Allied Concrete and Supply Co. v. Ibt , 904 F.3d 1053 ( 2018 )


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  •                  FOR PUBLICATION
    UNITED STATES COURT OF APPEALS
    FOR THE NINTH CIRCUIT
    ALLIED CONCRETE AND SUPPLY               No. 16-56546
    CO., a California corporation;
    CALPORTLAND COMPANY, a                     D.C. No.
    California Corporation; GARY            CV 16-4830 RGK
    BALE REDI-MIX CONCRETE, INC., a
    California corporation; HOLLIDAY
    ROCK CO., INC., a California
    corporation; NATIONAL READY
    MIXED CONCRETE CO., a
    California corporation;
    ROBERTSON’S READY MIX, LTD., a
    California limited partnership;
    SPRAGUES ROCK AND SAND
    COMPANY, a California
    corporation; SUPERIOR READY MIX
    CONCRETE L.P.,
    Plaintiffs-Appellees,
    v.
    CHRISTINE BAKER, in her official
    capacity as the Director of the
    Department of Industrial Relations
    of the State of California; JULIE A.
    SU, in her official capacity as
    Labor Commissioner of the State
    of California, Division of Labor
    Standards Enforcement,
    Defendants,
    2        ALLIED CONCRETE AND SUPPLY V. IBT
    INTERNATIONAL BROTHERHOOD OF
    TEAMSTERS,
    Intervenor-Defendant-Appellant.
    ALLIED CONCRETE AND SUPPLY               No. 17-55343
    CO., a California corporation;
    CALPORTLAND COMPANY, a                     D.C. No.
    California Corporation; GARY            CV 16-4830 RGK
    BALE REDI-MIX CONCRETE, INC., a
    California corporation; HOLLIDAY
    ROCK CO., INC., a California
    corporation; NATIONAL READY
    MIXED CONCRETE CO., a
    California corporation;
    ROBERTSON’S READY MIX, LTD., a
    California limited partnership;
    SPRAGUES ROCK AND SAND
    COMPANY, a California
    corporation; SUPERIOR READY MIX
    CONCRETE L.P.,
    Plaintiffs-Appellees,
    v.
    CHRISTINE BAKER, in her official
    capacity as the Director of the
    Department of Industrial Relations
    of the State of California; JULIE A.
    SU, in her official capacity as
    Labor Commissioner of the State
    of California, Division of Labor
    Standards Enforcement,
    Defendants-Appellants.
    ALLIED CONCRETE AND SUPPLY V. IBT             3
    ALLIED CONCRETE AND SUPPLY              No. 17-55503
    CO., a California corporation;
    CALPORTLAND COMPANY, a                    D.C. No.
    California Corporation; GARY           CV 16-4830 RGK
    BALE REDI-MIX CONCRETE, INC., a
    California corporation; HOLLIDAY
    ROCK CO., INC., a California              OPINION
    corporation; NATIONAL READY
    MIXED CONCRETE CO., a
    California corporation;
    ROBERTSON’S READY MIX, LTD., a
    California limited partnership;
    SPRAGUES ROCK AND SAND
    COMPANY, a California
    corporation; SUPERIOR READY MIX
    CONCRETE L.P.,
    Plaintiffs-Appellants,
    v.
    CHRISTINE BAKER, in her official
    capacity as the Director of the
    Department of Industrial Relations
    of the State of California; JULIE A.
    SU, in her official capacity as
    Labor Commissioner of the State
    of California, Division of Labor
    Standards Enforcement,
    Defendants-Appellees.
    4           ALLIED CONCRETE AND SUPPLY V. IBT
    Appeals from the United States District Court
    for the Central District of California
    R. Gary Klausner, District Judge, Presiding
    Argued and Submitted March 7, 2018
    Pasadena, California
    Filed September 20, 2018
    Before: A. Wallace Tashima, Richard A. Paez,
    and Jacqueline H. Nguyen, Circuit Judges.
    Opinion by Judge Tashima
    SUMMARY*
    Labor Law
    The panel affirmed in part and reversed in part the district
    court’s judgment and remanded in an action brought by a
    group of ready-mix concrete suppliers, challenging California
    Labor Code § 1720.9, which amended California’s prevailing
    wage laws to include delivery drivers of ready-mix concrete.
    The district court denied a motion of the International
    Brotherhood of Teamsters (“IBT”) to intervene on the side of
    the State to defend the law, and it granted the State’s motion
    to dismiss plaintiffs’ claim that § 1720.9 was preempted by
    the Federal Aviation Administration Authorization Act. The
    *
    This summary constitutes no part of the opinion of the court. It has
    been prepared by court staff for the convenience of the reader.
    ALLIED CONCRETE AND SUPPLY V. IBT                   5
    district court granted summary judgment in favor of plaintiffs
    on their claim that § 1720.9 violated the Equal Protection
    Clause of the Fourteenth Amendment, ruling that, under the
    rational basis test, there were no legally relevant differences
    between ready-mix drivers and other delivery drivers;
    therefore, the State did not have any legitimate justification
    for singling out the ready-mix suppliers.
    Reversing the district court’s grant of summary judgment
    in favor of plaintiffs on their equal protection claim, the panel
    concluded that the district court wrongly disregarded as
    irrelevant certain differences between ready-mix drivers and
    other drivers that the legislature could have relied on in
    extending the prevailing wage law. The panel explained that
    the California Supreme Court has stated that prevailing wage
    laws further goals such as: (1) generally protecting
    employees on public works projects, (2) benefitting the public
    through the superior efficiency of well-paid employees, and
    (3) permitting union contractors to compete with nonunion
    contractors. The panel held that the legislature could have
    rationally concluded that extending the prevailing wage law
    to ready-mix drivers ahead of other drivers would further
    these respective goals because ready-mix drivers: (1) are
    more integrated into the construction process than other
    materials drivers and should be paid accordingly; (2) are
    more skilled than other drivers and provide a material that is
    more important to public works projects than other materials
    such that paying the prevailing wage will attract superior
    drivers and improve public works; and (3) are more likely to
    be unionized and, therefore, vulnerable to underbidding.
