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HomeMy WebLinkAboutEX06_TR_Arborist_Report_Pacific_Arboriculture_240729_v11 Yin Yin Leong Level 1 Tree Assessment Prepared For: Yin Yin Leong 1828 NE 20th St Renton, WA 98056 Prepared By: Ryan Seeley ISA Certified Arborist PN-8096AT ISA Certified Climber Specialist ISA Tree Risk Assessment Qualified Date: September 26, 2022 *Updated 7/21/2024* Contents: Introduction Summary Findings and Recommendations Tree Inventory Revegetation -Execution of Plan -Maintenance - H. PERFORMANCE STANDARDS FOR LAND DEVELOPMENT PERMITS Glossary Waiver of Liability Introduction As requested by Yin Yin Leong, I revisited the property on May 31, 2024, to provide an updated assessment of the trees located at 1828 NE 20th St Renton, WA 98056 and go over new plans for proposed construction and document its potential impact on the surrounding trees in the area. Summary I was contacted by Yin Yin Leong to report the measurements, health, and condition of the trees on the property for project feasibility of future construction and to determine how the trees would be impacted and the associated revegetation planning for the future building. Our meeting was to determine the health, condition, and measurements of the trees for the future construction and which surrounding trees would be impacted by proposed plans. Docusign Envelope ID: 104DBDA6-11CD-4791-91FF-7DA2A96942C7 2 Findings and Recommendations On the property of 1828 NE 20th St Renton, WA 98056 there are 24 Significant trees and 4 Landmark trees on the property, several of which are within the Wetland Buffering Zone as shown in the map on Figure 1. Mrs. Leong is requesting to remove the trees to make way for the development of the new property. The size, health, and planned course of action for each tree within the area of proposed demolition is explained in further detail on the Tree Inventory Matrix Yin Yin Leong’s property located on pages 7-11. To protect the trees that are to remain and the surrounding wetland, a root protection zone shall be placed along the dripline of each tree to protect the root system from damage or soil compaction. No heavy equipment, grading or excavation shall enter or take place in the root protection zone as referred to in Figure 4 on page 6. Docusign Envelope ID: 104DBDA6-11CD-4791-91FF-7DA2A96942C7 3 Figure 1. Map is marked as follows: RED – Trees in the way of proposed demolition and requesting to be removed. GREEN - All trees to be protected from construction, explained further in Figure. 4. BLUE – Trees within Wetland Buffering Area Docusign Envelope ID: 104DBDA6-11CD-4791-91FF-7DA2A96942C7 4 Figure 2. Entrance to property is wildly overgrown Docusign Envelope ID: 104DBDA6-11CD-4791-91FF-7DA2A96942C7 5 Figure 3. majority of vegetation on property is Red Alders, Alnus rubra, and under 6” DBH. Those trees under 6” DBH were not itemized or included in this report as they are under significant size and a nuisance species. Docusign Envelope ID: 104DBDA6-11CD-4791-91FF-7DA2A96942C7 6 Figure 4. Root protection standards regarding construction to prevent damage to root system and soil compaction. Docusign Envelope ID: 104DBDA6-11CD-4791-91FF-7DA2A96942C7 7 Tree Inventory Trees inventoried on the property of 1828 NE 20th St Renton, WA 98056 and recommended actions are as follows: 16 Red Alders, Alnus rubra 1 Vine Maple, Acer circinatum 1 English Holly, Ilex aquifolium 4 Apple Trees, Malus Var. 1 American Hazelnut Cluster, Corylus americana 2 Douglas Firs, Pseudotsuga menziesii 1 Big Leaf Maple, Acer macrophyllum 2 Cherry Trees, Prunus Var. *Some trees were inaccessible due to dense vegetation. DBH has been retained from previous report on September 26, 2022. Yin Yin Leong – (1828 NE 20th St) DATE 6/10/2024 Tree # Botanical Name Common Name DBH Vigor Structure Comments/Action Item Credits 1 Alnus rubra Red Alder 12” Good Good Within area of proposed construction. Requesting removal. 0 2 Acer circinatum Vine Maple 19” (12+8+8+10) Good Good Within area of proposed construction. Requesting removal. 0 3 Ilex aquifolium English Holly 27” Good Good Within wetland buffer restoration. Requesting removal of non-native species 0 4 Alnus rubra Red Alder 7” (5+5+2) Good Fair Wetland Retain and monitor. Place protective fencing around dripline of canopy to prevent heavy equipment access and soil compaction. 0 Docusign Envelope ID: 104DBDA6-11CD-4791-91FF-7DA2A96942C7 8 Tree # Botanical Name Common Name DBH Vigor Structure Comments/Action Item Credits 5 Alnus rubra Red Alder 13” Good Good Wetland Retain and monitor. Place protective fencing around dripline of canopy to prevent heavy equipment access and soil compaction. 0 6 Alnus rubra Red Alder 8” Good Good Within area of proposed construction. Requesting removal. 