An Arlington Tree Removal with a Surprise Inside

Arlington has a lot of overhead utility lines: power, telephone, cable. This is different from suburbs west of Arlington, where such lines tend to be underground. So we run into a lot of mature trees that are involved with these aerial utility lines, which can be an issue when performing an Arlington tree removal.

One particular case comes to mind where just such a tree needed to be removed. We sounded the tree and determined that it was hollow. It was leaning over the street and over some power lines.

We sounded this particular tree using the old-fashioned rubber mallet method and determined that it was quite hollow and needed to come down. Because of the issue with the power lines, we had to get in touch with Dominion Power, because they own the lines upon which the tree encroached. We were on site with Dominion Power while they created their safe radius around their utility lines. Since Dominion Power is not always willing to remove debris, we removed the debris while they created the radius. Once the tree is a safe distance, which is a 10 foot radius away from those lines, then we finished the removal.

When we finally removed the trunk of the tree, we found that the cavity, the hollow area, was large enough for three men to stand inside it! The only thing holding the tree up was a 2" band of bark around it, but obviously that's a formula for trouble. The homeowner got lucky in that it didn't do damage to the surrounding area and his property.

The reason the tree experienced this condition, the reason for the root cavity in the first place was that some 40 years before we removed it, the tree was back-filled about four feet up the trunk of the tree, meaning that the roots were covered by soil and could not get sufficient oxygen. They built a wall in front of their house to make some space for a walkway. The terrain had a very steep pitch, as a lot of Arlington homes have, and they basically buried this tree in their efforts to overcome the steepness of the grade. This decision led to the creation of a massive cavity over time that not only killed the tree but also created a danger to the surrounding environment.

When a tree is in the beginning of its life, there is a natural taper at the bottom where the roots come out, which we call "the zone of rapid taper" or "the root flare". If something gets built around that tree, there may need to be grade changes or back-fill that goes around the tree, but you have to be careful how you do it because the process of grading is what buries the tree. Obviously, you cannot move the tree up as you move the grade up, so the root flare ends up getting covered. This leads to root death in most cases unless it is done in such a way that the critical root zone can still "breathe". Roots have to respire. So if you back-fill around a tree, you have to use arable fill or something else that allows the root zone to breathe and not die.

In this case, the deep root zone died, and the cavity of decaying wood spread right up the trunk of the tree. This created a big "cave" inside the trunk of the tree.

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