No Wetlands Landfill Expansion v. County of Marin CA1/4 ( 2014 )


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  • Filed 12/12/14 No Wetlands Landfill Expansion v. County of Marin CA1/4
    NOT TO BE PUBLISHED IN OFFICIAL REPORTS
    California Rules of Court, rule 8.1115(a), prohibits courts and parties from citing or relying on opinions not certified for
    publication or ordered published, except as specified by rule 8.1115(b). This opinion has not been certified for publication
    or ordered published for purposes of rule 8.1115.
    IN THE COURT OF APPEAL OF THE STATE OF CALIFORNIA
    FIRST APPELLATE DISTRICT
    DIVISION FOUR
    NO WETLANDS LANDFILL
    EXPANSION et al.,
    Plaintiffs and Respondents,
    v.                                                                   A137459
    COUNTY OF MARIN et al.,
    (Marin County
    Defendants and Appellants;                                  Super. Ct. No. CIV 090198)
    REDWOOD LANDFILL, INC.,
    Real Party in Interest and Appellant.
    Three groups petitioned for a writ of mandate under the California Environmental
    Quality Act (CEQA)1 challenging the certification of an environmental impact report
    (EIR) issued on a proposed expansion of the Redwood Landfill, a facility that handles
    most of Marin County’s solid waste. The trial court ruled partly in favor of each side,
    and they both appealed. We conclude that the EIR adequately informed the public about
    the potential significant environmental effects of the proposed expansion. We therefore
    affirm in part and reverse in part and remand to the trial court with directions to enter an
    order denying the petition.
    1
    CEQA is set forth in Public Resources Code section 21000 et sequitur. Further
    statutory references are to the Public Resources Code unless otherwise specified.
    1
    I.
    FACTUAL AND PROCEDURAL
    BACKGROUND
    This is the second time we have been asked to weigh in on the validity of the
    certification of the EIR permitting the expansion of the Redwood Landfill. In 2012, we
    concluded that the certification was not appealable to the Marin Board of Supervisors,
    and we remanded the case to the trial court to resolve any challenges to the adequacy of
    the EIR. (No Wetlands Landfill Expansion v. County of Marin (2012) 
    204 Cal.App.4th 573
    , 580, 586-587 (No Wetlands I).) In this appeal, we consider the trial court’s rulings
    on those challenges.
    Much of the factual background was discussed in No Wetlands I, and we briefly
    summarize it here. Redwood Landfill, Inc. operates the Redwood Landfill on a 420-acre
    site near the Petaluma River. The landfill “began receiving waste in 1958,” and it accepts
    most of Marin County’s solid waste. It has a solid-waste-facilities permit issued under
    the California Integrated Waste Management Act of 1989 (the permit). (§ 40000 et seq.)
    In 1992, appellant Marin County Environmental Health Services (Marin EHS) was
    certified to be the local enforcement agency by the California Department of Resources
    Recycling and Recovery (CalRecycle). (§§ 40110, 43200 et seq.)
    In 1990, Redwood applied to revise the permit to allow it to expand, increase the
    amount of waste it could accept, and change its operations, environmental controls, and
    facility infrastructure. An EIR was prepared (the 1994 EIR), and a revised permit was
    issued in 1995. Although a copy of the 1994 EIR is not included in the administrative
    record, it was incorporated by reference and summarized in the EIR giving rise to this
    appeal.2
    In March 1998, Redwood again applied to revise the permit to allow it to expand
    its capacity and change some operations. As the public agency with the principal
    responsibility for considering the application, Marin EHS assumed the role of lead
    2
    On July 24, 2013, we granted Redwood’s request for judicial notice of portions of the
    1994 EIR.
    2
    agency under CEQA. (Guidelines, § 15367.)3 It determined that a new EIR was required
    since the 1995 EIR did not address all of the proposed changes. (Guidelines, § 15162,
    subd. (a).) This new EIR was prepared, and it recommended a mitigated alternative as
    the environmentally superior alternative. The mitigated alternative was adopted. The
    Marin County Planning Commission reviewed the EIR and recommended to Marin EHS
    that it be certified. In June 2008, Marin EHS certified the EIR.4
    In October 2008, Marin EHS deemed the application complete and found it to be
    consistent with applicable state standards. (§ 44010.) CalRecycle concurred in this
    determination after a public hearing. (§ 44009.) The revised permit was then issued by
    Marin EHS in December 2008. (§ 44014, subd. (a).)
    The following month, the instant lawsuit, a petition for a writ of mandate, was
    filed by three groups to challenge the permit. These groups included No Wetlands
    Landfill Expansion (an association of local residents); Sustainability, Parks, Recycling
    and Wildlife Legal Defense Fund (an environmental organization); and Northern
    California Recycling Association (another environmental organization).5 (Code Civ.
    Proc., §§ 1085, 1094.5.) We shall refer collectively to these groups as the landfill
    opponents. They sued Marin County, the Marin County Board of Supervisors, and
    several Marin County agencies including Marin EHS and one of its officers. We shall
    refer collectively to the defendants as the Marin County entities.
    3
    “Guidelines” refers to the Guidelines for Implementation of CEQA, which are found in
    California Code of Regulations, title 14, section 15000 et sequitur. All subsequent
    regulatory citations to the Guidelines are to title 14 of the Code of Regulations.
    4
    Public hearings were held on April 28 and May 5, 2008, regarding the Final EIR. A
    new report titled Redwood Landfill Final Environmental Impact Report, Second
    Amendment was then prepared to respond to issues raised at those hearings, as well as to
    incorporate other changes to the EIR. We sometimes refer generally to “the EIR,” which
    encompasses various documents in the administrative record.
    5
    The current role of the Recycling Association in this litigation is unclear, as the group
    does not appear on the notice of appeal and is not listed on respondents’ certificate of
    interested entities or persons.
    3
    In October 2010, the trial court granted the landfill opponents’ petition based on
    their argument that they should have been allowed to appeal the EIR’s certification to the
    Marin County Board of Supervisors. We reversed. (Wetlands I, supra, 204 Cal.App.4th
    at pp. 586-587.) On remand, the trial court ruled in December 2012 that the EIR was
    substantively flawed, and it again granted the landfill opponents’ petition. Redwood
    timely appealed, and Marin County filed a notice of joinder.6 The landfill opponents
    filed a timely cross-appeal.
    II.
    DISCUSSION
    A. An Overview of CEQA’s EIR Requirement.
    The Legislature intended CEQA to provide the fullest possible protection to the
    environment within the reasonable scope of the statutory scheme. (California Native
    Plant Society v. City of Santa Cruz (2009) 
    177 Cal.App.4th 957
    , 978.) The EIR is a
    mechanism “ ‘to force informed decision making and to expose the decision making
    process to public scrutiny.’ ” (Ibid.) Its purpose is to inform the public and government
    officials of the environmental consequences of decisions before they are made. (Citizens
    of Goleta Valley v. Board of Supervisors (1990) 
    52 Cal.3d 553
    , 564.) The EIR “ ‘is the
    heart of CEQA’ ” (Guidelines, § 15003, subd. (a)), and it protects both the environment
    and informed self-government. (Goleta Valley, at p. 564.)
    “[A] public agency is not required to favor environmental protection over other
    considerations, but it must disclose and carefully consider the environmental
    6
    Generally, a party may not simply file a notice of joinder but must file a notice of
    appeal in the trial court to perfect an appeal from an appealable order or judgment. (Cal.
    Rules of Court, rule 8.100(a)(1); cf. rule 8.200(a)(5) [party to appeal may join in
    appellate brief]; but see Rialto Citizens for Responsible Growth v. City of Rialto (2012)
    
    208 Cal.App.4th 899
    , 909 (Rialto Citizens) [city and its redevelopment agency “join[ed]”
    retail store’s appeal in CEQA case].) Because the joinder here was filed well within the
    time to appeal and without objection, we may and do construe it as a notice of appeal and
    treat the Marin County entities as appellants and cross-respondents, as they identify
    themselves in the appellate briefs signed by county counsel. (Rule 8.100(a)(2) [notice of
    appeal must be liberally construed and is sufficient if it identifies judgment or order
    appealed from].)
    4
    consequences of its actions, mitigate or avoid adverse environmental effects if feasible,
    explain the reasons for its actions, and afford the public and other affected agencies an
    opportunity to participate meaningfully in the environmental review process.” (Ballona
    Wetlands Land Trust v. City of Los Angeles (2011) 
    201 Cal.App.4th 455
    , 466-467
    (Ballona Wetlands).) An EIR must include a detailed statement summarizing (1) all of a
    project’s significant effects on the environment, (2) any unavoidable or irreversible
    significant effects on the environment, (3) mitigation measures, (4) alternatives to the
    proposed project, and (5) the growth-inducing impacts of the proposed project. (§ 21100,
    subd. (b).) All of these requirements, except the last, are implicated in this appeal.
    B. The Standards of Review.
    Our review of the administrative record for error in a CEQA case, as in other
    mandamus cases, is the same as the trial court’s. (Vineyard Area Citizens for Responsible
    Growth, Inc. v. City of Rancho Cordova (2007) 
    40 Cal.4th 412
    , 427 (Vineyard Area
    Citizens).) That is, we review the public agency’s action, not the trial court’s decision.
    (Ibid.) In reviewing the agency’s action, our inquiry shall extend “only to whether there
    was a prejudicial abuse of discretion.” (§ 21168.5.) An abuse of discretion may be
    established in one of two ways: (1) if the agency did not proceed in a manner required by
    law or (2) if its determination or decision was not supported by substantial evidence.
    (Ibid.) “Judicial review of these two types of error differs significantly.” (Vineyard Area
    Citizens, at p. 435.)
    We review de novo whether the agency used the correct procedures, and we
    scrupulously enforce all legislatively mandated CEQA requirements. (Vineyard Area
    Citizens, supra, 40 Cal.4th at p. 435.) “The failure to provide information required by
    CEQA in an EIR is a failure to proceed in a manner required by law. [Citation.] The
    failure to comply with CEQA’s procedural or information disclosure requirements is a
    prejudicial abuse of discretion if the decision makers or the public is deprived of
    information necessary to make a meaningful assessment of the environmental impacts.”
    (Ballona Wetlands, supra, 201 Cal.App.4th at p. 468.)
    5
    We accord greater deference, however, when we review the agency’s factual
    conclusions for substantial evidence. (Vineyard Area Citizens, 
    supra,
     40 Cal.4th at
    p. 435.) Substantial evidence “includes fact, a reasonable assumption predicated upon
    fact, or expert opinion supported by fact,” but it does not include “argument, speculation,
    unsubstantiated opinion or narrative, evidence that is clearly inaccurate or erroneous, or
    evidence of social or economic impacts that do not contribute to, or are not caused by,
    physical impacts on the environment.” (§ 21080, subd. (e)(1), (2).) Substantial evidence
    is defined by the Guidelines as “information that a fair argument can be made to support
    a conclusion, even though other conclusions might also be reached.” (Guidelines,
    § 15384, subd. (a).) In reviewing for substantial evidence, we may not set aside the
    approval of an EIR on the ground that a different conclusion would have been equally or
    more reasonable. (Vineyard Area Citizens, 
    supra,
     40 Cal.4th at p. 435.) Our job “ ‘is not
    to weigh conflicting evidence and determine who has the better argument.’ ” (Ibid.) We
    do not consider the correctness of an EIR’s conclusions but instead pass only upon
    whether it is supported by substantial evidence and is sufficient as an informative
    document. (Ballona Wetlands, supra, 201 Cal.App.4th at p. 468; Concerned Citizens of
    South Central L.A. v. Los Angeles Unified School Dist. (1994) 
    24 Cal.App.4th 826
    , 835-
    836 (Concerned Citizens).)
