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BLD2024-0134+ARBORIST REPORT+2.6.2024_10.12.48_AM+4042060CASCARA TREE CONSULTING ARBORIST REPORT RECEIVED Feb 07 2024 BLD2024-0134 CITY OF EDMONDS DEVELOPMENT SERVICES DEPARTMENT TO: Select Homes Inc. REFERENCE: Tree Inventory & Arborist Report SITE ADDRESS: 10429 240t" PI SW, Edmonds, WA (Parcel #: 00564900100500) DATE: 2/4/2024 PREPARED BY: Katie Hogan, ISA Certified Arborist PN-8078A ISA Tree Risk Assessment Qualified Summary This report documents the December 15, 2023, tree inventory and assessment at the above -addressed site. This assessment was requested in preparation for the submittal of single-family building permits to the City of Edmonds and to meet the requirements of the Edmonds Community Development Code (ECDC) 23.10.060. There are three significant' trees located on the subject property and five trees adjacent to the site with overhanging canopies. Of the three trees on the site, one of them is a healthy viable tree and two are non -viable due to declining health and structural condition. Per ECDC 23.10.060, 30-percent of total viable significant trees are required for retention. There is only one viable tree on the subject property and this tree is proposed for retention for a total retention of 100-percent. Four replacement trees are required to satisfy the requirements of ECDC 23.10.080. For this 11,455 square foot lot, three trees are required for every 8,000 square feet, resulting in a total of 5 required trees (rounded up from 4.29). One tree is proposed for retention therefore four total replacement trees are required. ' Significant tree: trees 6" Diameter at Breast Height (DBH) or greater per ECDC 23.10.020. 1IPage Arborist Report: 10429 2401h PI SW SFR (Select Homes Inc.) Observations & Discussion Site Cnnditinns The subject site is an approximately 0.26-acre property located along 240th PI SE in the City of Edmonds. The site currently has a single-family residence that is slated for demolition and the construction of one new single- family residence is proposed. Existing Trees, Proposed Impacts & Tree Replacement Three significant trees exist on the site; only one of which is a viable healthy tree. Tree #170 is a Pacific dogwood (Cornus nuttallii) tree located at the front of the house which was damaged in the recent house fire. Tree #172 is a western redcedar (Thuja plicata) located in the northeast corner of the site that is nearly dead with substantial visible trunk decay. Both trees are slated for removal due to their declining conditions. Tree #171 is a grand fir (Abies grandis) located in the rear yard that was in good health and structural condition. Tree #171 is proposed for retention and protection during site redevelopment. Table 1. Summary Tree Viability Table Summary Tree Table Total Significant Trees 3 Total Viable Significant Trees 1 Total Not Viable Significant Trees 2 Table 2. Summary Tree Retention Table Summary Tree Table Total Viable Significant Trees 1 Total Viable Trees Retained 1 Total Tree Retention Percentage 100% Adiacent Trees There are five trees located adjacent to the subject site on neighboring properties with overhanging canopies. These trees are noted alphabetically as Trees A through E and are all slated for retention and protection. Impacts to off -site trees A, B, D and E will be minimal. Trees A and B will be protected at the edge of the existing driveway which will be retained throughout redevelopment. Trees D and E will be protected at their driplines, and site improvements within the surrounding area will consist mainly of re -landscaping. Tree C is a 25-inch Diameter at Breast Height (DBH) Douglas -fir (Pseudotsuga menziesii) tree located at the southeast corner of the property. This tree is located approximately 8 to 12 feet from proposed site improvements, including new utility lines and a driveway. Proposed work encroaches approximately 8-feet 2 1 P a g e Arborist Report: 10429 2401h PI SW SFR (Select Homes Inc.) within the western portion of the tree canopy. To ensure minimal damage to roots, the project arborist shall be consulted and supervise all work within the critical root zone/canopy of offsite Tree C. Tree Replacement This project is required to retain at least 30-percent of the total viable trees per ECDC 23.10.060. One viable tree exists on site that is planned for retention, therefore total tree retention for this project is 100-percent. ECDC 23.10.080 requires that all properties undergoing redevelopment plant or retain three trees per every 8,000 square feet. For this 11,455 square foot property, five total trees are required (rounded up from 4.29). Because only one viable tree exists on -site and is proposed for retention, four replacement trees are required to be planted. The project proposes replanting four new trees to satisfy this requirement. The proposed trees include two Prunus serrulata and two Magnolia stellata. Replacement trees shall be a minimum size of 1.5- inches caliper. Recommendations/Specifications Tree C • Project arborist shall monitor all excavation within critical area/dripline to ensure roots are properly managed if encountered. Excerpt from City of Edmonds Tree Protection Requirements (ECDC 23.10.070) Prior