SWA000167_Plansheet - SCM Detail_20220912

3 6 " RC;
ice-
\ 20' PRIVATE \
\ \ \ STORMWATER
\ \ EASEMENT
\ \ \ \ \ \
RCP \ I \ \ \ \ \ \ \ \ \ \ \ \ \
1/:B 201
P^4WA
!69
141
IN
395 39!
390
350
1
\ I I
1' THICK RETAINING WALL �
TO BE DESIGNED BY OTHERS
CM 1 RISER (4X4)
OP 368.00
JV IN 365.90 (8' RISER ORFICE )
INV IN 365.02 WQE ORIFICE)
INV IN 359.00 ( " DRAWDOWN)
qV IN 365.90 ' RISER ORIFICE)
JV OUT 359.00 (TO SCM 1 FES)
EXISTING GRADE � \
PROPOSED GRADE \
w
100 YR WATER ELEV = 368.92' ^
25 YR WATER E�_368.16_
-10 YR WATER ELEV = 367.41' -
36'n 1 YR WATER ELEV = 366.03'
oR��csOoA - -- ---- \
WOV ELEV = 365.04'
sk^�� PERMANENT POOL ELEV = 364.00' �' \
c \2.5" WOE DRAWDOWN
EI EV: 364.00'
MIN. 2'-
TOP 367.33
INV IN 334.00 (100-101)
VELOCITY BOTTOM OF FOREBAY
DISSIPATER PAD ELEV = 361.00'
BOTTOM OF
SEDIMENT STORAGE
ELEV = 358.00'
BOTTOM OF MAIN
POND ELEV = 359.00'
6" MAINTENANCE
DRAWDOWN PIPE
ELEV: 359.00'
c•11
;'m1
3751
TOP OF BERM
ELEV = 370.00'
SPILLWAY
ELEV = 369.00' 370
(2) 8" ORIFICE FILTER DIAPHRAM (SEE
ELEV: 365.90' DETAIL ON SHEET 6.1)
SCM 1 FES
TOP 360.10 365
INV IN 357.56 (SCM 1
d. I i- ,, `3?nut �u� ��v d,
co N N O 07 � 07 QD CO
MCD M� co� Mco MM MM CS (0 co
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L VELOCITY 355
DISSIPATER PAD
24" RCP
@ 1.81 %
O-RING �ASKETED
350
-0+50 0+00 1+00 2+00 3+00 4+00
SCM 1 PROFILE
HORIZ SCALE: 1 "=30'
VERT SCALE: 1 "=3
3451
UTFALL)
4+50
3
Top of Riser
368.00 ft
2.50 inch
Water Quality
Orifice
364.00 ft
0 30
PROFILE SCALE
Hand Wheel
VEGETATIVE SHELF
PLANTING PLAN LEGEND
QUAIL SEDGE
44444 (CEREZ TENERA)
VIRGINIA SWEETSPIRE
/ (ITEA VIRGINICA)
D p D D JOE PYE WEED
D D (EUPAT' FISTULOSUS)
SCALE 1 "=30'
1 NOR
0 30' 60'
2 Yr Water Surf Elev: 366.23 ft
1 Yr Water _Surf Elev: _ _ 365.97 ft
Temp Pool Elev_365.04 ft
Perm Pool 364.00 ft
4.00 ft
5.00 ft---- 79.52 LF of
24" RCP @ 1.81 %
6" PVC Invert Out: 359.00 ft
Fill With Concrete ,
As Necessary
359.00 ft
Precast Extended Base ;
1.00 ft 358.00 ft
1 --
2.00 ft 2.00 ft
PRECAST CONCRETE RISER
4 ft x 4 ft x 10 ft Tall, With a 1 ft Thick Precast
Extended Base
1" Water Quality Runoff . - Calculation
Using the runoff volume calculations in the "Simple Method" as described by Schueler (1987)
Where:
Rv = Runoff Coefficient, in/in
I = Percent Impervious
1= 51.1 %
Rv = 0.05 + 0.009(I)
Rv = 0.510
1.0 inch runoff volume (Required)
Runoff volume, S=(Design rainfall) (RV) (Drainage Area)
Design Rainfall =
1.0 inch
Drainage Area =
15.60 acres
Storage Required =
28,856 cu. ft.
