SW1191201_Plansheet - SCM Detail_20210818

3 7I L . ... . ... ... ... ... ... ... . 10-FT WEW WfOTH "
�-7�1 l'ORBAY WEIR CREST ELEV� 1199,50
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AQUATT11C BENCH ELEV" 11202 - 00
OUTSIDE EDGE OF AQUATIC BENCH 13
N
6-IN ABOVE PERMANENT P'00,1 ...... ELEV
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WWIDE AQUATIC BENCH
TOP O�F'VVEIR ,
AR()UND ENTIRE POND
ELEV, 121 11.010
(SEE SHEETS C-4, 1, & C6, 1)
- AQUATIC BENCH EILEV! 1201-0�)
a
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INSIDE ED�GE OF AQUATIC BENCH IS
6-IN 13ELOVV PERMANENT POOL ELEV
�6-Fl ... LENG . . . . rH
FOREBAY WEIR
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lill ,BMER�,:FD,.
v
ELEV: 12,00.00
............... 1§111111111 I
_____ -
PERMANENT POOL ELEV� 1216,00
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................................
SEQUENCE OF CONVERS�TON FROM SEDIMENT BASIN TO STORMWATER
CONTROL MEASURE
1� INSTALL POND BARREL, OUTLET STRUCTURE, EMBANKMENT AND
ALL OTH�ER POND COMPONENTS.
2, CALL FOR SITE INSPECTION PRIOR TO BACKFILLING POND BARREL,
1 INSTALL TEMPORARY SKIM�MER TO OUTLET STRUCTURE,
4,. EXCAVATE POND TO TEMPORARY SKIMMER BASIN DIMENSIONS,
SEE EROSION CONTROL PLAN.
5� INSTALL BAFFLES AND OTHER TEMPORARY SKIMMER BASIN
COMPONENTS, SEE TEMPORARY SKIMMER BASIN DETAIL ...
6. REFER TO TEMPORARY SEDIMENT SKIMMER BASIN DETAIL FOR
ELEVATION OF SKIMMER CONNECTION.
7� SEE CONSTRUCTION SEQUENCE ON EROSION CONTROL PLAN FOR
INFORMATION,
8. ONCE SITE IS APPROVED, REMOVE TEMPORARY SKIMMER,
BAFFLES AND OTHER TEMPORARY COMPONENTS,
9, FILL HOLE IN OUTLET STRUCTURE FROM SKIMMER WITH
NON -SHRINK GROUT. PROVIDE PERMANENT WATERTIGHT SEAL.
10. EXCAVATE SEDIMENT AND GRADE TO FINAL CONTOURS, SEE
GRADING PLAN,
11, CONSTRUCT WET POND, STORMWATER, CONTROL MEASURE AS
SHOWN ON THE DRAWINGS,,
AS -BUILT SURVEY REQUIREMENTS
NOTE: CONTRACTOR SHALL PROVIDE AS -BUILT TOPOGRAPHIC
SURVEY PERFORMED BY A PROFESSIONAL LAND SURVEYOR CERTIFYING
WET DETENTION POND AREA DIMENSIONS AND ELEVATIONS OF THE
FO,LLO,WING�:
24 .. . IN TH�CK CI .... . ASS B
WPRAP OVER, FILTER
FAB�RIC
100-YR STORIVII ELEV 1,215.29'
10-YR s ... roRm ELEV 1214.86'
2 ... . Yk STORM ELEV 1213 99'
I I 6-FT VVIDE ACCESS
I-YR STORM ELEV I'll � 1.11, , PAD TO OUTLET
"I'l""I'll""I'll'll""I'll""I'll",'I'll",""""'""',,'ll""I'll'll""IlI ........................ I STRUCTURE 6-IN
8 E LOW VVE � R
TOR OF E�MBANKMEN ... r ELEV:� 1216.00
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"rop ELEV� 1215.20, __11-1 - -
10 .... FT WEIR'WIDITH
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1�17� SPILLWAYCIRESTELEV:, 1206,50
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RIPRAP OVER FILTER
FABR�C
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2-F ... r BELOW PRINCIPAL SPILLWAY
WITI .... 111N AQUATIC BENCI .... � FOR
ADEQUATE DRAINAGE
PERMANENT POOL ELEV� 121 1,100
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:=­:�=-- — - --= ... =-=­ � Ek"TELEV 1198 FORESAY ,,'',,''l I MAIN POOL INV=1205,00
42`7�r' T�FET5�PE RIP'RAP PAD, EMBANKMENT
�__ __ __ - , — — ,— __ __ __ _ - TOP OF PERM. SED, STOR, ELEV� 1,205,00
... 1�_.., — — — — — — —
I
_____ 11 . 11 11 11 . 11 l', I 'Il"'l' I'll 2 ,, I I I . 11 ­­­­ "I'll, "I'll'', ­­ "I'll --
"TOP OF PERM. SED. Sl . . . . OR, ,,,,,, ......................... Ill � .
. 11 11 . I . I I . .
I " BOT, OF PERMI, SED, STOR. H EV' 1204 00 ' '
FOREBAY ENTRANCE TOP OF PERM. SED STOR, . .1. .
