Duran v. U.S. Bank Nat'l. Ass'n. ( 2018 )


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  • Filed 1/17/18
    CERTIFIED FOR PUBLICATION
    IN THE COURT OF APPEAL OF THE STATE OF CALIFORNIA
    FIRST APPELLATE DISTRICT
    DIVISION ONE
    SAMUEL DURAN et al.,
    Plaintiffs and Appellants,
    A148817
    v.
    U.S. BANK NATIONAL ASSOCIATION,                     (Alameda County
    Super. Ct. No. 2001-035537)
    Defendant and Respondent.
    In our second encounter with this class action case, plaintiffs Samuel Duran and
    Matt Fitzsimmons appeal from the trial court’s order denying class certification. This
    case is a wage and hour class action challenging whether defendant U.S. Bank National
    Association (Bank) had properly classified its business banking officers (BBOs) as
    exempt employees under the outside salesperson exemption. This exemption applies to
    employees who spend more than 50 percent of their workday engaged in sales activities
    outside their employer’s place of business. The trial court concluded plaintiffs failed to
    demonstrate that the case is manageable as a class action. We affirm.
    FACTUAL BACKGROUND AND PROCEDURAL HISTORY
    I.      Background
    The factual background behind plaintiffs’ claims and the procedural history of this
    case from its inception are well known to the parties and this court, and we will not repeat
    it here. In brief, the case centers on plaintiffs’ allegations that they were misclassified as
    outside salespersons when they allegedly actually spent the majority of their working
    hours inside Bank offices.1 Like the court below, we incorporate by reference pages 13
    through 24 of the Supreme Court’s opinion in 
    Duran, supra
    , 
    59 Cal. 4th 1
    .) That decision
    affirmed our opinion reversing the judgment entered in favor of plaintiffs after a bench
    trial, leaving open that the trial court could “entertain a new class certification motion.”
    (Duran, at p. 50.) That new motion is the subject of the present appeal.
    On July 7, 2014, the remittitur from Duran was filed and the case was reassigned
    to a new judicial officer on September 8, 2014, following the Bank’s challenge to the
    original trial judge.
    II.    Motions Regarding Certification
    On December 18, 2014, the Bank filed a motion to deny class certification.
    On January 21, 2015, the trial court denied plaintiffs’ request to reopen discovery,
    finding that the prior discovery was “very extensive.”
    Plaintiffs retained survey expert Jon A. Krosnick in connection with their
    opposition to the Bank’s motion. On February 1, 2015, Krosnick sent an “ ‘advance
    letter’ ” to putative class members, alerting them to an impending survey and the fact that
    they might be contacted. The letter enclosed $2 as a “thank you” and promised an
    additional $25 to $35 for answering a 20-minute phone survey that would be “completely
    confidential.”
    On February 13, 2015, Ted Biggs, a senior vice president of the Bank, sent a letter
    to putative class members informing them of the Bank’s belief that Krosnick’s letter had
    been sent in connection with the pending lawsuit. Among other things, Biggs disputed a
    statement in Krosnick’s letter promising respondents that their identities would be kept
    confidential.
    1
    An outside salesperson is one who “customarily and regularly works more than
    half the working time away from the employer’s place of business” on sales duties. (See
    Industrial Welfare Com., Wage Order No. 4-2001, subd. (2)(m).) Here, there is no
    dispute that BBOs were primarily engaged in “sales.” (Duran v. U.S. Bank National
    Assn. (2014) 
    59 Cal. 4th 1
    , 26 (Duran).)
    2
    On February 27, 2015, the trial court granted, in part, plaintiffs’ ex parte
    application seeking, among other things, the authority to send a corrective mailing.2 The
    court denied the Bank’s corresponding ex parte application seeking to halt the survey and
    to bar further “ ‘unapproved’ ” communications with putative class members. The court
    found plaintiffs had a right to conduct the survey in order to support their opposition to
    the Bank’s motion. At the same time, the court observed it was unclear “how a survey of
    putative class members in this unique context could help resolve the manageability
    issues” identified by the Supreme Court in Duran.
    On April 30, 2015, plaintiffs filed an opposition to the Bank’s motion to deny
    certification, characterizing their opposition as a cross-motion for class certification.3 In
    support of their motion, plaintiffs included, among other things, an April 2015 survey
    report prepared by Krosnick (2015 Survey). In his report, he indicated his task had been
    “to conduct a survey of members of the Duran class with which to generate a menu of
    margins of errors for various possible numbers of witnesses who could testify at trial and
    answer questions to reveal the average number of hours they worked per week, the
    proportion of their work hours that were spent performing sales-related activities, and the
    proportion of their work hours that were spent performing outside sales-related
    activities.” The 2015 Survey is described in more detail below.
    On June 5, 2015, the trial court granted, in part, a motion to compel filed by the
    Bank, ordering plaintiffs to produce the identities of the 2015 Survey respondents and
    their survey responses. The court also ordered plaintiffs to produce the identities of those
    respondents to an earlier Krosnick survey (2008 Survey) who had also responded to the
    2
    Apart from allowing plaintiffs to depose the Bank’s senior vice president “in
    order to get to the bottom of what happened,” the trial court denied plaintiffs’ request to
    reopen discovery.
    3
    The parties submitted extensive evidence to the trial court in connection with the
    class certification issue, much of which the court found to be “incredibly redundant.”
    3
    2015 Survey, together with the 2008 Survey responses of those respondents.4 In its
    order, the court observed plaintiffs had failed to provide a “separate detailed trial plan,”
    even though this was “one of the most important take-aways from the Supreme Court’s
    decision in this case.”
    On August 21, 2015, plaintiffs submitted an expanded trial plan. Plaintiffs
    proposed a bifurcated trial, with the liability phase focusing on “ ‘the ultimate question’ ”
    of whether the Bank had “realistic” expectations that BBOs could perform their job
    duties and meet the production goals of their position while spending more than half of
    their working time away from the office. As statistical evidence, they proposed using
    representative testimony with sample sizes ranging from 15 to 50 BBOs, having
    associated respective margins of error ranging from 11 percent to 5.53 percent. This
    liability phase would be followed by a restitution phase to determine the amount of
    money owed to the class, “[b]ased on the court’s findings of the average hours worked
    per week by the randomly chosen BBOs who testify at trial.” Plaintiffs proposed
    allowing the Bank to litigate its affirmative defense by calling BBOs outside the random
    sample, subject to the trial court’s discretion to cut off the Banks’ presentation of
    evidence under Evidence Code section 352.