    “Technical perfection is not required” in an EIR, and we look “not for an
    exhaustive analysis but for adequacy, completeness and a good-faith effort at full
    disclosure.” (Rio Vista Farm Bureau Center v. County of Solano (1992) 
    5 Cal.App.4th 351
    , 368.) An EIR is presumed to have complied with the statute (§ 21167.3, subd. (b)),
    and the plaintiff challenging an EIR has the burden to prove otherwise. (Concerned
    Citizens, 
    supra,
     24 Cal.App.4th at p. 836.)
    With these general principles and the relevant standards of review in mind, we
    turn to the issues raised by the parties.
    6
    C. The EIR’s Discussion of a Nonspecific Alternative Off-Site Project Was
    Adequate.
    1. The 1994 EIR’s Discussion of a Possible Off-site Alternative.
    According to the 1994 EIR, a new landfill could not be developed on about two-
    thirds of Marin County because the land consists of urban centers, open-space preserves,
    wetlands, county conservation zones, or areas subject to 100-year flooding. The report
    discussed how the county had identified five possible alternative landfill sites in 1988 as
    part of a solid-waste management plan. The five sites all (1) were accessible to existing
    and adequate roads within Marin County, (2) measured more than 250 acres, (3) included
    canyon areas that were confined, with limited drainage basins, (4) had topographic
    features favorable to site grading and waste disposal, with slopes generally less than
    20 percent, (5) were situated away from permanent creeks or areas subject to flooding or
    high groundwater conditions, and (6) had low visibility, were compatible with adjacent
    land uses, and had low potential for negative public reaction. The 1994 EIR noted that
    any new alternative site would be required to comply with federal regulations.
    The 1994 EIR analyzed the five selected locations as possible alternatives to the
    expansion of the permit then under consideration, and it concluded that they would result
    in greater potential environmental harm.
    2. The Final EIR’s Description of an Off-site Alternative.
    Redwood did not re-analyze these five alternative locations in its EIR for the
    current permit expansion. Instead, the final EIR briefly summarized the 1994 EIR’s
    findings, and it again rejected these locations, reasoning that they were unlikely to
    substantially reduce or avoid the environmental impacts of the current permit expansion.
    The final EIR also took an approach that had not been taken in the 1994 EIR by
    analyzing a hypothetical off-site alternative.7 This hypothetical was an “unidentified
    landfill site” that would meet minimum criteria from a 1995 siting element for Marin
    7
    In addition, the final EIR analyzed four other alternatives that are not challenged by the
    landfill opponents.
    7
    County and its cities.8 Marin EHS explained that the purpose of the analysis was to
    evaluate whether it would be preferable to gain more landfill capacity by expanding the
    existing site or by establishing a new landfill somewhere else in the county, and that the
    EIR “need not specify a particular location . . . for an effective, though general,
    comparison.” In doing so, the EIR essentially recognized that any new landfill meeting
    the required criteria, regardless of its location, would result in significant environmental
    effects.
    According to the EIR, the first goal of the 1995 siting element was to assure 15
    years of disposal capacity for Marin County. The element also listed 10 criteria that
    needed to be considered for any new site. These criteria were that the site should (1) not
    be on an earthquake fault, (2) not be in a 100-year flood plain, (3) be at least five feet
    above the highest anticipated ground-water level, (4) be in a location authorized for a
    solid-waste facility under the applicable city or county general plan, (5) be compatible
    with land uses specified for adjacent property covered by different general plans, (6) be at
    least 5,000 or 10,000 feet away from any airport runway, depending on the type of
    aircrafts that use the runway, (7) comply with federal, state, and local laws, (8) not cause
    a net loss of wetlands, (9) not be where it could harm water quality, and (10) not be in a
    stream-conservation area.
    The EIR assumed that the hypothetical alternative “would be located in a remote
    upland area zoned for agriculture, with close proximity to the U.S. 101 corridor, and
    without incompatible adjacent land uses.” In describing the types of environmental
    impacts that could be expected, it mentioned that any alternative site would unavoidably
    impact views and the visual character of the selected land, impose greater construction-
    related impacts on air quality than the planned project, impact biological resources in an
    area zoned for agricultural use, alter the hydrology of the selected site, likely conflict
    with several policies in the agricultural element of Marin’s countywide plan, require
    8
    Under the California Integrated Waste Management Act, counties must prepare an
    integrated waste management plan containing several elements, including one for source
    reduction and recycling. (§§ 40900 et seq., 40901, 40912, 40950.)
    8
    public services and utilities where they are not likely currently provided, possibly impact
    recreational uses negatively, and possibly disturb cultural and mineral resources. Still,
    the EIR pointed out that the alternative site would provide environmental advantages
    because it would be required to satisfy applicable regulations requiring the landfill to be
    lined, and it would result in fewer mitigation measures than would be required by
    expanding the current permit.
    The EIR concluded that the effects on public health and safety as well as
    transportation and traffic would be about the same at the off-site alternative as those
    expected from the proposed project. But the off-site alternative was ultimately rejected
    because its environmental impacts were greater than those of the mitigated alternative
    that was eventually adopted.
    3. The EIR Sufficiently Analyzed an Off-site Alternative.
    The landfill opponents claim that by failing to identify a specific location for the
    off-site alternative, Marin EHS deprived the public of an opportunity to meaningfully
    comment on the alternative. They also claim that the EIR’s conclusion that the “off-site
    alternative is infeasible” was not supported by substantial evidence. We disagree with
    both contentions.
    One goal of CEQA is to identify both significant environmental effects of a
    proposed project and feasible alternatives that would avoid or substantially lessen those
    effects. (§ 21002.) To further that goal, an EIR must consider and analyze project
    alternatives that would reduce adverse environmental impacts. (§§ 21061, 21100,
    subd. (b)(4); In re Bay-Delta etc. (2008) 
    43 Cal.4th 1143
    , 1163.) The Guidelines provide
    that an EIR “shall describe a range of reasonable alternatives to the project, or to the
    location of the project, which would feasibly attain most of the basic objectives of the
    project but would avoid or substantially lessen any of the significant effects of the
    project, and evaluate the comparative merits of the alternatives.” (Guidelines, § 15126.6,
    subd. (a).) But the Guidelines specify that “[t]here is no ironclad rule governing the
    nature or scope of the alternatives to be discussed other than the rule of reason.” (Ibid.;
    see also In re Bay-Delta etc., at p. 1163.) The rule of reason “requires the EIR to set
    9
    forth only those alternatives necessary to permit a reasoned choice.” (Guidelines,
    § 15126.6, subd. (f).) “The EIR shall include sufficient information about each
    alternative to allow meaningful evaluation, analysis, and comparison with the proposed
    project.” (Guidelines, § 15126.6, subd. (d).)
    The parties’ dispute boils down to whether it was reasonable for the EIR to
    analyze an off-site alternative without specifying a particular location, other than
    referencing and summarizing the five locations discussed in the 1994 EIR. We conclude
    it was reasonable to do so under the circumstances. There is “no authority or rationale
    for an inflexible rule that the availability of other sites always must be considered or that
    it never need be considered. Situations differ; what is reasonable in one case may be
    unreasonable in another. It is necessary to examine the particular situation presented to
    determine whether the availability of other feasible sites must be considered in the EIR.”
    (Citizens of Goleta Valley v. Board of Supervisors (1988) 
    197 Cal.App.3d 1167
    , 1179.)
    We agree with Redwood and the Marin County entities that CEQA and the Guidelines do
    not invariably compel all EIRs to consider off-site locations because particular
    circumstances may render such a consideration reasonably unnecessary. (Mira Mar
    Mobile Community v. City of Oceanside (2004) 
    119 Cal.App.4th 477
    , 491 [CEQA does
    not expressly require a discussion of alternative project locations].)
    The EIR’s consideration of the hypothetical alternative location here was
    reasonable. The landfill opponents claim that Marin EHS “refused to provide an actual
    location, thus depriving the public of an opportunity to meaningfully comment on the off-
    site alternative,” apparently suggesting that Marin EHS was hiding information about a
    particular viable off-site location. But they direct us to no evidence supporting such a
    suggestion. (§ 21080, subd. (e)(1) [substantial evidence includes “reasonable
    assumption” based on fact].) Redwood and the Marin County entities explain that the
    nonspecific off-site alternative was evaluated “at a conceptual level for purposes of
    providing additional information.” This approach was taken because five specific sites
    had been considered and rejected in the 1994 EIR, and the siting element required any
    new site to be able to accept waste for 15 years and be suitable under the 10 criteria. We
    10
    conclude that Marin EHS sufficiently considered and analyzed a range of reasonable
    project alternatives that would reduce adverse environmental impacts. (§ 21061;
    Guidelines, § 15126.6, subd. (a).)
    The landfill opponents rely on San Joaquin Raptor/Wildlife Rescue Center v.
    County of Stanislaus (1994) 
    27 Cal.App.4th 713
    , but this reliance is misplaced. In San
    Joaquin Raptor, the development consisted of 633 single-family homes, a commercial
    area, a park, and a district office building and meeting hall, to be located on 154.24 acres
    north of an unincorporated community in Stanislaus County. (Id. at p. 718.) The EIR’s
    only discussion of a possible alternative site was a statement that there were “ ‘numerous
    alternative sites for the project, including existing incorporated cities, other
    unincorporated communities, and proposed new communities.’ ” (Id. at p. 736, italics
    added.) After acknowledging the availability of numerous alternative sites, the EIR
    failed to clearly identify any in particular, and it simply concluded that “[t]he impacts
    associated with this development would be much the same if implemented at alternative
    sites . . . .” (Ibid.) San Joaquin Raptor concluded that the EIR “did not adequately
    identify and analyze the feasibility of admittedly available alternative sites.” (Ibid.,
    italics added.) In contrast, here there are no identified available alternatives other than
    those discussed in the 1994 EIR. The options of siting a large new and legally compliant
    landfill to serve Marin County, where at least two-thirds of the county is inappropriate for
    such a facility, are fewer than the options of siting a community development in
    unincorporated Stanislaus County. Moreover, unlike the short, cursory summary of
    potential off-site alternatives in San Joaquin Raptor, the EIR here listed all the criteria for
    a new landfill and analyzed the serious environmental effects that such a new landfill—
    wherever it was located—would present. (Cf. ibid.) We conclude that the EIR’s analysis
    of the hypothetical alternative under the circumstances of this case does not warrant
    setting aside the EIR.
