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HomeMy WebLinkAboutRS_Arborist_Report_210407_v1 Title: Castro Short Plat Development Project ISA Level 2 Basic Tree Risk Assessment and Tree Protection Plan 12727 SE Petrovitsky Road Renton, WA 98058 Prepared for: Beyler Consulting LLC Attn: Camille Washington 5920 100th Street SW Suite 25 Lakewood, WA 98499 Prepared by: Urban Forestry Services | Bartlett Consulting Miles Becker ISA Certified Arborist® #PN-7808A ISA Tree Risk Assessment Qualified Date: April 7, 2021 Contents: Summary Introduction Observations Recommendations Levels of Assessment Descriptions Tree Protection Site Plan Tree Assessment Matrix General Tree Protection Guidelines Summary Sub-division of the Castro property in Renton, Washington will remove 42 out of 68 significant trees on the property. Tree removal is primarily being proposed for clearing and grading of the site in preparation for development. A few trees outside the clearing and grading limits are non-viable or a moderate risk to structures. The 36 percent of trees being retained will remain viable with proper protection measures before and during construction. Castro Short Plat – Renton, Washington – ISA Level 2 Basic Tree Assessment Urban Forestry Services | Bartlett Consulting April 7, 2021 Page 2 Introduction The property at 12727 SE Petrovitsky Road in Renton, Washington is planned for sub- division into three plots and a tree protection tract. The project is subject to the minimum tree retention requirements, tree protection measures, and tree replacement outlined in Renton Municipal Code (RMC) 4-4-130. Specifically, the applicable sections for this property are: • H.1.a – the minimum percentage of trees to be retained is 30 percent, • H.1.e.i – each tree removed below the 30 percent requirement will be replaced with 12 caliper inches of replacement trees, • H.2 – a tree protection tract area set aside for the protection of trees can be used to retain trees to meet the minimum requirements in place of retaining trees on individual sub-division plots, and • H.9 – trees to be retained shall not have construction activity under the dripline, the critical root zone will be protected with fencing, and other protection measures need to be implemented before and during construction. Along with the permit application for land clearing, the property owner or their representative needs to submit a tree retention and inventory plan with that includes: • Species, size, health, and viability, • Limits of disturbance (LOD), • Maintenance protocol for trees retained in a tract, • A description of impacts on retained trees from removing trees, and • A City of Renton Tree Retention Worksheet. We were asked by Camille Washington of Beyler Consulting LLC, on behalf of the property owner, Alex Castro, to assess the trees and provide an arborist report with the elements required by the City of Renton. I met Mr. Castro on-site March 18, 2021 to assess the trees identified on the site plan provided by Ms. Washington. The site survey did not include all significant trees with a minimum 6-inch trunk diameter measured at 56 inches above grade (DBH). Property boundaries were only clearly marked on the east side of the property and the locations of the proposed plot lines were not marked. I assessed all significant trees I estimated to be on the property and added their approximate location to the attached Tree Assessment Site Plan. The time frame for this ISA Level 2 Basic Tree Risk Assessment is 3 years from the date of inspection. Size, health, and condition details, as well as photos of every tree covered in this report are provided in the attached Tree Assessment Matrix. Trees were marked in the field with numbered aluminum tags that correspond to the numbers in this report. Observations The 68 trees I assessed are generally in good condition, received a low risk rating, and are viable, with some exceptions. Thirty-eight trees were selected by the developer to remove for clearing and grading, three trees are non-viable, and one tree is likely to fail and damage property. Most of the remaining trees are concentrated in groves in the southeast corner of the property where Tree Tract A will be (see the Tree Assessment Site Plan). Several of them have had failed stems and a new leader has regrown with a solidly attached union. Tree #888 has two codominant stems with a weak union. One stem is leaning towards a Castro Short Plat – Renton, Washington – ISA Level 2 Basic Tree Assessment Urban Forestry Services | Bartlett Consulting April 7, 2021 Page 3 house on the neighboring property and it is a moderate risk that can be managed while still retaining the tree. Tree #893 has multiple leaders in the top of the crown that could be weakly attached and prone to failure. I was not able to visually assess the unions from the ground. There are two landmark trees with a DBH equal to or greater than 30 inches. Tree #852 is a Douglas fir (Pseudotsuga menziesii) with a 49.5-inch DBH. Tree #874 is a Douglas fir with a 30.9-inch DBH. Both trees are within the proposed clearing and grading limits proposed by the developer. Recommendations Tree Retention Of the 68 significant trees assessed on the property, 26 can be retained. The trees identified as viable, a low risk, and outside the clearing and grading limits are identified in the attached Tree Assessment Matrix and Tree Assessment Site Plan. Thirty-eight percent of significant trees will be retained on-site, which is above the minimum 30 percent requirement. Most of the retained trees are within the boundaries of the proposed protection area Tree Tract A. They are not evenly distributed among the three new sub-divided plots and therefore will need to meet the requirements of RMC 4-4-130.H.2. Tree Protection Trees