Rominger v. County of Colusa , 177 Cal. Rptr. 3d 677 ( 2014 )


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  • Filed 9/9/14
    CERTIFIED FOR PUBLICATION
    IN THE COURT OF APPEAL OF THE STATE OF CALIFORNIA
    THIRD APPELLATE DISTRICT
    (Colusa)
    ----
    ELAINE ROMINGER et al.,                                          C073815
    Plaintiffs and Appellants,               (Super. Ct. No. CV23899)
    v.
    COUNTY OF COLUSA et al.
    Defendants and Respondents;
    ADAMS GROUP INC.,
    Real Party in Interest and Respondent.
    APPEAL from a judgment of the Superior Court of Colusa County, Jeffrey A.
    Thompson, Judge. Affirmed in part and reversed in part.
    Kronick, Moskovitz, Tiedemann & Girard, Jonathan P. Hobbs, Mona G. Ebrahimi
    and Leslie Z. Walker, for Plaintiffs and Appellants.
    1
    Stoel Rives, Timothy M. Taylor, Kristen T. Castanos, Juliet H. Cho for
    Defendants, Respondents and Real Party in Interest.
    In this mandamus action under the California Environmental Quality Act (CEQA;
    Pub. Resources Code,1 § 21000 et seq.), plaintiffs Elaine and Gerald Rominger
    challenged a mitigated negative declaration approved by defendant Colusa County with
    respect to a subdivision proposed by real party in interest Adams Group Inc. The trial
    court denied the Romingers’ petition based on the conclusion that, notwithstanding the
    county’s approval of a mitigated negative declaration, the county’s “action in approving
    the subdivision map was not a project for CEQA purposes and [thus] no review beyond
    the preliminary review stage was required.”
    On the Romingers’ appeal, we conclude the trial court erred in determining the
    proposed subdivision was not a CEQA project, even though the proposal did not include
    any specific plans for development. On our independent review of the Romingers’ other
    complaints, however, we find merit in only one. Specifically, we conclude that the
    Romingers adequately showed there is substantial evidence in the record that the
    subdivision may have a significant unmitigated impact on traffic at a particular
    intersection adjacent to the project site. Accordingly, on that basis only, we will reverse
    and remand for the preparation of an environmental impact report (EIR).
    FACTUAL AND PROCEDURAL BACKGROUND
    The present action pertains to four adjacent parcels in Colusa County consisting of
    a total of just over 159 acres that are bordered by County Line Road to the south, Grevie
    Road to the east, the Southern Pacific Railroad right-of-way to the west, and agricultural
    1      All further section references are to the Public Resources Code unless otherwise
    noted. We will refer to the CEQA statutes in the format CEQA section ____ or (CEQA,
    § ____).
    2
    land to the north. (We will refer to the four parcels jointly as the Adams property or the
    project site.) County Line Road intersects Interstate 5 just to the west of the property.
    In 2001, the county approved an amendment to its general plan changing the
    general plan land use designation for the Adams property from agricultural-industrial to
    industrial and to its zoning ordinance changing the zoning designation from exclusive
    agriculture to industrial. In connection with that action, the county certified a mitigated
    negative declaration. Gerald Rominger challenged the county’s action under CEQA, and
    the parties eventually settled that lawsuit while it was on appeal, with the county agreeing
    to prepare, circulate, and adopt a revised initial study/mitigated negative declaration
    incorporating supplemental mitigation.
    On May 26, 2009, real party in interest Adams Group Inc. filed an application for
    approval of a tentative subdivision map to divide the four existing parcels into 16 parcels
    ranging in size from 1.19 acres to 30.80 acres “for future expansion where separate
    financing may be needed.”2 At the time of the application, 93 acres were in agricultural
    production with the remaining 66 acres of the site occupied by agricultural related light
    industrial uses and ancillary undeveloped land, including a 11.44-acre detention pond at
    the northeast corner of the site. The existing agricultural related light industrial
    operations were accessed by a paved road extending into the site from Grevie Road.
    The subdivision application indicated that no specific plan for future expansion
    was then available and that the intention was to continue the existing use of the property
    at that time. An attachment to the application described the property as “currently
    devoted [to] agriculture related industry,” with “a portion of said property devoted to
    2      The application identified the owner of the property as “William & Janice Adams
    Group, Inc.” This is presumably the same entity as the real party in interest identified in
    the pleadings in this case: Adams Group Inc.
    3
    agriculture production,” and the surrounding properties as “devoted to agriculture
    production with one homesite and shop to the north and Interstate 5 to the west.”
    In January 2010, the county hired a consultant to prepare an initial study. The
    initial study was completed in June 2010 and recommended proceeding by way of a
    mitigated negative declaration. The study determined that the project would potentially
    have a significant environmental impact on cultural resources, but that impact could be
    mitigated to less than significant through mitigation measures.
    In July 2010, the county noticed a public hearing for September 13 regarding
    adoption of the mitigated negative declaration, following a public comment period from
    July 12 to August 11. During the public comment period, the Romingers submitted
    comments requesting that the county proceed by way of an EIR rather than a mitigated
    negative declaration. The Romingers contended the mitigated negative declaration was
    “legally deficient in a number of areas, including an inadequate project description, a
    failure to recognize conflicts with the County’s General Plan, and a failure to properly
    analyze and mitigate for impacts to areas such as agricultural resources, traffic, odor,
    noise, and water supply.” Among other things, the Romingers complained that “no future
    use [wa]s analyzed” and “even if the exact use is yet to be determined, the County must
    analyze the potential impacts of the operations based on the most reasonable significant
    impacts. [Citation.] Since the types of permissible uses in the Industrial zoning
    designation have been specified in the County’s Municipal Code, it is both reasonable
    and feasible for the County to analyze environmental impacts from these activities.” The
    Romingers further argued that the county’s “fail[ure] to consider the environmental effect
    of the foreseeable future industrial use and development” would result in the improper
    “ ‘piece-meal[ing]’ ” of the project.
    As a result of the Romingers’ comments, the county determined that a water
    supply assessment was needed. Accordingly, the county cancelled the public hearing on
    the original mitigated negative declaration. Thereafter, in September 2010, the
    4
    Romingers submitted additional comments on the proposed mitigated negative
    declaration, asserting that it “failed to adequately analyze air quality, odors, greenhouse
    gas emissions, and noise.”
    A revised initial study was completed by August 2011. Like the original study,
    the revised initial study recommended proceeding by way of a mitigated negative
    declaration. The study determined that the project would potentially have significant
    environmental impacts on air quality, cultural resources, and hydrology/water quality, but
    those impacts could be mitigated to less than significant through mitigation measures.
    On August 1, 2011, the county noticed a public hearing before the planning
    commission on the proposed revised mitigated negative declaration for “September 12,
    2011, at 9:00 a.m. in the Board of Supervisors Chambers in the Historic Courthouse,
    located at 547 Market Street, Colusa.” The notice stated that the public comment period
    would be “from August 7, 2011 to September 5, 2011 at 5:00 p.m.”
    As later explained in an agenda report for the board of supervisors, the revised
    initial study and mitigated negative declaration “evaluate[d] the impacts of potential
    development that m[ight] be triggered by the subdivision[], including development to
    facilitate access to and drainage for the newly created parcels, and potential future
    development of a reasonable development scenario.” The report took the position that
    because “[t]he future development scenario [wa]s presented for analysis only, and [wa]s
    not currently proposed,” “the analysis . . . completed by the County . . . actually [wa]s not
    required by CEQA.” The report further explained as follows: “Based upon available
    building permit evidence, grading permit record, and visual evidence along the I-5
    corridor, it is reasonable to expect that agriculture-related industries will develop on the
    project site. This projection is based on: a) existing industrial development on the
    project site is agriculturally related; [and] b) County Planning staff performed a records
    search, zoning map review, and field survey of properties along the 1-5 corridor, and
    found that development on industrially zoned properties consists of agriculture-related
    5
    industries. Although a range of non-agriculture industrial uses are permitted in the M
    zone, the establishment of these uses is considered unlikely due to the geographical
    location of Colusa County, the building permit history and pattern, the location of natural
    resources, and market locations. For each of these reasons, a reasonable future
    development scenario that assumes agriculturally-related industrial development is
    analyzed in the County’s [mitigated negative declaration].”
    During the public comment period, the Romingers submitted a letter that reiterated
    the concerns they had previously expressed, asserted defects in the notices of the public
    hearing and in the close of public comment period, and also detailed additional
    complaints about the proposed mitigated negative declaration.
    Notwithstanding the Romingers’ complaints, the planning commission voted to
    approve the revised mitigated negative declaration for the project. The Romingers
    appealed that determination to the board of supervisors. The board of supervisors heard
    the Romingers’ appeal in February 2012. The board denied the appeal and in March
    2012 adopted a resolution approving the project and the revised mitigated negative
    declaration.
    In April 2012, the Romingers commenced the present action by filing a petition
    for writ of mandate asserting that the county had violated CEQA by “failing to prepare an
    [EIR] for the Project, preparing a deficient mitigated negative declaration . . . for the
    Project, adopting insufficient mitigation measures, providing inadequate public review of
    the [mitigated negative declaration], and approving the Project on the basis of findings
    that are not supported by substantial evidence.” In response, the county and the real party
    in interest argued (among other things) that the county “actually exceeded the
    requirements of CEQA by preparing a [mitigated negative declaration] for a Project that
    has no potential to result in any physical change in the environment.”
    The trial court determined that even though the county had treated the activity as a
    project for purposes of CEQA by preparing a mitigated negative declaration, that did not
    6
    preclude the court from determining that the project was not a project for purposes of
    CEQA. The court then proceeded to make that determination, as follows:
    “Here, the same tract was previously the subject of a general plan revision and
    rezoning. At the time those actions were taken the [Romingers] brought legal action
    under CEQA to challenge the agency process. That prior dispute resolved by formal
    agreement between the parties after which time the current zoning and general plan
    provisions were put in place.
    “Now, [the Romingers] challenge the partition of that same property on the basis
    that the partition will negatively impact the environment by rendering more likely the
    ultimate development of the tract in question. The record provides no substantial
    evidentiary support for such a conclusion. [The Romingers’] position that reduced parcel
    size will lead to accelerated development and development of a more intensive character
    is sheer speculation. One could as easily posit that a larger industrial tract would be more
    attractive to development since industrial complexes often require substantial acreage to
    accommodate their purposes.
