidence and a corresponding reasonable probability of a more favorable
    outcome had the evidence not been considered by the trier of fact. (Twenty-Nine Palms
    Enterprises Corp. v. Bardos (2012) 
    210 Cal.App.4th 1435
    , 1447, 1449.) We conclude
    there was no abuse of discretion.
    As ARCO accurately observes, our Supreme Court has held “that the trial court
    has the duty to act as a ‘gatekeeper’ to exclude speculative expert testimony.” (Sargon,
    supra, 55 Cal.4th at p. 753.) This gatekeeping duty arises out of Evidence Code sections
    801 and 802, which require the trial court “to exclude expert opinion testimony that is
    (1) based on matter of a type on which an expert may not reasonably rely, (2) based on
    reasons unsupported by the material on which the expert relies, or (3) speculative.”
    (Sargon, at pp. 771-772.) However, the court also cautioned that trial courts must be
    careful not to “choos[e] between competing expert opinions” under the guise of
    excluding unreliable or speculative opinion testimony: “The trial court’s preliminary
    determination whether the expert opinion is founded on sound logic is not a decision on
    its persuasiveness. The court must not weigh an opinion’s probative value or substitute
    its own opinion for the expert’s opinion. Rather, the court must simply determine
    whether the matter relied on can provide a reasonable basis for the opinion or whether
    that opinion is based on a leap of logic or conjecture. The court does not resolve
    scientific controversies. Rather, it conducts a ‘circumscribed inquiry’ to ‘determine
    27
    whether, as a matter of logic, the studies and other information cited by experts
    adequately support the conclusion that the expert’s general theory or technique is valid.’
    [Citation.] The goal of trial court gatekeeping is simply to exclude ‘clearly invalid and
    unreliable’ expert opinion. [Citation.] In short, the gatekeeper’s role ‘is to make certain
    that an expert, whether basing testimony upon professional studies or personal
    experience, employs in the courtroom the same level of intellectual rigor that
    characterizes the practice of an expert in the relevant field.’ [Citation.]” (Id. at p. 772.)
    Here, Dr. Quivik, an industrial historian, relied on hundreds of primary historical
    sources, including correspondence from the relevant actors at Anaconda, International,
    and the Walker Mining Company, as well as reputable secondary sources, including the
    Engineering and Mining Journal, the principal trade journal for the mining industry in the
    United States, in order to develop general histories of these companies from the 1910’s
    through the 1940’s and also to form opinions regarding the relationship between them,
    specifically related to operation of the Walker Mine. ARCO has not persuaded this court
    that these sources cannot provide a reasonable basis for the challenged opinions in this
    case.
    Nor are we persuaded that the challenged opinions are based on a leap of logic.
    The testimony in this case is not like the speculative testimony at issue in Sargon. There,
    on behalf of a small dental implant company suing a university for breach of contract, an
    expert sought to testify that the company would have become a worldwide leader in the
    dental implant industry but for the university’s breach of contract, justifying damages for
    lost profits in excess of $200 million. (Sargon, supra, 55 Cal.4th at p. 753.) The trial
    court excluded the evidence as speculative. Our Supreme Court agreed, explaining: “An
    expert might be able to make reasonably certain lost profit estimates based on a
    company’s share of the overall market. But [the expert] did not base his lost profit
    estimates on a market share [the company] had ever actually achieved. Instead, he
    opined that Sargon’s market share would have increased spectacularly over time to levels
    28
    far above anything it had ever reached. He based his lost profit estimates on that
    hypothetical increased share.” (Id. at p. 776.) And while the expert justified his
    assumption of increased market share based on the “ ‘ “innovativeness” ’ ” of the
    company, the court adopted the trial court’s reasoning that “ ‘there is no evidentiary basis
    that equates the degree of innovativeness with the degree of difference in market share,’ ”
    and therefore, the expert’s opinion in this regard “ ‘has no rational basis.’ ” (Id. at
    p. 778.) Thus, while an expert may properly estimate lost profits based on market share,
    the leap in logic was that a high degree of innovativeness equates with a dramatically
    increased market share.
