Tree Risk Assessment form

• Client

  Douglas Shire Council

  Other

• Conducted on

  Date

• Prepared by

• Site Address
  Address

• Tree Location. Examples: back yard, between road and footpath, left side of driveway, northern side property etc.

• Tree species (Botanical if known or common name)

• Tree d.b.h in centimetres (Diameter at breat height)

• Tree Height in meters (visually estimated or measured)

  Select less than 5m 5 - 10m 10 - 15m 15 - 20m 20m+ Measured (tool used to be noted)

  • less than 5m
  • 5 - 10m
  • 10 - 15m
  • 15 - 20m
  • 20m+
  • Measured (tool used to be noted)

• Crown spread diameter in meters (average diameter of drip line of the tree; measured or estimated.

  Measured

  Estimated

• Tools used during inspection

  Select Range finder Diameter tape Binoculars Mallet Other None

  • Range finder
  • Diameter tape
  • Binoculars
  • Mallet
  • Other
  • None

• Time frame - period in which the likelihood of failure is being estimated for.

  6 months

  1 year

  2 years

  Other

• Target description

  Select Footpath Road Park Play ground Structure Other

  • Footpath
  • Road
  • Park
  • Play ground
  • Structure
  • Other

• Target protection: note any significant factors that could protect the target as this may affect the likelihood of impact and/or the consequence of failure.

• Target zone

  Select Target within drip line - target under canopy of tree Target within 1 x height - target is within striking distance if the trunk or root system of the tree fails (1 times the height of the tree). Target within 1.5 x height - target is within striking distance if the trunk or root system of the tree fails and there are dead or brittle branches that could shatter and fly from the failed tree

  • Target within drip line - target under canopy of tree
  • Target within 1 x height - target is within striking distance if the trunk or root system of the tree fails (1 times the height of the tree).
  • Target within 1.5 x height - target is within striking distance if the trunk or root system of the tree fails and there are dead or brittle branches that could shatter and fly from the failed tree

• Occupancy rate - An estimated amount of time the target is within the targe zone.

  Select 1. Rare - The target zone is not commonly used by people or other targets. 2. Occasional - The target zone is occupied by people or other targets infrequently or irregularly. 3. Frequent - The target zone is occupied for a large portion of the day or week by people or other targets. 4. Constant - A target is present at all times, 24 hours a day, 7 days a week.

  • 1. Rare - The target zone is not commonly used by people or other targets.
  • 2. Occasional - The target zone is occupied by people or other targets infrequently or irregularly.
  • 3. Frequent - The target zone is occupied for a large portion of the day or week by people or other targets.
  • 4. Constant - A target is present at all times, 24 hours a day, 7 days a week.

• Practical to move target out of target zone if mitigation is required?

  Yes

  No

• Is it practical to restrict access to target zone?

  Yes

  No

• History of failures: describe evidence of previous whole-tree failures on the site and estimate the time frame for how recently they occurred if possible.

  Yes

  No

• Topography

  Flat

  Sloped

• Estimation of the slope percentage (0% - 100%)

• Aspect: The compass direction that the slope is falling towards.

• Site Changes: Factors affecting the root system of the tree or the change in exposure of the tree to wind. Selected all that apply.

  Select None: No evidence of recent site changes Grade change: Soil was added or removed from site Site Clearing: adjacent trees, which may have blocked the wind, have been removed or significantly reduced. Changed soil hydrology: changes have been made that affect water flow in or out of the site. Roots cut: the root system has been cut or otherwise significantly damaged. Other: note applicable details or further information of site changes.

  • None: No evidence of recent site changes
  • Grade change: Soil was added or removed from site
  • Site Clearing: adjacent trees, which may have blocked the wind, have been removed or significantly reduced.
  • Changed soil hydrology: changes have been made that affect water flow in or out of the site.
  • Roots cut: the root system has been cut or otherwise significantly damaged.
  • Other: note applicable details or further information of site changes.

• Soil Conditions: factors that can affect the ability of the root system to mechanically support the tree, as well as the general health and vitality of the tree. select all that apply.