    Reversing the district court’s denial of IBT’s motion to
    intervene, the panel held that the union had a significantly
    protectable interest at stake in the case. The panel concluded
    6         ALLIED CONCRETE AND SUPPLY V. IBT
    that IBT’s appeal was not moot in light of the reversal on the
    equal protection claim.
    The panel affirmed the district court’s dismissal of
    plaintiffs’ claim of FAAAA preemption because the
    prevailing wage law was not related to prices, routes, and
    services within the meaning of the FAAAA’s preemption
    clause.
    COUNSEL
    Ken Lau (argued), Assistant Chief Counsel; Christopher
    Jagard, Chief Counsel; Office of the Director—Legal Unit,
    Department of Industrial Relations, Oakland, California;
    John J. Korbol and Mi Kim, Counsel, Office of the
    Director—Legal Unit, Department of Industrial Relations,
    Los Angeles, California; for Defendants-Appellants/Cross-
    Appellees.
    Michael G. Yoder (argued) and Christopher S. Whittaker,
    O’Melveny & Myers LLP, Newport Beach, California; Anton
    Metlitsky, O’Melveny & Myers LLP, New York, New York;
    for Plaintiffs-Appellees/Cross-Appellants.
    Scott A. Kronland (argued), Stacey M. Leyton, and Eric P.
    Brown, Altshuler Berzon LLP, San Francisco, California, for
    Intervenor-Defendant-Appellant/Amicus Curiae.
    Kerry Shapiro, Jon Wilner, and Matthew J. Sanders, Jeffer
    Mangels Butler & Mitchell LLP, San Francisco, California,
    for Amicus Curiae California Construction and Industrial
    Materials Association.
    ALLIED CONCRETE AND SUPPLY V. IBT                  7
    OPINION
    TASHIMA, Circuit Judge:
    California’s general prevailing wage laws ensure that
    workers employed on public works projects are paid a
    minimum wage. In 2015, California amended the prevailing
    wage laws to include delivery drivers of ready-mix concrete.
    Cal. Lab. Code § 1720.9.
    A group of ready-mix concrete suppliers (collectively,
    “Plaintiffs”) challenged § 1720.9, alleging that it violated the
    Equal Protection Clause of the Fourteenth Amendment to the
    United States Constitution (“equal protection claim”) and that
    the Federal Aviation Administration Authorization Act of
    1994 (“FAAAA”) preempted the state law. The International
    Brotherhood of Teamsters (“IBT”) moved to intervene on the
    side of the State to defend the law.
    The district court denied IBT’s motion to intervene and
    granted the State’s motion to dismiss Plaintiffs’ FAAAA
    preemption claim. However, the district court granted
    Plaintiffs’ summary judgment motion on the equal protection
    claim, concluding that § 1720.9 did not pass muster under the
    rational basis test. The court reasoned that there were no
    legally relevant differences between ready-mix drivers and
    other delivery drivers; therefore, the State did not have any
    legitimate justification for singling out the ready-mix
    suppliers.
    We conclude that the district court wrongly disregarded
    as irrelevant certain differences between ready-mix drivers
    and other drivers that the legislature could have relied on in
    extending the prevailing wage law. We thus reverse the
    8         ALLIED CONCRETE AND SUPPLY V. IBT
    district court’s grant of summary judgment in favor of
    Plaintiffs and order the court to enter judgment on behalf of
    Defendants. Likewise, we hold that IBT had a significantly
    protectable interest at stake in the case and we reverse the
    district court’s denial of IBT’s motion for leave to intervene.
    On the FAAAA preemption question, we affirm the district
    court’s dismissal of Plaintiffs’ claim.
    BACKGROUND
    1. Prevailing Wage Laws and California Labor Code
    § 1720.9
    California’s prevailing wage law establishes the minimum
    wage that workers employed on “public works” must receive.
    See Cal. Lab. Code §§ 1720, 1771. “Public works” is
    generally defined as construction or related work, done under
    contract, and paid for in any part out of public funds. 
    Id. § 1720(a)(1).
    The California Supreme Court has described
    the purpose of the general prevailing wage law:
    The overall purpose of the prevailing wage
    law . . . is to benefit and protect employees on
    public works projects. This general objective
    subsumes within it a number of specific goals:
    to protect employees from substandard wages
    that might be paid if contractors could recruit
    labor from distant cheap-labor areas; to permit
    union contractors to compete with nonunion
    contractors; to benefit the public through the
    superior efficiency of well-paid employees;
    and to compensate nonpublic employees with
    higher wages for the absence of job security
    ALLIED CONCRETE AND SUPPLY V. IBT                  9
    and employment benefits enjoyed by public
    employees.
    Lusardi Constr. Co. v. Aubry, 
    824 P.2d 643
    , 649 (Cal. 1992).
    The California Director of Industrial Relations (the
    “Director”) publishes the prevailing wage rates and enforces
    the law by collecting payroll (and other related) records from
    employers. Cal. Lab. Code §§ 1771.4, 1776. Further, when
    there is a question about the applicability of the prevailing
    wage law, the Director determines “whether a specific project
    or type of work is a public work.” 
    Id. at §
    1773.5(b); see also
    
    id. § 1773(c)
    (establishing administrative appeal process).
    When there is a dispute, courts may also review whether a
    worker is entitled to prevailing wages. See, e.g., Williams v.
