SW6231002_Plansheet - SCM Detail_20240805 (6)

A B E
MIN DEPTH=2.13' I � / /' / WET POND (SCM 11) GENERAL NOTES:
/
10'A4W T / / / / �� / 1. PRIOR TO OR DURING CONSTRUCTION,THE CONTRACTOR SHALL NOTIFY THE
ELEV.3,6�OAM / / ENGINEER OF ANY DISCREPANCIES IN THE PLANS OR SPECIFICATIONS.
AZ2. ALL CONSTRUCTION SHALL BE IN ACCORDANCE WITH ALL APPLICABLE FEDERAL,
� I \ \\�`/ // / - STATE(e.g.MINIMUM DESIGN CRITERIA),AND LOCAL STANDARDS AND 0
SPECIFICATIONS,HEREBY INCORPORATED BY REFERENCE.
/ - - _ _ _ 3. CONTRACTOR SHALL OBTAIN A COPY OF THE SITE GEOTECHNICAL REPORT.THE °u
- ` REPORT AND ITS RECOMMENDATION SHALL BE PART OF THE STANDARDS AND
4, �f / / N
/ / ^ / ���/II` �/ / h� c� / / - - - - SPECIFICATIONS FOR CONSTRUCTION OF THE SCM.UPON COMPLETION OF ( N
/ pb Zj / A _ CONSTRUCTION,CERTIFICATION OF THE SCM BY THE GEOTECHNICAL ENGINEER WILL 11
\ > / /� _ / / - I ' - - - - - - BE REQUIRED PRIOR TO FINAL SCM ACCEPTANCE.
\III/ NII/ a \ \ \\\h/
/ \\1 \ / / - - - - - - - - - - - 4. THE GEOTECHNICAL ENGINEER SHALL EVALUATE SOILS FOR SUITABILITY OF DAM r 3
r > / CONSTRUCTION AND SLOPE STABILITY. 3 L
5.% / / / \\ / / / / / / /
/ - � PRIOR TO PLACEMENT OF EMBANKMENT FILL,THE GEOTECHNICAL ENGINEER WILL n� in 1.80 TO EXTEND TO EX.RIPRAP DISSIPATOR WETLANDS EXISTING 365 SUPERVISE THE FOUNDATION PREPARATION AND APPROVE THE DEPTH AND EXTENT N M
/ �I�\�� NCDOT CLASS'1'STONE / \ ' //--WETLANDS L
_ / - - OF THE CUTOFF TRENCH. LA c)
(D50=10") y // - - - - Z c�
MIN LENTH=20.0' / v/' / - \ 6. THE DAM AND FOREBAY BERMS SHALL BE CONSTRUCTED IN ACCORDANCE WITH THE
MIN WIDTH =7.5' �\ I' /- _____ _ - _' ` FOLLOWING SPECIFICATIONS UNLESS SUPERCEDED BY THE GEOTECHNICAL U �
MIN DEPTH-2.13' �� / - - - - - - - _ ENGINEER'S RECOMMENDATIONS.