in Tree Tract A will be sufficiently protected by: • Erecting 6-foot tall fencing around the perimeter of the future tract area prior to the start of construction • Placing a 3-inch layer of wood chip mulch within the dripline of each tree. Keep the mulch a few inches away from the trunk. Wood chips are recommended over bark mulch which is not as effective at retaining soil moisture and promoting beneficial soil organisms. • Keeping all construction activity outside the protected area, including the storage of materials and vehicle access • Having an ISA Certified Arborist® visit the site at least once during construction to monitor the effectiveness of the tree protection measures and make additional recommendations as needed, such as pruning or watering. All other trees recommended for retention can be protected with the same measures applied to the LOD. The LOD for retained trees is generally the average dripline radius, which is listed for each tree in the attached Tree Assessment Site Plan. The trees recommended for retention are expected to be wind firm and viable after the removal of the other trees. Castro Short Plat – Renton, Washington – ISA Level 2 Basic Tree Assessment Urban Forestry Services | Bartlett Consulting April 7, 2021 Page 4 Tree Replacement The number of proposed retained trees is above the minimum 30 percent requirement. Consequently, replacement planting is not required. The developer is proposing to plant trees and landscaping mainly on the perimeter of the property. Once established, the new trees will contribute to the total tree canopy of the property. All new trees should be a minimum of 2-inch caliper for deciduous species and 6 feet tall for conifer species. The project landscape architect will provide planting and maintenance specifications for successful establishment. Let me know if you have questions regarding this Level 2 Basic Tree Risk Assessment and tree protection report. I can be reached at 360-503-9654 or mbecker@bartlett.com. Tree Risk Assessment Level Descriptions The tree risk assessment process is based on factors present at the time of assessment. Because trees are living, growing things that change in size and condition over time, the tree assessment process must also recognize and anticipate where and when future assessments should be performed. The Tree Risk Assessment Qualification (TRAQ) training and methodology, developed and administered by the International Society of Arboriculture is the best available methodology for tree risk assessment at this time. There are three levels of assessment that may be considered and employed according to the expectations of the owner or manager, conditions of the site and of the trees involved: Level 1 Limited Visual Assessment: Includes a broad overview of an individual tree or group of trees near specified targets, conducted to identify obvious defects or other conditions of concern. A limited visual assessment typically focuses on identifying trees with imminent and/or probable likelihood of failure. Level 1 assessments do not always meet the criteria for a "risk assessment" if they do not include documented analysis and evaluation of individual trees. This level is typically used for large populations of trees as a means to quickly identify trees with imminent and/or probable likelihood of failure, at a specified schedule and/or immediately after storms. Level 1 assessments may be done as walk-by, drive-by or aerial patrols as requested by the tree owner or manager. They may not provide enough information to develop risk mitigation recommendations. They can help identify specific areas and/or trees for further inspection at Level 2 or 3. Trees found to require a Level 2 Basic Assessment are assessed, mapped and documented at the higher level at this time. Trees determined to need a Level 3 Advanced Tree Assessment are documented and recommended for additional testing and analysis. The owner is notified with options discussed. Level 2 Basic Assessment: This is a detailed visual inspection of a tree and its surrounding site, and a synthesis of the information collected. It requires that a tree risk assessor walk completely around the tree, looking at the site, buttress roots, trunk, and branches. This basic assessment may include the use of simple tools to gain additional information about the tree or defects. Our Level 2 Basic Assessment Trees are all typically tagged, mapped and information gathered and retained for each tree. Risk mitigation recommendations may be derived from this level of inspection. Defects found in a Level 2 Basic Tree Assessment may require a Level 3 assessment for further testing and analysis. The owner is notified with options discussed. Level 3 Advanced Assessment: Advanced assessments are performed to provide more highly detailed information about specific tree components, defects, targets or site conditions. An advanced assessment is performed in conjunction with or after a Level 2 Basic Assessment if the assessor determines the need for (requires) additional information. This level is particularly useful where there are concerns about trees that may otherwise be of high value, or to obtain better information on how serious or extensive a particular defect is. The Level 3 Advanced Tree assessment may include but not be limited to a root crown inspection with air spade, Resistograph or Tomograph use to determine sound wood or an aerial crown inspection. The preliminary Level 1 Limited Visual Assessment if requested would help determine where field assessments at Level 2 and Level 3 will be needed. 