    “Accordingly, this court finds that County’s action in approving the subdivision
    map was not a project for CEQA purposes and that no review beyond the preliminary
    review stage was required.”
    From the resulting judgment denying their mandamus petition in March 2013, the
    Romingers timely appealed.
    DISCUSSION
    I
    The County Is Not Barred From Asserting That The Adams Subdivision
    Is Not A CEQA Project Or Is Subject To The Common Sense Exemption From CEQA
    The Romingers argue that because the county treated the Adams subdivision as a
    CEQA project at the administrative level -- approving a mitigated negative declaration
    that identified potential environmental impacts -- the county should be “barred” from
    7
    asserting in court that the subdivision is not a CEQA project or is subject to the common
    sense exemption from CEQA. We disagree because the Romingers’ argument is based
    on a false premise.
    Although the county, in approving a mitigated negative declaration for the
    subdivision, acted under the provisions of CEQA, the county always took the position
    that what it was doing was not required by CEQA. Specifically, the board of supervisors
    found that “[t]he environmental analysis was conducted to provide public information
    about impacts that could occur if a reasonable development scenario were to be pursued,”
    but “[t]he analysis is informational and not required pursuant to CEQA or local statute.”
    Thus, it was the county’s position that it was gratuitously conducting a CEQA analysis of
    the subdivision when the law did not actually require it, because the subdivision either
    did not qualify as a CEQA project or was subject to the common sense exemption from
    CEQA. When the county’s arguments are viewed in this light, it can be seen that the
    county is not arguing that what it did at the administrative level was wrong, just that it
    was not legally required by CEQA.3
    The Romingers have offered us no persuasive reason why the county should be
    barred from asserting that the environmental review it conducted was more than what
    was legally mandated. In fact, if the county were correct on this point, it would serve no
    purpose for the courts to spend valuable time and resources reviewing whether a purely
    voluntary environmental review complied with legal provisions that did not actually
    mandate that review. The task of the courts under CEQA is “ ‘to review the agency’s
    actions to determine whether the agency complied with procedures required by law.’ ”
    (Davidon Homes v. City of San Jose (1997) 
    54 Cal.App.4th 106
    , 113, italics added.) The
    3      On appeal, the county and the real party in interest are represented by the same
    attorneys and filed a joint brief; thus, when we refer to the county’s arguments on appeal,
    we are also referring to the arguments of the real party in interest.
    8
    county’s argument here is that its actions complied with procedures required by law
    because the law required no procedures, and thus everything the county did went “above
    and beyond the requirements of law.” We conclude the county is not barred from making
    this argument. Thus, notwithstanding its preparation of a mitigated negative declaration,
    the county is entitled to argue before this court that the Adams subdivision either did not
    qualify as a CEQA project or was subject to the common sense exemption from CEQA.
    As will be seen, however, those arguments are to no avail.
    II
    The Adams Subdivision Qualifies As A CEQA Project
    “CEQA and its implementing administrative regulations . . . establish a three-tier
    process to ensure that public agencies inform their decisions with environmental
    considerations. [Citation.] The first tier is jurisdictional, requiring that an agency
    conduct a preliminary review to determine whether an activity is subject to CEQA.
    [Citations.] An activity that is not a ‘project’ as defined in the Public Resources Code
    (see § 21065) and the CEQA Guidelines (see § 15378) is not subject to CEQA.” (Muzzy
    Ranch Co. v. Solano County Airport Land Use Com. (2007) 
    41 Cal.4th 372
    , 379-380, fn.
    omitted (Muzzy Ranch).)
    “Whether an activity constitutes a project subject to CEQA is a categorical
    question respecting whether the activity is of a general kind with which CEQA is
    concerned, without regard to whether the activity will actually have environmental
    impact. Thus, for CEQA’s purposes, ‘ “[p]roject” means an activity which may cause
    either a direct physical change in the environment, or a reasonably foreseeable indirect
    physical change in the environment, and which is any of the following: [¶] (a) An
    activity directly undertaken by any public agency. [¶] (b) An activity undertaken by a
    person which is supported, in whole or in part, through contracts, grants, subsidies, loans,
    or other forms of assistance from one or more public agencies. [¶] (c) An activity that
    involves the issuance to a person of a lease, permit, license, certificate, or other
    9
    entitlement for use by one or more public agencies.’ [Citation.] Whether an activity is a
    project is an issue of law that can be decided on undisputed data in the record on appeal.”
    (Muzzy Ranch, 
    supra,
     41 Cal.4th at pp. 381-382.)
    Here, the Romingers contend the trial court erred in finding the Adams
    subdivision was not a CEQA project. In a CEQA case, however, “we review the
    agency’s action, not the trial court’s decision.” (Muzzy Ranch, 
    supra,
     41 Cal.4th at
    p. 381.) Thus, the question for us is not whether the trial court erred, but rather whether
    the subdivision qualifies as a CEQA project as a matter of law, such that the county’s
    environmental review of the subdivision was mandatory under CEQA, rather than
    voluntary as the county asserts. We conclude the subdivision does qualify as a CEQA
    project.
    The Romingers contend the Adams subdivision qualifies as a CEQA project
    because section 21080 specifically provides that CEQA applies to “the approval of
    tentative subdivision maps.” We agree.
    Subdivision (a) of section 21080 provides that “[e]xcept as otherwise provided in
    [CEQA], [CEQA] shall apply to discretionary projects proposed to be carried out or
    approved by public agencies, including, but not limited to, the enactment and amendment
    of zoning ordinances, the issuance of zoning variances, the issuance of conditional use
    permits, and the approval of tentative subdivision maps unless the project is exempt from
    this division.” (Italics added.) According to the Romingers, this statute makes the
    approval of a tentative subdivision map a CEQA project categorically. The county
    responds that “[t]his ignores the facts and elevates form over substance” because “[a]ll
    subdivisions are not born alike,” and “[t]he fact remains that the [Adams] Subdivision . . .
    will not directly or indirectly result in significant impacts to the environment.”
    The answer to the county’s response largely lies in the Supreme Court’s
    recognition in Muzzy Ranch that “[w]hether an activity constitutes a project subject to
    CEQA is a categorical question respecting whether the activity is of a general kind with
    10
    which CEQA is concerned, without regard to whether the activity will actually have
    environmental impact.” (Muzzy Ranch, 
    supra,
     41 Cal.4th at p. 381, italics added.) In
    essence, by enacting subdivision (a) of section 21080 the Legislature has determined that
    certain activities, including the approval of tentative subdivision maps, always have at
    least the potential to cause a direct physical change or a reasonably foreseeable indirect
    physical change in the environment. This makes sense. It virtually goes without saying
    that the purpose of subdividing property is to facilitate its use and development. (See
    Gov. Code, § 66424 [defining “subdivision” for purposes of the Subdivision Map Act as
    “the division, by any subdivider, of any unit or units of improved or unimproved land, or
    any portion thereof, shown on the latest equalized county assessment roll as a unit or as
    contiguous units, for the purpose of sale, lease, or financing, whether immediate or
    future,” italics added].) Presumably no one goes to the trouble of subdividing property
    just for the sake of the process; the goal of subdividing property is to make that property
    more useable. And with the potential for greater or different use comes the potential for
    environmental impacts from that use. Thus, the Romingers are correct that under
    subdivision (a) of section 21080, the approval of a tentative subdivision map is
    categorically a CEQA project.
    This conclusion is supported by our Supreme Court’s analysis in Muzzy Ranch.
    There, the court determined that the adoption of a land use compatibility plan for the area
    around Travis Air Force Base qualified as a CEQA project because it was “the sort of
    activity that may cause a direct physical change or a reasonably foreseeable indirect
    physical change in the environment.” (Muzzy Ranch, supra, 41 Cal.4th at pp. 378, 382.)
    Specifically, the court found that “by freezing residential densities in Compatibility Zone
    C,” the plan might “have the consequence, notwithstanding existing zoning or land use
    planning, of displacing development to other areas of the jurisdiction.” (Id. at pp. 382,
    383.) The court then determined, however, that the adoption of the plan was nonetheless
    exempt from CEQA under the common sense exemption (which we will discuss further
    11
    hereafter) because the plan “simply incorporate[d] existing general plan and zoning law
    restrictions on residential housing density” and thus “any potential displacement the
    [plan] might otherwise have effected already ha[d] been caused by the existing land use
    policies and zoning regulations.” (Id. at p. 389.) Accordingly, while the adoption of the
    plan qualified as a CEQA project because it was the type of activity that might cause a
    physical change to the environment in that it might cause displacement of residential
    development to other areas, the adoption of the plan was exempt from CEQA because in
    fact any such displacement would not be caused by the plan but instead by the existing
    land use policies and zoning regulations the plan incorporated.
    Our Supreme Court’s conclusion in Muzzy Ranch that an activity can qualify as a
    CEQA project because it is of the sort that may cause environmental effects but can, in
    turn, be exempt from CEQA because, in fact, it will not cause any such effects supports
    our conclusion here that whether the approval of the Adams subdivision qualifies as a
    CEQA project must be determined by looking at the activity categorically. Because the
    Legislature has determined in section 21080 that the approval of a tentative subdivision
    map is the sort of activity that may cause physical changes to the environment, the
    Adams subdivision qualifies as a CEQA project.
    III
    The Common Sense Exemption Does Not Apply
    “The second tier [of the CEQA process] concerns exemptions from CEQA review.
    The Legislature has provided that certain projects, such as ministerial projects and repairs
    to public service facilities of an emergency nature, are exempt. [Citations.] In addition,
    pursuant to the Legislature’s command [citation], the CEQA Guidelines list categorical
    exemptions or ‘classes of projects’ that the resources agency has determined to be exempt
    per se because they do not have a significant effect on the environment.
    “A project that qualifies for neither a statutory nor a categorical exemption may
    nonetheless be found exempt under what is sometimes called the ‘commonsense’
    12
    exemption, which applies ‘[w]here it can be seen with certainty that there is no possibility
    that the activity in question may have a significant effect on the environment’ ” (Muzzy
    Ranch, supra, 41 Cal.4th at p. 380.) “[W]hether a particular activity qualifies for the
    commonsense exemption presents an issue of fact, and that the agency invoking the
    exemption has the burden of demonstrating it applies. [Citation.] An agency’s duty to
    provide such factual support ‘is all the more important where the record shows, as it does
    here, that opponents of the project have raised arguments regarding possible significant
    environmental impacts.’ ” (Id. at p. 386.)