SCM MAINTENANCE , \ \\ BORROW MATERIALS FOR USE AS EMBANKMENT FILL SHALL BE FREE OF j
/ _ - - - - _&ACCESS EASEMENT BALLAST CONCRETE NOT SHOWN ORGANICS,ROOTS AND OTHER WOODY VEGETATION OR ORGANIC DEBRIS. L
FILL MATERIALS SHALL CONSIST OF SOILS WHICH CLASSIFY AS SC,SM,CL,CL-CH O
4"NRS GATE VALVE AND ML IN ACCORDANCE WITH THE UNIFIED CLASSIFICATION SYSTEM OR AS
\ / HW 11 I \ \ FLANGED,CAST IRON BODY MANHOLE STEPS LL Q
@16"O.C.VERT. APPROVED BY THE GEOTECHNICAL ENGINEER. Y
WITH STEM EXTENSION u L
66)\ . • FILL MATERIALS SHALL HAVE A MAXIMUM PARTICLE SIZE OF 3 INCHES IN MEAN AND HANDWHEEL (SEE NCDOT 840
I - c
FILTER DIAPHRAGM o - DIAMETER.(SEE DETAIL SHEET C9.06) Lil
_ \ 3000 PSI REINFORCED CONCRETE COLLAR • FILL SHALL BE PLACED IN 8 INCH(MAXIMUM)LOOSE LIFTS UNDER THE u
I - 6 WITH 2-LAYERS#4 REBAR AROUND PIPE SUPERVISION OF THE GEOTECHNICAL ENGINEER OR THEIR REPRESENTATIVE.FILL
4"DIP SPOOL (SEE SCM DETAIL SHEET C9.06) SHALL BE BROUGHT UP BY BENCHING INTO THE EXISTING SLOPE.A MAXIMUM
12' 24 HEIGHT OF 2 FEET SHALL BE USED FOR EACH BENCH LIFT TAKING CARE TO
(PE x FLANGED) ®Off. REMOVE ROOT STRUCTURES AS THE FILL PROCEEDS.THE SURFACE OF EACH LIFT
\ SHALL BE SCARIFIED PRIOR TO PLACEMENT OF THE NEXT LIFT IN ORDER TO
@ I\ \ \ 48"WEIR ®® 30"RUBBER EFFECTIVELY TIE THE FILL LIFTS TOGETHER. iss
OPEN END 4"PVC 48" AT NORMAL POOL GASKETED AF
ALL COMPACTION SHALL BE TESTED BY THE SAND CONE METHOD(ASTM D-1556)
4"SCHEDULE 80 PVC SPOOL CLASS III RCP
\ \ \ 3�0� / - _ / � � � / p � I �S � � \ 4"PVC OR NUCLEAR METHOD(ASTM D-6938)AT A RATE OF AT LEAST ONE TEST PER 5,000
\ \ L p� - - I I AF
(TYPICAL) CLEANOUT ° SF PER ONE FOOT OF COMPACTED FILL THICKNESS IN GENERAL AREA FILLS AND
\ \ \ 'O �N�i/ / i j ' �y RISER 11 \ \ \ 2.50"0 ORIFICE ONE TEST PER 50 LINEAL FEET PER LIFT ALONG THE BARREL.
/ DRILLED IN 4"CAP 12 4' PVC TEE
THE MINIMUM COMPACTION SHALL BE A MINIMUM OF 95%OF THE MAXIMUM
/ 3 6" STANDARD PROCTOR DENSITY(ASTM D 698)AT MOISTURE CONTENTS VARYING
FROM 2 PERCENT BELOW TO 3 PERCENT ABOVE OPTIMUM MOISTURE CONTENT J
DETERMINED BY STANDARD PROCTOR TEST TO WITHIN 3 FEET OF THE FINAL J
GRADE. a
/ 3�h / -/ I \ 6" 48" 12" 7. SUBGRADE FOR THE RISER STRUCTURE AND OUTLET PIPE SHALL BE APPROVED BY THE �_ W
GEOTECHNICAL ENGINEER PRIOR TO PLACEMENT.IF THE GEOTECHNICAL ENGINEER 1=
/ MAIN POOL I REQUIRES ADDITIONAL SUBGRADE PREPARATION,THE ADDITIONAL COST SHALL BE Z ' 70
/ / / I � - � � INVERT ELEV.368.5 � \ W �o
y\\II� / /
� \ APPROVED BY THE ENGINEER PRIOR TO PLACEMENT. ^
// /P� , / I� SCM 11 RISER DRAWDOWN DEVICE PLAN w M N
OFF - NORMAL POOL I \ \ \ 3 8. THE OUTLET PIPE SHALL BE BEDDED IN CONCRETE FOR 2/3 OF THE PIPE LENGTH, W Z
�(OQ3gL� g80�op ELEV.375.50 - I \ =1'0" BEGINNING AT THE RISER,AND IN#78 STONE FOR 1/3 OF PIPE LENGTH TO THE L _
\ \ \ OUTLET.SEE DETAILS ON SHEET C9.06. 0 Lu
tip / &VEGETATED SHELF _ I \ \ \ J L
9. EMBANKMENT AND SIDE SLOPES OF THE BASIN SHALL BE STABILIZED PER SEEDING Lu
ELEV.375.0-376.0 I I 38p X
\ � SCHEDULE ON EROSION CONTROL DETAILS SHEET OR SODDED.SEE LANDSCAPE PLAN
ON SHEETS L1.06 AND L1.07 FOR FURTHER PLANTING DETAILS. Z o
10
FOREBAY ���~ / / 5 i I'�( 10. IF,DURING CONSTRUCTION,THE SCM IS TO BE USED AS AN EROSION CONTROL W W
Lu
INVERT ELEV.370.0 I- / - - 3� . I \ MEASURE,THE FOREBAY BERM(S)SHALL NOT BE INSTALLED DURING THE INITIAL
CONSTRUCTION OR WHILE THE SCM IS USED AS AN EROSION CONTROL MEASURE.
