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TREE RETENTION CALCULATIONS
TOTAL NUMBER OF TREES OVER 6" DIAMETER, OR ALDER OR COTTONWOOD TREES 375
AT LEAST 8" IN DIAMETER ON PROJECT SITE:
DEDUCTIONS: CERTAIN TREES ARE EXCLUDED FROM THE RETENTION
CALCULATION:
TREES THAT ARE DEAD, DISEASED, OR DANGEROUS IN BUILDABLE AREA:
68
TREES IN PROPOSED PUBLIC STREETS
54
TREES IN CRITICAL AREAS AND BUFFERS
51
TOTAL NUMBER OF EXCLUDED TREES:
173
375 EXISTING TREES - 173 EXCLUDED TREES =
202 TREES IN BUILDABLE AREA
202 TREES * 30% RETENTION REQUIRED:
61 TREES
TOTAL NUMBER OF TREES REQUIRED TO BE RETAINED:
61
TOTAL NUMBER OF TREES PROPOSED TO BE RETAINED:
25
(TRACT G- 17 TREES, TRACT C- 13 TREES, TRACT A- 2 TREES)
TOTAL NUMBER OF TREES TO BE REPLACED: 36
12 INCHES * 36 REPLACEMENT TREES: 432 INCHES
432 INCHES/ 2 INCH CALIPER REPLACEMENT TREES: 216 REQUIRED
REPLACEMENT
TREES
LEGEND
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TREE IN ROW TO BE REMOVED (TYP.)
OFFSITE TREE WITH CRZ
TO BE RETAINED
OFFSITE TREE WITH
CRZ TO BE REMOVED
UNDERGROUND LOCATOR SERVICE
C% L L BEFORE YOU DI C.1
8/7
TREE IN NGPA AREA TO BE REMOVED (TYP.)
(DUE TO BEING A HAZARD OR IN ROAD ROW)
OFFSITE TREE
TREE TO BE REMOVED
12/1 /22 REVISION - ADDITIONAL REMOVED TREES
TREE TO BE RETAINED
CRITICAL AREA TREE
BUILDING SETBACK
STEEP SLOPE BOUNDARY
SCALE:
0 25
PROPERTY LINE
STREAM/WETLAND AND STEEP SLOPE BUFFER
PROPOSED PUBLIC STREET/RIGHT-OF-WAY
PROTECTION FENCING
1 CONSTRUCTION RECORD DRAWINGS MEM 2/13/24 HHH SURVEYED: SCALE:
GLENN R SPRAGUE P. L. S. A q /
DESIGNED: ~ l V O FED
SHAHLA HOWEV
DRAWN: p
JACOU IQEEFF
ONE INCH
CHECKED: NOSEY SOL OR/0 IF NOT ONEG NCH
N 0. REVISION BY DATE AP P R APPROVED: SCALE ACCORDINGLY
L1105FY' 5 3-0L ORLO P. L A
VERTICAL: NAVD 1988
HORIZONTAL: NAD 1983/1991
DATU M
TREE TO REMAIN IN CRITICAL AREA (TYP.)
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DETAIL: TREE PROTECTION FENCING
NOT TO SCALE DRIPLINE METHOD
PROTECTION MEASURES DURING CONSTRUCTION:
PROTECTION MEASURES IN THIS SUBSECTION SHALL APPLY FOR ALL TREES THAT ARE TO BE
RETAINED ON SITE AND OFFSITE. OFFSITE TREES CONTAINING DRIP LINES THAT ENCROACH
ONTO THE SITE UNDER CONSTRUCTION SHALL BE CONSIDERED PROTECTED TREES UNLESS IT
IS DETERMINED THE ABUTTING PROPERTY OWNER IS IN COMPLIANCE WITH SUBSECTION C OF
THIS SECTION, ALLOWED TREE REMOVAL ACTIVITIES. ALL OF THE FOLLOWING TREE PROTECTION
MEASURES SHALL APPLY:
A. CONSTRUCTION STORAGE PROHIBITED: THE APPLICANT MAY NOT FILL, EXCAVATE, STACK OR
STORE ANY EQUIPMENT, DISPOSE OF ANY MATERIALS, SUPPLIES OR FLUIDS, OPERATE ANY
EQUIPMENT, INSTALL IMPERVIOUS SURFACES, OR COMPACT THE EARTH IN ANY WAY WITHIN
THE AREA DEFINED BY THE DRIP LINE OF ANY TREE TO BE RETAINED.
