HomeMy WebLinkAboutTR_Arborist Report_1210249JENNINGS 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
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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.
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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.
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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
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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
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Site Map
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Base of Tree #1 covered in concrete
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Tree 1 critical root zone completely covered
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Tree #1’s proximity to the house
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Tree #2 codominant stems and unbalanced crown
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Tree #2 include bark at base of tree
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(left)Tree #3 covered in ivy with an unbalanced crown (right)Tree #2 Codominant stems
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(Left)Tree #3’s proximity to house (right)Tree #2
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