SW6231002_Plansheet - SCM Detail_20240906

A B E
BALLAST CONCRETE NOT SHOWN WET POND (SCM 6) GENERAL NOTES:
1. PRIOR TO OR DURING CONSTRUCTION,THE CONTRACTOR SHALL NOTIFY THE
ENGINEER OF ANY DISCREPANCIES IN THE PLANS OR SPECIFICATIONS.
// / / // // / \ { II 4, A S GATE VALVE MANHOLE STEPS
/ / / I \ 1 I� / FLANGED,CAST IRON BODY @16"O.C.VERT. 2. ALL CONSTRUCTION SHALL BE IN ACCORDANCE WITH ALL APPLICABLE FEDERAL,
WITH STEM EXTENSION STATE(e.g.MINIMUM DESIGN CRITERIA),AND LOCAL STANDARDS AND
AND HANDWHEEL (SEE NCDOT 840.66) y
SPECIFICATIONS,HEREBY INCORPORATED BY REFERENCE.
M / / ( S I I I .I I ( \ { I ( 3. CONTRACTOR SHALL OBTAIN A COPY OF THE SITE GEOTECHNICAL REPORT.THE
/ / �� / / I ( �I I / I I 1 I J ( / 3000 PSI REINFORCED CONCRETE COLLAR N
I / / / / / / h � 1 I/ REPORT AND ITS RECOMMENDATION SHALL BE PART OF THE STANDARDS AND ;�
C I 6" WITH 2-LAYERS#4 REBAR AROUND PIPE SPECIFICATIONS FOR CONSTRUCTION OF THE SCM.UPON COMPLETION OF L V1
o - J \ / � ��/jj I I (\ (� \ ` (' j I ( ( 4"DIP SPOOL 12 a (SEE SCM DETAIL SHEET C9.06) CONSTRUCTION,CERTIFICATION OF THE SCM BY THE GEOTECHNICAL ENGINEER WILL U
/ MI h wo / -r�i M o AUXILIARY SPILLWAY l / I / I I I I (PE x FLANGED) ®® BE REQUIRED PRIOR TO FINAL SCM ACCEPTANCE. (�
INVERT ELEV.339.0 l / { /�\ I / I / 24 4. THE GEOTECHNICAL ENGINEER SHALL EVALUATE SOILS FOR SUITABILITY OF DAM ro
3 H
'(SEE DETAIL SHEET C9.06) J ®® 3
18"W x 18"H ORIFICE 24"RUBBER CONSTRUCTION AND SLOPE STABILITY. 3
OD in ' I I OPEN END 4"PVC `�
{ \Cq M I �"r'ol� I �1 ) oN 1 ( � N 48 AT NORMAL POOL GASKETED 5. PRIORTO PLACEMENT OF EMBANKMENT FILL,THE GEOTECHNICAL ENGINEER WILL Q� ^ O O
/ 547 / / / / I Il I ( r� ( \ (I ° 4"SCHEDULE 80 PVC SPOOL 4"PVC CLASS III RCP SUPERVISE THE FOUNDATION PREPARATION AND APPROVE THE DEPTH AND EXTENT N M
(TYPICAL) CLEANOUT OF THE CUTOFF TRENCH. N Z co
/ _ - / J SCM MAINTENANCE 1 2.50"0 ORIFICE 6. THE DAM AND FOREBAY BERMS SHALL BE CONSTRUCTED IN ACCORDANCE WITH THE �o
/ I / / b� &ACCESS EASEMENT 1 I 12 4"PVC TEE i
/ M / j// //A { ` DRILLED IN 4"CAP FOLLOWING SPECIFICATIONS UNLESS SUPERCEDED BY THE GEOTECHNICAL U
` 6" ENGINEER'S RECOMMENDATIONS. _ rn
BORROW MATERIALS FOR USE AS EMBANKMENT FILL SHALL BE FREE OF v +�
ORGANICS,ROOTS AND OTHER WOODY VEGETATION OR ORGANIC DEBRIS. C fl.
