Tree and Stump Removal

In wild-land areas, forests follow natural life processes. The trees of the natural forest grow old, contract diseases and eventually die. After the tree falls on the forest floor, it eventually decays and supplies nutrients back into the soil. This self-sustaining natural process, unfortunately, cannot take place in urban areas because of the nature and conditions of the urban forest. The Palo Alto urban forest needs to be conscientiously managed in order to protect the health, safety and property of the residents and businesses.

Approximately 1-2 percent of public trees are removed annually. The decision to remove a public tree is based upon the condition of the tree in question.  The primary reasons for tree removal are: the tree is dead, dying, diseased, or is considered hazardous. It is important to note that hazardous conditions may exist above and/or below ground and may include significant root, trunk or crown decay, split trunks and crotches, and large dead limbs. In addition, trees may be identified for removal when they have declined beyond the point of recovery and are no longer meeting the functional requirements of a street tree (i.e., providing shade canopy). Typically, a tree with 30 percent or less of its foliage remaining would meet this criterion. Fatally diseased trees (e.g., Dutch Elm Disease) may be removed before they meet the primary or secondary thresholds in order to prevent the spread of disease to healthy trees. In some rare cases when a tree is creating significant, burdensome litter (such as a fruiting Ginkgo tree), the Urban Forester may determine that the tree is a removal candidate and replace it with a more suitable species. Less commonly, trees may be identified for removal when unavoidable construction work will immediately compromise the stability or viability of the tree. 

Trees that are removal candidates are identified by requests from residents or businesses, through the development process (as described below in Private Development Projects), through routine field work by Urban Forestry Section staff, or by other City staff or contract employees. All potential public tree removals are inspected and may be approved by Urban Forestry Section staff arborists (Urban Forester, Arborists, Project Managers, and Tree Trim-Line Clear Leads). Inspections may require multiple site visits and are often a collaborative effort between staff members.  

Once a tree becomes a removal candidate, staff take several steps to provide public notice prior to any trees being removed. The tree is first marked with a red or orange paint dot on the street side of the trunk. Written or telephone contact is made with the owner and/or tenant (if not the initial contact) of the property adjacent to the tree. The written or telephone contact is documented in the tree record database. Additional properties are notified when the tree is located very near the side property lines. When applicable, written or telephone contact is made with the initial contact. After notifications are completed, tree removal lists are compiled from the database and submitted for approval.  After approval, a fourteen-day Tree Removal Notice is also posted on the tree prior to removal. A replacement tree is planted at or near the location when there is an appropriate site. If the removal includes a significant tree or a number of trees, a letter is also sent to the affected neighborhood association. In an emergency or when an immediate hazard exists, Urban Forestry Section staff have authority to remove a tree without approval or notification.

Proposed private building projects with potential negative impacts to publicly-owned trees are subject to the Planning Department's permitting and public hearing process which includes the Public Works Urban Forester and/or Arborist's inspection and approval.  Removals caused by private projects are considered a taking from the public tree-scape. Trees that fall under this category are not permitted for removal unless the final planting plan results in an overall improvement to the public tree-scape. Typically, healthy and viable trees are protected through these projects. Occasionally, removals are permitted to facilitate an improvement to the public tree-scape. To be considered an improvement the project must include at least one of the following criteria:

Removal and replacement of a tree or trees that are hazardous or in poor health.
The proposed planting configuration results in a substantial improvement to the public treescape (i.e., an increase in tree numbers in viable sites or improvements to existing planting sites).
The applicant shall submit their arborist report for PW Arborist review.
Contingent upon approval of the arborist's report the by the PW Arborist, the applicant shall be responsible for all public outreach and posting. Signage will be provided by Public Works.

Stump removal occurs after the tree has been removed to the ground.  Because of the specialized nature of the work and the equipment required, the City contracts with a private company to remove stumps.  For cost efficiency, the project manager waits for an accumulation of stumps before the removals proceed, and stump removal may be delayed for up to six months after tree removal.  Once the appropriate quantity of stumps are accumulated, a list is compiled and the contractor will commence removal.  The contractor will temporarily remove all public and private improvements within the stump removal site and will remove all stump and roots using specialized grinding equipment.  The hole created by stump removal is filled to grade with native soil and mixed with the ground stump chips.  This prepares the area around the stump for replanting.  If the site is found suitable to support tree growth, a new tree will be planted.  Replanting will occur during the optimum replant season, which is generally November through March.

If a vacant site (where a public tree was removed) is suitable to support a new tree, the site is replanted with a suitable tree species.  Because the stump has to be placed on a stump removal list and because the planting season is typically during the dormant season, this process -- from removal to replanting -- may take up to 1.5 years.

The City of Palo Alto (COPA) Utility Department is working on a project to enhance the security of the local electric utility grid by providing for proper tree abatement and fence realignments and improvements at the COPA's Hanover Electric Substation (HES) and Hansen Way Substation (HWES), which are both on land leased from Stanford University.

This project came about as part of the Electric Substation Physical Security recommendation report, dated 2017, from the City of Palo Alto's 3rd party Consultant, Burns & McDonnell, in compliance with recent Federal Department of Energy Regulatory Commission (FERC) regulatory standards to enhance the security of the electric grid.

In getting all nine of our electric substations secured, we are directed " ... to remove as many trees and shrubs as practical from a 20' radius inside and outside our electric substation fences". Fences are to be "replaced to bring up to current standards" with a goal to "increase the space between the fencing and the utility assets within the electric substation". There is to be a 'clear-zone' to eliminate hiding places for any potential saboteurs, show an 'occupied' appearance, open up the view for outward pointing security cameras and lighting, and eliminate climbing aids for potential saboteurs to gain entry over the fences. With regulatory responsibility for the 'electric grid', FERC is stepping up the enforcement of protection for our nation's electric assets.

In addition to the regulatory directive, many of the tall trees surrounding HES & HWES  are within reach of the 60,000 volt electric overhead bus. These trees represent a potential unplanned loss of power to the Hanover Way/Hillview Drive/Page Mill Road/Porter Drive corridors in the event any of those trees should fall or lose large limbs towards the station bus during storms. Additionally, this work will increase the defensible space around these stations, helping to mitigate against possible wildfire incidents or impacts.

This project involves the removal of trees from around the permitter of Hansen Way and Hanover Substations to increase safety and security while meeting federal regulatory compliance. This project has been reviewed and approved by both Stanford University and the City of Palo Alto Development Services Department (pending final letter of approval). Replacement trees will be replanted nearby in accordance with the City’s Tree Technical Manual.

Trees Posted: 1/27/20  Posting Summary
Expected dates for vegetation removal: TBD
Trees to be removed: 
Hanover – 26 Eucalyptus, 6 Live Oaks, 2 Other - Map
             Hansen Way – 7 Redwoods, 3 Live Oaks, 15 Scrub Oaks, 2 Other - Map

Colorado Substation Project Summary:
This project involves the removal of trees from around the permitter of Colorado Substation to increase safety and security while meeting federal regulatory compliance. This project has been reviewed and approved by the City of Palo Alto Utilities Department. Replacement trees will be replanted nearby in accordance with the City’s Tree Technical Manual.

Trees Posted: 2/18/20  Posting Summary
Expected dates for vegetation removal: Between 3/04/20 and 3/31/20 by City of Palo Alto Tree Crews.
Trees to be removed: 
46 Horestail Trees, 7 Weeping Bottlebrush, Various Shrubs and Brush - Map