11
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ELEV: 1197.00 FO,REI
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_
BOT OF PERM ... SED. STOR . .................. ELEV� 119T00 4
.
�!�OIREBAY EN"rRANCE
LL 6" IMPERVIOUS FILL
ELEV: 1196.00
. ", LAYER UNDER ALL ---J
BOT OF PERM. SED. STOR..
I WATER SURFACES
FOREBAY EXIT
ELEV� 1196,50 — I
1� TOPOGRAPHIC SURVEY OF THEWET POND AND EMBANKMENT
1 OUTLET S�TRUC7URE TOPS ANDINVERTS
1 OUTLET STRUCTURE DIMENSIONS
4,. ORIFICE DIAMETERS
5. BARREL PIPE SIZES AND INVERTS
6, EMERGENCY SPILLWAY ELEVATION AND DIMENSIONS . ....................................... �
OUTLET STRUCTURE NOTES
1, CAST -IN -PLACE CONCRETE RISERIS REQUIRED WITHOUT'
EXCEPTION,
2 ... CLASS "'A."' (3,000 PSI) CONCRETE TO, BE USED.
6 �, ALL, MORTOR JOINTS ARE 1/2" i 1/8`1�
T. GROUT SHALL BE NON -,SHRINK (ASTM-C1107),
8, ALL, STRUCTURES OVER 3'-6" IN DEPTH TO BE PROVIDED WITH
STEPS 1'1-2" ON CENTERS, STEPS SHALL BE IN ACCORDANCE WITH
STANDARD 840 ... 66.
9, LOCATE MANHOLE OVER STEPS,.
6-IN DUCTiLE IRON DRAIN PIPE
WITI .... I GATE VALVE AND HAND,
WHEEL
CONCRETE
PIPE ANCHOR
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PVC PRIMARY SP�LLWAY ............................. /
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O�RIF�CE DIAMETER: 3.5-IN
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TEMPORARY SKIMMER TO BE
REMOVED (SEQUENCE OF __V FILL SKIMMER
CONVERSION FROM SEDIMENT I� ... OLE WITi .... I
BASIN .... ro s ... rORMWA .... I .. . ER NON-S� ... IRINK
CONTROI .... MEASURE) GROUT FOR
WATERTIGHT
SEAL
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CONTRACTOR SHALL PROVIDE
S, ... I ... EP IIN ACCORDANCE WITH
NCDOT STD. 840.6,6, STEP'S
SHALL BE PLACED AT 16" O.C.
111"IdEMP11.1111#1111.1114
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__v SEASONAL HIGH WATER TABLE BELOW ELEV� 1192�00
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1-1 END CAP WITH 'I-,
/1, DRILL OPENWG 'I-,
/ / DIAMETER 3.5-IN 1­1 \
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, ,� DRAWDOWN
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SCHEDULE A PRE -INSTALLATION
CONFERENCE PRIOR TO
CONSTRUCTION OF THE
STORMIWATE:R CONTROL MEASUIR,E
.
SEED & MUI .... . CH EMBANKMENT SEE SEEDING SCHEDUI ..... E
(INS ... rALL SLOPE PRamcrm MATTING ON ALL SLOPES
STEEPER THAN 6: 1)
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SPILLWAY % -', ....... t -�,,_�- a . �� � : & -
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`1� �� OUTLET STRUCTURE W-1-1 , , U,_ SELECT FILL �_:%,� SELECT FILL �_� .1 �_ \ \ -*- � 1�
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i -� -1 CORE DRILL AND PROVIDE
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.:, - - r - - - - - ------------ I '_ EXISTTING DROP INI ..... ET
,� "; BARREL OUTLE"r BARREL� 142,-L.F 24" RCP 0_0 1 7.2% St .... OPE (ASTNI C-76. CLASS HI) GASKETED JUNT RPEiMANUFACTURED WITHOUT LIFT 14101 ... ES GASKEtED "",,� - - ,- _
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!J'''''' JOINT PIPE SHALL BEWRAPPED WRH A DOU81 .... E LAYER OF NON ... WOVEN FILTER FASR�C ON THE OUI SIDE OF THE PIPE Al- EACH JOIN], � I _�
1,11'11111. l', I- - WV=1 1 205 - '00 __ , - - - - - - 1 I INV:::::::: 11 71,00 I- �, �l ,,-�
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POND AND EMBANKMENTSECTION \ \ " MIN mw / /
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WET DETENTION BASIN MAINTENANCE SCHEDULE
DESCRIPTION ==
METHOD I FREQUENCY
I SEASON
EMBANKMEN ... r
I
INSPECT AND REPAIR
VISUAL ONCE PERYEAR
,ALL
EROSION / ANIMAL NESTINGS
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—
INSPECT AND RFSEED
VISUAL WHENEVER, NEED�ED
ALL
GRASS COVERAGE
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OUTLET STPUCTURE
DEBRIS /OBSTRUCTIONS
BY � ... IAND W� ... IENEVER NEEDED
ALL
OPERATE POND DR,AiN VALVE
BY HAND
ONCE, PER YEAR
ALL
.