    SnSands Corp., 
    67 Cal. Rptr. 3d 606
    (Ct. App. 2007); O.G.
    Sansone Co. v. Dep’t of Transp., 
    127 Cal. Rptr. 799
    (Ct. App.
    1976). Courts and the Director both ask whether the worker’s
    task was “functionally related to the process of construction,”
    and “an integrated aspect of the ‘flow’ process of
    construction.” O.G. 
    Sansone, 127 Cal. Rptr. at 804
    ; see also
    A&A Ready Mix Concrete, Public Works Case No. 99-037
    (Dep’t of Indus. Relations Apr. 10, 2000).
    On October 10, 2015, Governor Edmund G. Brown, Jr.,
    signed AB 219, which amended California’s prevailing wage
    law by adding Labor Code §1720.9. It provides that “public
    works” include “the hauling and delivery of ready-mixed
    concrete to carry out a public works contract” regardless of
    who employs the driver or whether the driver is delivering
    from a dedicated batch plant. Cal. Lab. Code § 1720.9.
    Therefore, all ready-mix drivers delivering to public works
    must be paid prevailing wages. Before adopting the final bill,
    the California Legislature considered a version of AB 219
    10           ALLIED CONCRETE AND SUPPLY V. IBT
    that would have required payment of prevailing wages to
    asphalt delivery drivers as well, but ultimately limited the
    expansion to ready-mix concrete drivers.
    Ready-mix concrete is defined as “concrete that is
    manufactured in a factory or a batching plant, according to a
    set recipe, and then delivered in a liquefied state by mixer
    truck for immediate incorporation into a project.” 
    Id. § 1720.9(b).
    Its ingredients are prepared and mixed at a
    concrete plant. Production of concrete is time-sensitive
    because concrete begins to set quickly after water is added.
    Ready-mix is delivered in specialized trucks with a rotating
    tank. 
    Id. Drivers of
    ready-mix trucks control the amount of
    water added to the rotating tank and the speed at which the
    tank spins, meaning that they can alter the nature of the
    concrete.1 By contrast, even though asphalt delivery may also
    be time-sensitive, drivers transport asphalt in dump trucks,
    rather than mixing trucks, and drivers cannot alter the asphalt
    once it is in the truck. For certain projects, such as paving
    roads, asphalt and ready-mix are interchangeable, for others,
    such as building walls and other structural supports, the
    materials are not substitutes.
    2. Procedural Background
    On June 30, 2016, Plaintiffs filed a complaint against the
    Director and the Labor Commissioner of the State of
    California (collectively, the “State”).2 The Complaint alleged
    1
    The ready-mix drivers do not always have discretion to decide how
    much water to add, but must follow instructions from engineers.
    2
    Plaintiffs also sued Governor Brown, but later dismissed the case as
    to him.
    ALLIED CONCRETE AND SUPPLY V. IBT                        11
    that § 1720.9 violates the Equal Protection Clause of the
    Constitution, or alternatively, is preempted by the FAAAA,
    and sought injunctive and declaratory relief. Before the State
    answered the complaint, IBT moved for leave to intervene,
    either as of right or permissively. See Fed. R. Civ. P. 24(a) &
    (b). On August 22, 2016, Plaintiffs sought a preliminary
    injunction on their equal protection claim. Before the court
    ruled on Plaintiffs’ motion for injunctive relief, the State
    moved to dismiss under Federal Rule of Civil Procedure
    12(b)(6).
    Subsequently, in September, the district court denied
    IBT’s motion to intervene, reasoning that: (1) the union
    could not intervene by right because it did not have a
    significantly protectable interest in the case; and (2) that the
    union could not permissively intervene because it would
    cause a delay and the State could protect any interests IBT
    may have. IBT appealed the denial of its motion to intervene.
    On October 18, 2016, the district court granted Plaintiffs’
    motion for a preliminary injunction on the equal protection
    claim, finding that § 1720.9 was not likely to survive rational
    basis review.3 In December, the district court granted the
    State’s motion to dismiss Allied Concrete’s FAAAA claim,
    but denied the motion as to the equal protection claim. Allied
    Concrete appealed the dismissal of its FAAAA claim.
    Thereafter, Plaintiffs moved for summary judgment and
    requested that the temporary injunction be made permanent.
    The district court, holding that § 1720.9 violated the Equal
    Protection Clause, permanently enjoined the statute’s
    3
    The State appealed the preliminary injunction, but the subsequent
    entry of the permanent injunction mooted that appeal.
    12        ALLIED CONCRETE AND SUPPLY V. IBT
    application and enforcement. First, the district court defined
    the classification in § 1720.9 as treating “ready-mixed
    concrete drivers differently than other materials drivers.”
    And, although the district court credited the State’s evidence
    as to the differences between ready-mix drivers and drivers
    of other materials, it concluded – without explanation – that
    those differences were immaterial because “all that matters
    for inclusion in the [prevailing wage law] is whether or not
    drivers are hauling and delivering construction materials to
    public works sites.” Thus, the district court concluded that
    “in all respects relevant to the [prevailing wage law], ready-
    mixed concrete drivers and other materials drivers are
    similarly situated.” Recognizing that the State’s interests
    may be legitimate, the district court nevertheless struck down
    the statute because the classification was “arbitrary” and not
    rationally related to any of the interests. The State appealed.
    STANDARD OF REVIEW
    We review de novo grants of summary judgment and
    dismissals. First Resort, Inc. v. Herrera, 
    860 F.3d 1263
    ,
    1271 (9th Cir. 2017), cert. denied, 
    138 S. Ct. 2709
    (2018); Ah
    Quin v. Cty. of Kauai Dep’t of Transp., 
    733 F.3d 267
    , 270
    (9th Cir. 2013).