Volume• • - For 1.0"•
Depth PPE SA (SF)
• •ve Permanent Pool• •-•
Top Temp Pool SA (SF) Volume (CF) Elevation
1.00 21,442
33,858 28,856 365.00
Size Water Quality Orifice
Qv = CdA 2 h 1/2
for• • for •Volume
(Orifice Equation-, Cd=0.60; h = Ho/3)
2.50 1Orifice
Diameter (inches)
0.90
Ho (Driving Head to Centroid of Orifice) (ft)
0.30
Ho / 3 (Per orifice equation recommendation in NCDEQ SWM Design Manual, Part
0.09
Q1.0" Drawdown Rate (cfs)
28,856
Water Quality Volume (V
VW / Q1" x 86,400
Drawdown Time (days)
3.7
Pond
Pond Type
Drawdown Time (days) (2 - 5 days)
. Elevations
Wet Pond
TSS Removal
850%
Top of Pond / Berm
370.0 ft
Secondary Spillway Width
50.00 ft
Bottom of Secondary Spillway
369.00 ft
Top of Riser
368.00 ft (at least 1' Above TPE)
Riser Type / Size
44 ft
Top of Water Quality / Temp Pool Elev
365.04 ft (1" Runoff)
Top of Veg. Shelf
365.00 ft
Permanent Pool Elevation (Normal Pool)
364.00 ft
Water Quality Orifice Elevation & Size
364.00 ft 2.50 in
Secondary Orifice Elevation & Size (Rise & Span)
365.9 ft (2) Total 8.00 inch 8.00 inch
Bottom of Veg. Shelf
364.00 ft A Rise A Span
Top of Sediment Storage / Pond Bottom
359.00 ft
Bottom of Sediment Storage
358.00 ft (Min 1 ft)
Invert Out of Riser
359.00 ft
Outlet Pipe Size
24.00 in Diameter RCP
Outlet Pipe Length & Slope
79.52 ft 1.81 %
Downstream Outlet Elevation
357.56 ft
1 Yr Water Surface Elev/ Peak Flow (CFS)
365.97 ft 0.27 CFS
2 Yr Water Surface Elev Peak Flow (CFS)
366.23 ft 0.91 CFS
10 Yr Water Surface Elev Peak Flow (CFS)
367.11 ft 3.44 CFS
25 Yr Water Surface Elev Peak Flow (CFS)
367.81 ft 4.54 CFS
100 Yr Water Surface Elev Peak Flow (CFS)
Top of Riser: 368.00
Top of WQ Pool: 365.04
Pond Bottom
359.00
Perm Pool Sediment Bottom
364.00 358.00
Anti-Bouyancy
Riser Dimensions
368.48 ft 22.79 CFS
'. • Detail
2.5 in WQ Orifice Elev
364.00 10' Berm 370.00
100 Yr 368.48
Spillway 369.00
25 Yr 367.81
10 Yr 367.11
2 Yr 366.23
1 Yr 365.97
See Plan for
accurate outlet design
Inv Out:
357.56
• ' .
Invert Out: 359.00 79.52 LF of 24" RCP @
Base: 358.00 1.81%
Calculationsfor
Weight of Structure Displaced Volume
Outside Width 5.00 ft
Walls =
13,500 LBS
V = LxWx(HT) = C.F.
Inside Width 4.00 ft
Base =
12,150 LBS
Outside Length 5.00 ft
FILL =
0 Ibs
Displaced Water =
Inside Length 4.00 ft
C.F. * 62.4 PCF = LBS
Height 10.00 ft
Outlet Pipe =
236 LBS
Base Thick' (ft) 1.00 ft
WQ Orifice =
3 LBS
Add 15% Factor of Safety
Wall Thick' (ft) 0.50 ft
Ext Base (ft) 2.00 ft
Weir #1 =
66.66666667 LBS
V = 275 C.F.