0 7 Alnus rubra Red Alder 8” Good Good Wetland Retain and monitor. Place protective fencing around dripline of canopy to prevent heavy equipment access and soil compaction. 0 8 Alnus rubra Red Alder 8” Good Good Within area of proposed construction. Requesting removal. 0 9 Malus Var. Apple 22” Good Fair Within area of proposed construction. Requesting removal. 0 10 Malus Var. Apple 15” Poor Poor Within area of proposed construction. Requesting removal. 0 11 Corylus cornuta Western Hazelnut (Large cluster) Estimated 38” Poor Poor Within area of proposed construction. Requesting removal. 0 Docusign Envelope ID: 104DBDA6-11CD-4791-91FF-7DA2A96942C7 9 Tree # Botanical Name Common Name DBH Vigor Structure Comments/Action Item Credits 12 Pseudotsuga menziesii Douglas Fir 28” Good Good Within area of proposed construction. Requesting removal. 0 13 Pseudotsuga menziesii Douglas Fir 27” Good Good Within area of proposed construction. Requesting removal. 0 *14 Prunus Var. Cherry 10” Good Good Retain and monitor. Place protective fencing around dripline of canopy to prevent heavy equipment access and soil compaction. 5 *15 Acer macrophyllum Big Leaf Maple 11” Good Good Retain and monitor. Place protective fencing around dripline of canopy to prevent heavy equipment access and soil compaction. 5 16 Alnus rubra Red Alder 11” Good Good Wetland Retain and monitor. Place protective fencing around dripline of canopy to prevent heavy equipment access and soil compaction. 0 17 Alnus rubra Red Alder 7” Good Good Wetland Retain and monitor. Place protective fencing around dripline of canopy to prevent heavy equipment access and soil compaction. 0 Docusign Envelope ID: 104DBDA6-11CD-4791-91FF-7DA2A96942C7 10 Tree # Botanical Name Common Name DBH Vigor Structure Comments/Action Item Credits *18 Alnus rubra Red Alder 14” Good Good Wetland Retain and monitor. Place protective fencing around dripline of canopy to prevent heavy equipment access and soil compaction. 0 *19 Alnus rubra Red Alder 12” Good Good Wetland Retain and monitor. Place protective fencing around dripline of canopy to prevent heavy equipment access and soil compaction. 0 *20 Alnus rubra Red Alder 12” Good Good Retain and monitor. Place protective fencing around dripline of canopy to prevent heavy equipment access and soil compaction. 6 *21 Prunus Var. Cherry 18” Fair Fair Within area of proposed construction. Requesting removal. 0 *22 Alnus rubra Red Alder 10” Good Good Within area of proposed construction. Requesting removal. 0 *23 Malus Var. Apple 19” Poor Poor Within area of proposed construction. Requesting removal. 0 Docusign Envelope ID: 104DBDA6-11CD-4791-91FF-7DA2A96942C7 11 Tree # Botanical Name Common Name DBH Vigor Structure Comments/Action Item Credits 24 Alnus rubra Red Alder 8” Good Good Within area of proposed construction. Requesting removal. 0 25 Alnus rubra Red Alder 11” Good Good Within area of proposed construction. Requesting removal. 0 26 Malus Var. Apple 8” (6+5) Good Good Within area of proposed construction. Requesting removal. 0 27 Alnus rubra Red Alder 10” Good Good Within area of proposed construction. Requesting removal. 0 *28 Alnus rubra Red Alder 10” Good Good Within area of proposed construction. Requesting removal. 0 Total Retention Credits 16 Revegetation In accordance with Renton code Section 4-4-130 regarding PERFORMANCE STANDARDS FOR LAND DEVELOPMENT PERMITS, With the useable lot size of the property of 1828 NE 20th St at 0.58 net acres (25,191 Sqft) would require the property to have 17 retention credits requiring Leong to make up the remaining 1 credit. Docusign Envelope ID: 104DBDA6-11CD-4791-91FF-7DA2A96942C7 12 Qty. Botanical Name Common Name Comments Credits 1 Castanea mollissima Chinese Chestnut Decorative deciduous tree 1 Total Credits Added 1 Figure 5. Location of new trees Docusign Envelope ID: 104DBDA6-11CD-4791-91FF-7DA2A96942C7 13 PERFORMANCE STANDARDS FOR LAND DEVELOPMENT PERMITS 1. Protected Trees: Trees required to be retained or planted pursuant to this subsection H1 are considered protected trees, as defined in RMC 4-11-200, Definitions T. Protected trees shall be retained or planted as follows: a. Minimum Tree Retention Requirements: Properties subject to an active land development permit shall retain a minimum of thirty percent (30%) of all significant trees on site. b. Tree Credit Requirements: With the exception of interior remodels not involving any building addition, removal of trees, or alteration of impervious areas, properties subject to an active land development permit shall comply with all of the following minimum tree credit requirements, and apply the tree credit value table in subsection H1bv of this Section: i. Tree credit requirements shall apply at a minimum rate of thirty (30) credits