In the past few weeks we have established two basic steps that should be done in preparation to protect trees that are to be preserved on a construction site. First, involve a consulting Arborist in the beginning planning stages. Second, establish a Tree Protection Zone. This week I would like to talk about what the process should be when construction happens near the Tree Protection Zone. This could be digging in preparation for a foundation or the trenching necessary for utilities. The reason for concern as I mentioned last week is that many tree roots grow well past the dripline and the Tree Protection Zone fence will often be at or near the dripline. I have been involved in projects where I supervised any digging near “save” trees. That option may not be a part of every project work plan, but some basic principles can easily be followed by any excavation crew. Start digging by hand with a shovel first to discover what kind of roots may be encountered. If some small two- and three-inch diameter roots are found, cut them cleanly with a pair of loppers. Avoid machine digging at all expense as they can tear and pull the encountered roots damaging them far back into the Tree Protection Zone. Once you have hand dug and cleanly severed any encountered roots in the root plate zone, which is usually about 10-18 inches below grade, using a machine to continue is usually safe. I highly suggest a person with a shovel watching closely, however. Also be keenly aware of which way the equipment’s exhaust is pointed. Exhaust can easily burn a trees foliage.
Next week I will address soil compaction, how to avoid it and close with the final step of this series, follow up care of the trees after a project is finished.
Thank you for your patience in advance as we work our fall backlog list!