to development activity or initiating tree removal on the site, vegetated areas, individual trees and soil to be preserved in accordance with ECDC 23.10.060(B) shall be protected from potentially damaging activities pursuant to the following standards: A. Preconstruction Meeting Required. Prior to the commencement of any permitted clearing and grading activity, a preconstruction meeting shall be held on site with the permittee and appropriate city staff. The project site shall be marked in the field as follows: 1. The extent of clearing and grading to occur; 2. Delineation and protection of any critical areas and critical area buffers with clearing limit fencing; 3. Flagging of trees to be removed and tags on trees to be retained; and 4. Property lines. B. Placing Materials Near Trees. No person may conduct any activity within the protected area of any tree designated to remain, including, but not limited to, operating or parking equipment, placing solvents, storing building material or stockpiling any materials, or dumping concrete washout or other chemicals. During construction, no person shall attach any object to any tree designated for protection. C. Protective Barrier. Before development, land clearing, grading, filling or any land alteration, the applicant shall: 1. Erect and maintain readily visible temporary protective tree fencing along the limits of disturbance which completely surrounds the protected area of all retained trees, groups of trees, vegetation and native soil. Tree protective fencing shall be a minimum height of three feet, visible and of durable construction; orange polyethylene laminar fencing is acceptable. 2. Install highly visible signs spaced no further than 15 feet apart along the entirety of the protective tree fencing. Said sign must be approved by the director and shall state, at a minimum, "Tree and Soil Protection Area, Entrance Prohibited," and provide the city phone number for code enforcement to report violations. 3 1 P a g e Arborist Report: 10429 2401h PI SW SFR (Select Homes Inc.) 3. Prohibit excavation or compaction of soil or other potentially damaging activities within the barriers; provided, that the director may allow such activities approved by a qualified professional and under the supervision of a qualified professional retained and paid for by the applicant. 4. Maintain the protective barriers in place for the duration of the project until the director authorizes their removal. 5. Ensure that any approved landscaping done in the protected zone subsequent to the removal of the barriers shall be accomplished with machinery from outside the protected zone or by hand. 6. Limit the time period that the critical root zone is covered by mulch, plywood, steel plates or similar materials, or by light soils, to protect the tree's critical root zone. 7. In addition to the above, the director may require the following: a. If equipment is authorized to operate within the protected zone, the soil and critical root zone of a tree must be covered with mulch to a depth of at least six inches or with plywood, steel plates or similar material in order to protect roots and soil from damage caused by heavy equipment. b. Minimize root damage by hand -excavating a two -foot -deep trench, at edge of critical root zone, to cleanly sever the roots of trees to be retained. Never rip or shred roots with heavy equipment. c. Corrective pruning performed on protected trees in order to avoid damage from machinery or building activity. d. Maintenance of trees throughout construction period by watering and fertilizing. D. Grade. 1. The grade shall not be elevated or reduced within the critical root zone of trees to be preserved without the director's authorization based on recommendations from a qualified professional. The director may allow coverage of up to one-half of the area of the tree's critical root zone with light soils (no clay) to the minimum depth necessary to carry out grading or landscaping plans, if it will not imperil the survival of the tree. Aeration devices may be required to ensure the tree's survival. 2. If the grade adjacent to a preserved tree is raised such that it could slough or erode into the tree's critical root zone, it shall be permanently stabilized to prevent soil erosion and suffocation of the roots. 3. The applicant shall not install an impervious surface within the critical root zone of any tree to be retained without the authorization of the director. The director may require specific construction methods and/or use of aeration devices to ensure the tree's survival and to minimize the potential for root -induced damage to the impervious surface. 4. To the greatest extent practical, utility trenches shall be located outside of the critical root zone of trees to be retained. The director may require that utilities be tunneled under the roots of trees to be retained if the director determines that trenching would significantly reduce the chances of the tree's survival. 5. Trees and other vegetation to be retained shall be protected from erosion and sedimentation. Clearing operations shall be conducted so as to expose the smallest practical area of soil to erosion for the least possible time. To control erosion, it is encouraged that shrubs, ground cover and stumps be maintained on the individual lots, where feasible. 