For Reference-BLD2023-0072+Retaining Wall+1.20.2023_3.25.05_PM+3326026DESIGN NOTES:
Reference: RAM Engineering, Inc., Clearing, Grading & TESC Plan
The following design assumptions were used:
Internal angle of friction for reinforced soil = 32 degrees (design only - see Material
Note "F")
Unit weight of reinforced soil = 125 pcf
Maximum wall height = 17.33 feet
Batter of wall = 1 H : 10V
Surcharge = Footing Load or Traffic Surcharge
TECHNICAL SPECIFICATIONS FOR MECHANICALLY STABILIZED LOCK & LOAD
RETAINING WALLS
GENERAL:
A. The work involves the supply and installation of soil reinforced retaining walls. The
Concrete Panels and Counterforts will consist of Lock & Load Stone. Counterfort and
Geogrid are the types of soil reinforcement. The work will include, but is not limited
to:
A-1 excavation to the grades shown on the civil drawings
A-2 supply and installation of geogrid reinforcement
A-3 supply and installation of drainage fill and piping
A-4 supply and installation of segmental Lock & Load Stones
A-5 supply and installation of retained and reinforced soil fill
B. The walls shall be installed on undisturbed Native Soils or Structural Fill, as
appropriate.
MATERIALS
A. Concrete Panels and Counterforts are locked together to form a "Stone". The
retaining walls have been designed on the basis of Lock & Load Retaining Wall
"Stones". Stones are to be purchased from a licensed Lock & Load manufacturer.
The Lock & Load trademark on each pallet identifies Lock & Load products.
B. Information on the purchase of Lock & Load products can be obtained through:
Lock & Load Retaining Walls Ltd.
Tel. (604) 732-9990
Website: www.lock-load.com
C. Geogrid - See Geogrid Schedule.
D. Drainage Fill - Drainage Fill placed around and above the perforated drainage pipe
shall consist of clean aggregate between 3/4 inch and 1 1/2 inch.
E. Face Gravel - 3/4 inch to 1 inch Clean Crushed Rock, no fines. Face Gravel shall be
compacted thoroughly to ensure no settlement of panels.
F. Reinforced Backfill - Suitable granular material approved by the Geotechnical Engineer.
G. Leveling Pad - The Leveling Pad shall consist of angular, crushed aggregate of
maximum size of 3/4 inch. The Leveling Pad Fill may be single size or may be well
graded containing a maximum of 5% passing the #200 sieve.
EXECUTION
A. Contractor shall excavate to the lines and grades shown on the construction drawings.
The Geotechnical Engineer should observe the excavation prior to the placement of
the leveling material or fill soils.
B. Over -excavation of deleterious soils or rock shall be replaced with material meeting
the specifications described in the section "Material G" above, and compacted to 95%
of ASTM D-1557-91 (Modified Proctor) within 2% of the optimum moisture content
of the soil.
C. The first course of concrete Lock & Load Stones shall be placed on the Leveling Pad
and the alignment and level checked.
D. Stones shall be placed with the top of the panel level and parallel to the wall face.
The Counterfort Base installs horizontal and perpendicular to the face of the retaining
wall.
E. Geogrid shall be oriented with the highest strength axis perpendicular to the wall
alignment.
F. Geogrid reinforcement shall be placed at the levels and to the lengths shown on the
drawings beginning at the back of the Lock & Load Panels.
G. The geogrid shall be laid horizontally in the direction perpendicular to the face of the
retaining wall. The geogrid shall be pulled taut, free of wrinkles and anchored prior to
backfill placement on the geogrid.
H. The geogrid reinforcement shall be continuous throughout their embedment lengths.
Spliced connection between shorter pieces of geogrid is not permitted.
I. The drainage pipe discharge points shall be connected to approved discharge.
J. Reinforced and Retained Backfill shall be placed, spread and compacted in such a
manner that minimizes the development of slack in the geogrid.