15119 Mc Lean Road Mount Vernon, WA. 98273 Office: 360 - 503 - 9679 Fax: 360 - 428 - 1822 Tree Assessment Site Plan 12727 SE Petrovitsky Road Renton, WA 98058 © UFS| BC April 7, 2021 These documents have been prepared specifically for the above-named project. They are not suitable for use on other projects, or in other loca-tions, and/ or without the approval and participation of the Bartlett Tree Expert Company. MAP SYMBOL KEY: Base Plan Source: HDR UFS|BC NOT TO SCALE NORTH Recommended Action Retain Remove: mitigate risk Remove: non-viable Remove: clearing and grading Remove: owner proposed Tree protection fencing #841 #847 #848 #849 #850 #845 #854 #844 #853 #846 #842 #843 #855 #856 #857 #858 #859 #860 #861 #862 #863 #852 #851 #864 #865 #866 #867 #868 #869 #870 #871 #872 #873 #874 #132 #131 #133 #138 #139 #135 #136 #134 #880 #881 #879 #882 #883 #884 #885 #886 #887 #888 #893 #894 #895 #896 #897 #898 #899 #130 #892 #891 #890 #889 #878 #877 #876 #875 Tree Tract A Proposed Roadway Tree # DBH(in) Species LOD(ft) 841 8.9 Bigleaf maple 10 842 23.4 Black cottonwood 15 843 9.2 Bigleaf maple 15 844 15.6 Black cottonwood 12 845 25.7 Douglas fir 13 846 8.8 Douglas fir 9 847 21.9 Douglas fir 17 848 17.8 Douglas fir 13 849 19.6 Douglas fir 16 850 11.8 Vine maple 10 851 13.5 Douglas fir 12 852 49.5 Douglas fir 19 853 10.6 Bigleaf maple 10 854 17.5 Douglas fir 12 855 25.7 Douglas fir 15 856 23.5 Douglas fir 15 857 17.6 Douglas fir 16 858 22.3 Douglas fir 18 859 19.2 Douglas fir 15 Tree # DBH(in) Species LOD(ft) 860 16.7 Douglas fir 14 861 18.5 Douglas fir 14 862 13.5 Douglas fir 12 863 12.1 Douglas fir 9.5 864 19.1 Douglas fir 11.75 865 27.3 Douglas fir 16 866 15 Douglas fir 9.75 867 21.2 Douglas fir 15.75 868 12 Douglas fir 7.5 869 14.9 Douglas fir 8.5 870 28.2 Douglas fir 15.5 871 18.9 Shore pine 17 872 26.5 Red alder 19 873 22.7 Sitka spruce 14 874 30.6 Douglas fir 12 875 6 Norway maple 9.5 876 15.5 Douglas fir 18 877 10.9 Douglas fir 12 878 8.9 Douglas fir 8 Tree # DBH(in) Species LOD(ft) 879 22.2 Douglas fir 13 880 7.1 Douglas fir 8 881 8.9 Douglas fir 8 882 17.7 Douglas fir 12 883 13.1 Douglas fir 9 884 17.2 Douglas fir 13 885 9.8 Douglas fir 5 886 13.2 Douglas fir 9 887 10 Douglas fir 9 888 29.8 Douglas fir 15 889 22 Douglas fir 11.75 890 19.7 Douglas fir 14.5 891 6.5 Douglas fir 9 892 7.8 Douglas fir 6 893 12.1 Douglas fir 10 894 13.7 Douglas fir 11 895 10.5 Douglas fir 10 896 10.2 Douglas fir 10 897 9.2 Red alder 9 Tree # DBH(in) Species LOD(ft) 898 8.1 Douglas fir 11 899 6.8 Douglas fir 8 130 7.5 Douglas fir 8 131 27 Douglas fir 18 132 11 Red alder 11 133 27.7 Scouler's willow 14.75 134 21.2 Douglas fir 15 135 12.9 Red alder 12 136 22.2 Douglas fir 18 138 27.3 Douglas fir 21 139 9.8 Douglas fir 12 Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 130 Fair to Good FairDouglas fir 7.5 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Remove for construction Recommendations Pseudotsuga menziesii There is a large wound at the base of the tree that will likely be compartmentalized and not significantly affect the likelihood of failure nor viability. Possibly outside the boundaries of proposed Tree Tract A.Notes/DefectsCRZ (ft) 7.58.0 1 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 131 Good GoodDouglas fir 27.0 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Remove for construction Recommendations Pseudotsuga menziesii This is a healthy tree.Notes/DefectsCRZ (ft) 27.018.0 2 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 132 Fair FairRed alder 11.0 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Retain Recommendations Alnus rubra There is some minor dieback in the crown. The tree is viable.Notes/DefectsCRZ (ft) 11.011.0 3 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 133 Fair to Good PoorScouler's willow 19.6 Species DBH (in)Drip Rad.Vigor Structure Risk Moderate Pres Value Remove to reduce risk Recommendations Salix scouleriana One stem is partially failing over the fence. The other stem has a large wound with decay present.Notes/DefectsCRZ (ft) 27.714.8 4 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 134 Fair to Good Poor to FairDouglas fir 21.2 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Remove for development Recommendations Pseudotsuga menziesii There is a wound at the base of the tree. It is viable.Notes/DefectsCRZ (ft) 21.215.0 5 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 135 Poor to Fair FairRed alder 12.9 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Remove, non-viable Recommendations Alnus rubra There is significant dieback in the crown. The tree is in decline and not viable.Notes/DefectsCRZ (ft) 12.912.0 6 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 136 Good GoodDouglas fir 22.2 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Remove for development Recommendations Pseudotsuga menziesii This is a healthy tree.Notes/DefectsCRZ (ft) 22.218.0 7 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 138 Good GoodDouglas fir 27.3 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Retain Recommendations Pseudotsuga menziesii This is a healthy tree.Notes/DefectsCRZ (ft) 27.321.0 8 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 139 Good GoodDouglas fir 9.8 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Retain Recommendations Pseudotsuga menziesii This is a healthy tree.Notes/DefectsCRZ (ft) 9.812.0 9 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 841 Fair Poor to FairBigleaf maple 8.9 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Remove for development Recommendations Acer macrophyllum The tree has a slight lean towards the road. There is some dead wood exposed at the base. It is a small tree with low preservation value but it is viable.Notes/DefectsCRZ (ft) 8.910.0 10 Date: 1/22/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 842 Fair to Good Fair to GoodBlack cottonwood 23.4 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Remove for development Recommendations Populus trichocarpa The