    On October 2, 2015, the Bank filed its reply brief, expanding the evidentiary
    record to include 66 additional declarations from BBOs who testified that they regularly
    spent the majority of their time outside Bank locations. The Bank also included a
    declaration prepared by its expert, Andrew Hildreth, which criticized the 2015 Survey
    and its methodology. In brief, Hildreth concluded the survey suffered from self-selection
    bias, as well as serious measurement and estimation errors.
    4
    The 2008 Survey was ruled inadmissible during the first trial.
    4
    On November 13, 2015, plaintiffs filed their reply in support of their cross-motion
    for class certification, along with a third Krosnick report that addressed Hildreth’s
    criticisms.
    On March 25, 2016, the trial court, pursuant to Evidence Code section 730,
    appointed an independent expert, Kent D. Van Liere, to advise it on the survey science
    underpinning the parties’ motions.5
    5
    Evidence Code section 730 provides, in part: “When it appears to the court, at
    any time before or during the trial of an action, that expert evidence is or may be required
    by the court or by any party to the action, the court on its own motion or on motion of
    any party may appoint one or more experts to investigate, to render a report as may be
    ordered by the court, and to testify as an expert at the trial of the action relative to the fact
    or matter as to which the expert evidence is or may be required. The court may fix the
    compensation for these services, if any, rendered by any person appointed under this
    section, in addition to any service as a witness, at the amount as seems reasonable to the
    court.” In a footnote in its order, the trial court asked that we give “further guidance on
    the use of [Evidence Code] Section 730 to appoint an expert as a court technical
    consultant,” citing to Diaz-Barba v. Superior Court (2015) 
    236 Cal. App. 4th 1470
    , 1490.
    The use of experts to assist the court as consultants can be beneficial in complex
    cases. We note Federal Rules of Evidence, rule 706 also applies to court-appointed
    expert witnesses. Cases addressing this rule may prove helpful to our trial courts. As
    was observed in Leesona Corp. v. Varta Batteries, Inc. (S.D.N.Y. 1981) 
    522 F. Supp. 1304
    , 1312: “[A] court expert serves not only as a witness on whose opinion the Court
    can rely for assistance, but also as both a second set of ears for the court and a teacher
    who, unaffected by his having been called as a witness by one side or the other, can
    explain the technical significance of the evidence presented. [¶] Naturally a court will
    rely heavily on and give great weight to the testimony of its own expert . . . .
    Nevertheless, although a scientifically difficult patent case such as this is ideally suited to
    the appointment of a court expert pursuant to Rule 706, the appointment of such an expert
    does not remove from the trial court’s shoulders the burden of understanding and
    becoming fully familiar with the technical questions in the case. The court expert serves
    to enhance the trial court’s understanding, but it is the court, and not its expert, that
    decides the case.”
    California courts have acknowledged the value in court-appointed assistance from
    experts, especially in complex cases presenting issues beyond a trial judge’s knowledge.
    (People ex rel. Brown v. Tri-Union Seafoods, LLC (2009) 
    171 Cal. App. 4th 1549
    , 1573–
    1574; Mercury Casualty Co. v. Superior Court (1986) 
    179 Cal. App. 3d 1027
    , 1032.)
    5
    On March 29, 2016, the Bank submitted a second declaration from Hildreth
    addressing new material contained in the third Krosnick report.
    III.    Denial of Class Certification
    On May 19, 2016, the trial court filed its order denying class certification. In its
    order, the court concluded plaintiffs had failed to carry their burden of showing that
    common questions predominated. The court observed, “A primary factor in the Duran
    court’s finding that the class may have been improvidently certified the first time around
    was its conclusion that the trial court had ‘received no evidence establishing uniformity
    in how BBOs spent their time.’ ” The court concluded that, apart from shoring up
    plaintiffs’ trial plan, their statistical evidence “continues to fall short of the kind of
    showing of uniformity that the Duran court found necessary.” In spite of the voluminous
    evidence submitted by both parties, the court found “[t]he only new material of any
    importance lies in the disputes between Krosnick and Hildreth” (italics added). The court
    determined the certification issue based on its resolution of those disputes.
    Relying on Hildreth’s analysis, the trial court concluded that two central flaws in
    the 2015 Survey operated to defeat plaintiffs’ certification efforts: (1) “the issues arising
    from the differences between the responses to the 2008 Survey and the responses to the
    2015 Survey,” and (2) “the related issue of Krosnick’s use of total average hours worked
    per week rather than average overtime hours worked per week.” As to the second point,
    the trial court surmised that Krosnick had failed to understand plaintiffs’ theory of
    liability.
    In setting forth its reasoning, the trial court also indicated it was “initially
    satisfied” with how plaintiffs’ trial plan proposed addressing the Bank’s affirmative
    defenses. However, upon finding the 2015 Survey data to be unreliable “for any
    purpose” (italics added), the court determined plaintiffs could not rely on the survey
    instrument in establishing a prima facie case. Additionally, the court observed that
    representative sampling could not be used to establish an aggregate restitution award
    6
    because the proposed sample sizes were not scientifically supportable for that purpose.
    The court also found it would not be able to adequately manage the Bank’s affirmative
    defense—that at least some class members worked most of their time outside the office—
    because the 2015 Survey failed to eliminate the need for “a host of ‘mini trials.’ ” In
    sum, the court concluded the pertinent factual questions “present severe manageability
    problems.” The court thus denied certification on the grounds that plaintiffs had failed to
    demonstrate common issues would predominate or that individual issues could be
    effectively managed. This appeal followed.
    DISCUSSION
    I.     Standard of Review for Class Certification
    The party seeking class treatment must show (1) an ascertainable and sufficiently
    numerous class, (2) a well-defined community of interest, and (3) substantial benefits
    from certification that render proceeding as a class superior to the alternatives. (Ayala v.
