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HomeMy WebLinkAboutTR_Arborist_Report_190607_v1.pdf 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: Carson AuYeung Kiddie Research 2023 Glennwood Ave NE Renton WA 98056 REFERENCE: Arborist Report SITE: 3123 NE Sunset Blvd., Renton WA DATE: June 5, 2019 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 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 topographic survey from Core Design. I visited the site 6/3/2019 and visually inspected the trees indicated on the survey, which are the subject of this report. These represent all regulated trees on the parcel. SUMMARY Significant Trees on Site 5 Street Trees on Site 2 Total Subject Trees 7 The site is currently vacant and covered in red fescue and straw. The subject trees stand at the west and south perimeter of the parcel, with other existing landscape vegetation. Carson AuYeung, Kiddie Research RE: Arborist Report, 3123 NE Sunset Blvd., Renton WA June 5, 2019 Page 2 of 10 Greenforest Registered Consulting Arborist 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. IDENTIFICATION SCHEME Each tree was marked with a 1” x 3.5” aluminum tag indicating tree number as listed on the attached inventory, and as shown on the attached exhibit. SPECIES AND SIZE OF EACH TREE I measured the trunk diameter (54” from grade) of each tree, and identified each tree by common name. REASON(S) FOR ANY TREE REMOVAL All onsite trees are proposed for removal because of proposed site improvements. 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. 1 Companion publication to the ANSI A300 Part 9: Tree Shrub and Other woody Plant Management – Standard Practices, Tree Risk Assessment. 2011. ISA. Carson AuYeung, Kiddie Research RE: Arborist Report, 3123 NE Sunset Blvd., Renton WA June 5, 2019 Page 3 of 10 Greenforest Registered Consulting Arborist 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. Conversely, 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 inventory summarizes my inspection results and provides the following information for each tree: Proposed Action – Indicates if tree is to be removed or retained. 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. 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. (Average multiple stems and report 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. 2 Companion publication to the ANSI A300 Part 5: Tree Shrub and Other woody Plant Maintenance – Standard Practices, Managing Trees During Construction. 2008. ISA. Carson AuYeung, Kiddie Research RE: Arborist Report, 3123 NE Sunset Blvd., Renton WA June 5, 2019 Page 4 of 10 Greenforest Registered Consulting Arborist Weed: Any trees listed on the Complete King County Weed List shall not qualify as a tree.) Reason for Removal includes trees (5) conflicting with proposed improvements. Retention Priority indicates priority number based on municipal code. Tree number as shown on tag in the field, and on attached exhibit. DBH Stem diameter in inches measured 4.5 feet from the ground. Tree Species Common name. Dripline Average branch extension from the trunk as radius in feet. Health and Structure/Form ratings ‘1’ indicates good to excellent condition; no visible health-related problems or structural defects, ‘2’ indicates fair condition; minor visible problems or defects that may require attention if the tree is retained, and ‘3’ indicates poor condition; significant visible problems or defects and tree removal is recommended. Visible defects Obvious structural defects or diseases visible at time of inspection. Viability - a determination by the arborist whether the tree is viable for retention, regardless of municipal code. Type indicates if tree is Deciduous (D) or Evergreen (E). LIMITS OF DISTURBANCE Limits of Disturbance (LOD) are established below for all 5 onsite significant trees. They are listed below as radii in feet from the