    Here, the county contends the Adams subdivision is exempt from CEQA under the
    common sense exemption because it is “a map approval that merely establishes new
    parcel lines” and therefore there is an “absence of any possible effect on the
    environment.” We disagree.
    In applying for approval of the tentative subdivision map, the Adams Group stated
    that its objective was to “[d]ivide [the] existing parcels into 16 separate parcels for future
    expansion where separate financing may be needed.” Thereafter, in response to
    comments by the Romingers, the county itself explained that “[t]he purpose of the project
    is to separate the existing uses on the project site and create lots for lease
    or sale.” (Italics added.) Thus, the record establishes that the purpose of the subdivision
    was to make the property more amenable to development by creating smaller parcels on
    which it would be easier to obtain financing than the existing, larger parcels.
    For the common sense exemption to apply, the county would have to show as a
    factual matter, based on the evidence in the record, that there is no possibility that the
    approval of the Adams subdivision may result in a significant effect on the environment,
    i.e., that despite the subdivision of the property into smaller parcels to facilitate lease or
    sale, there is no possibility that purpose will be achieved and the creation of the smaller
    parcels will not lead to the development of those parcels and to resulting significant
    environmental effects. The county did not make that showing. On the record before us,
    13
    it remains an eminently reasonable possibility that the creation of smaller parcels that are
    easier to finance will lead to development that might not otherwise occur, and to
    attendant significant effects on the environment. Thus, the common sense exemption
    does not apply.
    IV
    The County Abused Its Discretion In Failing To Provide
    A Full 30-Day Public Review Period For The Mitigated Negative
    Declaration, But No Prejudice Has Been Shown
    The Romingers contend the county failed to provide the mandatory 30-day public
    review period for the mitigated negative declaration and this failure constituted a
    prejudicial abuse of discretion. We agree the county failed to comply with CEQA in this
    regard, but we also conclude that no prejudice from the noncompliance has been shown
    and therefore the noncompliance provides no basis for overturning the county’s decision.
    “The public review period for a proposed negative declaration or proposed
    mitigated negative declaration may not be less than 20 days. If the proposed negative
    declaration or proposed mitigated negative declaration is submitted to the State
    Clearinghouse for review, the review period shall be at least 30 days . . . .” (CEQA,
    § 21091, subd. (b).) The Romingers assert that, pursuant to this provision, the public
    review period required here was 30 days, and the county does not disagree.
    “A notice of intent to adopt a negative declaration or mitigated negative
    declaration shall specify . . . [¶] . . . [¶] (2) [t]he starting and ending dates for the review
    period during which the lead agency will receive comments on the proposed negative
    declaration or mitigated negative declaration. This shall include starting and ending dates
    for the review period.” (Guidelines, § 15072, subd. (g).)4
    4       Hereafter, we will refer to the CEQA Guidelines (Cal. Code Regs., tit. 14, § 15000
    et seq.) in the format Guidelines section ____ or (Guidelines, § ____).
    14
    On August 1, 2011, the county issued a notice of public hearing and intent to
    adopt a mitigated negative declaration for the Adams subdivision that stated the public
    comment period would be “from August 7, 2011 to September 5, 2011 at 5:00 p.m.” The
    notice was posted on a bulletin board at the Colusa County Courthouse on August 5 and
    published in the local newspaper on August 6. On August 4, the county issued a public
    notice of availability/notice of intent identifying the same public comment period. That
    notice was mailed to various interested parties on August 5.
    The Romingers complain that the public review period the county specified in its
    notices was only 29 days long, not the 30 days required by CEQA, because the last day of
    the period -- September 5, 2011 -- was the Labor Day holiday, and under section 12 of
    the Code of Civil Procedure that day is excluded.5 The Romingers rely on Latinos
    Unidos de Napa v. City of Napa (2011) 
    196 Cal.App.4th 1154
     to support the proposition
    that Code of Civil Procedure section 12 applies to the calculation of the public review
    period. The Romingers further argue that the review period was “effectively truncated . .
    . three additional days” because of the three-day Labor Day weekend, during which the
    county offices were closed.
    The county questions the authority for applying section 12 of the Code of Civil
    Procedure here and contends that notwithstanding the public review period specified in
    its notices of intent -- August 7 to September 5 -- it complied with CEQA because “both
    notices indicating the [mitigated negative declaration] was available for review were
    published more than 30 days before the identified close of the comment period on
    September 5, 2011” and “the public review remained open through the close of the
    Planning Commission hearing on September 12, 2011.”
    5       “The time in which any act provided by law is to be done is computed by
    excluding the first day, and including the last, unless the last day is a holiday, and then it
    is also excluded.” (Code Civ. Proc., § 12.)
    15
    We begin with the question of whether Code of Civil Procedure section 12
    governs the calculation of the required 30-day public review period. As noted, the
    Romingers rely on Latinos Unidos to support their affirmative answer to that question.
    We find Latinos Unidos distinguishable.
    Latinos Unidos involved the CEQA requirement that “[a] notice of determination
    [NOD] filed with the county clerk shall be available for public inspection and shall be
    posted within 24 hours of receipt for a period of at least 30 days.” (Guidelines, § 15094,
    subd. (e).) In that case there was “substantial evidence that the NOD . . . was posted over
    the course of 31 consecutive days, from 10:00 a.m. on June 17, 2009, until at least 10:00
    a.m. on July 17, 2009.” (Latinos Unidos de Napa v. City of Napa, supra, 196
    Cal.App.4th at p. 1160.) The plaintiff contended that period was insufficient to comply
    with the 30-day requirement because the period of posting should be calculated pursuant
    to Code of Civil Procedure section 12. (Latinos Unidos, at p. 1160.) The appellate court
    agreed, noting that “Code of Civil Procedure section 12 sets forth ‘the ordinary rule of
    computation of time’ ” and that “ ‘[a]bsent a compelling reason for a departure, this rule
    [(Code Civ. Proc., § 12)] governs the calculation of all statutorily prescribed time
    periods.’ ” (Latinos Unidos, at p. 1161.)
    It is true the statutory command at issue here (“the review period shall be at least
    30 days” (CEQA, § 21091, subd. (b))) is similar to the command of the Guidelines at
    issue in Latinos Unidos (“[a] notice of determination . . . shall be posted . . . for a period
    of at least 30 days”). (Guidelines, § 15094, subd. (e).) There is a critical difference
    between the two situations however. That difference is that here, with respect to the
    public review period, the Guidelines specifically provide that “[a] notice of intent to
    adopt a negative declaration or mitigated negative declaration shall specify . . . [¶] . . . [¶]
    (2) [t]he starting and ending dates for the review period during which the lead agency
    will receive comments on the proposed negative declaration or mitigated negative
    declaration. This shall include starting and ending dates for the review period.”
    16
    (Guidelines, § 15072, subd. (g).) This provision essentially serves the same purpose that
    Code of Civil Procedure section 12 would otherwise serve, which is to provide certainty,
    “so that the method of computing time not be a source of doubt or confusion.” (In re
    Anthony B. (2002) 
    104 Cal.App.4th 677
    , 682.)
    In a case like Latinos Unidos, where the time period in question runs from the
    performance of a specific act -- i.e., posting a notice -- Code of Civil Procedure section
    12 provides certainty by letting the public know that the 30-day posting period begins the
    day after the notice was first posted and ends 30 days later, unless that day is a holiday, in
    which case it ends 31 days later. In a case like the one before us, however, that same
    certainty is provided by the specific dates set forth in the notice that is made available to
    the public by letting the public know the exact 30-day period during which “copies of the
    proposed negative declaration or mitigated negative declaration . . . and all documents
    referenced in the proposed negative declaration or mitigated negative declaration [will
    be] available for review” (Guidelines, § 15072, subd. (g)(4)) and during which the lead
    agency will receive comments on the proposed negative declaration or mitigated negative
    declaration. Where, as here, the public notice has actually been provided before the
    commencement of the public review period,6 there is no need to invoke Code of Civil
    Procedure section 12 to avoid doubt or confusion because the notice gives the public
    advance notice of the 30-day period during which the pertinent documents will be
    available for review and during which the lead agency will receive comments.
    Accordingly, we conclude that Code of Civil Procedure section 12 did not apply here.
    6       At the very least, the notice published in the local newspaper on August 6 satisfied
    Guidelines section 15072, subdivision (b)(1). The mailing on August 4 may also have
    satisfied Guidelines section 15072, subdivision (b)(3), but whether it did or not is
    immaterial given the timely newspaper publication of the notice.
    17
    That does not mean, however, that the county complied with CEQA, because it
    remains true that the last three days of the 30-day public review period of which the
    county gave notice fell on the Labor Day weekend. Because the county offices were
    closed on those three days, the Romingers are correct that the county effectively
    truncated the public review period by three days. No one could have gone to the county
    offices on September 3, 4, or 5 to review the pertinent documents or to submit comments
    on the proposed mitigated declaration. Thus, under the circumstances here, the county
    effectively provided only a 27-day public review period, which did not comply with
    CEQA.
    Obviously, we are not concluding that the lead agency’s offices must be open, so
    that inspection may occur or comments may be submitted, each and every day of the 30-
    day public review period. Weekends and other holidays falling in the middle of the
    public review period still count toward the 30 days required. However, the end of the
    public review period cannot fall on a day when the lead agency’s offices are closed
    without effectively making the period shorter than CEQA requires. Thus, while the
    counting begins with the starting date described in the notice pursuant to section
    15072(g) of the CEQA Guidelines, if the ending date described in the notice falls on a
    weekend or other legal holiday, when the lead agency’s offices are closed, then the
    noticed public review period is legally insufficient if that ending date is, as here, the 30th
    day of the period. For the noticed public review period to comply with CEQA, if the
    ending date is the 30th day, that date must be a date when the lead agency’s offices are
    open.7
    7      If the lead agency notices a public review period that is longer than 30 days, that
    period may nonetheless be legally sufficient even if the closing date falls on a weekend or
    other holiday as long as the 30th day of the period falls on a date when the lead agency’s
    offices are open.