K. Reinforced and Retained Backfill shall be placed and compacted in lifts not to
exceed 8 inches where hand compaction equipment is used and not more than 12 inches
where heavy compaction equipment is used. FIRST - compact over tail of Counterfort
then away from the retaining wall structure. Hand operated compaction equipment
(700 lb. to 1,000 lb.) Vibratory Plate shall be used to compact face gravel at wall face.
L. Reinforced and Retained Backfill shall be compacted to 95% of the maximum density
as determined by ASTM D-1557-91 (Modified Proctor) or equivalent. The moisture
content of the backfill material prior to and during compaction shall be uniformly
distributed throughout each layer and shall be within 2 percentage points of the
optimum moisture content.
M. Hand -operated equipment (700 lb. to 1,000 lb. Vibratory Plate) shall be used within
26 inches of the front face of the concrete facing.
N. Tracked construction equipment shall not be operated directly upon the geogrid
reinforcement. A minimum fill thickness of 6 inches is required prior to operation of
tracked vehicles over the geogrid.
O. Rubber tired equipment may pass over the geogrid reinforcement at slow speeds
less than 5 mph. Sudden braking and sharp turning shall be avoided.
P. At the end of each day of operation, the contractor shall slope the last lift of
reinforced backfill away from the wall units to direct runoff away from the wall face.
The contractor shall not allow surface runoff from adjacent areas to enter the wall
construction site.
Chain Link < Fence Post (By Others)
Fence
Embedded in Sleeve,
or Guardrail
1" Min. Clearance Each Side
6' - 0,, As Required
of Post
Max.
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To Face of Top Block
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Retained
Face Gravel (See Materials
SOi1S
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NOTE: Wall Toe Backfill ° 4" Perforated Drainpipe
D
must be placed during or immediately
12 (Min.) III —III
Surround with 1 cf of
I I
after Wall Construction.
III
=III —
— � � Washed Rock per lineal foot
— — of Pipe NOTE: Geotechnical Engineer shall
2" - 4" Leveling Pad
Competent Subgrade
evaluate the need for Supplementary
(See Materials Note G)
(Geotechnical Engineer to Confirm)
Drainage behind the Reinforcement
Zone during Construction.
STRUCTURAL FILL
GRAVITY WALL CONDITION
(4 Foot Max. Height)
NOT - TO - SCALE
Fence Post (By Others)
Embedded in Sleeve,
Chain Link N1" min. Clearance Each Side
�P`
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of Post
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NOTE: Wall Toe Backfill
must be placed during or immediately
: ': 4" Perforated Drainpipe
after Wall Construction.
III —III =
2" - 4" Crushed
Rock Competent Subgrade
Leveling
Course (Geotechnical Engineer to Confirm)
NATIVE CUT
GRAVITY WALL CONDITION
(5.33 Foot Max. Height)
NOT - TO - SCALE
Fence Post (By Others)
Chain Link *
-0— Embedded in Sleeve,
Fenced
1" Min. Clearance Each Side i
or Guardrail
of Post
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SE 1/4 SEC 31, TWP 27 N, RGE 4E, W.M.
2'- 6"
Geogrid Length —
Min.
° ° ° (See Geogrid Schedule)
=
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I Soils
24" Mina
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Note F)
° °°°
Drainage Blanket
*Embedment shall be 24" minimum
1
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NOTE: Geotechnical Engineer shall
:.` 4" Perforated Drainpipe
r immBackfiediately
must be placed during or immediately
evaluate the need for Supplementary
_ — Surround with 1 cf of
after Wall Construction. III —III
Drainage behind the Reinforcement
=III —
— Washed Rock per lineal foot
Zone during Construction.
III = — of Pipe
2" - 4" Leveling Pad
(See Materials Note G) Competent Subgrade
(Geotechnical Engineer to Confirm)
TYPICAL WALL SECTION
NOT - TO - SCALE
NOTE: Wall Alignment and Heights To Be
Established By Contractor / Surveyor.
GEOGRID SCHEDULE
Wall
Height
Geogrid
Length
MMMEMOMMEMEMM
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27"
C..
