SW3230302_Plansheet - SCM Detail_20240417

100 YR ELEV:559.48'
om .
zaw WET POND OPERATION AND PEAKED TRASH RACK WITH ANTI VORTEX PLATE
oQQ TOP OF BOX ELEV:557.50
MAINTENANCE PROVISIONS PAINTED BLACK I I �WK
<a� 2:1 SLOPE, WITH =2'x T HINGED HATCH �DICKSON
F J ALIGN WITH STEPS INSIDE TOP OF BOX ELEV:557.50
=wHow to remediate the How to remediate theSECURE HATCH WITH CHAIN &LOCK t' I I communityinfrastructure consultants
00m 'CONTRACTOR SHALL PROVIDE& INCLUDE WITH y�
s N The entire SCM Trashldebris is present. Remove the trash/debris. An annual inspection by an \ 1213 W. MOREH EAD STREET
appropriateprofessionalsh-. Makeall neededmpairs SHOP DRAWING SUBMITTAL) x'� 2'X6"WEIR ELEV:557.00
ozw that theembankmentneeds immediately. I SUITE 30O
u, -o Regrade the scilifnecessaryto repair. mod' 4"WQ DRAW DOWN 555.50' CHARLOTTE, NC 28208
z0. remove the gully,plant ground (SEE DETAIL THIS SHEET)
z Areas of bare soil and/or I
F�0 The perimeter of the wet pond erosive ullies have formed. ever and water until it is
z o g established. Provide lime and Clean out the outlet device TOP OF BOX ELEV.557.50 1"RUNOFF VOLUME (t)[phone]
ozw dispose of any sediment in a 'I
0 o m a one-time fertilizer application. Clogging has occurred.
m Y J location where it will not cause ��.� I ELEV.556.9' I (f7(704) 334-0078
=0 a The outlet device impacts to streams or the SCM y •
I E m Unclog the pips_ Dispose of
0 Y The inlet pipe is clogged(if the sediment in a location WEIR I N BOX
w3w applicable), where it will not cause impacts Repair or replacelheoutlet I I WWW.WKDICKSON.COM
j a The outlet device is damaged device. "a'�y
¢oo
ostreamsorthescM. 2.0'WIDEX6"FROM TOP �f'y�-i;: STEPS 1'-2"O/C
0Z< 2 ALIGN W/OPENING
oNw The inlet pipe is cracked or Weeds or volunteer trees are Remove the weeds or trees. @ELEV.557.00 p DRAINAGE STRUCTURE STEPS
I_z. otherwise damaged(if Repair or replace the pipe. growing on the mat.
0 0 a The inlet device applicable).
Floating wetland island(if
""' NC LICENSE NO.F 0374
o z z applicable)
0 w 15 The anchor cable is damaged, Restore the anchor cable to its
aGJ Regrade the sale ifnecessary disconnected or missing. design state. PRECAST CONCRETE STRUCTURE
a 3 z Erosion is occurring in the and provide erosion control
devi es such as reinforced turf TINDALL UV4848 OR EQUAL /�/' \�� D
I I 36"R)RCP I _
o D c7 Swale(if applicable). Erosion or other si ns of Repair the damage and / / T ••••••.•.
woo matting ouch
g p g 48"X48"INSIDEDIMENSIONSO-RINGJTS. "������ �0o erosion roblems. damage have occurred at the improve the flow dissipation , \ \ � /'�m12p outlet. structure (MIN.6"WALL THICKNESS) ) \ \ j I I p`�.f\A Search for the source of the The receiving water
8"DEWATERING PLUG VALVE 550'sediment and remedy the Discharges from the wet pond I t I I I36"O RCP Q ESSSediment has accumulated to aare causin erosion or Contact the local NCDEQ i ° ° 4Fw depth greater than the original problemif possible. Remove g "' � I I THE VALVE SHALL BE AN M&H STYLE the sediment and dispose of it sedimentation in the receiving Regional Office. 6"PVC 4"ORIFICE , 820 X-CENTRIC VALVE OR APPROVED °a¢ design depth for sediment water.0¢ in a location where it will no DRAWDOWN „°' � \� / / 36" RCP\\
awstorage. cause impacts tostreamsor EQUAL.THIS VALVE SHALL BE INcioz cheforebay the SCM. INVERT=555.50' � . . ° .�, / $ az=w '. ACCORDANCE WITH AWWA C-504 SEC a. 36"O RCP OUTLET PIPE °. a. 044570aZ SEE TURNDOWN PVC .° c 5.5,AND SHALL BE OPERABLE FROM INV. ELEV:550.00 ° °
SEDIMENT BASIN CONVERSION NOTE: - p Fti Provide additional erosion DETAIL THIS SHEET) '� "'• a a` ° `
�;;. �>� THE TOP OF THE OUTLET USE WATER TIGHT BOOT TO SEAL PIPE °.a. / GINS 0 protection such as reinforced ALL AREAS ABOVE THE PERMANENT POOL SHALL BE PREPARED&SEEDED TO PERMANENT GROUND COVER SPECFICATIONS. •-4 a • !�
