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HomeMy WebLinkAboutTR_Arborist_Report_180315_v1 Greenforest Incorporated C o n s u l t i n g A r b o r i s t 4547 South Lucile Street, Seattle, WA 98118 Tel. 206-723-0656 TO: Lakhvir Sandhu 9329 S 200th Street Kent WA 98031 REFERENCE: Arborist Report SITE ADDRESS: 18809 116th Ave SE, Renton WA DATE: September 11, 2017 PREPARED BY: Favero Greenforest, ISA Certified Arborist # PN -0143A ISA Tree Risk Assessment Qualified ASCA Registered Consulting Arborist® #379 INTRODUCTION You contacted me and contracted my services as a consulting arborist. My assignment is to inspect and assess the regulated trees at the above referenced site. The purpose of this report is to establish the condition of the significant trees to satisfy City of Renton permit submittal requirements. I received a site plan from you showing the locations and numbers of the surveyed trees. I visited the site 8/30/2017 and visually inspected the trees indicated on the survey, which are the subject of this report. I added two trees not included in the survey. This report establishes the condition of, and represents all regulated trees on the parcel. The attached table summarizes the tree quantities and categories inventoried in this report. Significant, Landmark and Dangerous categories are defined by municipal code. Summary Significant Trees on Site 37 Landmark Trees on Site 0 Dangerous Trees on Site 14 Lakhvir Sandhu RE: Arborist Report, 18809 116th Ave SE, Renton WA September 11, 2017 Page 2 of 12 Greenforest Registered Consulting Arborist The site is undeveloped and mostly covered in mowed weeds and grasses. Most of the significant trees are a naturalized stand of Black locust at the NE corner of the site. These locust trees have not been maintained, and if retained, should be only in a grove: not as stand-alone. The two largest trees (in the center of the parcel) are damaged beyond repair by a recent fire. LIMITATIONS AND USE OF THIS REPORT This tree report establishes, via the most practical means available, the existing conditions of the trees on the subject property. Ratings for health and structure, as well as any recommendations are valid only through the development and construction process. This report is based solely on what is readily visible and observable, without any invasive means. There are several conditions that can affect a tree’s condition that may be pre-existing and unable to be ascertained with a visual-only analysis. No attempt was made to determine the presence of hidden or concealed conditions which may contribute to the risk or failure potential of trees on the site. These conditions include root and stem (trunk) rot, internal cracks, structural defects or construction damage to roots, which may be hidden beneath the soil. Additionally, construction and post-construction circumstances can cause a relatively rapid deterioration of a tree’s condition. SPECIES AND SIZE OF EACH TREE I measured the trunk diameter (54” from grade) of each tree, and identified each tree by common name. All regulated trees on the site are significant: there are no landmark trees. Several trees included on the survey are smaller than the 8” DBH threshold, and are included in the attached inventory and tree number exhibit. Each regulated tree is marked in the field with survey tape tied to the trunk. REASON(S) FOR ANY TREE REMOVAL I rated the health and structure of each tree. Trees with significant visible problems or defects are indicated as Dangerous (See Tree Category definitions below). These trees are not viable for retention. Reasons supporting their recommended removal are provided in the attached tree inventory. Lakhvir Sandhu RE: Arborist Report, 18809 116th Ave SE, Renton WA September 11, 2017 Page 3 of 12 Greenforest Registered Consulting Arborist TREE INSPECTION METHOD – TREE HEALTH, CONDITION AND VIABILITY I visually inspected each tree from the ground. I performed a Level 1 risk assessment.1 This is the standard assessment for populations of trees near specified targets, conducted in order to identify obvious defects or specified conditions such as a pre-development inventory. This is a limited visual assessment focuses on identifying trees with imminent and/or probable likelihood of failure, and/or other visible conditions that will affect tree retention. I recorded tree species and size (DBH). I estimated the average dripline of each tree. I rated the condition of each tree, both health and structure. A tree’s structure is distinct from its health. This inspection identifies what is visible with both. High-risk trees can appear healthy in that they can have a