    We consider de novo whether a motion to intervene of
    right should have been granted, Canatella v. California,
    
    404 F.3d 1106
    , 1112 (9th Cir. 2005), and, if necessary,
    review for abuse of discretion a denial of permissive
    intervention, 
    id. at 1117.
               ALLIED CONCRETE AND SUPPLY V. IBT                 13
    DISCUSSION
    1.     Equal Protection
    The parties agree that the rational basis test applies.
    Therefore, § 1720.9 “cannot run afoul of the Equal Protection
    Clause if there is a rational relationship between the disparity
    of treatment and some legitimate governmental purpose.”
    Heller v. Doe, 
    509 U.S. 312
    , 320 (1993). Non-suspect
    classifications are
    constitutionally valid if there is a plausible
    policy reason for the classification, the
    legislative facts on which the classification is
    apparently based rationally may have been
    considered to be true by the governmental
    decisionmaker, and the relationship of the
    classification to its goal is not so attenuated as
    to render the distinction arbitrary or irrational.
    Armour v. City of Indianapolis, 
    566 U.S. 673
    , 681 (2012)
    (internal quotation marks omitted); see also Johnson v.
    Rancho Santiago Cmty. Coll. Dist., 
    623 F.3d 1011
    , 1031 (9th
    Cir. 2010) (“[A] state action need not actually further a
    legitimate interest; it is enough that the governing body
    ‘could have rationally decided that’ the action would further
    that interest.” (quoting Minnesota v. Clover Leaf Creamery
    Co., 
    449 U.S. 456
    , 466 (1981))). “Further, because the
    classification is presumed constitutional, the burden is on the
    [party] attacking the legislative arrangement to negative every
    conceivable basis which might support it.” 
    Armour, 566 U.S. at 681
    (internal quotation marks omitted); see also Clover
    Leaf Creamery 
    Co., 449 U.S. at 464
    (“[P]arties challenging
    legislation under the Equal Protection Clause . . . cannot
    14           ALLIED CONCRETE AND SUPPLY V. IBT
    prevail so long as it is evident from all the considerations
    presented to [the legislature], and those of which we may take
    judicial notice, that the question is at least debatable.”
    (second alteration in original ) (internal quotation marks and
    citations omitted)); Vance v. Bradley, 
    440 U.S. 93
    , 111
    (1979) (“[T]hose challenging the legislative judgment must
    convince the court that the legislative facts on which the
    classification is apparently based could not reasonably be
    conceived to be true by the governmental decisionmaker.”).
    We disagree with the district court’s conclusion that the
    differences between ready-mix drivers and other delivery
    drivers is immaterial for the purposes of the prevailing wage
    law. As mentioned above, the California Supreme Court has
    stated that prevailing wage laws further goals such as:
    (1) generally protecting employees on public works projects,
    (2) benefitting the public through the superior efficiency of
    well-paid employees, and (3) permitting union contractors to
    compete with nonunion contractors. See 
    Lusardi, 824 P.2d at 649
    . The legislature could have rationally concluded that
    extending the prevailing wage law to ready-mix drivers ahead
    of other drivers would further these respective goals because
    ready-mix drivers: (1) are more integrated into the
    construction process than other materials drivers and should
    be paid accordingly; (2) are more skilled than other drivers
    and provide a material that is more important to public works
    projects than other materials such that paying the prevailing
    wage will attract superior drivers and improve public works;
    and (3) are more likely to be unionized and, therefore,
    vulnerable to underbidding.4 Plaintiffs have not met their
    4
    Each of these justifications is alone sufficient to survive the rational
    basis test. The State and IBT present us with several other potential
    ALLIED CONCRETE AND SUPPLY V. IBT                            15
    high burden of convincing us that these legislative facts
    “could not reasonably be conceived to be true by the
    governmental decisionmaker.” 
    Bradley, 440 U.S. at 111
    .
    The legislative facts are at least debatable and the
    classification rationally related to furthering the purposes of
    the prevailing wage law; as such, the statute survives the
    rational basis test.5 See FCC v. Beach Commc’ns, Inc.,
    
    508 U.S. 307
    , 320 (1993).
    A. Benefit Employees on Public Works Projects
    First, “[t]he overall purpose of the prevailing wage law
    . . . is to benefit and protect employees on public works
    projects.” 
    Lusardi, 824 P.2d at 649
    . In extending the
    prevailing wage law to benefit ready-mix drivers, the
    legislature could have rationally decided that the delivery of
    ready-mix to a public work is part of the “flow of
    construction” and should be compensated as such. Not only
    would this protect the ready-mix drivers, but if the legislature
    believed that the ready-mix drivers were actually more
    integrated in construction, the payment of prevailing wages
    justifications, but we need not reach those and offer no opinion on whether
    they would save the challenged statute.
    5
    Undergirding our analysis is the idea that the legislature is permitted
    to act incrementally in dealing with perceived problems. See City of New
    Orleans v. Dukes, 
    427 U.S. 297
    , 303 (1976) (per curiam) (“Legislatures
    may implement their program step by step in such economic areas,
    adopting regulations that only partially ameliorate a perceived evil and
    deferring complete elimination of the evil to future regulations.” (citations
    omitted)); see also Ry. Express Agency v. New York, 
    336 U.S. 106
    , 110
    (1949) (“It is no requirement of equal protection that all evils of the same
    genus be eradicated or none at all.” (citing Cent. Lumber Co. v. South
    Dakota, 
    226 U.S. 157
    , 160 (1912))).
    16        ALLIED CONCRETE AND SUPPLY V. IBT
    could increase efficiency in public works projects by
    attracting higher-skilled workers.