  Select Limited soil volume: soil volume limited by rocks, water table, building foundations, size of container or other factors. Saturated: soil saturated due to poor drainage, high water table, excess irrigation or location in a low area. may be saturated now or have a history of inundation. Shallow: rooting depth limited by one or more factors including high water table, rock ledges, compacted layers or underground structures such as culverts etc. Compaction: soil severely compacted, limiting the depth, spread and distribution of the root system. Pavement over roots: concrete, asphalt, pavers or other materials restricting root growth or water movement into the root zone. Other: note applicable details or further descriptions of soil condition factors.

  • Limited soil volume: soil volume limited by rocks, water table, building foundations, size of container or other factors.
  • Saturated: soil saturated due to poor drainage, high water table, excess irrigation or location in a low area. may be saturated now or have a history of inundation.
  • Shallow: rooting depth limited by one or more factors including high water table, rock ledges, compacted layers or underground structures such as culverts etc.
  • Compaction: soil severely compacted, limiting the depth, spread and distribution of the root system.
  • Pavement over roots: concrete, asphalt, pavers or other materials restricting root growth or water movement into the root zone.
  • Other: note applicable details or further descriptions of soil condition factors.

• Estimate percentage of the area within the drip line that is paved.

• Prevailing wind direction: A typical, consistent, moderate-to-strong wind, usually from a single direction, that has affected tree crown development.

• Common weather conditions: trees adapt to a number of climatic conditions if they occur regularly.

  Select Strong winds Heavy rain Flooding Tidal surges from high or king tide Other

  • Strong winds
  • Heavy rain
  • Flooding
  • Tidal surges from high or king tide
  • Other

• Trees Vigor: An assessment of overall tree health.

  Select Dead: tree is dead. Low: tree is weak, growing slowly and or under stress. Normal: tree has average Vigor for its species and site conditions. High: tree is growing well and appears to be free of significant health stress factors.

  • Dead: tree is dead.
  • Low: tree is weak, growing slowly and or under stress.
  • Normal: tree has average Vigor for its species and site conditions.
  • High: tree is growing well and appears to be free of significant health stress factors.

• Foliage: size and colour are an indication of tree health. Compare subject against a healthy specimen of the same species in the area if possible.

  Select None (Seasonal): a deciduous tree that has dropped its leaves. None (dead): a tree that has dropped its leaves because it is dead or dying. Normal: A percentage of foliage size and colour is normal for the species in this area. Chlorotic: A percentage of foliage that is yellowish green to yellow. Necrotic: A percentage of dead foliage in the crown

  • None (Seasonal): a deciduous tree that has dropped its leaves.
  • None (dead): a tree that has dropped its leaves because it is dead or dying.
  • Normal: A percentage of foliage size and colour is normal for the species in this area.
  • Chlorotic: A percentage of foliage that is yellowish green to yellow.
  • Necrotic: A percentage of dead foliage in the crown

• Estimate percentage

• Estimate percentage

• Estimate percentage

• Biotic disorders that are or may significantly affect the trees health or stability

  Select Damage from humans: poor pruning, damage from machinery (Mowers, whipper snippers etc), inappropriate use of herbicides, vandalism, soil compaction from foot, vehicle traffic or disruptive construction activity. Damage from animals: livestock can damage trees by grazing on low hanging foliage, debarking trunks and compacting the soil under trees. Birds and other animals may feed on foliage or strip back. Soil pathogens: A change to less favourable soil conditions such as anaerobic (very wet) may favour organisms which have negative effects on plant growth examples: Root Rot, collar rot etc. Insect infestation: note - insects can sometime be considered as a secondary problem and a symptom of a tree already under stress. Parasites: organisms that actively use the host's recourses in order to survive. Examples: Mistletoe (1 or 2 plants may not negatively impact a healthy tree). Strangler figs (Ficus sp.) As they grow, strangler figs compete with their host for sunlight, water, and nutrients. Over time, the aggressive root system of the fig can outcompete the host's roots, reducing the host's ability to sustain itself. This competition often leads to a steady decline in the host tree's health and eventual death. Vines: many species are fast growing and can rapidly out complete the host tree. Other None