    We also reject the landfill opponents’ argument that there was insufficient
    evidence to support the EIR’s finding that an off-site alternative was infeasible. This
    contention is based on their argument that the EIR improperly failed to identify the
    11
    alternative’s specific location, an argument we already have rejected. This case is
    distinguishable from Center for Biological Diversity v. County of San Bernardino (2010)
    
    185 Cal.App.4th 866
    , upon which the landfill opponents rely. The EIR in that case
    analyzed the potential environmental effects of a proposed open-air facility for
    composting materials derived both from plants and human waste. (Id. at pp. 874-875.) It
    rejected an enclosed facility as uneconomical and impractical because it would cost
    anywhere from 28 to 41 times the cost of a conventional facility. (Id. at pp. 876-877.)
    These findings were based solely on an unsupported memorandum from an
    environmental-consulting firm, and the county failed to respond to information provided
    during the review process indicating that there were enclosed facilities operating in Los
    Angeles and Riverside Counties, as well as in other locations throughout the country.
    (Id. at pp. 876-877, 884.) The court concluded that the EIR was inadequate because the
    memorandum omitted vital information and there was no evidence that the alternative
    was technologically infeasible or impractical on account of additional costs. (Id. at
    pp. 883-885.) In contrast, the landfill opponents here do not challenge any specific
    finding about the off-site alternative, only that the EIR’s conclusions were speculative
    because no specific location was identified. Because it was reasonable under the
    circumstances to analyze a hypothetical location in addition to those considered in the
    1994 EIR, the EIR was not deficient for failing to identify a particular off-site alternative
    location.
    D. The EIR Did Not Improperly Defer Mitigation Measures to Address Potential
    Sea-level Rise and Groundwater Contamination.
    1. Summary of Applicable Law.
    As we have discussed, one of CEQA’s purposes is to help public agencies identify
    both significant environmental effects of proposed projects and feasible mitigation
    measures that would avoid or substantially lessen those effects. (§ 21002.) An agency
    should not approve a proposed project that will significantly affect the environment if
    there are feasible mitigation measures that would substantially reduce those
    environmental effects. (§§ 21002, 21002.1, subd. (b); Guidelines, § 15021, subd. (a)(2);
    12
    Ballona Wetlands, supra, 201 Cal.App.4th at p. 466.) CEQA thus mandates that an EIR
    include a detailed statement describing proposed mitigation measures. (§ 21100,
    subd. (b)(3); Guidelines, § 15126.4.) In general, formulating mitigation measures should
    not be deferred until some time in the future. (Guidelines, § 15126.4, subd. (a)(1)(B).)
    “However, measures may specify performance standards which would mitigate the
    significant effect of the project and which may be accomplished in more than one
    specified way.” (Ibid.)
    Although “[t]here is not a single, all-encompassing statement of the judge-made
    exception to the general rule prohibiting the deferral of the formulation of mitigation
    measures” (POET, LLC v. State Air Resources Bd. (2013) 
    218 Cal.App.4th 681
    , 735), we
    summarize the principles that apply here. “[W]hen, for practical reasons, mitigation
    measures cannot be fully formulated at the time of project approval, the lead agency may
    commit itself to devising them at a later time, provided the measures are required to
    ‘satisfy specific performance criteria articulated at the time of project approval.’ ”
    (Rialto Citizens, 
    supra,
     208 Cal.App.4th at p. 944, italics omitted.) Mitigation measures
    improperly defer environmental assessment where they rely on “tentative plans for future
    mitigation after completion of the CEQA process.” (Communities for a Better
    Environment v. City of Richmond (2010) 
    184 Cal.App.4th 70
    , 92 (CBE).) “An EIR is
    inadequate if ‘[t]he success or failure of mitigation efforts . . . may largely depend upon
    management plans that have not yet been formulated, and have not been subject to
    analysis and review with the EIR.’ [Citation.] ‘A study conducted after approval of a
    project will inevitably have a diminished influence on decisionmaking. Even if the study
    is subject to administrative approval, it is analogous to the sort of post hoc rationalization
    of agency actions that has been repeatedly condemned in decisions construing CEQA.’ ”
    (Ibid.) Where an EIR improperly defers analysis of mitigation measures, the approving
    agency abuses its discretion by failing to proceed as required by law. (Id. at pp. 89-90;
    § 21168.5.)
    Lead agencies have been allowed to defer formulating specific mitigation
    measures where they: “(1) undertook a complete analysis of the significance of the
    13
    environmental impact, (2) proposed potential mitigation measures early in the planning
    process, and (3) articulated specific performance criteria that would ensure that adequate
    mitigation measures were eventually implemented.” (CBE, supra, 184 Cal.App.4th at
    p. 95.)
    2. The EIR Did Not Improperly Defer Mitigation of Projected Sea-level Rise.
    a. Background
    Redwood Landfill “is located in flat, low-lying, drained marshlands,” and it “is
    surrounded by a complex network of natural and manmade surface water bodies
    including ditches, ponds, creeks, and sloughs.” It is bound on its northern and eastern
    sides by San Antonio Creek, which in turns flows to the Petaluma River and eventually
    into San Pablo Bay.
    The EIR lists several environmental impacts of the proposed project related to
    hydrology and water quality. One of them is potential flooding of areas proposed for
    “composting and co-composting operations” and relocated administration facilities,
    which will be located within a 100-year flood plain (identified as impact No. 3.5.6 in the
    “Redwood Landfill Solid Waste Facilities Permit Revision Mitigation Monitoring and
    Report Program,” dated November 17, 2008). To address this potential effect, the EIR
    contains four mitigation measures, one of which is challenged by the landfill opponents.
    Protecting the landfill from flooding is not a new concern. An earthen levee
    system that reportedly dates from the 1940s sits along the edge of San Antonio Creek.
    The levee system has been periodically raised and maintained. The first mitigation
    measure directed at preventing flooding (No. 3.5.6a) is meant to address flooding
    concerns identified in impact No. 3.5.6. It states that the current elevation for a 100-year
    flood is about six to seven feet above sea level, and it calls for raising the height of the
    exterior levee to nine feet above median sea level and increasing the width of the levee to
    10 feet, with completion by December 31, 2011. The landfill opponents do not challenge
    this mitigation measure.
    They also do not challenge two additional mitigation measures meant to ensure
    that levee improvements are designed properly. By way of background, Redwood had
    14
    planned for several years to raise the entire length of the levee to nine feet above mean
    sea level as part of the plans approved in connection with the 1994 EIR. In
    November 2006, construction was completed on a section of the levee raising it to
    9.5 feet above mean sea level. The following month, a 350-foot portion of the newly
    upgraded levee failed. According to Redwood, the failure did not result in any
    unauthorized flooding or discharge into San Antonio Creek. An engineering analysis
    concluded that the bay mud at the location could not support the weight of the
    reconstructed levee. A temporary repair was made, and the engineers recommended
    recalculating the strength and stability of the structure “using the correct, established
    factors and methods.”
    As part of the EIR process at issue here, it became clear that mitigation measures
    were necessary to ensure that the levee repair and future levee upgrades were adequately
    designed and constructed. The final EIR second amendment included two measures
    (Nos. 3.5.6b and 3.5.6c) aimed at studying the slope stability of levee upgrades to
    determine whether remedial action was necessary and to ensure that future upgrades were
    properly designed and constructed. Again, the landfill opponents do not challenge those
    two measures.
    But the landfill opponents do challenge mitigation measure No. 3.5.6d, which is
    aimed at protecting the landfill against future rises in sea levels caused by global
    warming. Sea-level rise and fluctuations in tides affect the Petaluma River, near the
    Redwood Landfill property. During the EIR process, Redwood acknowledged the
    possibility of having to raise the levee system even higher to account for settling and
    accumulating underlying bay mud and to account for sea-level rise due to climate
    15
    change.9 The Intergovernmental Panel on Climate Change estimated a rise in the global
    sea level of between 0.9 to 1.4 feet by the end of this century, and a more dramatic rise of
    up to 32.8 feet after the 21st century.10
    Mitigation measure No. 3.5.6d provides that before project approval Redwood
    “shall prepare and submit to [Marin EHS] and the San Francisco Bay Regional Water
    Quality Control Board a plan for long-term flood protection of the site. The plan will
    include a consideration of feasible options for achieving protection from the 100-year
    flood in the face of rising sea level[s] and increased flood frequency and intensity. The
    plan shall include selection of the preferred method or methods for achieving flood
    protection, and both a schedule and financial assurances for their implementation. The
    engineering basis for the plan shall be independently peer reviewed by a Registered
    Geotechnical Engineer prior to submittal for approval. The plan will be drafted and then
    updated every 5 years during the remaining operational life of the landfill and the
    postclosure maintenance period to ensure that it is current with the most recent and
    broadly-accepted predictions for flood levels, following consultation with the U.S.
    Geological Survey, the San Francisco Bay Conservation and Development Commission,
    and other monitoring agencies that track bay and ocean levels and that may provide
    estimates of mean sea level rise and areas subject to future inundation.” Adoption of all
    four measures was meant to ensure that potential flooding was reduced to a less-than-
    significant level.
    9
    Citing Ballona Wetlands, supra, 201 Cal.App.4th at pages 473 to 474, Redwood and the
    Marin County entities briefly contend that the EIR had no duty to analyze or mitigate the
    environment’s effect on the project (as opposed to the project’s effect on the
    environment). But Ballona Wetlands is distinguishable because, although the EIR may
    not specifically say so, future sea rise here presumably would not only impact the project
    but would also impact the environment by contaminating waterways. (Cf. Parker
    Shattuck Neighbors v. Berkeley City Council (2013) 
    222 Cal.App.4th 768
    , 782-785
    [questioning whether CEQA regulates environment’s effect on project, as opposed to
    project’s effect on environment].)
    10
    To be clear, the landfill is located miles from the ocean. The apparent concern is that
    as ocean levels rise, so too will San Pablo Bay and the waterways adjacent to the landfill
    that feed into the bay, all of which are “subject to tidal influence.”
    16
    As part of implementing mitigation measure No. 3.5.6d, Geosyntec consultants
    prepared a long-term flood-protection plan for Redwood dated October 16, 2008. The
    plan noted that “the study of climate change and its effects on local tidal fluctuation and
    runoff is a rapidly developing field,” and it stated that every five years the plan would be
    reevaluated and reissued to incorporate and address new information. The then-current
    proposed exterior levee design at the Redwood Landfill was “a 9+ ft minimum elevation
    above . . . the nationally referenced mean sea level . . . .” By contrast, the peak stage for
    a 100-year storm was calculated at 6.3 feet. The plan analyzed existing sea-level
    projections and concluded that nearby water was not expected to top the current levees.
    On the other hand, levee improvements would be needed after “about 2015 to 2030” in
    order to ensure two feet of space between projected river peak and the top of the levee.
    The plan stated that Redwood’s levees were expected to provide sufficient flood
    protection for the following five to 10 years, and exterior levees would then need to be
    enlarged to account for ongoing settlement of the levees and sea-level rise. The report
    listed six different methods to enlarge existing levees and concluded that whichever
    method was used, “appropriate design, construction, monitoring, and maintenance
    procedure should be followed.” The report concluded that in light of “the uncertainty and
    continuing research involved in predicting the impacts of climate change on the SF Bay
    Area, the flood protection estimates should be revisited with each” long-term flood-
    protection plan. Levees will be surveyed to evaluate the effects of levee settlement, and
    based on those surveys’ updated information, “recommendations for updated levee flood
    protection elevations, if appropriate, and levee maintenance and enlargement, if needed,
    will be prepared and implemented.”