    Here, Dr. Quivik did not engage in a similar leap in logic in concluding that
    Anaconda’s corporate structure allowed its top managers to direct the operations of the
    Walker Mining Company, or that Anaconda’s top managers in charge of geology,
    mining, and metallurgy directed activities in those areas at the Walker Mine, or that
    Anaconda and its subsidiary, International, managed the Walker Mine concurrently with
    the Walker Mining Company during the relevant time period. These opinions were
    directly based on Dr. Quivik’s review of the primary and secondary sources indicated
    above. It was for the trier of fact to determine whether to credit them or not, but we
    cannot conclude it was an abuse of discretion to allow the testimony.
    Nevertheless, ARCO argues Dr. Quivik’s “reliance upon an unrelated contract
    between two unrelated companies‒Newmont Mining Corporation and Dawn Mining
    Company‒renders inadmissible his opinion about the relationship between [the Walker
    Mining Company] and Anaconda.” Not so. Dr. Quivik noted that one of the primary
    sources he examined, a newspaper article from 1920, indicated there was a management
    contract between Anaconda and the Walker Mining Company under which Anaconda
    operated the Walker Mine during that time period. Dr. Quivik also noted that he had not
    seen the contract mentioned in the article, but indicated he had seen “such contracts in
    other episodes of U.S. mining history, most notably in the relationship between Newmont
    29
    Mining Corporation and its subsidiary, Dawn Mining Company.” Dr. Quivik then moved
    on to other contemporaneous evidence of “Anaconda’s management role” at the Walker
    Mine, occasionally comparing this role to Newmont’s role in managing its subsidiary’s
    mining operation. Dr. Quivik also discussed Newmont, as well as other mining
    companies, more generally in a section of his report titled “The Historical Context for
    Understanding Twentieth-Century Management of Large-Scale Mining Enterprises.”
    Thus, Dr. Quivik did not speculatively assume, based on an unrelated contract between
    Newmont and Dawn, that Anaconda managed the Walker Mine. He instead came to this
    conclusion based on the various primary and secondary sources noted above and
    indicated this was consistent with what other mining companies were doing at the time.
    Reference to the Newmont-Dawn contract does not render Dr. Quivik’s testimony
    speculative. 5
    Finally, ARCO claims that Dr. Quivik, “as a historian and not a geologist with
    first-hand mining experience, . . . lacks the necessary qualifications to offer opinions
    about the particulars of mine management.” This claim is forfeited for failure to support
    it with reasoned argument and citation to relevant authority. (See Benach v. County of
    Los Angeles (2007) 
    149 Cal.App.4th 836
    , 852; Badie v. Bank of America (1998) 
    67 Cal.App.4th 779
    , 784-785.) The entirety of the “argument” is the conclusory statement
    that Dr. Quivik’s lack of firsthand mining experience makes his opinion regarding the
    relationship between International/Anaconda and the Walker Mining Company
    “necessarily speculative and inadmissible under Sargon.”
    5      ARCO also asserts that Dr. Quivik’s “reliance” on the Newmont-Dawn contract
    amounts to an admission that “he did not follow his own methodology,” which “requires
    that unrelated material not be relied upon,” and therefore, “his opinion [should have
    been] excluded as unreliable speculation.” However, as we have explained, Dr. Quivik
    did not rely on this unrelated contract so much as reference it as part of the historical
    context of mining operations.
    30
    There was no abuse of discretion in allowing the admission of the challenged
    aspects of Dr. Quivik’s expert testimony.
    III
    Due Process Claim
    ARCO further asserts the Regional Board’s actual financial bias in this matter
    requires invalidation of the cleanup order for violation of due process. We are not
    persuaded.
    Our Supreme Court set forth the applicable due process principles in Today’s
    Fresh Start, Inc. v. Los Angeles County Office of Education (2013) 
    57 Cal.4th 197
    (Today’s Fresh Start): “Both the federal and state Constitutions compel the government
    to afford persons due process before depriving them of any property interest. [Citations.]
    In light of the virtually identical language of the federal and state guarantees, we have
    looked to the United States Supreme Court’s precedents for guidance in interpreting the
    contours of our own due process clause and have treated the state clause’s prescriptions
    as substantially overlapping those of the federal Constitution. [Citation.] [¶] ‘The
    essence of due process is the requirement that “a person in jeopardy of serious loss [be
    given] notice of the case against him and opportunity to meet it.” ’ [Citations.] The
    opportunity to be heard must be afforded ‘at a meaningful time and in a meaningful
    manner.’ [Citations.] To ensure that the opportunity is meaningful, the United States
    Supreme Court and this court have identified some aspects of due process as irreducible
    minimums. For example, whenever ‘due process requires a hearing, the adjudicator must
    be impartial.’ [Citations.]” (Id. at p. 212.)