top is curved but unlikely to fail. The branches are unlikely to fail and they would have minor consequences.Notes/DefectsCRZ (ft) 23.415.0 11 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 843 Fair to Good FairBigleaf maple 9.2 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Remove for development Recommendations Acer macrophyllum There is some dead in the base of the tree but it is viable.Notes/DefectsCRZ (ft) 9.215.0 12 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 844 Good GoodBlack cottonwood 15.6 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Remove for development Recommendations Populus trichocarpa This is a stable tree with good trunk taper and a 50 percent live crown to tree height ratio (LCR).Notes/DefectsCRZ (ft) 15.612.0 13 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 845 Fair to Good Fair to GoodDouglas fir 25.7 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Remove for development Recommendations Pseudotsuga menziesii This is a healthy tree with a stable form.Notes/DefectsCRZ (ft) 25.713.0 14 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 846 Fair to Good Fair to GoodDouglas fir 8.8 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Remove for development Recommendations Pseudotsuga menziesii This is a small tree with a self-corrected lean and mechanical wound at the base of the tree similar to some others in the group.Notes/DefectsCRZ (ft) 8.89.0 15 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 847 Good GoodDouglas fir 21.9 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Remove for development Recommendations Pseudotsuga menziesii This is a stable tree with a self-corrected lean to the north.Notes/DefectsCRZ (ft) 21.917.0 16 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 848 Fair to Good FairDouglas fir 17.8 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Remove for development Recommendations Pseudotsuga menziesii The tree has a narrow crown that is asymmetrical. It is stable if retained as part of the group of trees.Notes/DefectsCRZ (ft) 17.813.0 17 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 849 Good Fair to GoodDouglas fir 19.6 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Remove for development Recommendations Pseudotsuga menziesii There are some superficial mechanical wounds on the tree. Failure is unlikely.Notes/DefectsCRZ (ft) 19.616.0 18 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 850 Dying/Dead Dying/DeadVine maple 11.8 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Remove, non-viable Recommendations Acer circinatum There is advanced decay in both codominant stems and 90 percent mortality in the crown. It is not viable.Notes/DefectsCRZ (ft) 11.810.0 19 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 851 Good Fair to GoodDouglas fir 13.5 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Remove for development Recommendations Pseudotsuga menziesii This is a stable tree with a self-corrected lean.Notes/DefectsCRZ (ft) 13.512.0 20 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 852 Good GoodDouglas fir 49.5 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Remove for development Recommendations Pseudotsuga menziesii The tree has excellent form with good trunk taper and 80 percent LCR. There are some dead branches hanging in the crown that should be cleaned out.Notes/DefectsCRZ (ft) 49.519.0 21 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 853 Fair to Good GoodBigleaf maple 10.6 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Retain Recommendations Acer macrophyllum This is a healthy tree in good condition at the top of a short slope.Notes/DefectsCRZ (ft) 10.610.0 22 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 854 Good GoodDouglas fir 17.5 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Remove for development Recommendations Pseudotsuga menziesii This tree is in good condition with superficial mechanical wounds at the base. It is at the end of the row of fir trees.Notes/DefectsCRZ (ft) 17.512.0 23 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 855 Good GoodDouglas fir 25.7 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Remove for development Recommendations Pseudotsuga menziesii This is a stable and healthy tree.Notes/DefectsCRZ (ft) 25.715.0 24 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 856 Good GoodDouglas fir 23.5 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Remove for development Recommendations Pseudotsuga menziesii This is a stable and healthy tree.Notes/DefectsCRZ (ft) 23.515.0 25 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 857 Good GoodDouglas fir 17.6 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Remove for development Recommendations Pseudotsuga menziesii This is a stable and healthy tree.Notes/DefectsCRZ (ft) 17.616.0 26 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 858 Good GoodDouglas fir 22.3 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Remove for development Recommendations Pseudotsuga menziesii This is a stable and healthy tree.Notes/DefectsCRZ (ft) 22.318.0 27 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 859 Good GoodDouglas fir 19.2 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Remove for development Recommendations Pseudotsuga menziesii This is a stable and healthy tree.Notes/DefectsCRZ (ft) 19.215.0 28 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 860 Good Fair to GoodDouglas fir 16.7 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Remove for development Recommendations Pseudotsuga menziesii This is a stable and healthy tree.Notes/DefectsCRZ (ft) 16.714.0 29 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 861 Fair to Good Fair to GoodDouglas fir 18.5 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Remove for development