dense, green canopy. This may occur when there is sufficient sapwood or adventitious roots present to maintain tree health, but inadequate strength for structural support. On the other hand, trees in poor health may or may not be structurally stable. For example, tree decline due to root disease is likely to cause the tree to be structurally unstable, while decline due to drought or insect attack may not. One way that tree health and structure are linked is that healthy trees are more capable of compensating for structural defects. A healthy tree can develop adaptive growth that adds strength to parts weakened by decay, cracks, and wounds. This report identifies unhealthy trees based on existing health conditions and tree structure, and specifies which trees are most suitable for preservation.2 No invasive procedures were performed on any trees. The results of this inspection are based on what was visible at the time of the inspection. The attached tree inventory contains the following information on each tree. Tree Category as defined by municipal code. (TREE: A woody perennial usually having one dominant trunk, or, for certain species, a multi-stemmed trunk system, with a potential minimum height of ten feet (10') at maturity. Any trees listed on the Complete King County Weed List shall not qualify as a tree.) 1 Companion publication to the ANSI A300 Part 9: Tree Shrub and Other woody Plant Management – Standard Practices, Tree Risk Assessment. 2011. ISA. 2 Companion publication to the ANSI A300 Part 5: Tree Shrub and Other woody Plant Maintenance – Standard Practices, Managing Trees During Construction. 2008. ISA. Lakhvir Sandhu RE: Arborist Report, 18809 116th Ave SE, Renton WA September 11, 2017 Page 4 of 12 Greenforest Registered Consulting Arborist Dangerous: Any tree that has been certified, in a written report, as dead, terminally diseased, damaged, or otherwise dangerous to persons or property by a licensed landscape architect, or certified arborist. Landmark: A tree with a caliper of thirty inches (30") or greater. (Multiple- stemmed trees are reported as the average using a single integer.) Significant: A tree with a caliper of at least six inches (6"), or an alder or cottonwood tree with a caliper of at least eight inches (8"). Trees qualified as dangerous shall not be considered significant. Trees planted within the most recent ten (10) years shall qualify as significant trees, regardless of the actual caliper. Tree number as shown on the attached site exhibit. DBH Stem (trunk) diameter in inches 4.5 feet from grade. Tree Species Common name. Dripline Average branch extension in feet as radius from the trunk. Health & Structure Rating ‘1’ indicates no visible health-related problems or structural defects; ‘2’ indicates minor visible problems or defects that may require attention or maintenance if the tree is retained, and/or the tree should only remain as a grove tree, and not stand alone; and ‘3’ indicates significant visible problems or defects (the tree qualifies as dangerous) and tree removal is recommended. Visible Defects Obvious structural defects or diseases visible at time of inspection, including: Asymmetric canopy– the tree has an asymmetric canopy from space and light competition from adjacent trees. Chlorosis – yellowing or off-color foliage. Decay – process of wood degradation by microorganisms resulting in weak and defective structure. Diseased – foliage and trunk/stems are diseased. Dogleg in trunk – trunk with a bow or defective bend (90°) in trunk often half way of further up the trunk. Double leader – the tree has multiple stem attachments, which may require maintenance or monitoring over time. Insect Injury – needle loss caused by aphids. Lean – angle of the trunk from vertical. Previous failure – tree trunk previously broken and defective. Slender – tree lacks adequate trunk taper to stand lone. Lakhvir Sandhu RE: Arborist Report, 18809 116th Ave SE, Renton WA September 11, 2017 Page 5 of 12 Greenforest Registered Consulting Arborist Stumpsprout- tree previously cut at grade with multiple stems and potentially weak attachments. Sweep – tree leans away from adjacent trees. Characterized by a leaning lower trunk and a top that is more upright. Topped – the tree is previously topped and has poor structure and/or stem decay. Trunk decay - wood decay is visible in the trunk. Wound/decay base of trunk - open wound with visible decay in trunk. Type indicates if tree is Deciduous (D) or Evergreen (E). Viability - a determination by the arborist whether the tree is viable for retention. LOD – Limits of disturbance as radius in feet. LIMITS OF DISTURBANCE Limits of Disturbance (LOD) are calculated for all the significant trees. They are listed in the attached inventory as radii in feet from the trunk for one side of the tree to be impacted by construction. They are determined using rootplate 3 and trunk diameter,4,5 and ISA Best Management Practices.6 These are the minimum distances from the trees for any soil disturbance, and represent the area to be protected during construction. These LOD are provided as a reference for site layout, they are malleable and may be adjusted during the design and construction process. Attachments: 1. Assumptions and Limiting Conditions 2. Certification of Performance 3. Tree Inventory 4. Tree No. Exhibit 3 Coder, Kim D. 2005. Tree Biomechanics Series. University of Georgia School of Forest Resources. 4 Smiley, E. Thomas, Ph. D. Assessing the Failure Potential of Tree Roots, Shade Tree Technical Report. Bartlett Tree Research Laboratories. 5 Fite, Kelby and E. Thomas Smiley. 2009. Managing Trees During construction; Part Two. Arborist News. ISA. 6 Companion publication to the ANSI A300 Series, Part 5: Managing Trees During Construction. 2008. ISA. Lakhvir Sandhu RE: Arborist Report, 18809 116th Ave SE, Renton WA September 11, 2017 Page 6 of 12 Greenforest Registered Consulting Arborist Attachment No. 1 - Assumptions & Limiting Conditions 1. A field examination of the site was made 8/30/2017. My observations and conclusions are as of that date. 2. Care has been taken to obtain all information from reliable sources. All data has been verified insofar as possible; however, the consultant/arborist can neither guarantee nor be responsible for the accuracy of information provided by others. 3. I am not a qualified land surveyor. Reasonable care was used to match the trees indicated on the sheets with those growing in the field. 4. Construction activities can significantly affect the condition of retained trees. All retained trees should be inspected after construction is completed, and then inspected regularly as part of routine maintenance. 5. Unless stated other wise: 1) information contained in this report covers only those trees that were examined and reflects the condition of those trees at the time of inspection; and 2) the inspection is limited to visual examination of the subject trees without dissection, excavation, probing, or coring. There is no warranty or guarantee, expressed or implied that problems or deficiencies of the subject tree may not arise in the future. 6. All trees possess the risk of failure. Trees can fail at any time, with or without obvious defects, and with or without applied stress. A complete evaluation of the potential for this (a) tree to fail requires excavation and examination of the base of the subject tree. Permission of the current property owner must be obtained before this work can be undertaken and the hazard evaluation completed. 7. The consultant/appraiser shall not be required to give testimony or to attend court by reason of this report unless subsequent contractual arrangements are made. Lakhvir Sandhu RE: Arborist Report, 18809 116th Ave SE, Renton WA September 11, 2017 Page 7 of 12 Greenforest Registered Consulting Arborist Attachment No. 2 - Certification of Performance I, Favero Greenforest, certify that: • I have personally inspected the trees and the property referred to in this report and have stated my findings accurately. • I have no current or prospective interest in the vegetation or the property that is the subject of this report and have no personal interest or bias with respect to the parties involved. • The analysis, opinion, and conclusions stated herein are my own and are based on current scientific procedures and facts. • My analysis, opinion, and conclusions were developed and this report has been prepared according to commonly accepted arboricultural practices. • No one provided significant professional assistance to me, except as indicated within the report. • My compensation is not contingent upon the reporting of a predetermined conclusion that favors the cause of the client of any other party nor upon the results of the assessment, the attainment of stipulated results, or the occurrence of any subsequent events. I further certify that I am a member in good standing of International Society of Arboriculture (ISA), and the ISA PNW Chapter, I am an ISA Certified Arborist (#PN-0143A) and am Tree Risk Assessment Qualified, and am a Registered Consulting Arborist® (#379) with American Society of Consulting Arborists. I have worked as an independent consulting arborist since 1989. Signed: GREENFOREST, Inc. By Favero Greenforest, M. S. Date: September 11, 2017 Lakhvir Sandhu RE: Arborist Report, 18809 116th Ave SE, Renton WA September 11, 2017 Page 8 of 12 Greenforest Registered Consulting Arborist Attachment No. 3 – Significant Tree Inventory Category Tree No. DBH Species Dripline Health Structure Visible Defects Tree Type Viable Tree Limit of Disturbance Significant 701 15” Douglas-fir 14’ 1 1 E YES 8’ Significant 702 6,6,8” Hawthorne 10’ 2 2 Diseased, ivy D YES 6’ Significant 704 20,20” Black locust 18’ 1 2 Asymmetric canopy D YES 12’ Significant 705 23” Black locust 16’ 1 1 D YES 10’ Significant 706 25” Black locust 16’ 1 1 D YES 10’ Significant 707 8” Black locust 12’ 1 2 Lean D YES 6’ Significant 708 8,9” Black locust 14’ 1 2 Asymmetric D YES 6’ Significant 709 7” Black locust 10’ 1 2 Slender, trunk wound D YES 4’ Significant 710 8,8,8” Black locust 14’ 1 2 Stumpsprout D YES 8’ Significant 711 7” Black locust 10’ 1 2 Slender D YES 6’ Significant 712 7” Black locust 10’ 1 2 Slender D YES 6’ Significant 713 8” Black locust 14’ 1 2 Stumpsprout D YES 6’ Significant 714 6” Black locust 10’ 1 2 Slender D YES 6’ Significant 716 6” Black locust 12’ 1 2 Slender D YES 6’ Significant 719 6” Black locust 8’ 1 2 Slender D YES 6’ Significant 720 7,7” Black locust 10’ 1 2 Asymmetric D YES 6’ Significant 721 7” Black locust 10’ 1 2 Slender D YES 6’ Significant 730 9” Black locust 13’ 1 2 Asymmetric D YES 6’ Significant 733 9” Black locust 8’ 1 2 Asymmetric D YES 6’ Lakhvir Sandhu RE: Arborist Report, 18809 116th Ave SE, Renton WA September 11, 2017 Page 9 of 12 Greenforest Registered Consulting Arborist Category Tree No. DBH Species Dripline Health Structure Visible Defects Tree Type Viable Tree Limit of Disturbance Significant 734 7” Black locust 12’ 1 2 Asymmetric D YES 6’ Significant 736 6,6,6,8,8” Black locust 16’ 1 2 Stumpsprout D YES 8’ Significant 737 8” Black locust 10’ 1 1 D YES 6’ Significant 739 10,10” Black locust 14’ 1 2 Asymmetric D YES 8’ Significant 746 10” Black locust 12’ 1 2 Lean D YES 6’ Significant 752 8” Black cottonwood 12’ 1 2 Trunk injury D YES 6’ Significant 753 9” Douglas-fir 8’ 2 1 Chlorotic foliage E YES 6’ Significant 758 7” Blue spruce 7’ 2 1 Insect injury (spruce needle aphid) E YES 6’ Significant 759 6” Blue spruce 7’ 2 2 Insect injury, asymmetric E YES 6’ Significant 761 6” Black locust 12’ 1 2 Stumpsprout D YES 6’ Significant 764 6” Black locust 13’ 1 2 Asymmetric D YES 6’ Significant 765 5” Black locust 14’ 1 2 Asymmetric D YES 6’ Significant 766 6,7” Black locust 12’ 1 2 Asymmetric D YES 6’ Significant 767 6” Black locust 10’ 1 2 Slender D YES 6’ Significant 769 9” Black locust 12’ 1 2 Slender D YES 6’ Dangerous 771 38” Douglas-fir 18’ 3 1 Fire injury E NO Significant 772 8” Pacific dogwood 12’ 1 2 Asymmetric D YES 6’ Significant A 7” Black locust 12’ 1 2 Slender D YES 6’ Significant B 8” Black locust 12’ 1 2 Asymmetric D YES 6’ Dangerous 722 6” Black locust 14’ 1 3 Lean D NO Dangerous 729 8,8,9” Black locust 14’ 1 3 Lean, stumpsprout D NO Dangerous 732 7” Black locust 10’ 1 3 Lean D NO Lakhvir Sandhu RE: Arborist Report, 18809 116th Ave SE, Renton WA September 11, 2017 Page 10 of 12 Greenforest Registered Consulting Arborist Category Tree No. DBH Species Dripline Health Structure Visible Defects Tree Type Viable Tree Limit of Disturbance Dangerous 738 5” Black locust 8’ 1 3 Topped D NO Dangerous 742 6,7,7” Black locust 16’ 1 3 Stumpsprout, lean D NO Dangerous 744 7” Black locust 14’ 1 3 Lean D NO Dangerous 745 7” Black locust 14’ 1 3 Lean D NO Dangerous 748 6” Bitter cherry 8’ 3 3 Decline, decay, lean, sweep, ugly D NO Dangerous 751 8” Douglas-fir 12’ 2 3 Chlorotic, trunk injury E NO Dangerous 768 8” Black locust 10’ 1 3 Trunk injury, dogleg D NO Dangerous 770 22,24” Western red-cedar 18’ 3 3 Fire injury, double leader E NO Dangerous 773 8” Lombardi poplar 1’ 3 3 Diseased, decline, decay D NO Dangerous 777 9” Black locust 14’ 1 3 Previous failure D NO 37 SIGNIFICANT TREES 14 DANGEROUS TREES TOO SMALL & DUPLICATE TREES Too small 703 Too small 715 Too small 717 Too small 718 Too small 723 Too small 724 Too small 725 Too small 726 Duplicate 727 Duplicate of 729 Lakhvir Sandhu RE: Arborist Report, 18809 116th Ave SE, Renton WA September 11, 2017 Page 11 of 12 Greenforest Registered Consulting Arborist Category Tree No. DBH Species Dripline Health Structure Visible Defects Tree Type Viable Tree Limit of Disturbance Duplicate 728 Duplicate of 729 Too small 731 Too small 735 Too small 740 Too small 741 Too small 743 Too small 747 749 No tree this location Too small 750 Too small 754 Too small 755 Too small 756 Too small 757 Too small 760 Too small 762 Too small 763 Too small 774 Too small 775 Too small 776 SANDHU SANDHU18809 116th Ave SE, Renton WA 98058