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Home My WebLink AboutAttachment 1: TR_Arborist_Report_Aviator_010921_v11 ARBORIST REPORT for - Aviator Apartments - Goodman Real Estate Parcel: 2923059134 35929 21st Pl S, Federal Way, WA 98003 Wednesday, September 1st, 2021 By Izzy Nosan | ISA Certiﬁed Arborist WE-11653A | TRAQ certiﬁed | izzy@aplustree.com 985 Walnut Avenue, Vallejo, CA 94592 | (206) 550-6679 | www.aplustree.com 2 Background Information This report was prepared on behalf of Aviator Apartments concerning a tree risk assessment of 1 red alder (Alnus rubra) and 3 small, dead Western cottonwoods (Populus trichocarpa) located at 10408 SE 174th St, Renton, WA 98055. The trees are located in the northeast corner of the community. The tree risk assessment was performed on July 12th, 2021. The tree risk assessment was regarding the present condition, tree integrity, and future expectations of the trees. The trees were assessed with speciﬁc focus on the potential risk to the property, residents, and visitors. The trees on this report were viewed as being high risk, given nearby targets, site history, species characteristics, and occupancy rates, and have been recommended for removal. The trees are within close proximity to critical target areas such as an apartment home and a neighboring parking lot. Assignment (and any limiting factors) The assignment was a visual assessment in regard to health, condition, structural integrity, threat of pest/disease and potential hazards. This visual assessment was performed solely from ground grade and was completed to provide recommendations for future action. A Plus was requested to assess the aforementioned trees at Aviator apartments and provide a report regarding recommendations for safety concerns and potential impact to the property, and to distinguish if the trees pose a future risk. Aviator management intends to reduce the risk of future tree failures and/or structural damage on site by acquiring arborist services for mitigation of high risk trees. Aviator management intends to plant replacement trees according to the City of Renton regulations for tree retention standards following mitigatory tree care. No limiting factors were encountered during this assessment. Report continues on following page 3 Observations At the time of the assessment, the following was observed: (Please refer to the associated photos in the Attachments portion at the end of this report.) 1)1 10” DBH red alder, Alnus rubra •Approximate height: 40 feet •A Plus Tree ID# 1000857094 a.This tree is mostly dead, dying from the top down, and expected to have internal decay, weakening the structural integrity of the tree. b.The adjacent apartment homeland a pedestrian access area are within the drip line the tree, and a neighboring property’s parking lot is within 1 X Height of the tree. c.If retained, the tree is expected to suffer future trunk failure, and/or other individual large tree part failures in a heavy loading event or under normal circumstances. Large-diameter pieces are found within the canopy. If any of these tree parts were to fail and contact the building, a pedestrian, or the neighboring property’s parking area, moderate to signiﬁcant consequences would be expected. d.This tree is being recommended to be removed and stump retained in order to minimize residual risk. 2)1 5” DBH Western cottonwood, Populus trichocarpa •Approximate height: 30 feet •A Plus Tree ID# 1000857091 a.This tree is dead and has failed from the roots. b.The easterly neighboring parking area and a pedestrian access area are within the drip line the tree. c.If retained, the tree is expected to suffer future trunk failure, and/or other individual large tree part failures in a heavy loading event or under normal circumstances. Large-diameter pieces are found within the canopy. If any of these tree parts were to fail and contact a pedestrian, or the neighboring property’s parking area, moderate to signiﬁcant consequences would be expected. d.This tree is being recommended to be removed and debris retained in order to minimize residual risk. Report continues on following page 4 3)1 4” DBH Western cottonwood, Populus trichocarpa •Approximate height: 25 feet •A Plus Tree ID# 1000857092 a.This tree is dead. b.The adjacent apartment home is within 1 X Height of the tree, and a pedestrian access area is within the drip line of the tree. c.If retained, the tree is expected to suffer future trunk failure, and/or other individual large tree part failures in a heavy loading event or under normal circumstances. Large-diameter pieces are found within the canopy. If any of these tree parts were to fail and contact a pedestrian, or the apartment home, mild to moderate consequences would be expected. d.This tree is being recommended to be removed and debris retained in order to minimize residual risk. 4)1 4” DBH Western cottonwood, Populus trichocarpa •Approximate height: 25 feet •A Plus Tree ID# 1000857093 a.This tree is dead. b.The adjacent apartment home is within 1 X Height of the tree, and a pedestrian access area is within the drip line of the tree. c.If retained, the tree is expected to suffer future trunk failure, and/or other individual large tree part failures in a heavy loading event or under normal circumstances. Large-diameter pieces are found within the canopy. If any of these tree parts were to fail and contact a pedestrian, or the apartment home, mild to moderate consequences would be expected. d.This tree is being recommended to be removed and debris retained in order to minimize residual risk. Report continues on following page 5 Testing / Analysis No soil assessment or advanced testing procedures were conducted. Discussion Upon visual inspection of the trees discussed in this report, the poor and/or dead conditions of the trees were expected to reduce the trees’ structural integrity and to increase the likelihood of future failures. The trees were viewed as high risk and likely to fail under normal conditions or a heavy loading event. Given the associated targets, occupancy rates, and moderate to signiﬁcant consequences upon failure, the trees presented on this report were ranked as being high-risk to the Aviator apartment community and visitors. Given the poor condition and high-risk of the trees, they have exhausted their usefulness as landscape trees and have become liabilities; expected to fail towards critical target areas with occasional to constant occupancy. Future failures are expected to occur in a heavy-loading event, or under normal conditions, if these trees are retained as-is. Given that the associated targets are within the drip line of the tree or within 1 X Height of the tree, they are expected to cause future property or personal damage if retained. Aviator management intends to plant replacement trees according to the City of Renton’s standard, following mitigatory tree care. Recommendations Following the site visit to Aviator apartments, and the assessment of the trees included on this report, the following is recommended: The trees on this report are being recommended to be removed to the ground and the debris retained. •Replacement trees should be replanted in site and climate appropriate spaces with adequate access to critical resources, and in accordance to the City of Renton's tree code regulations. •Acceptable species would be: Paciﬁc crabapple, vine maple, Paciﬁc dogwood, Ginko biloba. Alternative mitigation options were considered, but removal was deemed the preferred recommendation out of practicality and to minimize residual risk. Photos On Following Pages 6 Attachments: Photo 1a: ArborPlus inventory data: Tree ID: 1000857094 Mostly dead red alder is expected to be structurally unsound due to expected internal decay. Tree is within striking distance of apartment home and neighboring parking area. Report continues on following page 7 Photo 1b: Report continues on following page 8 Photo 1c: Report continues on following page 9 Photo 2a: ArborPlus inventory data: Tree ID: 1000857094 Dead and uprooted cottonwood. Report continues on following page 10 Photo 3a: ArborPlus inventory data: Tree ID: 1000857092 Dead cottonwood. Report continues on following page 11 Photo 4a: ArborPlus inventory data: Tree ID: 1000857093 Dead cottonwood.