ER,O,SION Ar OUTLE ... r DISCHARGE
I VISUAL
I ONCE PER YEAR
� ALL
FOREBAY /MAIN P001 .....
SEDIMENT � DEBRIS
BY HAND, ONCE PER YEAR
.—
,ALL
REMOVE TRASH
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BY HAND, WHENEVER NEEDED
ALL
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CONTRACTOR SI .... IALL BE RESPONSIBLE FOR MAINTENANCE UNTIL PROJECT CLOSE OUT
AT W� ... 00 ... I T[ME OWNER WILL ASSUMIE MAINTENANCE PESPONSIBILITY.
1 4 ... . PVC TEE - --,*. . A — SPILLWAY �
� INV= 1212.60 1
� v PERMI, POOL ELEV� 12,0t.50 I I / I
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DAM EMBANKMEN ... r CONSTRUC .... � ... ]ON S ... rANDARDS
I. CONTROLLED FILL, AS SPECIFIED BY THE GEOTE(.`,HNICAL ENGINEER, IN THE DAM EMBANKMENTSHALL BE PLA(TD IN 6-INCHI LOOSE LAYERS (3-INCH LOOSE LAYERS WITHIN 3�-FEET OF
EITHER SIDE OF THE PR,INCTPAI ..... SPILI ...... WAY PIPE TO A DEPTH OF 2-FEET OVER THE PIPE) AND SHALI ..... BE COMPACTED TO A DENSITY OF NO I .... ESS 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 SOCH AS ROOTS AND, LIMBS S�HALL BE REMOVED FROM THE FILL MATERIAL PRIOR TO COMPACTION TO THE REQkJlRED DENSITY, SO�ILS WITH ORGANIC MATTER
CONTENT EXCEEDING 5% B�Y WEIGHT SHAI ..... I ...... NOT BE USED. STONES GREATER, THAN 3-JNCH (IN ANY DIRECTION) SHALI ..... BE REMOVED FROM THE FILI ..... PRIOR TO COMPACTION,
3,, FILL MATERIAL PLACED AT DENSITIES LOWER THAN SPECIFIED MINIMUM DENSITIES OR AT MOISTURE CONTENTS OUTSIDE THE SPECIFIED RANGES OR OTHERWISE NOTCONFORMING TO
SPECIFIED REQUIREMENTS SHALL BE REMOVED AND REPLACED WTTH ACCEPTABLE MATERIALS.
4� ANY FILL LAYER ... rHA ... I .... 15 SMOO ... I ... H DRUM ROLLED, ... rO REDUCE MOIS ... I ... URE PENE ... FRA .... � ... ION DURING A STORM EVEN .... I ... SHALL BE PROPERLYSCARIFIED PRIOR TO I .... HE PLACEMEN ... IF OF ... rHE NEX ... I .... SOIIL
LIFT.,
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 T� .... IAT INDICATED ON TI .... IE PLANS. ALL SUCI .... I UNDERCUTTING S[ .... IIALL BE
PERFORM ED AT THE DISCRETION OF TH�E 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 SEEPAGEAREAS, SUBGRADE PREPARATION, FOUNDATION DEWATERING AND ROCK FOUNDATION PREPARATION (I.E., TREATMENT WIT� .... 11 SLLJS� .... I GROLMING, DENTAL CONCRETE,
ETC.) MAY BE REQUIRED ATTHE DISCRETION OF THE GEOTECHNICAL ENGINEER, ALL SUCH ACTIVITIES SHALL BE CLOSELY MONITORED AND DOCUMENTED BY THE GEOTECHNICAL ENGINEER.
8. FILL ADJACENT TO THE RIS�ER 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 S,HAL�L BE ACCOMPLISHED BY MEANS OF HAND TAMPERS, MANUALLY DIRECTED POWER TAMPERS OR PLATE COMPACTORS OR
MINIATURESELF-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) UINTIL ADEQUATE CURING TIME HAS ELAPS�ED.
12- TO RE-ESTAB�LI,SH VEGETATION AFTER CONSTRUCTION, A, 2- TO 3-INCHI LAYER OF TOPSOIL SHALL, BE PLACED ON THIE DISTURBED EMBANKMENT SURFACE AND THIE AREA SEEDED AND
MULCHED OR HYDROSEEDED,
TESTING, OBSERVATION, AND CERTIFICATION
I, TESTS OF THE DEGREE (%) OF COMPACTION OF THE PLACED FILL IN THE DAM SHALL BE PERFORMED AS A PART OF THE PERMITTEE'S NORMAL QUALITY CONTROL PROGRAM FOR THE
CONS .... I ... RLJ,C .... I ... ION OF ... rHE DAM . .... � ... Es .... rs SHALL BE CONDUCTED CONCURRENI ... Wl ... rH I ... HEINS ... rALLA .... FfON OF ... rHE COMPACTED FILL AND .... � ... HE CON ... TRACTOR SHALL COORDINATE THE CONS ... FRUCTION
OF THE DAM 50 THAT THE TESTING CAN BE COMPLETED. SHOULD THE RESULTS, OF THE TESTS, TNDICATE THAT THE SPECIFIED DEGREE OF COMPACTION HAS NOT BEEN OBTAINED; THE
PORTIONS OF THE DAMI REPRESENTED BY SUCH TESTS SHALL BE REWORKED OR REBUILT. ALL PORTIONS OF THE DAM SHALL ACHIEVE THE SPECIFIED MINIMUM DEGREE OF COMPACTION,
2. CONSTRUCTION OF CLASS A, B AND, C DAM EMBANKMENTS SHALL BE DONE UNDER T� .... IE OBSERVATION OF A QUALIFIED GEOTE10 .... INICAL ENGINEER, WHO IS; REGISTERED, AS A PROFESSIONAL
ENGINEER IN THE STATE OF NORTH CAROLINA, THE GEOTECHNICAL ENGINEER MUST HAVE EXPERIENCE IN THE DESIGN AND, CONSTRUCTION MONITORING OF DAMS OF THE SIZE AND SCOPE
COVERED BY THESE STANDARDS AND GUIDELINES.