6. The director may approve the use of alternative tree protection techniques if those techniques provide an equal or greater degree of protection than the techniques listed in this subsection. 4 1 P a g e Arborist Report: 10429 2401h PI SW SFR (Select Homes Inc.) Attachments 1) Site Map 2) Photographs 3) Glossary 4) References 5) Inspection Methods 6) Appendix A — Assumptions & Limiting Conditions 7) Appendix B — Certification of Performance 8) Tree Inventory Table 5 1 P a g e Arborist Report: 10429 24011, PI SW SFR (Select Homes Inc.) SITE MAP Map Title i�i Snohomish County Assessor -• hl,- - ------------ --- - - - - -, L-------------- ---- - �, Legend ¢ Parcel Recent Sales 202LI Recent Sales 2023 -►, �� q•;.b �.: Recent Sales 2022 City Boundary L I County Park F 1' r National Forest N.: 1j •� r s ` Water SI Street Types Interstate 40 State Route s- Local Road ' t z 0 56 113 Feel 2A4 2024 Figure 1. Subject site. 6 1 P a g e 4ti 5• .. Av - \ 151 _ Y Arborist Report: 10429 2401h PI SW SFR (Select Homes Inc.) G LOSSARY ANSI A300: American National Standards Institute (ANSI) standards for tree care Chlorotic: discoloration caused by lack of chlorophyll in the foliage Codominant Stems: two or more stems (or leaders) of relatively similar size that emerge from the same location on the main trunk (Gilman, 2002) Conifer: a tree that bears cones and has evergreen needles or scales Crown: the above ground portion of the tree comprised of branches and their foliage Crown raise pruning: a pruning technique where the lower branches are removed, thus raising the overall height of the crown from the ground DBH or DSH: diameter at breast or standard height; the diameter of the trunk measured 54 inches (4.5 feet) above grade Deciduous: tree or other plant that loses its leaves annually and remains leafless generally during the cold season Epicormic: arising from latent or adventitious buds Evergreen: tree or plant that keeps its needles or leaves year-round; this means for more than one growing season Increment: the amount of new wood fiber added to a tree in a given period, normally one year. ISA: International Society of Arboriculture Landscape function: the environmental, aesthetic, or architectural functions that a plant can have Lateral: secondary or subordinate branch Limits of disturbance: The boundary of minimum protection around a tree, the area that cannot be encroached upon without possible permanent damage to the tree. It is a distance determined by a qualified professional and is based on the age of the tree, its health, the tree species tolerance to disruption and the type of disturbance. It also considers soil and environmental condition and previous impacts. It is unique to each tree in its location. Limited visual assessment: a visual assessment from a specified perspective such as foot, vehicle, or aerial (airborne) patrol of an individual tree or a population of trees near specified targets to identify specified conditions or obvious defects (ISA 2013) Live crown ratio: the percentage of living tissue in the canopy versus the tree's height. It is a good indicator of overall tree health and the trees growing conditions. Trees with less than a 30% crown ratio often lack the necessary quantity of photosynthetic material to sustain the roots; consequently, the tree may exhibit low vigor and poor health Monitoring: keeping a close watch; performing regular checks or inspections Owner/manager: the person or entity responsible for tree management or the controlling authority that regulates tree management Pathogen: causal agent of disease Phototropic growth: growth toward light source or stimulant ROW: right-of-way; generally referring to a tree that is located offsite on a city easement Reaction wood: specialized secondary xylem which develops in response to a lean or similar mechanical stress, it serves to help restore the stem to a vertical position Self -corrected lean: a tree whose trunk is at an angle to the grade but whose trunk and canopy changes to become upright/vertical Significant tree: a tree measuring a specific diameter determined by the municipality the tree grows in. Some municipalities deem that only healthy trees can be significant, other municipalities consider both healthy and unhealthy trees of a determined diameter to be significant Snag: a tree left partially standing for the primary purpose of providing habitat for wildlife Soil structure: the size of particles and their arrangement; considers the soil, water, and air space 91 Arborist Report: 10429 2401h PI SW SFR (Select Homes Inc.) Sounding: process of striking a tree with a mallet or other appropriate tool and listening for tones that indicate dead bark, a thin layer of wood outside a cavity, or cracks in wood Structural defects: flaws, decay, or other faults in the trunk, branches, or root collar of a tree, which may lead to failure; may be genetic, or environmental Tree credit: a number assigned to a tree by a municipality that may be equal to the diameter of the tree or a numerical count of the tree, or related to diameter by a factor conveyed in a table of the municipal code Trunk