Recommendations Pseudotsuga menziesii This is a stable and healthy tree. The tree has a slight lean south and a mechanical wound at the base.Notes/DefectsCRZ (ft) 18.514.0 30 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 862 Good Fair to GoodDouglas fir 13.5 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Remove for development Recommendations Pseudotsuga menziesii This tree has poor to moderate trunk taper and it is tightly spaced with 8 feet between trees.Notes/DefectsCRZ (ft) 13.512.0 31 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 863 Good Fair to GoodDouglas fir 12.1 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Remove for development Recommendations Pseudotsuga menziesii This tree is at the corner of the row. The crown is asymmetrical and the trunk has poor taper. Failure is unlikely if retained with the other trees.Notes/DefectsCRZ (ft) 12.19.5 32 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 864 Good Fair to GoodDouglas fir 19.1 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Remove for development Recommendations Pseudotsuga menziesii The crown is asymmetrical and the trunk has poor taper. Failure is unlikely if retained with the other trees.Notes/DefectsCRZ (ft) 19.111.8 33 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 865 Good GoodDouglas fir 27.3 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Remove for development Recommendations Pseudotsuga menziesii This is a stable and healthy tree at the top of a short slope.Notes/DefectsCRZ (ft) 27.316.0 34 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 866 Fair to Good Fair to GoodDouglas fir 15.0 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Remove for development Recommendations Pseudotsuga menziesii The tree has a narrow crown and a low LCR. Retain it only as part of a group of trees.Notes/DefectsCRZ (ft) 15.09.8 35 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 867 Good GoodDouglas fir 21.2 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Remove for development Recommendations Pseudotsuga menziesii This is a stable, healthy tree.Notes/DefectsCRZ (ft) 21.215.8 36 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 868 Fair FairDouglas fir 12.0 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Remove for development Recommendations Pseudotsuga menziesii This is a tree with a narrow crown from competition with neighboring trees. Retain it only as part of a group.Notes/DefectsCRZ (ft) 12.07.5 37 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 869 Fair FairDouglas fir 14.9 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Remove for development Recommendations Pseudotsuga menziesii This is a tree with a narrow crown from competition with neighboring trees. Retain it only as part of a group.Notes/DefectsCRZ (ft) 14.98.5 38 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 870 Good GoodDouglas fir 28.2 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Remove for development Recommendations Pseudotsuga menziesii This is a healthy, stable tree.Notes/DefectsCRZ (ft) 28.215.5 39 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 871 Fair GoodShore pine 18.9 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Remove for development Recommendations Pinus contorta var. contorta Some of the foliage is chlorotic, indicating the tree is stressed, possibly due to drought.Notes/DefectsCRZ (ft) 18.917.0 40 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 872 Good FairRed alder 26.5 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Remove for development Recommendations Alnus rubra The tree has a history of branch failure but it is in decent condition and viable.Notes/DefectsCRZ (ft) 26.519.0 41 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 873 Good GoodSitka spruce 22.7 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Retain Recommendations Picea sitchensis This is a healthy and stable tree.Notes/DefectsCRZ (ft) 22.714.0 42 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 874 Poor to Fair GoodDouglas fir 30.6 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Remove for development Recommendations Pseudotsuga menziesii The tree is starting to thin at the top. It has a stable form with good trunk taper and 75 percent LCR. The limit of disturbance (LOD) is 12 feet.Notes/DefectsCRZ (ft) 30.612.0 43 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 875 Good Fair to GoodNorway maple 6.0 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Retain Recommendations Acer platanoides This is a small healthy tree.Notes/DefectsCRZ (ft) 6.09.5 44 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 876 Good FairDouglas fir 15.5 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Retain Recommendations Pseudotsuga menziesii The top of this tree previously failed. The new leader looks solid.Notes/DefectsCRZ (ft) 15.518.0 45 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 877 Good FairDouglas fir 10.9 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Retain Recommendations Pseudotsuga menziesii The top of the tree previously failed. The new top is solid.Notes/DefectsCRZ (ft) 10.912.0 46 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 878 Good FairDouglas fir 8.9 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Retain Recommendations Pseudotsuga menziesii The top of the tree previously failed. The new top is solid.Notes/DefectsCRZ (ft) 8.98.0 47 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 879 Fair FairDouglas fir Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Retain Recommendations Pseudotsuga menziesii The tree has codominant stems that are unlikely to fail.Notes/DefectsCRZ (ft) 22.213.0 48 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 880 Good GoodDouglas fir 7.1 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Retain