Areas removed from Riser
Weir #2 =
0 LBS
Disp. Water = 17,160 LBS
Outlet Pipe 3.14 ft
Weir #3 =
0 LBS
15% F.S. = 2,574 LBS
WQ Orifice 0.03 ft
Weir #4 =
0 LBS
Orifice #1 0.89 ft
Other #1 =
0 LBS
Safety Factor 1.28
Orifice #2 0.00 ft
Orifice #3 0.00 ft
Weight =
25,345 LBS
Weight = 19,734 LBS
Orifice #4 0.00 ft Precast Concrete Riser Structure to be 4 ft x 4 ft x 10 ft Tall, With a 1 ft Thick Precast
Other 0.00 ft Extended Base
Planting Summary Requirements
Dam / Berm Non -Clumping Turf Grass
6' Shelf Length 889 Area of Shelf= 5334 SF (50 Plants per 200 SF of Area)
Quantity Type Root
Common Name Scientific Name Planting Size Notes
Herbaceous Container
Quill Sedge CerexTenera 4" Pot 24"-36"OC
-- . Herbaceous Container
Virginia Sweetspire Itea Virginica 4" Pot 24"-36" OC
- = Herbaceous Container
Joe Pye Weed Eupat' Fistulosus 4" Pot 24"-36" OC
100 Yr Flow in Spillway 0.00 cfs
10 Yr Flow in Spillway 0.00 cfs
Top of Pond 370.00
ALL CONSTRUCTION TO BE IN ACCORDANCE
WITH ALL TOWN OF YOUNGSVILLE, FRANKLIN
COUNTY, NCDEQ AND NCDOT STANDARDS,
SPECIFICATIONS, AND DETAILS
4:1 Side Slopes
58 ft
50 ft
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DATE
0811912022
DRAWN BY
331
DESIGNED BY
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CHECKED BY
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DocuSign Envelope ID: DE2365E9-58D3-46A3-9FBB-38D8D23A6B95
LIMITS OF
CONCRETE
CRADLE VARIABLE
6" SOLID WALL PVC TO
DAYLIGHT VARMINT
SCREEN TO BE PLACED
ON OPEN END
I
a
d
FLOW
to
D
CONCRETE
d
----
-
-
-
----------
`COLLECTOR PIPE TO
BE CAPPED ON BOTH
LIMIT OF CONCRETE ENDS
CRADLE
PLAN VIEW 6" PERFORATED
PVC COLLECTOR
PIPE
1'
PROPOSED
3' GRADE ON
DOWNSTREAM
SIDE OF DAM
VARIABLE 1.5' MIN.
#57 WASHED
STONE
1.5'
- - - - - - - - - - - - - --------
FLOW CONCRETE
N
4 1.5'
LIMIT OF CONCRETE)
CRADLE 2
SECTION VIEW
FILTER DIAPHRAGM DETAIL
NOT TO SCALE
NOTES:
MINIMUM DENSITY SHALL NOT BE LESS THAN 95% OF MAXIMUM DRY DENSITY WITH MOISTURE CONTENT
WITHIN +/- 2% OF THE OPTIMUM. EACH LIFT OF FILL SHALL BE COMPACTED AS NECESSARY TO OBTAIN THAT
DENSITY. ALL COMPACTION IS DETERMINED PER AASHTO METHOD T-99 (STANDARD PROCTOR).
DAM EMBANKMENT IS TO BE SEEDED IMMEDIATELY AFTER DAM CONSTRUCTION IS COMPLETE.
STORMWATER MANAGEMENT STRUCTURE IS TO BE UTILIZED AS A TEMPORARY EROSION CONTROL DEVICE
INITIALLY. ONCE CONSTRUCTION IS COMPLETED AND UPSTREAM SURFACES HAVE BEEN PERMANENTLY
STABILIZED, CONTRACTOR IS TO REMOVE ALL SEDIMENT FROM BASIN AND CONVERT TO PERMANENT
WATER QUALITY STRUCTURE. THIS INCLUDES INSTALLING THE PROPOSED PLANTINGS ALONG THE LITTORAL
SHELF.