3. ON CLASS A, B, AND C DAMS, (WITI .... I TI ..... IE EXCEPTION OF DETENTION ONLY CLASS C DAMS T� .... IAT COLLECT DRAINAGE FROM AN AREA OF 25-ACRES OR LESS), TI .... IE GEOTE ' CI .... INICAL ENGINEER,
AS DEFINED ABOVE, SHALL OBSERVE ALL ASPECTS OF THE CONSTRUCTION OF THE DAM (I.E., PREPARATION OF THE FOUNDATION, INSTALLATION OF THE CUT-OFF TRENCH, INSTALLATION OF
... I .... HE PRINCIPAL SPILLWAY PIPE, INSIALLA ... I ... ION OF ... I .... HIE IN ... I .... ERNAL DRAINAGE, INSI ... ALLA ... riON OF COMPAc ... rED FILL, E .... I",C,),. "rHIE FREQUENCY OF OBSERVATION AND ... TIES ... FING MIUST BE
SUFFICIENT FOR, THE GEOTECHNICAL ENGINEER (OR THE DESIGN ENGINEER ON CLASS D DAMS, AND CLASS C, DETENTION ONLY, DAMS) TO STATE, �IN HIS/HER PROFESSIONAL, OPINION,
... � .... HAI .... .. I ... HE SPECIFIC ITEMS OBSERVED AND, ... I .... Es .... rED WERE INSTALLED IN ACCORDANCE WI .... I ... . H .... rHE APPROVED CONS .... I ... RUC .... � ... ION DRAWINGS AND SPECIFICAl ... IONS,
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"I'l""I'll""I'll'll""I'l�"I 0 Ill � "I'l""I'll""I'll'll""I'll""I'll",'ll""I'll""I'll",'ll",'ll""'llI Date
MOR #27
"I'l""I'll""I'll'll""I'll""I'll",'ll""I'll""I'll,'ll""I'll""'ll""I'll""I'll'I
2021 JULY,09
SWR �� 1
ff
2,021 AUG 13
1 .....................l,""""""'.'I
Project Number 171 1 -B
................................ .......................................................................................................................................................................................................................................................................
1 Date: 2021 AUG 13
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Drawn by� FS
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SITE D�E,TAILS
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She!el Number ...
All� Amll�
�
(; 8 0 � �
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NO AQUATIC BENCH
ADJACENT TO FORBAY
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3
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L . . . ............. 8 .... FT WE�R WIDTH
I
2
71
1�1�, IrORBAY WEIR CREST ELEV� 1209,50
� igg i � mjk*x4w*pj
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",',"",',,"",',,,I,"" "I'l""I'll""I'll'll""I'll""IlI "I'l""I'll""I'll'll""I'll""II
TOP O�F'VVEIR ,-
ELEV, 1210.5,0
JI ... LENGTH ......
FOREBAY WEIR
ELEV: 12,09.00
l
PERMANENT POOL ELEV� 1210,50 V
_:_
"I'l""I'll""I'll'll""I'll""I'll",'ll""I'll""I'll",'ll'I ENTRANCE. E
FORESAY LEV� 12(X).540) I
:=,=­:=-=-=-_ _ -=== EM ... r ELEV: 1207.50 __
24" RCP INLET PIPE, --..
, �
__ __ __ _ - , RIP'RAP PAD,
� ... 1� - ,- __ __ __ _ -
..,
11 .11,111.111, 11 I
. ll 11 . I . I I
TOP OF PERM. $ED, $TOR,
. . - . .
FOREBAY ENTRANCE
El .... EV� 1206,25
BOT. OF PERM $ED. STOk
FORERAY ENTRANCE
ELEV: 1205 50
so"r O�!` PERM, SED, STOR . .............................
FOREBAY EX11 ... — ,
ELE'V 12D5.75
__
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'
.-
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M $ED
�Ay ENTR
ELF
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"" "� .
SEQUENCE OF CONVERSION FROM SEDIMENT BASIN TO STORMWATER
CONTROL MEASURE
1� INSTALL POND BARREL, OUTLET STRUCTURE, EMBANKMENT ANID
ALL OTHER POND COMPONENTS.