per net acre. ii. Either tree retention or a combination of tree retention and supplemental tree planting (with new small, medium, or large tree species) shall be provided to meet or exceed the minimum tree credits required for the site. iii. Supplemental tree planting shall consist of new small, medium, or large species trees, as defined in RMC 4-11-200, Definitions T. The supplemental trees shall be planted with a minimum size of two-inch (2") caliper, or evergreen trees with a minimum size of six feet (6') tall. The Administrator shall have the authority to approve, deny, or restrict the tree species for proposed supplemental trees. iv. Within subdivisions, location of supplemental tree replanting shall be prioritized within tree tract(s) versus individual lots. v. Tree credit value for each tree, existing or new, is assigned as shown in the following table: TREE SIZE TREE CREDITS New small species tree 0.25 New medium species tree 1 New large species tree 2 Preserved tree 6 – 9 caliper inches 4 Preserved tree 10 – 12 caliper inches 5 Docusign Envelope ID: 104DBDA6-11CD-4791-91FF-7DA2A96942C7 14 TREE SIZE TREE CREDITS Preserved tree 12 – 15 caliper inches 6 Preserved tree 16 – 18 caliper inches 7 Preserved tree 19 – 21 caliper inches 8 Preserved tree 22 – 24 caliper inches 9 Preserved tree 25 – 28 caliper inches 10 Preserved tree 29 – 32 caliper inches 11 Preserved tree 33 – 36 caliper inches 12 Preserved tree 37 caliper inches and greater 13 Example: A 0.22 net acre (9,583.2 square feet) lot would need seven (7) tree credits (30 x 0.22 = 6.6, rounded up to 7). The tree credit requirements for the lot could be met by retaining one existing seventeen-inch (17") tree (seven (7) tree credits) or by planting three (3) new large species trees (two (2) tree credits each) and one new medium species tree (one tree credit). c. Priority of Tree Retention Requirements: All significant trees required to be retained shall be preserved in the priority order listed below, with Priority One trees being the highest priority. Applications that propose retention of lower priority trees in lieu of Priority One trees must demonstrate in writing to the Administrator’s satisfaction that: (i) all reasonable efforts have been taken to preserve trees utilizing the highest priority possible, (ii) that retention of higher priority trees is not feasible or practical for the project site, and (iii) that the project proposal Docusign Envelope ID: 104DBDA6-11CD-4791-91FF-7DA2A96942C7 15 meets or exceeds the purposes and intent of this Section. Significant trees shall be retained in the following priority order: 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; v. Significant trees over sixty feet (60') in height or greater than eighteen inches (18") caliper; and vi. Trees that shelter interior trees or trees on abutting properties from strong winds, which could otherwise allow such sheltered trees to be blown down if removed. 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. d. Calculating Tree Retention: Tree retention standards shall be applied to the developable area, as defined in RMC 4-11-040, Definitions D, of a property. Land within public trails shall be excluded for calculation of tree retention provided the trail design serves to retain Priority One trees, pursuant to subsection H1c of this Section. If the number of trees required for compliance with minimum tree retention or minimum tree credit requirements includes a fraction of a tree, any amount equal to or greater than one-half (1/2) tree shall be rounded up. Docusign Envelope ID: 104DBDA6-11CD-4791-91FF-7DA2A96942C7 16 e. Replacement Requirements: The Administrator may authorize the planting of replacement trees, as an alternative to retaining trees in conformance with subsection H1a of this Section, provided it can be demonstrated to the Administrator’s satisfaction that an insufficient number of trees can be retained, the proposed removal and replacement is the minimum necessary to accomplish the desired purpose, and the tree replacement complies with the following: i. Replacement Criteria: Replacement planting in lieu of minimum tree retention may be granted for situations where: (a) There are special circumstances related to the size, shape, topography, location, or surroundings of the subject property; or (b) The strict application of the code would prevent reasonable use of property; or (c) The strict application of the code would prevent compliance with minimum density requirements of the zone; or (d) The project is a short plat with four (4) or fewer lots. ii. Replacement Quantity and Standards: When the minimum number of protected trees cannot be retained, replacement trees with at least a two-inch (2") caliper, or evergreen trees at least six