Recommendations Pseudotsuga menziesii This is a small healthy tree.Notes/DefectsCRZ (ft) 7.18.0 49 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 881 Good Fair to GoodDouglas fir 8.9 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Retain Recommendations Pseudotsuga menziesii This is a healthy small tree.Notes/DefectsCRZ (ft) 8.98.0 50 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 882 Fair to Good FairDouglas fir 17.7 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Retain Recommendations Pseudotsuga menziesii The tree has poor trunk taper and 30 percent LCR. Retain it only as part of a group.Notes/DefectsCRZ (ft) 17.712.0 51 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 883 Good FairDouglas fir 13.1 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Retain Recommendations Pseudotsuga menziesii There are two spike stems growing off the side of the main trunk at approximately 35 feet high that should be pruned out to reduce the likelihood of failure in the future.Notes/DefectsCRZ (ft) 13.19.0 52 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 884 Good Fair to GoodDouglas fir 17.2 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Retain Recommendations Pseudotsuga menziesii The tree has 30 percent LCR and moderate trunk taper. Retain it only as part of a group.Notes/DefectsCRZ (ft) 17.213.0 53 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 885 Good PoorDouglas fir 9.8 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Remove, non-viable. Recommendations Pseudotsuga menziesii The tree is suppressed with very few branches at the top. It is a low risk but not viable.Notes/DefectsCRZ (ft) 9.85.0 54 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 886 Good FairDouglas fir 13.2 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Retain Recommendations Pseudotsuga menziesii The top previously failed and the new leader is solid.Notes/DefectsCRZ (ft) 13.29.0 55 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 887 Good FairDouglas fir 10.0 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Retain Recommendations Pseudotsuga menziesii The top previously failed and the new leader is solid.Notes/DefectsCRZ (ft) 10.09.0 56 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 888 Good PoorDouglas fir 21.1 Species DBH (in)Drip Rad.Vigor Structure Risk Moderate Pres Value Retain Remove weak codominant stem Recommendations Pseudotsuga menziesii There are two codominant stems starting at 3 feet on the trunk with included bark and a weak union. One stem leaning east towards the neighboring residence should be removed to reduce risk.Notes/DefectsCRZ (ft) 29.815.0 57 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 889 Good Fair to GoodDouglas fir 22.0 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Retain Recommendations Pseudotsuga menziesii The crown is asymmetrical and the tree has a low likelihood of failure.Notes/DefectsCRZ (ft) 22.011.8 58 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 890 Fair to Good FairDouglas fir 19.7 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Retain Recommendations Pseudotsuga menziesii The tree has an asymmetrical crown and low likelihood of failure.Notes/DefectsCRZ (ft) 19.714.5 59 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 891 Good Poor to FairDouglas fir 6.5 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Retain Recommendations Pseudotsuga menziesii This is a small suppressed tree with a mechanical wound at the base. It is not viable.Notes/DefectsCRZ (ft) 6.59.0 60 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 892 Good FairDouglas fir 7.8 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Retain Recommendations Pseudotsuga menziesii This is a healthy tree with a kink in the top where it previously failed.Notes/DefectsCRZ (ft) 7.86.0 61 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 893 Good FairDouglas fir 12.1 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Retain Reduce stems Recommendations Pseudotsuga menziesii The tree has multiple leaders at the top that should be reduced to a single stem.Notes/DefectsCRZ (ft) 12.110.0 62 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 894 Good Fair to GoodDouglas fir 13.7 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Retain Recommendations Pseudotsuga menziesii The tree has an asymmetrical crown but it is unlikley to fail.Notes/DefectsCRZ (ft) 13.711.0 63 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 895 Good FairDouglas fir 10.5 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Retain Recommendations Pseudotsuga menziesii The tree has a slight lean and asymmetrical crown to the north. It is unlikely to fail.Notes/DefectsCRZ (ft) 10.510.0 64 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 896 Fair FairDouglas fir 10.2 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Retain Recommendations Pseudotsuga menziesii The tree has a self-corrected lean to the east and it is unlikely to fail.Notes/DefectsCRZ (ft) 10.210.0 65 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 897 Poor FairRed alder 9.2 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Remove for construction Recommendations Alnus rubra There is some dieback in the small crown. The tree is viable but it has low preservation value. Possibly outside the boundaries of proposed Tree Tract A.Notes/DefectsCRZ (ft) 9.29.0 66 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 898 Good PoorDouglas fir 8.1 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Remove for construction Recommendations Pseudotsuga menziesii The trunk is growing around a piece of metal attached to it that will eventually weaken the tree and increase the likelihood of failure. There is a mechanical wound on the trunk higher up. Possibly outside the boundaries