    “The requirements of due process extend to administrative adjudications.”
    (Today’s Fresh Start, supra, 57 Cal.4th at p. 214.) “ ‘When, as here, an administrative
    agency conducts adjudicative proceedings, the constitutional guarantee of due process of
    law requires a fair tribunal. [Citation.] A fair tribunal is one in which the judge or other
    decision maker is free of bias for or against a party.’ [Citation.] ‘Of all the types of bias
    31
    that can affect adjudication, pecuniary interest has long received the most unequivocal
    condemnation and the least forgiving scrutiny.’ [Citation.] The state and federal
    Constitutions forbid the deprivation of property by a judge with a ‘ “direct, personal,
    substantial, pecuniary interest in reaching a conclusion against” ’ a party. [Citations.]”
    (Id. at p. 215.)
    For example, in Ward v. Village of Monroeville (1972) 
    409 U.S. 57
    , a mayor,
    authorized by state statute to sit as judge in cases of certain traffic offenses, convicted the
    defendant of two such offenses and fined him a total of $100. (Id. at p. 57.) Revenue
    from the “ ‘mayor’s court’ ” was conceded to provide “ ‘a substantial portion of the
    municipality’s funds.’ ” (Id. at p. 59.) As the United States Supreme Court explained,
    whether this violated the defendant’s right to due process depended on “whether the
    mayor’s situation is one ‘which would offer a possible temptation to the average [person]
    as a judge to forget the burden of proof required to convict the defendant, or which might
    lead him [or her] not to hold the balance nice, clear and true between the state and the
    accused . . . .’ ” (Id. at p. 60.) The court held that possible temptation plainly existed
    because “the mayor’s executive responsibilities for village finances may make him
    partisan to maintain the high level of contribution from the mayor’s court.” (Ibid.; see
    also Tumey v. Ohio (1927) 
    273 U.S. 510
    , 521, 532 [mayor not impartial adjudicator of
    violations of prohibition laws where fines imposed for such violations made up
    substantial portion of the village treasury].)
    Similarly, in Haas v. County of San Bernardino (2002) 
    27 Cal.4th 1017
    , our
    Supreme Court held that the practice, adopted by some county governments, of selecting
    and paying temporary administrative hearing officers on an ad hoc basis violated due
    process because it created the risk that decisions favorable to the government would be
    rewarded with future work. (Id. at pp. 1020-1021.) The court explained that while “due
    process allows more flexibility in administrative process than judicial process, even in the
    matter of selecting hearing officers[,] . . . the rule disqualifying adjudicators with
    32
    pecuniary interests applies with full force.” (Id. at p. 1027.) Thus, whereas an assertion
    of bias based on “the combination of investigative and adjudicative functions in
    administrative proceedings,” must “ ‘overcome a presumption of honesty and integrity in
    those serving as adjudicators[,]’ . . . the adjudicator’s financial interest in the outcome
    presents a ‘situation[ ] . . . in which experience teaches that the probability of actual bias
    on the part of the judge or decisionmaker is too high to be constitutionally tolerable.’
    [Citation.]” (Ibid.)
    An example of an administrative board with a disqualifying financial bias can be
    found in Esso Standard Oil Co. v. López-Freytes (1st Cir. 2008) 
    522 F.3d 136
    . There,
    Puerto Rico’s Environmental Quality Board (EQB) issued a show cause order proposing
    a $76 million fine that would go “directly into an account administered by the EQB.” (Id.
    at p. 145.) Relying on Ward and Tumey, the court held that a disqualifying financial bias
    arose from “the potential financial benefit to the EQB’s budget as a result of an imposed
    fine,” and explained: “This is not a situation in which the EQB Governing Board is so
    removed from the financial policy of the Special Account that such a presumption of bias
    is inapplicable. [Citation.] Rather, this is a case in which the EQB has complete
    discretion over the usage of those funds which are supplied, at least in part, by fines
    which it imposes. In this particular case, the possibility of temptation is undeniable and
    evident in the fact that the size of the proposed fine in this case is so unprecedented and
    extraordinarily large. The $76 million proposed fine—a sum twice the EQB’s annual
    operating budget and 5,000 times greater than the largest fine ever imposed by the
    EQB—only intensifies the appearance of bias infecting the proceedings.” (Id. at pp. 146-
    147.)