    Specifically, the legislature could have concluded that the
    ready-mix drivers are more integrated into the flow of
    construction because they bring a perishable commodity to a
    construction site, and, in certain instances, need to
    incorporate it immediately. During legislative hearings on
    the bill, an IBT representative testified:
    These workers are part of the construction
    process. That’s what’s different and unique
    about this from any other material coming to
    the job site. You can . . . it’s not dumping a
    load of lumber or a bag of nails or whatever
    and leaving. They bring this
    commodity—which is perishable—and [it]
    has to be incorporated immediately and the
    driver participates in the incorporation process
    with the workers. They are part of it. They
    move the truck. They operate levers and
    equipment that moves the concrete and the
    rate of flow in conjunction with the
    construction workers. They are integral to the
    process.
    At least some of the legislators were impressed by this
    perceived difference from other materials. As one legislator
    stated: “I will be supporting the bill today. I do get the
    distinction between the product we’re talking about and
    delivering in effect, dumping a delivery of pipes or paint or
    steel. This is a different commodity.”
    ALLIED CONCRETE AND SUPPLY V. IBT                 17
    The conclusion that ready-mix drivers are more integral
    to the public works projects than other drivers because of the
    material’s properties and the driver’s tasks is rational on its
    face. Therefore, it is up to Plaintiffs to negate this
    justification as inconceivable. Plaintiffs attempt this through
    three arguments. They first argue that the delivery of ready-
    mix is not any different than that of other materials. For
    example, one contractor stated that “[f]rom [his] perspective
    as a contractor, there is no meaningful difference between the
    delivery of ready-mixed concrete . . . and the delivery of any
    other construction material . . . . Approximately 95% of the
    time, all of the [ready-mix] goes into a single pump that [his]
    employees than [sic] use to place the concrete.” While this
    argument raises a factual dispute with the testimony from
    IBT’s witness, quoted above, it does not significantly weigh
    against the legislature conceivably concluding that ready-mix
    drivers are more important to the construction process based
    on the properties of the materials, the uniqueness of the
    trucks, and the driver’s responsibilities upon arrival. The
    legislature, where there is no suspect class at issue, has wide
    leeway to consider different, and potentially competing, facts.
    See 
    Armour, 566 U.S. at 685
    (“[T]he Constitution does not
    require the [government] to draw the perfect line nor even to
    draw a line superior to some other line it might have drawn.
    It requires only that the line actually drawn be a rational
    line.”).
    Next, Plaintiffs argue that the legislature could not
    rationally conclude that ready-mix drivers were more
    integrated into the flow of construction than other drivers
    because the Director had previously found that the drivers
    were not always entitled to prevailing wages under the pre-
    § 1720.9 test. In A&A Ready Mix Concrete, the Director
    concluded that ready-mix drivers delivering the material, but
    18         ALLIED CONCRETE AND SUPPLY V. IBT
    not performing on-site construction work, were not part of the
    flow of construction. Plaintiffs argue that this administrative
    ruling undercuts any factual basis for the legislature to have
    decided otherwise. This argument fails for several reasons.
    First and foremost, the legislature is not bound to accept the
    findings of an administrative agency. Legislatures frequently
    change laws in response to administrative (or judicial)
    decisions with which they do not agree. As such, this
    decision of the agency is of little relevance to our analysis.
    Finally, Plaintiffs argue that extending the prevailing
    wage to all ready-mix drivers is overbroad because not all
    ready-mix drivers are sufficiently integral to the flow of
    construction. For example, Plaintiffs contend that not all
    drivers incorporate the ready-mix, and that even if they do,
    this would not necessarily support higher wages for the drive
    time. Again, Plaintiffs question where the legislature drew
    the line. But, for the reasons stated above, the legislature
    could have rationally concluded that ready-mix drivers were
    more integral to public works than other drivers and that the
    drive time – when the driver controls the rate of rotation and
    the amount of water in the drum – is part of the construction.
    B. Ensure Superior Projects
    Second, another goal of the prevailing wage law is to
    “benefit the public through the superior efficiency of well-
    paid employees.” 
    Lusardi, 824 P.2d at 649
    . The State offers
    that the legislature may have decided that the unique aspects
    of a ready-mix driver’s job, and the nature of ready-mix as a
    material for structural projects such as buildings, bridges, and
    dams (as opposed to roads), make the quality of ready-mix
    drivers more important to public works projects than other
    drivers. This argument rests on two premises that Plaintiffs
    ALLIED CONCRETE AND SUPPLY V. IBT                 19
    challenge:     (1) that ready-mix drivers have unique
    responsibilities that are more important to the success of a
    public works project; and (2) that ready-mix is more often
    used in “structural” projects.
    As to the first premise, there are clear differences between
    ready-mix drivers and other materials drivers relevant to the
    equal protection analysis. Ready-mix drivers use specialized
    trucks, with a rotating mixing drum, whereas asphalt drivers
    use dump trucks. Ready-mix drivers can change the
    consistency of their load by adding water to the mixture or
    altering the speed of rotation of the drum. Further, ready-mix
    drivers require more training than asphalt drivers and must
    carry a different driver’s license endorsement than asphalt
    drivers. It is conceivable that the legislature could have
    rationally believed these facts, determined that ready-mix
    drivers need more skills than other drivers, and concluded
    that prevailing wages would attract higher-quality workers.
    Plaintiffs argue that there is no meaningful difference
    between the delivery of ready-mix and other materials. For
    example, some contractors declare that ready-mix and asphalt
    drivers both merely drop the material where the contractors’
    employees tell the driver to dump it. Plaintiffs further argue
    that both ready-mix and asphalt have a limited duration in
    which they must be delivered. Finally, Plaintiffs argue that
    even though the ready-mix driver has the ability to add water
    to the mixture, he or she does not have discretion to do so.