�z p- - J HANDWHEELTO 11. THE FOREBAY BERM(S)SHALL BE CONSTRUCTED WITH THE SAME REQUIREMENTS,
EXTEND 12"MIN TRASH RACK(TYPICAL)
ABOVE TRASH RACK (SEE DETAIL SHEET C9.06) AND USING THE SAME METHODS AS THE DAM(SEE NOTE 6).
AUXILIARY SPILLWAY / - - 71 3a5 i I 12. UNLESS OTHERWISE NOTED,ALL PERMANENT STRUCTURES(e.g.RISER/BARREL,WEIR
INVERT ELEV.381.0 by
(SEE DETAIL SHEET C9.07) / 't 0 ~I WALLS,ETC.)ARE TO BE INSTALLED WITH THE INITIAL DAM CONSTRUCTION.
HW-11000 '` - - _ \ \ \ PLACE STEM SUPPORTS 12
PER MANUFACTURER'S (MIN) MANHOLE STEPS 13. FOR SITE BUILT FEATURES(e.g.WEIR WALLS,DROP STRUCTURES,BRIDGES,ETC.),THE �
LIZ / / �� ' / g85 \ RECOMMENDATION @16"O.C.VERT. CONTRACTOR SHALL PROVIDE STRUCTURAL DRAWINGS TO THE DESIGN ENGINEER Z
FOREBAY FILTER BERM j/ ; ,. ,., \ \ \ RISER CREST ELEV.378.50 (SEE NCDOT 840.66) FOR REVIEW AND APPROVAL PRIOR TO CONSTRUCTION.STRUCTURAL DRAWINGS Z)
SHALL BE SIGNED AND SEALED BY A PROFESSIONAL ENGINEER.
(SEE DETAIL SHEET C9.06) / � \ Q
-1101 / \ \ 14. PRIOR TO FINAL GRADING OF THE SCM,THE CONTRACTOR SHALL PROVIDE U
48"WEIR CREST ELEV.377.50 / H
/ / SUFFICIENT AS-BUILT SURVEY INFORMATION TO CONFIRM THAT THE FINISHED SCM �
38.59 LF 36"HPPP @ 0.52% ,. WILL MEET THE SPECIFIC DIMENSIONAL REQUIREMENTS APPLICABLE TO THE SCM. W
RIPRAP DISSIPATOR - w,; ° \ DRAWDOWN PIPE UPTURNED 12"
4 / - - \ ;;;;;;;;; \ THOSE REQUIREMENTS INCLUDE: Z
4 / NCDOT CLASS'1'STONE - \ TO ESTABLISH NORMAL POOL /
OPEN END 4"PVC \ \ \ \ \ \ � ILL d'
2 / (D50=10") 4' \ \ (SECURED TO RISER WALL) POND BOTTOM ELEVATION= 368.50 FT Q
MIN LENTH=12' \ ° _
- - \ \ NORMAL POOL ELEV.375.50 Srr;; / / / / / / / / / / DRAWDOWN OVERFLOW ELEVATION(NORMAL POOL)= 375.50 FT Z
,3$0 -/-I- / / / � MIN WIDTH(W1:W2)=9':15' � � � � \'°'. \ \ ,';,,�„�, \ \ \ \ \ � -
. MIN DEPTH-2 �, \ %%%%% MINIMUM SURFACE AREA AT NORMAL POOL ELEVATION= 10,486 SF M00 Q