  • Damage from humans: poor pruning, damage from machinery (Mowers, whipper snippers etc), inappropriate use of herbicides, vandalism, soil compaction from foot, vehicle traffic or disruptive construction activity.
  • Damage from animals: livestock can damage trees by grazing on low hanging foliage, debarking trunks and compacting the soil under trees. Birds and other animals may feed on foliage or strip back.
  • Soil pathogens: A change to less favourable soil conditions such as anaerobic (very wet) may favour organisms which have negative effects on plant growth examples: Root Rot, collar rot etc.
  • Insect infestation: note - insects can sometime be considered as a secondary problem and a symptom of a tree already under stress.
  • Parasites: organisms that actively use the host's recourses in order to survive. Examples: Mistletoe (1 or 2 plants may not negatively impact a healthy tree).
  • Strangler figs (Ficus sp.) As they grow, strangler figs compete with their host for sunlight, water, and nutrients. Over time, the aggressive root system of the fig can outcompete the host's roots, reducing the host's ability to sustain itself. This competition often leads to a steady decline in the host tree's health and eventual death.
  • Vines: many species are fast growing and can rapidly out complete the host tree.
  • Other
  • None

• Abiotic disorders: non-biological factors, such as environmental stress, nutrient deficiency or improper practices including overwatering or inappropriate planting conditions.

  Select Soil compaction Poor drainage Poor soil quality: poor physical structure or texture, pH issues, high salinity, lacking nutrients, toxic levels of chemicals. Sunburn: occurs when tissues of the trunk, branches, or exposed areas are damaged due to sudden or prolonged exposure to direct solar radiation. This often happens when those tissues were previously shaded and acclimated to lower light and heat levels. Heavy rain: may cause soil erosion or saturation, the weight of wet foliage may contribute to premature branch failure. Temperature extremes: extreme of both heat or cold will damage trees, particularly where extremes occur out of season. Changes to wind loading: neighbouring trees or structures have removed. This may expose the tree to new wind loading and contribute to structural failures. Mechanical damage: may include root damage from excavations or damage to the trunk from machinery contact. Other None

  • Soil compaction
  • Poor drainage
  • Poor soil quality: poor physical structure or texture, pH issues, high salinity, lacking nutrients, toxic levels of chemicals.
  • Sunburn: occurs when tissues of the trunk, branches, or exposed areas are damaged due to sudden or prolonged exposure to direct solar radiation. This often happens when those tissues were previously shaded and acclimated to lower light and heat levels.
  • Heavy rain: may cause soil erosion or saturation, the weight of wet foliage may contribute to premature branch failure.
  • Temperature extremes: extreme of both heat or cold will damage trees, particularly where extremes occur out of season.
  • Changes to wind loading: neighbouring trees or structures have removed. This may expose the tree to new wind loading and contribute to structural failures.
  • Mechanical damage: may include root damage from excavations or damage to the trunk from machinery contact.
  • Other
  • None

• Species failure profile: any known problems with the species.

• Wind exposure: assess factors that affect wind load on the tree

  Select Protected: trees or structures in the area significantly reduce wind velocity or the trees exposure to wind. Partial: other trees or structures near the tree moderately reduce the impact of wind on the tree. Full: the tree is fully exposed to wind Wind funnelling: wind may be funnelled or tunnelled (by buildings, canyons or large stand of trees) toward the tree increasing the wind velocity experienced by the tree.

  • Protected: trees or structures in the area significantly reduce wind velocity or the trees exposure to wind.
  • Partial: other trees or structures near the tree moderately reduce the impact of wind on the tree.
  • Full: the tree is fully exposed to wind
  • Wind funnelling: wind may be funnelled or tunnelled (by buildings, canyons or large stand of trees) toward the tree increasing the wind velocity experienced by the tree.

• Relative crown size: comparison of the trees crown size to trunk diameter.