GEOGRID: A = Miragrid 5XT
B = Miragrid 7XT
C = Miragrid 10XT
SIDE VIEW
z 7.65"
X 4"
LL
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27"
00° 91 "
4.4" 80
90
20.4"
REINFORCEMENT BAR
BENDING DETAIL
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NOTES:
1. Installation to be completed in accordance with manufacturer's
specifications.
2. Do not scale from drawings.
LOCK & LOAD COUNTERFORT
NOT - TO - SCALE
FRONT VIEW
TOP VIEW
Outline of
Connecting Loop
16"
c
Poly Fiber Reinforced
1 1/2" fiber (4#/yd.)
6,000 psi concrete
Casting Tolerance SIDE VI
NOTES:
1. Installation to be completed in accordance with manufacturers
specifications.
2. Do not scale from drawings.
LOCK & LOAD PANEL
NOT - TO - SCALE
APPROVED FOR CONSTRUCTION
CITY OF EDMONDS
DATE:
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W1
SPECIFICATIONS:
MODULAR BLOCK WALL CONSTRUCTION
GENERAL
A. Work shall consist of furnishing and construction of a Modular Block Retaining
Wall System or equal in accordance with these specifications and in reasonably close
conformity with the lines, grades, and dimensions shown on the plans.
B. Work includes preparing foundation soil, furnishing and installing leveling pads, drainage
fill and backfill to the lines and grades shown on the construction drawings.
C. Work includes furnishing and installing geogrid soil reinforcement of the type, size,
location, and lengths designated on the construction drawings.
D. Contractor shall submit a Manufacturer's certification, prior to start of work, that the
retaining wall system components meet the requirements of this specification and the
structure design.
E. Owner shall provide soil testing and quality assurance inspection during earthwork and
wall construction operations. Owner's quality assurance program does not relieve the
contractor of responsibility for wall performance.
DELIVERY, STORAGE AND HANDLING
A. Contractor shall check all materials upon delivery to assure that the proper type, grade,
color, and certification has been received.
B. Contractor shall protect all materials from damage due to jobsite conditions and in
accordance with manufacturer's recommendations. Damaged materials shall not be
incorporated into the work.
PRODUCTS
DEFINITIONS
A. Modular Unit: a concrete retaining wall element, machine made from Portland Cement,
water, and aggregates.
B. Structural Geogrid: a structural element formed by a regular network of integrally
connected tensile elements with apertures of sufficient size to allow interlocking with
surrounding soil, rock, or earth and function primarily as reinforcement.
C. Unit Drainage Fill: drainage aggregate which is placed within and immediately behind
the modular concrete units.
D. Reinforced Backfill: compacted soil which is placed within the reinforced soil volume as
outlined on the plans.
MODULAR CONCRETE RETAINING WALL UNITS
A. Modular Concrete Units shall conform to the following architectural requirements:
bond configuration: running with bonds nominally located at midpoint vertically adjacent
units, in both straight and curved alignments.
B. Modular concrete materials shall conform to the requirements of ASTM C1372 -
Standard Specifications for Segmental Retaining Wall Units.
C. Modular concrete units shall conform to the following structural and geometric
requirements measured in accordance with appropriate references:
compressive strength = 3000 psi minimum
absorption = 8% maximum (6% in northwestern states) for standard weight aggregates
dimensional tolerances = +1/8" from nominal unit dimensions not including rough split
face, ±1/16" unit height - top and bottom planes
unit size = 75 lb. / unit
inter -unit shear strength = 1500 plf minimum at 2 psi normal pressure
geogrid/unit peak connection strength = 1000 plf minimum at 2 psi normal force
D. Modular concrete units shall conform to the following constructability requirements:
vertical setback = 6 - 12 Degree Batter
alignment and grid positioning mechanism - connecting lugs
maximum horizontal gap between erected units shall be - 1/2 inch
BASE LEVELING PAD MATERIAL
A. Material shall consist of a compacted clean crushed rock base or non -reinforced
concrete as shown on the construction drawings.