    18
    The county’s arguments that it complied with CEQA because “both notices
    indicating the [mitigated negative declaration] was available for review were published
    more than 30 days before the identified close of the comment period on September 5,
    2011” and “the public review remained open through the close of the Planning
    Commission hearing on September 12, 2011” are to no avail because section 15072 of
    the CEQA Guidelines requires the lead agency to specify the exact dates of the public
    review period in its notice. Here, the county identified a period from August 7 to
    September 5 -- a period we have concluded was three days too short because the last
    three days did not count. The county cannot now claim that it actually provided a legally
    sufficient 30-day public review period because its notices were published prior to August
    7 and because it would have continued to accept comments from the public up through
    the hearing on September 12. The period that must comply with CEQA is the period
    specified in the notice given to the public. Here, as we have said, that period did not
    comply with CEQA.
    In a CEQA case, our review extends “only to whether there was a prejudicial
    abuse of discretion. Abuse of discretion is established if the agency has not proceeded in
    a manner required by law or if the determination or decision is not supported by
    substantial evidence.” (CEQA, § 21168.5.) By failing to provide a full 30-day public
    review period, the county did not proceed in the manner required by law and thereby
    abused its discretion. The question that remains is whether that abuse of discretion was
    prejudicial.
    “ ‘Noncompliance with CEQA’s information disclosure requirements is not per se
    reversible; prejudice must be shown.’ ” (Sunnyvale West Neighborhood Assn. v. City of
    Sunnyvale City Council (2010) 
    190 Cal.App.4th 1351
    , 1384-1385.) “[N]oncompliance
    with the information disclosure provisions of [CEQA] which precludes relevant
    information from being presented to the public agency . . . may constitute a prejudicial
    abuse of discretion within the meaning of Sections 21168 and 21168.5, regardless of
    19
    whether a different outcome would have resulted if the public agency had complied with
    those provisions.” (CEQA, § 21005, subd. (a).) However, “[i]nsubstantial or merely
    technical omissions are not grounds for relief.” (Neighbors for Smart Rail v. Exposition
    Metro Line Construction Authority (2013) 
    57 Cal.4th 439
    , 463.)
    Under the foregoing authorities, the Romingers are correct in asserting that
    traditional “ ‘harmless error analysis is inapplicable’ ” here. They are incorrect, however,
    in asserting that just “[b]ecause the County failed to comply with a mandatory
    requirement of CEQA, . . . ‘the error is prejudicial’ as a failure to proceed as required by
    law.” Saying that traditional harmless error analysis does not apply means only that the
    Romingers do not have to show that the county would have reached a different
    conclusion regarding the project if the county had provided a 30-day public review period
    rather than the 27-day review period actually provided. At the same time, however, it is
    clear that because “there is no presumption that error is prejudicial” (CEQA, § 21005,
    subd. (b)), we cannot conclude that the Romingers are entitled to relief simply because
    the county failed to comply with CEQA. Thus, the Romingers’ reliance on Resource
    Defense Fund v. Local Agency Formation Com. (1987) 
    191 Cal.App.3d 886
    , 898 for the
    principle that “[f]ailure to comply with the CEQA procedures is necessarily prejudicial”
    is misplaced as that statement does not comport with either CEQA section 21005 or with
    the Supreme Court’s decision in Neighbors for Smart Rail. Instead, we must look at the
    nature of the county’s noncompliance to determine if it was of the sort that “preclude[d]
    informed decisionmaking and informed public participation.” (Neighbors for Smart Rail
    v. Exposition Metro Line Construction Authority, supra, 57 Cal.4th at p. 463.)
    On the record here, we conclude no prejudice has been shown from the truncated
    public review period. The Romingers point to no evidence in the record that anyone who
    wanted to was prevented from reviewing the pertinent documents or from submitting
    comments on those documents because the last three days of the public review period
    coincided with the Labor Day weekend. Certainly no one appeared at the public hearing
    20
    to complain that this coincidence prevented them from participating in the review and
    comment process. At best, the Romingers assert that they “have no idea what would
    have occurred had the County provided the required notice.” This necessarily means it is
    possible that nothing different would have occurred if the county had noticed the end of
    the public review period for September 6 -- the day after Labor Day -- rather than for
    September 5. To conclude under these circumstances that the county’s error justifies
    overturning the county’s decision would amount to presuming prejudice, which we
    cannot do.
    On the record before us, we conclude that the county’s error in setting the public
    review period for the proposed mitigated negative declaration was not prejudicial and
    does not provide a basis for relief in this action.
    V
    The Romingers Have Failed To Show That Any Other Defects
    In the County’s Notices Were Prejudicial
    The Romingers contend the county’s notices were defective because they were
    confusing, misleading, and contained incorrect hearing times, and these defects were
    prejudicial as a matter of law. We conclude that even if the county abused its discretion
    in any of these regards, the Romingers have failed to show prejudice and therefore are not
    entitled to any relief as a result of any such defects.
    The notice of public hearing and intent to adopt a mitigated negative declaration
    for the Adams subdivision that the county issued on August 1, 2011, and that was
    published in the local newspaper on August 7 specified that “Colusa County Planning
    Commission will conduct a public hearing on September 12, 2011, at 9:00 a.m. in the
    Board of Supervisors Chambers in the Historic Courthouse, located at 547 Market Street,
    Colusa, and will make a recommendation to the Board of Supervisors.” (Bolding
    omitted.) The public notice of availability/notice of intent the county issued on August 4
    and mailed to various interested parties on August 5 specified that the time of the hearing
    21
    was 1:30 p.m. On September 6, however, the county mailed a corrected public notice of
    availability/notice of intent showing the time of the hearing as 9:00 a.m.
    The Romingers complain that the August 1 notice was “misleading” because the
    planning commission did not actually make a recommendation to the board of
    supervisors but instead “took action to approve the [mitigated negative declaration] and
    the Project,” requiring the Romingers “to affirmatively appeal the Planning Commission
    decision to the Board of Supervisors, pay an appeal fee, and seek to overturn a decision,
    rather than argue against a non-final recommendation.” They further complain that the
    August 4 notice listed an incorrect hearing time and the corrected notice mailed on
    September 6 was not mailed sufficiently prior to the hearing.
    We need not determine whether the “defects” the Romingers have purported to
    identify in the two notices amounted to an abuse of discretion by the county, because
    even if they did, we conclude the Romingers have failed to show that any such abuse of
    discretion was prejudicial. We have explained already that noncompliance with CEQA’s
    information disclosure requirements is not presumed prejudicial. The authorities the
    Romingers cite for the contrary proposition are not persuasive here. Plaggmier v. City of
    San Jose (1980) 
    101 Cal.App.3d 842
    , in which the appellate court treated an error in the
    direct mailing of notice as prejudicial without directly discussing the issue of prejudice
    (see id. at pp. 856-857), predates the enactment of CEQA section 21005 and is
    inconsistent with that statute (discussed above). Sounhein v. City of San Dimas (1992) 
    11 Cal.App.4th 1255
     involved “the complete omission of any public notice or hearings,”
    which the appellate court concluded “was not a mere minor technical defect” but instead
    constituted a fundamental flaw in the process of adopting a zoning ordinance. (Id. at p.
    1260.) Here, by contrast, there was at most a misidentification of the hearing time in one
    of two notices and an inaccurate description of the planning commission’s role in the
    process. The Romingers fail to show why these are not most reasonably characterized as
    insubstantial or merely technical errors under Neighbors for Smart Rail.
    22
    Finally, the Romingers cite Horn v. County of Ventura (1979) 
    24 Cal.3d 605
    , 617,
    which (as relevant in this case) holds only that “where, as here, prior notice of a
    potentially adverse decision is constitutionally required, that notice must, at a minimum,
    be reasonably calculated to afford affected persons the realistic opportunity to protect
    their interests.” The Romingers fail to show how the minor “defects” they have
    identified in the two notices issued here deprived any affected persons the realistic
    opportunity to protect their interests. The closest the Romingers come to making such a
    showing is their argument that “at least one member of the public . . . missed the Planning
    Commission meeting by appearing at 1:30 p.m., when the meeting had already started at
    9:00 a.m. and concluded that morning.” The evidence the Romingers cite, however,
    shows that this individual communicated to the board of supervisors, in advance of the
    hearing on the Romingers’ appeal, the information he indicated he would have presented
    to the planning commission. The Romingers assert that “[t]here is no way to know what
    impact [this individual]’s testimony might have had on the Planning Commission or what
    would have occurred had the County provided proper notice,” but this assertion achieves
    nothing for two reasons. First, it implicitly concedes that there might have been no
    impact from the individual’s testimony, which means the Romingers are again in the
    position of arguing a presumption of prejudice, which the law does not permit. And
    second, because the Romingers appealed the planning commission’s decision to the board
    of supervisors, and because this individual was able to express his views to the board
    during that process, it is not material what the planning commission might have done.
    Under the circumstances here, the Romingers have failed to show that the “defects” in the
    county’s notices precluded informed decisionmaking and informed public participation.
    Accordingly, any abuse of discretion was not prejudicial.
    23
    VI
    The Mitigated Negative Declaration Did Not Fail
    To Analyze The “Whole” Of The Project
    The Romingers contend that by failing to consider various reasonably foreseeable
    activities that could occur as a result of the development of the subdivided property, the
    county improperly failed to analyze the “whole” of the project. We disagree. The
    mitigated negative declaration analyzed the reasonable scenario that agriculturally-related
    industrial development will occur on the subdivided property. To the extent the
    Romingers complain that certain specific “permitted uses” -- including “food or plastic
    processing plants or truck terminals” -- “could develop on the newly subdivided land
    without any environmental review” and thus the county’s failure to analyze those
    particular uses amounted to a prejudicial abuse of discretion, we find no merit in that
    complaint. The question is whether the unanalyzed uses are a “reasonably foreseeable
    consequence” of the Adams subdivision and whether “the future . . . action will be
    significant in that it will likely change the scope or nature of the initial project or its
    environmental effects.” (Berkeley Keep Jets Over the Bay Com. v. Board of Port Cmrs.
    (2001) 
    91 Cal.App.4th 1344
    , 1360.) But the Romingers do not point to any evidence in
    the record that these particular uses are a reasonably foreseeable consequence of the
    subdivision, nor do they show how the impacts of these uses would vary significantly
    from the general agriculturally-related industrial development the mitigated negative
    declaration analyzed. Under these circumstances, no impermissible piecemealing of the
    project has been shown.