feet (6') tall, shall be planted based on the tree credit value of each protected tree removed pursuant to the table shown in subsection H1b of this Section. The protected trees used for calculating required credit replacement shall be determined based on the priority order of the significant trees proposed for removal on site. Replacement trees shall not contribute to the total credits required pursuant to subsection H1b of this Section. The City may require a surety or bond to ensure the survival of replacement trees. iii. Replacement Tree Species: The Administrator shall have the authority to approve, deny, or restrict the tree species for proposed replacement trees. f. Fee in Lieu: When the Administrator determines that it is infeasible to replace or supplement trees on the site, payment into the City’s Urban Forestry Program fund may be approved in an amount of money approximating the current market value of the replacement trees and the labor to install them. The City shall determine the value of replacement trees. 2. Tree Retention Within Subdivisions: Tree retention within subdivisions shall be conducted in accordance with the following requirements: a. Tree Preservation Priority: All trees required to be retained within a subdivision shall be preserved in the priority order listed below, with Tier 1 being the highest priority. Applications that propose compliance with a lower priority tier, or a combination of tiers, must demonstrate in writing to the Administrator’s satisfaction that: (i) all reasonable efforts have been taken to preserve trees utilizing the highest priority tier possible, (ii) that compliance with a higher tier is not feasible or practical for the project site, and (iii) that the project proposal meets or exceeds the purposes and intent of this Section. Tree preservation shall be prioritized as follows: Docusign Envelope ID: 104DBDA6-11CD-4791-91FF-7DA2A96942C7 17 i. Tier 1 – Tree Protection Tract. Protection of trees or groves by placement within a dedicated tract. ii. Tier 2 – Tree Protection Easement or Restrictive Covenant. Protection of trees or groves by recordation of a permanent tree protection easement (for groves of trees) or a restrictive covenant (for individual trees). iii. Tier 3 – Retention and Mitigation. Retention and removal of trees, with subsequent mitigation by replanting. iv. Tier 4 – Fee in Lieu of Planting. Fee in lieu of planting pursuant to subsection H1f of this Section. b. Tree Protection Tract and Easement Standards: i. Tree protection tracts and easements should consist of an aggregation of trees occupying a specific area and sufficiently uniform in species composition, size, age, arrangement, and condition as to be distinguished from adjoining areas; ii. Trees shall be retained and maintained pursuant to the recommendations of an ISA certified arborist or ASCA certified consultant; iii. Amenities, as approved by the Administrator, may be installed to facilitate passive recreation within the tract or easement. Such amenities might include, but are not limited to, benches, picnic tables, and soft surface (semi-permeable) trails. c. Replacement and Supplemental Planting Locations: The planting of all replacement trees or supplemental trees shall be prioritized within tree protection tract(s) or tree protection easement(s), when applicable, to the maximum extent feasible to provide for adequate tree growth and heath. d. Deed Restriction: The permit holder shall establish and record a permanent and irrevocable deed restriction on the property title of any tree protection tract or easement created as a condition of a permit. Such deed restriction(s) shall prohibit development, alteration, or disturbance within the tract or easement except for purposes of installing Administrator- approved amenities, or habitat enhancement activities as part of an enhancement project, which has received prior written approval from the City. A covenant shall be placed on any tract restricting its separate sale. e. Fencing: The City shall require permanent fencing of the tree protection tract or easement. This shall be accomplished by installing a wood, split-rail fence with applicable signage. The Administrator may approve pedestrian-sized openings for the purpose of facilitating passive recreation within the tract for the benefit of the community. The Administrator may authorize alternate styles and/or materials for the required fencing. f. Signage Required: The common boundary between a tree protection tract and the abutting land must be permanently identified. This identification shall include permanent wood or metal signs on treated wood, or metal posts. Sign locations and size specifications are subject to City Docusign Envelope ID: 104DBDA6-11CD-4791-91FF-7DA2A96942C7 