trunk for the 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 malleable and may be adjusted during the design and construction process. Tag No. Dia. Species Dripline LOD 8193 17.5” Norway maple 17’ 10’ 8194 8.3” Norway maple 11’ 6’ 8195 7.6” Norway maple 8’ 6' 8196 17.5” Norway maple 18’ 10’ 10501 6.5” Norway maple 7’ 6’ 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. Carson AuYeung, Kiddie Research RE: Arborist Report, 3123 NE Sunset Blvd., Renton WA June 5, 2019 Page 5 of 10 Greenforest Registered Consulting Arborist IMPACT OF NECESSARY TREE REMOVAL Removal of any or all of the five significant onsite trees will have no impact on any remaining trees, on or off site. SUPPLEMENTAL TREES No supplemental trees are required as a result of the proposed tree removal. TREE RETENTION PRIORITY CRITERIA Priority criteria is provided below from RMC §4-4-130H.1.b. and indicated for each regulated tree in the attached inventory. Priority One i. Landmark trees; ii. Significant trees that form a continuous canopy; iii. Significant trees on slopes greater than twenty percent (20%); iv. Significant trees adjacent to critical areas and their associated buffers; and v. Significant trees over sixty feet (60') in height or greater than eighteen inches (18") caliper. Priority Two i. Healthy tree groupings whose associated undergrowth can be preserved; ii. Other significant native evergreen or deciduous trees; and iii. Other significant non-native trees. Priority Three Alders and cottonwoods shall be retained when all other trees have been evaluated for retention and are not able to be retained, unless the alders and/or cottonwoods are used as part of an approved enhancement project within a critical area or its buffer. TREE RETENTION AND LAND CLEARING REGULATIONS The following pertains to the protection and preservation of 2 retained trees: 4.4.130 §H.9. Protection Measures During Construction: Protection measures in this subsection shall apply for all trees that are to be retained. All of the following tree protection measures shall apply: a. Construction Storage Prohibited: The applicant may not fill, excavate, stack or store any equipment, dispose of any materials, supplies or fluids, operate any equipment, install impervious surfaces, or compact the earth in any way within the area defined by the drip line of any tree to be retained. b. Fenced Protection Area Required: Prior to development activities, the applicant shall erect and maintain six-foot (6') high chain link temporary construction fencing around the drip lines of all retained trees or at a distance surrounding Carson AuYeung, Kiddie Research RE: Arborist Report, 3123 NE Sunset Blvd., Renton WA June 5, 2019 Page 6 of 10 Greenforest Registered Consulting Arborist the tree equal to one and one-quarter feet (1.25') for every one inch (1") of trunk caliper, whichever is greater, or along the perimeter of a tree protection tract. Placards shall be placed on fencing every fifty feet (50') indicating the words, “NO TRESPASSING – Protected Trees,” or on each side of the fencing if less than fifty feet (50'). Site access to individually protected trees or groups of trees shall be fenced and signed. Individual trees shall be fenced on four (4) sides. In addition, the applicant shall provide supervision whenever equipment or trucks are moving near trees. c. Protection from Grade Changes: If the grade level adjoining to a tree to be retained is to be raised, the applicant shall construct a dry rock wall or rock well around the tree. The diameter of this wall or well must be equal to the tree’s drip line. d. Impervious Surfaces Prohibited within the Drip Line: The applicant may not install impervious surface material within the area defined by the drip line of any tree to be retained. e. Restrictions on Grading within the Drip Lines of Retained Trees: The grade level around any tree to be retained