owm Erosion has occurred. turf matting orriprapifneeded e •:•a `'' STRUCTURE VIAAHANDWHEEL PONDA CONNECTION ASTM s , a ' .° /�
'D, opraventPot°rearnsi°" -. (LINKSEAL OR APPROVED EQUIVALENT) $ °•�. I SU
l0 LL problems. THE PERMANENT WET POND SHALL NOT BE CONSTRUCTED UNTIL THE CONTRIBUTING DRAINAGE AREA IS STABILIZED.ANY SEDIMENT THAT ° ,f .`9 4.., •4q� Opo`,
E.0 ACCUMULATES WITHIN THE POND SHALL BE REMOVED AND THE FINAL GRADE REESTABLISHED TO THE PROPOSED CONTOURS SHOWN. °
SIDE ELEVATION •••.........0
YO z Remove the weeds,preferably • . °� ,° - • 5'x 5'x 14"CONCRETE POND A OF STRUCTURE
��� byhand If pesticide is used, 8"DEWATERING • NOT TO SCALE Mar 28 2024 5:42 PM
Weeds are present. THE PROPOSED STORMWATER MANAGEMENT BMP IS TO BE CONVERTED FROM SEDIMENT AND EROSION CONTROL BASINS. THIS CONVERSION r
cod wipe it on the plants rather than 'a. . .�!' '°' ANTI-FLOATATION BLOCK FRONT ELEVATION
z 0 spraying. SHOULD BE COMPLETED AFTER THE ENTIRE DRAINAGE AREA IS STABILIZED AND APPROVAL GIVEN FOR THE LOCAL&STATE AUTHORITY. DEVICE 4'
= w
NOTE. PROFESSIONAL SEAL
rya= INVERT=550.0' "
a Q Best professional practices prune according to best THE CONVERSION TO A PERMANENT STORMWATER BMP SHALL BE ACCOMPLISHED BY REGRADING THE BASIN CONTOURS TO THOSE SHOWN ON a ° _:°+•; .,,:,•a ` °. °'°: •.. .� NOT TO SCALE
goy show that pruning is needed to professional practices. THE PLAN AND INSTALLING FILTER MEDIA/UNDERDRAINPIPING. PROVIDE TRASH RACKS FOR ALL OPENINGS ON THE RISER. TYPICALLY THESE ARE REBAR
maintain optimal plant health. •'a °
ANY SEDIMENT LADEN WATER WITHIN THE SEDIMENT BASIN SHALL BE DRAWN DOWN BY USE OF PUMPS AND DISCHARGES THROUGH A'BLADDER' • ° WELDED TO ANGLE IRON. TRASH RACKS SHOULD PROJECT OUT 6" FROM FACE OF RISER AND >_
Determine the source of the • •.
problem: soils,hydrology, TYPE SYSTEM OR DISPOSED OF OFFSITE IN AN APPROVED SYSTEM. "4-1 •` a: • EXTEND 6" BELOW WEIR CREST OPENINGS. MAX SPACING BETWEEN BARS IS 3" 00
disease,etc. Remedy the
Plants are dead,diseased or problem and replace plants.
The vegetated shelf dying_ Provide a one-time fertilizer ALL SEDIMENT REMOVED SHALL BE PLACED IN A DESIGNATED SPOIL PILE AND ADEQUATELY PROTECTED WITH EROSION CONTROL MEASURES
application t,ifa.establish
est AND PERMANENTLY STABILIZED WITH PERMANENT SEEDING. WET POND OUTLET STRUCTURE
ground cover if a sail lest
indicates it is necessary.
CONTRACTOR IS RESPONSIBLE FOR SUBMITTING CITY OF MONROE FORMS 1-04A(PRE-CONSTRUCTION CERTIFICATION FORM- NOT TO SCALE
Remove the weeds,preferably POST-CONSTRUCTION STORMWATER BMP)AND 1-04B(FINAL CONSTRUCTION FORM-POST CONSTRUCTION STORMWATER BMP).
Weeds are present. by hand. If pesticide is used,
wipe it on the plants rather than
spraying.
Search for the source of the
sediment and remedy the
Sediment has accumulated to a problem if possible. Remove 562 562
depth greater than the original the sediment and dispose of it TOP OF DAM
design sediment storage depth. in a location where it will not
cause impacts to streams or ELEVATION=560.50
the SCM. 561 - 561
The main treatment area
Consult a professional to
Algal growth avers over 50% EMERGENCY SPILLWAY
of the area. remove and control the algal _ -
growth. 560 - -ELEVATION=559.00 100-YR 6-HR PEAK STAGE- 4 50 - 560
(SEE PLAN FOR LOCATION) O
Cattails,phragmiles or other Reprove the plants by wiping 25
invasive plants cover 50%of them with pesticide(do not 559 - 50-YR 6-HR PEAK STAGE=559.26 10 - 559
me basin surface. Spray)' 25-YR 6-HR PEAK STAGE =558.93
Shrubs have started to grow°n Remove shrubs immediately. O 10-YR 6-H R PEAK STAGE=558.60 1
the embankment.