DAM EMBANKMENT CONSTRUCTION NOTES:
1. CONSTRUCTION OF THIS DAM SHALL BE DONE UNDER THE OBSERVATION OF A QUALIFIED
GEOTECHNICAL ENGINEER, WHO IS A REGISTERED PROFESSIONAL ENIGINEER IN THE STATE OF NORTH
CAROLINA. CONTROLLED FILL, AS SPECIFIED BY THE GEOTECHNICAL ENGINEER, IN THE DAM
EMBANKMENT SHALL BE PLACED IN 6-INCH LOOSE LAYERS (3-INCH LOOSE LAYERS WITHIN 3-FEET OF
EITHER SIDE OF THE PRINCIPAL SPILLWAY PIPE TO A DEPTH OF 2-FEET OVER THE PIPE) AND SHALL BE
COMPACTED TO A DENSITY OF NO LESS THAN 95% OF THE STANDARD PROCTOR MAXIMUM DENSITY AT
A MOISTURE CONTENT OF + OR - TWO PERCENTAGE POINTS OF THE OPTIMUM MOISTURE CONTENT IN
ACCORDANCE WITH ASTM D698.
2. ALL VISIBLE ORGANIC DEBRIS SUCH AS ROOTS AND LIMBS SHALL BE REMOVED FROM THE FILL
MATERIAL PRIOR TO COMPACTION TO THE REQUIRED DENSITY. SOILS WITH ORGANIC MATTER
CONTENT EXCEEDING 5% BY WEIGHT SHALL NOT BE USED. STONES GREATER THAN 3-INCH (IN ANY
DIRECTION) SHALL BE REMOVED FROM THE FILL PRIOR TO COMPACTION.
3. FILL MATERIAL PLACED AT DENSITIES LOWER THAN SPECIFIED MINIMUM DENSITIES OR AT MOISTURE
CONTENTS OUTSIDE THE SPECIFIED RANGES OR OTHERWISE NOT CONFORMING TO SPECIFIED
REQUIREMENTS SHALL BE REMOVED AND REPLACED WITH ACCEPTABLE MATERIALS.
4. ANY FILL LAYER THAT IS SMOOTH DRUM ROLLED TO REDUCE MOISTURE PENETRATION DURING A
STORM EVENT SHALL BE PROPERLY SCARIFIED PRIOR TO THE PLACEMENT OF THE NEXT SOIL LIFT.
FAIRCLOTH SKIMMER
OR APPROVED EQUAL.
TOP OF RISER
PRE -CAST BOX
WATER -TIGHT SCREW ON CAP
WITH ORIFICE DRILLED INTO CAP.
SEE POND PLAN SHEET FOR
ORIFICE SIZE AND ELEVATION.
40.
o
FLEXIBLE PIPE
0
o
DIP DRAIN WITH GATE
VALVE AND HAND WHEEL.
ANCHOR TO OUTLET STRUCTURE.
VAVLE TO BE OPEN DURING
CONSTRUCTION.
DIAMETER: 6"
PVC PIPE 1'
MII
z
SEE POND PLAN FOR
ACTUAL FOOTER DIMENSION,
WHICH MAY EXCEED MINIMUM
5. SURFACE WATER AND STREAM FLOW SHALL BE CONTINUOUSLY CONTROLLED THROUGHOUT
CONSTRUCTION AND THE PLACEMENT OF CONTROLLED FILL.
6. FOUNDATION AREAS MAY REQUIRE UNDERCUTTING OF COMPRESSIBLE AND/OR UNSUITABLE SOILS IN
ADDITION TO THAT INDICATED ON THE PLANS. ALL SUCH UNDERCUTTING SHALL BE PERFORMED AT
THE DISCRETION OF THE GEOTECHNICAL ENGINEER AND SHALL BE MONITORED AND DOCUMENTED. IN
NO CASE SHALL THERE BE AN ATTEMPT TO STABILIZE ANY PORTIONS OF THE FOUNDATION SOILS WITH
CRUSHED STONE.