    24
    VII
    A Mitigated Negative Declaration Was Inappropriate Here
    Because There Is Substantial Evidence In The Record To Support A Fair Argument
    That The Project May Have Significant Unmitigated Impacts On Traffic
    “CEQA excuses the preparation of an EIR and allows the use of a negative
    declaration when an initial study shows that there is no substantial evidence that the
    project may have a significant effect on the environment. [Citation.]
    “If the initial study identifies potentially significant effects on the environment but
    revisions in the project plans ‘would avoid the effects or mitigate the effects to a point
    where clearly no significant effect on the environment would occur’ and there is no
    substantial evidence that the project as revised may have a significant effect on the
    environment, a mitigated negative declaration may be used. [Citation.] As the state
    Office of Planning and Research discussion following Guidelines section 15070 explains:
    ‘A Mitigated Negative Declaration is not intended to be a new kind of document. . . . [¶]
    [It] provides efficiencies in the process where the applicant can modify his project to
    avoid all potential significant effects. The applicant can avoid the time and costs
    involved in preparing an EIR and qualify for a Negative Declaration instead. The public
    is still given an opportunity to review the proposal to determine whether the changes are
    sufficient to eliminate the significance of the effects.’ ” (San Bernardino Valley Audubon
    Society v. Metropolitan Water Dist. (1999) 
    71 Cal.App.4th 382
    , 389-390.)
    “ ‘A trial court . . . reviews an agency’s decision to adopt a negative declaration
    using the “fair argument” test. Under this test, the agency must prepare an EIR whenever
    substantial evidence in the record supports a fair argument that a proposed project may
    have a significant effect on the environment. [Citations.] “If such evidence is found, it
    cannot be overcome by substantial evidence to the contrary.” ’ [Citation.] ‘ “ ‘Stated
    another way, the question is one of law, i.e., “the sufficiency of the evidence to support a
    fair argument.” [Citation.] Under this standard, deference to the agency’s determination
    25
    is not appropriate and its decision not to require an EIR can be upheld only when there is
    no credible evidence to the contrary . . . .’ Thus, the applicable standard of review
    appears to involve a question of law requiring a certain degree of independent review of
    the record, rather than the typical substantial evidence standard which usually results in
    great deference being given to the factual determinations of an agency.” ’ [Citation.]
    Thus, we conduct our review independent of the trial court’s findings.” (Baldwin v. City
    of Los Angeles (1999) 
    70 Cal.App.4th 819
    , 841-842.)
    Here, the Romingers contend the county prejudicially abused its discretion in
    failing to prepare an EIR rather than a mitigated negative declaration because the record
    contains substantial evidence supporting a fair argument that the Adams subdivision may
    have significant environmental impacts in a number of areas notwithstanding the
    mitigation measures contained in the mitigated negative declaration. According to the
    Romingers, the areas in which those significant impacts may occur are: (1) agriculture,
    (2) traffic, (3) odor, (4) noise, (5) air quality, (6) greenhouse gas emissions, and (7) water
    supply. Addressing each area in turn, we conclude the Romingers’ arguments have merit
    only in the area of traffic.
    A
    Agriculture
    In determining that the Adams subdivision will not have a significant impact on
    agricultural farmland, the county applied the following standard of significance:
    “The loss or conversion of agricultural land within Colusa County shall be
    determined to be significant if the following conditions are met:
    “• The land is designated as Prime Farmland, Unique Farmland, or Farmland of
    Statewide Importance AND is designated by the Colusa County General Plan
    OR Colusa County Zoning Ordinance as Agricultural land.
    “• The land is under an active Williamson Act Contract.”
    26
    The county explained that “[a]lthough a portion of the proposed project site is
    designated as Prime Farmland by the California Department of Conservation it is not
    designated by the Colusa County General Plan or Colusa County Zoning Ordinance for
    agricultural use. The County previously analyzed the impacts of designating the project
    site and surrounding vicinity from Exclusive Agriculture (E-A) to Industrial (M) in the
    Mitigated Negative Declaration prepared for the project, ‘Ratification of Amendments to
    the Colusa County General Plan (#00-10-1) and Zoning Ordinance. (#00-10-1)’, State
    Clearinghouse #2004129037. In the previously adopted document, the County
    determined the impacts of redesignating the land to industrial uses as less than significant
    because the redesignation resulted in a loss of 0.00016 percent of the Prime
    Farmland in Colusa County. Additionally the proposed project site is not under an active
    Williamson Act Contract.” The county then concluded as follows: “Although the
    proposed project site is partially designated as Prime Farmland, it is not under a
    Williamson Act Contract, or designated by the Colusa County General Plan or Colusa
    County Zoning Ordinance for agricultural use. According to Colusa County’s standard
    of significance the proposed project will have a less than significant impact on
    agricultural re[s]our[c]es.”
    The Romingers’ challenge to this aspect of the mitigated negative declaration has
    two aspects. First, they question the county’s right to apply a standard of significance
    different from the standards found in the sample checklist for an initial study contained in
    appendix G of the Guidelines. Second, they contend the county cannot rely on its prior
    analysis as part of the 2004 general plan amendment and rezone. Essentially they
    contend that notwithstanding the application of what they characterize as the county’s
    “artificially low threshold” of significance, and notwithstanding the county’s earlier
    analysis in the mitigated negative declaration for the general plan amendment and
    rezoning, the Adams subdivision may have a significant impact on agricultural resources
    27
    because the development of the property will “likely result in the conversion of up to 113
    acres of Prime Farmland to non-agricultural use.”
    We begin with the Romingers’ challenge to the county’s standard of significance.
    Effectively, the county’s standard treats the loss or conversion of agricultural land within
    the county as significant only if the land is designated as prime farmland, unique
    farmland, or farmland of statewide importance and is designated by the Colusa County
    general plan or the Colusa County zoning ordinance as agricultural land, or the land is
    under an active Williamson Act contract. Because the land at issue here is not under an
    active Williamson Act contract and is zoned for industrial use, the county considers the
    loss of this farmland less than significant.
    The Romingers effectively contend that the county abused its discretion by using
    its own standard of significance because that standard is (in the Romingers’ eyes)
    inconsistent with the standard of significance on the same subject contained in
    appendix G of the Guidelines. “[A]ppendix G of the Guidelines, ‘Environmental
    Checklist Form’ . . . . , along with appendix H ‘Environmental Information Form,’ is
    designed to be used as an initial study to determine if a project may have a significant
    effect on the environment. (See Guidelines, § 15063, subds. (a) & (f).) The checklist
    consists of sample questions divided into categories of potential physical impacts a
    project may have . . . .” (Protect the Historic Amador Waterways v. Amador Water
    Agency (2004) 
    116 Cal.App.4th 1099
    , 1110.) The first question in the checklist under the
    heading “Agricultural Resources” asks whether the project would “Convert Prime
    Farmland, Unique Farmland, or Farmland of Statewide Importance (Farmland), as shown
    on the maps prepared pursuant to the Farmland Mapping and Monitoring Program of the
    California Resources Agency, to non-agricultural use.”
    According to the Romingers, under this standard of significance from appendix G,
    “a project has a significant environmental effect if it converts Prime Farmland to non-
    agricultural use,” which the Adams subdivision would do. But since the county’s
    28
    standard of significance also requires the land in question to be designated by the Colusa
    County general plan or the Colusa County zoning ordinance as agricultural land, which
    the land in question is not, the county’s use of its own standard of significance -- again, in
    the Romingers’ view -- allows the county to avoid a finding of significant effect. Thus,
    the Romingers contend the county’s reliance on its own standard of significance is
    improper.
    The Romingers’ argument is flawed for several reasons. First, the Guidelines
    make clear that the checklist form in appendix G is “only suggested, and public agencies
    are free to devise their own format for an initial study.” (Guidelines, § 15063, subd. (f).)
    Furthermore, “CEQA grants agencies discretion to develop their own thresholds of
    significance (CEQA Guidelines, § 15064, subd. (d)).” (Save Cuyama Valley v. County of
    Santa Barbara (2013) 
    213 Cal.App.4th 1059
    , 1068.) “To require any deviation from [the
    standards of significance in appendix G] to be documented and justified . . . is to elevate
    Appendix G from a suggested threshold to the presumptive threshold. This flatly
    contradicts both CEQA’s description of Appendix G as only suggested and CEQA’s
    mandate that agencies have the power to devise their own thresholds.” (Save Cuyama
    Valley, at p. 1068.)
    The Romingers try to discount Save Cuyama Valley by asserting that “[t]he
    question addressed in th[at] case[] was whether the EIR’s conclusions were supported by
    substantial evidence, not whether there was substantial evidence of a fair argument of an
    impact in the context of a negative declaration.” In other words, the Romingers suggest
    that a lead agency’s discretion to adopt its own standards of significance is more
    restricted if the agency uses its own standard “to support a decision not to prepare an
    EIR” -- at least when application of a corresponding standard of significance from
    appendix G would mandate the contrary decision. But the Romingers offer no authority,
    or even any reasoning, supporting their assertion that the county’s right to adopt its own
    standard of significance was more limited here because of the context in which the
    29
    county used that standard. Absent such support, the Romingers’ assertion is
    unpersuasive.
    Moreover, the Romingers’ argument rests on a fundamental misunderstanding of
    appendix G and the sample questions set forth in the checklist therein. “The person
    filling out the form [in appendix G] can check one of four boxes in response to each
    question: potentially significant impact, potentially significant unless mitigation
    incorporated, less than significant impact, and no impact.” (Protect the Historic Amador
    Waterways v. Amador Water Agency, supra, 116 Cal.App.4th at p. 1110.) Thus, contrary
    to the Romingers’ argument, even under appendix G, a project does not necessarily have
    a significant environmental effect just because “it converts Prime Farmland to non-
    agricultural use.” The sample questions in appendix G are not simply yes-or-no
    propositions. “ ‘ “Potentially Significant Impact” is [the] appropriate [answer] if there is
    substantial evidence that an effect may be significant.’ ” (Amador Waterways, at
    p. 1110.) Thus, even using the checklist in appendix G, a lead agency would have to
    evaluate the evidence to determine whether the conversion of prime farmland to
    nonagricultural use might constitute a significant effect on the environment; such
    conversion is not ipso facto a significant effect, as the Romingers contend. To that
    extent, the Romingers’ challenge to the county’s use of its own standard of significance
    here is without merit because that challenge rests on a misunderstanding and
    misapplication of the standards in appendix G of the Guidelines.
