Addendum 1 Arborist
6 KB Posted
- Solicitation number
- 23-122
- Issued by
- Dekalb County, Brooklet City, Georgia
About this file
This addendum is a supplemental document from the City of Johns Creek regarding tree preservation requirements for the Taylor Road Operational Improvements project, specifically addressing a tree located at approximately station 106+50 on the left side. The addendum details comprehensive arborist recommendations for protecting and maintaining the existing tree throughout the construction phase and recovery period. During construction, the contractor must install silt fencing around the tree's root zone, either along the drip line or 25 feet from the base, and maintain the protected area free of construction debris with 2-4 inches of biodegradable mulch. All severed roots measuring 2 inches in diameter or larger must be cleanly cut using appropriate tools and treated with fungicide by a licensed applicator, with oversight from a certified arborist to ensure proper root pruning techniques.
Following construction completion, the tree requires ongoing maintenance for a minimum of 3-5 years to facilitate recovery from construction impacts. This includes annual soil injection fertilization with slow-release products beginning in spring, a three-year insect treatment program targeting ambrosia beetles and other boring insects that typically attack stressed trees, and annual inspections by a certified arborist to monitor tree health and identify potential risks. All post-construction tree care services, including fertilization applications and pest management treatments, must be performed by licensed professionals and overseen by a certified arborist, with pricing to be provided separately for these specialized services.
Text of this file
Taylor Road Operational Improvements
Re: Tree at ~106+50 LT, Recommendations From the City Arborist
At construction:
Tree root zone should be partitioned with silt fencing from the limit of disturbance and following, at minimum, along the drip line of the canopy. Alternatively, silt fencing should be placed 25 feet (based on tree diameter) from the base of the tree all the way around the tree. The area inside the silt fence should be kept clean of any and all construction debris. This area should also be mulched with approximately 2-4 inches of biodegradable mulch (wood chips, pinestraw, etc) The builder should be capable of most of this but may need a landscape service to mulch.
Severed roots from any earth moving should be clean cut. The jagged ripped edges caused by construction and digging are bad for tree health. At time of root exposure, roots 2" in diameter and larger should be clean cut with a chainsaw, loppers, hand saw or other such tool.
Additionally, ends of these roots should be treated with a fungicide to limit infection during construction. This will need to be provided by someone with a license to treat trees and shrubs and the root pruning should ideally be overseen by a certified arborist.
Following construction:
There is a lingering construction impact time for such operations of 3-5 years. The tree should be fertilized through soil injection for minimally 3 years (once in spring with a slow release product) to help recover lost root systems and keep nutrients available to the persisting root system. The tree should also be treated for boring insects like ambrosia beetle, which often kill stressed trees like this one will be during construction. That program should also continue for 3 years so as to protect the tree from this sort of invasion during recovery.
The tree should also be inspected at LEAST annually by a certified arborist to monitor recovery and potential risks. You will receive some pricing info on this portion of services later but this should be completed by a licensed applicator and the program should be overseen by a certified arborist.
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| 23-122 NOIA | — | |
| 23-122 Plans | — | |
| Award Information | — | |
| 23-122 addendum #1 | — | |
| 23-122 Bid Packet | — | |
| 23-122 Bids | — | |
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| 23-122 revised plans | — | |
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