7. TREATMENT OF SEEPAGE AREAS, SUBGRADE PREPARATION, FOUNDATION DEWATERING AND ROCK
FOUNDATION PREPARATION (I.E., TREATMENT WITH SLUSH GROUTING, DENTAL CONCRETE, ETC.) MAY
BE REQUIRED AT THE DISCRETION OF THE GEOTECHNICAL ENGINEER. ALL SUCH ACTIVITIES SHALL BE
CLOSELY MONITORED AND DOCUMENTED BY THE GEOTECHNICAL ENGINEER.
8. FILL ADJACENT TO THE RISER AND PRINCIPAL SPILLWAY PIPE SHALL BE PLACED SO THAT LIFTS ARE AT
THE SAME LEVEL ON BOTH SIDES OF THE STRUCTURES.
9. EARTHWORK COMPACTION WITHIN 3-FEET OF ANY STRUCTURES SHALL BE ACCOMPLISHED BY MEANS
OF HAND TAMPERS, MANUALLY DIRECTED POWER TAMPERS OR PLATE COMPACTORS OR MINIATURE
SELF-PROPELLED ROLLERS.
10. COMPACTION BY MEANS OF DROP WEIGHTS FROM A CRANE OR HOIST SHALL NOT BE PERMITTED.
11. HEAVY EQUIPMENT SHALL NOT BE ALLOWED TO PASS OVER CAST -IN -PLACE STRUCTURES (INCLUDING
THE CRADLE) UNTIL ADEQUATE CURING TIME HAS ELAPSED.
12. TO RE-ESTABLISH VEGETATION AFTER CONSTRUCTION, A 2- TO 3-INCH LAYER OF TOPSOIL SHALL BE
PLACED ON THE DISTURBED EMBANKMENT SURFACE AND THE AREA SEEDED AND MULCHED OR
HYDROSEEDED.
13. THE EMBANKMENT MATERIAL SHALL BE COMPRISED OF CLAYEY SAND OR SANDY CLAY WITH A
MINIMUM OF 30% PASSING THE #200 SIEVE, A LIQUID LIMIT OF AT LEAST 25 AND A PLASTICITY INDEX OF
AT LEAST 10%, AND LESS THAN 5% ORGANICS. THIS MATERIAL SHALL ALSO HAVE A UNIFIED SOIL
CLASSIFICATION OF SC OR CL.
INSURE TOP OF STONE IS LEVEL
WITH THE TOP OF SHELF AND THE
PERMANENT POOL ELEVATION
SHELF WIDTH:
SEE PLAN
PERMANENT POOL
2
�1 z 2
FOREBAY 1 F 18" THICK CLAS:::i 1
RIP RAP OVER DRAINABLE
FILTER FABRIC
16" nn ni nTr
NOT TO SCALE
�1
2
CONTRACTOR SHALL PROVIDE
STEPS IN ACCORDANCE WITH
NCDOT STD. 840.66. STEPS
SHALL BE PLACED AT 16" O.C.
DRAIN VALVE
PERMANENT OUTLET STRUCTURE
NOT TO SCALE
EMBANKME
OUTLET
BARREL
1'
N�
INSTALLATION AND MAINTENANCE OF LANDSCAPING:
1. ALL LANDSCAPING SHALL BE OF NURSERY -STOCK QUALITY AND SHALL BE INSTALLED IN A SOUND
WORKMANLIKE MANNER AND ACCORDING TO ACCEPTED GOOD PLANTING PROCEDURES. ALL
LANDSCAPING SHALL BE ADAPTABLE TO CLIMATIC CONDITIONS OF THE AREA, AND CONSIDERATION SHALL
BE GIVEN TO NOT PLANTING LARGE TREES NEAR UTILITIES. ALL LANDSCAPING SHALL BE MAINTAINED IN
GOOD CONDITION.
2. ALL PLANTS SHALL MEET OR EXCEED THE MINIMUM STANDARDS SET BY THE U.S.D.A. STANDARD FOR
NURSERY STOCK SPONSORED BY THE AMERICAN ASSOCIATION OF NURSERYMEN, INC.