    Antelope Valley Newspapers, Inc. (2014) 
    59 Cal. 4th 522
    , 529–530 (Ayala); Brinker
    Restaurant Corp. v. Superior Court (2012) 
    53 Cal. 4th 1004
    , 1021 (Brinker).) The
    “community of interest” requirement encompasses three factors: predominant common
    questions of law or fact; class representatives with claims or defenses typical of the class;
    and class representatives who adequately represent the class. (Ayala, at p. 530; Brinker,
    at p. 1021.)
    The certification question is a procedural one that does not focus on the merits of
    the case. 
    (Brinker, supra
    , 53 Cal.4th at p. 1023; Sav-On Drug Stores, Inc. v. Superior
    Court (2004) 
    34 Cal. 4th 319
    , 327 (Sav-On).) In evaluating predominance, our Supreme
    Court explained: “[A court] must determine whether the elements necessary to establish
    liability are susceptible of common proof or, if not, whether there are ways to manage
    effectively proof of any elements that may require individualized evidence.” (Brinker, at
    p. 1024; accord, 
    Ayala, supra
    , 59 Cal.4th at p. 533.) “The ‘ultimate question’ the element
    of predominance presents is whether ‘the issues which may be jointly tried, when
    7
    compared with those requiring separate adjudication, are so numerous or substantial that
    the maintenance of a class action would be advantageous to the judicial process and to
    the litigants.’ ” (Brinker, at p. 1021; accord, 
    Duran, supra
    , 59 Cal.4th at p. 28.) In
    addition, the trial court must consider whether individual issues, including those arising
    from affirmative defenses, can be managed fairly and efficiently. (Duran, at pp. 28–29;
    Washington Mutual Bank v. Superior Court (2001) 
    24 Cal. 4th 906
    , 922–923; Martinez v.
    Joe’s Crab Shack Holdings (2014) 
    231 Cal. App. 4th 362
    , 378 (Martinez).)
    We review the class certification ruling for an abuse of discretion. (
    Ayala, supra
    ,
    59 Cal.4th at p. 530; 
    Brinker, supra
    , 53 Cal.4th at p. 1022.) Trial courts are afforded
    great discretion in granting or denying certification because they are ideally situated to
    evaluate the efficiencies and practicalities of permitting group action. (Brinker, at
    p. 1022; 
    Sav-On, supra
    , 34 Cal.4th at pp. 326–327.) Generally, the trial court’s ruling
    will not be disturbed unless it is unsupported by substantial evidence or rests on improper
    criteria or erroneous legal assumptions. (Ibid.; Linder v. Thrifty Oil (2000) 
    23 Cal. 4th 429
    , 435–436.) In Ayala, our Supreme Court explained: “We review the trial court’s
    actual reasons for granting or denying certification; if they are erroneous, we must
    reverse, whether or not other reasons not relied upon might have supported the ruling.”
    (Ayala, at p. 530; accord, Alberts v. Aurora Behavioral Health Care (2015)
    
    241 Cal. App. 4th 388
    , 399; 
    Martinez, supra
    , 231 Cal.App.4th at p. 373.)
    II.    Duran
    In Duran, our Supreme Court discussed the use of surveys and statistical sampling
    as evidence to prove class action claims. “[I]f sufficient common questions exist to
    support class certification, it may be possible to manage individual issues through the use
    of surveys and statistical sampling. Statistical methods cannot entirely substitute for
    common proof, however. There must be some glue that binds class members together
    apart from statistical evidence. While sampling may furnish indications of an employer’s
    centralized practices [citation], no court has ‘deemed a mere proposal for statistical
    8
    sampling to be an adequate evidentiary substitute for demonstrating the requisite
    commonality, or suggested that statistical sampling may be used to manufacture
    predominate common issues where the factual record indicates none exist.’ ” (
    Duran, supra
    , 59 Cal.4th at p. 31; accord, 
    Martinez, supra
    , 231 Cal.App.4th at p. 379; see Tyson
    Foods, Inc. v. Bouaphakeo (2016) 
    136 S. Ct. 1036
    , 1049 [“Whether a representative
    sample may be used to establish classwide liability will depend on the purpose for which
    the sample is being introduced and on the underlying cause of action.”].)
    Our Supreme Court in Duran noted that “the outside salesperson exemption has
    the obvious potential to generate individual issues because the primary considerations are
    how and where the employee actually spends his or her workday.” (
    Duran, supra
    ,
    59 Cal.4th at p. 27.) The court stressed that “a statistical plan for managing individual
    issues must be conducted with sufficient rigor.” (Duran, at p. 31; accord, Mies v.
    Sephora U.S.A., Inc. (2015) 
    234 Cal. App. 4th 967
    , 985 (Mies).) The court noted that “[i]f
    the variability [in the class] is too great, individual issues are more likely to swamp
    common ones and render the class action unmanageable.” (Duran, at p. 33.)
    III.   The Trial Court’s Conclusions Regarding the 2015 Survey
    A. The 2015 Survey and Hildreth’s Criticism
    Plaintiffs’ theory of liability is that the Bank’s uniform classification of the BBO
    position as exempt was unlawful because the position allegedly was designed as an inside
    sales/telemarketing job, and realistically could only be performed by spending the
    majority of time inside the bank. In its order denying certification, the court noted that
    plaintiffs’ trial plan reported “[t]he stated purpose of the Krosnick survey was to
    determine the appropriate size of a sample group of witnesses needed to testify at trial in
    order to prove, by statistical inference [citation], Plaintiffs’ theory of liability and an
    aggregate amount of restitution.”
    The trial court found plaintiffs satisfied the requirements of ascertainability,
    numerosity, and adequacy of representation. But the court ruled plaintiffs failed to show
    9
    common questions of law or fact predominated over individual issues. In addition, the
    court concluded class treatment was not superior to other means of resolving the claims
    because individual issues could not be properly managed. We find these conclusions are
    supported by substantial evidence, primarily in the form of Hildreth’s declarations.
    Krosnick reported that 160 class members were randomly selected for the survey.