558 1YR-24HR PEAK STAGE=557.90 558
Evidence of muskrat or beaver Consult a professional to mV 6' LITORAL TOP OF BOX:557.50 1 n 0 O
The embankment remove muskrats or beavers Q' SHELF H
activdy is present. and repair any holes or erosion. 557 - y y 1" RUNOFF VOLUME (51,159 CF) = 556.84 - 557 O a
4-6"TOPSOIL U oc
Ae tree mhas nkmenstarted to grow on Consult s dam safety specialist 556 TOP OF LITTORAL SHELF=556.0 - 556 Ir W
the embankment. to remove the tree_
PERMANENT POOL ELEVATION=555.50 Z W
-- -- --- -------------------------------------------------------------------------------------- o
PRECAST CONCRETE BOX BOTTOM OF LITTORAL SHELF=555.0 0
555 - -TYffDALL 48"�X 487MISIDT DIMS - 555 W
SEE DETAIL,THIS SHEET WATER QUALITY DRAWDOWN /N10_7
W
554 -STRUCTURE 554 LU
SCHEDULE 40 PVC
-(SEE DETAIL,THIS SHEET) 553
553 - FOREBAY
MAIN POND
552 552
36"RCP 61 LF OF 48"RCP
(O-RING JOINTS)
TO DI Al
551 - - 36" RCP- O-RING 551
INV. = 550.0
.-�
550 (SEDIMENT) O(SED ENT) 550
SEDIMENT)
BOTTOM=549.0 BOTTOM=549.0
549 - 549
ANTI-SEECOLLARS TO O PROJECT 24COLLARS(2 I"NFROM WET DETENTION POND SECTION
OUTSIDE OF PIPE.MAINTAIN 24"
SPACING FROM PIPE JOINTS. NOT TO SCALE
(SEE DETAIL,THIS SHEET
Q
0
--I 12 I--
z
1 \ \ \ \ \\ \ \\\ \ \
/ 061 °D�- / �S.S SSA SS PE:56
a � 39 -I ° BARREL d°a • I °.'
/ \
\ \ \\ \ \ 2,240 SQ.FT mod.
4
PAD:569.11 PAD: \ �\ \ \ \I \ GPE:56 THE FOLLOWING PARAMETERS APPLY TO MATERIALS USED TO CONSTRUCT EMBANKMENTS: =I °° '
d
4a,
GPE:56 �0 BORROW MATERIAL SHALL BE CLASSIFIED AS ML, MH, SC, SM, CL OR CH SOILS ACCORDING TO THE
F=;4
/ PAD:567.83 / / o a _ o '\ \ \ / Z / \� \ \ \ \ UNIFIED SOIL CLASSIFICATION SYSTEM (ASTM D2487) OR ANY MIXTURE OF THESE SOILS. NOTES:
/ M ` a ° °°o�cr \ \\ \ \ `` \ '=�'' �,1s • BORROW MATERIALS SHALL HAVE A LIQUID LIMIT LL BETWEEN 40 AND 60 AND A PLASTICITY INDEX PI USE SIDE WALLS AND BOTTOM OF TRENCH AS FORM O
7 �/ S6,y / �.�� �D:ssals/ \ \ /� ]GPICOMPACT OVER-EXCAVATION TO 95% DENSITY PER
/ BETWEEN 15 AND 30 (ASTM D4318).
s % "' o� `�� - - - - - \ \ / // \ I\\ i \ �C \ / / • MATERIALS SHALL BE FREE OF TOPSOIL, ORGANIC MATERIAL, ROOTS, STUMPS, BRUSH, ROCKS LARGER ASTM D-698) N
PAD:566.63 . �.
