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TreeRetentionWorksheet.doc 12/08
City of Renton
TREE RETENTION
WORKSHEET
1. Total number of trees over 6” in diameter1 on project site: 1. 34 trees
2. Deductions: Certain trees are excluded from the retention calculation:
Trees that are dead, diseased or dangerous2 ____3___ trees
Trees in proposed public streets ____0___ trees
Trees in proposed private access easements/tracts ____7___ trees
Trees in critical areas3 and buffers ____0___ trees
Total number of excluded trees: 2. _______10 ____ trees
3. Subtract line 2 from line 1: 3. ______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, or R-8
0.1 in all other residential zones
0.05 in all commercial and industrial zones 4. _____7.2____ trees
5. List the number of 6" or larger trees that you are proposing5 to retain4:
5. _____ 3____ trees
6. Subtract line 5 from line 4 for trees to be replaced: 6. ____4_____ trees (If line 6 is less than zero, stop here. No replacement trees are required).
7. Multiply line 6 by 12” for number of required replacement inches: 0
7. _______48_____ inches
8. Proposed size of trees to meet additional planting requirement:
(Minimum 2” caliper trees required) 8. ______2______ 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)
9. _______24_____ trees
1. Measured at chest height.
2. Dead, diseased or dangerous trees must be certified as such by a forester, registered landscape architect, or
certified arborist, and approved by the City.
3. Critical Areas, such as wetlands, streams, floodplains and protected slopes, are defined in Section 4-3-050 of
the Renton Municipal Code (RMC).
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. Inches of street trees, inches of trees added to critical areas/buffers, and inches of trees retained on site that
are less than 6" but are greater than 2" can be used to meet the tree replacement requirement.