    A total of 87 interviews were completed6 and the response rate for the survey was 54
    percent. He indicated that 95.45 percent of the respondents reported spending 50 percent
    or less of their work time performing outside sales-related activities. Ninety point ninety-
    one percent of respondents who stated they spent 50 percent or more of their work time
    performing sales-related activities also reported that they worked an average of 63.18
    hours per week. Using the survey data, confidence intervals and margins of error were
    estimated for sample sizes relating to these findings, ranging from 15 to 50 people, with
    the results set forth in chart form. For example, as to the issue of time respondents had
    spent performing outside sales-related activities, a sample size of 15 people resulted in a
    margin of error of 11.01 percent, whereas a sample size of 50 people had a margin of
    error of 5.53 percent.
    Hildreth summed up his opinion of the 2015 Survey by concluding Krosnick’s
    “proposed ‘menu’ of potential sample sizes and accompanying margins of error is
    completely inaccurate. In reality, far larger sample sizes than those proposed would be
    required to approach the margins of error presented by Dr. Krosnick . . . .” Hildreth
    faulted the survey for having various forms of bias and error, as well as for its improper
    use of survey data. For example, Hildreth opined that the 2015 Survey was “a textbook
    example of self-selection bias” because it is based on a self-selected sample of
    respondents. By subtracting 40 hours from Krosnick’s weekly hour figures, Hildreth also
    6
    As the trial court noted, most of the tables in the technical appendix show the
    number of respondents as 66 rather than 87.
    10
    showed that the 2008 Survey produced estimates alternatively calculated at 13.82 or
    14.39 overtime hours per week, whereas the 2015 Survey produced estimates of 23
    overtime hours per week. Hildreth observed: “This significant difference between the
    two surveys, from the same population, is of an order of magnitude that illustrates the
    degree to which the statistics produced by the Krosnick surveys are not reliable.” He also
    concluded that Krosnick had not offered any scientific or tested explanation as to why
    such a dramatic difference would have been produced by surveying the same population
    with the same questions.7
    Hildreth opined that by comparing the total hours worked per week instead of
    average overtime hours per week, Krosnick had masked the extent to which the values in
    the two surveys differed. Krosnick’s methodology minimized the difference between the
    two surveys’ results and the associated estimated margins of error. Hildreth’s analysis
    demonstrated that a statistical comparison of the overtime hours only (versus total hours
    worked) showed that the responses given by the same respondents “are so different they
    might as well be completely unrelated.” He concluded that if Krosnick’s methodology
    were used to estimate the average hours of overtime worked per week, “testimony from
    the whole putative class would potentially be required to produce an acceptable relative
    or absolute margin of error . . . .”
    B. The Trial Court’s Reasoning
    The trial court started from the premise that in the absence of a viable “trial ready”
    trial plan, “certification must be denied.” The court first noted the need for plaintiffs to
    show predominance, which was contingent on the 2015 Survey data: “Plaintiffs need the
    survey to support selection of a sample size for the liability phase, to provide a basis for
    7
    Hildreth also reported that 18 individuals responded to both the 2008 Survey and
    the 2015 Survey. The average for the 18 matched responses from the same individuals
    shows an increase in the purported average hours worked per week by an average of 5.8
    hours. All but two individuals had changed their estimates, with six people reporting
    fewer hours and 10 others increasing the hours they worked.
    11
    an aggregate restitution determination and also, in this case, to provide some comfort to
    the court that [the Bank’s] affirmative defense will not lead to a proliferation of mini[]
    trials in the first phase of the case.”
    The trial court then focused on manageability, specifically, on the need for the trial
    plan to adequately address both liability with respect to plaintiffs’ prima facie case, as
    well as the Bank’s affirmative defense of the outside sales exemption. While initially
    satisfied with the manner in which the proposed trial plan had anticipated addressing the
    Bank’s affirmative defense, the court concluded plaintiffs could not establish a prima
    facie case as to liability because the 2015 Survey data was unreliable for any purpose.
    Second, even if the liability phase was allowed to proceed, the trial court
    determined that there was no manageable way to determine an aggregate restitution
    award using representative sampling because “the sample size is not scientifically
    supported for this purpose.” The damages phase of the trial would thus require testimony
    from each class member, leading to a “host of ‘mini trials.’ ” Finally, because of the
    unreliability suggested in the comparison between the 2008 and 2015 surveys, the court
    concluded that, as with the issue of restitution, “the affirmative defense [that at least some
    class members in fact worked most of their time outside the office] would [also] appear
    to require a host of ‘mini trials.’ ”
    The trial court found the differences between the responses to the 2008 Survey and
    the responses to the 2015 Survey, along with Krosnick’s use of total average hours
    worked per week rather than average overtime hours worked per week, to be dispositive
    of the certification issue. The first court noted that the 2008 Survey solicited essentially
    the same information as the 2015 Survey with respect to the total hours worked per week,
    yet the responses to the 2008 Survey yielded an average of 53.76 hours, whereas the 2015
    Survey yielded an average of 63.18 hours. We concur with the court’s observation that
    “[e]ven a non-mathematician can readily see that this is a difference of nearly ten hours
    per week, which is a large number in this context.”
    12
    The trial court found this discrepancy to be “tangible evidence” supporting
    Hildreth’s arguments regarding self-interest bias, tainting subject matter areas that were
    covered by the 2015 Survey only, namely, whether respondents spent most of their time
    inside or outside of the office. The bias identified by Hildreth could have skewed all the
    survey results upwards, potentially requiring a larger sample size for plaintiffs to prove
    their liability theory, as well as increasing the number of class members the Bank would
    call to establish its affirmative defense.
    The trial court found that a separate problem arose from plaintiffs’ proposal to use
    the same randomly selected witness group for the fixing of aggregate damages. The
    court noted that Krosnick had used average total hours worked per week rather than
    average overtime hours worked per week in his calculations. This choice was
    problematic because the difference in total hours worked “yields significantly different
    variation calculations than a comparison between far smaller numbers—here, the
    overtime hours derived by subtracting 40 from the total hours.” The court agreed with
    Hildreth that in the context of restitution, the focus had to be on overtime hours, not total
    hours worked. The variation within the class would be much greater in the overtime
    context, and “the necessary sample size needed to achieve the relative margin of error
    found acceptable by the court in [Bell v. Farmers Ins. Exchange (2004) 
    115 Cal. App. 4th 715
    (Bell)] is driven up dramatically.”8
    The trial court concluded that the 2015 Survey results “do not support the
    conclusion that—given the small class size in this case—a sample group of any size
    smaller than the entire class could ever yield an aggregate restitution award ‘as a matter
    of just and reasonable inference.’ [Citation.] In other words, the experience of each class
    member would need to be tested not only to determine his or her individual share, but
    8
    In Bell, the parties’ experts estimated average weekly overtime hours at 9.4
    hours, with a plus/minus 0.9-hour margin of error. Bell involved a random sample of
    nearly 300 individuals. 
