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Home My WebLink AboutEx_08_Tree_Retention_WorksheetKaren Kiest | Landscape Architects KK | LA 111 west john street suite 306|seattle washington|98119|206 323 6032|www.kk-la.com February 2, 2023 City of Renton Attn: Brittney Gillia Project Name: Swanson Gardner Meyers Office Parking lot expansion Address: 4512 Talbot Road S. # PRE22-000204, PSUB22-000345 Re: Removal of existing tree for parking lot expansion We are writing to address the removal of the 23” Austrian Pine tree (# 8171) for the expansion of the parking lot and landscape beautification at Swanson Gardner Meyers office. This tree was retained during the office remodel phase (# B1900-5306) in order to meet the tree retention code at the time of permitting, which required 10% of significant trees to remain within industrial/commercial zoning. By retaining this one tree, out of a total of 8 existing significant trees, the project met the requirement. With this new phase of work, the existing pine tree cannot be retained. Under the tree replacement calculation codes, removal of this 23” significant tree requires replacement with 9 tree credits. The new plantings we are proposing for this are: •1 @ 2” Elizabeth Magnolias (“medium tree”) = 1 credit •4 @ Douglas fir trees (“large tree”) = 8 credits For a total of 9 replacement tree credits. Please see the attached worksheets reflecting the replacement calculations and the trees proposed to meet the tree credit requirement (19) and replacement requirements (9). Please contact me if you have any questions or comments. Sincerely, Meredith Hall Exhibit 8 DocuSign Envelope ID: 57BD3737-A63F-4813-88F2-F0381C7D329D rentonwa.gov/permitcenter | planningcustomerservice@rentonwa.gov | 425-430-7294 10/6/2022 Page 1 of 3 CITY OF RENTON Ι PERMIT CENTER TREE RETENTION AND CREDIT WORKSHEET TREE RETENTION REQUIREMENTS A minimum retention of thirty percent (30%) of all significant trees (as defined in RMC 4-11-200) is required on site. Please complete the form below to verify compliance with minimum tree retention requirements. • Identify total number of trees 6-inch caliper or greater (or alder or cottonwood trees 8-inch caliper or greater) on site: Trees Trees Trees Trees Trees Trees Required Trees Proposed •Deductions – Certain trees are excluded from the retention calculation: o Trees that are high-risk, as defined in RMC 4-11-200: o Trees within existing and proposed public right-of-way: o Trees within wetlands, streams, very high landslide hazards, protected slopes, and associated buffers: •Total remaining trees after deductions: •Required tree retention (30%): •Identify number of trees proposed for retention: •Identify number of trees requested for replacement in lieu of retention (skip page 3 if no tree replacement is requested):Trees TREE CREDIT REQUIREMENTS Tree credit requirements apply at a minimum rate of thirty (30) credits per net acre. Complete the form below to determine minimum tree credit requirements. •Gross area of property in square feet: Square Feet •Deductions: Certain areas are excluded from tree credit calculation: o Existing and proposed public right-of-way: Square Feet o Wetlands, streams, very high landslide hazards, protected slopes, and associated buffers: Square Feet •Total excluded area:Square Feet •Net land area (after deductions) in square feet:Square Feet •Net land area (after deductions) in acres:Acres •Required tree credits:Tree Credits Required 2 2 0.6 0 0.6 26293 0 26293 0.6036042240587696 18.108126721763085 DocuSign Envelope ID: 57BD3737-A63F-4813-88F2-F0381C7D329D rentonwa.gov/permitcenter | planningcustomerservice@rentonwa.gov | 425-430-7294 10/6/2022 Page 2 of 3 TREE RETENTION AND CREDIT WORKSHEET PROPOSED TREE CREDITS Please complete the table below to calculate the total tree credits proposed for your project. Identify the quantity of trees for each tree category, after deducting trees within excluded areas, as shown in the previous section. TREE SIZE TREE CREDITS TREE QUANTITY TOTAL TREE CREDITS RETAINED TREES Preserved tree 6 – 9” caliper 4 Preserved tree 10 – 12” caliper 5 Preserved tree 12 – 15” caliper 6 Preserved tree 16 – 18” caliper 7 Preserved tree 19 – 21” caliper 8 Preserved tree 22 – 24” caliper 9 Preserved tree 25 – 28” caliper 10 Preserved tree 29 – 32” caliper 11 Preserved tree 33 – 36” caliper 12 Preserved tree 37” caliper and greater 13 NEW TREES New small species tree (30' or less at maturity) 0.25 New medium species tree (30' to 50' at maturity) 1 New large species tree (50' or more at maturity) 2 TREE CREDITS PROPOSED: TREE REPLACEMENT PLANTINGS (see worksheet next page) Phase 2 4 @ Doug Fir (large) 1 @ Elizabeth Magnolia (med) TREE RETENTION CREDITS (19 required) Phase 1 Trees - existing < 6" caliper 3 @ Crape Myrtle (sm) 3 @ Vine Maple (sm) 2 @ Doug Fir (large) Phase 2 1 @ Crape Myrtle (sm) 5 @ Stewartia (med) 2 @ Eddie's White Wonder Dogwood (med) 3 @ Zelkova (large) By Weatherly 6 @ Little Gem Southern Magnolia (sm) 13 7 5 20.25 0 0 0 0 0 0 0 0 0 0 3.25 7 10 DocuSign Envelope ID: 57BD3737-A63F-4813-88F2-F0381C7D329D rentonwa.gov/permitcenter | planningcustomerservice@rentonwa.gov | 425-430-7294 10/6/2022 Page 3 of 3 TREE RETENTION AND CREDIT WORKSHEET TREE REPLACEMENT JUSTIFICATION Replacement may be authorized as an alternative to 30% retention provided the removal is the minimum necessary to accomplish the desired purpose and provided the proposal meets one of the following options: 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. Please attach a written justification demonstrating compliance with the requirements and criteria as descripted above. TREE REPLACEMENT QUANTITY Tree replacement quantity is determined based on the credit value of the trees proposed for removal. Larger, higher priority trees shall be used for calculation of tree replacement. Identify the quantity of each tree requested to be removed in lieu of 30% retention, based on tree size. List the identification number of each tree, as indicated in the arborist report. TREE SIZE TREE CREDITS TREE QUANTITY TREE INDENTIFICATION # TOTAL TREE CREDITS Tree 37” caliper + 13 Tree 33 – 36” caliper 12 Tree 29 – 32” caliper 11 Tree 25 – 28” caliper 10 Tree 22 – 24” caliper 9 Tree 19 – 21” caliper 8 Tree 16 – 18” caliper 7 Tree 12 – 15” caliper 6 Tree 10 – 12” caliper 5 Tree 6 – 9” caliper 4 REPLACEMENT CREDITS REQUIRED: TREE REPLACEMENT PLANTING Identify the quantity of proposed new replacement trees (minimum size of 2-inch caliper). The total replacement credits proposed should be equal to or greater than the replacement credits required, as shown in the previous section. TREE SIZE TREE CREDITS TREE QUANTITY TOTAL TREE CREDITS New small species tree (30' or less at maturity) 0.25 New medium species tree (30' to 50' at maturity) 1 New large species tree (50' or more at maturity) 2 REPLACEMENT CREDITS PROPOSED: (see tree list previous page) 1 9 1 4 0 0 0 0 9 0 0 0 0 0 0 1 8 9 DocuSign Envelope ID: 57BD3737-A63F-4813-88F2-F0381C7D329D