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Home My WebLink AboutAttachment_A_Arborist Report9JENNINGS TREE PRESERVATION,LLC JENNITP806DZ Certified Arborist Report James L.Jennings ISA Certified Arborist #PN-8541A ISA Qualified Tree Risk Assessor Site Locations: 459 Index Ave NE Renton,WA 98056 455 Index Ave NE Renton,WA 98056 Prepared For: Jian Yu &Ming Chen mingchenteddy3@gmail.com Date of Inspection:4:30 pm November 11th,2024 Tools Used:Tape measure,visual Site #1 459 Index Ave NE The site location at 459 Index Ave NE is a residential lot.The soil is sandy loam, with adequate drainage.Weather conditions at the time of inspection were slightly cloudy and a cool moderate temperature,with a slight SSW prevailing wind. Tree #1 Description:This is a 90’Douglas Fir (Pseudotsuga menziesii)with a diameter at breast height (DBH)of roughly 40 inches.Tree #1 has a 40’crown spread and is growing on a slight slope.Tree #1’s overall vigor rating is normal, Targets:House,neighbor’s house,deck,any occupants of either house Jennings Tree Preservation LLC 1 Defect Conditions:Multiple defect conditions present. Wind Exposure-Fully exposed to wind. Crown and Branches-The crown of the Douglas fir tree has a normal vigor rating.The crown has 90%live and 10%necrotic growth.Branches are long and hang over the house.Given the species profile,these branches are likely to self-prune as end weight gets heavier and will ultimately cause damage to the house,the neighbor’s house and deck. Trunk and Collar-The critical root zone fully covered by pavement,creating an anaerobic environment in the soil.This has started the process of root decay and will destabilize the structure of the tree,which increases the likelihood of whole tree failure. Tree Risk Rating:High,The house is within the dripline of the tree,and is therefore well within striking distance in the event of whole or partial failure.The Douglas fir is fully exposed to the wind and has a compromised root zone.The likelihood of whole or partial failure of this tree is probable,and it is very likely that in the event of failure,the falling branch or tree would strike this house.A combined failure and impact event is very likely,which will cause severe consequences to property and occupants. Mitigation Options:Removal,with no residual risk.No other mitigation options available,as this is a problem with the root zone. Tree #2 Description:This is a 90’Douglas Fir (Pseudotsuga menziesii)with a diameter at breast height (DBH)of 36 roughly inches.Tree #2 has a 20’crown spread.Tree #2’s overall vigor rating is normal, Targets:House and occupants Defect Conditions:Multiple defect conditions present. Wind Exposure-Partial wind exposure. Jennings Tree Preservation LLC 2 Crown and Branches-The crown of the Douglas fir tree has a normal vigor rating.The crown has 85%live and 15%necrotic growth.The crown is unbalanced and weighted towards the house.Long branches are outstretched over the house.Given the species profile,branches are likely to self-prune as end weight gets heavier,and will ultimately cause damage to the house. Trunk and Collar-The critical root zone is 40%covered by pavement,creating an anaerobic environment in the soil,on one side of the tree.This has started the process of root decay and will destabilize the structure of the tree.This increases the likelihood of whole tree failure. The tree also has codominant stems starting at the base of the tree.There is included bark between the stems,signifying decay at the junction.This increases the likelihood of whole stem failure. Tree Risk Rating:High,the house is within the dripline of the tree,and is therefore well within striking distance in the event of whole or partial failure.The Douglas fir has a compromised root zone as well as codominant stems starting at the base of the tree.The likelihood of whole or partial failure of this tree is probable,and it is very likely that in the event of failure,the falling branch or tree would strike this house.A combined failure and impact event is very likely,which will cause severe consequences to property and occupants. Mitigation Options:Removal,with no residual risk.No other mitigation options available,as this is a problem with the root zone and the structural integrity of the tree. Jennings Tree Preservation LLC 3 Site #2 455 Index Ave NE The site location at 455 Index Ave NE is a residential lot.The soil is sandy loam with adequate drainage.Weather conditions at the time of inspection were slightly cloudy and a cool moderate temperature,with a slight SSW prevailing wind. Tree #3 Description:This is a 95’Douglas Fir (Pseudotsuga menziesii)with a diameter at breast height (DBH)of roughly 36 inches.Tree #3 has a 20’crown spread.Tree #3’s overall vigor rating is normal. Targets:House and occupants Defect Conditions:Multiple defect conditions present. Wind Exposure-Partially exposed to wind. Crown and Branches-The crown of the Douglas fir tree has a normal vigor rating.The crown has 85%live and 15%necrotic growth.The crown of the tree is unbalanced and is weighted towards the house. Trunk and Collar-The trunk of the tree is covered in ivy.The ivy goes mostly up the tree and will eventually cut off the nutrient flow by girdling the tree.The critical root zone of the tree is affected by another high risk tree (Tree #2)pending removal. Tree Risk Rating:High,the house is within the dripline of the tree,and is therefore well within striking distance in the event of whole or partial failure.The Douglas fir is partially exposed to the wind,has an unbalanced crown and is covered in ivy.The likelihood of whole or partial failure of this tree is probable,and it is very likely that in the event of failure,the falling branch or tree would strike this house.A combined failure and impact event is very likely,which will cause severe consequences to property and Jennings Tree Preservation LLC 4 occupants. Mitigation Options:Removal,with no residual risk.No other mitigation options would be appropriate as the tree that is affecting its crown is pending removal (Tree #2)and would fully expose the Douglas fir to wind increasing the likelihood of failure. Replanting Recommendations Upon removal of hazardous trees new trees shall be planted in accordance with the City of Renton’s replanting ordinances. Please note tree risk increases with time.Do not hesitate to contact me via phone or email should you have any additional questions or to schedule an appointment for removal. James Jennings ISA Certified Arborist,TRAQ Qualified Phone:(425)622-5403 Email:jenningstreepreservation@gmail.com Website:www.jenningstreepreservation.com Jennings Tree Preservation LLC 5 Site Map Jennings Tree Preservation LLC 6 Base of Tree #1 covered in concrete Jennings Tree Preservation LLC 7 Tree 1 critical root zone completely covered Jennings Tree Preservation LLC 8 Tree #1’s proximity to the house Jennings Tree Preservation LLC 9 Tree #2 codominant stems and unbalanced crown Jennings Tree Preservation LLC 10 Tree #2 include bark at base of tree Jennings Tree Preservation LLC 11 (left)Tree #3 covered in ivy with an unbalanced crown (right)Tree #2 Codominant stems Jennings Tree Preservation LLC 12 (Left)Tree #3’s proximity to house (right)Tree #2 Jennings Tree Preservation LLC 13