Certified Arborist Practice Exam

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Doing this allows for utility lines to be installed under a tree rather than cutting roots:

Tunneling
Air-spade
Grinding
Pruning

The correct answer is: Air-spade

The correct answer involves the technique that allows for the careful excavation of soil around tree roots without causing significant damage to them. The process of tunneling enables utility lines to be installed underground while preserving the health of the tree. By using specialized tools, the soil can be removed without cutting through essential root systems, which helps maintain the tree's stability and vitality. Other methods mentioned, such as air-spading, typically focus on aerating soil and diagnosing root issues rather than specifically facilitating the installation of utility lines. Grinding refers to the removal of roots or stumps, which can harm a tree's structure. Pruning involves cutting branches and is not applicable to safely installing utilities underground. In contrast, tunneling specifically provides a solution that minimizes the impact on the tree's root system while also achieving the practical goal of utility installation.