    Instead, the drivers simply follow instructions from
    somebody else.
    Nonetheless, the different licensing requirements and the
    ability of ready-mix drivers to control the cement in their
    trucks are rational grounds for distinguishing between them
    20         ALLIED CONCRETE AND SUPPLY V. IBT
    and other drivers. Further, even if ready-mix drivers do not
    have discretion to add water to the mixture, or change the
    speed of the rotating drum, they still must control these
    variables during the drive, which is not true for drivers of
    typical dump trucks.          Carefully following important
    instructions is itself a valuable skill.
    As to the second premise, although it is true that many
    projects could interchange the materials depending on cost,
    there is evidence that ready-mix is used for structural support,
    such as walls or footings, more often than other materials. By
    contrast, asphalt cannot be used as a structural material, and
    is most often used for paving. It is easy to imagine a
    legislator concluding that a failed structure, such as a dam or
    bridge, is worse than a poorly-paved road. Therefore, the
    legislature could have rationally concluded that ready-mix is
    more important to sensitive public works and that the drivers
    must be more skilled to ensure the integrity of the material
    they deliver.
    Again, Plaintiffs cannot negate this justification. Aside
    from arguing that ready-mix drivers are not any different than
    other drivers, Plaintiffs also contend that concerns about
    structural projects do not survive constitutional scrutiny
    because not all public works are structural projects. But this
    argument cannot carry the day under rational basis review.
    See 
    Heller, 509 U.S. at 321
    (“[C]ourts are compelled under
    rational-basis review to accept a legislature’s generalizations
    even when there is an imperfect fit between means and
    ends.”).
    ALLIED CONCRETE AND SUPPLY V. IBT                 21
    C. Protect From Underbidding
    Third, another purpose of the prevailing wage law is “to
    permit union contractors to compete with nonunion
    contractors.” 
    Lusardi, 824 P.2d at 649
    . The district court,
    citing Merrifield v. Lockyer, 
    547 F.3d 978
    , 991 n.15 (9th Cir.
    2008), however, rejected this argument: “[L]egislation
    passed for the sole purpose of protecting union employers
    from non-union competition will not pass constitutional
    muster.” As we further explain below, Merrifield does not
    support the district court’s conclusion. True, bare economic
    protectionism is not a valid justification for discriminatory
    treatment, but the interest in protecting union workers from
    underbidding conceivably is about ensuring a certain standard
    of worker – and avoiding a race to the bottom – rather than
    granting favors to politically important actors. See O.G.
    
    Sansone, 127 Cal. Rptr. at 813
    –14 (describing the
    maintenance of competition between union and non-union
    workers as one of the purposes of the federal prevailing wage
    law); see also Indep. Roofing Contractors v. Dep’t of Indus.
    Relations, 
    28 Cal. Rptr. 2d 550
    , 557 (Ct. App. 1994)
    (recognizing the “declared public policy of [California] in
    favor of collective bargaining”).
    The State argues that the legislature could have rationally
    concluded that ready-mix drivers were more vulnerable
    to underbidding than other drivers because a higher
    percentage of ready-mix drivers are union workers. An IBT
    representative estimates that 95% of ready-mix drivers in the
    San Francisco area are working under collective bargaining
    agreements (“CBAs”), whereas “IBT has only one or two
    [CBAs] with contractors who are also commercial suppliers
    covering asphalt delivery in California.” If unionized ready-
    mix drivers were underbid by a non-union supplier, 95% of
    22         ALLIED CONCRETE AND SUPPLY V. IBT
    drivers in San Francisco would be ineligible for the job.
    Therefore, it seems reasonable that the legislature could have
    rationally believed that underbidding in the ready-mix market
    is more harmful and that § 1720.9 would further the interest
    in preventing underbidding.
    Plaintiffs respond that underbidding by non-union drivers
    may be a problem, regardless of the material carried, and that
    the state has not provided any evidence that the disparity
    between union and non-union rates is greater for ready-mix
    drivers than other drivers. These arguments miss the mark.
    Just because underbidding may be an issue for drivers of
    other materials does not mean that the legislature could not
    have rationally concluded that the problem was more acute
    for ready-mix drivers due to their higher unionization rates.
    Second, the state is not required to produce empirical
    evidence to support the statute; it is Plaintiffs’ burden is to
    negate conceivable justifications. See Beach 
    Commc’ns, 508 U.S. at 315
    (“[A] legislative choice . . . may be based on
    rational speculation unsupported by evidence or empirical
    data.”).
    D. Not Bare Economic Protectionism
    Plaintiffs contend that they have refuted all of the State’s
    justifications and that the only explanation for § 1720.9 is that
    the legislature wanted to protect the suppliers of other
    materials from competition. Plaintiffs, however, have put
    forward no evidence that the legislature engaged in improper
    favoritism, and the Ninth Circuit cases that Plaintiffs cite are
    inapposite.
    Plaintiffs rely on Merrifield for the premise that
    “economic protectionism for the sake of economic
    ALLIED CONCRETE AND SUPPLY V. IBT                 23
    protectionism is irrational with respect to determining if a
    classification survives rational basis 
    review.” 547 F.3d at 991
    n.15. Merrifield, however, presented a unique set of facts
    distinguishable from those here. In Merrifield, a pest-control
    professional who did not use pesticides challenged, on due
    process grounds, the application of California’s overall
    pesticide licensing scheme to him and other non-pesticide
    users. 
    Id. at 987.
    We rejected the due process claim,
    reasoning that the state had a public safety interest in
    “requiring persons who do not use pesticides to learn about
    the risks of pesticides . . . because persons like [plaintiff]
    work in environments where they may be exposed to
    pesticides that have been applied previously and left on-site.”