THAN 3 INCHES, SUBSOIL, DEBRIS, VEGETATION, AND OTHER FOREIGN MATTER. CONCRETE SHALL BE 3,000-PSI C\1
�_�_ - - / - - / - ' \ I \ \ 3 \ \ / / \ \\ �� \ \ \\ \ • ALL MATERIAL CLODS WILL BE BROKEN DOWN WITH TILLERS AND/OR DISCS TO PROVIDE A HOMOGENEOUS T
SOIL THAT IS FREE OF CLAY CLODS GREATER THAN 3 INCHES IN DIAMETER. CONCRETE ANTI-SEEP COLLARS
STABILIZE BASIN (TOP,
/ \ I \_ TYPICAL SECTION
BOTTOM AND SIDES)WITH �, �`' f \ �J,J U a
\ j PAD:56 O A CLEAN WASHED SAND \ \ I \ \ 1 �\ �o° NOT TO SCALE cn J T
- I I PAD:567.88� 6" PVC SCREW bi
BASE BERMUDA SOD (TYP) �,�° \ \\ \ \ \�\°=\ _ TYPE PLUG Q Q w
FOREBAY BERM \
I TOP: 555 i \ 560- \ \ Q 0 T
I / WIDTH: 50' � � � - \ \ \ �� / � � ch �p°� \ \ � \� o z H - N
NCDOT CLASS 'B' RIPRAP ON / ° \ / \ / \\ - )\ \\\\�56 \'' 6" PVC TEE 6 PVC O ^ _j LU U J
/\ GEOTEXTILE (MIRAFI FILTER / \ \ �/ \ \\ O ~ W Z Q
J ¢ � °� aow w
WEAVE 700 OR APPROVED Q
/ 48" RCP / _ \ EQUIVALENT) / \ \ ` _ \\ / _ _ / \ MAINTAIN 10"D50 RIPRAP USED J L U Cc r Q
O-RING PIPE \ - / \ \ WS TOP OF SPILLWAY DURING EROSION CONTROL PHASES > J LL W r
565 i ". _ - \\ p/ \ \� PERM. POOL ELEV: 555.50 @ ELEV.559.00 O Z J
TOP OF DAM � WCl) W Q m
@ ELEV.560.50 W U =
' - 560 - J - \ \ - \ \ INSTALL FILTER FABRIC 3:1 20' 3:1 O N U
_ _ Z UNDER RIPRAP z - f�
\ - - _ _ BMP#A(WET POND) - ` , \ 2 O Q = Eo s_ � BMP RISER STRUCTURE �
s s° s55 DRAINAGE AREA: ±28.01 ACRES I \ U c j
ss TOP OF BERM: ±660.50 \ - - \�S o I LO
PROP. 6'VINYL COATED \ s� �° s50- f PERMANENT POOL: ±655.50 - _ - - - \ - \ \ 'SS'
CHAIN LINK FENCE AROUND ss ss 549 to - - BOTTOM OF BASIN: ±649.00 - - ANTI-SEEP COLLAR (TYP.) L)
PERIMETER OF WET POND � � ` - - - - o to - - - - - - - - - - �- \ 1I D
\ 549 550 - - � \\ 6" PVC CAP WITH EMERGENCY SPILLWAY ELEVATION rr
\ 555 - - - - - - - - - 4"ORIFICE NOT TO SCALE
- _ RIP-RAP APRON WATER QUALITY z w w
RIP-RAP APRON _ - - - - - sss I WIDTH AT OUTLET: 9' (MIN)
_ APRON LENGTH: 30' (MIN) DRAW DOWN STRUCTURE @ ELEV.560.50 0 Q
WIDTH AT OUTLET: 12' (MIN) \ - - 560 - _ TOP OF DAM
APRON LENGTH: 26' (MIN) \ APRON AT END: 33' (MIN.) Z
APRON AT END: 30' (MIN.) \ 560 560 D50: 10" NOT TO SCALE V
D50: 11"; D MAX:16" - - / THICKNESS: 22" (MIN) TOP OF SPILLWAY MAINTAIN 10"D50 RIPRAP USED W Z
THICKNESS: 24" (MIN) - - \ - 56� @ ELEV.559.00 DURING EROSION CONTROL PHASES 3
/ �\ OOLL
-
_ -550 \ DIRECTION OF 3 `� 3
� FLOW 1 - _ � O
PROPOSED EMERGENCY ,� I I I 1 PROJ. MGR.: ETS
SPILLWAY(ELV. 559.0) -�� � � � - I �� - DESIGN BY: ETS
DRAWN BY: JCR
_ PROJ. DATE: OCT. 2023
DRAWING NUMBER:
SECTION THROUGH SPILLWAY
NOT TO SCALE
PROJECT B NDARY � - / - - - - � z BOUNDARY /
C407-R
�\ - 4
TYP. - /
( ) � � 0 0 4 0 80
\� IMPORTANT NOTE TO CONTRACTOR WKD PROJ. NO.:
_ AS-BUILTS MUST BE APPROVED BEFORE ISSUANCE OF FINAL PLAT J
\ SCALE. 1 -40 W 2023094600CL
\ AND/OR CERTIFICATE OF OCCUPANCY (C.O.). CIE

OUTLET STRUCTURE
haw SAND FILTER OPERATION& MAINTENANCE PLAN 48"x 48"CONCRETE STRUCTURE NOTE:
a°a TOP: 578.0' pa
<a< SAND FILTER MAINTENANCE IS THE RESPONSIBILITY OF THE TENANT AND/OR IT'S DESIGNATED PROPERTY INV. OUT: 574.4' (24" RCP) INSTALL 3"OF ALL SLOPES DRAINING TO SAND FILTER AREAS SHALL BE STABILIZED PER THE NORTH CAROLINA STATE EROSION DICKSON
MANAGEMENT ASSOCIATION. WASHED#3 OR CONTROL & SEDIMENT CONTROL PLANNING & DESIGN MANUAL BEFORE MEDIA IS PLACED.