UNIT DRAINAGE FILL
A. Unit Drainage Fill shall consist of clean 1" crushed rock meeting the following
gradation tested in accordance with ASTM D-422:
Sieve Size Percent Passing
1 inch 100
3/4 inch 75-100
No.4 0-10
B. Drainage Fill shall be placed within cores of, between, and behind units a minimum
distance of 12" as shown on the plans.
REINFORCED BACKFILL
A. Reinforced Backfill shall be free of debris and consist of a suitable granular material
approved by the Geotechnical Engineer.
B. Unsuitable soils for backfill (high plastic clays or organic soils) shall not be used in the
backfill or in the reinforced soil mass.
C. Contractor shall submit reinforced fill sample and laboratory test results to the
Geotechnical Engineer for approval prior to the use of any reinforced fill material.
GEOGRID SOIL REINFORCEMENT
A. Geosynthetic reinforcement shall consist of geogrids manufactured specifically for soil
reinforcement applications and shall be manufactured from high tenacity polyester yarn
or high density polyethylene. Polyester geogrid shall be knitted from high tenacity
polyester filament yarn with a molecular weight exceeding 25,000 meg/m and a carboxyl
end group values less than 30. Polyester geogrid shall be coated with an impregnated
PVC coating that resists peeling, cracking, and stripping.
B. Long Term Design Strength of the geogrid material shall be at least 2,575 Ibs/ft.
(Miragrid 5XT or equivalent)
C. Manufacturing Quality Control
The geogrid manufacturer shall have a manufacturing quality control program that
includes QC testing by an independent laboratory.
The QC testing shall include:
Tensile Strength Testing
Melt Flow Index (HDPE)
Molecular Weight (Polyester)
DRAINAGE PIPE
A. The drainage pipe shall be rigid perforated PVC pipe manufactured in accordance
with ASTM D-3034.
EXECUTION
EXCAVATION
A. Contractor shall excavate to the lines and grades shown on the construction drawings.
The Geotechnical Engineer shall observe the excavation and approve prior to placement
of leveling material or fill soils. Proof roll foundation area as recommended by the
Geotechnical Engineer to determine if remedial work is required.
B. Over -excavation and replacement of unsuitable foundation soils and replacement with
approved compacted fill will be compensated as agreed upon with the Owner.
BASE LEVELING PAD
A. Leveling Pad material shall be placed to the lines and grades shown on the construction
drawings, to a minimum thickness of 6 inches and extended laterally a minimum of 4" in
front and behind the modular wall unit.
B. Soil leveling pad materials shall be compacted to a minimum of 95% Modified Proctor
density per ASTM D-1557-91.
C. Leveling Pad shall be prepared to ensure full contact to the base surface of the concrete
units.
MODULAR UNIT INSTALLATION
A. First course of units shall be placed on the leveling pad at the appropriate line and
grade. Alignment and level shall be checked in all directions and insure that all units are
in full contact with the base and properly seated.
B. Place the front units side -by -side. Do not leave gaps between adjacent units. Layout
of corners and curves shall be in accordance with manufacturer's recommendations.
C. Wall batter shall be 1 H : 12V min.
D. Place and compact drainage fill within and behind wall units. Place and compact backfill
soil behind drainage fill. Follow wall erection and drainage fill closely with structural
backfill.
E. Maximum stacked vertical height of wall units, prior to unit drainage fill and backfill
placement and compaction, shall not exceed two courses.
STRUCTURAL GEOGRID INSTALLATION
A. Geogrid shall be oriented with the highest strength axis perpendicular to the wall
alignment.
B. Geogrid reinforcement shall be placed at the strengths, lengths, and elevations shown on
the construction design drawings or as directed by the Engineer.
C. The geogrid shall be laid horizontally on compacted backfill and attached to the modular
wall units. Place the next course of modular concrete units over the geogrid. The
geogrid shall be pulled taut, and anchored prior to backfill placement on the geogrid.