    A different engineering firm provided a peer review of the long-term flood control
    plan and opined that Geosyntec’s evaluation of settlements and research about predicted
    sea-level rise were “generally appropriate for the site conditions.” The firm noted that
    reviewing and updating the flood-protection plan every five years was appropriate, given
    the “unknowns associated with sea level rise.”
    17
    b. Analysis
    The parties dispute whether the adoption of mitigation measure No. 3.5.6d
    improperly deferred CEQA’s required environmental assessment.
    As an initial matter, we agree with Redwood and the Marin County entities that a
    very practical reason prevented mitigation measures from being “fully formulated” at the
    time of project approval: namely, the uncertainty of when and how much sea levels may
    rise. (Rialto Citizens, supra, 208 Cal.App.4th at p. 944.) The landfill opponents
    apparently do not contend otherwise. Thus, the question is whether the measure’s
    performance criteria were sufficiently specific at the time of project approval. (Ibid.)
    Redwood acknowledges that its levee system must be maintained to protect the
    landfill from flooding, and it has previously demonstrated a commitment to do so. The
    EIR continues this commitment by agreeing to study the issue every five years to
    determine whether the levees should be raised even higher. This strikes us as reasonable
    in the face of the substantial uncertainties of sea-level rise.
    The landfill opponents compare the EIR in this case to the one found inadequate in
    CBE, supra, 
    184 Cal.App.4th 70
    . In that case, Chevron sought permits to allow its
    Richmond refinery to process additional types of crude oil. (Id. at p. 75.) A draft EIR
    stated that the project would result in a net increase of 898,000 metric tons of carbon
    dioxide emissions per year (reportedly the equivalent of the emissions generated by
    160,000 cars), but it declined to make conclusions about the possible impacts of the
    emissions. (Id. at pp. 90-91.) After several objections were raised to the draft EIR’s
    treatment of greenhouse gases, the final EIR acknowledged the environmental
    significance of greenhouse-gas emissions and their effect on global warming, but it did
    not conclude that the refinery’s additional emissions would have a significant effect on
    the environment. (Id. at p. 90.) After the final EIR was issued, “there was an outpouring
    of public comment” criticizing the downplaying of the effect of greenhouse gases. (Ibid.)
    After the passage of the California Global Warming Solutions Act of 2006 (California
    Global Warming Act, Health & Saf. Code, § 38500 et seq.) and the publication of a white
    paper on how to assess greenhouse-gas emissions, a new volume of the EIR was issued
    18
    that acknowledged that the increase of 898,000 metric tons of emissions would most
    likely have a significant effect on the environment. (CBE, at p. 91.) The final EIR
    proposed a mitigation measure to require Chevron, within a year of project approval, to
    submit to a plan to be approved by Richmond’s city council to reduce the additional
    emissions. (Ibid.) The report also listed a handful of possible measures to be considered
    to mitigate the emissions. (Id. at p. 92.)
    This court found that the mitigation plan was deficient because it “merely
    propose[d] a generalized goal of no net increase in greenhouse gas emissions and then
    set[] out a handful of cursorily described mitigation measures for future consideration
    that might serve to mitigate the 898,000 metric tons of emissions resulting from the
    Project.” (CBE, supra, 184 Cal.App.4th at p. 93.) The possible mitigation measures
    were “nonexclusive, undefined, untested and of unknown efficacy,” and the only measure
    of the mitigation plan’s success was whether the city council adopted it—“outside of any
    public process a year after the Project [was] approved.” (Ibid.) The court concluded that
    “for kinds of impacts for which mitigation is known to be feasible, the EIR may give the
    lead agency a choice of which measure to adopt, so long as the measures are coupled
    with specific and mandatory performance standards to ensure that the measures, as
    implemented, will be effective.” (Id. at p. 94, italics added.)
    Redwood and the Marin County entities contend that the EIR here is
    distinguishable because the mitigation is plainly set forth in the measure itself:
    “protection from the 100-year flood in the face of rising sea level and increased flood
    frequency and intensity.” The landfill opponents dismiss this performance measure,
    claiming it lacks adequate performance criteria because there is no indication how
    Redwood must design and construct the levees. They acknowledge that the challenged
    mitigation measure specifies that levees shall continue to be designed in order to protect
    the landfill from a 100-year flood, but they posit that the measure “could have specified a
    minimum levee height as a performance standard, which is the performance criteria now
    for protection against a 100 year flood.”
    19
    We conclude that Redwood and the Marin County entities have the stronger
    argument. There were compelling practical reasons not to set a minimum levee height at
    the time the EIR was prepared because it was unclear when and how high sea levels
    would rise, and how that rise might affect the waterways near the landfill. Because of
    this uncertainty, mitigation measure No. 3.5.6d requires Redwood to review, every five
    years during the entire remaining operating life of the landfill and postclosure
    maintenance period, whether known sea-level estimates are “current with the most recent
    and broadly-accepted predictions for flood levels, following consultation with the U.S.
    Geological Survey, the San Francisco Bay Conservation and Development Commission,
    and other monitoring agencies that track bay and ocean levels and that may provide
    estimates of mean sea level rise and areas subject to future inundation.” This reference to
    widely-accepted sea-level predictions is an adequate measure to guide compliance, and
    we are therefore not persuaded by the landfill opponents’ argument that mitigation
    measure fails to incorporate or refer to any regulatory scheme. (Oakland Heritage
    Alliance v. City of Oakland (2011) 
    195 Cal.App.4th 884
    , 906 [“[A] condition requiring
    compliance with regulations is a common and reasonable mitigation measure, and may be
    proper where it is reasonable to expect compliance”].)
    This case is distinguishable from San Joaquin Raptor Rescue Center v. County of
    Merced (2007) 
    149 Cal.App.4th 645
    , upon which the landfill opponents rely. In that
    case, the court faulted an EIR because it included a generalized goal of maintaining
    biological resources near the proposed project but failed to include any specific criteria or
    standards to protect those resources. Thus, the success or failure of the mitigation efforts
    depended on plans that had not yet been formulated or analyzed without any justification
    for their deferral. (Id. at pp. 668-671.) Here, the EIR reveals an obligation on the part of
    Redwood to protect the levee system from a 100-year flood. Currently, that means
    keeping the levees nine feet above mean sea level. Given the uncertainty about the
    timing and extent of sea-level rise, we conclude that this approach is specific enough.
    (California Native Plant Society v. City of Rancho Cordova (2009) 
    172 Cal.App.4th 603
    ,
    621 [“[W]hen a public agency has evaluated the potentially significant impacts of a
    20
    project and has identified measures that will mitigate those impacts, the agency does not
    have to commit to any particular mitigation measure in the EIR, so long as it commits to
    mitigating the significant impacts of the project”], italics added.) This court recently
    recognized that “premature attempts to evaluate effects that are uncertain to occur or
    whose severity cannot reliably be measured is ‘a needlessly wasteful drain of the public
    fisc.’ ” (Citizens for a Sustainable Treasure Island v. City and County of San Francisco
    (2014) 
    227 Cal.App.4th 1036
    , 1061.)
    We agree with Redwood and the Marin County entities that this case is akin to
    Sacramento Old City Assn. v. City Council (1991) 
    229 Cal.App.3d 1011
    , where
    Sacramento’s city council (the City) sought to expand its downtown convention center
    and build an office tower. (Id. at p. 1015.) To address concerns about lack of adequate
    parking, the EIR required a transportation-management plan to be prepared to reduce
    project-related traffic and parking. (Id. at pp. 1019-1020.) The EIR also listed potential
    mitigation measures and identified seven to be studied, analyzed, and possibly
    incorporated into the transportation-management plan. (Id. at pp. 1021-1023, 1030.) The
    Court of Appeal rejected the challenge to these measures as inadequate, concluding that
    the City “did not minimize or ignore the [parking] impacts in reliance on some future
    parking study” and in fact approved funds for “a major study of downtown
    transportation.” (Id. at pp. 1028-1029.) “[F]or kinds of impacts for which mitigation is
    known to be feasible, but where practical considerations prohibit devising such measures
    early in the planning process . . . , the agency can commit itself to eventually devising
    measures that will satisfy specific performance criteria articulated at the time of project
    approval. Where future action to carry a project forward is contingent on devising means
    to satisfy such criteria, the agency should be able to rely on its commitment as evidence
    that significant impacts will in fact be mitigated.” (Ibid.) As the City recognized in
    Sacramento Old City Assn., Redwood and the Marin County entities here recognize the
    possible significant environmental effects of the project and required a financial
    commitment to offset these impacts. (See also § 43509 [landfill owners required to
    21
    calculate costs for closure and postclosure maintenance for as long as solid waste could
    adversely affect water quality].)
    Finally, we reject the landfill opponents’ brief argument that sea-level rise was
    addressed only late in the process. The flood plan was completed prior to project
    approval, parties were provided access to it before the project was approved, and a
    coalition of environmental groups (including respondent No Wetlands) commented on it.
    In short, we disagree with the trial court’s conclusion that the EIR improperly
    deferred mitigation of sea-level rise.
    3. The EIR Did Not Improperly Defer Mitigation to Protect Groundwater.
    a. Background
    The landfill opponents next challenge mitigation measures meant to protect
    groundwater from leachate, which is “liquid that has come in contact with or percolated
    through waste materials and has extracted or dissolved substances therefrom.” As with
    protecting the area from flooding, managing leachate at the Redwood Landfill is not new.
    A leachate-management plan was developed in 1992, and a leachate collection-and-
    removal trench was built around the perimeter of the landfill over a 13-year period, from
    1991 to 2004. Redwood has annually reported on the leachate trench to the California
    Regional Water Quality Control Board, San Francisco Bay Region. The landfill also
    maintains a system to monitor and detect any release of leachate into groundwater, as
    required by California Code of Regulations, title 27, section 20380, and there has been no
    verified escape of leachate from the site.
    During the comment period, concerns were raised over the effectiveness of the
    leachate collection-and-removal system. An amended response to comments, dated
    March 2008, summarized several hypothetical “failure scenarios” in which leachate could
    escape and identified mitigation measures to prevent these scenarios. One scenario could
    be caused by a land-filling method that was discontinued by 1970. When the landfill was
    first opened, the operator used a trench-fill method, whereby trenches were dug, filled
    with waste, and then covered. Little is known about these past procedures, and it is
    unclear how deep the trenches were dug. But they may have been dug below the layer of
    22
    bay mud (which is less permeable) and into more porous alluvium, which could allow
    leachate to contaminate groundwater.
    The EIR contains two mitigation measures to address the possibility of leachate
    migrating through old trench fills, and they are both challenged by the landfill opponents.
    Measure No. 3.4.7i requires an investigation of the trenches and provides, “The applicant
    shall, through historical research and site investigations, map the location and dimensions
    (including depth) of all trench fills located at the site. The applicant shall undertake any
    necessary subsurface investigations to ascertain whether any trench fills were excavated
    into the Pleistocene Alluvium underlying the Bay Mud. If not, no further action is
    required. If so, the applicant shall develop and implement a plan to correct this condition.
    The plan shall be reviewed and approved by the RWQCB [California Regional Water
    Quality Control Board, San Francisco Bay Region]. The plan may entail: a. installation
    of leachate extraction wells at sufficient frequency and depth within the old trenches to
    prevent downward migration of leachate into the underlying alluvium; b. excavation of
    all waste from the trench and replacement with a liner that meets current regulatory
    standards; or c. another engineered solution.”