    
    Id. at 988.
    The plaintiff in Merrifield also challenged, on equal
    protection grounds, the exemptions in the licensing scheme,
    which exempted pest-control professionals who dealt with
    bats, raccoons, skunks, and squirrels and did not use
    pesticides from the licensing requirement, but did not
    similarly exempt professionals who worked with mice, rats,
    or pigeons. 
    Id. at 981–82.
    Applying the rational basis test,
    we struck down these selective exemptions. 
    Id. at 991.
    We
    reasoned that the classification in the licensing scheme did
    not survive constitutional muster because it contradicted the
    very interest the State proffered to defeat the due process
    claim – public health concerns about exposure to pesticide.
    See 
    id. (“We cannot
    simultaneously uphold the licensing
    requirement under due process based on one rationale and
    then uphold [plaintiff’s] exclusion from the exemption based
    on a completely contradictory rationale.”). The rationale was
    contradictory because those pest-control operators who
    worked with bats, rats, racoons, skunks, and squirrels were
    more at risk of being exposed to pesticides even if they did
    24         ALLIED CONCRETE AND SUPPLY V. IBT
    not themselves use pesticides than similarly-situated
    operators who dealt with more-common pests like mice or
    rats. 
    Id. at 991.
    Plaintiffs also rely on Fowler Packing Co. v. Lanier,
    
    844 F.3d 809
    , 816 (9th Cir. 2016). In Fowler Packing, we
    concluded, on a motion to dismiss, that plaintiffs had pleaded
    an equal protection claim because the only conceivable
    explanation for a portion of the challenged legislation was the
    need to win the political support of a particular labor union.
    
    Id. at 816.
    The legislation at issue in Fowler Packing
    “created a ‘safe harbor’ that gave employers an affirmative
    defense against” certain minimum wage claims. 
    Id. at 811.
    However, there were carve outs from the safe harbor that only
    benefitted the labor union which had ongoing suits against
    employers. 
    Id. at 815.
    These carve outs came in the form of
    cut-off dates that corresponded almost exactly to the filing
    dates of the labor union’s cases against certain employers. 
    Id. Accepting the
    plaintiffs’ allegations as true, we held that they
    had alleged enough to survive a motion to dismiss.
    Both cases are easily distinguishable from the situation
    here. Unlike in Merrifield, there is no suggestion that
    classifying ready-mix drivers as distinct from other drivers
    actually contradicts the purposes of the prevailing wage law.
    Similarly, there is no specific evidence like the cut-off dates
    in Fowler Packing that clearly suggests improper favoritism.
    Plus, the burden on Plaintiffs here to come forward with
    evidence that negates every conceivable basis for the law is
    much higher than that of the Fowler Packing plaintiffs
    opposing a motion to dismiss.
    Finally, Plaintiffs emphasize the fact that asphalt was
    dropped from an earlier version of § 1720.9 as a sign that the
    ALLIED CONCRETE AND SUPPLY V. IBT                 25
    law’s only justification is to protect ready-mix suppliers’
    competitors. Without more, the fact that the legislature once
    considered including asphalt in the legislation is not evidence
    of improper motive. In fact, considering asphalt, but then
    removing it after holding hearings, could just as easily bolster
    the conclusion that after reviewing the facts, the legislature
    reached an informed judgment.
    Because Plaintiffs have not negated every conceivable
    justification for § 1720.9, we conclude that the statute passes
    the rational basis test and does not violate the Equal
    Protection Clause.
    2. Intervention
    In a separate appeal, IBT challenges the district court’s
    denial of its motion for leave to intervene as of right or by
    permission. During oral argument, we raised the issue of
    whether IBT’s appeal would be moot if we reversed the
    district court on the equal protection claim. IBT argued that
    its appeal would not be moot because Plaintiffs could still
    move for rehearing en banc or petition for a writ of certiorari
    with the Supreme Court.
    We are not aware of any decision from our Circuit that
    addresses whether a potential petition for rehearing or
    certiorari keeps a case alive for the purposes of appealing a
    motion to intervene. The typical rule is that “[a]n appeal is
    moot if there exists no present controversy as to which
    effective relief can be granted.” W. Coast Seafood
    Processors Ass’n v. Natural Res. Def. Council, Inc., 
    643 F.3d 701
    , 704 (9th Cir. 2011) (internal quotation marks omitted);
    see also United States v. Ford, 
    650 F.2d 1141
    , 1143 (9th Cir.
    1981). On the other hand, where the district court has entered
    26           ALLIED CONCRETE AND SUPPLY V. IBT
    judgment, but a party has appealed some aspect of the case,
    an appeal of the motion to intervene is not moot. See
    
    Canatella, 404 F.3d at 1109
    n.1. We think that the situation
    here is more similar to Canatella than West Coast Seafood or
    Ford. In both West Coast Seafood and Ford, the underlying
    litigation had concluded; here, as IBT points out, Plaintiffs
    may pursue their case by filing a petition for rehearing or
    rehearing en banc here, or by petitioning the Supreme Court
    for a writ of certiorari.6 We therefore hold that IBT’s appeal
    is not moot in light of our reversal and will reach the district
    court’s decision denying intervention. See U.S. Postal Serv.
    v. Brennan, 
    579 F.2d 188
    , 190 n.1 (2d Cir. 1978) (“Because
    application for rehearing has been filed and the time to
    petition for certiorari has not expired, the case has not
    reached final judgment, and the issue of intervention is not
    moot.” (citation omitted)).
