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HomeMy WebLinkAboutTR_517_BasicTreeRiskAssessmentForm_Fillable_FirstEdition — 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 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 Main concern(s) Load on defect N/A  Minor  Moderate  Significant  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 Main concern(s) Load on defect N/A  Minor Moderate  Significant  Client _______________________________________________________________ Date___________________ Time_________________ Address/Tree location _________________________________________________________ Tree no.____________ Sheet _____ of _____ Tree species _________________________________________ dbh_____________ Height ___________ Crown spread dia. ____________ Assessor(s) __________________________________________ Time frame_____________ Tools used______________________________ Target Assessment Target numberTarget description Practical to move target? Restriction practical?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_____________________________________________________ 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 planned change in load factors _________________________________________________________________________________________ Tree Defects and Conditions Affecting the Likelihood of Failure Occupancy rate1–rare 2 – occasional 3 – frequent 4 – constant Likelihood of failureLikelihood of failure Basic Tree Risk Assessment Form Page 1 of 2 Site Factors Target zone Target within drip line Target within 1x Ht. Target within 1.5x Ht.Main concern(s) Load on defect N/A  Minor  Moderate  Significant  Likelihood of failure Improbable  Possible  Probable  Imminent  Improbable Possible  Probable  Imminent Improbable Possible  Probable  Imminent  1 2 3 4 Matrix 1. Likelihood matrix. Likelihood of Failure Likelihood of Impacting Target 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 UnlikelyCondition numberPart sizeFall distanceTarget protection Conditions of concern Failure Impact Failure & Impact (from Matrix 1) Likelihood ImprobableImminentPossibleVery lowUnlikelyNegligibleMediumLikelySignificantProbableLowSomewhatMinorHighVery likelySevereConsequences Risk rating of part (from Matrix 2)Tree part Likelihood of Failure & Impact Consequences of Failure N e 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 Mitigation options _____________________________________________________________________ Residual risk ________ ____________________________________________________________________________________ Residual risk ________ ____________________________________________________________________________________ Residual risk ________ ____________________________________________________________________________________ Residual risk ________ Overall tree risk rating Low  Moderate  High  Extreme  Work priority 1  2  3  4  Overall residual risk Low  Moderate  High  Extreme  Recommended inspection interval __________________ This datasheet was produced by the International Society of Arboriculture (ISA) and is intended for use by Tree Risk Assessment Qualified (TRAQ) arborists – 2013 North Page 2 of 2 Matrix 2. Risk rating matrix. Risk Categorization Target number