    (Bell, supra
    , 115 Cal.App.4th at pp. 753, 755–756.)
    13
    also to arrive at an aggregate amount of restitution in the first place. This, of course, has
    severe manageability implications.” Although the court found that a survey like the 2015
    Survey could theoretically be used to support a finding as to whether the Bank’s policy of
    classifying all class members as exempt employees was lawful, it concluded that a
    comparison between the overlapping portions of the 2008 and 2015 surveys
    “demonstrates that the data from the 2015 Survey is not sufficiently reliable for
    Plaintiffs’ intended use.”
    We agree with the trial court that, at this point, the viability of plaintiffs’ motion to
    proceed as a class action is critically dependent on the evidentiary value of the 2015
    Survey. As the Duran court noted, the lower court in the prior trial “received no evidence
    establishing uniformity in how BBOs spent their time.” (
    Duran, supra
    , 59 Cal.4th at
    p. 32.) The disparity between the estimated overtime hours worked per week as reported
    in the 2008 and 2015 surveys (approximately 14 hours in 2008 versus 23 hours in 2015)
    is more than enough to convince us that substantial evidence supports the court’s decision
    to deny certification. The overtime figure nearly doubled in the 2015 Survey, with a
    difference of almost 10 hours per person per week on average. Plaintiffs do not
    satisfactorily explain this discrepancy, which the lower court found to have “taint[ed] the
    use of the 2015 Survey not only on the subject matter where the two surveys overlap but
    also on the subject matter covered only by the 2015 Survey—to wit, where respondents
    say they spent most of their time, whether it was inside or outside the office.” We
    conclude the court did not abuse its discretion in ruling that the 2015 Survey is unreliable
    for the purpose of showing that common issues would predominate at trial. We proceed
    to specifically address plaintiffs’ arguments on appeal.
    IV.    Plaintiffs’ Arguments
    A. Whether the Trial Plan Adequately Manages the Affirmative Defense
    As part of its ruling, the trial court stated that plaintiffs’ trial plan “fails to resolve
    the manageability issues posed by the affirmative defenses, and specifically the argument
    14
    that at least some of the class members in fact worked most of their time outside the
    office.” Plaintiffs assert this passage indicates the court erroneously believed that a
    liability determination in a misclassification case must identify which class members
    were misclassified. They claim their theory of the case, that the Bank did not have a
    realistic expectation that its BBOs would primarily engage in outside sales activities, is
    fully consistent with Duran, and assert any finding of liability on this point would be
    equally applicable to all BBOs.
    Plaintiffs rely heavily on Justice Liu’s concurrence in 
    Duran, supra
    , 
    59 Cal. 4th 1
    and on 
    Martinez, supra
    , 
    231 Cal. App. 4th 362
    in asserting that “ ‘the ultimate question is:
    what are “the realistic requirements of the job?” ’ ”9 Plaintiffs argue that liability in a
    misclassification case is determined based not on how employees actually spend their
    time, but rather on whether the employer realistically expected employees to spend the
    majority of their time on exempt duties. In their view, if an employer did not realistically
    expect employees to spend the majority of their time on exempt duties, then its
    classification of the position as exempt is unlawful and liability is thereby established for
    the entire class, even for those class members who actually spent the majority of their
    time on exempt duties.
    Justice Liu’s concurrence did not alter the Duran court’s conclusion that “the
    question is ‘first and foremost’ how the employee’s time is actually spent.” (
    Duran, supra
    , 59 Cal.4th at p. 27.) Instead, the concurrence was drafted “to further elucidate the
    proper inquiry at the class certification stage of an employee misclassification case and
    the duty of the trial courts to manage individual issues in a class action trial. (Id. at
    9
    Indeed, in their reply brief plaintiffs assert that their appeal is centered on “how
    to interpret Justice Liu’s statement in Duran that an employee who exceeds the 50%
    outside-sales threshold should be classified as non-exempt—i.e., eligible for overtime
    pay—if devoting that much time to outside sales is not a realistic requirement of the job.”
    A concurrence is not the opinion of the court and is not binding. (People v. Amadio
    (1971) 
    22 Cal. App. 3d 7
    , 14.)
    15
    p. 51.) Justice Liu sought to reemphasize that in some cases, an employer’s “realistic
    expectations” or the “realistic requirements of the job” may be shown by common proof.
    (Id. at pp. 52–53.) Specifically, he sought to address “[w]hat would it mean to ‘manage
    individual issues’ in the context of an employee misclassification case?” (Id. at p. 55.)
    He then set forth two ways for a trial court to frame a representative sampling approach
    to proving class liability. First, he advised that consideration of individual issues should
    inform the design of any sampling or similar statistical approach. Second, he
    acknowledged that a defendant is entitled to raise individual issues that challenge the
    results of a valid sampling plan as implemented. (Duran, at pp. 55–56.) It does not
    appear to us that the concurrence is inconsistent with the majority opinion or that it
    suggests a different standard should apply when analyzing certification motions.
    In Martinez, the appellate court concluded the trial court abused its discretion by
    denying the plaintiffs’ motion for certification of a class of salaried managerial
    employees who had allegedly been misclassified. The plaintiffs alleged that the
    employer’s operations, hiring, training, and other practices were uniform throughout the
    restaurant chain. Because the restaurants were typically understaffed, managers routinely
    filled in where needed, working as cooks, servers, bussers, hosts, stockers, bartenders,
    and kitchen staff. (
    Martinez, supra
    , 231 Cal.App.4th at pp. 368–369.) Each of the
    plaintiffs’ declarants estimated he or she had spent the majority of time performing such
    hourly tasks, but later admitted they were unable to estimate the amount of time spent on
    exempt versus nonexempt tasks. (Id. at pp. 369, 371.) The trial court found all putative
    class members performed similar duties and responsibilities pursuant to a finite task list.
