If your development application needs an arborist report, this is the service. I prepare independent tree inventories, impact assessments, tree protection plans, and mitigation recommendations for projects across Sacramento, Placer, El Dorado, and Amador counties, written to hold up to the scrutiny a planning department and the California Environmental Quality Act apply to them. Every report is prepared by an ISA Board Certified Master Arborist who runs no removal crew, so nothing in it is written to sell a cut.
What Is a CEQA Arborist Report?
A CEQA arborist report is an independent tree survey and impact assessment that documents the trees on or near a project site and how construction will affect them, prepared so a public agency can satisfy the California Environmental Quality Act before approving the project. When a project site contains trees, the report documents every tree on or adjacent to the project footprint, assesses the potential impact of construction on those trees, and recommends specific mitigation measures to minimize harm. Many Sacramento County, Placer County, and El Dorado County jurisdictions require this report before granting grading permits, conditional use permits, or tentative subdivision maps. The arborist report becomes part of the environmental review record and may be referenced in Mitigated Negative Declarations or Environmental Impact Reports.
Where the Report Fits in the CEQA Process
It helps to see the sequence the report is feeding. Under CEQA Guidelines section 15063, after preliminary review a lead agency conducts an Initial Study to determine whether the project may have a significant effect on the environment, and that Initial Study may rely on expert opinion supported by facts, technical studies, or other substantial evidence. A tree survey is one of those technical studies. Guidelines section 15064 then governs the significance determination itself, and it is explicit that the judgment is to be based to the extent possible on scientific and factual data, and that significance varies with the setting, so an effect that is minor in an urban setting may be significant in a rural one.
What counts as evidence in that determination is defined by statute. Public Resources Code section 21082.2 describes substantial evidence as facts, reasonable assumptions predicated on facts, and expert opinion supported by facts, and it excludes argument, speculation, and unsubstantiated opinion or narrative. That single sentence is the reason a CEQA arborist report has to show measurements, methods, and reasoning rather than conclusions. An opinion with facts behind it is evidence. The same opinion without them is not.
From there the path forks. If the Initial Study shows no significant effect, the agency adopts a Negative Declaration. If potentially significant effects can be reduced below significance by revisions the applicant agrees to before public review, Public Resources Code section 21064.5 provides for a Mitigated Negative Declaration. If substantial evidence supports a fair argument of a significant effect that cannot be avoided, the agency prepares an Environmental Impact Report. Tree impacts land in all three outcomes, and a clear report is often what allows a project to stay in the mitigated negative declaration lane rather than sliding into a full EIR.
Where Trees Enter the Analysis
Trees are not their own CEQA topic. They come in through biological resources, and the standard Appendix G initial study checklist asks directly whether the project would conflict with any local policies or ordinances protecting biological resources, such as a tree preservation policy or ordinance. That is the hook for every heritage tree ordinance, oak protection ordinance, and street tree rule in this region, and it is why local ordinance analysis belongs inside the arborist report rather than beside it.
Oak woodlands have their own statute, and it matters throughout the Sierra foothills. Public Resources Code section 21083.4 requires a county to determine whether a project within its jurisdiction may result in a conversion of oak woodlands that will have a significant effect on the environment, and if so to require one or more of the listed mitigation alternatives. Those include conserving oak woodlands through conservation easements, planting replacement trees with a seven year maintenance obligation, contributing funds to the Oak Woodlands Conservation Fund, and other mitigation the county develops. The statute limits how much of the requirement replacement planting alone may satisfy, and it exempts certain project categories. Anyone working on a foothill project with oaks on it should read that section early, because it shapes the mitigation conversation before design is finished.
Mitigation, as CEQA Actually Defines It
CEQA Guidelines section 15370 defines mitigation as a set of five things, in order: avoiding the impact altogether by not taking an action or part of one, minimizing the impact by limiting the degree or magnitude of the action, rectifying the impact by repairing, rehabilitating, or restoring the affected environment, reducing or eliminating the impact over time through preservation and maintenance during the life of the action, and compensating for the impact by replacing or providing substitute resources, including through permanent protection such as conservation easements.