    In contrast, in Lent v. California Coastal Com. (2021) 
    62 Cal.App.5th 812
     (Lent),
    our colleagues at the Second Appellate District held the appellants, oceanfront
    landowners, did not carry their burden of demonstrating the California Coastal
    Commission (Coastal Commission) had such a disqualifying financial bias when it
    33
    imposed a penalty of more than $4 million for obstructing public access to the beach. (Id.
    at p. 853.) The court first noted that revenue generated from such a penalty was not
    collected by the Coastal Commission and was deposited in a Coastal Conservancy Fund
    account. (Id. at p. 851.) However, the California Coastal Act of 1976 (Pub. Resources
    Code, § 30000 et seq.) requires the coastal conservancy to expend funds for carrying out
    the provisions of that act, and the Coastal Commission has primary responsibility for
    implementing the act. (Lent, at p. 851.) Thus, the statutory scheme allows the Coastal
    Commission, “with both executive and adjudicative functions,” to “raise revenue by
    imposing penalties in adjudicative proceedings.” (Ibid.) That alone was not enough to
    violate due process, however.
    After discussing the relevant caselaw, including Ward and Tumey, as well as
    Alpha Epsilon Phi Tau Chapter Housing Assn. v. City of Berkeley (9th Cir. 1997) 
    114 F.3d 840
    , in which the Ninth Circuit “held a city’s rent stabilization board that decided
    appeals over whether units were subject to the city’s rent control ordinance was an
    impartial adjudicator, even though the board could impose fees and penalties to raise
    revenue,” (Lent, supra, 62 Cal.App.5th at p. 852) the court explained: “The Coastal Act
    places some check on the Commission’s ability to use revenue derived from penalties . . .
    by requiring that the Legislature appropriate and the Conservancy expend the funds.
    [Citations.] More importantly, the [appellants] submitted no evidence in the trial court of
    how much money the Legislature generally appropriates or the Conservancy spends from
    the Violation Remediation Account to carry out the provisions of the Coastal Act. Nor
    did the [appellants] submit evidence of the Commission’s annual budget or of how much
    of its budget (if any) the Commission generally receives from expenditures from the
    Violation Remediation Account. The Coastal Act may give the commissioners at least
    some incentive to impose substantial fines . . . , just as the budgetary system in Alpha
    Epsilon gave the board some incentive to recover registration fees and impose late
    payment penalties on landlords. [Citation.] But absent some additional evidence
    34
    showing how much the commissioners rely on the penalties to carry out their executive
    duty to implement the Coastal Act, we cannot determine whether the commissioners’
    motives are strong enough to reasonably warrant a ‘fear of partisan influence’ on the
    Commission’s judgment or to cause the commissioners ‘ “not to hold the balance nice,
    clear, and true between the state and the accused.” ’ [Citations.]” (Id. at p. 853.)
    Here, the asserted financial bias does not stem from the Regional Board imposing
    fines or penalties to fund its own executive functions. Indeed, a cleanup order issued
    under section 13304 does not impose a fine or penalty at all. Instead, as relevant here, it
    orders a “person who has . . . caused or permitted . . . any waste to be discharged or
    deposited . . . into the waters of the state,” creating “a condition of pollution or nuisance,”
    to “clean up the waste or abate the effects of the waste . . . .” (§ 13304, subd. (a).)
    Nevertheless, ARCO argues the abatement activities undertaken by the Regional Board at
    the Walker Mine, before issuing the cleanup order in this case, gave it a strong financial
    incentive “to shed liability” for its own pollution-causing activities by ordering ARCO to
    clean up the pollution. 6
    ARCO argues the Regional Board is partially responsible for the pollution for two
    reasons: (1) the Regional Board “assumed control of the mine decades ago and installed
    an adit plug that has exacerbated the contamination and is causing the pollution to impact
    groundwater and surface water”; and (2) the Regional Board “assumed additional liability
    6       ARCO misleadingly states that the trial court “correctly found that the [Regional]
    Board is liable for its portion of contamination at the [Walker Mine].” The trial court
    made no such finding. After finding eccentric control, and noting in a footnote that
    “ARCO raises the issue of bias and adjudication by an improper tribunal,” the trial court
    noted “prospectively the [Regional] Board appears to be an improper adjudicator of
    apportionment because the [Regional] Board would not stand in a neutral position
    sufficient to provide a fair and impartial hearing” on the issue of apportioning cleanup
    costs due to its “possible financial exposure.” The trial court did not conclude any actual
    exposure existed. In any event, as ARCO correctly observes, “[t]his court’s review on
    this issue is de novo; therefore, no deference is owed to the trial court’s [determination].”