  Small

  Medium

  Large

• Crown density: the relative wind transparency of the crown

  Select Sparse: crown allows a large degree of wind and light penetration. Normal: indicates moderate wind and light penetration. Dense: crown does not allow much light or wind penetration.

  • Sparse: crown allows a large degree of wind and light penetration.
  • Normal: indicates moderate wind and light penetration.
  • Dense: crown does not allow much light or wind penetration.

• Interior branches: increase wind resistance but also dampen branch movement.

  Select Few: little wind resistance and damping Normal: moderate wind resistance and damping Dense: significant wind resistance and damping

  • Few: little wind resistance and damping
  • Normal: moderate wind resistance and damping
  • Dense: significant wind resistance and damping

• Vines or mistletoe present: check box if present at moderate to high levels that increase weight or wind resistance.

  Select Vines Mistletoe Other

  • Vines
  • Mistletoe
  • Other

• Recent or expected changes to load factors: record any factors, recent or planned, that may significantly affect the load on any defects.

Assessment of Crown and Branches

• Unbalanced crown: Check box if foliage is not uniformly distributed

• Live crown ratio (LCR): ratio of the height of the live crown to the height of the entire tree (LCR=(Crown height/tree height)x100)

• Dead twigs or branches present

  Yes

  No

• Indicate percentage of crown that is dead and maximum diameter of dead branch/s

  Yes

  No

• Broken or cut branches remaining in crown

  Yes

  No

• Record the number of and size (Maximum diameter)

  Yes

  No

• Over-extended branches: check box if there are branches that extend beyond the tree’s canopy or that are excessively long with poor taper.

• Pruning history

  Select Crown cleaned: pruning of dead, dying, diseased, and broken branches from the tree crown. Thinned: selective removal of live branches to reduce crown density. Other pruning types include, but are not limited to, structural, pollarding, espalier, and vista, and may be included in your notes. Raised: removal of lower branches to provide clearance. Reduced: pruning to decrease tree height or spread by cutting to lateral branches. Topped: inappropriate pruning technique used to reduce tree size; characterised by internodal cuts. Lion-tailed: inappropriate pruning practice removing an excessive number of inner and/or lower lateral branches. Flush cuts: pruning cuts through (or removal of) the branch collar, causing unnecessary injury to the trunk or parent branches. Other: note any other pruning history that may affect the likelihood of failure

  • Crown cleaned: pruning of dead, dying, diseased, and broken branches from the tree crown.
  • Thinned: selective removal of live branches to reduce crown density. Other pruning types include, but are not limited to, structural, pollarding, espalier, and vista, and may be included in your notes.
  • Raised: removal of lower branches to provide clearance.
  • Reduced: pruning to decrease tree height or spread by cutting to lateral branches.
  • Topped: inappropriate pruning technique used to reduce tree size; characterised by internodal cuts.
  • Lion-tailed: inappropriate pruning practice removing an excessive number of inner and/or lower lateral branches.
  • Flush cuts: pruning cuts through (or removal of) the branch collar, causing unnecessary injury to the trunk or parent branches.
  • Other: note any other pruning history that may affect the likelihood of failure

• Cracks: separation in the wood in either a longitudinal (radial, in the place of ray cells) or transverse (across the stem) direction. Check box if present and briefly describe.

• Lightning damage: often evidenced by a centrally located line of sapwood damage and bark removal on either side in a spiral pattern on the trunk or branch.

• Codominant: branches of nearly equal diameter arising from a common junction and lacking a normal branch union. Check box if present and describe.

• Included bark—bark that becomes embedded in a union between branch and trunk, or between codominant stems, causing a weak structure. Check box if present.

• Weak attachments: branches that are codominant or that have included bark or splits at or below the junctions. Check box if present and describe.

• Cavity/Nest hole: openings from the outside into the heartwood area of the tree. Record the percentage of the branch circumference that has missing wood.

• Previous branch failures: check box if there is evidence of previous branch failures and describe briefly.

• Dead/Missing bark: check box if branches are dead or if areas of dead cambium are present where new wood will not be produced.