    To determine whether a party may intervene as of right,
    we employ a four-part test: (1) the motion must be timely;
    (2) the applicant must claim a “significantly protectable
    interest” in the action; (3) the disposition of the action must
    as a practical matter impair or impede the applicant’s ability
    to protect that interest; and (4) the applicant’s interest may be
    inadequately represented by the other parties. Wilderness
    Soc’y v. U.S. Forest Serv., 
    630 F.3d 1173
    , 1177 (9th Cir.
    2011) (en banc).
    We have previously considered a motion for IBT to
    intervene on the side of the State to defend California’s
    prevailing wage law.      See Californians for Safe &
    6
    Plaintiffs have already indicated that they intend to file a petition for
    rehearing en banc challenging this Circuit’s FAAAA preemption
    precedent.
    ALLIED CONCRETE AND SUPPLY V. IBT                 27
    Competitive Dump Truck Transp. v. Mendonca, 
    152 F.3d 1184
    , 1189–90 (9th Cir. 1998). Because the facts of
    Mendonca are almost identical to this case, we follow its
    reasoning and reverse the district court’s denial of IBT’s
    motion to intervene.
    In Mendonca, “public works contractors who provide[d]
    transportation-related services on publicly-funded projects”
    challenged California’s prevailing wage laws, arguing that the
    FAAAA preempted the state law. 
    Id. at 1185–86.
    We
    affirmed the district court’s grant of IBT’s motion to
    intervene, reasoning that: (1) IBT’s motion was timely;
    (2) IBT’s members had a “‘significant interest’ in receiving
    the prevailing wage for their services as opposed to a
    substandard wage”; (3) “IBT’s members’ right to receive the
    prevailing wage” would have been impaired had plaintiffs
    prevailed; and (4) IBT demonstrated that the State’s
    representation of its interests may have been inadequate
    “because the employment interests of IBT’s members were
    potentially more narrow and parochial than the interests of
    the public at large.” 
    Id. at 1189–90.
    The district court attempted to distinguish Mendonca by
    emphasizing that we used the phrase “receive the prevailing
    wage” in Mendonca. 
    Id. at 1190
    (emphasis added). By
    emphasizing the word “receive,” the district court assumed
    that the IBT members in Mendonca would not have been paid
    the prevailing wage if the statute were struck down. Here, on
    the other hand, the district court relied on the fact that many
    IBT members already received the prevailing wage pursuant
    to CBAs – regardless of the prevailing wage law. In other
    words, the district court concluded that the IBT members
    “would merely lose § 1720.9 as a statutory backstop to their
    [CBAs].”
    28          ALLIED CONCRETE AND SUPPLY V. IBT
    Mendonca is not susceptible to the district court’s narrow
    reading. Moreover, we are not convinced that the distinction
    between receiving a prevailing wage pursuant to statute and
    maintaining the statutory right to receive a wage is a
    meaningful one for purposes of assessing standing to
    intervene. For one, Mendonca makes no mention of
    distinguishing IBT members by whether they actually
    received the prevailing wage or not, and there is no
    discussion about whether certain IBT members were already
    paid the prevailing wage under CBAs. It is entirely possible
    that the members at issue in Mendonca were subject to CBAs.
    For another, the district court just as easily could have
    emphasized the word “right” in the statement “[if plaintiffs]
    prevailed, it would have clearly impaired IBT’s members’
    right to receive the prevailing wage” and come to the
    opposite conclusion. 
    Id. at 1190
    . In any event, we do not see
    a significant difference either way, even if the Mendonca
    intervenors were not subject to CBAs. For example,
    receiving a prevailing wage in the absence of a CBA might
    technically be different than receiving it pursuant to a
    contract, but for the purposes of a significantly protectable
    interest, we think they are indistinguishable. Even if all of
    IBT’s members are subject to CBAs7 that pay them the
    prevailing wage, a statutory right to that wage is still
    important and not at all speculative. CBAs are not
    permanent, and re-negotiating about wages from a statutory
    floor is certainly a much better bargaining position than
    starting from scratch. Maintaining the statutory floor is a
    significant, protectable interest for IBT.
    7
    IBT alleges that there are times when some of its members are not
    protected by CBAs.
    ALLIED CONCRETE AND SUPPLY V. IBT                         29
    Likewise, Mendonca guides us on the other three
    elements of intervention by right. First, there is no dispute
    that IBT’s motion was timely. Next, because IBT has an
    interest in the right to a prevailing wage, the district court
    invalidating the law clearly impaired that interest. 
    Id. And, finally,
    IBT’s interests are potentially more narrow than the
    public’s at large, and the State’s representation of those
    interests “may have been inadequate.” 
    Id. (emphasis added).
    As such, we see no reason to depart from Mendonca and
    therefore conclude that the district court erred in denying
    IBT’s motion to intervene as a matter of right.8
    3. Preemption
    The district court correctly dismissed Plaintiffs’ FAAAA
    preemption claim. The prevailing wage law “is not ‘related
    to’ . . . prices, routes, and services within the meaning of the
    [FAAAA’s] preemption clause.” 
    Mendonca, 152 F.3d at 1189
    ; see also Dilts v. Penske Logistics, LLC, 
    769 F.3d 637
    ,
    647–48 (9th Cir. 2014) (reaffirming Mendonca). Thus,
    preemption does not apply.
    CONCLUSION
    The district court’s summary judgment in favor of
    Plaintiffs’ equal protection claim, and its denial of IBT’s
    motion for leave to intervene as of right are REVERSED.
    We AFFIRM the district court’s dismissal of Plaintiffs’
    8
    Because we uphold IBT’s intervention as a matter of right, we need
    not reach its alternative motion for permissive intervention.
    30        ALLIED CONCRETE AND SUPPLY V. IBT
    FAAAA preemption claim. We REMAND to the district
    court to enter judgment consistent with this opinion.
    The State Defendants and IBT shall recover their costs on
    appeal from Plaintiffs.