HomeMy WebLinkAboutTR_TreeRetentionWorksheet_181221_v1DEPARTMENT OF COMMUNITY
AND ECONOMIC DEVELOPMENT
1
P:\project\0061\18002\Permit Apps\TreeRetentionWorksheet.docx 03/2015
TREE RETENTION
WORKSHEET
Planning Division
1055 South Grady Way-Renton, WA 98057
Phone: 425-430-7200 Fax: 425-430-7231
1. Total number of trees over 6” diameter1, or alder or cottonwood
trees at least 8” in diameter on project site 24 trees
2. Deductions: Certain trees are excluded from the retention calculation:
Trees that are dangerous2 trees
Trees in proposed public streets trees
Trees in proposed private access easements/tracts trees
Trees in critical areas3 and buffers trees
Total number of excluded trees: 0 trees
3. Subtract line 2 from line 1: 24 trees
4. Next, to determine the number of trees that must be retained4, multiply line 3 by:
0.3 in zones RC, R-1, R-4, R-6 or R-8
0.2 in all other residential zones
0.1 in all commercial and industrial zones 5 trees
5. List the number of 6” in diameter, or alder or cottonwood trees
over 8” in diameter that you are proposing5 to retain4: 11 trees
6. Subtract line 5 from line 4 for trees to be replaced:
(if line 6 is zero or less, stop here. No replacement trees are required) 0 trees
7. Multiply line 6 by 12” for number of required replacement inches: inches
8. Proposed size of trees to meet additional planting requirement:
(Minimum 2” caliper trees required) inches per tree
9. Divide line 7 by line 8 for number of replacement trees6:
(If remainder is .5 or greater, round up to the next whole number) trees
1 Measured at 4.5’ above grade.
2 A tree 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, and approved by the City.
3 Critical areas, such as wetlands, streams, floodplains and protected slopes, are defined in RMC 4-3-050.
4 Count only those trees to be retained outside of critical areas and buffers.
5 The City may require modification of the tree retention plan to ensure retention of the maximum number of trees per RMC 4-4-130H7a.
6 When the required number of protected trees cannot be retained, replacement trees, with at least a two -inch (2") caliper or an evergreen at least
six feet (6') tall, shall be planted. See RMC 4-4-130.H.1.e.(ii) for prohibited types of replacement trees.