6'4-HW ~��I I I I ) 1 ( ( 1 \ FILL MATERIALS SHALL CONSIST OF SOILS WHICH CLASSIFY AS SC,SM,CL,CL-CH
ru
6 48 6 12 AND ML IN ACCORDANCE WITH THE UNIFIED CLASSIFICATION SYSTEM OR AS �/ Q
LL
/ r/ � I I / I I I1I ( I \ \ \\ I APPROVED BY THE GEOTECHNICAL ENGINEER.RIPADISSIPATO
5 NCDOT CLASS'1'STONE FILL MATERIALS SHALL HAVE A MAXIMUM PARTICLE SIZE OF 3 INCHES IN MEAN N
(D50=10") MAIN POOL ( I (I ( � \ I SCM 6 RISER DRAWDOWN DEVICE PLAN DIAMETER. O
MIN LENTH=10' `' INVERT ELEV.327.0 / I I / / / ( y ` ( 1 > I _ _p _j
MIN WIDTH(W1:W2)=7.5':12.5' FILL SHALL BE PLACED IN 8 INCH(MAXIMUM)LOOSE LIFTS UNDER THE
/ J ( 1
MIN DEPTH=2' fi \ / ( SUPERVISION OF THE GEOTECHNICAL ENGINEER OR THEIR REPRESENTATIVE.FILL
/ ( 1 FOREBAY FILTER BERM
SHALL BE BROUGHT UP BY BENCHING INTO THE EXISTING SLOPE.A MAXIMUM
(SEE DETAIL SHEET C9.06) 1 1 \
/ � � HEIGHT OF 2 FEET SHALL BE USED FOR EACH BENCH LIFT TAKING CARE TO
FOREBAY - / / / / ( < �� \\ REMOVE ROOT STRUCTURES AS THE FILL PROCEEDS.THE SURFACE OF EACH LIFT
INVERT ELEV.328.0 \ \ , \ / o / / / ( / 1 I I ) � ) SHALL BE SCARIFIED PRIOR TO PLACEMENT OF THE NEXT LIFT IN ORDER TO ILIL
&VEGETATED SHELF M �_I M / / ( I ( / l / / / l ( I 1 / / / EFFECTIVELY TIE THE FILL LIFTS TOGETHER.
ELEV.332.0-333.0
"� I l / / / 1-1 ALL COMPACTION SHALL BE TESTED BY THE SAND CONE METHOD(ASTM D-1556) AFAW
_ � o
(SEE SHEET L1.06 FOR ^I / M/ o J I I 1 // `� (/ ( ( j/ / OR NUCLEAR METHOD(ASTM D-6938)AT A RATE OF AT LEAST ONE TEST PER 5,000
/ I PLANTING DETAILS) / M N I I / 2p ` r M SF PER ONE FOOT OF COMPACTED FILL THICKNESS IN GENERAL AREA FILLS AND
o �33o ONE TEST PER 50 LINEAL FEET PER LIFT ALONG THE BARREL.
/ RIPRAP DISSIPATOR i THE MINIMUM COMPACTION SHALL BE A MINIMUM OF 95%OF THE MAXIMUM
NCDOT CLASS'1'STONE / ��'� I I M - - \ RISER 6 / - / M h ( / / J//L
(D50=10") I I / / / / M / / / // / STANDARD PROCTOR DENSITY(ASTM D-698)AT MOISTURE CONTENTS VARYING
360 MIN LENTH=8' FROM 2 PERCENT BELOW TO 3 PERCENT ABOVE OPTIMUM MOISTURE CONTENT V
3 / _ MIN WIDTH(W1:W2)=6':10' ;.;i- / / �/ / j /I / /, / TRASH RACK(TYPICAL) DETERMINED BY STANDARD PROCTOR TEST TO WITHIN 3 FEET OF THE FINAL J
60/ / MIN DEPTH=2' ( / - _ _ _ / / [�/ / // / / / / I \/ ^'ll\\ (SEE DETAIL SHEET C9.06)
~~ NORMAL POOL / / / / HANDWHEELTO GRADE. o
600-HWY _ T / 1/ (/ / / / / / �� / �\\ EXTEND 12"MIN 12 MANHOLE STEPS N
ELEV.332.50 00 / / ABOVE TRASH RACK (MIN) 7. SUBGRADE FOR THE RISER STRUCTURE AND OUTLET PIPE SHALL BE APPROVED BY THE F w