18 review for approval. Suggested wording is as follows: “Protection of these trees is in your care. Alteration or disturbance is prohibited by law.” g. Responsibility for Ownership and Maintenance: The relevant homeowners’ association, abutting lot owners, the permit applicant or designee, or other City approved entity shall have ownership and responsibility for maintaining the tree protection tract(s), easement(s), and protected trees. h. Maintenance Covenant and Note Required: The following note shall appear on the face of all plats, short plats, PUDs, or other approved site plans containing at least one tree protection tract or easement, and shall also be recorded as a covenant running with the land on the title of record for all affected lots on the title: “MAINTENANCE RESPONSIBILITY: All owners of lots created by or benefiting from this City action are responsible for maintenance and protection of the tree protection tract/easement. Maintenance includes ensuring that no alterations occur within the tract/easement and that all vegetation remains undisturbed unless the express written authorization of the City has been received.” 3. Tree Retention/Land Clearing (Tree Inventory) Plan Required: When a land development permit, as defined in RMC 4-11-120, is submitted to the City it shall be accompanied by a tree retention/land clearing (tree inventory) plan pursuant to RMC 4-8-120, Submittal Requirements – Specific to Application Type. 4. Arborist Report Required: When a land development permit, as defined in RMC 4-11-120, is submitted to the City it shall be accompanied by an arborist report pursuant to RMC 4-8-120, Submittal Requirements – Specific to Application Type. 5. Applicability, Performance Standards, and Alternates: All land clearing and tree removal activities shall conform to the criteria and performance standards set forth in this Section unless otherwise recommended in an approved soil engineering, engineering geology, hydrology, or forest management plan and where the alternate procedures will be equal to or superior in achieving the purposes of this Section. All land clearing and tree removal activities may be conditioned to ensure that the standards, criteria, and purposes of this Section are met. 6. General Review Criteria: All land clearing and tree removal activities shall comply with RMC 4-4-060, Grading, Excavation, and Mining Regulations, and shall meet the following criteria: a. The land clearing and tree removal will not create or contribute to landslides, accelerated soil creep, settlement or subsidence, flooding, erosion, or increased turbidity, siltation, or other form of pollution in a watercourse. Docusign Envelope ID: 104DBDA6-11CD-4791-91FF-7DA2A96942C7 19 b. Land clearing and tree removal will be conducted to maintain or provide visual screening and buffering between land uses of differing intensity, consistent with applicable landscaping and setback provisions of the Renton Municipal Code. c. Land clearing and tree removal shall be conducted so as to expose the smallest practical area of soil to erosion for the least possible time, consistent with an approved build-out schedule and including any necessary erosion control measures. d. Land clearing and tree removal shall be consistent with subsection D3 of this Section, Restrictions for Critical Areas – General, and RMC 4-3-050, Critical Areas Regulations. e. The land clearing and tree removal shall not create or contribute to a hazardous condition, such as increased potential for blowdown, pest infestation, disease, or other problems that may result from selectively removing trees and other vegetation from a lot. f. Land clearing and tree removal shall be conducted to maximize the preservation of any tree in good health that is an outstanding specimen because of its size, form, shape, age, color, rarity, or other distinction as a community landmark. (Ord. 5840, 6-12-2017) 7. Timing: The City may restrict the timing of the land clearing and tree removal activities to specific dates and/or seasons when such restrictions are necessary for the public health, safety and welfare, or for the protection of the environment. 8. Restrictions for Critical Areas: See subsection D3 of this Section, Restrictions for Critical Areas – General, and RMC 4-3-050, Critical Areas Regulations. 