    As for the Romingers’ argument that the county cannot rely on its prior analysis of
    this land as part of the 2004 general plan amendment and rezone, we do not perceive that
    the county’s mention of this prior analysis was material to its conclusion that the Adams
    subdivision would not have a significant effect on agricultural resources because
    applying its standard of significance as it did, the county would have found no significant
    effect regardless of the prior analysis.
    30
    The Romingers contend that “even if a lead agency has discretion in setting
    thresholds of significance, if evidence is presented tending to show an actual
    environmental impact, despite the adopted signfican[ce] standard, the agency cannot
    ignore the impact.” In this regard, the Romingers are correct. (See Protect the Historic
    Amador Waterways v. Amador Water Agency, supra, 116 Cal.App.4th at pp. 1109-1111.)
    A lead agency cannot avoid finding a potentially significant effect on the environment by
    rotely applying standards of significance that do not address that potential effect. (See id.
    at p. 1111.) But the Romingers point to no evidence that that happened here. Here, the
    county applied a standard of significance under which the conversion of prime farmland
    to nonagricultural use is considered less than significant if that land has already been
    designated for nonagricultural use in the county’s general plan or zoning regulations. If
    the Romingers could point to substantial evidence in the record that the conversion of the
    specific 113 acres at issue here might constitute a significant effect on the environment
    notwithstanding the county’s standard of significance, then it is true that the county could
    not avoid its obligation to prepare an EIR by rotely relying on its standard. But the
    Romingers fail to point to any such evidence. Instead, in the end, the Romingers’
    argument rests solely on their misapplication of appendix G and the mistaken proposition
    that the conversion of any prime farmland to nonagricultural use may be considered a
    significant effect, no matter how much land is being converted or how much prime
    farmland remains unconverted.
    The question here is whether, notwithstanding the county’s application of its
    standard of significance regarding the conversion of prime farmland to nonagricultural
    use, the Romingers have raised a fair argument based on substantial evidence that the
    change in the use of the land at issue here may constitute a significant effect on the
    environment, given the evidence that the land is already zoned for industrial use and that
    31
    the amount of farmland at issue is very small when viewed on a county-wide basis.8 We
    conclude that the Romingers have not raised any such argument. Accordingly, their
    challenge to the agricultural resources element of the mitigated negative declaration is
    without merit.
    B
    Traffic
    The initial study analyzed “potential transportation and circulation impacts
    resulting from ultimate development of the proposed project site” and concluded that
    those impacts would be less than significant. The traffic study focused on four
    intersections in the vicinity of the proposed subdivision, including the intersection of Old
    Highway 99 West and County Line Road, which lies at the southwest corner of the
    proposed project.
    Part of the traffic analysis included “project trip generation.” As explained in the
    traffic impact study on which the initial study relied, “[p]roject trip generation is a
    process for estimating the amount of vehicular traffic the proposed project would have on
    the surrounding roadway networks.” The traffic impact study explained that “[t]he
    proposed project trip generation information was based on the proposed action
    information provided by the applicant regarding the tentative subdivision map and an
    adjusted trip generation rate based on the existing agriculture/industrial uses on the
    proposed project in lieu of those traditionally found in the Institute of Transportation
    Engineers (ITE) Trip Generation, 8th Edition.” An adjacent table showed that the
    proposed project trip generation rate used in the traffic analysis was 7.2 trips daily per
    acre, with a trip rate of .60 in the morning peak hour and a rate of .63 in the evening peak
    hour.
    8     The county points to evidence that there are approximately 225,000 acres of prime
    farmland within its boundaries. Only 113 acres are at issue here.
    32
    In support of comments they submitted on the initial study, the Romingers
    produced a letter from a traffic engineer, Daniel Smith, who asserted that the traffic
    analysis in the initial study “relie[d] on an unrealistically low trip generation estimate.”
    Among other things, Smith took issue with the decision to base the projected trip
    generation rate on “existing agriculture/industrial uses on the proposed project in lieu of
    those traditionally found in the Institute of Transportation Engineers (ITE) Trip
    Generation, 8th Edition.” Smith was of the opinion that, “considering the proximity and
    accessibility of the site to Interstate 5 and the fact that agricultural use in the area is fully
    developed or even declining, a more probable assumption is that the proposed parcels
    currently in agricultural use would likely be developed in uses permitted within the
    industrial zoning that would be taking advantage of the site’s freeway accessibility rather
    than being agricultural-serving. As such, they would more likely have trip generation
    characteristics better represented by the categories ‘general light industry’ or ‘heavy
    industry’ in the authoritative trip generation source reference Trip Generation, 8th Edition
    rather than the existing agricultural-support uses on some portions of the site. Moreover,
    the 45+ acres currently developed in agricultural-support light industrial uses could be
    redeveloped as more traffic-intense uses best characterized by the trip rates in Trip
    Generation, 8th Edition than by the rate asserted by the applicant.”
    Smith explained that “[t]rip generation for the 114+ acres of current agricultural
    use on the site that would presumably be redeveloped to industrial use or uses permitted
    in industrial zoning would be vastly greater if compiled according to the rates in Trip
    Generation, 8th Edition rather than those in the [initial study/mitigated negative
    declaration] estimates based on the purported generation of the existing agricultural
    support industry already on site.” Pursuant to the “authoritative publication,” “trip
    generation rates for the category ‘general light industry’ are roughly 10 times higher than
    those assumed in the . . . traffic impact study on a daily basis and 15 times higher on [a
    morning or evening] peak hour basis. The same rough proportions, 10 times higher on a
    33
    daily basis and 15 times higher on [a morning or evening] peak hour basis, [are] also
    indicated for the category ‘industrial park.’ ”
    Smith went on to explain that the greater traffic generated under the projections
    from the Trip Generation publication could potentially have a significant impact on the
    intersection of County Line Road and Old Highway 99 West (also known as State
    Highway 99 or SR 99). According to Smith, “there is a railway grade crossing
    immediately to the east [of the intersection]. . . . Because the limits of the railroad grade
    crossing of County Line Road are only about 150 feet from the limits of [its] intersection
    with SR 99, there is only stacking space for about six passenger vehicles when the grade
    crossing is blocked by trains, and for even fewer vehicles when heavy trucks are in the
    mix, before traffic backs up into the SR 99 intersection. Because the agricultural
    processing facilities between SR 99 and the rail line obscure sight distance to the grade
    crossings for vehicles approaching northbound or southbound on SR 99 that intend to
    turn onto County Line Road eastbound, such vehicles, unaware that the grade crossing is
    blocked, could pile into the rear of the waiting traffic queue.”
    In responding to the foregoing comments, the county’s staff and consultant
    asserted that “[i]t is impossible and would be inaccurate to attempt to quantify all
    potential future development on the project site” and that “[i]f specific development
    proposals are presented which are more intensive than what was analyzed in the
    [mitigated negative declaration] (e.g. would produce traffic trips in excess of those
    calculated in the [traffic impact study]) then the individual project would be subject to its
    own independent CEQA review, and possibly further traffic impact analysis.”
    On appeal, the Romingers contend “[t]he record contains substantial evidence of a
    fair argument of unanalyzed traffic impacts in the form of the expert opinion by a
    qualified traffic engineer who based his conclusions on the [mitigated negative
    declaration] and supporting traffic study” and therefore “[t]he [mitigated negative
    34
    declaration] should be set aside in favor of an EIR.” On this element of the mitigated
    negative declaration, we agree.
    The question here, essentially, is whether Smith’s opinion amounts to substantial
    evidence supporting a fair argument that the Adams subdivision may have a significant
    impact on the environment because of the potential impact of the project on traffic at the
    intersection of Old Highway 99 and County Line Road, as detailed above. In large part,
    the county fails to address this question. For example, the county contends that because
    the landowner “did not initiate any specific development plans associated with [the]
    project application . . . , the County properly (and in good faith) relied on the existing
    agricultural/industrial uses on the proposed project site to ascertain a trip generation
    rate.” This is the equivalent of arguing that there was substantial evidence to support the
    county’s conclusion that the project would not have a significant impact on traffic in the
    area. In fact, the county actually goes on to expressly argue that its “assumptions
    regarding trip generation are supported by substantial evidence.” But that is not the issue
    before us. Whatever the evidence may have been that supported the county’s
    conclusions, we are concerned here with whether there was substantial evidence to
    support a fair argument that the county was wrong and that the project may have a
    significant impact on traffic in the area. As we have previously suggested, we can uphold
    the county’s decision not to require an EIR only if there is no credible evidence that the
    project may have a significant impact. (Baldwin v. City of Los Angeles, supra, 70
    Cal.App.4th at p. 842.)
    To the extent the county addresses the question before us, the county asserts that
    the Romingers’ “conjecture that a different trip generation assumption applies is not
    based on factual evidence.” But it is, because it is based on the opinion of the
    Romingers’ traffic expert as to the likely use of the subdivided property, which the expert
    supported by reference to specific facts, i.e., “the proximity and accessibility of the site to
    Interstate 5 and the fact that agricultural use in the area is fully developed or even
    35
    declining.” The only challenge the county offers to the expert’s opinion is that Smith
    “analyzed the consequences of unknown future development, not of the [Adams]
    Subdivision.” According to the county, “there is nothing in the record to suggest that
    there will, in fact, be ‘general light industrial’ or ‘industrial park’ development on the
    property.” But Smith explained in his letter why it was reasonable to assume that the
    development on the subdivided property will probably not be “agricultural support light
    industry, with traffic generating characteristics similar [to] such uses already on site,” but
    instead will probably be of a sort “more likely [to] have traffic generation characteristics
    better represented by the categories ‘general light industry’ or ‘heavy industry.’ ” For our
    purposes, the question is not whether Smith’s opinion constitutes proof that the greater
    traffic generating industrial development will occur in the subdivision. Rather, the
    question is whether Smith’s opinion constitutes substantial, credible evidence that
    supports a fair argument that such development may occur and that, as a result, the
    greater traffic generated by such development may have a significant impact on the
    environment surrounding the project, and therefore an EIR was required. The answer to
    that question is “yes,” and none of the county’s arguments support a contrary conclusion.