2, CALL FOR SITE INSPECTION PRIOR TO BACKFILLING POND BARREL,
'
1 INSTALL TEMPORARY SKIMIMER TO OUTLET STRUCTURE,
4,. EXCAVATE POND TO TEMPORARY SKIMMER BASIN DIMENSIONS,
SEE EROSION CONTROL PLAN.
5� INSTALL BAFFLES AND OTHER TEMPORARY SKIMMER BASIN
COMPONENTS, SEE TEMPORARY SKIMMER BASIN DETAIL ...
6. REFER TO TEMPORARY SEDIMENT SKIMMER BASIN DETAIL FOR
ELEVATION OF SKIMMER CONNECTION.
7� SEE CONSTRUCTION SEQUENCE ON EROSION CONTROL PLAN FOR
INFORMATION,
8. ONCE SITE IS APPROVED, REMOVE TEMPORARY SKIMMER,
BAFFLES AND OTHER TEMPORARY COMPONENTS,
9, FILL HOLE IN OUTLET STRUCTURE FROM SKIMMER WITH
NON -SHRINK GROUT. PROVIDE PERMANENT WATERTIGHT SEAL.
10. EXCAVATE SEDIMENT AND GRADE TO FINAL CONTOURS, SEE
GRADING PLAN,
11, CONSTRUCT WET POND, STORMWATER CONTROL MEASURE AS
SHOWN ON THE DRAWINGS,,
AS -BUILT SURVEY REQUIREMENTS
NOTE: CONTRACTOR SHALL PROVIDE AS -BUILT TOPOGRAPHIC
SURVEY PERFORMED BY A PROFESSIONAL LAND SURVEYOR CERTIFYING
WET DETENTION POND AREA DIMENSIONS AND ELEVATIONS OF THE
FOLLOWING�:
1� TOPOGRAPHIC SURVEY OF THEWET POND AND EMBANKMENT
1 OUTLET S�TRUC7URE TOPS AND INVERTS
1 OUTLET STRUCTURE DIMENSIONS
4,. ORIFICE DIAMETERS
5. BARREL PIPE SIZES AND INVERTS
6, EMERGENCY SPILLWAY ELEVATION AND DIMENSIONS - --------------------------------------- I
OUTLET STRUCTURE NOTES
1, CAST -IN -PLACE CONCRETE RISERIS REQUIRED WITHOUT'
EXCEPTION,
2 ... CLASS "'A."' (3,000 PSI) CONCRETE TO, BE USED.
6 �, ALL, MORTOR JOINTS ARE 1/2" i 1/8"�
T. GROUT SHALL BE NON -SHRINK (ASTM-C1107),
8, ALL, STRUCTURES OVER 3'-6" IN D,EPTH TO BE PROVIDED WITH
STEPS i'l-2" ON CENTERS, STEPS SHALL BE IN ACCORDANCE WITH
STANDARD 840 ... 66.
9, LOCATE MANHOLE OVER STEPS,.
x
6-IN DUCTILE IRON DRAIN PIPE F
WITI .... I GATE VALVE AND HAND, . A�
11, ,4
� ,
WHEEL q � 11 - � .. . 11 � I
. 'd —
f: � -11, . A.
- �: "A - ,
I F
.,
CONCRETE
PIPE ANCHOR
PVC PRIMARY SPILLWAY
O�RIF�CE DIAMETER: 3.5-IN
24 .. . IN THICK CI .... . ASS B
RIIPRAP OVER, FILTER
FABRIC
100-YR STORMI ELEV 1,214. IS'
10-YR s ... roRm ELEV 1213. 1 V
2 ... . Yk STORM ELEV 1212�50'
I-YR STORM ELEV 121,2.33 . ........................ ��
11,11,11,111,111,111,'ll""I'll""I'll",'ll""I'll""I'll",'ll""'ll'','ll""IlI
TOP OF EMBANKMEN ... r ELEV:� 1216.00 ... rop, ELEV: 1215.50
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TOP El .... EV� 1215�00
6­FT WIDE ACCESS
PAD TO OUTLET
STRUCTURE 6-IN
8 E LOW VVE I R
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1
8 .... F
T WEIRWIDTH
- �
3
ill
1�17� SPILLWAY CREST ELEV:, 1215,00
:
Mist-Memil"Ifl�ill I i ioli � v&-wowep,
� Z ,
24 .... �N THICK Cl .... ASS B
RIPRAP OVER FILTER
FABMC
SEED & MUl .... . CH EMBANKMENT SEE SEEDING SCHEDI-Ill ..... E
(INS ... rALL SLOPE PRamcrm MATTING ON ALL SLOPES
STEEPER THAN 6: 1)
- I � ,, - ­ -1 11 ".- !, - , I I "I "I � ... -, �__ __
. , 11 - - , -_ `1��= — — — — — — — — — — — — — — ---�,,
PROVIDE 6' X 6" DEPRESSED AREA . 11 - " t �� - ,"I __'� . - - 1�_4'. ""L".-. 1!, all -Tff�tLff,d � `:--` EMERGENCY SPILLWAY CREST ELEV� 1215,00 *_� 3
INV�1214,,50 , I I I I - - Ill, -
:­ I - 1, - 71
2-F ... r BELOW PRINCIPAL SPILLWAY � - - 6-IN _____ -1,
,
PRIINCIPAL 11c , --4,-4 .� ,_1 .-, -_ '11 _�/
WITI .... IIIN AQUATIC BENCI .... 11 FOR I ­-
- .