may not be lowered within the greater of the following areas: (i) the area defined by the drip line of the tree, or (ii) an area around the tree equal to one and one-half feet (1-1/2') in diameter for each one inch (1") of tree caliper. A larger tree protection zone based on tree size, species, soil, or other conditions may be required. (Ord. 5676, 12-3-2012) f. Mulch Layer Required: All areas within the required fencing shall be covered completely and evenly with a minimum of three inches (3") of bark mulch prior to installation of the protective fencing. Exceptions may be approved if the mulch will adversely affect protected ground cover plants. (Ord. 5676, 12-3- 2012) g. Monitoring Required during Construction: The applicant shall retain a certified arborist or licensed landscape architect to ensure trees are protected from development activities and/or to prune branches and roots, fertilize, and water as appropriate for any trees and ground cover that are to be retained. h. Alternative Protection: Alternative safeguards may be used if determined to provide equal or greater tree protection. (Ord. 5676, 12-3-2012) Attachments: 1. Assumptions and Limiting Conditions 2. Certification of Performance 3. Significant Tree Inventory 4. Tree Retention Plan 5. Planting and Maintenance Specifications Carson AuYeung, Kiddie Research RE: Arborist Report, 3123 NE Sunset Blvd., Renton WA June 5, 2019 Page 7 of 10 Greenforest Registered Consulting Arborist Attachment No. 1 - Assumptions & Limiting Conditions 1. A field examination of the site was made 6/3/2019. 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. Carson AuYeung, Kiddie Research RE: Arborist Report, 3123 NE Sunset Blvd., Renton WA June 5, 2019 Page 8 of 10 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: June 5, 2019 Carson AuYeung, Kiddie Research RE: Arborist Report, 3123 NE Sunset Blvd., Renton WA June 5, 2019 Page 9 of 10 Greenforest Registered Consulting Arborist Attachment No. 3 – Tree Inventory Proposed Action Category Reason for Removal Retention Priority Tag No. DBH Species Dripline Radius Health Structure/ Form Comments on Condition Viable Tree Tree Type REMOVE Significant Proposed Improvements 2.i & iii 8193 17.5” Norway maple 17’ 1 1 Yes D REMOVE Significant 2.i & iii 8194 8.3” Norway maple 11’ 1 1 Yes D REMOVE Significant 2.i & iii 8195 7.6” Norway maple 8’ 1 1 Yes D Retain Significant 2.i & iii 8196 17.5” Norway maple 18’ 1 1 Yes D REMOVE Significant Pro. Imp. 2.i & iii 10501 6.5” Norway maple 7’ 1 1 Yes D STREET TREES Retain Street Tree 8197 17.5” Sycamore 22’ 1 1 Yes D Retain Street Tree 10500 6” Norway maple 4’ 1 2 Trunk injury Yes D NE SUNSET BLVDNE 12TH STREETNE SUNSET BLVDNE 12TH STREETIN COMPLIANCE WITH CITY OF RENTON STANDARDSDESIGN12100 NE 195th St, Suite 300 Bothell, Washington 98011 425.885.7877CIVIL ENGINEERINGLANDSCAPE ARCHITECTUREPLANNINGSURVEYINGKIDDIE RESEARCH DAYCARE CENTERPRELIMINARY TREE RETENTION PLANP06PRELIMINARY TREE RETENTION PLANSCALE: 1" = 20'EXISTING TREE INVENTORYNOTES1. "ESTIMATED OFFSITE TREES" ARE FOR REFERENCE ONLY FOR THEPROTECTION OF EACH TREE. SEE THE CLEARING AND GRADING PLANFOR MORE INFORMATION AND TREE PROTECTION FENCINGLOCATIONS.SUMMARY OF ON-SITE TREE RETENTIONSIGNIFICANT TREES REQUIRED FOR RETENTION:(10%, PER PREAPPLICATION MEETING NOTES)SIGNIFICANT TREES TO BE RETAINED:REPLACEMENT TREE INCHES REQUIRED(12 INCHES REQUIRED FOR EACH PROTECTED TREE)REPLACEMENT TREE INCHES PROVIDED:TOTAL EXISTING SIGNIFICANT TREES:EXISTING TREES REQUIRED FOR RETENTION:(10%, PER PREAPPLICATION MEETING NOTES)SIGNIFICANT TREES TO BE RETAINED:SIGNIFICANT TREES TO BE REMOVED:51 (5 X 10% = 0.5)14REPLACEMENT TREE CALCULATIONS1100SIGNIFICANT TREE TO BE RETAINEDSIGNIFICANT TREE TO BE REMOVEDLEGENDOFFSITE TREESIGNIFICANT TREE TO BE RETAINED (TYP.)R.O.W PROPERTY LINE (TYP.)UTILITY EASEMENT (TYP.)R.O.W. DEDICATION (TYP.)SIGNIFICANT TREE TO BE REMOVED (TYP.)