of proposed Tree Tract A.Notes/DefectsCRZ (ft) 8.111.0 67 Date: 3/18/2021 4/7/2021 Field Work Completed: Tree Assessment Matrix Castro Short Plat Urban Forestry Services l Bartlett Consulting 15119 McLean Road Mount Vernon, WA 98273 Renton Tree 899 Fair Fair to GoodDouglas fir 6.8 Species DBH (in)Drip Rad.Vigor Structure Risk Low Pres Value Remove for construction Recommendations Pseudotsuga menziesii This is a healthy small tree. Possibly outside the boundaries of proposed Tree Tract A.Notes/DefectsCRZ (ft) 6.88.0 68 Date: 3/18/2021 4/7/2021 Field Work Completed: General Tree Protection Guidelines By Urban Forestry Services| Bartlett Consulting 2019 Page 1 of 4 General Tree Protection Guidelines 1. Responsibilities: These Guidelines pertain to any disturbance, use or activity within the Critical Root Zone of any retained tree on this project. See attached Critical Root Zone Explanation for reference. The owner’s arborist and general contractor shall meet on-site before any site work begins, to review and designate the most appropriate methods to be used to protect the retained trees during construction. These guidelines apply to work provided by all contractors and sub-contractors on the project. The project consulting arborist shall be contacted prior to any work that may need to enter the tree protection fencing. At least two days notice shall be provided to the project consulting arborist. A proposed method for work shall be provided to the arborist. This method shall be reviewed by the project consulting arborist and either approval and / or comments provided by the project consulting arborist prior to commencing works within the tree protection area. He or she should be notified within 8 hours should any injury occur to any protected tree or its larger roots (greater than 2-inch diameter) so that appropriate assessment and/or treatment may be made. 2. Soil Disturbance: No soil disturbance shall take place before tree protection fences are installed. All evaluated trees to be retained within these areas are clearly illustrated on the Site Plan. 3. Designated Tree Removals: The owner’s arborist and contractor shall confirm on site which trees are to be removed and those to be retained. Directional felling and removal of trees will be completed with great care to avoid any damage to the trunks, limbs, and critical root zones of the retained trees. 4. The Tree Protection Site Plan, when provided, shows the recommended location of the Tree Protection Fence (TPF). Immediately after the clearing limits and grading stakes are set in the field, the owner’s arborist, during review and discussion with the contractor, will make a final determination on the tree protection requirements depending on construction limits and estimated impact on major roots and soil condition. The arborist may adjust clearing limits in the field so that, in his/her opinion, tree roots and soils are protected while necessary work can proceed. 5. The Tree Protection Fence (TPF) shall be installed along the clearing limits, with special consideration of the Critical Root Zone (CRZ) of trees to be preserved. The CRZ of a tree is generally described as an area equal to 1-foot radius for every 1-inch diameter of tree. For example, a 10-inch diameter tree has a CRZ of 10-foot radius. Work within the CRZ may be limited to hand work or alternate method of construction. General Tree Protection Guidelines By Urban Forestry Services| Bartlett Consulting 2019 Page 2 of 4 The Tree Protection Fence (TPF) shall be constructed with steel posts driven into the ground with 6-ft. chain link fence attached. Upon consultation with the contractor, the arborist shall determine the placement of the fence and the extent and method of clearing that may be done near preserved trees. Additional follow-up determinations may be required as work progresses on the project. See attached Critical Root Zone Explanation. No parking, storage, dumping, or burning of materials is allowed beyond the clearing limits or within the Tree Protection Fence. The TPF shall not be moved without authorization by the owner’s arborist or City Arborist. The TPF shall remain in place for the duration of the project. Work within this area shall be reviewed with and approved by the owner’s arborist. Call Urban Forestry Services| Bartlett Consulting at 360-428-5810 with questions. 6. Silt Fence: If a silt fence is required to be installed within the Critical Root Zone of a retained tree, the bottom of the silt fence shall not be buried in a trench, but instead, folded over and placed flat on the ground. The flat portion of the silt fence shall be covered with gravel or soil for anchorage. 7. CRZ over Hardscape: Where the Critical Root Zone (CRZ) includes an area covered by hardscape, the TPF can be placed along the edge of the hardscape if and until it is removed. After hardscape removal, the available CRZ should be backfilled with topsoil up to 6 inches deep and protected with the TPF. Incorporation of topsoil into the existing sub-grade shall be determined by the consulting arborist. Where applicable a specification for topsoil will be provided or approved by Urban Forestry Services | Bartlett Consulting. 