� ,�, ,,'','''L,'',, .. .... j r__ wumunA� m� �, . 1- -,,.,-.-' - - z
ADEQUATE DRAINAGE — SPILLWAY ,�'j-, ., i� \1/ \�/ \1/ __� "., i,-.,, � I '" - -, - I- i ,
- " EXISTING DROP INLET
.0
I
,
4
r—
,
-
-
,-
'_
"�'�
'
\ \ PERMANENT POOL ELEV� 1210,50 V
,-=-
.... �
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"
1112111111
MAIN POOL
INV=12014,00
FORESAY
EMBANKMENT
�
TOP OF PERM, SEE). $TOR. ELEV� 1,2011,100
,, 11 .11,111.11,1111, "I'll, "I'll'', I'll. ­­­. 11 11
Ill
�. �.i i. BOT, OF PERM. S�ED, STOR, ELEV: 1203150 . . .
TOP OF PERM. SED STOR,
FOREBAY EX�T ommmm
4
ELEV� 1206.25
6" IMPERVIOUS FILL
LAYER UNDER ALL --- J
WATER SURFACES
__v SEASONAL HIGH WATER TABLE BELOW ELFV� 1192�010
, , , I _ , —, , , , ,
_
I '11 I NV_ 1204,00 _�
2 00
LI:V. 1 ol _
- 0 'o � . 0
0
- .. F V71 L23 5 .
)R - .1
X��
AQUA'rnc BENCH ELEVT 121 1,00
OUTSIDE EDGE OF AQUATIC BENCH IS
6-IN ABOVE PERMANENT POOL EILEV
WATER QLJAL�TY ORIFICES:
TWO (2)-12"' X 6" ORIFICES ON BOTH
SIDES WITH PEAK TRASH GUARDS
IINVERT ELIEVATIIONI 1212,25,'
I- I - - 4:.1 - , "
. �: ,, , ,, �o �
,, 4
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1
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CAST IN PLACE RISER IS
%
y . REQUIRED WITHOUT tZ
4
91�= EXCEPTION I
41
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v � . 11 .
..
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11 I
VA
4-FT
- - - - - - -
OUTI ..... ET
BARREL
916 .... LF 18-IN RCP
. �
&.411
­­`� �
- 11 ��& '.1
.1i
-
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I e
CONTRACTOR SHALL PROV0E
S ... I ... EP IIN ACCORDANCE WITHI
NCDOT STO�. 840.6,6, STEP'S
SHALL BE PLACED AT 16" O.C.
0 In 11 E _b I N A 1.1191#1 Ill 11.1 4
����
3
--,- I'l
TERMINATE 6-IIN IMPERVIOUS HILL AT
OUTSIDE EDGE OF AQUATIC SENCHI
6'WIDE AQUATIC BENCH
AROUND, MAIN POOL
--- 61 -71,
stal WKIL41:14111
=
PERMANENT POOL ELEV� 1210,50
MAIN POO� ... I
JS.Eb DETAIL ABOVEJ
,_ __
� .11
I-,' �l -1 -1
1-1 ,�l ENDCAP 1`1 'I-,
/1' "\
/ \­1
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/ "I'll", ",',,',',,""I'll � ...................... .......................................... I , \
/ - A 41, , . 4_� \
/ -1 4, . __ � 4 . \
,
/ "I'll, "I'l""I'll""I'll'll""I'll""I'll",lI "I'll, "I'l""I'll""I'll'll""I'll""I'llf 11 'A '' - . _� ANCHOR \
1, � DRAWDOWN
/ "I'll, "I'l""I'll""I'll'll""I'll""I'll",lI "I'll, ",',"",',,"",',I'll" ............. , 1� . , PIRE TO V4ALL \
/ 11 t 1 _�_ - ;& .1 \
10-IN - 11 � - ,.& I` " 11
/ "ll i - - a � . \
/ - 4"PVC \
/ Ill I �A . . . -.'A - . I \
,� ,, -'- . -
-
I , ,� 4,11 d " ;r . � 4 11 — PRIMARY �
1 4 ... . PVC TEE - � // SPILLWAY �
� INV= 1210.50 1
� V PERMI, POOL ELEV� 12,1,0.50 11 / I
-
1,
- I
......