12" / / / / / / / / / �� Q W z
4'WEIR CREST ELEVATION = 377.50 FT t^ J
3000 PSI REINFORCED CONCRETE COLLAR 0 Z V. O
;;,;,„;
• j� '•' 'N / \ \ 2.50"O ORIFICE / / / ; 4"PVC \ / 4'X 4'RISER CREST ELEVATION= 378.50 FT
'a u' 36"HPPP / CB 1102 \ \ CLEANOUT \ \ WITH 2 LAYERS#4 REBAR AROUND PIPE Z W W QY
��, ' \ \ DRILLED IN 4"CAP / \ / �12' \ (SEE DETAIL SHEET C9.06) O
��� LOW POINT TOP OF EMBANKMENT(AUXILIARY SPILLWAY)= 381.00 FT U ^/ U
/ - n I..f�
Lu Q
AVERAGE TOP OF EMBANKMENT(+/-0.1 FT)= 382.00 FT = _
/ - - - SS / S`ti 3s / h SS / Ss / SS Ss SS \ /� /� /� ooi „1 I' �
�- g / / \ ° v / i / 15. ELEVATIONS SHALL BE WITHIN 0.1 FEET OF THE ABOVE ELEVATIONS FOR EARTHWORK,
AND 0.05 FEET FOR OUTLET STRUCTURE.ALL SURFACE AREAS ARE THE MINIMUM i
AREAS.REQUEST FOR A REDUCTIONS IN THE MINIMUM VALUES WILL BE CONSIDERED
O Z
\ \ . . lam. l .�. lip. l .�. 1
' W , • W��W ° .,, W '`W W W W W W a, \ \ \ \ \ \ \ \ 4"NRS GATE VALVE '''''"'"'' j j ON A CASE BY CASE BASIS. U -
W- a ° - r,'- - - •/,•a o ,'a,' ti ,. a , / I \ \ />\��\�/> 'g/>\ \� FLANGED,CAST IRON BODY' n 30"RUBBER Q
4 .• ' / \ . ,o;;''% 16. ONCE THE PROJECT SITE HAS BEEN STABILIZED,CONTRACTOR SHALL OBTAIN
4"DIP BOTTOM DRAIN 1%/!;�; I I GASKETED 0'
/ / \/ / / \/ \/ APPROVAL BY EROSION CONTROL INSPECTOR IN ORDER TO REMOVE TEMPORARY
\ (TEMPORARY SKIMMER CLASS III RCP c/�
- - - - - - - - � \ \ \ 2' EROSION CONTROL DEVICES. z
,, '•' � � � _ � / ATTACHMENT FOR I I _
EROSION CONTROL) INVERT OUT- 6+0 +---- ---- • ONCE ALL SEDIMENT AND EROSION CONTROL DEVICES HAVE BEEN REMOVED, J
THE SCM SHALL BE CONVERTED TO A PERMANENT SCM. J
' r..' n; , , • ALL SEDIMENT SHALL BE REMOVED AND DISPOSED OF PROPERLY.
AX
'
• FOREBAY AND VEGETATED SHELF SHALL BE CONSTRUCTED AS SHOWN ON THE
y0 • \ \ \ ff/,�"(SEE
_ CONCRETE PIPE CRADLE PLAN.
