Villages C P3&4-CS 950519ENGINEERING DEPARTMENT
MEMORANDUM
DATE: May 19, 1995
TO: Mike Hodge, Building Inspector
FROM: Mike Martin, Graduate Engineer'
RE: R -Rap Slope Protection Wall for 941 Parker Dr.
The proposed R -Rap slope protection wall for 941 Parker Dr. (Lot 16 Block A, Villages of
Coppell IIIB) has been reviewed by the Engineering Department. The location of the slope
protection is shown to be constructed on and outside of the 100 year floodplain therefore a
floodplain permit would not be required. It is important to note that according to the
floodplain FIRM map and the City's topographic map, the limits of the floodplain is as
follows:
Measuring from the front property line, 110 feet along the north
property line and 112 feet along the south property line (see
attached sheets).
Also, during and after the construction of the wall no fill or materials should be placed or
stored in the floodplain. If you have any questions feel free to contact me at 304 -3681.
NEW R-RAP WALL
WROUGHT
FENGE (TO RE
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A. The R —Ra slope protection system proposed on this drawing is•a flexible system, and is not intended
to support any horizontal soil loads due to surcharge loads introduced from adjacent constructions
All building loads must be transferred by deep piers or other methods, to soils that are completely
independent of, and not reliant on, the R —Rap system or the soils behind the system.
B. The R —Rap system has been designed to stabilize the existing soils and to protect the soils from
erosion only.
C. All Site Plan dimensions given are for reference only, and shall be field verified by the contractor
prior to construction.
D. Existing piing, sprinkler or drainage systems exposed or disturbed during the work, shall be repaired
to their original condition. Any existing sub — surface drain pipe shall be extended through the new
R —Rap system.
E The main channel of the creek shall remain free of all obstructions during the course of the
construction. The contractor shall take precautions that will minimize sediment entering the stream
channel.
INSTALLATION / MATERIALS
A. All reinforcing steel shall be deformed type bars and conform to ASTM —A 615, Grade 60, placed
as shown.
B. Make all excavations for base bags to existing undisturbed hard clay or stone. All base soil shall be
scarified of all vegetation, leveled and thoroughly compacted prior to placement of the base bags.
C. All backfill shall be clean site fill free of debris, clay lumps and vegetation. Fill shall be placed in
lifts not to exceed 10 inches in depth, wetted to +— 5 percent of optimum, and mechanically
compacted to 90 percent Proctor Density.
D. Upon completion, all disturbed slope above the R —Rap shall be graded smooth and seeded.
D' x Zr x 4 3/4' - FNSH GRADE
RiKAP BAG LAD / r LP -SLOPE
PARALLEL TO
SLOPE
...a.. ur glaucu 611WOul allu SBeuca
D /4'
9-4tAP DAG LAID
PARALLEL TO
SLOPE
FN5H GRADE
LP -SLOPE
(3) *3 X 4REDAR — III I I I
��� III — III
-- FILTER FADRIG
GONT. BEHIND
R -RAP
r4 REDAR 4' -0' LONG 12' O.G.
13'x21'x43/4'R -RAP
DTOSLOPELLEL aG REDAR 3' -0' LONG
IZ'O.G.
- EXTEW FILTER FADRIG
DMEATH TOP BAG ROW
b
0
N
(3) •3 X 7' REDAR
PER DAG
0 - 9UPIE
FILTER FADRIG
GONT. DEHIND
R -RAP
5' -O' TYP.
HARD GLAY OR 5TOrE
DA5E 5OL
*4 REDAR 4' -0' LONG co 12'
•3 REDAR HOOKS
W /GALV. WASHER
(2 PER BAG)
GALE I/2' - 1' -0'
PERPEPJDIGULAR R TO SLOPE
` +K6 REDAR 3' -0' LONG - 12'0.1
-RAP SLOPE PICO F_j'C'Ft0 N DATE:
May 3, 1995
941 PARKER DRIVE DRAWN PAGE BY.
CHECKED BY:
)ppell, Texas j1h.
SHEET NO.
I
i
OF 1 SHEETS