9. Condition Measures for Tree/Ground Cover Retention: The following measures may be used in conditioning a land development permit or building permit proposal, to comply with the general review criteria of subsection H6 of this Section, General Review Criteria: a. Trees shall be maintained to the maximum extent feasible on the property where they are growing. Modification of the tree retention and land clearing plan, or the associated land development permit, may be required to ensure the retention of the maximum number of trees. b. The applicant may be required to replace trees, provide interim erosion control, hydroseed exposed soils, or other similar conditions which would implement the intent of this Section. c. Trees that shelter interior trees or trees on abutting properties from strong winds that could otherwise cause them to blow down should be retained. (Ord. 5676, 12-3-2012) Docusign Envelope ID: 104DBDA6-11CD-4791-91FF-7DA2A96942C7 20 10. Protection Measures During Construction: Protection measures in this subsection shall apply for all trees that are to be retained on site and off site. Off-site trees containing drip lines that encroach onto the site under construction shall be considered protected trees unless the applicant obtains written permission from the abutting property owner to remove the off-site trees and it is determined that the tree removal on the abutting property is in compliance with subsection C of this Section, Allowed Tree Removal Activities. All of the following tree protection measures shall apply: a. Temporary Tree Protection Fencing: Prior to development activities, the applicant shall erect and maintain a six-foot (6') high, post-driven, chain-link temporary construction fence around the drip lines of all retained trees, or if a tree protection tract or easement is provided, along the perimeter of the tree protection tract or easement. The temporary tree protection fencing shall be installed with steel posts driven at a depth that will adequately ensure the fence remains in an upright position for the duration of the development. The temporary tree protection fencing shall not be disturbed, removed, or relocated until the conclusion of construction activities. Protected trees may be fenced individually or in groups of trees. Individual trees shall be fenced on four (4) sides. If some tree or vegetation removal is necessary in order to gain access to retained trees for the purposes of installing temporary tree protection fencing, the applicant shall submit a phased tree removal plan for review and approval by the Administrator, prior to all development activities. b. Tree Protection Signage: Signage shall be placed on the tree protection fencing at intervals of no more than twenty feet (20') along the entirety of the protective tree fence. The sign(s) shall be designed, constructed, and installed in accordance with official specifications provided by the Administrator and shall convey the information deemed necessary by the Administrator. c. Construction Storage Prohibited: The applicant may not fill, excavate, stack, or store any equipment, dispose of any materials, supplies or fluids, operate any equipment, or compact the earth in any way within the area defined by the drip line of any tree to be retained. d. 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 drip line. e. 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, unless otherwise approved by the City. (Ord. 5958, 12-9-2019) f. Utilities Prohibited Within the Drip Line: The applicant may not install utilities within the area defined by the drip line of any tree to be retained, unless otherwise approved by the City. g. 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) Docusign Envelope ID: 104DBDA6-11CD-4791-91FF-7DA2A96942C7 21 h. Vegetation and Undergrowth Protection: With the exception of invasive species removal which has received prior written approval from the City, removal of the existing vegetation within the drip line of protected trees is prohibited during development activities. Native understory trees, shrubs, and other vegetation shall be protected within the designated tree protection area for the duration of the development activities. All areas within the required fencing shall be covered evenly with a minimum of three inches (3") of bark mulch prior to installation of the protective fencing, except in areas where mulch will adversely affect protected ground cover plants. (Ord. 5676, 12-3-2012) i. Monitoring Required During Construction: For all protected trees required to be retained in compliance with a land use decision, the applicant shall retain an ISA certified arborist or ASCA certified consultant 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. The ISA certified arborist or ASCA certified consultant shall supervise the installation of any required tree protection fencing, permanent or temporary. j. Alternative Protection: Alternative safeguards may be used if determined by the Administrator that such safeguards would provide equal or greater tree protection. (Ord. 5676, 12-3-2012; Ord. 5841, 6-12-2017) 11. Maintenance: a. All retained and replacement trees, including protected trees, shall be maintained in