HOLLENHORST, J.
*642Plaintiff and appellant People for Proper Planning (PFPP) appeals from the judgment denying its petition for peremptory writ of mandate and complaint for declaratory and injunctive relief filed against defendants and respondents City of Palm Springs and Palm Springs City Council (herein collectively referred to as City). In its petition, PFPP challenged the City's adoption of Resolution No. 23415, which approved an Amendment to the City's General Plan (Amendment) removing the minimum density requirements for each residential development. The trial court denied PFPP's challenge, and it appeals, contending that the Amendment (1) is not exempt from the requirements of the California Environmental Quality Act (CEQA) (Pub. Resources Code, § 21000 et seq. ) because it is not a minor land use alteration; (2) is inconsistent with the General Plan (General Plan), *643such that it now makes the General Plan internally inconsistent; and (3) violates statutory requirements that the City accommodate its fair share of regional housing needs for all income levels, including low and very low income levels. For the reasons stated herein, we determine the Amendment is not exempted from CEQA requirements, and thus, reverse the judgment. In light of this determination, we need not address the other issues raised by PFPP.
I. PROCEDURAL BACKGROUND AND FACTS
PFPP is, according to its complaint, a California nonprofit membership organization *531"whose objective is to promote planning and development in Palm Springs in conformity with all applicable laws and regulations." Prior to September 4, 2013, the City's General Plan, in some parts, designated a minimum and maximum density of residential units allowed in each land use category. For example, a high density designation allowed for a range of "15.1 to 30" dwelling units per acre, while a medium density designation allowed for a range of "6.1 to 15" dwelling units per acre. In other parts, the General Plan did not set a lower end of the range, but rather simply provided for a high density of "30" dwelling units per acre, or a medium density of "22" dwelling units per acre. The General Plan explained that "[e]ach of the residential land use designations includes a range of allowable densities. The maximum density signifies the maximum number of dwelling units per gross acre that are allowed in each residential area," while "[t]he lower threshold figure for each of these categories represents a minimum amount of development anticipated, provided that all other required conditions can be met." (Italics added.)
While the General Plan sets forth the City's "permitted density of residential development ... the Zoning Ordinance provides specific guidance on applicable development standards." Thus, the zoning ordinance provides for the property development standards in residential zones, including the minimum lot, yard and building standards. In reference to planned residential development districts, the zoning ordinance provides that such a district "may include a multiplicity of housing types; provided, the density does not exceed the general plan requirements," and "[t]he form and type of development on the [planned development] site boundary shall be compatible with the existing or potential development of the surrounding neighborhoods." Thus, within a specific General Plan category, there are often several different zoning categories that dictate development standards and actual density allowances.
In 2013, the City sought to amend its General Plan to eliminate minimum density requirements for all residential land use categories, based on the *644planning commission staff report's recommendation. The City held a public hearing on the proposed Amendment. PFPP opposed the proposed Amendment. On September 4, 2013, by a vote of 3 to 2, the City adopted Resolution No. 23415, which amended the General Plan by removing any reference to minimum density requirements for each residential development. According to Resolution No. 23415, "the past and current practice of the City, including without limitation, the City Council, the Planning Commission, and the Director of Planning, is to consider only the maximum density allowed within each land category and consider and approve lower density project[s.]" The City concluded the change was exempt from CEQA based on a categorical exception.
On October 9, 2013, PFPP filed a petition for peremptory writ of mandate and complaint for declaratory and injunctive relief, seeking to set aside the City's approval of the Amendment on the grounds it is "inconsistent with the General Plan and violates Government Code [section] 65863, which prohibits cities and counties from reducing residential densities or allowing residential development of any parcel at lower residential densities absent certain findings not made here." The City answered the petition and both sides submitted briefs to the trial court. A hearing was held on November 7, 2014. After taking the matter under submission, the *532trial court denied the petition.1
II. DISCUSSION
A. Standard of Review
Generally, an appellate court reviewing a trial court's ruling on a petition for writ of mandate is confined to inquiring whether the findings and judgment of the trial court are supported by substantial evidence. Nevertheless, an appellate court must independently decide questions of law without deference to the trial court's conclusions. (Evans v. Unemployment Ins. Appeals Bd. (1985) 39 Cal.3d 398, 407, 216 Cal.Rptr. 782, 703 P.2d 122 ; Kreeft v. City of Oakland (1998) 68 Cal.App.4th 46, 53, 80 Cal.Rptr.2d 137.)