8. Tree Protection Signs shall be attached to the fence only and shall be shown as required on the Site Plan. They should read “Protect Critical Root Zone (CRZ) of trees to be retained. No soil disturbance, parking, storage, dumping, or burning of materials is allowed within the Tree Protection Barrier. " Monetary fines, based on the appraised dollar value of the retained trees may also be included on these signs. Telephone contact details for the project consulting arborist should also be included in the sign. 9. Soil Protection within the Critical Root Zone (CRZ): Where vehicular access, temporary work pad or storage pad is required within the CRZ of any preserved tree that is not protected with hardscape, the soil shall be protected with 18” of woodchips and/or plywood or metal sheets, or a combination of both, to protect from soil compaction and damage to roots of retained trees. A biodegradable coir mat netting is recommended to be placed on the existing grade before woodchip placement to protect the condition and confirm the location of the existing grade. The netting is a valuable benchmark upon removal of the material within the CRZ. 10. Landscape Plans, Irrigation Design and Installation Details: Great care shall be exercised when landscaping within the Critical Root Zone (CRZ) of any tree. Roots of preserved trees and other vegetation shall not be damaged by planting or installation of irrigation lines. The owner’s General Tree Protection Guidelines By Urban Forestry Services| Bartlett Consulting 2019 Page 3 of 4 arborist shall review the Landscape Plan for any potential design and tree preservation conflicts and approve related irrigation and landscape installation activities within the CRZ of retained trees. A proposed method for work shall be provided to and approved by the arborist. 11. Backfill and Grade Changes: The owner’s arborist will determine to what extent backfilling may be allowed within the Critical Root Zone of a preserved tree, and if needed, the specific material which may be used. Grade cuts are usually more detrimental than grade filling within the CRZ and shall be reviewed by the arborist well in advance of construction. 12. Tree Maintenance and Pruning: Trees recommended for maintenance and approved by the owner, shall be pruned for deadwood, low hanging limbs, and proper balance, as recommended for safety, clearance or aesthetics. All pruning shall be done by an International Society of Arboriculture Certified Arborist. ANSI A300 American Standards for Pruning shall be used. Limbs of retained trees within 10 feet or less, of any power line, depending on power line voltage, may only be pruned by a Utility Certified Arborist. This pruning must be coordinated with the local power company, as they may prefer to provide this pruning. 13. Underground Utilities: Utility installation within the Critical Root Zone (CRZ) of any retained tree shall be reviewed by the Project Consulting Arborist. Alternative methods of utility installation that have a lesser impact on root disturbance may be discussed and recommended. Trenching through the Interior CRZ of a retained tree is usually not allowed. See CRZ Explanation to differentiate between the Perimeter and Interior CRZ. Trenching within the CRZ may be done with an air spade and vac truck instead of mechanical excavation to minimize damage to large structural roots. Other options include tunneling under the tree with horizontal directional drilling or pneumatic boring tools. Leaving the top 3 feet of soil intact by tunneling preserves the fine absorbing roots in the upper 18 inches and usually avoids damaging large structural roots. Root depth is site and tree specific and often depends on the soil drainage qualities. One advantage to open trenching with an air spade is the ability to physically see which roots are preserved or damaged as opposed to not knowing the extent of damage underground when tunneling. Generally, tunneling is safer and less destructive. 14. Root Pruning: Required work may result in the cutting of roots of retained trees. Cutting roots 2” or greater should be avoided. Potential root pruning needs should be reviewed in advance with the Project Consulting Arborist to minimize potential root fracturing and other damage. Severed roots of retained trees shall be cut off cleanly with a sharp saw or pruning shears. Applying pruning paint on trunk or root wounds is not recommended. Severed roots shall be covered immediately after final pruning with moist soil or covered with mulch until covered with soil. Excavation equipment operators shall take extreme care not to hook roots and pull them back towards retained trees. In all cases, the excavator shall sit on ground outside of the CRZ. Soil excavation within the CRZ shall be under the direct supervision of the owner’s arborist. 15. Supplemental Tree Irrigation: If clearing is performed during the summer, supplemental watering and/or mulching over the root systems within the Tree Protection Fencing of preserved trees may be required by the owner’s arborist. The arborist should be notified of the proposed schedule for clearing and grading work. Supplemental watering and mulching over the root systems of roots impacted or General Tree Protection Guidelines By Urban Forestry Services| Bartlett Consulting 2019 Page 4 of 4 stressed trees are strongly recommended to compensate for root loss and initiate new root growth. Long periods of slow drip irrigation will be most effective. A large coil of soaker hose starting at least 18" from the trunk and covering the Interior Critical Root Zone area is recommended. Water once per week and check soils for at least 12 inches infiltration. This work shall be under the direct supervision of the owner’s arborist. 16. Additional Measures: Additional tree protection recommendations may be required and may be specified in Urban Forestry Services| Bartlett Consulting report(s). 17. Tree Protection Monitoring: The owner’s arborist may be required to monitor work when disturbance occurs near retained trees and shall make periodic site visits to report to the owner and City if tree protection guidelines are being followed. 18. Final Inspection: The owner’s arborist shall make a final site visit to report on retained tree condition following completed work and shall report to the city to release the bond, if necessary for the retained trees.