• Cankers, localized diseased areas on the branch; often sunken or discoloured: check box if relevant and add notes if they are of concern

• Galls, abnormal swellings of tissue caused by pests; may or may not be a defect: check box if relevant and add notes if they are of concern

• Burls, outgrowth on the trunk, branch, or roots; not usually considered a defect: check box if relevant and add notes if they are of concern

• Sapwood damage/decay: check box if there is mechanical damage or decay in the sapwood that may weaken the branch, or decay of dead or dying branches. Specify in notes if there is decay present.

• Conks (mushrooms, brackets): fungal fruiting structures; common, definite indicators of decay.

• Heartwood decay: check box if present and describe.

• Response growth: reaction wood or additional wood grown to increase the structural strength of the branch. Note location and extent.

• Condition(s) of concern—conditions in the crown and branches that may affect likelihood of failure. Note the main concern(s); if there are no concerns, select “none.”

  Yes

  None

• Part Size: part of the tree that may fail toward the target. Usually this is the diameter of the branch that can fall or the D.B.H of the tree.

• Fall Distance: record the distance that the tree or tree part will fall before hitting a target.

• Load on defect: a consideration of how much loading is expected on the tree part of concern, note the cause of loading.

  Minor

  Moderate

  significant

• Likelihood of failure: the rating for the crown and branches of greatest concern.

  Improbable

  Possible

  Probable

  Imminent

Trunk Assessment

• Dead/Missing bark: check box if a stem or codominant stem is dead or if areas of dead cambium are present where new wood will not be produced.

• Abnormal bark texture/colour: may indicate a fungal or structural problem with the trunk. Check box, if present, and add notes if it is a concern.

• Codominant stems: stems of nearly equal diameter arising from a common junction and lacking a normal branch union. Note the size, location, and number, if relevant, under Condition(s) of concern.

• Included bark: bark that becomes embedded in a union between branch and trunk, or between codominant stems, causing a weak structure.

• Cracks: separation in the wood in either a longitudinal (radial, in the plane of ray cells) or transverse (across the stem) direction. Check box if present and describe under Condition(s) of concern.

• Sapwood damage/decay: check box if there is mechanical or fungal damage in the sapwood that may weaken the trunk. If checked, indicate which one is present in the notes

• Cankers: localized diseased area on the branch; often sunken or discoloured.

• Galls: abnormal swelling of tissue caused by pests; may or may not be a defect.

• Burls: outgrowth on the trunk, branch, or roots; not usually considered a defect.

• Sap ooze: oozing of liquid that may result from infections or infestations under the bark. May or may not affect structure or stability. Check box if present.

• Lightning damage: often evidenced by a centrally located line of sapwood damage and bark removal on either side in a spiral pattern on the trunk or branch. Check box if present

• Heartwood decay: check box if present and identify/describe in notes

• Conks/Mushrooms—fungal fruiting structures; common, definite indicators of decay when on the trunk. Check box if present and identify/describe in notes.

• Cavity/Nest hole: openings from the outside into the heartwood area of the tree. Record the percentage of the trunk circumference that has missing wood, and the depth of the cavity in the notes.

• Poor taper: change in diameter over the length of the trunk, important for even distribution of mechanical stress. Check box if trunk has poor taper.

• Lean: angle of the trunk measured from vertical. Record the degree of lean in notes

• Lean corrected? The tree may have been able to correct the lean with new growth in the younger portions of the tree. Note conditions related to lean in the notes

• Response growth: reaction wood or additional wood grown to increase the structural strength of the trunk. Note location and extent.

• Condition(s) of concern—conditions in the crown and branches that may affect likelihood of failure. Note the main concern(s); if there are no concerns, select “none.”

  Yes

  None

• Part Size: part of the tree that may fail toward the target. Usually this is the diameter of the branch that can fall or the D.B.H of the tree.

• Fall Distance: record the distance that the tree or tree part will fall before hitting a target.

• Load on defect: a consideration of how much loading is expected on the tree part of concern, note the cause of loading.