D. Geogrid reinforcements shall be continuous throughout their embedment lengths and
placed side -by -side to provide 100% coverage at each level. Spliced connections
between shorter pieces of geogrid or gaps between adjacent pieces of geogrid are not
permitted.
REINFORCED BACKFILL PLACEMENT
A. Reinforced backfill shall be placed, spread, and compacted in such a manner that
minimizes the development of slack in the geogrid and installation damage.
B. Reinforced backfill shall be placed and compacted in lifts not to exceed 6 inches where
hand compaction is used, or 8 - 10 inches where heavy compaction equipment is used.
Lift thickness shall be decreased to achieve the required density.
C. Reinforced backfill shall be compacted to 95% of the maximum density as determined
by ASTM D-1557-91. The moisture content of the backfill material prior to and during
compaction shall be at or near the optimum moisture content.
D. Only lightweight hand -operated equipment shall be allowed within 3 feet from the tail of
the modular concrete unit.
SE 1/4, SEC 31, TWP 27N, RGE 4E, W.M.
E. Tracked construction equipment shall not be operated directly upon the geogrid
reinforcement. A minimum fill thickness of 6 inches is required prior to operation of
tracked vehicles over the geogrid. Tracked vehicle turning should be kept to a minimum
to prevent tracks from displacing the fill and damaging the geogrid.
F. Rubber tired equipment may pass over geogrid reinforcement at slow speeds, less than
10 MPH. Sudden braking and sharp turning shall be avoided.
G. At the end of each day's operation, the Contractor shall slope the last lift of reinforced
backfill away from the wall units to direct runoff away from wall face. The Contractor
shall not allow surface runoff from adjacent areas to enter the wall construction site.
CAP INSTALLATION
A. Cap units shall be glued to underlying units with an all-weather adhesive or as recommended
by the manufacturer.
AS -BUILT CONSTRUCTION TOLERANCES
A. Vertical alignment: ±1.5" over any 10' distance
B. Wall Batter: within 2 degrees of design batter
C. Horizontal alignment: +1.5" over any 10' distance
Corners, bends, curves +1 ft. to theoretical location
D. Maximum horizontal gap between erected units shall be 1/2 inch
FIELD QUALITY CONTROL
A. The wall construction shall be observed by the Geotechnical Engineer on a full time
basis. Testing of the compacted backfill shall be performed by the Geotechnical
Engineer.
B. As a minimum, quality assurance shall include foundation soil inspection, soil and
backfill testing, verification of design parameters, and observation of construction for
general compliance with design drawings and specifications.
4' Chain Link Fence
By Others 1
(As Required per Plans)
4' Chain Link Fence
By Others
(As Required per Plans)
Modular Block
(12" Min.)
Wall Height H
4' Max.
Footing Setback
5' Min.
To Face of Top Block
12"
Min.
Competent Cut
I
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or Structural
Fill
Unit Drainage Fill
Clean Crushed Rock)
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NOTE: Wall Toe Backfill R
must be placed during or immediately \ 4" Diameter Perforated PVC
after Wall Construction 2" - 4" Leveling Pad Competent Subgrade
Drain Pipe
(Crushed Rock) (Geotechnical Engineer to Confirm)
GRAVITY WALL
CONDITION
Footing Setback
5' Min.
To Face of Top Block
Modular Block
(12" Min.)
12"
Min. '
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a it a i a Geogrid Layer 1
for sloped toe condition.
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NOTE: Wall Toe Backfill
must be placed during or immediately
4" Diameter Perforated PVC
after Wall Construction.
2" - 4" Leveling Pad
Drain Pipe
(Crushed Rock)
Competent Subgrade
(Geotechnical Engineer to Confirm)
TYPICAL MODULAR BLOCK
WALL DETAIL
Not - To - Scale
Not - To - Scale
APPROVED FOR CONSTRUCTION
CITY OF EDMONDS
DATE:
BY.•
CITY ENGINEERING DIVISION
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W2
NOTES:
Rockery construction is a craft. The skill and experience of the builder will largely dictate
the success of the construction.
