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Home My WebLink AboutA_Arborist_Report_231120_FINrentonwa.gov/permitcenter | planningcustomerservice@rentonwa.gov | 425-430-7294 10/6/2022 Page 1 of 3 CITY OF RENTON Ι PERMIT CENTER TREE RETENTION AND CREDIT WORKSHEET TREE RETENTION REQUIREMENTS A minimum retention of thirty percent (30%) of all significant trees (as defined in RMC 4-11-200) is required on site. Please complete the form below to verify compliance with minimum tree retention requirements. • Identify total number of trees 6-inch caliper or greater (or alder or cottonwood trees 8-inch caliper or greater) on site: Trees Trees Trees Trees Trees Trees Required Trees Proposed •Deductions – Certain trees are excluded from the retention calculation: o Trees that are high-risk, as defined in RMC 4-11-200: o Trees within existing and proposed public right-of-way: o Trees within wetlands, streams, very high landslide hazards, protected slopes, and associated buffers: •Total remaining trees after deductions: •Required tree retention (30%): •Identify number of trees proposed for retention: •Identify number of trees requested for replacement in lieu of retention (skip page 3 if no tree replacement is requested):Trees TREE CREDIT REQUIREMENTS Tree credit requirements apply at a minimum rate of thirty (30) credits per net acre. Complete the form below to determine minimum tree credit requirements. •Gross area of property in square feet: Square Feet •Deductions: Certain areas are excluded from tree credit calculation: o Existing and proposed public right-of-way: Square Feet o Wetlands, streams, very high landslide hazards, protected slopes, and associated buffers: Square Feet •Total excluded area:Square Feet •Net land area (after deductions) in square feet:Square Feet •Net land area (after deductions) in acres:Acres •Required tree credits:Tree Credits Required rentonwa.gov/permitcenter | planningcustomerservice@rentonwa.gov | 425-430-7294 10/6/2022 Page 2 of 3 TREE RETENTION AND CREDIT WORKSHEET PROPOSED TREE CREDITS Please complete the table below to calculate the total tree credits proposed for your project. Identify the quantity of trees for each tree category, after deducting trees within excluded areas, as shown in the previous section. TREE SIZE TREE CREDITS TREE QUANTITY TOTAL TREE CREDITS RETAINED TREES Preserved tree 6 – 9” caliper 4 Preserved tree 10 – 12” caliper 5 Preserved tree 12 – 15” caliper 6 Preserved tree 16 – 18” caliper 7 Preserved tree 19 – 21” caliper 8 Preserved tree 22 – 24” caliper 9 Preserved tree 25 – 28” caliper 10 Preserved tree 29 – 32” caliper 11 Preserved tree 33 – 36” caliper 12 Preserved tree 37” caliper and greater 13 NEW TREES New small species tree (30' or less at maturity) 0.25 New medium species tree (30' to 50' at maturity) 1 New large species tree (50' or more at maturity) 2 TREE CREDITS PROPOSED: rentonwa.gov/permitcenter | planningcustomerservice@rentonwa.gov | 425-430-7294 10/6/2022 Page 3 of 3 TREE RETENTION AND CREDIT WORKSHEET TREE REPLACEMENT JUSTIFICATION Replacement may be authorized as an alternative to 30% retention provided the removal is the minimum necessary to accomplish the desired purpose and provided the proposal meets one of the following options: a. There are special circumstances related to the size, shape, topography, location, or surroundings of the subject property; or b. The strict application of the code would prevent reasonable use of property; or c. The strict application of the code would prevent compliance with minimum density requirements of the zone; or d. The project is a short plat with four (4) or fewer lots. Please attach a written justification demonstrating compliance with the requirements and criteria as descripted above. TREE REPLACEMENT QUANTITY Tree replacement quantity is determined based on the credit value of the trees proposed for removal. Larger, higher priority trees shall be used for calculation of tree replacement. Identify the quantity of each tree requested to be removed in lieu of 30% retention, based on tree size. List the identification number of each tree, as indicated in the arborist report. TREE SIZE TREE CREDITS TREE QUANTITY TREE INDENTIFICATION # TOTAL TREE