OR W//D \ \ \ \ \ DETAIL SHEET C9.06) . VEGETATED SHELF SHALL BE PLANTED PER PLANT SCHEDULE ON LANDSCAPE
ANCHOR W/DOWELS \ ` � \ \ \� •
BALLAST CONCRETE PLAN(SEE SHEET L1.07). Uocusi nedb
REBAR X 12"@ 2'O.C.+/- \ PIPE INSTALLATION MUST PROVIDE e Y
• ,/./. �/ 1.25 CUBIC YARDS REQUIRED �,^
(SEE DETAIL ON SHEET C9.06) '� '� A PIPE JOINT AND CONSTRUCTION JOINT 17. FINAL CERTIFICATION OF THE SCM BY A PROFESSIONAL ENGINEER LICENSED IN THE 1v� ooq��°, °0� 00 0
WITHIN 4 OF RISER WALL FOR STATE IN WHICH THE PROJECT IS LOCATED IS REQUIRED. o �"�% 'oo
- - r°i\ \\ \ COMPACTED STONE OR PREPARED SUBGRADE ARTICULATION AT RISER CLAY LINER SPECIFICATIONS: 9E8o° 0 0,00, ES$/o 0,0. �o
AS RECOMMENDED BY GEOTECHNICAL ENGINEER NOTE: o= e O y o
RISER AND BALLAST CONCRETE HAVE BEEN SIZED BASED ON BUOYANCY THE CONTRACTOR SHALL INSTALL A CLAY LINER TO MAINTAIN A PERMANENT POOL AT THE �� SEAL 9� o0
SCM 11 WET POND PLAN VIEW CALCULATIONS.ADJUSTMENTS TO CONCRETE DIMENSIONS ARE NOT DESIGN ELEVATION.IF THE SITE GEOTECHNICAL ENGINEER DETERMINES THAT THE °
PERMITTED WITHOUT PRIOR WRITTEN APPROVAL.ANY DIMENSIONAL 049066 °
CHANGES TO BALLAST CONCRETE BASE AND RISER MUST BE REQUESTED EXISTING SITE CONDITIONS(SOIL PROPERTIES,EXISTING WATER TABLE,ETC.)INDICATE °
= 390 390 IN WRITING AND MUST BE ACCOMPANIED BY BUOYANCY THAT NORMAL POOL CAN BE MAINTAINED WITHOUT A CLAY LINER,THE GEOTECHNICAL aoojl/G(NE��
a CALCULATIONS SIGNED AND SEALED BY A NORTH CAROLINA ENGINEER WILL PROVIDE NOTICE IN WRITING TO THE PROJECT ENGINEER THAT THE CLAY o'P9°° °°°°I ° °°
m = a� REGISTERED PROFESSIONAL ENGINEER. LINER IS NOT REQUIRED.IF THE CLAY LINER IS NOT INSTALLED,THE OWNER SHALL RECEIVE 00 D N J°
a o� coo m= A CREDIT FOR THE DELETION OF THE LINER. 0000000"400610°07/L/2 024
oM �� AT A MINIMUM,THE CLAY LINER MATERIAL FOR THE WET POND SHALL MEET THE
N o SCM 11 RISER DRAWDOWN DEVICE DETAIL
�� co
�F� =zclJ
^M FOLLOWING SPECIFICATIONS: N
N > Ludo PROPOSED GRADEaz a - UNIFIED SOIL CLASSIFICATION SYSTEM DESIGNATION OF CL,CH,ML,OR SC 0 15 30
N 385 xz ��z �u0-o
��» 385 MINIMUM OF 40%PASSING#200 SIEVE w E
m U z? SCALE:1 inch=30 ft.
• MINIMUM PLASTICITY INDEX OF 12
10,MIN EXISTING GROUND s
TOP OF DAM MAXIMUM PERMEABILITY OF 1 X 10-5 cm/sec
INITIAL PLAN DATE:09/20/2023
3 A MINIMUM OF 2 TESTS OF EACH ABOVE PARAMETER SHALL BE PROVIDED FROM REVISIONS:
Q NORTHWEST SOUTHWEST NORTHEAST SOUTHEAST AN APPROVED LABORATORY ON THE LINER MATERIAL AND PRESENTED TO THE 1-05/15/2024
w 380 100-YR WSEL:380.0 380 I ENGINEER FOR APPROVAL PRIOR TO PLACEMENT OF THE MATERIAL. REVISED PLANS PER REVIEW COMMENTS
0 6'MIN 10-YR WSEL:379.1 COMPACTION TO A MINIMUM OF 95%OF THE MAXIMUM STANDARD PROCTOR
a VEGETATED SHELF M - --- - --- ---------------- ------- -
DENSITY(ASTM D 698),AND WITHIN 3%OF THE OPTIMUM MOISTURE CONTENT
a EL.375.0-376.0 -- 1-YR WSEL:377_7 (MINIMUM OF 1 COMPACTION DENSITY TEST PER 2500 SQUARE FEET).