    35
    when settling with and agreeing to hold harmless other parties,” specifically, intervening
    owners of the Walker Mine. We disagree.
    The Regional Board authorized remediation work at the Walker Mine in 1986
    pursuant to section 13305, which “provides a mechanism under which a [regional water
    board] may abate water pollution emanating from nonoperating industrial or business
    locations.” (People ex rel. Cal. Regional Wat. Quality Control Bd. v. Barry (1987) 
    194 Cal.App.3d 158
    , 161.) Since at least 1991, the State Water Resources Control Board
    (State Water Board) has funded the Regional Board’s remediation activities at the Walker
    Mine, including installation and maintenance of the adit plug, from the State Water
    Pollution Cleanup and Abatement Account in the State Water Quality Control Fund.
    (See §§ 13440, 13442.) To be sure, requiring ARCO to clean up the pollution at the
    Walker Mine will benefit this account by stopping expenditures for purposes of
    remediation work at the mine, but this account is administered by the State Water Board,
    not the Regional Board. Thus, unlike Ward, Tumey, Lopez-Freytes, and even Lent, there
    is no evidence the cleanup order benefits any fund or budget over which the Regional
    Board exercises any amount of discretion.
    With respect to the assertion that the Regional Board exacerbated the pollution at
    the Walker Mine by installing the adit plug, and therefore had a financial interest in
    shifting the costs of cleaning up its own pollution, we conclude ARCO has not carried its
    appellate burden of demonstrating this to be the case. Our review of the record reveals
    that the adit plug “successfully eliminated most or all of the direct discharge of [acid
    mine drainage] and metals through the 700 level adit” and “dramatically reduced” the
    levels of copper in nearby waterways. And while ARCO’s expert, Lombardi, testified at
    the hearing that the adit plug increased acid mine drainage into groundwater, which
    ultimately reached the surface streams, he also noted in his report that this is subject to
    dispute, pointing out that an independent study commissioned by the Regional Board,
    included as an addendum to the final feasibility study and design report for sealing the
    36
    mine, “suggests that the acid drainage that accumulates behind the plug would migrate
    out into the country rock where it would be neutralized and the copper precipitate out of
    solution prior to discharging to surface water.” Indeed, about 60 percent of the inflow to
    the mine had already been discharging into bedrock since the mine closed in 1941, but
    there was “no evidence of a stream of copper-laden water egressing from the
    groundwater system to the surface water system.” Moreover, while Lombardi disagreed
    with this assessment, his own report indicated “insufficient data have been collected for
    proper evaluation” of the issue. We conclude this showing is insufficient to demonstrate
    a disqualifying financial bias on the part of the Regional Board.
    Finally, while the Regional Board also entered into two settlement agreements
    with Walker Mine property owners, in neither agreement does the Regional Board
    assume responsibility for any pollution caused by these settling property owners.
    ARCO’s assertion of financial bias based on these agreements must therefore also fail.
    ARCO has not persuaded this court that its due process rights were violated due to
    financial bias on the part of the Regional Board. 7
    7       This conclusion makes it unnecessary to address ARCO’s related argument that
    the Regional Board’s financial liability for the pollution at the Walker Mine limits its
    remedy against ARCO to an action for contribution under section 13350. However, we
    do note the subdivision ARCO relies on for this proposition applies to “[a] person who
    incurs any liability established under this section” (§ 13350, subd. (i)) and section 13350
    authorizes courts, regional water boards, and the State Water Board to impose monetary
    liability for various activities, such as violating a cleanup order. (§ 13350, subds. (a), (b),
    (d), (e).) Where such liability is incurred, subdivision (i) allows the person who incurred
    it to seek contribution “from a third party, in an action in the superior court and upon
    proof that the discharge was caused in whole or in part by an act or omission of the third
    party, to the extent that the discharge is caused by the act or omission of the third party,
    in accordance with the principles of comparative fault.” (§ 13350, subd. (i).) No such
    liability has been incurred in this case. Section 13350 is therefore inapposite.