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HOLLENHORST, J.
*642Plaintiff and appellant People for Proper Planning (PFPP) appeals from the judgment denying its petition for peremptory writ of mandate and complaint for declaratory and injunctive relief filed against defendants and respondents City of Palm Springs and Palm Springs City Council (herein collectively referred to as City). In its petition, PFPP challenged the City's adoption of Resolution No. 23415, which approved an Amendment to the City's General Plan (Amendment) removing the minimum density requirements for each residential development. The trial court denied PFPP's challenge, and it appeals, contending that the Amendment (1) is not exempt from the requirements of the California Environmental Quality Act (CEQA) (Pub. Resources Code, § 21000 et seq. ) because it is not a minor land use alteration; (2) is inconsistent with the General Plan (General Plan), *643such that it now makes the General Plan internally inconsistent; and (3) violates statutory requirements that the City accommodate its fair share of regional housing needs for all income levels, including low and very low income levels. For the reasons stated herein, we determine the Amendment is not exempted from CEQA requirements, and thus, reverse the judgment. In light of this determination, we need not address the other issues raised by PFPP.
I. PROCEDURAL BACKGROUND AND FACTS
PFPP is, according to its complaint, a California nonprofit membership organization *531"whose objective is to promote planning and development in Palm Springs in conformity with all applicable laws and regulations." Prior to September 4, 2013, the City's General Plan, in some parts, designated a minimum and maximum density of residential units allowed in each land use category. For example, a high density designation allowed for a range of "15.1 to 30" dwelling units per acre, while a medium density designation allowed for a range of "6.1 to 15" dwelling units per acre. In other parts, the General Plan did not set a lower end of the range, but rather simply provided for a high density of "30" dwelling units per acre, or a medium density of "22" dwelling units per acre. The General Plan explained that "[e]ach of the residential land use designations includes a range of allowable densities. The maximum density signifies the maximum number of dwelling units per gross acre that are allowed in each residential area," while "[t]he lower threshold figure for each of these categories represents a minimum amount of development anticipated, provided that all other required conditions can be met." (Italics added.)
While the General Plan sets forth the City's "permitted density of residential development ... the Zoning Ordinance provides specific guidance on applicable development standards." Thus, the zoning ordinance provides for the property development standards in residential zones, including the minimum lot, yard and building standards. In reference to planned residential development districts, the zoning ordinance provides that such a district "may include a multiplicity of housing types; provided, the density does not exceed the general plan requirements," and "[t]he form and type of development on the [planned development] site boundary shall be compatible with the existing or potential development of the surrounding neighborhoods." Thus, within a specific General Plan category, there are often several different zoning categories that dictate development standards and actual density allowances.
In 2013, the City sought to amend its General Plan to eliminate minimum density requirements for all residential land use categories, based on the *644planning commission staff report's recommendation. The City held a public hearing on the proposed Amendment. PFPP opposed the proposed Amendment. On September 4, 2013, by a vote of 3 to 2, the City adopted Resolution No. 23415, which amended the General Plan by removing any reference to minimum density requirements for each residential development. According to Resolution No. 23415, "the past and current practice of the City, including without limitation, the City Council, the Planning Commission, and the Director of Planning, is to consider only the maximum density allowed within each land category and consider and approve lower density project[s.]" The City concluded the change was exempt from CEQA based on a categorical exception.