3. ALL LANDSCAPING SHALL AT ALL TIMES SHALL PRESENT A HEALTHY, NEAT, CLEAN, ORDERLY,
DISEASE -FREE AND PEST -FREE APPEARANCE.
4. ALL LANDSCAPING SOIL AND FILL SHALL BE FREE FROM WEEDS, REFUSE, AND DEBRIS AT ALL TIMES.
5. ANY DEAD PLANT MATERIAL OR MATERIAL THAT FAILS TO SHOW HEALTHY GROWTH MUST BE REMOVED
WITHIN 30 DAYS.
6. REPLACEMENT OF REMOVED PLANT MATERIAL MUST TAKE PLACE WITHIN 90 DAYS OF REMOVAL OR
NOTIFICATION BY THE CITY, WHICHEVER OCCURS FIRST.
7. ANY REPLACEMENT PLANT MATERIAL MUST MEET THE SIZE AND OTHER CHARACTERISTICS OF NEWLY
PLANTED MATERIAL.
8. MAINTENANCE OF THE LANDSCAPING IS THE RESPONSIBILITY OF THE OWNER.
ACCESS DOOR SHALL
OPEN TO ALLOW ACCESS
FROM DIRECTION OF DAM.
INSTALL SLOPE PROTECTION MATTING
ON ALL SLOPES STEEPER THAN 6:1 \
AND FLOOR OF POND
TOP OF EMBANKMENT
STEPS SHALL ALIGN WITH
ACCESS DOOR
3
1
OUTLET STRUCTURE I It
SEE DETAIL THIS SHEET I T
6' WIDE VEGETATED SHELF 6:1 SLOPE
1 I (SEE POND PLAN FOR LOCATION)
6 I C
3/4" LOCK BOLT 8 TYPICAL
COAT ALL STEEL SURFACES
W/ FOX INDUSTRIES FX-420
COAL TAR EPDXY COATING
3/4" HINGE OR APPROVED EQUAL.
16' SQ.
#6 REBAR ENTRY GUARD STEEL SURFACES WHICH ARE
TO RECEIVE FX-240 COAL TAR
" ANGLE (TYP.) EPDXY COATING SHOULD BE
PREPARED BY ABRASIVE
oi� �v�.r� DOLT 8 TYPICAL BLASTING TO A COMMERCIAL
GRAY METAL (SP-6)
STANDARD. ANY SURFACE
BLASTED SHOULD BE COATED
SEE PLAN THE SAME DAY. IF PREPARED
3/4" DOWEL LOCKING SURFACES ARE
ALUMINUM PIN 3/4" HANDLE CONTAMINATED BY RUST OR
OTHER CONTAMINANTS, THEY
TRASH RACK DETAIL MUST BE RE -BLASTED.
NTS
NOTES:
1. EMBANKMENT SHALL BE CONSTRUCTED OF CLEAN STRUCTURAL SOIL, FREE OF
ROOTS, VEGETATION, ROCKS & OTHER OBJECTIONABLE MATERIAL. SCARIFY
SURFACES BEFORE PLACING FILL. PLACE FILL IN 6-8 INCH LOOSE LIFTS.
COMPACTS TO AT LEAST 95% OF THE STANDARD PROCTOR DENSITY.
2. CONTRACTOR TO SUPPLY SHOP DRAWINGS OF RISER STRUCTURES PRIOR TO
FABRICATION.
3. ALL RISERS SHALL BE PRECAST CONCRETE SOLID 6" WALL STRUCTURES.
4. 4-6 INCH LAYER OF AMENDED SOIL IS RECOMMENDED IN ANY AREA WHERE
PLANTINGS ARE REQUIRED (SEE NCDENR BMP DESIGN MANUAL).
TOP OF RISER
OUTLET STRUCTURE NOTES:
1. ALL STRUCTURES OVER T-6" IN DEPTH TO BE
PROVIDED WITH STEPS V-2" ON CENTERS. STEP
SHALL BE IN ACCORDANCE WITH STANDARD 841
2. CLASS "B" CONCRETE TO BE USED.
3. ALL MOTOR JOINTS ARE 1/2" ± 1/8"
4. FORMS ARE TO BE USED FOR THE CONSTRUCTI,
OF THE BOTTOM SLAB.