M io �-DTI �� FILTER DIAPHRAGM J / /� / / // /� @16"O.C.VERT. GEOTECHNICAL ENGINEER PRIOR TO PLACEMENT.IF THE GEOTECHNICAL ENGINEER Z
/ n (SEE NCDOT 840.66) `^
/ °,° I� / ��' / (SEE DETAIL SHEET C9.06) / / / // I / REQUIRES ADDITIONAL SUBGRADE PREPARATION,THE ADDITIONAL COST SHALL BE W w 70
`� pF OPM / l / l / l / / RISER CREST ELEV.337.50 APPROVED BY THE ENGINEER PRIOR TO PLACEMENT. W N
10'MAN v 3a0� / J C� / l f J l 11 / l ( / ''''''''' 8. THE OUTLET PIPE SHALL BE BEDDED IN CONCRETE FOR 2/3 OF THE PIPE LENGTH, W p� U
PLACE STEM SUPPORTS BEGINNING AT THE RISER,AND IN#78 STONE FOR 1/3 OF PIPE LENGTH TO THE Ln t=7
- - _ PER MANUFACTURER'S OUTLET.SEE DETAILS ON SHEET C9.06. -
/ / / / _ / - �s / // RECOMMENDATION W J
360 / / �q M / o / / / ( \ 9. EMBANKMENT AND SIDE SLOPES OF THE BASIN SHALL BE STABILIZED PER SEEDING x
p / 335 / / /
I/ SCHEDULE ON EROSION CONTROL DETAILS SHEET C10.06 OR SODDED.SEE LjL Ln
1 / Q / / 330 / / / 1 / / EXISTING N 1 18"W x 18"H ORIFICE INVERT ELEV.335.00 LANDSCAPE PLAN ON SHEET L1.06 FOR FURTHER PLANTING DETAILS. Z o
Co 10
M/. / // - / / - H�LS� / / / WETLANDS( \III/ \ /\, 10. IF,DURING CONSTRUCTION,THE SCM IS TO BE USED AS AN EROSION CONTROL W 00
I I / / n MEASURE,THE FOREBAY BERM(S)SHALL NOT BE INSTALLED DURING THE INITIAL W
3k / DRAWDOWN PIPE UPTURNED 12" �\ \��\�
TO ESTABLISH NORMAL POOL / / / / j CONSTRUCTION OR WHILE THE SCM IS USED AS AN EROSION CONTROL MEASURE.
RIPRAP DISSI [ I (SECURED TO RISER WALL) OPEN END 4'PVC / \ \ \ \ \ 11. THE FOREBAY BERM(S)SHALL BE CONSTRUCTED WITH THE SAME REQUIREMENTS, _
'Bl STONE S NCDOT CLASS l
/ / (D50=8") \ `�\ NORMAL POOL ELEV.332.50 n \ \ \ / / �' '�' �' AND USING THE SAME METHODS AS THE DAM(SEE NOTE 6).
3000 PSI REINFORCED
MIN LENTH=12' ) ° \ 12. UNLESS OTHERWISE NOTED,ALL PERMANENT STRUCTURES(e.g.RISER/BARREL,WEIR
- �, / � """ �CONCRETE COLLAR WITH
MIN WIDTH=6' \ III � 2.50" ORIFICE 12'I 4"PVC / /�/ 2-LAYERS#4 REBAR WALLS,ETC.)ARE TO BE INSTALLED WITH THE INITIAL DAM CONSTRUCTION.
_ - - - I / / / J I //Z. MIN DEPTH=1.5' ^\ \III/ DRILLED IN 4"CAP CLEANOUT \ AROUND PIPE(SEE SCM
/ / "/ / / _ """' T} / \ / 13. FOR SITE BUILT FEATURES(e.g.WEIR WALLS,DROP STRUCTURES,BRIDGES,ETC.),THE
325 / / In DETAIL SHEET C9.06)
o / // 1 �/ 1 \ �� \ %%%%%%% h /\� CONTRACTOR SHALL PROVIDE STRUCTURAL DRAWINGS TO THE DESIGN ENGINEER
/ P, / J ( \ _ \ I( ( 1� �i . ' \ / \ y \�/ 'g�\� % �\ \ '�C FOR REVIEW AND APPROVAL PRIOR TO CONSTRUCTION.STRUCTURAL DRAWINGS
7 % / `` \ 1 1 SHALL BE SIGNED AND SEALED BY A PROFESSIONAL ENGINEER.