B. FENCED PROTECTION AREA REQUIRED: PRIOR TO DEVELOPMENT ACTIVITIES THE APPLICANT
SHALL ERECT AND MAINTAIN SIX-FOOT (6) HIGH CHAIN LINK TEMPORARY CONSTRUCTION
FENCING AROUND THE CRITICAL ROOT ZONE OF ALL RETAINED TREES OR AT A DISTANCE
SURROUNDING THE TREE EQUAL TO ONE AND ONE -QUARTER FEET (1-1/4') FOR EVERY ONE
INCH (1") OF TRUNK CALIPER, WHICEVER4 IS GREATER, OR ALONG THE PERIMETER OF A TREE
PROTECTION TRACT. PLACARDS SHALL BE PLACED ON FENCING EVERY FIFTY FEET (50')
INDICATING THE WORDS, "NO TRESPASSING- PROTECTED TREES", OR ON EACH SIDE OF THE
FENCING IF LESS THAN FIFTY FEET (50') . SITE ACCESS TO INDIVIDUALLY PROTECTED TREES OR
GROUPS OF TREES SHALL BE FENCED AND SIGNED. INDIVIDUAL TREES SHALL BE FENCED ON
FOUR (4) SIDES. IN ADDITION, THE APPLICANT SHALL PROVIDE SUPERVISION WHENEVER
EQUIPMENT TOR TRUCKS ARE MOVING NEAR TREES.
C. PROTECTION FROM GRADE CHANGES: IF THE GRADE LEVEL ADJOINING TO A TREE TO BE
RETAINED IS TO BE RAISED, THE APPLICANT SHALL CONSTRUCT A DRY ROCK WALL OR ROCK
WELL AROUND THE TREE. THE DIAMETER OF THIS WALL OR WELL MUST BE EQUAL TO THE
TREE'S DRIP LINE.
D. IMPERVIOUS SURFACES PROHIBITED WITHIN THE DRIP LINE: THE APPLICANT MAY NOT
INSTALL IMPERVIOUS SURFACE MATERIAL WITHIN THE AREA DEFINED BY THE DRIP LINE OF
ANY TREE TO BE RETAINED, UNLESS OTHERWISE APPROVED BY THE CITY (ORD. 5958,
12-9-2019)
E. RESTRICTION ON GRADING WITHIN THE DRIP LINES OF RETAINED TREES: THE GRADE LEVEL
AROUND ANY TREE TO BE RETAINED MAY NOT BE LOWERED WITHIN THE GREATER OF THE
FOLLOWING AREAS: (1) THE AREA DEFINED BY THE DRIP LINE OF THE TREE, OR (11) AN AREA
AROUND THE TREE EQUAL TO ONE AND ONE-HALF (1-1/2') IN DIAMETER FOR EACH ONE INCH
(1") OF TREE CALIPER. A LARGER TREE PROTECTION ZONE BASED ON THE TREE SIZE, SPECIES,
SOIL, OR OTHER CONDITIONS MAY BE REQUIRED. (ORD. 5676, 12-3-2012)
F. MULCH LAYER REQUIRED: ALL AREAS WITHIN THE REQUIRED FENCING SHALL BE COVERED
COMPLETELY AND EVENLY WITH A MINIMUM OF THREE INCHES (3") OF BARK MULCH PRIOR TO
INSTALLATION OF THE PROTECTIVE FENCING. EXCEPTIONS MAY BE APPROVED IF THE MULCH
WILL ADVERSELY AFFECT PROTECTED GROUND COVER PLANTS. (ORD. 5676, 12-3-2012)
G. MONITORING REQUIRED DURING CONSTRUCTION: THE APPLICANT SHALL RETAIN A
CERTIFIED ARBORIST OR LICENSED LANDSCAPE ARCHITECT TO ENSURE TREES ARE PROTECTED
FROM DEVELOPMENT ACTIVITIES AND/OR TO PRUNE BRANCHES AND ROOTS, FERTILIZER, AND
WATER AS APPROPRIATE FOR ANY TREES AND GROUND COVER THAT ARE TO BE RETAINED.
H. ALTERNATIVE PROTECTION: ALTERNATIVE SAFECUARDS MAY BE USED IF DETERMINED TO
PROVIDE EQUAL OR GREATER TREE PROTECTION. (ORD. 5676, 12-3-2012; ORD.
5841-6-12-2017)
NOTES
• FOR MORE DETAILED INFORMATION REGARDING THE TREES, PLEASE SEE ARBORIST
REPORT BY WASHINGTON FORESTRY CONSULTANTS, INC.
• DEAD TREES ARE NOT SHOWN ON THIS PLAN. PLEASE, SEE THE ARBORIST REPORT FOR
REFERENCE.
CIVIL ENGINEERING
LANDSCAPE ARCHITECTURE
PLANNING
SURVEYING
Bothell, Washington 98077 425.885.7877
R-417951
IN COMPLIANCE WITH CITY OF RENTON STANDARDS
DATE:
• C CANOPY 2115124
C T Y 0 4196 LINCOLNAVENE, RENTON, WA 98056 FIELDBOOK:
RENTON PAGE:
Namir
DRAWING N0:
Planning/Building/Public Works Dept. TREE RETENTION PLAN LZ.OZ
SHEET: OF:
6,3 10/
CONSTRUCT/ON RECORD DRA WINGS
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