Read that list against tree work and the whole structure of a good arborist report falls out of it. Avoidance is shifting a building pad or a utility alignment out of a root zone. Minimization is reducing the encroachment, using pier foundations, or tunneling rather than trenching. Rectification is root pruning done properly, soil decompaction, and irrigation during establishment. Reduction over time is the protection fencing, the monitoring schedule, and the maintenance obligation through construction and beyond. Compensation is replacement planting at a set ratio or an in lieu contribution. A report that jumps straight to replacement ratios has skipped four categories the Guidelines put ahead of it, and that is a fair target during public comment.
Mitigation Has to Be Monitored
Mitigation measures are not self executing, and CEQA does not treat them as promises. Public Resources Code section 21081.6 requires the public agency to adopt a reporting or monitoring program for the changes made to the project or the conditions of approval that were adopted to mitigate or avoid significant effects, designed to ensure compliance during project implementation. In practice this is why tree protection language in a report needs to be written as verifiable conditions with a schedule attached, not as general advice. Fencing at a stated distance, inspected before grading begins. Root pruning supervised. A monitoring visit at defined milestones. A written record each time. If a measure cannot be checked, it will not survive as mitigation.
Local Thresholds Still Govern
CEQA sets the framework, but the number that decides your project is usually local. Guidelines section 15064.7 encourages each public agency to develop and publish thresholds of significance, defined as an identifiable quantitative, qualitative, or performance level of a particular environmental effect, and thresholds adopted for general use must be adopted by ordinance, resolution, rule, or regulation through a public review process and supported by substantial evidence. Agencies may also apply thresholds case by case. For trees, this is where the local protected diameter, the oak canopy retention percentage, and the replacement ratio actually live. The first thing I do on a new project is read the applicable local ordinance and threshold, because a technically excellent report written to the wrong threshold is still a rejected report.
What a CEQA Arborist Report from Sierra Tree and Fungi Includes
A complete report includes a field inventory of every tree within and adjacent to the project area, with species identification, trunk diameter at the standard measuring height, canopy spread, height, health rating, and structural condition. The report provides a site map showing tree locations relative to proposed grading, structures, and utilities. Each tree receives an impact assessment rating: no impact, low impact, moderate impact, or removal required. For trees that can be preserved, I provide tree protection specifications including fencing distances, root pruning protocols, grade change limitations, and construction monitoring schedules. For trees that must be removed, the report includes mitigation recommendations such as replacement ratios, species selection for replanting, and the mitigation requirements the lead agency applies. Heritage trees and trees protected under local ordinances receive additional analysis of ordinance compliance requirements. Methods and limitations are stated plainly, so the agency can see exactly what the survey covered.
One boundary is worth stating up front. I do not offer tree appraisal or tree valuation and I am not qualified to perform it, so my reports do not assign a dollar value to a tree. Where a jurisdiction requires an in lieu fee calculation based on appraised value, that portion is referred to a qualified appraiser.
What a tree protection plan contains
A tree protection plan, sometimes called a tree preservation plan, is the part of the report that tells the contractor what they may and may not do around the trees that are staying. It is the document that decides whether the trees you agreed to save are still alive at the end of the job. Most planning conditions requiring tree preservation are satisfied by this plan, and most tree loss on development sites happens because the plan was either never written or never enforced.
A workable plan sets a tree protection zone for each retained tree, sized from trunk diameter and species tolerance rather than by eye, and specifies protective fencing on that boundary before any equipment arrives. Inside the zone it prohibits the things that quietly kill trees: soil and material storage, vehicle traffic and parking, concrete and stucco washout, trenching, and any change of grade. Where a utility line or a footing has to enter the zone, the plan calls for it to be bored or tunneled rather than trenched, and for any root that must be cut to be cut cleanly and under supervision instead of torn out by a bucket.
The plan also covers the parts people forget: irrigation through the dry season while the tree is carrying construction stress, mulch over the protected root zone, a named person responsible for the fencing staying up, inspections at the milestones where damage actually happens, and a written sign off at the end. ANSI A300 Part 5 covers the management of trees and shrubs during site planning, site development, and construction, and it is the standard the operational side of this work is measured against.