perpetuity from the date of the final land development permit issued for the project, unless tree removal is authorized pursuant to this Section; b. All retained trees and vegetation shall be pruned and trimmed to maintain a healthy growing condition or to prevent limb failure; c. With the exception of high-risk trees specifically retained to provide wildlife habitat, any protected tree that becomes a high-risk tree, as defined in RMC 4-11-200, or any protected or replacement tree that is removed, shall be replaced within three (3) months or during the next planting season if the loss does not occur in a planting season. Docusign Envelope ID: 104DBDA6-11CD-4791-91FF-7DA2A96942C7 22 Glossary Arborist: A person possessing the technical competence through experience and related training to provide for or supervise the management of trees or other woody plants in a landscape setting. Basic Level 2 Risk Assessment: A detailed visual inspection of a tree and its surrounding site and a synthesis of the information collected. Canopy/crown: Upper part of a tree bearing foliage, limbs, and branches, measured from the lowest branch including all branches and foliage. Co-dominant Stem: A structurally unstable branch union often associated with a high risk of failure. A term used to describe two or more main stems (or "leaders") that are about the same diameter and emerge from the same location on the main trunk. Crown Cleaning: In pruning, the selective removal of dead, dying, diseased and broken branches from the tree crown. Diameter at Breast Height: A standard measurement of a tree most often taken at 4.5 feet from the base of the tree; however, this can vary depending if the tree has multiple trunks or is growing on a slope. Hazard Tree: A tree that meets all the following criteria: a. Has a combination of structural defects and/or disease which makes it subject to a high probability of failure; b. Is in proximity to moderate to high frequency targets (persons or property that can be damaged by tree failure); and c. The hazard condition of the tree cannot be lessened with reasonable and proper arboricultural practices nor can the target be removed. Live Crown Ratio: The ratio of the size of a tree's live crown to its total height. Used in estimating a tree’s health and its level of competition with neighboring trees. Mechanical Damage: Trees are often wounded by careless use of yard equipment like mowers, weed whackers, and other trimming equipment. These injuries cut through important vascular tissue just inside the bark that can lead to decay and ultimately death of the tree. A ring of natural mulch or arborist wood chips around the tree eliminates the need to trim or mow close to the tree's base. Extreme care should be taken when digging up or tilling the soil under a tree. Many large and small roots will be cut by such digging, especially if it occurs close to the trunk. Docusign Envelope ID: 104DBDA6-11CD-4791-91FF-7DA2A96942C7 23 Monitor: It is important to monitor mature trees on a regular schedule, at least once a year. Monitoring would include a Visual Tree Assessment to look for changes in habit and structure, and to document signs of weakness or decline in health and integrity of the trees. Options for Mitigation of Risk Trees: • Remove the risk altogether, if possible, by cutting off one or more branches, removing dead wood, or possibly removing the entire tree. Extreme risk situations should be closed off until the risk is abated. • Modify the risk of failure probability. In some cases, it may be possible to reduce the probability of failure by adding mechanical support in the form of cables braces or props. • Modify the risk rating by moving the target. Risk ratings can sometimes be lowered by moving the target so that there is a much lower probability of the defective part striking anything. Moving the target should generally be seen as an interim measure. • Retain and monitor. This approach is used where some defects have been noted but they are not yet serious and the present risk level is only moderate. • Convert those trees slated for removal into Wildlife Habitat Snags. Reduce the overall height of the tree using natural fracture pruning techniques to heights relative to the targets. Pruning: Selective removal of woody plant parts of any size, using saws, pruners, clippers, or other pruning tools. The reason for tree pruning may include, but is not limited to, reducing risk, managing tree health and structure and/or improving aesthetics or achieving other specific objectives. Pruning objectives should include pruning out all dead, diseased, weak and/or broken branches in all tree canopies, and crown cleaning. Snag or Habitat Snag: A standing, dead or dying tree, often missing a top or most of