    Accordingly, the county prejudicially abused its discretion when it failed to prepare an
    EIR addressing the potentially significant impact of the project on traffic at the
    intersection of County Line Road and Old Highway 99 West.
    C
    Odor
    The initial study addressed potential odors from the project as follows:
    “The proposed project site is located in a rural area of unincorporated Colusa
    County. The proposed project will [sic] consists of agricultural related industrial
    developments of similar nature to the existing industrial developments located within
    boundary of the proposed project site. The proposed uses are not expected to generate
    significant odorous emissions that could expose a substantial number of people to
    36
    objectionable odors. Nonetheless, because the project’s future land uses are
    undetermined, there is the potential that the project could cause a significant impact. If a
    proposed project is determined to result in potential odor problems, mitigation measures
    should be identified. For some projects, add-on controls or process changes, such as
    carbon absorption, incineration or an engineering modification to stacks/vents, can reduce
    odorous emissions.
    “The potential for odor impacts from the project is potentially significant.”
    Based on this analysis, the initial study proposed the following mitigation measure
    (3.3.8): “If a future project use will generate odorous emissions or is a type of operation
    identified in Table 2-2 of the Butte County APCD CEQA Air Quality Handbook, prior to
    issuance of building permits the applicant shall consult with the CCAPCD and Colusa
    County Environmental Health Department to determine what type of engineering controls
    or other odor-reduction measures can be implemented. The odor-reduction measures
    shall be installed in accordance with accepted engineering practice.” (Italics added.)
    As ultimately adopted by the county, mitigation measure 3.3.8 provides in full as
    follows: “Prior to issuance of building permits, the project applicant shall consult with
    the Colusa County Air Pollution Control District and the Colusa County Environmental
    Health Department to determine if their project operations would result in an odor source
    locating next to potential receptors within distances indicated in Table 2-2 of the Butte
    County Air Quality Management District’s CEQA Air Quality Handbook. The CCAPCD
    and Colusa County Environmental Health Department shall recommend feasible odor
    mitigation measures, including but not limited to: add-on controls or process changes,
    such as carbon absorption, incineration or an engineering modification to stacks/vents
    that are applicable to the specific project operations. Applicable mitigation measures
    recommended by the CCAPCD and the Colusa County Environmental Health
    Department shall be installed in accordance with accepted engineering practice. Prior to
    issuance of final Certificate of Occupancy, the project applicant shall provide evidence
    37
    demonstrating that recommendations from the CCAPCD and Colusa County
    Environmental Health Department have been incorporated into the project plans.
    Furthermore, for projects that cannot fully mitigate their impacts with odor mitigation
    measures as determined by the CCAPCD and Colusa County Environmental Health
    Department, additional environmental review shall be required.”
    The Romingers contend the proposed mitigation measure contained in the initial
    study “is inadequate for two reasons.” First, they contend “there is no indication that the
    amorphous ‘engineering controls or other odor-reduction measures’ will even be
    available or reduce odor impacts to less-than-significant.” Second, they contend that
    “requiring the applicant to ‘consult’ with CCAPCD and CCEHD impermissibly defers a
    formulation of an actual mitigation to a future date and fails to include any meaningful
    performance standard.” In support of both arguments, the Romingers cite a letter from
    their air quality consultant, which states in relevant part as follows: “[I]t is important to
    note that some land uses, particularly those associated with agricultural production, may
    result in significant odor-related impacts to nearby receptors, even with the
    implementation of available emissions control technologies. In some instances, adequate
    emissions control technology may not be available to reduce this impact to a less-than-
    significant level. This mitigation measure, as currently written, would not necessarily
    preclude odor sources from being installed that could still have a potentially significant
    impact to nearby sensitive land uses, even with incorporation of engineering controls.
    Therefore, incorporation of available emissions control technologies, in and of itself, is
    not sufficient to reduce this impact to a less-than-significant level. Furthermore, the
    proposed mitigation measure fails to identify the performance standards to be used for the
    evaluation of future land uses, with regard to odor generation. It is, therefore,
    recommended that this measure be revised to identify the specific thresholds to be used
    for the evaluation of the odor potential associated with future onsite land uses. Given the
    38
    proximity of nearby receptors and prevailing wind directions, the installation of major
    odor-generating uses at this location should be prohibited.”
    As the Romingers recognize, the operative question here is whether the record
    contains substantial evidence supporting a fair argument that the Adams subdivision may
    have significant odor impacts notwithstanding the mitigation measure the county adopted
    in approving the mitigated negative declaration. With this in mind, the most significant
    problem with the Romingers’ arguments is that the letter from their air quality consultant
    on which those arguments are based is too vague to amount to substantial evidence
    supporting a fair argument of significant odor impacts notwithstanding the mitigation
    measure to which the county has committed itself. The consultant generally concludes
    that the installation of emissions control technology may not be sufficient to reduce the
    impact of the project to less than significant because “[i]n some instances, adequate
    emissions control technology may not be available.” The consultant does not identify
    what types of odors cannot be adequately mitigated with emissions control technology,
    nor does the consultant explain what land uses -- other than “some land uses . . .
    associated with agricultural production” -- might occur in the Adams subdivision that
    could produce such odors. Absent such specifics, we are unable to conclude that
    substantial evidence in the record supports a fair argument that the project may result in
    significant odor impacts notwithstanding the adopted mitigation measure.
    To the extent the Romingers complain that mitigation measure 3.3.8 is inadequate
    because it amounts to “[u]nenforceable, deferred mitigation,” we disagree. Contrary to
    the Romingers’ assertions, the mitigation measure not only requires the applicant to
    consult with various agencies so that the agencies can “recommend feasible odor
    mitigation measures,” it provides that any such recommended measures “shall be
    installed.” To the extent the Romingers complain that mitigation measure 3.3.8 “fails to
    include any meaningful performance standard,” they fail to explain what sort of
    performance standard could have been included given the uncertainty over exactly what
    39
    land uses may eventually occur in the Adams subdivision. In the absence of such greater
    specificity, the Romingers’ arguments are unpersuasive. Accordingly, their challenge to
    the odor element of the mitigated negative declaration is without merit.
    D
    Noise
    Although the Romingers’ arguments on the issue of noise appear under a heading
    that asserts “[t]he record contains substantial evidence of a fair argument of potentially
    significant environmental impacts,” the main thrust of their arguments on the issue of
    noise is actually a challenge to the adequacy of the discussion contained in the initial
    study that supported the mitigated negative declaration. For example, they assert that the
    mitigated negative declaration’s “noise discussion” -- which appears in the initial study --
    “is flawed because it omits the data or analysis necessary to support the conclusion that
    noise impacts will be less-than-significant.” In support of this assertion, they cite
    Citizens Assn. for Sensible Development of Bishop Area v. County of Inyo (1985) 
    172 Cal.App.3d 151
    , where the court stated that “although an initial study can identify
    environmental effects by use of a checklist [citation], it must also disclose the data or
    evidence upon which the person(s) conducting the study relied. Mere conclusions simply
    provide no vehicle for judicial review.”
    What the Romingers fail to acknowledge is that this passage from Citizens was
    qualified by the same court in Gentry v. City of Murrieta (1995) 
    36 Cal.App.4th 1359
    ,
    1377-1379. In Gentry, the plaintiff argued that “under Citizens, an initial study must
    disclose sufficient evidence to support each and every one of its findings.” (Gentry, at
    p. 1378.) The court expressly disagreed, explaining as follows:
    “In Citizens, we required an initial study to disclose the evidence upon which it is
    based in order to afford a basis for judicial review. However, we did not hold that the
    failure of an initial study to disclose the evidence supporting particular findings would
    necessarily be fatal to the resulting negative declaration. There is ‘no authority . . . that
    40
    an initial study is inadequate unless it amounts to a full-blown EIR based on expert
    studies of all potential environmental impacts. If this were true, the Legislature would
    not have provided in CEQA for negative declarations.’ [Citation.]
    “ ‘The agency [will] not be allowed to hide behind its own failure to gather
    relevant data. . . . CEQA places the burden of environmental investigation on
    government rather than the public. If the local agency has failed to study an area of
    possible environmental impact, a fair argument may be based on the limited facts in the
    record. Deficiencies in the record may actually enlarge the scope of fair argument by
    lending a logical plausibility to a wider range of inferences.’ [Citations.]
    “However, the ultimate issue is not the validity of the initial study, but rather the
    validity of the lead agency’s adoption of a negative declaration. Even if the initial study
    fails to cite evidentiary support for its findings, ‘it remains the appellant’s burden to
    demonstrate by citation to the record the existence of substantial evidence supporting a
    fair argument of significant environmental impact.’ [Citation.] ‘An absence of evidence
    in the record on a particular issue does not automatically invalidate a negative
    declaration. “The lack of study is hardly evidence that there will be a significant
    impact.” ’ ” (Gentry v. City of Murrieta, supra, 36 Cal.App.4th at pp. 1378-1379, fn.
    omitted.)
    We have reviewed the Romingers’ noise argument with the foregoing principles in
    mind, and we do not find anywhere where the Romingers adequately assert that there is
    substantial evidence in the record to support a fair argument that the Adams subdivision
    may have a significant environmental impact in the area of noise. They vaguely refer to
    their “expert[’s] opinion of the probable future consequences of the Project,” but they do
    not directly inform us what that opinion was or how that opinion supports a fair argument
    that the project may have a significant impact on noise levels. A page earlier, they refer
    to “evidence” from which the county should have concluded, based on “the noise
    generated by the proposed Project,” that “noise levels at the nearest residence . . . would
    41
    exceed the County’s applicable daytime and nighttime maximum allowable noise
    standards.” This evidence may be the “expert opinion” the Romingers later refer to, but
    that is not clear from their brief, and it is not for us to construct a sufficient argument for
    them from the disparate parts of the argument they chose to put together themselves,
    which focuses on the asserted inadequacy of the initial study rather than on the existence
    of substantial evidence in the record to support a fair argument that the project may have
    a significant environmental impact. Accordingly, we conclude the Romingers’ challenge
    to the noise element of the mitigated negative declaration is without merit.
    E
    Air Quality
    The initial study supporting the mitigated negative declaration concluded that
    projected construction activities for the Adams subdivision would result in estimated
    daily emissions of NOx that would be potentially significant, so mitigation measures
    (measures 3.3.2 and 3.3.3) were proposed to address that issue. At the same time, the
    initial study concluded that estimated daily emissions of ROG and PM10 would not
    exceed the applicable thresholds of significance.