How construction actually kills trees
Three things do nearly all of the damage, and none of them look dramatic on the day. Roots get severed by trenching and grading, usually much closer to the trunk than anyone expected, because most of a tree's absorbing roots sit in the top foot or two of soil and reach well past the branch tips. Soil gets compacted by repeated equipment traffic, which collapses the pore space roots need for oxygen and water. And the grade gets changed, either by scraping soil off the root zone or by piling fill against the trunk, which buries the root collar and starts a slow rot at the base.
The reason this keeps happening is timing. A tree that lost a third of its roots in June often looks fine that summer and the next one, then thins, declines, and dies somewhere between two and five years later, long after the contractor has gone and the connection has been forgotten. By the time the symptoms are readable the cause is no longer fixable. That lag is the whole argument for putting the protection in writing before the equipment arrives rather than diagnosing the loss afterward, and it is why I am often called to explain, years later, why a mature tree on a finished lot is dying.
Why an Independent Consulting Arborist Matters for CEQA
CEQA documents face scrutiny from planning commissions, environmental review boards, and sometimes opposing legal counsel. A report prepared by an arborist who also sells tree removal services can be challenged for bias. As an independent consulting arborist, I have no financial interest in whether trees are removed or retained. I run no removal crews and I do not prune or remove trees at all. My reports are based solely on the biological and structural condition of each tree and the engineering realities of the proposed project. Given that Public Resources Code section 21082.2 counts only expert opinion supported by facts, independence and documentation are not soft virtues here. They are what makes the report usable as evidence.
Service Area for CEQA Arborist Reports
I provide CEQA arborist reports for projects in Sacramento County, Placer County, El Dorado County, and Amador County. Common project locations include Sacramento, Roseville, Rocklin, Folsom, El Dorado Hills, Placerville, Cameron Park, Auburn, Lincoln, Granite Bay, Rancho Cordova, Citrus Heights, Elk Grove, and Jackson. Whether your project involves a single parcel or a large subdivision, I can typically complete the field survey and deliver the finished report within two to three weeks.
Request a CEQA Arborist Report
Contact Sierra Tree and Fungi to discuss your project timeline, site conditions, and report requirements. A site assessment with a written report starts at $450, and the site visit on its own is $250 for up to one hour on site. Project scale CEQA work is quoted before scheduling. Call (530) 391-6100 or email Christopher@SierraTreeandFungi.com to schedule a consultation.
Frequently Asked Questions
Do I need an arborist report for my development application?
That depends on the jurisdiction and what is on the site. Most local agencies in this region require one when a project will remove or encroach on protected trees, native oaks, heritage trees, or trees over a set trunk diameter, and many will not treat the application as complete without it. If native oaks are involved in an unincorporated county, assume the answer is yes. The quickest way to find out is to send me the parcel number and the site plan, and I will tell you what the agency is going to ask for.
What is a tree protection plan?
It is the written specification for keeping retained trees alive through construction: the protection zone around each tree, fencing on that boundary before work starts, what is prohibited inside it, how utilities are allowed to cross it, irrigation and mulch during the job, who is responsible, and inspection at the points where damage occurs. It is frequently a condition of approval, and it is the difference between trees that survive the build and trees that die two years after it.
How far from the trunk does tree protection fencing go?
There is no single number, and be wary of anyone who gives you one without measuring. The protection zone is calculated from trunk diameter and then adjusted for species tolerance, the age and condition of the tree, and the soil. The old habit of fencing at the dripline underprotects most trees, because roots commonly extend well beyond the branch tips. The distance goes into the report for each tree individually.
Does CEQA always require an arborist report?
Not always. CEQA requires an arborist report when a project could remove or damage trees that the lead agency treats as an environmental resource, such as protected oaks, heritage trees, or a significant canopy. The lead agency, usually a city or county planning department, decides during the initial study under CEQA Guidelines section 15063 whether a tree survey is needed, and the Appendix G checklist asks specifically whether the project would conflict with a local tree preservation policy or ordinance.
How long does a CEQA arborist report take?