    37
    IV
    Joint and Several Liability
    Finally, we also reject ARCO’s contention that the cleanup order erroneously
    imposed joint and several liability. ARCO argues section 13304, subdivision (a) “does
    not authorize making one party jointly and severally liable for all liabilities of all
    potentially responsible parties . . . .” The State Water Board has consistently disagreed
    with this assertion, explaining: “When releases from two or more different sources
    commingle, the State Water Board generally considers all responsible parties of the
    separate releases as jointly and severally liable for the commingled release. [Citation.]
    This is true where the releases originate from different properties or where the releases
    originate from the same property but at different times. All parties that contributed to the
    commingled release are generally considered liable until the entire commingled release
    requires no further action.” (Matter of the Petition of James Salvatore (State Water
    Resources Control Bd., Nov. 5, 2013, Order No. WQ 2013-0109) pp. 10-11 [2013
    Cal.Env Lexis 148]; see also Matter of the Petition of Union Oil Company of California
    (State Water Resources Control Bd., Apr. 19, 1990, Order No. WQ 90-2) p. 8 [1990
    Cal.Env Lexis 23].) While “we are not bound by the legal determinations made by the
    state or regional agencies[,] . . . we must give appropriate consideration to an
    administrative agency’s expertise underlying its interpretation of an applicable statute.”
    (Building Industry, supra, 124 Cal.App.4th at p. 879, fn. omitted.)
    We agree with the State Water Board’s assessment of section 13304. As stated
    previously, subdivision (a) of this section provides in relevant part: “A person who has
    . . . caused or permitted . . . any waste to be discharged or deposited . . . into the waters of
    the state and creates . . . a condition of pollution or nuisance, shall, upon order of the
    regional board, clean up the waste or abate the effects of the waste . . . .” (§ 13304, subd.
    (a).) Thus, two elements are required: (1) causing or permitting the discharge; and (2)
    creating a condition of pollution or nuisance. (San Diego Gas & Electric Co. v. San
    38
    Diego Regional Water Quality Control Bd. (2019) 
    36 Cal.App.5th 427
    , 431 (SDG&E).)
    We have already held ARCO’s predecessors, International/Anaconda, exercised eccentric
    control over the Walker Mine causing the discharge of acid mine drainage. The second
    element, pollution or nuisance creation, does “not require proof that the defendant’s act
    was a ‘substantial factor’ or ‘but for’ cause of the resulting [pollution or] nuisance.” (Id.
    at pp. 438-439.) Instead, all that is required is that the pollution or nuisance was “the
    aggregate result” of all waste discharges. (Hillman v. Newington (1880) 
    57 Cal. 56
    , 59;
    People v. Gold Run Ditch & Mining Co. (1884) 
    66 Cal. 138
    , 148-149; SDG&E, 
    supra,
     36
    Cal.App.5th at pp. 437-439.)
    Where, as here, both elements are satisfied, the entity that caused or permitted the
    discharge may be ordered to clean up the waste or abate its effects. Nowhere in the
    statutory language does section 13304 say the polluting entity must clean up or abate only
    its proportionate contribution to that waste. To the extent ARCO cleans up more than its
    proportionate share of the acid mine drainage at the Walker Mine, it can seek
    contribution from other parties it believes also contributed to the pollution. (See, e.g.,
    Standun, Inc. v. Fireman’s Fund Ins. Co. (1998) 
    62 Cal.App.4th 882
    , 886 [businesses
    that paid cleanup costs imposed by the U.S. Environmental Protection Agency sued
    another business for contribution of its proportionate share of those costs].)
    All that is required for this court to affirm the trial court’s judgment upholding the
    Regional Board’s cleanup order is for there to be substantial evidence of both elements of
    section 13304, subdivision (a). (See Barclay Hollander, supra, 38 Cal.App.5th at p. 498;
    SDG&E, 
    supra,
     36 Cal.App.5th at p. 431.) That standard is met.
    The Regional Board was not required to apportion responsibility for the pollution
    in the cleanup order.
    39
    DISPOSITION
    The judgment is affirmed. The stay of the cleanup order issued by this court on
    December 24, 2020, is hereby vacated. The Regional Board is entitled to costs on appeal.
    (Cal. Rules of Court, rule 8.278(a)(1), (2).)
    /s/
    HOCH, J.
    We concur:
    /s/
    DUARTE, Acting P. J.
    /s/
    EARL, J.
    40