On October 9, 2013, PFPP filed a petition for peremptory writ of mandate and complaint for declaratory and injunctive relief, seeking to set aside the City's approval of the Amendment on the grounds it is "inconsistent with the General Plan and violates Government Code [section] 65863, which prohibits cities and counties from reducing residential densities or allowing residential development of any parcel at lower residential densities absent certain findings not made here." The City answered the petition and both sides submitted briefs to the trial court. A hearing was held on November 7, 2014. After taking the matter under submission, the *532trial court denied the petition.1
II. DISCUSSION
A. Standard of Review
Generally, an appellate court reviewing a trial court's ruling on a petition for writ of mandate is confined to inquiring whether the findings and judgment of the trial court are supported by substantial evidence. Nevertheless, an appellate court must independently decide questions of law without deference to the trial court's conclusions. (Evans v. Unemployment Ins. Appeals Bd. (1985) 39 Cal.3d 398, 407, 216 Cal.Rptr. 782, 703 P.2d 122 ; Kreeft v. City of Oakland (1998) 68 Cal.App.4th 46, 53, 80 Cal.Rptr.2d 137.)
*645Examples of questions of law relevant to this appeal include (1) determining the meaning of a statute (People ex rel. Lockyer v. Shamrock Foods Co. (2000) 24 Cal.4th 415, 432, 101 Cal.Rptr.2d 200, 11 P.3d 956 ), and (2) determining the meaning of a provision of a general plan because a charter city's adoption of such plan is a legislative act (Gov.Code, § 65700, subd. (a) ; see Chandis Securities Co. v. City of Dana Point (1996) 52 Cal.App.4th 475, 481, 60 Cal.Rptr.2d 481 ). Although a trial court's conclusions on questions of law are not entitled to deference, "the City's legislative enactments are entitled to some deference; there is a presumption that both the general plan and the initiative measures amending such are valid [citation], and so long as reasonable minds might differ as to the necessity or propriety of the enactment, the municipality's (or electorate's) determination of policy must be upheld. [Citation.] The only issue to be resolved is whether, applying the standard that the legislation, unless clearly arbitrary, capricious, or entirely lacking in evidentiary support, must be upheld [citation], the general plan, as amended, substantially complies with state law, i.e., whether there has been ' "actual compliance in respect to the substance essential to every reasonable objective of the statute," as distinguished from "mere technical imperfections of form." [Citation.]' [Citation.]" (Garat v. City of Riverside (1991) 2 Cal.App.4th 259, 292, 3 Cal.Rptr.2d 504, disapproved on other grounds as stated in Morehart v. County of Santa Barbara (1994) 7 Cal.4th 725, 743, fn. 11, 29 Cal.Rptr.2d 804, 872 P.2d 143.)
B. The City Erred in Relying on a Categorical Exemption
PFPP contends the City erred by relying on a categorical exemption because the Amendment is not a minor alteration of a land use limitation; furthermore, even if the exemption could apply, it would not here because the Amendment has a strong possibility of having an adverse impact on the environment. We agree.
*533"To achieve its objectives of environmental protection, CEQA has a three-tiered structure. [Citations.] First, if a project falls into an exempt category, or ' "it can be seen with certainty that the activity in question will not have a significant effect on the environment" [citation], no further agency evaluation is required.' [Citation.] Second, if there is a possibility the project will have a significant effect on the environment, the agency must undertake an initial threshold study; if that study indicates that the project will not have a significant effect, the agency may issue a negative declaration. Finally, if the project will have a significant effect on the environment, an environmental impact report (EIR) is required. [Citation.]" (Committee to Save the Hollywoodland Specific Plan v. City of Los Angeles (2008) 161 Cal.App.4th 1168, 1185-1186, 74 Cal.Rptr.3d 665 (Committee to Save the Hollywoodland ).)
*646Here, the City never undertook an initial threshold study because it found the Amendment to fall into an exempt category. "The Legislature has made certain categories of projects exempt from CEQA. Many of these exemptions appear in Public Resources Code section 21080, subdivision (b). [Citations.] Public Resources Code section 21080, subdivision (b)(9) exempts from CEQA '[a]ll classes of projects designated pursuant to [Public Resources Code] [s]ection 21084.' [¶] Public Resources Code section 21084 authorizes the Secretary of Resources Agency to include in the Guidelines