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L��,��,_ll
,
Al —
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/
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1 , ni,_.__ I "
- t ll_�_J_ L/comill)ACTED -e_ �, ZCOMPACTED / , ,�,
., �1_ 11 .---
".. --- — TWO (2),-12"' X 6" ORIFICES ON BOTH--;� '-- I �_ SELEC �-� -, �- \ \ ,
w*qr--,-,__,//-
�l , :� ,:J� , u- SELECI FILL �:%,� �, "r FILL I -
I : . ,,-' V4 - ?. � L11
. I - .1
SIIDES WITH PEAK TRASH GUARDS m .­� (� `__-__
'-A 11-11, I . ;l / / �
OUTI .... ET STRUCTURE "', ,�L, � "", �ilq
, I . ,
­��. '..", INVERT ELEVA ... rII0N, '1212-25' ;"- " - - , -� , \ ---,,---
1.11 , . - i �,.' -
r'" I .... . �11 - . __�,___, 7
, . '. � so, , .. 7.; .!-
",',""I'll, INV::::::::1210 r7 - - - -- - - - - -- - - - - ..... - - ----. _,=_�:�� - -, "- - - - "-, - - ..-L �� ...... --.w = , " `1
." - _. "- - - - - - - ... :::�=­_ _ - - - ,- "- - - ,- "- - -
.. . +� I�
I'� ; BARREL OU7LET BARREL: 96 ... LF 18" RCP @ % SLOPE (ASTM C .... 765, CLASS Ill') GASKETED JOINT PIPE MANUFAM UREDWITHOUT LTT HOLES. GASKEIED - ...... - - r-
Ell !; WV=1202,00 JOINT MPE SHALl .... REWRAPPEII A DOUBLE LAYER OP NO,N�WOVEN FILTER FABRIC ON THE OUTSIDE OF THE RPE AT EACH JOIN r
I I
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SCHEDULE A PRE -INSTALLATION
CONFERENCE PRIOR TO
CONSTRUCTION OF THE
STORMIWATE:R CONTROL MEASUIR,E
FES WICURTMN WALL OUTLE7
M, Elcv, J W9,50
PER N(MOT STO DWG 31002
Z_
TfFCORTAW WALL MTO
F,FS VA PPDXY COATFO
REBAR AM) EPDXY MIX
OUTJ .... ETPROTECTfON
_m___'
2& SEEGRAMNG PLAN.
.
,
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DETENTION BASIN MIAIN"rENANCE
SCHEDULE
DESCRIPTION
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METII .... IOD
FREQUENCY
SEASON
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EMBANKMENT
INSPECT AND REPAIR
VJSLAL
ONCE PER YEAR
ALL
EROSION/ ANIMAL INESTINGS
INSPECT AND RESEED
VISLJIAL
WHENEVER NEEDED
ALL
GRASS COVERAGE
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OUITI .... ET STRUCTURE
DEBRIS / OBSTRUCTIONS
BY HAND,
WHENEVER NEEDED
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OPERATE POND DRAIN VALVE
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ONCE PER YEAR
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EROSION A,T OUTLET DISCHARGE
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SEDIMENT / DEBRIS BY I ... JAND, ONCE PER YEAR ALL
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REMO�VE TRASH BY HAND, WHENEVER NEEDED ALL
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CONTRACTOR SHAU ... . BE RESPONSIBLE FOR MAIN7ENANCE UNTIL PRO]ECT CLOSE OUT
AT WHICH [ME OWNER WILI ..... ASSUME MAINTENANCE RESPON51811 ..... ITY,
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DAM EMBANKMENT CONSTRUCTION STANDARDS
1� CONTROLLED FILL,AS SPECIFIED BY THE GEOTECHNICAL ENGINEER, IN THE D�AM EMBANKMENT SHALL BE PLACED IN 6 ..... INCH LOOSE LAYERS (3: .... . INCH LOOSE, LAYERS WITHIN 3, ..... FEET OF
EITHER SIDE OF TI .... iE PRINCIPALSPILLWAY PIPE TO A DEPTII .... I OF 2-FEET ,OVER TIi .... IE 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 DEN'SfTY, S�OILS 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 DENSI,T�ES, 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 FILI ..... LAYER THAT IS SMOOTH DRUM R01 ..... LED TO REDUCE MOISTURE PENIETRATION DURING A STORM EVENT SHAU ...... BE PROPERLY SCARIFTED PRIOR TO THE PLACEMENT OF THE NEXT SOD .....
LIFI%
5, SURFACE WATER AND STREAM FLOW SHALL BE CONTINUOUSLY CONTROLLED THROUGHOUT CONSTRUCTION AND THE PLACEMENT OF CONTROLLED FILL,
6, FOUNDATION AREAS MAY REQUIRE LINDERCU ... FrING OF COMPRESSIBLE ANWOR UNSUI ... rABLE SOILS, IN ADDI ... rm ... FO ... FHA ... r I NDICA ... rED ON ... FHE PLANS, ALL SUCH UNDERCUT ... rING SHALL BE
PERFORMED AT THE DISCRETION OF THE GEOTECHNICAL ENGINEER AND SHALL BE MONITORED AND DOCUMENTED. IN NO CASE SHALL THERE HE AN ATTEMPT TO STABILIZE ANY PORTIONS
OF THE FOUNDATION SOILS WITH CRUSHED STONE.
'7', TREA ... rME�N .... I ... OF SEEPAGE AREAS, SUBGRADE PREPARATION, FOUNDA .... 1 ... ]ON DEWA ... VERING AND ROCK FOUNDATION PREPARA ... n0N (1,E,, TREATMENT WI ... TH SLUSH GROU ... FING, DEN ... rAL CONCRE ... HE,
'AL ENGINEER.
