Protecting the urban forest,

An email to Oak Bay’s arborist and the Mayor & Council, February 13, 2019:

I don’t know if the Planning Department has forwarded to you the Oak Bay United Church's Landscape and Arborist Report for comment yet, but having read it in detail, I have a few questions:

A copy of the report is attached.  This was downloaded from the OBUC web site and is the same as provided by the District of Oak Bay as part of a FOI request.

  1. Many of the Garry Oaks, and other notable trees, will have buildings erected on their PRZ (Protected Root Zone, called ‘root zone’ in the bylaws).
    For example see trees 972, 973 & 974 near Granite St drive entrance and 958 & 959 near Mitchell St townhouses (Page 3 – Arborist’s report)

Have OBUC applied for a permit under bylaw 4326 to damage the protected trees?

I note that the definition of “damage” includes the follow:

(a) cut or tear the roots of a tree growing inside the root zone;

(b) place fill or organic waste, building materials, asphalt or a building or structure upon land inside the root zone;

(f) remove soil from land inside the root zone;

(g) blast inside the root zone of a tree or outside the root zone so as to damage roots or disturb soil inside the root zone;

Trees 967 & 968 (amongst others) will have blasting in their root zones to make way for the underground car park

The OBUC are very proud to state in their Rezoning Application that “only two notable trees will be removed” but how many will be ‘damaged’ by this project?  Do you, as the District Arborist, expect all the remaining tress to survive the blasting and construction?

2. I note that the OBUC are planning on planting two new Garry Oaks, on Mitchell St, only 1.5 to 2.5 metres (5’ to 8’) from the west wall of the church (See planting description # 9. Page 2 of landscape report). Do you think that it is a good idea to plant Garry Oaks this close to a building?

Damaged trees end up as firewood - photo from Pexel

Damaged trees end up as firewood - photo from Pexel

A. Bolitho

Oak Bay

On February 14th, the arborist Chris Paul replies - the fastest answer any of us have ever received from anyone connect with this project! Thank you Chris Paul.

Hello Alan

Yes I have seen the report you have included with your email.

Question 1

No permit has been applied for under bylaw 4326 at this point. Once a building is approved we issue permits for tree removal and any work that is outlined in the arborist report. Tree and root zone protection outlined in the arborist report and any other requirements I may add will be made part of the permit conditions and are to be followed throughout demolition and construction. There are several Garry oaks that are close to the proposed building location as you have mentioned and there may be some impact on their root zones. Actual root zones will vary with soil conditions so impacts cannot be determined 100% prior to excavation. Garry oaks are reasonably tolerant of construction and if the remaining root zone is properly protected the trees should survive the construction. Arborist involvement at the time of excavation as outlined in the report will help minimize root damage and preserve the remaining root zones.

Question 2

Planting Garry oaks 2-3 meters from a building is acceptable if there are adequate soil volumes for the trees to grow in as there is there between the sidewalk and the church. The oaks are fairly slow growing and on the west side of the building it will be a long time before they get very large. Oaks will quite regularly grow out from under other oaks and grow in one direction to reach light. Garry oaks are not likely to cause damage to the foundation.

 I hope that answers your questions.

 Chris Paul