IMPORTANT MAINTENANCE PROCEDURES: TOP OF DAM #4 CRUSHED communityinfrastructure consultants
oaw ELEV: 581.0' STONE OVER
,ao THE DRAINAGE AREA WILL BE CAREFULLY MANAGED TO REDUCE SEDIMENT LOAD TO THE SAND FILTER. 3:1 SIDE SLOPES FILTER MEDIA CLEANOUT DRAINAGE AREA MUST BE STABILIZED BEFORE FILTRATION CONTROLS & FILTER MEDIA ARE INSTALLED. ANY SILT 1213 W. MOREHEAD STREET
�� TOP OF BERM: 578.0 THAT ENTERS THE FACILITY SHALL BE REMOVED BY THE CONTRACTOR AND DISPOSED OF OFFSITE.
o z w THE SEDIMENTATION CHAMBER OR FOREBAY WILL BE CLEANED OUT WHENEVER SEDIMENT DEPTH EXCEEDS SIX (TYPICAL AT ALL BENDS, SUITE 300
INCHES ONCE AYEAR,SAND MEDIA WILL BE SKIMMED. If 6" ABOVE GROUND SECURED CHARLOTTE, NC 28208
Fro THE SAND FILTER MEDIA WILL BE REPLACED WHENEVER IT FAILS TO FUNCTION PROPERLY AFTER MAINTENANCE_ 581 EMERGENCY SPILLWAY WITH WATER TIGHT CAP) 581 (t)[phone]
00.m THE SAND FILTER WILL BE INSPECTED BY A PROFESSIONAL ANNUALY AND WITHIN 24 HOURS AFTER EVERY STORM ELEVATION =579.00 DAM (fJ(704) 334-0078
=o¢ EVENT GREATER THAN 1.0 INCHES. RECORDS OF OPERATION AND MAINTENANCE W21LL BE KEPT IN A KNOWN SET — - —
oY J LOCATION AND WILL BE AVAILABLE UPON REQUEST. 580 (SEE PLAN FOR LOCATION) 580
�a� INSPECTION ACTIVITIES SHALL BE PERFORMED AS FOLLOWS: ANY PROBLEMS THAT ARE FOUND SHALL BE REPAIRED 579 _ 100YR-6HR PEAK STAGE579.33' 25 50 100 _ SEDIMENT BASIN CONVERSION NOTE: WWW.WKDICKSON.COM
a z IMMEDIATLEY. 1O 579
Zwa 50YR-6HR PEAK STAGE= 578.73 25YR-6HR PEAK STAGE=578.51
a.� ANTI-SEEP COLLAR TYP. ALL AREAS ABOVE THE PERMANENT POOL SHALL BE PREPARED & SEEDED TO PERMANENT GROUND COVER NC LICENSE NO.F-0374
10YR-6HR PEAK STAGE= 578.27 SPECFICATIONS.
S o Ff BMP ELEMENT: POTENTIAL PROBLEM: HOW I WILL REMEDIATE THE PROBLEM: 578 `-"— ' S78
o,z ENTIRE BMP TRASH DEBRIS PRESENT REMOVE THE TRASH/DEBRIS 1
a k ti ADJACENT PAVEMENT SEDIMENT IS PRESENT ON THE REGRADE THE SOIL IF NECESSARY TO 577 _ SAND_ _ —,-'� 3— — 577
z (IF APPLICABLE) PAVEMENT SURFACE REMOVE THE GULLY,AND THEN PLANT A •\~� 1�I
FILTER r� FOREBAY THE PERMANENT SAND FILTER SHALL NOT BE CONSTRUCTED UNTIL THE CONTRIBUTING DRAINAGE AREA IS
o F Hy GROUND COVER AND WATER UNTIL IT IS
>00 ESTABLISHED.PROVIDE LIME AND A 576 - �- 1"WQ PEAK STAGE(9,843 cf)=576.12— 576 STABILIZED. ANY SEDIMENT THAT ACCUMULATES WITHIN THE POND SHALL BE REMOVED AND THE FINAL GRADE ,,o�""���CA "°•o,,%
m z ONE-TIME FERTILIZER APPLICATION. { •` '�N RO
Q REESTABLISHED TO THE PROPOSED CONTOURS SHOWN.
VEGETATION IS TOO SHORT OR TOO MAINTAIN VEGETATION AT AN
i a o LONG. APPROPRIATE HEIGHT. 575 — — 575 •��',O OFES`S�O�L
Z
�ZY "Mw "z'oF CONDITIONED SOI� ", THE PROPOSED STORMWATER MANAGEMENT BMP IS TO BE CONVERTED FROM SEDIMENT AND EROSION 2� �
FLOW DIVERSION STRUCTURE THE STRUCTURE IS CLOGGED. UNCLOG THE CONVEYANCE AND 574 (MEDIUM AGGREGATE CONCRETE :..' — — 574 $
<�� DISPOSE OF ANY SEDIMENT OFFSITE. SA CONTROL BASINS. THIS CONVERSION SHOULD BE COMPLETED AFTER THE ENTIRE DRAINAGE AREA IS STABILIZED
?�w THE STRUCTURE IS DAMAGED. MAKE ANY NECESSARY REPAIRS OR 1 AND APPROVAL GIVEN FOR THE LOCAL & STATE AUTHORITY. w 0 0
4457
o z D REPLACE IF DAMAGE IS TOO LARGE FOR 573 - 573 �NGINE��
Uzo INV.OF 24"RCP OUTLET %��
,2 o REPAIR.