_ \ � ,;,; I ,'� 14. PRIOR TO FINAL GRADING OF THE SCM,THE CONTRACTOR SHALL PROVIDE U
601 JB // / i / \ FLANGED,CAST IRON BODY ` , F_
/ III i I -� ; SUFFICIENT AS-BUILT SURVEY INFORMATION TO CONFIRM THAT THE FINISHED SCM
l I / - ' / ) \ ` ��` - % % - -- ---- ~
I- I WILL MEET THE SPECIFIC DIMENSIONAL REQUIREMENTS APPLICABLE TO THE SCM. � W
4"DIP BOTTOM DRAIN oll THOSE REQUIREMENTS INCLUDE: Z
� I I 24"RUBBER �
(TEMPORARY SKIMMER LL �
ATTACHMENT FOR I GASKETED POND BOTTOM ELEVATION= 327.00 FT Q
/� / / / /� • DRAWDOWN OVERFLOW ELEVATION(NORMAL POOL)= 332.50 FT Z
/ \) EROSION CONTROL) 12" \ \ \ \ \ \ \ SUPPORT PEDESTAL 12, I CLASS III RCP oz Cz _
FOR GATE VALVE INVERT OUT=327.00 -
----- --- • MINIMUM SURFACE AREA AT NORMAL POOL ELEVATION= 12,121 SF Q
SCM 6 WET POND PLAN VIEW
\ \/ / / \/ / / \/ / / / \/ / / \/ / / .12 i'r;ti4?,(4i'r;ti4'r;ti4'rir;4i?„
GROUT};.}; ° 18"W X 18"H ORIFICE INVERT ELEVATION = 335.00 FT J
.. ° °
\ /\ \ \ /\ \ /\ /\ \ \ /\ \ \14 s,• ........ .. ......... +; ¢ , Yd • 4'X 4'RISER CREST ELEVATION= 337.50 FT
\\ n � O
/� • LOW POINT TOP OF EMBANKMENT(AUXILIARY SPILLWAY)= 339.00 FT ^/ /► U
CONCRETE PIPE P:
ANCHOR W/DOWELS . / - - - - / \ \ /\ ,CRADLE AVERAGE TOP OF EMBANKMENT(+/-0.1 FT)= 340.00 FT U
#4 REBAR X 12"@ 2'O.C.+/- / BALLAST CONCRETE / / i (SEE DETAIL ON
�� 1.25 CUBIC YARDS REQUIRED \,�\�\�\�\ � \. SHEET C9.06) 15. ELEVATIONS SHALL BE WITHIN 0.1 FEET OF THE ABOVE ELEVATIONS FOR EARTHWORK,
(SEE DETAIL ON SHEET C9.06) AND 0.05 FEET FOR OUTLET STRUCTURE.ALL SURFACE AREAS ARE THE MINIMUM .
PIPE INSTALLATION MUST AREAS.REQUEST FOR A REDUCTIONS IN THE MINIMUM VALUES WILL BE CONSIDERED Q N O
COMPACTED STONE OR PREPARED SUBGRADE PROVIDE ON A CASE BY CASE BASIS. U -
AS RECOMMENDED BY GEOTECHNICAL ENGINEER NOTE: A PIPE JOINT AND 16. ONCE THE PROJECT SITE HAS BEEN STABILIZED,CONTRACTOR SHALL OBTAIN
RISER AND BALLAST CONCRETE HAVE BEEN SIZED BASED ON BUOYANCY CONSTRUCTION JOINT
CALCULATIONS.ADJUSTMENTS TO CONCRETE DIMENSIONS ARE NOT WITHIN 4'OF RISER WALL APPROVAL BY EROSION CONTROL INSPECTOR IN ORDER TO REMOVE TEMPORARY V)
3: PERMITTED WITHOUT PRIOR WRITTEN APPROVAL.ANY DIMENSIONAL FOR ARTICULATION AT RISER EROSION CONTROL DEVICES. Z
a CHANGES TO BALLAST CONCRETE BASE AND RISER MUST BE REQUESTED • ONCE ALL SEDIMENT AND EROSION CONTROL DEVICES HAVE BEEN REMOVED, J
IN WRITING AND MUST BE ACCOMPANIED BY BUOYANCY THE SCM SHALL BE CONVERTED TO A PERMANENT SCM. J
355 0 355 CALCULATIONS SIGNED AND SEALED BY A NORTH CAROLINA 0
REGISTERED PROFESSIONAL ENGINEER. • ALL SEDIMENT SHALL BE REMOVED AND DISPOSED OF PROPERLY.