    A related mitigation measure, No. 3.4.7j, also addresses the possible migration of
    leachate: “After completion of the study required by Mitigation Measure 3.4.7i, the
    RWQCB shall make a determination as to whether an improved program to monitor
    groundwater within the Pleistocene Alluvium that underlies the Bay Mud is warranted to
    ensure that localized inconsistencies in the hydrogeologic system are considered, and that
    monitoring data characterize the quality of groundwater under both reference conditions
    and that which could be contaminated by leachate from the landfill. The applicant shall
    consult with the RWQCB regarding the need to[] locate and install additional wells,
    screened in the alluvium, to augment the existing wells (currently there are 4 wells in the
    alluvium . . . ). Since the gradient within the alluvium is tidally influenced, the alluvial
    well network will be evaluated to define upgradient and downgradient locations (with
    consideration of tidal influence) in order to properly locate wells. Should additional
    monitoring be required by RWQCB, a sampling and analysis plan, including schedule,
    23
    shall be developed in consultation with the RWQCB, and monitoring results will be
    added to the facility’s semi-annual and annual monitoring reports to the RWQCB. If
    monitoring reveals that contamination is occurring in the alluvium, the applicant shall
    develop a remediation plan. The remediation plan shall be reviewed and approved by the
    RWQCB. Remediation may entail pump and treat methods, treat-in-place methods, or
    other methods approved by the RWQCB. Treatment shall continue as long as
    contamination is present or until a water quality objective established by the RWQCB is
    met.”
    b. Analysis
    The landfill opponents argue that the EIR improperly defers developing a plan to
    monitor and remediate possible leachate contamination. The challenged mitigation
    measures, however, are only two of 11 lengthy measures designed to address the
    concern.11 The other nine measures call for Redwood (1) to continue ongoing practices
    to minimize leachate and promote its collection and reuse, (2) to continue monitoring
    daily activity at the landfill and adhere to steps already in place under the landfill’s leak-
    or-spill contingency plan, (3) to take steps following a “significant seismic or rare rainfall
    event” to address possible disruption to the leachate systems, (4) to take additional and
    specific steps in the event leachate is detected, (5) to commence a leachate-pumping
    program, (6) to update its leak-or-spill contingency plan to accommodate changes in the
    proposed project, (7) to implement a hydraulic-gradient-monitoring program, (8) to
    maintain equipment capable of continuing operations during a power outage, and (9) to
    continue operating the leachate system after the landfill is closed. These mitigation
    measures, which are unchallenged by the landfill opponents, demonstrate a commitment
    to keep leachate from contaminating groundwater.
    The landfill opponents nonetheless contend, and the trial court agreed, that the two
    challenged mitigation measures amount to an improper deferral of a complete analysis of
    11
    Impact No. 3.4.7 provides: “If not properly designed, the proposed Leachate
    Collection and Recovery System . . . could allow leachate to migrate off-site and
    potentially contaminate off-site groundwater and surface water.”
    24
    the potential impact on groundwater. We disagree. The opponents again compare this
    case to CBE, supra, 
    184 Cal.App.4th 70
    . But part of the reason this court found the
    mitigation measures in CBE inadequate was because Chevron acknowledged only late in
    the process that the emission of greenhouse gases could negatively impact the
    environment. (Id. at pp. 90-92.) While it is true that the two mitigation measures here
    were introduced only after concerns were raised during the comment period, Redwood
    never denied the need for leachate management, and it has a demonstrated record of
    monitoring, managing, and reporting on its leachate system.
    The landfill opponents claim that the measures lack “objective criteria or
    performance standards,” such as compliance with a regulatory scheme. But the two
    measures do not exist in a vacuum and are part of a detailed and ongoing plan to monitor
    leachate. The current system complies with the California Code of Regulations, and
    there is no evidence to suggest that the new monitoring system will not. And because
    there was no evidence of leachate migration, it was reasonable for the EIR to conclude
    that further study was necessary before further mitigation measures were specified.
    (Citizens for a Sustainable Treasure Island v. City and County of San Francisco, supra,
    227 Cal.App.4th at pp. 1060-1061 [“ ‘foreseeing the unforeseeable’ is not required, nor is
    predicting the unpredictable or quantifying the unquantifiable”]; Save Cuyama Valley v.
    County of Santa Barbara (2013) 
    213 Cal.App.4th 1059
    , 1070-1071 [mitigation measure
    sufficient where mining company agreed to take corrective action if “ ‘adverse hydraulic
    conditions’ ” detected]; National Parks & Conservation Assn. v. County of Riverside
    (1999) 
    71 Cal.App.4th 1341
    , 1366 [reasonable to conclude that further study necessary
    before requiring fence to protect species from landfill project]; Towards Responsibility in
    Planning v. City Council (1988) 
    200 Cal.App.3d 671
    , 681 [adoption of EIR “need not be
    interminably delayed to include results of works in progress which might shed some
    additional light on the subject”].)
    We conclude that the challenged mitigation measures were adequate.
    25
    E. The EIR Sufficiently Considered Potential Health Impacts from Air Emissions.
    1. The EIR’s Discussion of the Project’s Effect on Air Quality.
    Solid-waste landfills generate gases formed when organic waste decomposes and
    when vapors are released from volatile compounds. Decomposition creates methane and
    carbon dioxide (CO2). Although incinerating collected landfill gas is considered to be
    “highly effective in reducing potentially harmful constituents contained in the gas,” about
    25 percent is not recovered, and its release into the atmosphere “has the potential to
    contribute to air pollution and to expose people to toxic air contaminants.” Landfill gas
    may contain trace quantities of toxic air contaminants such as benzene and possibly
    chlorinated hydrocarbons. The contaminants contribute to air pollution, which can cause
    short- or long-term health problems, including acute respiratory infections, chronic
    bronchitis, pulmonary emphysema, and bronchial asthma.
    Testing at the landfill in June 1988 found trace amounts of benzene, but some of
    these amounts may have come from vehicle emissions. The testing revealed no
    chlorinated hydrocarbons. The EIR found that the proposed expansion of the landfill
    could potentially increase toxic air contaminates because more waste will decompose,
    composting operations will enlarge, and more diesel trucks and equipment will be used.
    It calculated that the expansion could result in an increase of about 13 pounds of reactive
    organic gases. The EIR assumed that, as a worst-case scenario, those new emissions
    would contain 500 parts per million (by volume) of benzene. Such an increase would
    result in an increased cancer risk, estimated to cause an additional 1.2 cancer cases for
    every 100 million people exposed. This was considered “well below the significance
    threshold of 10 in a million.” The increased cancer risk from additional composting
    emissions was also predicted to be “well below the significance threshold of 10 in a
    million.” But the health risks from increased diesel-truck emissions was estimated to be
    18 additional cancer cases for every million people exposed, which “exceeds the
    significance threshold of 10 new cancer cases for every million people exposed.”
    The EIR also discussed respirable particulate matter. Particulate matter, or “PM,”
    refers to extremely small solid or liquid particles that can be suspended in the
    26
    atmosphere. (California Unions for Reliable Energy v. Mojave Desert Air Quality
    Management Dist. (2009) 
    178 Cal.App.4th 1225
    , 1231.) Particulate matter may be
    measured in microns (a micron is one one-millionth of a meter, a micrometer). (Id. at
    pp. 1231-1232.) Particulate matter made up of particles that are 10 micrometers or less in
    diameter (PM-10) is considered an air pollutant. (Ibid.; 
    40 C.F.R. § 50.6
    (c) (2014).) PM-
    10 “can be further subclassified into fine particles, which are 2.5 micrometers or less in
    diameter” (PM-2.5). (California Unions, at p. 1232; 
    40 C.F.R. §§ 50.7
    , 50, appen. L
    (2014).) The federal Clean Air Act requires the Environmental Protection Agency to
    prescribe national ambient air-quality standards. (
    42 U.S.C. § 7409
    (a), (b).) Separate
    standards for PM-10 and PM-2.5 have been established (40 C.F.R §§ 50.5(a), 50.7), and
    areas that fail to meet those standards are designated as nonattainment areas. (
    42 U.S.C. § 7407
    (d).) Although the EIR here identified national standards for both types of
    particulate matter, it did not separately assess the significance of PM-2.5 and PM-10.
    Instead, it explained that PM-10 includes PM-2.5, and it analyzed only PM-10,
    explaining that all PM-2.5 was also PM-10.
    This approach of analyzing PM-10, without separately analyzing PM-2.5, was
    consistent with CEQA guidelines prepared in 1999 by the Bay Area Air Quality
    Management District (BAAQMD), which regulates air quality in the area and at the
    landfill. BAAQMD “is the agency primarily responsible for assuring that national and
    State ambient air quality standards are attained and maintained in the San Francisco Bay
    Area.” Its responsibilities include adopting and enforcing rules and regulations
    concerning air-pollutant sources and monitoring ambient air-quality conditions. Its 1999
    CEQA guidelines for preparing EIRs provided threshold significance levels for PM-10,
    but not separately for PM-2.5.
    The EIR quantified the increased emissions generated by the project as follows:
    262 pounds per day of reactive organic gases, coming mostly from composting and air
    drying sludge; 242 pounds per day of nitrogen oxides, coming mostly from vehicle traffic
    and off-road equipment; and 394 pounds per day of PM-10, coming mostly from fugitive
    dust generated by landfill operations. These totals exceeded BAAQMD’s significance
    27
    criteria of 80 pounds for each category, and the impact was considered significant. The
    EIR concluded that, even with mitigation measures implemented to substantially reduce
    emissions, it was unlikely the emissions of reactive organic gases, nitrogen oxides, and
    PM-10 would be reduced below BAAQMD’s significance threshold, and the project’s
    combined emissions thus would be considered “significant and unavoidable.”
    In response to public comment about air-quality and other issues (including
    greenhouse gas emissions, see post, § II.F.), Redwood submitted a letter dated June 9,
    2008, to Marin EHS, with several attachments. Marin EHS certified the EIR the next
    day, on June 10.
    2. The Trial Court’s Ruling on Air Quality.
    The trial court found two deficiencies in the EIR’s discussion of air quality. It first
    acknowledged that the final EIR found that emissions of toxic air contaminates could
    cause significant health risks but that mitigation measures would reduce the increase of
    cancer risk to less-than-significant level. But it concluded that the final EIR was
    deficient because it failed to discuss “the increased non-cancer health risks from the
    [toxic air contaminates] or from the other air pollutants.” (Original italics.) According to
    the trial court, there was “no discussion of the increased impact on non-cancer health
    risks from non-carcinogenic [toxic air contaminates] or from the other air pollutants
    which EHS found to be significant and unavoidable.”