    (Id. at p. 371, fn. 12.) But it concluded the plaintiffs’ claims were not typical and they
    were inadequate class representatives because they were unable to estimate the number of
    hours spent on individual exempt and nonexempt tasks and their job duties varied from
    day to day. Common questions did not predominate because there were “significant
    individual disputed issues of fact relating to the amount of time spent by individual class
    16
    members on particular tasks,” and such variability would require adjudication of the
    affirmative defense of exemption for each class member. (Id. at pp. 371–372.)
    The Court of Appeal reversed. Citing 
    Ayala, supra
    , 
    59 Cal. 4th 522
    , Martinez
    cautioned that courts should “avoid focusing on the inevitable variations inherent in
    tracing the actions of individuals and to instead focus on the policies—formal or
    informal—in force in the workplace.” (
    Martinez, supra
    , 231 Cal.App.4th at p. 380.) The
    plaintiffs’ theory of liability—that by classifying all managerial employees as exempt, the
    employer had violated overtime laws—was “ ‘by its nature a common question eminently
    suited for class treatment.’ ” (Ibid.) Significant common issues pervaded: the employer
    operated a chain of restaurants governed by the same policies and procedures; exempt
    employees were expected to work at least 50 hours per week; and the parties had
    identified a finite task list, suggesting jobs were “ ‘highly standardized.’ ” (Ibid.) The
    “gist of plaintiffs’ claim” was that “regardless of the patina of managerial discretion
    expressed in their job description, they functioned consistently as utility workers, cross-
    trained in all tasks, who could be assigned to fill in where needed without affecting the
    labor budget or requiring overtime compensation. The crux of the matter, therefore, lies
    in whether a typically nonexempt task becomes exempt when performed by a managerial
    employee charged with supervision of other employees.” (Id. at p. 381, fn. omitted.)
    Martinez also reasoned that under Sav-On, “courts in overtime exemption cases
    must proceed through analysis of the employer’s realistic expectations and classification
    of tasks rather than asking the employee to identify in retrospect whether, at a particular
    time, he or she was engaged in an exempt or nonexempt task.” (
    Martinez, supra
    ,
    231 Cal.App.4th at p. 382.) “The court here must ask whether [the employer’s] realistic
    expectations and the actual requirements of the job resulted in the exercise of
    supervisorial discretion by managerial employees or instead relegated employees to [a]
    utility role.” (Id. at p. 383.) By focusing on the employees’ inability to identify what
    tasks they performed and for what purpose, Martinez concluded the trial court had failed
    17
    to consider Sav-On’s explicit direction that courts need not assess an employer’s
    affirmative exemption defense against every class member’s claim before certification.
    (Ibid., citing 
    Sav-On, supra
    , 34 Cal.4th at pp. 337–338.)
    Martinez is distinguishable in that the central dispute here is where BBOs spent
    the majority of their time, and not on whether they spent the majority of their time on
    exempt tasks. Unlike Martinez, the crux of the matter here is not task classification.
    Instead, the issue is how much time each putative class member spent outside the Bank’s
    locations. As the trial court stated, “a declaratory judgment that the policy was unlawful
    would resolve nothing because to determine restitution each claimant would have to be
    called to testify as to where he or she spent most of their time and how much overtime
    they worked. Thus a declaratory judgment on the policy, standing alone, serves no
    purpose.” The court conceded that the result might have been different “if a bona fide
    statistical survey provided reason to believe that only a few class members may have
    been properly classified and those could be readily identified; but the survey evidence
    here provides no such assurance.”
    In our view, the trial court properly focused on manageability issues pertaining to
    the affirmative defenses, while fully understanding plaintiffs’ theory of liability.10 In the
    10
    The trial court accurately described plaintiffs’ theory of the case as follows:
    “Plaintiffs assert that because the BBO position was designed, managed and monitored as
    an inside sales job, and as a consequence that is how the BBOs uniformly spent their
    time, Defendant violated mandatory overtime wage laws by classifying all BBOs as
    exempt. They intend to show, if given the chance, that it was not realistic for Defendant
    to expect that putative class members would be able to perform the duties and meet the
    production goals of the BBO position by ‘customarily and regularly work[ing] more than
    half the working time away from the employer’s place of business selling tangible or
    intangible items or obtaining orders or contracts for products, services or use of facilities’
    [citation]. In other words, Plaintiffs intend to show that Defendant ‘had a consistently
    applied policy or uniform job requirements and expectations contrary to a Labor Code
    exemption.’ [Citation.] Under this theory, the focus of the liability inquiry would be on
    the ‘realistic requirements of the [BBOs] job’ [citation], i.e., whether it was realistic for
    Defendant to expect that the BBOs would be ‘outside’ more than half of the time, given
    18
    portion of the court’s decision about which plaintiffs complain, the court observed that if
    “the vast majority of the class sample would credibly testify that most of their time was
    spent inside the office and the confidence interval was relatively narrow, then one might
    infer that the number of witnesses the defense would call on its affirmative defense would
    be relatively small. But if the results relied upon by Krosnick are as unreliable as
    suggested by a comparison of the 2008 and 2015 surveys, then the court cannot take
    much comfort in the notion that Plaintiffs’ trial plan adequately manages the affirmative
    defenses. As with the issue of restitution, the affirmative defense would appear to require
    a host of ‘mini trials.’ ”11
    Even if the trial court did err in its assessment of plaintiffs’ theory, in the same
    section of its decision containing the passage quoted above, the court also faulted their
    trial plan because, given the overall unreliability of the 2015 Survey, there was no way
    for plaintiffs to establish a prima facie case on the issue of liability. Additionally, the
    court concluded that even if the liability phase were to proceed, plaintiffs would not be
    able use representative sampling to establish an aggregate restitution award. Thus, the
    court found multiple flaws in plaintiffs’ trial plan.12
    the nature of their job duties and performance expectations. Such a finding would be
    based on evidence of the actual experiences of putative class members who were ‘getting
    the job done’ as to where they spent their time doing so.”