�7 M
MMF • FOREBAY AND VEGETATED SHELF SHALL BE CONSTRUCTED AS SHOWN ON THE
mCnz
oLu
SCM 6 RISER DRAWDOWN DEVICE DETAIL . VEGETATED SHELFSHALLBEPLANTEDPERPLANTSCHEDULEONLANDSCAPE
X. PLAN(SEE SHEET L1.06).
/�,b
=1 l�b°k
'D" -DocuSigned by:
350 0 350 17. FINAL CERTIFICATION OF THE SCM BY A PROFESSIONAL ENGINEER LICENSED IN THE 1/�A o `,° r °p %
STATE IN WHICH THE PROJECT IS LOCATED IS REQUIRED. sE86DG9�bFP�iasC'.A RQ °OOoo
CLAY LINER SPECIFICATIONS: o opFEss�p°°a�2°o
O M M o PROPOSED GRADE o =o°Q-� �.9°off o
THE CONTRACTOR SHALL INSTALL A CLAY LINER TO MAINTAIN A PERMANENT POOL AT THE o SEAL o
o
_ �M �rn0 xM DESIGN ELEVATION.IF THE SITE GEOTECHNICAL ENGINEER DETERMINES THAT THEo °
> uwi w> o> 049066 ° a
m 345 =? ��z 9z 345 EXISTING SITE CONDITIONS(SOIL PROPERTIES,EXISTING WATER TABLE,ETC.)INDICATE a a
THAT NORMAL POOL CAN BE MAINTAINED WITHOUT A CLAY LINER,THE GEOTECHNICAL a °° G ENE
ENGINEER WILL PROVIDE NOTICE IN WRITING TO THE PROJECT ENGINEER THAT THE CLAY o°
"' LINER IS NOT REQUIRED.IF THE CLAY LINER IS NOT INSTALLED,THE OWNER SHALL RECEIVE
A CREDIT FOR THE DELETION OF THE LINER. 000000pO°0I04000p0°9/5/2024
N
10'MIN AT A MINIMUM,THE CLAY LINER MATERIAL FOR THE WET POND SHALL MEET THE
v TOP OF DAM FOLLOWING SPECIFICATIONS: N
E 340 340 UNIFIED SOIL CLASSIFICATION SYSTEM DESIGNATION OF CL,CH,ML,OR SC 0 15 30
N x `"' Q MINIMUM OF 40%PASSING#200 SIEVE w- E
m _ _ _ 100-YRWSEL_338.4_ g SCALE:1 inch-30 ft.
-
6'MIN - ---- - -- y
y ryi NORTHWEST SOUTHWEST NORTHEAST SOUTHEAST MINIMUM PLASTICITY INDEX OF 12 S
VEGETATED SHELF x
3 EL.332.0-333.0 _ 10-YR WSEL_336.5_ _ _ MANHOLE MAXIMUM PERMEABILITY OF 1 X 10 5 cm/sec
39°I° INITIAL PLAN DATE:09/20/2023
°° 3 STEPS • A MINIMUM OF 2 TESTS OF EACH ABOVE PARAMETER SHALL BE PROVIDED FROM
REVISIONS:
° 335 _ __1 Y_R_W_S_EL:_335.0_ 335 AN APPROVED LABORATORY ON THE LINER MATERIAL AND PRESENTED TO THE 1.-05/15/2024----
FILTER DIAPHRAGM 115p5 ENGINEER FOR APPROVAL PRIOR TO PLACEMENT OF THE MATERIAL. REVISED PLANS PER COMMENTS
(SEE DETAIL SHEET C9.06) RISER CREST:337.50 ° 2. 07/26/2024
o COMPACTION TO A MINIMUM OF 95/OF THE MAXIMUM STANDARD PROCTOR
z TOP EL.:332.5 NORMAL POOL WSEL:332.50 REVISED PLANS PER COMMENTS
a STA:0+71.0 DENSITY(ASTM D 698),AND WITHIN 3%OF THE OPTIMUM MOISTURE CONTENT
(MINIMUM OF 1 COMPACTION DENSITY TEST PER 2500 SQUARE FEET).