area: the cross -sectional area of the trunk based upon measurement at 54 inches (4.5 ft.) above grade Visual Tree Assessment (VTA): method of evaluating structural defects and stability in trees by noting the pattern of growth. Developed by Claus Mattheck (Harris, et al 1999) detailed visual inspection of a tree and surrounding site that may include the use of simple tools. It requires that a tree risk assessor walk completely around the tree trunk looking at the site, aboveground roots, trunk, and branches (ISA 2013) 101 Page Arborist Report: 10429 2401h PI SW SFR (Select Homes Inc.) REFERENCES Dirr, Michael A. Manual of Woody Landscape Plants, Their Identification, Ornamental Characteristics, Culture, Propagation, and Uses. Champaign: Stipes Publishing Company, 1990. Dunster & Associates Environmental Consultants Ltd. Assessing Trees in Urban Areas and the Urban -Rural Interface. US Release 1.0. Silverton: Pacific Northwest Chapter ISA, 2006. Dunster, J. A. 2003. Preliminary Species Profiles for Tree Failure Assessment. Bowen Island: Dunster & Associates Environmental Consultants Ltd. Dunster, Julian A., E. Thomas Smiley, Nelda Matheny and Sharon Lilly. Tree Risk Assessment Manual. Champaign, Illinois: International Society of Arboriculture, 2013. Harris, Richard W, James Clark, and Nelda Matheny. Arboriculture, Integrated Management of Landscape Trees, Shrubs, and Vines. 4th ed. Upper Saddle River: Prentice Hall, 2004. Lilly, Sharon. Arborists' Certification Study Guide. Champaign, IL: The International Society of Arboriculture, 2001. Matheny, Nelda and Clark, James R. A Photographic Guide to the Evaluation of Hazard Trees in Urban Areas. Second Edition. Champaign, IL: The International Society of Arboriculture, 1994. Matheny, Nelda and Clark, James R. Trees and Development: A Technical Guide to Preservation of Trees During Land Development. Champaign, IL: The International Society of Arboriculture, 1998. Mattheck, Claus and Breloer, Helge. The Body Language of Trees: A Handbook for Failure Analysis. London: HMSO, 1994 Schwarze, Francis W.M.R. Diagnosis and Prognosis of the Development of Wood Decay in Urban Trees. Australia: ENSPEC Pty Ltd. 2008 Sinclair, Wayne A., Lyon, Howard H., and Johnson, Warren T. Diseases of Trees and Shrubs. Ithaca, New York: Cornell University Press, 1987. Smiley, E. Thomas, Nelda Matheny, and Sharon Lilly. Tree Risk Assessment Best Management Practices, ANSI A300 Part 9: Tree, Shrub, and Other Woody Plant Management —Standard Practices (Tree Risk Assessment: Tree Structure Assessment). The International Society of Arboriculture Press. Champaign. IL. 2011. Thies, Walter G. and Sturrock, Rona N. Laminated root rot in Western North American. United States Department of Agriculture. Pacific Northwest. Resource Bulletin PNW-GTR-349. April 1995. 111 Page Arborist Report: 10429 2401h PI SW SFR (Select Homes Inc.) INSPECTION METHODS I performed a Level 2 Visual Tree Assessment (VTA) for each tree. I visually inspected the tree from the ground, walking around the tree to inspect for any basal defects. I then walked further from the tree, looking up into the crown and branches for any notable defects and symptoms of canopy decline. I measured the diameter of each tree using a Spencer Logging Tape. If a tree had multiple stems, I measured each stem individually and used the method outlined in the Guide for Plant Appraisal, 10th Edition Second Printing, to obtain a single -stem equivalent diameter. The single -stem equivalent is calculated in post -processing and due to this, some trees inventoried on the site may be smaller than the significant/regulated tree size for the subject jurisdiction. These trees are included in the deliverables for informational purposes but are not considered or discussed in the report. When ivy or other obstructions are present, I adjusted the diameter by taking the ivy or obstruction into account. I measured the dripline of the first 5 trees using a measuring tape and then estimated the average dripline of the remaining trees. I tagged each tree using an oval aluminum tag. Using the VTA method, I rated the health and structural condition of each tree. This inspection method is an international industry standard for assessing trees from the ground level and identifies external signs of decay, physical damage, growth related defects, and abnormal or declining foliage. Tree health and structure are each assigned their own condition rating. The following ratings are used: Poor: Lacking a full crown, with more than 50% decline and dieback that especially affects larger branches. Low life expectancy for the species. Fair: Crown decline and dieback up to 30% of the canopy. Below -average life expectancy for the species. Good: Imperfect canopy density in 10% or less of the tree. Typical life expectancy for the species. Excellent: Perfect specimen with excellent form and vigor, along with a well-balanced crown. Exceptional life expectancy for the species. 121 Page Arborist Report: 10429 2401h PI SW SFR (Select Homes Inc.) APPENDIX A - ASSUMPTIONS & LIMITING CONDITIONS 1) Any legal description provided to the consultant/appraiser is assumed to be correct. Any titles and ownerships to any property are assumed to be good and marketable. No responsibility is assumed for matters legal in character. Any and all property is appraised or evaluated as though free and clear, under responsible ownership and competent management. 