the smaller branches important for wildlife in both natural and landscaped settings, occurring as a result of disease, lightning, fire, animal damage, too much shade, drought, root competition, or old age. May also be a component in slope stability and ongoing vegetation management practices. Threshold for Risk: Each individual is entitled to and can determine his or the own threshold for risk. Threshold for risk is subjective, and can be influenced by a person’s view, taste or opinion. Topping: Topping is the indiscriminate cutting of tree branches to stubs or to lateral branches that are not large enough to assume the terminal role. Other names for topping include “heading,” “tipping,” “hat-racking,” and “rounding over.” Topping is not a viable method of height reduction and does not reduce future risk. In fact, topping will increase risk in the long term. Topping is not considered an acceptable arboriculture practice. Docusign Envelope ID: 104DBDA6-11CD-4791-91FF-7DA2A96942C7 24 Urban Forestry: Management of naturally occurring and planted trees in urban areas. Vigor: Overall health; the capacity to grow and resist physiological stress. • Good: Shoot growth, leaf size and leaf color are typical of the tree age and species. • Fair: Shoot growth, leaf size, and leaf color are below average for the tree age and species. Some deadwood is evident in the crown. Treatment may be required to foster improved future growth. • Poor: Shoot growth, leaf size, and leaf color are highly stunted, and there is a significant number of dead twigs and branches in the crown. Docusign Envelope ID: 104DBDA6-11CD-4791-91FF-7DA2A96942C7 25 Waiver of Liability There are many conditions affecting a tree’s health and stability which may be present but cannot be ascertained such as root rot, previous or unexposed construction damage, internal cracks, stem rot and more. Changes in circumstances and conditions can also cause a rapid deterioration of a tree’s health and stability. Adverse weather conditions can dramatically affect the health and safety of a tree in a very short amount of time. While I have used every reasonable means to examine this plant, this evaluation represents my opinion of the tree health at this point in time. These findings do not guarantee future safety nor are they predictions of future events. The tree evaluation consists of an external visual inspection of an individual tree’s root flare, trunk, and canopy from the ground only, unless otherwise specified. The inspection may also consist of taking trunk or root soundings for sound comparisons to aid the evaluator in determining the possible extent of decay within a tree. Soundings are only an aid to the evaluation process and do not replace the use of other more sophisticated diagnostic tools for determining the extent of decay within a tree. As conditions change, it is the responsibility of the property owners to schedule additional site visits by the ISA Certified Arborist. It is the responsibility of the property owner to obtain all required permits from city, county, state, or federal agencies. It is the responsibility of the property owner to comply with all applicable laws, regulations, and permit conditions. If there is a homeowner’s association, it is the responsibility of the property owner to comply with all Codes, Covenants, and Restrictions (CC&R’s) that apply to tree pruning and tree removal. This tree evaluation is to be used to inform and guide the client in the management of their trees. This in no way implies that the evaluator is responsible for performing recommended actions or using other methods or tools to further determine the extent of internal tree problems without written authorization from the client. Furthermore, the evaluator in no way holds that the opinions and recommendations are the only actions required to ensure that the tree will not fail. A second opinion is recommended. The client shall hold the evaluator harmless for any and all injuries or damages incurred if the evaluator’s recommendations are not followed or for acts of nature beyond the evaluator’s reasonable expectations, such as severe winds, excessive rains, heavy snow loads, etc. This report and all attachments, enclosures, and references are confidential and are for the use of the client concerned. They may not be reproduced, used in any way, or disseminated in any form without the prior consent of the client concerned and ISA Certified Arborist Ryan Seeley. Thank you for allowing me to be of service. Please contact me with any questions or concerns. Sincerely, Ryan Seeley (253)-266-5665 ISA Certified Arborist PN-8096AT ISA Certified Tree Worker Climber Specialist ISA Tree Risk Assessment Qualified Docusign Envelope ID: 104DBDA6-11CD-4791-91FF-7DA2A96942C7