SE 1/4, SEC 31, TWP 27N, RGE 4E, W.M.
A rockery is a protective system with respect to the weathering and erosion process
on an exposed soil face.
Maximum inclination of the slopes above and in front of rockeries should be 2 : 1 (horizontal
vertical).
Minimum thickness of rock filter layer = 18 inches.
Rockeries greater than 6 feet in height should be installed under the observation of the
Geotechnical Engineer.
The long dimension of the rocks should extend back towards the cut or fill face to provide
maximum stability.
Rocks should be placed to avoid continuous joint planes in vertical or lateral directions.
Each rock should bear on two or more rocks below it, with good flat -to -flat contact.
Rock designations and approximate weights are provided below.
Size
Approximate
Weight - lbs.
Approximate
Diameter
1 Man
50 - 200
12" - 18"
2 Man
200 - 700
18" - 28"
3 Man
700 - 2000
28" - 36"
4 Man
2000 - 4000
36" - 48"
5 Man
4000 - 6000
48" - 54"
6 Man
6000 - 8000
54" - 60"
NATIVE CUT ROCKERY
A. The Geotechnical Engineer shall observe cuts for the rockery. Additional flattening
of cuts may be recommended by the Geotechnical Engineer depending on the soil
and groundwater conditions observed. Where Native Cuts do not expose competent
Native Soils, additional excavation and the addition of reinforcement and Compacted
Structural Fill may be necessary.
FIELD QUALITY CONTROL
A. The rockery construction shall be observed by the Geotechnical Engineer on a periodic or
full-time basis as appropriate. Testing of the compacted backfill shall be performed by
the Geotechnical Engineer.
B. Quality assurance shall include foundation soil inspection, soil and backfill testing,
verification of design parameters and observation of construction for general compliance
with design drawings and specifications.
Wood or Chain Link
Fence (As Required)
c
NOTE: Fence Support Posts located
in close proximity to back of Rockery
shall be entirely embedded
in Filter Drain Rock (Quarry Spalls).
Guardrail Supports shall be evaluated <
separately.
\_ ° 0° °
Y ° °
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o
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Upper One -Third — — k Q o /
�°° o
2 Man Rock 6 ° ° o o 10 ° 18" of 2" to 4"
�° Oo7 0 Filter Drain Rock ,
° o ° °o°° ° Extend along entire height
o °00 ° 0°° ° of Rockery ,
H \\ / i ° ° OO° 0 ° ° a 1
° °
Height = 10' Max. 00 ° o°o ° o o / 1
0
0 ° o9°oo 00° / Cut for rockery shall maintain a minimum
Middle One Third
0 Native Cut , / 1 H : 1 V setback from other structures.
3 & 4 Man Rock i °OO°°°n 00 °
/ ° o 0° °
° b o ° /
00 0 °o° ° /
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00
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Lower One -Third ` '� _ _ _ �' ° o a0 0 o °0 o /
5&6Man Rock —r' °� �0
12" Min. o ° ° CD° Dense Native Soil*
° ° °
o
° o
NOTE: Wall Toe Backfill °°
must be placed during or immediately
after Wall Construction.
° ° °°
° ° ° o / (Geotechnical Engineer
CD
0 o/ to Confirm)
— -- °0 o o Bo o og
o
°
Competent Native Subgrade 4" Dia. Rigid Perforated
(Geotechnical Engineer to Confirm) PVC Drain Pipe
NATIVE CUT ROCKERY
DETAIL*
NOT - TO - SCALE
* NOTE: Cut stability shall be evaluated
by ESNW to confirm viability of native cut
rockery conditions.
APPROVED FOR CONSTRUCTION
CITY OF EDMONDS
DATE:
BY.•
CITY ENGINEERING DIVISION
of wASyR/Cy
z
53803
�� '�E�ISTERF.�
�sS10 NA L
02/04/2022
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Sheet No.
W3