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DEPARTMENT OF COMMUNITY i CITY OF
AND ECONOMIC DEVELOPMENT Renton 0
TREE RETENTION WORKSHEET
Planning Division
1055 South Grady Way -Renton, WA 98057
Phone: 425-430-7200 1 www.rentonwa.gov
1.
Total number of trees over 6" diameter', or alder or cottonwood
trees at least 8" in diameter on project site
53
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:
53
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
16
trees
5.
List the number of 6" in diameter, or alder or cottonwood trees
over 8" in diameter that you are proposing5 to retain4:
52
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)
(36)
trees
7.
Multiply line 6 by 12" for number of required replacement inches:
(433)
inches
8.
Proposed size of trees to meet additional planting requirement:
(Minimum 2" caliper trees required for replacement, otherwise enter 0)
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.
Z 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 4-4-1301-17a.
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.
1
H:\CED\Data\Forms-Templates\Self-Help Handouts\Planning\Tree Retention Worksheet.docx
08/2015
Tree Retention Worksheet reflects trees within the project's designated Limit of Work
PERMIT RE —SUBMITTAL
II:11S5I[`110111
SURVEYED:
DESIGNED: VS
DRAWN: C ID
12/2] I CHECKED: vs
1:1t�E�7:�llslll�_�,�Ga
SCALE:
ONE INCH
AT FULL SCALE
IF NOT ONE INCH
SCALE ACCORDINGLY
VERTICAL: NAVD 1988
HORIZONTAL: NAD 1983/1991
DATU M
TREE PROTECTION NOTES:
NOTE: ALL REQUIRED TREE PROTECTION MEASURES MUST BE INSTALLED AND APPROVED BY ARBORIST
PRIOR TO COMMENCEMENT OF DEMOLITION.
1. INSTALL 3" DEPTH OF COARSE WOOD CHIPS OVER ENTIRE TREE PROTECTION ZONE (TPZ) PRIOR TO
INSTALLING PERIMETER PROTECTION FENCING. WATER GROUND DEEPLY BEFORE PLACING AND KEEP
MULCH MOIST. DO NOT PILE MULCH DIRECTLY AGAINST TRUNK.
2. VEHICULAR MOVEMENT AND HEAVY EQUIPMENT ARE STRICTLY PROHIBITED WITHIN TPZ. PEDESTRIANS
ARE TO BE EXCLUDED EXCEPT AS ABSOLUTELY NECESSARY.
3. CONSTRUCTION STORAGE IS PROHIBITED WITHIN ENTIRE TPZ INCLUDING CONSTRUCTION SUPPLIES,
EQUIPMENT, MATERIALS, STOCKPILES AND DEBRIS.
4. DISPOSAL OF MATERIALS OR FLUIDS OF ANY KIND IS PROHIBITED WITHIN TPZ.
5. CONTRACTOR MUST RETAIN A CERTIFIED ARBORIST TO INSPECT AND PROVIDE SPECIFIC DIRECTION ON
PRUNING BRANCHES AND ROOTS, AND RELATED WATERING, FERTILIZING, BACKFILLING AND MULCHING.
PROTECTION FENCING
6 FT. TALL CHAIN LINK FENCING TO BE PROVIDED AND
MAINTAINED AROUND ENTIRE PERIMETER OF TPZ. 1 %"
STEEL POSTS TO BE ANCHORED IN GROUND EXCEPT OVER
PAVEMENT. KEEP FENCE LOCKED AT ALL TIMES.
PERMISSION OF OWNER'S REP REQUIRED FOR ACCESS
WITHIN TPZ.
LAMINATED TREE PROTECTION SIGNS TO BE WIRED TO
FENCE NO MORE THAN 10' APART WITH TOPS 12" BELOW
TOP OF PANELS. SIGNS TO BE 8 % "X 11" SIZE MINIMUM
WITH TEXT IN LARGE, BOLD FONT, TO READ: "PROTECT
CRITICAL ROOT ZONE AREA. NO ENTRY, SOIL DISTURBANCE,
PARKING, STORAGE OR DUMPING OF MATERIALS IS ALLOWED
WITHIN THIS AREA."
ZONE B
�UTER TP�
ZONE A
— CRZ � DEFINITIONS
TREE PROTECTION ZONE (TPZ): AREA SURROUNDING INDIVIDUAL
TREES OR GROUPS OF TREES TO REMAIN DURING CONSTRUCTION, AND
DEFINED AS FOLLOWS: RADIAL DISTANCE MEASURED FROM THE TRUNK
FACE OF A TREE AT THE RATE OF 1 FOOT OF PROTECTION PER ONE
INCH OF CALIPER SIZE.
CRITICAL ROOT ZONE (CRZ): INNER HALF OF TPZ EXTENDING RADIALLY
FROM TRUNK.
DBH (DIAMETER AT BREAST HEIGHT):TREE DIAMETER MEASURED AT 4.5
FEET ABOVE GROUND.
PLAN
ZONE A (CRITICAL ROOT ZONE — CRZ)
1. NO DISTURBANCE WHATEVER ALLOWED WITHOUT SITE —SPECIFIC ARBORIST INSPECTION AND APPROVAL
OF METHODS TO PREVENT/MINIMIZE ROOT DAMAGE.
2. CUT ROOTS CLEAN. SEVER ROOTS LARGER THAN 2" DIAMETER ONLY AFTER ARBORIST INSPECTS,
APPROVES THEN DIRECTS PRUNING. COVER CUT ENDS TO KEEP MOIST UNTIL BACKFILLED.
3. TUNNELING IS REQUIRED TO INSTALL LINES 3'-0" BELOW GRADE OR DEEPER. HIGH PRESSURE
WATER EXCAVATION IS PROHIBITED WITHIN TOP 3 FT. OF SOIL WHERE ROOTS ARE CONCENTRATED.
ZONE B ,OUTER TPZ
1. EXCAVATION MUST LEAVE AT LEAST 2/3 OF; PZ UNDISTURBED.
2. ALL TRENCHING MUST BE DONE BY HAND Oi. AIR EXCAVATION TOOL. SPOILS NOT TO BE
PILED IN TPZ; BACKFILL IMMEDIATELY. �oll�
TREE PROTECTION
SCALE: ############
R
CITY OF
RENTON
VASOF
Planning/Building/Public Works Dept
R-422137
IN COMPLIANCE WITH CITY OF RENTON STANDARDS
DEVELOPMENT ENGINEERING
Michael Sippo 01/27/2023
LINDBERGH HIGH SCHOOL MODERNIZATION
16426128TH AVE SE
RENTON, WA 98058
TREE INVENTORY SCHEDULE
DATE:
16 SEPT 2022
FIELDBOOK:
PAGE:
DRAWING NO:
T1.10
SHEET: OF:
37 64
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