[CANUFNET] pavement construction near large trees

[2vojka at rogers.com]

Hello Canufnet,

I am reviewing a proposal to repave a  lane in a well vegetated residential area. Curently, the lane is paved with gravel and it is proposed to replace the gravel with asfalt paving. The lane elevation may no change, therefore, the asfalt paving when finished must be at axisting grade, requiring at least 35cm deep excavation. There are a number of large trees (the largest are two silver maples with diameter greater than 100cm)  in the close proximity of the lane. The excavation for the asfalt bed will result in severing a great portion of the root system of those trees.

The engineers are prepared to hand excavate around the trees and ensure that no roots are severed....but they would like to have the root protection requirements written in a form of construction specifications.

I was wondering if anyone has dealt with a similar situation and may have available construction specs addressing the above described problem.

Thanks in advance.

Best regrds, 
Vojka Miladinovic
Urban Forestry Planner
City of Toronto
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