    11
    Trial courts must determine whether individual issues, including those arising
    from affirmative defenses, can be managed fairly and efficiently. The Supreme Court in
    Duran stated: “If statistical evidence will comprise part of the proof on class action
    claims, the court should consider at the certification stage whether a trial plan has been
    developed to address its use. A trial plan describing the statistical proof a party
    anticipates will weigh in favor of granting class certification if it shows how individual
    issues can be managed at trial.” (
    Duran, supra
    , 59 Cal.4th at pp. 31–32.) However, the
    court cautioned, “a class action trial management plan may not foreclose the litigation of
    relevant affirmative defenses, even when these defenses turn on individual questions.”
    (Id. at p. 34.)
    12
    To the extent plaintiffs criticize the trial court for relying on Teamsters v. United
    States (1977) 
    431 U.S. 324
    , we find no error. The court did not rely on Teamsters in its
    19
    It is established that even when the party proposing a class asserts “the employer
    consistently imposed a uniform policy or de facto practice on class members, the party
    must still demonstrate that the illegal effects of this conduct can be proven efficiently and
    manageably within a class setting.” (
    Duran, supra
    , 59 Cal.4th at p. 29; see Koval v.
    Pacific Bell Telephone Co. (2014) 
    232 Cal. App. 4th 1050
    , 1060 [“existence of a uniform
    policy does not limit a trial court’s inquiry into whether class action treatment is
    appropriate”] and Arenas v. El Torito Restaurants, Inc. (2010) 
    183 Cal. App. 4th 723
    , 734
    [“trial court concluded plaintiffs’ theory of recovery—that managers, based solely on
    their job descriptions, were as a rule misclassified—was not amenable to common proof”
    given evidence employees’ “duties and time spent on individual tasks varied widely”].)
    “To the contrary, ‘courts have routinely concluded that an individualized inquiry is
    necessary even where the alleged misclassification involves application of a uniform
    policy. ” 
    (Mies, supra
    , 234 Cal.App.4th at p. 984.)
    Plaintiffs also fault the trial court for rejecting its proposal to address how to
    proceed if evidence on the average hours worked produced an unacceptable margin of
    error. In that case, they had proposed the parties could continue to submit evidence “until
    the margin of error reached an acceptable number.” The trial court rejected this proposal,
    stating that “it is too late in this litigation for another ‘provisional’ certification order that
    is subject to a further development of a trial plan.” Given that this case has lasted well
    over a decade and that one trial has already occurred and been reversed, and that two
    appellate court decisions on this matter have already been issued, we fully support the
    trial court’s sentiment on this point. Additionally, the Supreme Court in Duran
    specifically stated: “The trial court is of course free to entertain a new certification
    motion on remand, but if it decides to proceed with a class action it must apply the
    decision, but instead was simply quoting a passage in Duran in which the Supreme Court
    criticized plaintiffs for relying on Teamsters.
    20
    guidelines set out here,” including assessing manageability of affirmative defenses.
    (
    Duran, supra
    , 59 Cal.4th at p. 33, italics added.)
    B. Variation in Restitution
    Plaintiffs also claim the trial court erred by finding that variation in restitution
    defeats certification. They start off on the wrong foot, however, by asserting that the trial
    court “held that plaintiffs satisfied the requirements for predominance and manageability
    with respect to liability.” Actually, the court found that the 2015 Survey, if it had been
    the only survey, might have been used to measure the extent of variation within the class
    on the issue of whether BBOs spent more than half of their time in the office. However,
    this observation was tempered by the court’s acceptance of Hildreth’s opinion that
    self-interest bias caused respondents to overestimate the time spent inside the office.
    This bias, the existence of which was supported by the discrepancies between the two
    Krosnick surveys, suggested to the court that individual variations would necessitate a
    larger sample size than plaintiffs suggested. Thus, even apart from restitution, the court
    did not find that the 2015 Survey supported a finding of predominance and manageability
    with respect to liability.
    On the issue of restitution, plaintiffs assert the trial court erred in concluding the
    survey was going to be used as the sole basis for fixing the amount. However, even
    plaintiffs admit that the testimony of the randomly drawn sample “would have been a
    substantial factor in the court’s ultimate determination of the amount of restitution.”
    Plaintiffs proposed establishing aggregate restitution by using the trial court’s finding of
    average overtime hours worked by a representative witness group (the size of which
    would be based on the flawed 2015 Survey), which would then be extrapolated and
    applied in the second phase of trial to the individual BBOs’ payroll records to determine
    each individual’s recovery.
    We cannot conclude the trial court committed legal error in its assessment of the
    impact the 2015 Survey evidence would have in the manageability of the restitution
    21
    phase of trial. Whether the court was correct in concluding that no sample of any size
    less than the entire class could ever yield an aggregate restitution award, the fact remains
    that the 2015 Survey evidence offered by plaintiffs was seriously flawed, leaving the
    court with no alternative except to anticipate that every class member would need to
    testify.13 The court properly rejected Plaintiffs’ plan for determining aggregate restitution
    because the plan rested on a survey that was wholly unreliable.
    Plaintiffs also contend the trial court erred by holding them to a higher standard
    than required by law with respect to the determination of an aggregate restitution award.
    Contrary to plaintiffs’ argument, the court was not holding them to a higher standard.
    Instead, it was stating its view of the state of the evidence, specifically, that the 2015
    Survey was worthless as a sampling tool, necessarily requiring each class member’s
    testimony as to restitution.
    V.     Rejection of 2015 Survey
    Plaintiffs use the final arguments in their opening brief to address the central issue
    in this appeal, namely, whether the trial court erred in rejecting the 2015 Survey. They
    first assert that the survey “satisfied all of Duran’s conditions for the use of statistical
    evidence in a class action.” As they note, however, one of these requirements is that the
    margin of error cannot be “intolerably high.” (
    Duran, supra
    , 59 Cal.4th at p. 46.)
    The trial court rejected the 2015 Survey because of the difference between the
    average hours worked as reported in the 2008 Survey versus the 2015 Survey. Again, the
    2008 Survey reported an average of approximately 54 hours per week, while the 2015
    Survey reported an average of approximately 63 hours per week. Because the court
    could not reconcile the differences between the two surveys, it concluded the 2015
    13
    Plaintiffs’ related argument that the burden should have been on the Bank as the
    employer to come forward with evidence as to the number of hours worked because it
    had kept inaccurate or incomplete records has been addressed previously in 
    Duran, supra
    , 59 Cal.4th at p. 41.