  Minor

  Moderate

  significant

• Likelihood of failure: the rating for the crown and branches of greatest concern.

  Improbable

  Possible

  Probable

  Imminent

Roots and Root Collar

• Collar buried/Not visible: check box if the root collar is not visible. If possible, determine and note the depth belowground.

• Stem girdling: restriction or destruction of the trunk or buttress roots. Check box if it is a failure concern.

• Dead: check box if one or more structural support roots are dead.

• Decay—check box if present and identify/describe in notes

• Conks/Mushrooms: fungal fruiting structures; common, definite indicators of decay. Fungal fruiting structures away from the trunk in the turf or mulch may be due to the presence of a mycorrhizal fungus and, if so, do not pose a threat to the tree. Check box if present and identify/describe in notes.

• Ooze: seeping or exudation that can result from pest infestations or infections under the bark. Check box if present and describe in notes.

• Cavity: definite indicators of heartwood decay. Measure the size of the opening and record the percentage of the tree’s circumference affected in the notes

• Cracks: separation in the wood in either a longitudinal (radial, in the plane of ray cells) or transverse (across the stem) direction. Check box if present and describe in notes

• Cut/Damaged roots: check box if present. Measure and record the distance from the trunk to the cut in the notes

• Root plate lifting: soil cracking or lifting indicates the tree has been rocking, usually in high winds. Check box if present and include specific details in the notes.

• Soil weakness: check box if there is a soil condition affecting the anchorage of the tree’s root system. Include details in notes.

• Response growth: reaction wood or additional wood grown to increase the structural strength of the roots or root collar. Note location and extent.

• Condition(s) of concern—conditions in the crown and branches that may affect likelihood of failure. Note the main concern(s); if there are no concerns, select “none.”

  Yes

  None

• Part Size: part of the tree that may fail toward the target. Usually this is the diameter of the branch that can fall or the D.B.H of the tree.

• Fall Distance: record the distance that the tree or tree part will fall before hitting a target.

• Load on defect: a consideration of how much loading is expected on the tree part of concern, note the cause of loading.

  Minor

  Moderate

  significant

• Likelihood of failure: the rating for the crown and branches of greatest concern.

  Improbable

  Possible

  Probable

  Imminent

Target assessment

• Target description

• Tree part: specify the branch, trunk or root of concern in the notes.

  Branch

  Trunk

  Roots

• Condition(s) of concern: specify the concern with the tree part listed.

• The likelihood of failure (these categories are time dependent, the time frame must be considered.

  Select Improbable: the tree or tree part is not likely to fail during normal weather conditions and may not fail in extreme weather conditions within the specified time frame. Possible: failure may be expected in extreme weather conditions, but it is unlikely during normal weather conditions within the specified time frame. Probable: failure may be expected under normal weather conditions within the specified time frame. Imminent: failure has started or is most likely to occur in the near future, even if there is no significant wind or increased load. This is an infrequent occurrence for a risk assessor to encounter, and it may require immediate action to protect people from harm. The imminent category overrides the stated time frame.

  • Improbable: the tree or tree part is not likely to fail during normal weather conditions and may not fail in extreme weather conditions within the specified time frame.
  • Possible: failure may be expected in extreme weather conditions, but it is unlikely during normal weather conditions within the specified time frame.
  • Probable: failure may be expected under normal weather conditions within the specified time frame.
  • Imminent: failure has started or is most likely to occur in the near future, even if there is no significant wind or increased load. This is an infrequent occurrence for a risk assessor to encounter, and it may require immediate action to protect people from harm. The imminent category overrides the stated time frame.