For most Sacramento area projects I complete the field survey and deliver the finished report within two to three weeks. Larger subdivisions take longer because every tree on and adjacent to the footprint is inventoried, measured, and rated. Rush turnaround is available when a permit deadline is tight.
Who pays for the arborist report, and who receives it?
The project applicant pays for the CEQA arborist report, and it is submitted to the lead agency as part of the environmental review record. The report may be cited in a Mitigated Negative Declaration or an Environmental Impact Report, so it has to be accurate and defensible enough to survive public comment.
What does CEQA count as mitigation for tree impacts?
CEQA Guidelines section 15370 defines mitigation as avoiding, minimizing, rectifying, reducing over time, or compensating for an impact, in that order. For trees that means redesigning to avoid a root zone first, reducing encroachment second, repairing damage third, protecting and maintaining through the life of the project fourth, and replacement planting or an in lieu contribution last. Replacement ratios alone are the weakest of the five and should not be the first answer.
My project is in El Dorado County and has oaks on it. What changes?
Public Resources Code section 21083.4 applies to counties and requires a determination of whether the project may convert oak woodlands with a significant effect, and if so the county must require one or more listed mitigation alternatives, including conservation easements, replacement planting with a seven year maintenance obligation, or a contribution to the Oak Woodlands Conservation Fund. The statute also limits how much of the mitigation requirement replacement planting alone can satisfy, so oak projects need that analysis early rather than at the end.
Do tree protection measures have to be monitored?
Yes, when they are adopted as mitigation. Public Resources Code section 21081.6 requires the lead agency to adopt a reporting or monitoring program designed to ensure compliance during project implementation. That is why protection measures in my reports are written as checkable conditions with distances, timing, and inspection points rather than as general recommendations.
Do you provide the appraised value of trees to be removed?
No. I do not offer tree appraisal or tree valuation and I am not qualified to perform it. If your jurisdiction requires an in lieu fee based on appraised value, that portion of the work is referred to a qualified appraiser while I handle the inventory, impact analysis, protection specifications, and mitigation plan.
California Environmental Quality Act sources
- AEP, CEQA Statute and GuidelinesThe Association of Environmental Professionals edition of the full CEQA statute and the CEQA Guidelines, the source for sections 15063, 15064, 15064.7, and 15370.
- California Governor's office, CEQA overviewThe state land use office explanation of CEQA, which requires agencies to look before they leap and to disclose environmental consequences.
- California Governor's office, CEQA GuidelinesThe state page on the regulations implementing CEQA, which point to the full text of the Guidelines.
- Public Resources Code 21082.2, substantial evidenceDefines substantial evidence as facts, reasonable assumptions predicated on facts, and expert opinion supported by facts, and excludes speculation and unsubstantiated opinion.
- Public Resources Code 21064.5, mitigated negative declarationDefines a mitigated negative declaration as one where revisions agreed to by the applicant reduce the effects below significance.
- Public Resources Code 21081.6, mitigation monitoringRequires the public agency to adopt a reporting or monitoring program designed to ensure compliance during project implementation.
- Public Resources Code 21083.4, oak woodlandsRequires a county to determine whether a project may convert oak woodlands with a significant effect, and lists the mitigation alternatives it may require.
Arboricultural references
- ISA, Avoiding Tree Damage During ConstructionInternational Society of Arboriculture consumer guidance on construction impacts to trees and on treating trees damaged by construction.
- ISA store: standards and best management practicesWhere the ANSI A300 tree care standards, ANSI Z133 Safety and Health Requirements for Arboricultural Operations, and the ISA Best Management Practices series are published.
- USDA Forest Service, A Field Guide to Insects and Diseases of California OaksGeneral Technical Report PSW-GTR-197, Swiecki and Bernhardt, Pacific Southwest Research Station, 2006. The standard regional reference for oak pests and pathogens.
Sources
- CEQA Guidelines, California Code of Regulations title 14, sections 15063 Initial Study, 15064 Determining the Significance of the Environmental Effects Caused by a Project, 15064.7 Thresholds of Significance, 15370 Mitigation, and Appendix G environmental checklist, biological resources item e.
- California Public Resources Code sections 21064.5, 21081.6, 21082.2, and 21083.4.