    22
    Survey estimate of the amount of time BBOs were engaged in outside sales work was
    also unreliable. Plaintiffs argue that in doing so “the trial court exercised its discretion in
    a way contrary to the internal rules governing statistical analysis.” Their arguments are
    not persuasive.
    Plaintiffs first attribute the discrepancy in the memories of the class members to
    “the passage of time,” noting the class period goes back to December 1997. Thus, in
    2015, members were being asked to recall events up to 17 years earlier.14 Plaintiffs
    appear to urge the differences do not matter here because these same discrepancies will
    occur whether the trial proceeds on an individual basis or a class action basis.15 We
    disagree. In individual actions, the effects of the passage of time upon each witness’s
    memory can be explored by the fact finder. In a class action, it is impossible to do so,
    and plaintiffs do not advance any scientific principles suggesting that statistical evidence
    can be used to accurately reflect the impact of the passage of time on survey respondents
    in a manner that can be extrapolated to the class as a whole. While plaintiffs argue again
    that the burden of uncertainty should not be shifted to them because the Bank failed to
    keep accurate records, the fundamental inquiry here is whether this matter can proceed as
    a class action, not which party is to blame for the fact that plaintiffs’ evidence fails to
    support a finding of commonality.
    Plaintiffs also argue that the difference between the average hour estimates from
    the two surveys is not important because the estimates independently have low relative
    margins of error. They note the 2008 Survey had a relative margin of error of 13.50
    percent while the corresponding margin of error in the 2015 Survey was 14.96 percent,
    14
    The trial court was well aware of this point, noting the “gaps in the passage of
    time between the underlying events and the surveys and between the surveys themselves
    are unusually large . . . . Some of the problems here may be traced to this circumstance.”
    15
    As an aside, this argument does little to inspire confidence in the 2015 Survey
    results.
    23
    observing that we approved a 9.57 percent relative margin of error in 
    Bell, supra
    ,
    
    115 Cal. App. 4th 715
    . However, the margins of error are artificially low because they are
    based on the total hours worked, and not overtime hours. Further, it is the comparison of
    the two surveys that reveals the inconsistency, irrespective of whether each survey is
    internally consistent within itself.
    Plaintiffs’ final argument—that the Bank and its attorneys skewed the results of
    the 2015 Survey by sending the Biggs letter to putative class members—is not well taken.
    Plaintiffs do not cite to any evidence in the record suggesting that the letter “infuse[d] the
    survey with bias.”
    In sum, the trial court did not abuse its discretion in concluding that the wide
    discrepancy between the 2015 and 2008 survey results demonstrated that the 2015 Survey
    was unreliable, and served as tangible evidence that the survey results were tainted by
    bias. Accordingly, substantial evidence supports the court’s finding that the survey data
    was unreliable as evidence of uniformity in how BBOs spent their time, and unreliable as
    statistical support for selecting a representative witness group to testify as to liability or
    restitution without causing the inquiry to devolve into a multiplicity of individual mini
    trials, especially in light of the Bank’s right to call witnesses outside the sample to
    establish its affirmative defense.16
    16
    After oral argument and the submission of this case, plaintiffs requested this
    court to consider an appellate case, now published, on employment class actions. The
    case is ABM Industries Overtime Cases (Dec. 11, 2017, A132387, A133077, A133695)
    ___ Cal.App.5th ___ [
    2017 WL 6887032
    ] (ABM Industries). We have decided to review
    the case and find it clearly distinguishable from our matter.
    First of all, ABM Industries involved the denial of class certification where the
    employees’ witness, Woolfson, the sole expert on either side concerning the issue of class
    certification, was found by the trial court to be unqualified. The employer had offered no
    expert to challenge the employees’ witness. Indeed, “ABM had failed to lodge a formal
    objection to the evidence [of the employees’ expert], move to strike the [expert’s]
    declaration, depose Woolfson on his credentials or conclusions, and/or provide their own
    contrary expert opinion.” (ABM Industries, supra, ___ Cal.App.5th ___ [
    2017 WL 24
                                         DISPOSITION
    The order denying class certification is affirmed.
    6887032, at p. 5].) Based on the record, the appellate court concluded the trial court had
    engaged in an abuse of discretion in excluding the employees’ expert evidence. (Id. at
    p. 6.)
    In our case, the trial court did not exclude Krosnick’s expert evidence.
    Importantly, the trial court fully considered the evidence offered by both sides’ expert
    witnesses. In a lengthy opinion, the court found the certification issue focused on the
    credibility of expert testimony and concluded the Bank’s witness was more credible, as
    noted in our discussion.
    Additionally, in ABM Industries, the trial court rulings on the admissibility of the
    expert Woolfson’s testimony had a serious impact on the certification question. “[W]e
    conclude that the trial court’s denial of class certification—including its decision
    regarding the admissibility of the Woolfson materials—rested on improper criteria and
    erroneous legal assumptions, amounting to an abuse of discretion.” (ABM Industries,
    supra, ___ Cal.App.5th ___ [
    2017 WL 6887032
    , at p. 18].)
    In contrast, our ruling enjoys the benefit of full review of the employment issues at
    U.S. Bank not only by this court on two occasions, but also the full assessment by our
    Supreme Court. In a word, we find the circumstances of the BBOs to be easily
    distinguishable from the circumstances of the janitors employed by ABM Industries
    discussed in plaintiff’s latest authority.
    25
    _________________________
    Dondero, J.
    We concur:
    _________________________
    Humes, P. J.
    _________________________
    Margulies, J.
    A148817 Duran et al. v. U.S. Bank National Association
    26
    Trial Court:           Alameda County Superior Court
    Trial Judge:           Hon. Wynne Carvill
    Counsel:
    Wynne Law Firm, Edward J. Wynne, for Plaintiffs and Appellants.
    Carothers Disante & Freudenberger LLP, Timothy M. Freudenberger, Alison L.
    Tsao, Kent J. Sprinkle, Robin E. Largent, Teresa W. Ghali, for Defendant and
    Respondent.
    A148817 Duran et al. v. U.S. Bank National Association
    27