�.= FOREBAY OR PRETREATMENT SEDIMENT HAS ACCUMULATED TO SEARCH FOR THE SOURCE OF THE — - @ ELEV.574.4 — - _ THE CONVERSION TO A PERMANENT STORMWATER BMP SHALL BE ACCOMPLISHED BY REGRADING THE BASIN
Q a Q AREA DEPTH OF GREATER THAN SIX SEDIMENT AND REMEDY THE PROBLEM IF 572 CLASS B RIPRAP BERM FACED 572
INCHES. POSSIBLE.REMOVE THE SEDIMENT AND WITH 457 WASHED STONE CONTOURS TO THOSE SHOWN ON THE PLAN AND INSTALLING FILTER MEDIA/UNDERDRAIN PIPING.
YN< sTABIuzEOR DISPOSE OFIrINA 571 — — — — (3:1 SIDE SLOPES) 571 Mar 28 2024 5:42 PM
LOCATION WHERE IT WILL NOT CAUSE
1a IMPACTS TO STREAMS OR THE BMP. PERMEABLE NON-WOVEN ANY SEDIMENT LADEN WATER WITHIN THE SEDIMENT BASIN SHALL BE DRAWN DOWN BY USE OF PUMPS AND
�a, EROSION HAS OCCURRED. PROVIDE ADDITIONAL EROSION 570 FILTER FABRIC ABOVE,BELOW — 6" PVC DRAIN 1% SLOPE 570 DISCHARGES THROUGH A'BLADDER'TYPE SYSTEM OR DISPOSED OF OFFSITE IN AN APPROVED SYSTEM. PROFESSIONAL SEAL
awe PROTECTION SUCH AS REINFORCED &SIDES OF SAND LAYER (2 PER RIP-RAP SECTION OF
a o TURF MATTING OR RIPRAP IF NEEDED
TO PREVENT FUTURE EROSION 569 SHWT NOT PRESENT PER REPORT FROM BERM-SEE PLAN VIEW) 569 ALL SEDIMENT REMOVED SHALL BE PLACED IN A DESIGNATED SPOIL PILE AND ADEQUATELY PROTECTED WITH
PROBLEMS.
WEEDS ARE PRESENT. REMOVE THE WEEDS,PREFERABLY BY NOTE: NEWTECH ENGINEERING, PLLC DATED 12/18/22 6" MIN. UNDERDRAIN GRAVEL BED EROSION CONTROL MEASURES AND PERMANENTLY STABILIZED WITH PERMANENT SEEDING. m
ONNPLANTS RATHER IEHAN IS SPRAYWIPE
INGT A PUMP MAY BE REQUIRED TO DE-WATER THE SAND FILTER FOR MAINTENANCE WRAPPED IN FILTER FABRIC (#57
WASHED STONE)WITHIN 4'WIDE
FILTER BED AND UNDERDRAIN WATER IS PONDING ON THE SURFACE CHECK TO SEE IF THE COLLECTOR TRENCH.
COLLECTION SYSTEM FOR MORE THAN 24 HOURS AFTER A SYSTEM IS CLOGGED AND FLUSH IF
STORM. NECESSARY.IF WATER STILL PONDS,
REMOVE THE TOP FEW INCHES OF PROP. SAND FILTERFILTER BED MEDIA AND REPLACE.IF PERFORATED 6" DIA. UNDERDRAIN PIPE 0.50% MIN. SLOPE THE FOLLOWING PARAMETERS APPLY TO MATERIALS USED TO CONSTRUCT EMBANKMENTS:
WATER STILL PONDS,THEN CONSULT AN (SCH.40 PVC OR DOUBLE WALL HDPE.
EXPERT.
TYPICAL CROSS SECTION PERFORATIONS SHOULD BE$" DIA. SPACED 6"
OUTLET DEVICE CLOGGING HAS OCCURRED. CLEAN OUT THE OUTLET DEVICE. • BORROW MATERIAL SHALL BE CLASSIFIED AS ML, MH, SC, SM, CL OR CH SOILS ACCORDING TO THE
DISPOSE
OR THEREPLACE CE IME OUTLET
OFFSITE. SPACED
CENTER ALONG 2 LONGITUDINAL ROWS UNIFIED SOIL CLASSIFICATION SYSTEM (ASTM D2487) OR ANY MIXTURE OF THESE SOILS.
THE OUTLET DEVICE IS DAMAGED. DEVICE
OR REPLACE THE OUTLET NOT TO SCALE SPACED MIN. 10' @ 90°APART) •
BORROW MATERIALS SHALL HAVE A LIQUID LIMIT (LL) BETWEEN 40 AND 60 AND A PLASTICITY INDEX (PI)
RECEIVING WATER EROSION OF OTHER SIGNS OF CONTACT THE NC DIVISION OF WATER BETWEEN 15 AND 30 (ASTM D4318).
DAMAGE HAVE OCCURRED AT THE QUALITY 401 OVERSIGHT UNIT AT
OUTLET. 919-733-1786. 1 • MATERIALS SHALL BE FREE OF TOPSOIL, ORGANIC MATERIAL, ROOTS, STUMPS, BRUSH, ROCKS LARGER
�\ 1 THAN 3 INCHES, SUBSOIL, DEBRIS, VEGETATION, AND OTHER FOREIGN MATTER.
