HomeMy WebLinkAboutTR_Tree_Retention_Worksheet_170821_v1DEPARTMENT OF COMMUNITY
AND ECONOMIC DEVELOPMENT
Planning Division
1Q55 South Grady Way -Renton., WA 98057
Phone: 425-430-7200 1 www-rentonwq.gqv
CITY OF
n;
1. Totalnu ber of trees over6" dia eter1, or alder or cottonwood
trees at least 8" in diameter on project site moi/ trees
2.
3.
M"A
5.
DeDeductions:Certain trees are excluded from the retention calculation:
Trees that are dangeroUS2
Trees
Trees
Trees
in proposed public streets
in proposed private access easements/tracts
in critical areas 3 and buffers
Total number of excluded trees:
Subtract line 2 from Line 1:
Next, tn determine thin number of trees that must be retained4,
0.3 in zones RC, R-1. R-4. R-6 or R-8
0-.2 in all
0.1 in all
other residential zones
commercial and industrial zones
List the number of 6
over 8" in diameter that you are DrC DC sinG!5 tc retain4
" in diameter, or alder or cottonwood 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)
multiply line 3 by:
7. Multiply line 6 by 12" for number of required replacement inches:
8. Proposed size of trees to meet additional planting requirement:
(Minimum 2" caliper trees required)
trees
trees
trees
trees
trees
trees
trees
-�^ trees
trees
inches
nches per tree
9,m Divide line 7 by line 8 for number of replacement treeS60
(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 diad, 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,s
4 Count only those trees to be retained outside of criticsl areas and buffers.
� The City may require modification of the tree retention plan to ensure retention of the maximum number of trees per RMC 4-4-13OH7a.
s
When the required number of protected trees cannot be retained, replacement trees, with at least a two-inch (2."") capper or an evergreen at feast
six feet �6'] tall� shall be �Iante�. See RMC 40411130.H.�.e.�i�} fog prohibited types of replacement trees.
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C:\Users\Cra*1g K\Downloads\Tree Retention Works heet. doc Rev: 08/201S
Minimum Tree Density
A minimum tree density shall be maintained on each residentially zoned
dwellings in R-10 and R-14). The tree density may consist of existing trees
combination.
lot (exempting single-family
J. replacement trees, or a
Detached single-family development': Two (22) significant trees 8 for every five thousand (5,000) sq. ft. of lot
area. For example, d lot with 9, 600 square feet and a detached 51"ngle- amily house is required to have four (4)
significant trees or their equivalent in caliper inches (one or more trees with a combined diameter of 24").9 This
is determined with the foliowingformuiaA0
LotAreo
x 2 = MnimumiNum6erof Trees
S, 0010 sq.ft.
Multi -family development (attached dwellings): Four (4) significant trees 8 for every five thousand (5,000) sq.
ft. of lot area.
LotArea
S, 000 sq.ft.
x 4 = MmminiuNumber of Trees
Example Tree Density Table:
Lot Lot size Min significant New Trees Retained Trees Compliant
trees required
1 5,000 2 2 @ 2"" caliper 0 Yes
2 101P000 4 0 1 tree (24 caliper Yes
inches)
3 15,000 6 2 @ 2"" caliper 1 Maple —15 Yes
caliper inches
1 Fir — 9 caliper
inches.
0
7 Lots developed with detached dwellings in the R-10 and R-14 zoned are exempt from maintaining a minimum number of significant trees onsite,
however they are not exempt from the annual tree removal limits.
8 0r the gross equivalent of caliper inches provided by one (1) or more trees.
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C:\Users\Craig K\DownloadATree Retention WorksheetdocRev: D812015