    The Romingers first take issue with the latter conclusion, contending they offered
    expert evidence based on different data showing that estimated daily construction
    emissions of ROG and PM10 would exceed the applicable thresholds of significance. We
    need not consider this argument in detail, however, because even if the Romingers are
    correct on this point, it appears the mitigation measures proposed to address the excess
    emission of NOx during construction (measures 3.3.2 and 3.3.3) would also cover any
    excess emissions of ROG and PM10. At the very least, the Romingers have made no
    attempt to point to any evidence supporting a fair argument that those mitigation
    measures would be insufficient to reduce potential emissions of ROG and PM10 to below
    the threshold of significance.
    42
    The Romingers next argue that the mitigated negative declaration “contains
    unenforceable and deferred mitigation for air quality impacts.”9 First, they take issue
    with a passage in the initial study that provides as follows: “[F]uture development within
    the proposed subdivision will comply with the [Colusa County Air Pollution Control]
    District’s Rules and Regulations including the payment of an Indirect Source Review Fee
    (Rule 4.8).[10] Development subject to the [district] permitting requirements will obtain
    an Authorization to Construct from the [district], which will ensure that the operation of
    any facility within the proposed subdivision considered a stationary source will not
    interfere with the attainment or maintenance of ambient air quality standards.”11 The
    Romingers complain that “[a]lthough worded as a feature of the Project, th[ese]
    requirement[s] [are] not part of the Project description, and the applicant is not required
    through any legally binding instrument to comply with [them]. Therefore, the
    requirement[s] [are] not . . . enforceable . . . .” What the Romingers fail to recognize is
    that this passage actually summarizes provisions contained in proposed mitigation
    measure 3.3.5, which appears later in the study and which was adopted by the county.
    The Romingers do not challenge the adequacy of that mitigation measure, so their
    challenge to the earlier passage from the study is without merit.
    Next, the Romingers take issue with mitigation measure 3.3.1, which provides that
    “[p]rior to issuance of grading permits for the project site, and at the County’s discretion,
    the applicant shall prepare and submit a fugitive dust control plan for review and
    9       These arguments do not encompass mitigation measures 3.3.2 and 3.3.3, discussed
    in the previous paragraph, which address potential excess emissions during construction.
    10     We will refer to the Colusa County Air Pollution Control District as the district.
    11     In their brief, the Romingers do not quote this passage accurately. We have
    included the passage as it appears in the initial study.
    43
    approval to the [district].” The Romingers complain that “[t]his mitigation measure is
    unenforceable because it contains no standards to ensure its adequacy. There is no
    mandate requiring the applicant to do anything; it is left to the County’s ‘discretion.’ ” It
    is true that a public agency that adopts a mitigated negative declaration must “provide
    that measures to mitigate or avoid significant effects on the environment are fully
    enforceable through permit conditions, agreements, or other measures.” (CEQA, §
    21081.6, subd. (b).) The Romingers have not shown any violation of this requirement,
    however. The county’s retention of discretion to require the applicant to prepare and
    submit a fugitive dust control plan does not render this mitigation measure unenforceable
    because any abuse of that discretion by the county could be remedied through the courts
    in mandamus. (See, e.g., California Oak Foundation v. Regents of University of
    California (2010) 
    188 Cal.App.4th 227
    , 247 [“mandamus . . . is available to correct a
    public agency’s abuse of discretion”].) At the very least, the Romingers have not shown
    or even argued otherwise. Thus, we conclude the Romingers’ challenge to the air quality
    element of the mitigated negative declaration is without merit.
    F
    Greenhouse Gas Emissions
    The initial study concluded that “the project would achieve a 35 percent reduction
    in business-as-usual [greenhouse gas] emissions through compliance with regulatory
    measures.” The Romingers complain that the mitigated negative declaration is
    “inadequate” because it does not “quantify[] the baseline . . . emissions, or compar[e] the
    proposed Project’s . . . emissions to the baseline . . . emissions.” As we have explained
    already, however, the appellant’s burden in challenging the adoption of a negative
    declaration is to “‘demonstrate by citation to the record the existence of substantial
    evidence supporting a fair argument of significant environmental impact.’” (Gentry v.
    City of Murrieta, supra, 36 Cal.App.4th at p. 1379.) The Romingers fail to carry that
    burden here. They do not cite any evidence in the record or offer even a suggestion of a
    44
    fair argument as to why the Adams subdivision may result in significant environmental
    impact through greenhouse gas emissions.
    The Romingers also complain that the mitigated negative declaration “improperly
    presumes that statewide mitigation measures will reduce [greenhouse gas] emissions for
    the Project to less-than-significant.” The Romingers acknowledge that “a condition
    requiring compliance with regulations is a common and reasonable mitigation measure,
    and may be proper where it is reasonable to expect compliance.” (Oakland Heritage
    Alliance v. City of Oakland (2011) 
    195 Cal.App.4th 884
    , 906.) They assert, however,
    that “we have no reason to expect such compliance here, particularly in light of the fact
    that no Project condition requires such compliance and the [mitigated negative
    declaration] contains no other evidence of the County’s proposed method to ensure such
    compliance.”
    This argument fails in part because the “ ‘compliance with regulatory measures’ ”
    on which the initial study relies is not limited to compliance by the applicant or the
    ultimate user of the land at issue here. As the county explains, some of the reduction in
    greenhouse gas emissions “will result from newly applied standards, not [from] the
    County or the Real Party in Interest’s own actions.” To the extent, however, that the
    “regulatory compliance” at issue here is compliance by the applicant or by the ultimate
    land user, the Romingers offer no evidence to suggest that it would be unreasonable to
    expect such compliance here. Accordingly, the Romingers’ challenge to the greenhouse
    gas emissions element of the mitigated negative declaration is without merit.
    G
    Water Supply
    In the area of hydrology and water quality, the initial study concluded (among
    other things) that, with the adoption of mitigation measures addressing “well spacing and
    water management best practices,” the project would not substantially deplete ground-
    45
    water supplies. This conclusion was based on a water supply assessment that was
    appended to the initial study.
    The Romingers complain that the “[w]ater supply and demand figures [in the
    water supply assessment] are not properly supported.” More specifically, they assert that
    the assessment “underestimate[s] the Project’s potential demand by assuming the future
    use of the Project site will mirror the existing partially developed agricultural operations,
    and ignoring the reasonably foreseeable development allowed under the County’s Code
    (e.g., food processing and manufacturing) as compared to existing uses.” They also
    complain that the assessment “assum[es] that water conservation measures would
    voluntarily be implemented during dry years” and “estimates a water supply that is not
    supported by the record.” On this latter point, the Romingers assert that the conclusion in
    the water supply assessment that “the existing on-site wells can sustainably yield 679
    acre-feet per year” is unsupported because “[t]his yield is well in excess of the 23 acre-
    feet per year currently used on the Project site, yet the [water supply assessment]
    provide[s] no explanation of the discrepancy.”
    Addressing the very last point first, it is important to note that the fact that only 23
    acre-feet per year are currently used on the project site has no bearing on the sustainable
    yield of the existing wells, at least not without some evidence that the wells are being
    operated at or near capacity. Absent such evidence, it is reasonable to assume that the
    existing uses on the project site simply do not require the wells to produce all (or
    anywhere near all) of the water they could produce. Thus, the Romingers’ reliance on the
    current use of the wells is to no avail.
    We also note that the water supply assessment specifically states that its
    conclusion that the existing wells can sustainably yield 679 acre-feet per year is “based
    on the results of pump test activities described in Section 2” and “[b]ased on aquifer
    characteristics.” The Romingers make no effort to explain why these bases are not
    sufficient to support the conclusion drawn.
    46
    Turning to the Romingers’ water supply arguments more broadly, we find it
    dispositive that, beyond complaining about supposed deficiencies in the water supply
    assessment, the Romingers make no effort to demonstrate that the record contains
    substantial evidence supporting a fair argument that the Adams subdivision may have a
    significant impact on groundwater supplies notwithstanding the county’s conclusion to
    the contrary. Instead, they simply follow-up their list of supposed deficiencies in the
    water supply assessment with the bald assertion that the record contains such evidence.
    And in support of that assertion, they cite 13 pages of the administrative record without
    making an attempt to explain what is contained in those pages or why it is relevant. As it
    turns out, those pages consist of a five-page letter from a consultant purporting to
    evaluate the adequacy of the county’s groundwater analysis, along with an eight-page
    curriculum vitae for the consultant. And while the Romingers’ failure to explain the
    significance of this letter is by itself sufficient to defeat their arguments -- because, as we
    have previously explained, it is not for us to construct a sufficient argument for them --
    we note that even the consultant states in his letter that his “review of the groundwater
    analysis is based on whether [the initial study/mitigated negative declaration] provides
    adequate substantial evidence to support its conclusions that groundwater resource
    impacts can be mitigated to less than significant consistent with the requirements of
    CEQA and relevant case law.” In other words, the thrust of the consultant’s criticism
    was apparently to attack the evidentiary basis for the county’s conclusion that the project
    would not have a significant impact on groundwater supplies, rather than identifying or
    providing evidence to support a fair argument to the contrary.
    For the foregoing reasons, the Romingers have failed to carry their burden of
    demonstrating by citation to the record the existence of substantial evidence supporting a
    fair argument that the project will have a substantial impact on groundwater.
    Accordingly, the Romingers’ challenge to the water supply element of the mitigated
    negative declaration is without merit.
    47
    DISPOSITION
    The judgment is reversed, and the case is remanded to the trial court with
    instructions to enter a new judgment granting the Romingers’ mandamus petition with
    respect to the traffic element of the mitigated negative declaration only, as detailed
    above. The parties shall bear their own costs on appeal. (Cal. Rules of Court, rule
    8.278(a)(5).)
    ROBIE                  , J.
    We concur:
    RAYE                  , P.J.
    BUTZ                  , J.
    48
    

Document Info

Docket Number: C073815

Citation Numbers: 229 Cal. App. 4th 690, 177 Cal. Rptr. 3d 677, 2014 Cal. App. LEXIS 813

Judges: Robie

Filed Date: 9/9/2014

Precedential Status: Precedential

Modified Date: 11/3/2024