5. ALL RISER JOINTS SHALL BE WATER -TIGHT AND
(4) GALVANIZED STEEL PLATES 10"X10"X1/4" TH
(4) 1/2 INCH BOLTS PER PLATE.
6. FOOTER SHALL BE SECURED TO RISER WITH
STRUCTURAL STEEL.
7. RISER SHALL BE ENGINEERED BY PRECASTER'S
STRUCTURAL ENGINEER TO RESIST BUOYANCY
PRE -CAST BOX
BARREL OUTLET INVERT
DURING EROSION CONTROL STAGES, ALL RISER
ORIFICES SHALL BE TEMPORARILY PLUGGED,
EXCEPT FOR THE TEMPORARY SKIMMER.
AT TIME OF SKIMMER REMOVAL, THE DRAIN
VALVE SHALL BE CLOSED AND ALL RISER
ORIFICES SHALL BE UNPLUGGED.
INSTALL 4" PVC TEE WITH
SCREW TYPE PLUG
ONCE SKIMMER IS REMOVED
AND POND NO LONGER OPERATES
AS A TEMPORARY SEDIMENT BASIN
SKIMMER \
DEWATERING
DEVICE
J CONNECT FLEXIBLE PIPE
TO POND DRAIN. GATE
FLEXIBLE PIPE VALVE SHALL REMAIN
OPEN. REMOVE SKIMMER
ONCE POND IS NO LONGER
UTILIZED AS TEMPORARY
SEDIMENT BASIN.
IN BOTTOM OF PVC TEE
ONCE SKIMMER IS REMOVED
AND POND NO LONGER OPERATES
AS A TEMPORARY SEDIMENT BASIN
SECTION X-X
OUTLET STRUCTURE
NOT TO SCALE
4' 1. D.
SEE POND PLAN FORS
ACTUAL RISER DIMENSION,
WHICH MAY EXCEED MINIMUM
X
PLAN VIEW
NOT TO SCALE
DAM WIDTH: SEE PLAN INSTALL SLOPE PROTECTION MATTING
ON ALL SLOPES STEEPER THAN 3:1
EMERGENCY SPILLWAY_ SEED & MULCH EMBANKMENT
SEE SEEDING SCHEDULE
2' MIN.
ONCRETE CRADLE (MIN. 2000 PSI) I I 3
OUTLET BARREL: CLASS 3 RCP WITH LOCKING WATER-TIGHT'O' RING JOINTS
4\_
EMBANKMENT SECTION1
NOT TO SCALE I 5' CONCRETE CRADLE (MIN. 2000 PSI)
r 2-FT DEEP CUT OFF TRENCH
STORMWATER WET POND DETAIL
EXCAVATE TRENCH ALONG CENTERLINE
OF EMBANKMENT AND EXTEND INTO BOTH
ABUTMENTS TO AT LEAST THE ELEVATION
OF THE RISER CREST. VERIFY DIMENSIONS
WITH GEOTECHNICAL ENGINEER BASED
UPON FIELD INSPECTION.
GEOTECHNICAL CERTIFICATION NOTE:
ASBUILT CERTIFICATION OF THE EMBANKMENT COMPACTION, ANTI -SEEP COLLARS,
CUT OFF TRENCH, ETC. WILL BE REQUIRED PRIOR TO CERTIFICATE OF OCCUPANCY
ALL CONSTRUCTION TO BE IN ACCORDANCE
WITH ALL TOWN OF YOUNGSVILLE, FRANKLIN
COUNTY, NCDEQ AND NCDOT STANDARDS,
SPECIFICATIONS, AND DETAILS
SEE FILTER DIAPHRAGM DETAIL
SEE DETAIL. THIS SHEET
REFER TO PLAN SHEETS FOR
INFORMATION
Y
OUTLET
BARREL
AS REQUIRED BY BOX
MANUFACTURER
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