• The likelihood of impacting a target

  Select Very low: the chance of the failed tree or tree part impacting the specified target is remote. Likelihood of impact could be very low if the target is outside the anticipated target zone or if occupancy rates are rare. Another example of very low likelihood of impact is people in an occasionally used area with protection against being struck by the tree failure due to the presence of other trees or structures between the tree being assessed and the targets. Low: there is a slight chance that the failed tree or tree part will impact the target. This is the case for people in an occasionally used area with no protection factors and no predictable direction of fall, a frequently used area that is partially protected, or a constant target that is well protected from the assessed tree. Examples are vehicles on an occasionally used service road next to the assessed tree, or a frequently used street that has a large tree providing protection between vehicles on the street and the assessed tree. Medium: the failed tree or tree part could impact the target but is not expected to do so. This is the case for people in a frequently used area when the direction of fall may or may not be toward the target. An example of a medium likelihood of impacting people could be passengers in a car traveling on an arterial street (frequent occupancy) next to the assessed tree with a large, dead branch over the street. High: the failed tree or tree part is likely to impact the target. This is the case when there is a constant target with no protection factors, and the direction of fall is toward the target.

  • Very low: the chance of the failed tree or tree part impacting the specified target is remote. Likelihood of impact could be very low if the target is outside the anticipated target zone or if occupancy rates are rare. Another example of very low likelihood of impact is people in an occasionally used area with protection against being struck by the tree failure due to the presence of other trees or structures between the tree being assessed and the targets.
  • Low: there is a slight chance that the failed tree or tree part will impact the target. This is the case for people in an occasionally used area with no protection factors and no predictable direction of fall, a frequently used area that is partially protected, or a constant target that is well protected from the assessed tree. Examples are vehicles on an occasionally used service road next to the assessed tree, or a frequently used street that has a large tree providing protection between vehicles on the street and the assessed tree.
  • Medium: the failed tree or tree part could impact the target but is not expected to do so. This is the case for people in a frequently used area when the direction of fall may or may not be toward the target. An example of a medium likelihood of impacting people could be passengers in a car traveling on an arterial street (frequent occupancy) next to the assessed tree with a large, dead branch over the street.
  • High: the failed tree or tree part is likely to impact the target. This is the case when there is a constant target with no protection factors, and the direction of fall is toward the target.

• Failure and Impact (Reference Matrix 1)

  Unlikely

  Somewhat

  Likely

  Very likely

• Consequences

  Select Negligible: no personal injury, low-value property damage, or disruptions that can be replaced or repaired. Minor: minor personal injury, low-to-moderate value property damage, or small disruption of activities. Significant: substantial personal injury, moderate- to high-value property damage, or considerable disruption of activities. Severe: serious personal injury or death, high-value property damage, or major disruption of important activities.

  • Negligible: no personal injury, low-value property damage, or disruptions that can be replaced or repaired.
  • Minor: minor personal injury, low-to-moderate value property damage, or small disruption of activities.
  • Significant: substantial personal injury, moderate- to high-value property damage, or considerable disruption of activities.
  • Severe: serious personal injury or death, high-value property damage, or major disruption of important activities.

• Risk Rating (Reference Matrix 2)

  Low

  Moderate

  High

  Extreme

• Notes, explanations, descriptions: describe any conditions or factors that are not well described elsewhere on the form. Include notes on anything you need to take into consideration for making ratings or recommendations.

• Mitigation options: list options for mitigating each hazard described starting from the most preferred. Calculate the Residual risk for each hazard after the mitigation you are recommending has been completed. Residual risk can be: Low, Moderate, High or Extreme.

• Overall tree risk rating: the highest risk determined for the tree and target of concern. If there is more than one part or target rating, the tree risk rating is the highest of the group.

  Low

  Moderate

  High

  Extreme

• Overall residual risk—risk remaining if the highest-risk tree part is mitigated.

  None

  Low

  Moderate

  High

  Extreme

• Data: indicate whether this assessment is final or preliminary.

  Preliminary

  Final

• Advanced assessment needed: note the reason for any advanced assessment recommended.

  Yes

  No

• Inspection limitations: factors that limited your ability to inspect the tree. Check all that apply and describe briefly.

  Select None Visibility Access Vines Root Collar Burried Other

  • None
  • Visibility
  • Access
  • Vines
  • Root Collar Burried
  • Other

• Date and time of approval

  Date

• Approver's signature

  Sign