    Second, the trial court found that the final EIR was inadequate because it “fail[ed]
    to analyze the formation and impacts of very fine particulate matter having a diameter of
    2.5 microns or less” (i.e., PM-2.5). It based this conclusion in part on information
    apparently not taken from the administrative record, but instead from the website of the
    California Air Resources Board (ARB). According to the trial court, the website revealed
    that “in June 2002 the ARB adopted new ambient air quality standards for PM-10 and
    PM-2.5, which rules became effective in 2003. Therefore, the different standards for
    PM-2.5 were available at the time of [the final EIR] preparation in July 2005.” (Original
    italics.) The court concluded that the risk of health impacts from PM-2.5 were different
    from PM-10, “otherwise the ARB would not have bothered to establish different air
    28
    quality thresholds for the two emissions.” The fact that the ARB’s threshold of
    significance for PM-2.5 was lower than the threshold for PM-10 “suggest[ed]” it was
    potentially more harmful than PM-10. The court concluded it was “reasonable to expect”
    Marin EHS to use “the easily available California ARB standards in calculating the
    threshold of significance for PM-2.5 emissions,” and that use of those standards was
    “probably mandatory.” The court concluded that the error amounted to an abuse of
    discretion because Marin EHS “did not use its best efforts to determine if there was
    regulatory guidance from another agency that it could use to quantify the health risk from
    PM-2.5 emissions.”
    3. The EIR’s Treatment of PM-2.5 Was Not an Abuse of Discretion.
    We first address the trial court’s ruling on the EIR’s approach to PM-2.5.
    Redwood and the Marin County entities argue that the trial court failed to appreciate that
    the standards the court cited were for ambient air-quality standards and not thresholds of
    significance to be used for EIRs prepared under CEQA. (E.g., Citizens for Responsible
    Equitable Environmental Development v. City of Chula Vista (2011) 
    197 Cal.App.4th 327
    , 334 [where increases in air pollutants are below significance criteria, they are
    considered to have no significant impact on ambient-air quality].) We agree it was
    improper for the trial court to set aside an EIR based on its independent research of air-
    quality standards. “[O]ur Supreme Court has cautioned reviewing courts against
    performing our own scientific critiques of environmental studies, a task for which we
    have neither resources nor scientific expertise.” (Eureka Citizens for Responsible
    Government v. City of Eureka (2007) 
    147 Cal.App.4th 357
    , 372, citing Laurel Heights
    Improvement Assn. v. Regents of University of California (1988) 
    47 Cal.3d 376
    , 393.)
    “Our duty is not to pass on the validity of the conclusions expressed in the EIR, but only
    on the sufficiency of the report as an informative document.” (Eureka Citizens, at
    p. 372.)
    We cannot say that the EIR’s approach in evaluating PM-2.5 was an abuse of
    discretion since the EIR relied on BAAQMD guidelines in effect at the time the EIR was
    prepared. (Rialto Citizens, 
    supra,
     208 Cal.App.4th at p. 933 & fn. 15 [EIR’s analysis of
    29
    air quality reasonable in light of approach recommended by agency responsible for
    attaining state and federal clean-air standards in region].) The federal administrative
    decision upon which the landfill opponents rely does not alter our conclusion. (In the
    Matter of Louisville Gas and Electric Co. (Aug. 12, 2009, Petn. No. IV-2008-3), before
    the Administrator of the U.S. Environmental Protection Agency (EPA).)12 In considering
    an objection to the construction of a new coal-fired boiler, the administrator concluded
    that it was inappropriate to use PM-10 as a surrogate for PM-2.5 in that case. The
    administrator stressed, however, that the decision whether PM-10 is a reasonable
    surrogate for PM-2.5 depends on “the facts and circumstances of the specific permit at
    issue,” and it provided detailed guidance on how to demonstrate whether PM-10 is a
    reasonable surrogate for PM-2.5 in a particular case. It was the landfill opponents’
    burden to prove the EIR’s inadequacy (Save Cuyama Valley v. County of Santa Barbara,
    supra, 213 Cal.App.4th at p. 1067), and they have failed to do so here.
    4. The EIR Adequately Analyzed the Potential Increase in Pollution.
    A closer question is whether the EIR adequately analyzed the potential health
    effects of increased pollution. The Guidelines specify that an EIR “shall identify and
    focus on the significant environmental effects of the proposed project.” (Guidelines,
    § 15126.2, subd. (a).) “Direct and indirect significant effects of the project on the
    environment shall be clearly identified and described, giving due consideration to both
    the short-term and long-term effects. The discussion should include . . . health . . .
    problems caused by the physical changes” to the environment. (Ibid., italics added.) The
    Guidelines further direct an EIR to “[d]escribe any significant impacts, including those
    which can be mitigated but not reduced to a level of insignificance.” (Guidelines,
    § 15126.2, subd. (b).)
    12
    We take judicial notice of the order (Evid. Code, §§ 452, subd. (c), 459, subd. (a)),
    although we recognize, as Redwood and the Marin County entities point out, that the
    decision could not have been relied upon by Marin EHS because it was published a year
    after the project was approved.
    30
    The Fifth District has interpreted Guideline section 15126.2 to mean that an EIR
    must correlate identified adverse air-quality impacts to resultant adverse health effects.
    (Bakersfield Citizens for Local Control v. City of Bakersfield (2004) 
    124 Cal.App.4th 1184
    , 1219 (Bakersfield Citizens).) Bakersfield Citizens considered the two EIRs of two
    shopping centers. (Id. at p. 1193.) Both EIRs concluded that the shopping centers would
    have significant and unavoidable direct adverse impacts on air quality. (Id. at pp. 1194,
    1219.) The court found that both EIRs were deficient because “neither EIR
    acknowledge[d] the health consequences that necessarily result from the identified
    adverse air quality impacts. Buried in the description of some of the various substances
    that make up the soup known as ‘air pollution’ are brief references to respiratory
    illnesses. However, there is no acknowledgement or analysis of the well-known
    connection between reduction in air quality and increases in specific respiratory
    conditions and illnesses. After reading the EIRs, the public would have no idea of the
    health consequences that result when more pollutants are added to a nonattainment basin.
    On remand, the health impacts resulting from the adverse air quality impacts must be
    identified and analyzed in the new EIR’s.” (Id. at p. 1220.)13
    Redwood and the Marin County entities point out that the trial court concluded
    that the final EIR adequately addressed increased cancer risks from toxic air
    contaminants and only inadequately addressed “non-cancer” health risks. As to
    noncancer health risks, they argue that the EIR sufficiently addressed them by pointing to
    the portions of the EIR explaining the hazard index used to evaluate threshold levels of
    noncancer health risks. The EIR explains the hazard index “is the ratio of the predicted
    exposure concentration to a threshold level, as established by [California’s Office of
    13
    No party petitioned for review in Bakersfield Citizens, 
    supra,
     
    124 Cal.App.4th 1184
    .
    The Fifth District recently relied on the case in setting aside an EIR for a proposed
    master-planned community for persons age 55 or older in north-central Fresno County,
    holding that a “simple statement in an EIR that the significant adverse air quality impacts
    will have an adverse impact on human health fails to comply with” CEQA standards.
    (Sierra Club v. County of Fresno (2014) 
    226 Cal.App.4th 704
    , 745.) The Supreme Court
    has granted review in Sierra Club to address “issues concerning the standard and scope of
    judicial review under [CEQA].” (Review granted Oct. 1, 2014, S219783.)
    31
    Environmental Health Hazard Assessment], that could cause adverse health effects.”
    The landfill opponents do not directly counter the argument that the EIR sufficiently
    addressed noncancer health effects in addition to the cancer risk of toxic air
    contaminants. (People v. Bouzas (1991) 
    53 Cal.3d 467
    , 480 [ignoring point in
    respondent’s brief viewed as apparent concession].) We conclude that the EIR’s analysis
    of potential noncancer health impacts from toxic air contaminants was acceptable since
    the analytical approach was consistent with BAAQMD’s guidelines. (Rialto Citizens,
    
    supra,
     208 Cal.App.4th at p. 933.)
    But the broader question remains whether it was sufficient for the EIR to state that
    levels of reactive organic gases, nitrogen oxides, and PM-10 would likely be above
    BAAQMD’s significance threshold of 80 pounds per day, a significant-and-unavoidable
    effect, without further analysis of the potential health impacts of this increased pollution.
    The landfill opponents do not dispute that the EIR’s discussion of air quality complied
    with BAAQMD guidelines, and they fail to propose any specific method for an analysis
    that they would consider to be sufficient. They simply argue that the EIR is deficient
    under Bakersfield Citizens, 
    supra,
     
    124 Cal.App.4th 1184
    . Redwood and the Marin
    County entities argue that Bakersfield Citizens is distinguishable because the EIR’s
    discussion was consistent with BAAQMD’s guidelines, and BAAQMD did not challenge
    the method used. Moreover, the pollution-control district in Bakersfield Citizens
    expressed concerns that emissions from the proposed project would make it more
    difficult to attain mandated air-quality standards (id. at p. 1216) and had uncertain
    authority over the project if and when it were to be completed. In contrast, BAAQMD
    expressed no similar concerns here, and it will continue to have regulatory control
    authority over the landfill. The landfill opponents counter that BAAQMD’s guidelines
    should not be controlling because they were prepared in 1999, years before Bakersfield
    Citizens was decided in 2004.
    After all is said and done, we believe Redwood and the Marin County entities
    have the better argument. Bakersfield Citizens, supra, 
    124 Cal.App.4th 1184
     did not
    itself offer any specific guidance on how to evaluate air quality, and, unlike BAAQMD,
    32
    this court lacks the scientific expertise to provide it. We conclude that an EIR’s
    discussion of potential impacts of a project on air quality that is consistent with then-
    applicable guidelines of a regional air-quality board should normally be sufficient to
    satisfy CEQA’s disclosure requirements, and in this case it was.
    This case also stands in stark contrast with Berkeley Keep Jets Over the Bay
    Com. v. Board of Port Cmrs. (2001) 
    91 Cal.App.4th 1344
    , upon which the landfill
    opponents rely. Relying on a speciation profile published by the California Air
    Resources Board, the draft EIR in that case recognized that a planned expansion of an
    airport by the Oakland Port Authority (the Port) would increase toxic air contaminants
    but stated that the environmental effects of the increase were unknown because there was
    “no approved, standardized protocol” for assessing the risks, and there were no
    significance criteria. (Id. at p. 1364.) After the draft EIR was circulated, an air-quality
    expert criticized the speciation profile as being outdated and explained that a newer
    profile was currently being used. (Id. at p. 1365.) The Port then published a response
    that wrongly suggested that the resources board did not recommend using the newer
    profile. (Id. at pp. 1351, 1365-1366.) The final EIR stated that the public-health impact
    of toxic air contaminants was unknown, despite the fact that “[v]oluminous documentary
    evidence was submitted to the Port supporting the assertion that an approved and
    standardized protocol did exist which would enable the Port to conduct a health risk
    assessment.” (Id. at pp. 1367-1368.) Division Two of this court concluded that the Port
    had not made a sufficient effort to collect data or make further inquiries of environmental
    or regulatory agencies having expertise on the subject. (Id. at p. 1370; see also § 21080.3
    [before deciding whether EIR is required, lead agency “shall consult with all responsible
    agencies”].) “The fact that a single methodology does not currently exist that would
    provide the Port with a precise, or ‘universally accepted,’ quantification of the human
    health risk from [toxic air contaminant] exposure does not excuse the preparation of any
    health risk assessment—it requires the Port to do the necessary work to educate itself
    about the different methodologies that are available.” (Berkeley Jets, at p. 1370, original
    italics.) Here, by contrast, Marin EHS did just that by relying on BAAQMD’s CEQA
    33
    guidelines. And while the EIR in Berkeley Jets “failed to acknowledge the opinions of
    responsible agencies and experts who cast substantial doubt on the adequacy of the EIR’s
    analysis of” toxic-air contamination (id. at p. 1371), there is no such consensus of experts
    here that the EIR came up short.