CREDITS Tree 37” caliper + 13 Tree 33 – 36” caliper 12 Tree 29 – 32” caliper 11 Tree 25 – 28” caliper 10 Tree 22 – 24” caliper 9 Tree 19 – 21” caliper 8 Tree 16 – 18” caliper 7 Tree 12 – 15” caliper 6 Tree 10 – 12” caliper 5 Tree 6 – 9” caliper 4 REPLACEMENT CREDITS REQUIRED: TREE REPLACEMENT PLANTING Identify the quantity of proposed new replacement trees (minimum size of 2-inch caliper). The total replacement credits proposed should be equal to or greater than the replacement credits required, as shown in the previous section. TREE SIZE TREE CREDITS TREE QUANTITY TOTAL TREE CREDITS New small species tree (30' or less at maturity) 0.25 New medium species tree (30' to 50' at maturity) 1 New large species tree (50' or more at maturity) 2 REPLACEMENT CREDITS PROPOSED: — Trunk — — Crown and Branches — — Roots and Root Collar — Unbalanced crown  LCR ______% Dead twigs/branches  ______% overall Max. dia. ________ Broken/Hangers Number __________ Max. dia. ________ Over-extended branches  Pruning history Crown cleaned  Reduced  Flush cuts  Thinned  Topped  Other Raised  Lion-tailed  Cracks  ________________________________ Lightning damage  Codominant ______________________________ Included bark  Weak attachments _________________ Cavity/Nest hole ____% circ. Previous branch failures _____________ Similar branches present  Dead/Missing bark  Cankers/Galls/Burls  Sapwood damage/decay  Conks  Heartwood decay  ______________________ Response growth Client _______________________________________________________________ Date___________________ Time_________________ Address/Tree location _________________________________________________________ Tree no.____________ Sheet _____ of _____ Tree species _________________________________________ dbh_____________ Height ___________ Crown spread dia. ____________ Assessor(s) __________________________________________ Tools used______________________________ Time frame_____________ Target Assessment Target numberTarget description Target protection Practical to move target? Restriction practical?Target within drip line Target within 1x Ht.Target within 1.5x Ht.1 2 3 4 History of failures _____________________________________________________________ Topography Flat Slope _________% Aspect _____ Site changes None  Grade change  Site clearing Changed soil hydrology Root cuts Describe _____________________________________ Soil conditions Limited volume Saturated Shallow Compacted Pavement over roots ______% Describe __________________________ Prevailing wind direction______ Common weather Strong winds  Ice Snow Heavy rain Describe______________________________ Tree Health and Species Profile Vigor Low  Normal  High  Foliage None (seasonal) None (dead) Normal _____% Chlorotic _____% Necrotic _____% Pests/Biotic_________________________________________________ Abiotic _______________________________________________________ Species failure profile Branches Trunk Roots Describe ____________________________________________________________________ Load Factors Wind exposure Protected Partial Full Wind funneling ________________________ Relative crown size Small Medium Large Crown density Sparse Normal Dense Interior branches Few Normal Dense Vines/Mistletoe/Moss  _____________________ Recent or expected change in load factors ________________________________________________________________________________________ Tree Defects and Conditions Affecting the Likelihood of Failure Occupancy rate1–rare 2 – occasional 3 – frequent 4 – constant Basic Tree Risk Assessment Form Page 1 of 2 Site Factors Target zone Condition(s) of concern Load on defect N/A  Minor  Moderate  Significant  Likelihood of failure Improbable  Possible  Probable  Imminent  Load on defect N/A  Minor  Moderate  Significant  Likelihood of failure Improbable  Possible  Probable  Imminent  Part Size Fall Distance Load on defect N/A  Minor  Moderate  Significant  Likelihood of failure Improbable  Possible  Probable  Imminent  Dead/Missing bark  Abnormal bark texture/color  Codominant stems  Included bark  Cracks  Sapwood damage/decay  Cankers/Galls/Burls  Sap ooze  Lightning damage  Heartwood decay  Conks/Mushrooms  Cavity/Nest hole _____ % circ. Depth _______ Poor taper  Lean _____° Corrected? __________________________________ Response growth Condition(s) of concern Part Size Fall Distance Collar buried/Not visible  Depth________ Stem girdling  Dead  Decay  Conks/Mushrooms  Ooze  Cavity  _____% circ. Cracks  Cut/Damaged roots  Distance from trunk _______ Root plate lifting  Soil weakness  Response growth Condition(s) of concern Load on defect N/A  Minor  Moderate  Significant  Likelihood of failure Improbable  Possible  Probable  Imminent  Part Size Fall Distance Part Size Fall Distance Chris Barten 11/16/23 2:17 12733 SE 163 Street, Renton, WA 98058 1 1 2 Douglas ﬁr 40”160’30 Terry Flatley Diameter tape, camera 1 year Driveway ✔✔✔4 No Sidewalk ✔✔4 No Driveway approach ✔✔4 No Turf areas ✔✔✔4 No Some small branches falling into yard and driveway ■10 North ■ ■■■45 Asphalt driveway West ■■9 months out of 12 months ■■100 None Mechanical damage to structural roots in driveway ■■End loaded branches fail when overloaded with cone crop, heavy rain or snow, strong winds and icey conditions ■■■ ■■■Vine Root cutting to replace heaved driveway, sidewalk and drive approach will increase risk to stability. 40”25 feet ■ ■ ■10 feet ■ Heaving driveway, sidewalk, approach, turf areas 12” plus N/A ■ ■ Target (Target number or description)Tree part Condition(s) of concern Risk rating (from Matrix 2) Matrix 1. Likelihood matrix. Likelihood of Failure Likelihood of Impact Very low Low Medium High Imminent Unlikely Somewhat likely Likely Very likely Probable Unlikely Unlikely Somewhat likely Likely Possible Unlikely Unlikely Unlikely Somewhat likely Improbable Unlikely Unlikely Unlikely Unlikely Failure Impact Failure & Impact (from Matrix 1) Likelihood ImprobableImminentPossibleVery lowUnlikelyNegligibleMediumLikelySignificantProbableLowSomewhatMinorHighVery likelySevereConsequences Likelihood of Failure & Impact Consequences of Failure Ne g l i g i b l e Minor Significant Severe Very likely Low Moderate High Extreme Likely Low Moderate High High Somewhat likely Low Low Moderate Moderate Unlikely Low Low Low Low Data Final  Preliminary Advanced assessment needed No Yes-Type/Reason ________________________________________________ Inspection limitations None Visibility Access Vines Root collar buried Describe ___________________________________________ Notes, explanations, descriptions 1.__________________________________________________________________________________ Residual risk ________ 2.__________________________________________________________________________________ Residual risk ________ 3.__________________________________________________________________________________ Residual risk ________ 4.__________________________________________________________________________________ Residual risk ________ Overall tree risk rating Low  Moderate  High  Extreme  Overall residual risk None  Low  Moderate  High  Extreme  Recommended inspection interval __________________ This datasheet was produced by the International Society of Arboriculture (ISA) — 2017 North Page 2 of 2 Matrix 2. Risk rating matrix. Risk Categorization Mitigation options This assessment is based on the assumed condition of having to sever multiple structural roots on the East side of the tree to effectuate driveway repairs using the owner’s preferred construction techniques to replace like with like.” Driveway Structural roots Roots are heaving asphalt driveway ●●●●Extreme Sidewalk Structural roots Roots heaving sidewalk ●●●●Extreme Driveway approach Structural roots Roots heaving approach and creating tripping hazard ●●●●Extreme Turf areas Structural roots Roots heaving turf creating trip hazard and reducing lawn maintenance ●●●●Extreme Tree roots have surfaced onto driveway and grown large severely damaging the asphalt surfacing creating trip hazards and making access difﬁcult if not impossible. Tree roots have heaved the public sidewalk and created tripping hazards in three locations. Tree roots have heaved the driveway approach tilting it towards the street and creating a 1-inch lift, a tripping hazard. Tree roots have heaved turf areas and surfaced in several locations creating tripping hazards and make lawn maintenance impossible in several locations. Remove roots and tree 0 ■ ■ ■■ ■