Q 30" AN IN-PLACE MAXIMUM INFILTRATION RATE OF 0.01 INCHES PER HOUR.
N +36.3" 3 Q y
0 330 x-FOREBAY 330 15" OPEN 18 RECOMMENDATIONS OF THE SITE GEOTECHNICAL ENGINEER MAY SUPERCEDE
u -MAIN POOL 18"W x 18"H ORIFICE INVERT:335.00 THE ABOVE SPECIFICATIONS.
o N
THE CLAY LINER SHALL BE PLACED UNDER THE BOTTOM OF THE SCM PERMANENT POOL
77.09 LF 24"RGRCP @ 0.65% SEDIMENT STORA TO A MINIMUM THICKNESS OF 8 INCHES.A MINIMUM OF 4 INCHES OF TOPSOIL SHALL BE
30" PLACED ABOVE THE CLAY LINER TO THE FINISHED GRADE AS SHOWN ON THE DRAWINGS
CONCRETE COLLAR OPEN AT f 6"MIN n AND/OR DETAILS.CARE SHALL BETAKEN WHEN PLACING THE TOPSOIL SO AS NOT TO
325 _ (SEE DETAIL SHEET C9.06). EXISTING GROUND 325 NORMAL POOL DAMAGE THE CLAY LINER.A CLAY/SOIL,NO ORGANICS,MIXTURE MAY BE USED IF THE
RIP RAP DISSIPATOR NORMAL POOL:332.50 _� ELEV. ABOVE SPECIFICATIONS ARE SATISFIED AND WITH WRITTEN APPROVAL BY THE
Y 48"(TYPICAL)CONCRETE CRADLE 126" GEOTECHNICAL ENGINEER.
u (SEE PLAN VIEW FOR I I n
SIZING REQUIREMENTS) (SEE DETAIL SHEET C9.06) 12' 1-1
2.50°0ORIFICE IN 4"PVC CAP:331.50 I � PRECAST CONCRETE MATERIALS NOTES:
m
#57 STONE BEDDINGPRECAST CONCRETE STRUCTURES SHALL CONFORM TO ASTM C913
o (SEE DETAIL SHEET C9.06) 12"MIN n (RECTANGULAR)OR C478(ROUND).
0
u 320 320 2. ALL REINFORCED CONCRETE PIPE SHALL CONFORM TO ASTM C76,CLASS III(UNLESS
42 OTHERWISE NOTED),
i 12' MIN �'� 2.1. O-RING JOINTS(RGRCP)SHALL CONFORM TO ASTM C443&ASTM C361.
24"RUBBER 2.2• NON O-RING JOINTS(RCP)SHALL CONFORM TO ASTM C990 WR JOB NUMBER 02190647
m 4"BOTTOM DRAIN INVERT:328.00 n GASKETED ADDITIONAL REQUIREMENTS: DRN:WR DGN:WR CKD:WR
E 315 315 �� CLASS III RCP
12' 1. SCMS MUST BE LOCATED WITHIN COMMON OPEN SPACE,AND WITHIN AN ACCESS SCM 6 PLAN AND
24"RGRCP INVERT:327.00 4' DIP DRAIN
v 0+ 0 0+50 1+ 0 1+50 2+ 0 2+50 3+ 0 3+50 4+00 4+50 t � �
«,. , AND MAINTENANCE EASEMENT.
v :; «r .....
«,; , «,; «,; ,
8 MIN ROUT,,,,,,,,,
G O
......... .... � .....���� ....... ......... ......... ......... ����� ��������� ��������� ����������� 2. AN OPERATIONS AND MAINTENANCE MANUAL AND MAINTENANCE AGREEMENT
0 6"MIN SHALL BE PREPARED AND PROVIDED TO THE OWNER.ADDITIONAL REQUIREMENTS DETAILS
o (e.g.RECORDATION OF EASEMENTS,AGREEMENTS,ETC.)MAY APPLY.
SCM 6 WET POND PROFILE VIEW -
SCALE H:V
SCM 6 RISER INSIDE WALL ELEVATIONS
a
1"=50':1"=5'
Y s" = 1'-0" C9,00
A B