• ALL MATERIAL CLODS WILL BE BROKEN DOWN WITH TILLERS AND/OR DISCS TO PROVIDE A HOMOGENEOUS
— — - 5so 1 SOIL THAT IS FREE OF CLAY CLODS GREATER THAN 3 INCHES IN DIAMETER.
o z
°
575�� I PEAKED PAINTED METAL TRASH RACK WITH ANTI a OU o-
- s�� I / Cc
VORTEX PLATE w 0
o BOLTED TO CONCRETE STRUCTURE cr W
2:1 SLOPE,WITH =2'x 3'HINGED HATCH I -I I Z Z
ALIGN Lo 1 / SECURE EIHATCH WITH CHAIN&LOCK —III— I I o TH STEPS INSIDE O
I RIP-RAP APRON I I�I� N >
WIDTH AT OUTLET: 6' (MIN)
s a RIP-RAP APRON — , _ — APRON LENGTH: 16' (MIN) owC
WIDTH AT OUTLET: 8' (MIN) — — — — APRON AT END: 18' (MIN.) TOP OF BOX ELEV. 578.0 DRAINAGE STRUCTURE STEPS
APRON LENGTH: 16' (MIN)
D50: 6"; DMAX:9"
aso APRON AT END: 19' (MIN.) — THICKNESS: 14" (MIN)
D50: 6"; DMAX:9" i� 6"x36"WEIR
THICKNESS: 14" (MIN) — / INV.@ ELEV. 577.5 /
Io PRECAST CONCRETE STRUCTURE I '
p — TINDALL UV4848 OR EQUAL OUTLET STRUCTURE
48"X 48" INSIDE DIMENSIONS '
/ / I (MIN.6"WALL THICKNESS) I 12" 12
L4_
° OUTLET PIPE
— — — — — _ — — 1"WQ ELEV.576.12 / I I \ 3500 PSI CONCRETE ANTI-SEEP COLLAR TYP. LLJ
/ o
BMP B (SAND FILTER) I I i \ \ I NOTES:
/ DRAINAGE AREA: ±6.85 ACRES _ I / \ i � \ \\ _// USE SIDE WALLS AND BOTTOM OF TRENCH AS FORM 2
TOP OF BERM: ±580.0 — \ _ \ \ COMPACT OVER-EXCAVATION TO 95/o DENSITY (PER ASTM D-698) o I I I I I I I 1 z
/ BOTTOM OF BASIN: ±575.0 I \ II / < — CONCRETE SHALL BE 3,000-PSI �
\ \ CV
a �
/ 2' FOREBAY RIP-RAP BERM
/ CLASS B RIP-RAP (NCDOT)
TOP OF BERM: 577.50 BOTTOM ELEV.575.00 2�,�cP CONCRETE ANTI-SEEP COLLAR
—III III III �� STANDARD DETAIL
NOT TO SCALE
W N
z / 5g0
6" PVC UNDERDRAINS a 6" UNDERDRAIN
CONNECTION
/ @MIN. 0.5% SLOPE / / r
INVERT=574.5'
s� TOP OF SPILLWAY
`s / INV. OF 24" RCP OUTLET @ ELEV. 579
/ s� i ELEV.574.4 MAINTAIN 10"D50 RIPRAP USED
O @ OUTLET STRUCTURE DURING EROSION CONTROL PHASES W O
NOT TO SCALE cn J o
N / / INSTALL FILTER FABRIC I—
/ TOP OF DAM � J
/ UNDER RIPRAP Q ¢ W
/ \ \ / / �� / @ELEV. 581.0 W ~ r
// / / / / 3:1 20' 3:1 H allo
o
STABILIZE BASIN (TOP, O w N m
BOTTOM AND SIDES)WITH z Q
A CLEAN WASHED SAND — J H 0 2 � U
I /
BASE BERMUDA SOD (TYP) I I I I I I I cn � p U o W W
a � J W W � � �
°C > OHO
W �
J
_ SAND FILTER EMERGENCY SPILLWAY ELEVATION m v, z o� 00
TOP OF SAND: 575.0 24" XX° 24° 12" NOT TO SCALE w U 3E
AREA OF SAND: 1,427 SQFT. / a FACE OF OUTLET STRUCTURE
I Z z = r\
E / / // / / ; / I ° : a a ° — ORIFICE U M
/ _ O
,/' °�° . I ° a TOP OF DAM Lo
/ \ / / / I _I BARREL/na d • I @ ELEV. 581.0
BMP RISER STRUCTURE j'/ / I = a ° TOP OF SPILLWAY
I ° MAINTAIN 10"D50 RIPRAP USED
.d'. @ ELEV.579.0 DURING EROSION CONTROL PHASES
q VJ
NOTES: w w
ANTI-SEEP COLLAR(TYP.) / / / ° ° DIRECTION OF 3 _, 3 Z J
M / / ,/ USE SIDE WALLS AND BOTTOM OF TRENCH AS FLOW Q
CONTRACTOR TO CUSTOM FABRICATE HOOD ___
FORM FROM PERFORATED SHEET METAL OR EQUIV. MATERIALS ' O