38.59 F 36"HPPP 0 2% RISER CREST:378.50 AN IN-PLACE MAXIMUM INFILTRATION RATE OF 0.01 INCHES PER HOUR.
u FILTER DIAPHRAGM •
o (SEE DETAIL SHEET C9.06) 12' OPEN • RECOMMENDATIONS OF THE SITE GEOTECHNICAL ENGINEER MAY SUPERCEDE
u 375 TOP EL.:316.5 6 NORMAL POOL WSEL:375.50 b 375 48"WEIR CREST:377.50 THE ABOVE SPECIFICATIONS.
o STA:0+89.9 1
u 48 THE CLAY LINER SHALL BE PLACED UNDER THE BOTTOM OF THE SCM PERMANENT POOL
+48.7" FOREBAY MANHOLE
11 r? MAIN POOL X 24' OPEN AT STEPS TO A MINIMUM THICKNESS OF 8 INCHES.A MINIMUM OF 4 INCHES OF TOPSOIL SHALL BE
Q PLACED ABOVE THE CLAY LINER TO THE FINISHED GRADE AS SHOWN ON THE DRAWINGS
s I r NORMAL POOL AND/OR DETAILS.CARE SHALL BETAKEN WHEN PLACING THE TOPSOIL SO AS NOT TO
o x N y� N NORMAL POOL:375.50 + ' ELEV. DAMAGE THE CLAY LINER.A CLAY/SOIL,NO ORGANICS,MIXTURE MAY BE USED IF THE
370 RGRCP @ 1.59°I° 370 12' j- ABOVE SPECIFICATIONS ARE SATISFIED AND WITH WRITTEN APPROVAL BY THE
0' 2.50"0 IN 4"PVC CAP:374.50 n ° GEOTECHNICAL ENGINEER.
u 63.00 LF 3 ........ .. .........III. i
N 12"SEDIMENT STORAGE 108 PRECAST CONCRETE MATERIALS NOTES:
12"MIN
RIP RAP DISSIPATOR CONCRETE COLLAR 48 (TYPICAL) 6"MIN n 1. ALL PRECAST CONCRETE STRUCTURES SHALL CONFORM TO ASTM C913
9 (SEE PLAN VIEW FOR (SEE DETAIL SHEET C9.06) (RECTANGULAR)OR C478(ROUND).
a SIZING REQUIREMENTS) 58
u � ------ 2. ALL REINFORCED CONCRETE PIPE SHALL CONFORM TO ASTM C76,CLASS III(UNLESS
u 365 CONCRETE CRADLE 365 n ���
OTHERWISE NOTED),
(SEE DETAIL SHEET C9.06) ° \ 2.1. O-RING JOINTS(RGRCP)SHALL CONFORM TO ASTM C443&ASTM C361.
#57 STONE BEDDING 30"RUBBER 2.2• NON O-RING JOINTS(RCP)SHALL CONFORM TO ASTM C990
m (SEE DETAIL SHEET C9.06) 12'MIN n GASKETED WR JOB NUMBER 02190647
4"DIP DRAIN CLASS III RCP ADDITIONAL REQUIREMENTS: DRN:WR DGN:WR CKD:WR
N 4"BOTTOM DRAIN INVERT:369.67 � ` �
360 360 30"RGRCP INVERT:369.50 i i 1. SCMS MUST BE LOCATED WITHIN COMMON OPEN SPACE,AND WITHIN AN ACCESS
v ; «,; ,; ;r ,; ; «,; «, «r,,,,,,,,,,,,,,, «,; « «,; ; ?i?;;i? ;r,. «.. ;, AND MAINTENANCE EASEMENT.
v 8 MIN'„n,GROUT,+„r,+,r, ;GROUT'...............,.; ,u SCM 11 PLAN AND
2"
,;; �oUt,;;,,; ou
;,, ;;, , ;
0+00 0+50 1+ D 1+50 2+DO 2+50 3+00 3+50 4+00 """' """"' """"' """"' 2. AN OPERATIONS AND MAINTENANCE MANUAL AND MAINTENANCE AGREEMENT
o 6' MIN SHALL BE PREPARED AND PROVIDED TO THE OWNER.ADDITIONAL REQUIREMENTS DETAILS
o (e.g.RECORDATION OF EASEMENTS,AGREEMENTS,ETC.)MAY APPLY. _
SCM 11 WET POND PROFILE VIEW
SCM 11 RISER INSIDE WALL ELEVATIONS
ti
SCALE H:VC9,05
A