    We conclude that the EIR’s discussion of the potential increase in air pollution
    satisfied CEQA.
    F. The EIR Sufficiently Analyzed Greenhouse Gas Emissions.
    1. Background.
    Finally, we address the EIR’s analysis of greenhouse gas (GHG) emissions.
    Redwood’s final EIR responses to comments amendment dated March 2008 included a
    12-page section titled “Greenhouse Gas Emissions and Global Climate Change.” The
    amendment pointed out that since the final EIR was published in July 2005, the
    Legislature had passed the California Global Warming Act establishing the state’s goal of
    reducing greenhouse gas emissions to 1990 levels by 2020. It also pointed out that in
    2006, the Marin County Board of Supervisors adopted the Marin County Greenhouse Gas
    Reduction Plan, which sets a target of reducing GHG emissions countywide to 15 percent
    below 1990 levels by 2020. Finally, it remarked that “municipal solid waste landfills are
    a major source of GHGs, predominantly from fugitive landfill gas emissions, but also
    from emissions from fossil-fuel powered equipment and vehicles.”
    After describing the task of measuring the landfill gas generated at the Redwood
    Landfill as “difficult at best,” the response recognized several possible models for doing
    so. The EIR used the “Landfill Gas Emissions Model” (or LandGEM), a software
    application with a Microsoft Excel interface that is used by the EPA and also is
    recommended as “ ‘good practice’ ” by the Intergovernmental Panel on Climate Change.
    34
    The model uses different variables to calculate gas generation.14 The values of the
    variables depend on whether the landfill is arid, conventional, or wet. To estimate
    emissions, LandGEM can use either default values for these different types of landfills or
    site-specific data. Here, the default values for a conventional landfill were used. Using
    that model, the response included a five-page appendix calculating GHG outputs at the
    landfill for its current site-life estimates.
    Redwood presently has a system to collect landfill gas. It monitors the amount
    and composition of the gas collected and reports the results to BAAQMD as a condition
    of its permit. The amount of gas captured through the system approximately doubled
    between 2002 and 2006. Some methane nonetheless escapes into the atmosphere as so-
    called “fugitive methane emissions.” These emissions are made up of gases that are not
    captured by the collection system or are captured but not destroyed by the landfill’s flare
    system.
    Mitigation measure No. 3.2.5c proposed that Redwood apply to BAAQMD for the
    authority to construct power-generation engines to be fueled by landfill gas capable of
    producing four to five megawatts of power within two years of the California Integrated
    Waste Management Board concurring in the solid-waste facilities permit. The engines
    would replace the landfill’s flare system, “increase the overall capacity available to treat
    landfill gas, and w[ould] also result in the beneficial use of some portion of the landfill
    gas generated. Operation of the landfill-gas-powered generators w[ould] make the
    project consistent with Policy 4.2 of the Marin Countywide Plan Community
    Development element . . . , which calls for exploration and implementation, where
    possible, of opportunities for cost-effective energy savings that are compatible with other
    14
    The model “uses as inputs the amount of waste placed in the landfill annually; a factor
    (Lo) for the potential methane generation capacity, which depends on the type and
    composition of waste placed in the landfill; and a factor (k) for the methane generation
    rate, which determines the rate of methane generation for the mass of waste in the
    landfill, and which is related to environmental conditions within the landfill—primarily
    the amount of moisture. The output of LandGEM is the total predicted annual generation
    of gases, including CO2, methane, and [nonmethane organic compounds].” (Italics
    omitted.)
    35
    countywide and community goals.” The gas-fired engines were considered as substitutes
    for electricity generated from other sources. “From this viewpoint, power generation at
    Redwood Landfill under the Mitigated Alternative will offset GHG emissions associated
    with power production elsewhere.”
    Considering all the GHG emissions under the existing permit as compared to the
    mitigated alternative, the alternative was projected to result in a decrease of nearly
    2.2 million metric tons of carbon dioxide equivalent, a drop of about 33 percent as
    compared with the existing permit. This, of course, would reduce the potential impact on
    global warming. Still, under the mitigated alternative, the landfill would emit about twice
    the amount of GHGs in 2020 as it did in 1990. In order to reduce total emissions to at
    least 15 percent below 1990 levels, two mitigation measures were added. The first,
    No. 3.2.5f, requires Redwood to develop a GHG reduction plan, and the second,
    No. 3.2.5g, requires Redwood to continue to operate the landfill’s gas-collection system
    following closure of the landfill and as long as the landfill continues to produce landfill
    gas.
    The final EIR here was certified in June 2008, and the revised solid-waste facility
    permit was issued in December 2008. More than a year later, on March 18, 2010,
    Guidelines section 15064.4 became effective. This section provides that in determining
    the significance of impacts from GHG emissions, a lead agency should consider, among
    other factors, (1) the extent to which the project may increase or reduce GHG emissions
    as compared to the existing environmental setting, (2) whether the project emissions
    exceed a threshold of significance that the lead agency determines applies to the project,
    and (3) the extent to which the project complies with regulations or requirements adopted
    to implement a statewide, regional, or local plan for the reduction or mitigation of GHG
    emissions. (Guidelines, § 15064.4, subd. (b).)
    In response to the landfill opponents’ challenges to the EIR’s analysis of GHG
    emissions, the trial court upheld parts of the EIR and struck down others. Both sides
    36
    appealed. We address the issues in the order in which they were addressed in the trial
    court’s decision.15
    2. The EIR Sufficiently Analyzed the Project’s Cumulative Effects on
    Greenhouse Gases.
    Guidelines section 15130, subdivision (a) requires an EIR to “discuss cumulative
    impacts of a project when the project’s incremental effect is cumulatively
    considerable . . . .” “ ‘Cumulatively considerable’ means that the incremental effects of
    an individual project are significant when viewed in connection with the effects of past
    projects, the effects of other current projects, and the effects of probable future projects.”
    (Guidelines, § 15065, subd. (a)(3).) This situation arises where a project has multiple
    possible environmental effects that are limited when considered individually but
    significant when considered cumulatively. (Ibid.) In such a situation, an EIR’s
    discussion of cumulative impacts must include either (1) a “list of past, present, and
    probable future projects producing related or cumulative impacts,” or (2) a “summary of
    projections contained in an adopted local, regional or statewide plan, or related planning
    document, that describes or evaluates conditions contributing to the cumulative effect.”
    (Guidelines, § 15130, subd. (b)(1)(A).)
    The trial court found the EIR deficient for failing to analyze whether the impact
    from GHGs was “ ‘cumulatively considerable.’ ” The trial court acknowledged that
    Marin EHS’s responses to comments estimated GHG emissions over the life of the
    project, analyzed the estimated reduction of emissions, and adopted mitigation measures
    to reduce emissions. It faulted the EIR, however, for not using one of the two methods
    (list of projects or summary of projections) identified in Guidelines section 15130,
    subdivision (b). On appeal, Redwood and the Marin County entities contend that the
    court’s assessment was “clearly wrong,” because the EIR “plainly relied on a summary of
    15
    The parties devote several pages to whether, under Rialto Citizens, supra,
    
    208 Cal.App.4th 899
    , it was necessary to analyze GHGs in the first place, an argument
    that does not appear connected to any particular challenge to the EIR or necessary to our
    resolution to the issues raised. The landfill opponents filed a request for judicial notice of
    a document it argued was relevant to the issue. We now deny the request as moot.
    37
    projections in the Countywide Plan.” Having reviewed the projections in the EIR and
    their relation to federal, state, and local guidelines, we agree that the EIR sufficiently
    analyzed the cumulative effects of the project, and we reject the landfill opponents’ three
    arguments to the contrary.
    The landfill opponents first argue that the EIR failed to summarize projections
    from previously approved planning documents. As we understand their argument,
    however, they contend that an analysis of cumulative effects should have been global in
    scale. Because “the scope of the cumulative analysis should be global,” they argue, “the
    list of related projects in only Marin County does not comply with CEQA.” They also
    rely on the statement in City of Long Beach v. Los Angeles Unified School Dist. (2009)
    
    176 Cal.App.4th 889
    , 907 that “[a]n EIR’s cumulative impact analysis should include all
    sources of related impacts, not simply similar sources or projects.” We reject this
    argument because it would be entirely unrealistic to require an EIR’s analysis of a
    regional landfill to identify, let alone analyze, all sources of GHGs, even if limited only
    to other landfills. We likewise reject the landfill opponents’ argument that “the EIR fails
    to summarize related projects’ expected environmental effects.” They argue that “[a]
    summary of related projects’ global warming effects would have been reasonable to
    include in the EIR, especially since the EIR referred to the [Intergovernmental Panel on
    Climate Change], EPA, and California Energy Commission documents and stated that
    landfills like the Redwood Landfill are significant greenhouse gas sources.” Again,
    CEQA does not mandate that the EIR here analyze all methane-producing landfills, as the
    landfill opponents apparently suggest.
    Finally, we reject the landfill opponents’ argument that the EIR failed to analyze
    the cumulative impacts of “related projects” on the effects of global warming. We share
    their concerns about the grave impacts that global warming is expected to bring, both
    globally and in California. But it does not follow that the EIR here was required to
    analyze any and all projects that contribute to global warming. And, contrary to the
    landfill opponents’ argument, the EIR sufficiently acknowledged the severity of global
    warming.
    38
    3. Figures Used in the LandGEM Model Were Not an Abuse of
    Discretion.
    As explained above, the EIR used the LandGEM model to estimate landfill-gas
    emissions, using default values based on the determination that Redwood Landfill is a
    conventional landfill. The landfill opponents argue that substantial evidence does not
    support this method, both because Redwood Landfill is a wet landfill (meaning it
    produces more landfill gas at a faster rate) and because default values were used instead
    of site-specific data. We agree with the trial court that substantial evidence supports the
    method that was used.
    As we have stressed, it is not the role of a reviewing court to substitute its
    judgment for that of the agency when reviewing the record for substantial evidence to
    support the methodology used for studying a potential impact. (North Coast Rivers
    Alliance v. Marin Municipal Water Dist. Bd. of Directors (2013) 
    216 Cal.App.4th 614
    ,
    642-643.) “ ‘The fact that different inferences or conclusions could be drawn, or that
    different methods of gathering and compiling statistics could have been employed, is not
    determinative in a substantial evidence review.’ [Citation.] The issue is not whether
    other methods might have been used, but whether the agency relied on evidence that a
    ‘ “reasonable mind might accept as sufficient to support the conclusion reached” ’ in the
    EIR.” (Id. at p. 642.)