ETC.) MAY BE REQUIRED AT THE DISCRETION OF THE GECTIECHNICAL ENGINEER, ALL SUCH ACTIVITIES SHALL BE CLOSELY MONITORED AND, DOCUMENTED BYTHE GEOTECHNIC
8, FILL ADJACENT TO THE RISER AND, PRINCIPAL SPILLWAY PIPE SHALL BE PLACED SO THAT LIFTS ARE AT THE SAME LEVEL ON BOTH SIDES OFTHE STRUCTURES,
9, EAR ... 1 .... HWORK COMPAJ: ... riCIN WI .... I .. . HIN 3-FEE ... r OF ANY STRUCTURES SHALL BE ACCOMPLISHED BY MIEANS OF HAND ... rAMPERS, MANUALLY DIREC ... rED POWER ... rAMPERS OR PLA ... rE COMPACTORS OR
MINIATURE SELF-PROPELLED, ROLLERS.
10. COMPACTION BY MEANS OF DROP WEIGHTS, FROM A CRANE OR HOIST SHALL NOT BE PERMITTED.
1 1. HEAVY EQUIPMENT SHALL NOT BE ALLOWED TO PASS OVER CAST-IN-P�LACE STRUCTURES (INCLUDING THE CRADLE) UINTIL ADEQUATE CURING TIME HAS ELAPSED.
12., TO RE-ESTABLfSH VEGETATION AFTER CONSTRUCTION, A 2- TO 3-INCH LAYER OF TOPSOIL SHALL BE PLACED ON THIE DISTURBED EMBANKMENT SURFACE ANDTHE AREA SEEDED AND
MULCI .... ]ED O�R I ..... IYD,ROSEEDED.
TESTING, OBSERVATION, AND CERTIFICATION
1, TESTS OF THE DEGREE (%) OF COMPACTION OF THE PLACED FILL IN THE DAM SHALL BE P'ERFORMED AS A PART OF THE PERMITTEE'S NORMAL QUALITY CONTROL PROGRAM FORTHE
CONSTRUCTION OF THE DAIMI. TESTS SHALL BE CONDUCTED CONCURRENT WITH THE INSTALLATION OF THE COMPACTED FILII ..... AND THE CONTRACTOR SHALI ..... COORDINATE THE CONSTRUCTION
OF THE DAM SO THAT'THE TESTING CAN BE COMPLETED. SHOULD THE RESULTS OF THE TESTS, INDICATE THAT THE SPECIFIED DEGREE OF COMPACTION HAS NOT' BEEN 067AJNED� THE
PORTIONS OF THE D'AM REPRESENTED BYSUCH TESTS SHALL BE REWORKED, OR REBUILT, ALL PORTIONS OF THE DAM SHALL ACHIEVE THE SPECIFIED MINIMUM DEGREE OF COMPACTION.
2, CONSI ... RUC ... 1'10N OF CLASS A, 6 AND C DAM EMBANKIMEN ... rS SHALL BE DONE UNDER .... I ... HE OBSERVA .... I ... ION OF AQIJAL[FlElD GEO .... � ... ECHNICAL ENGINEE�, WHIO 15 REGISTERED, AS A PROFESSIONAL
ENGINEER IN THE STATE OF NORTH CAROLINA. THE GEOTECHNICAL ENGINEER MUST HAVE EXPERIENCE IN THE DESIGN AND, CONSTRUCTION MON ITORI.NiG OF DAMS OF THE S�IZE AND SCOPE
COVERED BY THESE STANDARDS AND GUIDELINES,
3, ON CLASS A, 13, AND C DAMS (Wl ... rH I ... HE EXCERI ... ION OF DE ... rEN1 ... ION ONLY CLASS C DAMS ... FHA ... r COLLEC ... r DRAINAGE FROM AN AREA OF 25-ACRES OR. LESS,),, THE GEOTECHNICAL ENGINEER,
-OFF TRENCH, INSTALLATION OF
AS DEFINED ABOVE, SHALL OBSERVE ALL ASPECTS OF THE CONSTRUCTTON ,OF THE DAM (I � E ,, PREPARATION ,OF THE FOUINDATION, INSTALLATION OF THE CUT
THE PRINCIPAI ...... SPILII ..... WAY PIPE, INSTAI ..... LATION OF THE INTERNAL DRAINAGE, INSTALI ...... ATION OF COMPACTED FILI ...... , ETC,). THIE FREQUENCY OF OBSERVATION AND TESTING MIUST BE
ION,
SUFFICIENT FOR THE GEOTECHNICAL ENGINEER (OR THE DESIGN ENGINEER ON CLASS D DAMS, AND CLASS C, DETENTION ONLY, DAMS) TO, STATE,, IN HISMER PROFESSIONAL �ORIN
THAT THE SPECIFIC ITEMS OBSERVED AND TESTED WERE INSTALLED IN ACCORDANCE WITH THE APPROVED CONSTRUCTION DRAWINGS AND SPECIFICATIONS. �
6-FT WIDE ACCESS
PAD TO OUTLET
S�RUCTURE 6-IN
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Na Date
COP #27
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2,021 JULY,09
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2,021 AUG 13
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Project Number 1 71 1 -B
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Date: 2021 AUG 13
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She!el Number ...
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