2) It is assumed that any property is not in violation of any applicable codes, ordinances, statutes or other governmental regulations. 3) The assessment in this report is based on information and data from sources believed to be reliable, correct, and accurately reported. No responsibility is assumed for false or misleading information provided by others. 4) The consultant/appraiser shall not be required to give testimony or to attend court by reason of the report unless subsequent contractual arrangements are made including payment of an additional fee for such services as described in the fee schedule and contract of engagement. 5) Loss or alteration of any part of this report invalidates the entire report. 6) Possession of this report or a copy thereof does not imply right of publication or use for any purpose by any other than the person to whom it is addressed, without the prior expressed written or verbal consent of the consultant/appraiser. 7) Neither all nor any part of the contents of the report, nor copy thereof, shall be conveyed by anyone, including the client to the public through advertising, public relations, news, sales or other media, without the prior expressed written or verbal consent of the consultant/appraiser — particularly as to value conclusions, identity of the consultant/appraiser, or any reference to any professional society or instate or to any initialed designation conferred upon the consultant/appraiser as stated in her qualification. 8) The report and any values expressed herein represent the opinion of the consultant/appraiser, and the consultant's/appraiser's fee is in no way contingent upon the reporting of a specified value, a stipulated result, the occurrence of subsequent event, nor upon any finding to be reported. 9) Sketches, diagrams, graphs, and photographs in this report, being intended as visual aid, are not necessarily to scale and should not be construed as engineering or architectural reports or survey. 10) Unless expressed otherwise: 1) information contained in this report covers only those items that were examined and reflects the condition of those items at the time of inspection; and 2) the inspection is limited to visual examination of accessible items without dissection, excavation, probing or coring. There is not warranty or guarantee, expressed or implied, that problems or deficiencies of the plants or property in question may not arise in the future. 131 Page Arborist Report: 10429 2401h PI SW SFR (Select Homes Inc.) APPENDIX B - CERTIFICATION OF PERFORMANCE I, Katie Hogan, certify that: • 1 have personally inspected the trees on the property referenced in this report and the statements of fact contained in this report are true and correct. • 1 have no present or prospective interest in the property that is the subject of this report, and I have no personal interest with respect to the parties involved. • The reported analysis, opinions, and conclusions are my personal, unbiased professional analysis, opinions, and conclusions. • My analysis, opinions, and conclusions were developed, and this report has been prepared according to commonly accepted arboricultural best practices. • No individuals or organizations have provided significant assistance with the preparation of this report, except those named in the report. • My compensation for completing this assignment is not contingent upon the development or reporting of a predetermined outcome or direction that favors the cause of the client, the results of the assessment, or the occurrence of any subsequent events. Signed: Cascara Tree Consulting, LLC 141 Page Client: Select Homes Inc. Prepared by: Cascara Tree Consulting Address: 10429 240th PI SW, Edmonds Tree Inventory Table PN-8078A, TRAQ Date:2/4/2024 Tree No. Location Species Common Name DBH (in) DBH Multi- Stem (in) Health Rating Structural Rating Dripline Radius (ft) Viable Remove/ Retain Notes/Comments On -Site Tree Table 170 Site Corpus nutathi Pacific dogwood 9.8 6,3,4,6 Fair Fair 12.0 No Remove Ivy on trunk, scorched in fire 171 Site jAbies grandis Grand fir 10.1 Good Good 8.0 lYes Retain Standalone tree, 100% live crown ratio 172 Site Thuja pficata Western redcedar 10.0 Poor Poor 8.0 INo Remove Essentially dead, substantial trunk decay Off -Site Tree Table A Off -site Pseudotsuga menziesii Douglas -fir 18.6 Good Good 12.0 Yes Retain Growing along fence line about 3 to 4 feet from existing asphalt driveway B Off -site Arbutus menziesii Madrone 12.5 4,4,10,5 Good Good 15.0 Yes Retain Located on neighboring property to west, about 3 to 4 feet from fence C Off -site Pseudotsuga menziesii Douglas -fir 25.0 Good Good 16.0 Yes Retain Located on neighboring property to east D Off -site Pseudotsuga menziesii Douglas -fir 19.0 Good Good 15.0 Yes Retain Located on neighboring property to the west, about 10 to 12 feet from fence E Off -site Thuja pficata Western Redcedar 25.5 18,18 Good Fair 18.0 Yes Retain Located on neighboring property to west about 115 to 18 feet from fence Page 1 of 1 Cascara Tree Consulting