    According to the landfill opponents, there was no evidence in the EIR to support
    its use of default values for a conventional landfill, and it was not until Redwood
    39
    submitted a June 9, 2008 letter to Marin EHS in an attempt to “shore up the EIR” that it
    presented evidence to support the EIR’s conclusions.16
    Although no party raises this issue, we note that the landfill opponents do not
    specifically object to the use of the LandGEM model, only to the values selected. The
    administrative record contains a user’s guide to the LandGEM model, which could have
    been used by the landfill opponents to calculate different projections using values they
    believed were more accurate. Instead, it directs this court to a single table in a section
    titled “Landfill Gas Capture and Destruction” and complains that one column shows that
    annual landfill-gas flow increased by more than 100 percent between 2002 and 2006,
    whereas LandGEM modeling of methane generated over the same period increased by
    only about 14 percent—without providing any context for these figures or explaining
    how they affect the other four columns in the table, let alone the other detailed appendix
    generated using LandGEM.
    In any event, sufficient evidence supports the determination that Redwood
    Landfill may be considered conventional for purposes of LandGEM. The LandGEM
    user’s guide describes wet landfills as “bioreactor landfills where leachate and other
    liquids are added to accelerate waste decomposition.” But the record here shows that
    leachate is pumped out of Redwood Landfill. Although some liquid is then sprayed on
    the landfill, this is for purposes of dust control, and not to accelerate waste
    16
    The landfill opponents characterize this letter and its attachments as improper “post-
    EIR record packing.” But the material was part of the administrative record before the
    EIR was certified, even if only briefly. (§ 21167.6, subd. (e)(6) [all written comments
    submitted in connection with project part of administrative record]; cf. CBE, supra,
    184 Cal.App.4th at p. 88 [improper to rely on undisclosed data from oil refinery that was
    submitted after EIR certification].) Contrary to the landfill opponents’ argument, this is
    not comparable to situations in which potential significant environmental impacts are
    disclosed late in the process and left unanalyzed. (E.g., Vineyard Area Citizens, supra,
    40 Cal.4th at pp. 441-442 [final EIR contained inconsistent gross-demand figures for
    water and failed to include or describe relevant demand figures].) Here, Redwood was
    responding to issues already raised during environmental review. And, contrary to
    assertions made by counsel for No Wetlands at oral argument, Vineyard Area Residents
    permits an EIR to reference and incorporate previously prepared analyses. (Id. at
    pp. 442-443.)
    40
    decomposition. The landfill opponents failed to demonstrate that Redwood Landfill
    should be considered “wet” for purposes of LandGEM merely by pointing to some
    evidence that might support such a finding and referencing guidelines for analyzing site-
    specific data. (Save Cuyama Valley v. County of Santa Barbara, supra, 213 Cal.App.4th
    at pp. 1066-1067 [reviewing court accords “considerable deference” to EIR’s
    determinations, presumes them correct, and resolves all reasonable doubt in their favor].)
    4. The EIR’s Analysis of a Proposed Onsite Power Facility Was
    Adequate.
    We also reject the landfill opponents’ challenge to the plan to offset an increase in
    GHGs with the reduction of GHGs resulting from using engines fired by landfill gas to
    substitute for electricity generated from other sources. They first claim that the plan to
    offset the emissions “is nothing more than pure speculation.” “ ‘As with all substantial
    evidence challenges, an appellant challenging an EIR for insufficient evidence must lay
    out the evidence favorable to the other side and show why it is lacking. Failure to do so
    is fatal. A reviewing court will not independently review the record to make up for
    appellant’s failure to carry his burden.’ ” (Tracy First v. City of Tracy (2009)
    
    177 Cal.App.4th 912
    , 934-935.) The landfill opponents do not meet this burden. The
    plan to build power-generation engines to be fueled by landfill gas was described in detail
    as a way to mitigate the increase of GHG emissions. The landfill opponents may not
    simply claim that there was no evidence to support the plan or contend that support for it
    was found somewhere in Redwood’s “improper” June 9, 2008 letter, without explaining
    why the EIR’s plan was lacking. Contrary to the landfill opponents’ argument, the plan is
    an appropriate way to offset an increase in GHG emissions. (E.g., Guidelines, § 15126.4,
    subd. (c)(3) [lead agencies may consider feasible means of mitigating greenhouse-gas
    emissions, including off-site measures resulting in offsets that are not otherwise
    required].)
    We also disagree with the landfill opponents’ argument that the EIR’s plan to
    offset GHGs relied on an “impermissible future baseline.” The Guidelines provide that
    an EIR “must include a description of the physical environmental conditions in the
    41
    vicinity of the project, as they exist at the time the notice of preparation is published . . . ,
    from both a local and regional perspective. This environmental setting will normally
    constitute the baseline physical conditions by which a lead agency determines whether an
    impact is significant. The description of the environmental setting shall be no longer than
    is necessary to an understanding of the significant effects of the proposed project and its
    alternatives.” (Guidelines, § 15125, subd. (a), italics added.) In fact, the EIR here
    included a detailed description of the physical environmental conditions in the vicinity of
    the project. Consistent with the Guidelines and established precedent, the EIR used as its
    baseline “the design, operations, and environmental controls described in the 1995 Solid
    Waste Facilities Permit and other current permits, based on the 1994 [final ]EIR, as well
    as other applicable permits that have undergone separate environmental review.”
    (Communities for a Better Environment v. South Coast Air Quality Management Dist.
    (2010) 
    48 Cal.4th 310
    , 326, fn. 11; Fairview Neighbors v. County of Ventura (1999)
    
    70 Cal.App.4th 238
    , 242-243 [where EIR seeks continuation of operations previously
    reviewed under CEQA, appropriate to use previously approved activities as baseline].)
    In a somewhat confusing argument, the landfill opponents contend that
    “[e]missions reductions of CO2 from some undefined, unidentified power plants in a
    future hypothetical scenario are not legally part of the environmental baseline.” This
    argument apparently contends that the EIR improperly included off-site power plants as
    part of its baseline. We are not persuaded. The EIR specifically stated that the landfill
    would begin to generate its own power using landfill gas so that it would not have to rely
    on power from offsite sources. Thus, the EIR did not use “hypothetical emission
    reductions” as part of its baseline. We agree with the trial court that the EIR was not
    deficient in this regard.
    The trial court did fault the EIR for failing to estimate the CO2 emissions from the
    proposed onsite generation of electricity. According to the EIR: “Inventories of GHG
    emissions consider CO2 from decomposition of organic material to be ‘biogenic’—a
    component of the natural cycling of carbon in the biosphere and the atmosphere—and
    therefore these emissions are not ‘counted,’ ” and the report cited (but did not include)
    42
    reference materials supporting this approach. Appellants explain on appeal: “In other
    words, CO2 emissions would occur irrespective of whether methane combustion occurs.
    Accordingly, [landfill gas] derived emissions of CO2—including CO2 emissions from a
    [landfill gas to energy facility]—are considered part of the carbon cycle by all major
    GHG emission inventory and reporting systems.” In the trial court, appellants explained
    the EIR did not separately calculate the emissions of CO2 from the proposed facility
    because authoritative sources did not count natural production of CO2 as a GHG
    emission. The trial court sided with the landfill opponents, concluding that “Defendants
    [did] not specifically cite to the location in the referenced studies or reports that support
    [the EIR’s] methodology.”17
    The landfill opponents contend that the EIR “fails as an informational document”
    because it did not discuss “CO2 emissions from combusting methane in the Landfill Gas
    to Energy system.” They argue generally that omitting CO2 emissions from the EIR
    “denied the public the right to informed meaningful participation and denied [Marin
    EHS] the ability to engage in informed decision-making.” But they do not specifically
    address whether the EIR was required to discuss the CO2 emissions from the new onsite
    energy system in light of the EIR’s approach not to count these emissions because they
    would displace CO2 that would be produced naturally through decomposition processes.
    We acknowledge the EIR contains a small universe of evidence to support this
    approach. Redwood and Marin County note that the EIR “relied upon, and cited to,
    multiple technical reports asserting that biogenic CO2 is not counted in [greenhouse gas]
    emission inventories.” In their opening brief, however, they specify only two of those
    reports, which are apparently not contained in the administrative record. Finally in their
    17
    The trial court presumably meant that defendants did not adequately cite to the
    authorities in the EIR, as opposed to in their opposition brief in the trial court. Redwood
    and the Marin County entities posit that although the trial court did not cite authority for
    its ruling, it may have relied on Guidelines section 15148, which provides that any
    engineering-project reports and scientific documents relied on should be cited in the EIR
    but not included, and that the EIR “shall cite all documents used in its preparation
    including, where possible, the page and section number of any technical reports which
    were used as the basis for any statements in the EIR.”
    43
    reply brief, they direct this court to a copy of one of the sources, a December 2006 staff
    report from the California Energy Commission titled “Inventory of California
    Greenhouse Gas Emissions and Sinks: 1990 to 2004.”18 According to the report, “CO2
    and nitrous oxide emissions to the atmosphere occur when municipal solid waste . . . is
    combusted to make electricity. A portion of the waste stream is biogenic, and these CO2
    emissions are not counted because the carbon is recycled during the growth period of the
    biogenic materials.” They also point to a memorandum dated June 6, 2008, from SCS
    Engineers, which states: “Carbon dioxide emissions from flaring [landfill gases] or from
    [internal combustion] engines are considered biogenic in nature and are commonly not
    counted in GHG inventories, including those at the state and federal level. However, the
    EIR for this project conservatively included these emissions from the flaring of [landfill
    gas]. The [final EIR] did not explicitly list GHG emissions from the proposed [internal
    combustion] engines because emissions essentially do not change from the flaring of
    [landfill gas]. As such, the level of detail of analysis of potential [greenhouse gas]
    emissions from the [internal combustion] engines is appropriate. The [final EIR] did
    disclose that [internal combustion] engines are slightly less efficient than the flares in
    converting methane to carbon dioxide, so they are likely to have slightly greater methane
    emissions and slightly lower carbon dioxide emissions.”19 While this discussion may not
    have been exhaustive, we conclude there is sufficient evidence to support the EIR’s
    methodology as correct, especially since there is no indication it was incorrect.
    The landfill opponents argue this court should not rely on the June 6, 2008
    memorandum on the grounds that it is conclusory and was submitted late in the process.
    But, again, they cite no evidence suggesting the inaccuracy of the EIR’s premise that CO2
    emissions from the new onsite energy system would largely displace CO2 that would be
    18
    This court took judicial notice of this and other documents on July 24, 2013, without a
    determination of relevance.
    19
    Appellants also cite to two documents that appear to have nothing to do with
    calculating CO2 emissions: an environmental engineer’s résumé, along with a response
    comment that touts the benefits of onsite energy facilities but does not specifically
    address measuring CO2 emissions.
    44
    produced naturally through decomposition processes. Given that we presume the EIR to
    be adequate and that it is not our role to substitute our judgment for that of the agency,
    we conclude that the EIR was sufficient as an informational document in this regard.
    III.
    DISPOSITION
    The trial court’s granting the petition for a writ of mandate is affirmed in part and
    reversed in part. The matter is remanded, and the trial court is instructed to enter,
    consistent with this opinion, a new and different order denying the petition for writ of
    mandate. Appellants and real party in interest shall recover their costs incurred on appeal
    jointly and severally from respondents.
    _________________________
    Humes, J.*
    We concur:
    _________________________
    Reardon, Acting P.J.
    _________________________
    Rivera, J.
    * Presiding Justice of the Court of Appeal, First Appellate District, Division One,
    assigned by the Chief Justice pursuant to article VI, section 6 of the California
    Constitution.
    45