COMPACT OVER-EXCAVATION TO 95% DENSITY ATTACH AS NECESSARY TO OUTSIDE OF OUTLET STRUCTURE 1 U Z
(PER ASTM D-698) TO COVER ORIFICE TO 6"BELOW INVERT. I I I — 'I����
CONCRETE SHALL BE 3,000-PSI III— ��'
COLLARS TO PROJECT 24" FROM OUTSIDE OF PIPE. I I O O Q
MAINTAIN 24"SPACING FROM PIPE JOINTS. LL
ORIFICE HOOD DETAIL SECTION THROUGH SPILLWAY
/ NOT TO SCALE I—
N ib/ /
/ . NOT TO SCALE O s / 5 ,
/ PROJ. MGR.: ETS
NOTE: z DESIGN BY: ETS
RIP-RAP APRON / / / PROVIDE TRASH RACKS FOR ALL OPENINGS ON THE RISER. TYPICALLY THESE DRAWN BY: JCR
WIDTH AT OUTLET: 10' MIN /j/'j / / o ARE REBAR WELDED TO ANGLE IRON. TRASH RACKS SHOULD PROJECT OUT 6"
( ) / PROJ. DATE: OCT. 2023
Lo
APRON LENGTH: 26' (MIN) /�m�/ / / Lo / FROM FACE OF RISER AND EXTEND 6" BELOW WEIR CREST OPENINGS. MAX DRAWING NUMBER:
APRON AT END: 3�0' (MIN.) / ,j / / / l SPACING BETWEEN BARS IS 3" IMPORTANT NOTE TO CONTRACTOR Q
l / D5I ' 11 ; DMAX:16 z
E , Qv THICKNESS: 24" (MIN) :% / / AS-BUILTS MUST BE APPROVED BEFORE ISSUANCE OF FINAL PLAT C408-R
/ �/ 20 0 20 40 AND/OR CERTIFICATE OF OCCUPANCY (C.O.).
AS-BUILT SAND FILTERS PRIOR TO MEDIA BEING PLACED OVER J WKD PROJ. NO.:
SCALE: 1" = 20' UNDERDRAINS. Lu 2023094600CL

00. NOTE:
agg SAND FILTER OPERATION&MAINTENANCE PLAN OUTLET STRUCTURE �WK
<a� TOP OF DAM 48"x 48"CONCRETE STRUCTURE ALL SLOPES DRAINING TO SAND FILTER AREAS SHALL BE STABILIZED PER THE NORTH CAROLINA STATE EROSION
z o~ SAND FILTER MAINTENANCE IS THE RESPONSIBILITY OF THE TENANT AND/OR ITS DESIGNATED PROPERTY ELEV: 558.0' TOP: 554.0' DICKSON
MANAGEMENT ASSOCIATION. 3:1 SIDE SLOPES INV. OUT: 549.50' (24" RCP) CONTROL & SEDIMENT CONTROL PLANNING & DESIGN MANUAL BEFORE MEDIA IS PLACED. community infrastructure consultants
U=
o 0 m IMPORTANT MAINTENANCE PROCEDURES:
Naa DRAINAGE AREA MUST BE STABILIZED BEFORE FILTRATION CONTROLS & FILTER MEDIA ARE INSTALLED ANY SILT 1213 W. MOREHEAD STREET
�`=o THE DRAINAGE AREA WILL BE CAREFULLY MANAGED TO REDUCE SEDIMENT LOAD TO THE SAND FILTER. . SUITE 3OO
THAT ENTERS THE FACILITY SHALL BE REMOVED BY THE CONTRACTOR AND DISPOSED OF OFFSITE.
a-o THE SEDIMENTATION CHAMBER OR FOREBAY WILL BE CLEANED OUT WHENEVER SEDIMENT DEPTH EXCEEDS SIX CHARLOTTE, INC 28208
H m
w a a INCHES ONCE A YEAR,SAND MEDIA WILL BE SKIMMED. INSTALL 3"OF
558 EMERGENCY SPILLWAY - - - 558 (t)[phone]
aoo m THE SAND FILTER MEDIA WILL BE REPLACED WHENEVER IT FAILS TO FUNCTION PROPERLY AFTER MAINTENANCE. ELEVATION - 556.00 WASHED#3 OR 704 334-0078
DAM CLEANOUT ( ( )
Foa THE SAND FILTER WILL BE INSPECTED BY A PROFESSIONAL ANNUALY AND WITHIN 24 HOURS AFTER EVERY STORM 557 (SEE PLAN FOR LOCATION) #4 CRUSHED (TYPICAL AT ALL BENDS, - TOP OF BERM: 553.0 557
EVENT GREATER THAN 1.0 INCHES. RECORDS OF OPERATION AND MAINTENANCE W21LL BE KEPT IN A KNOWN SET STONE OVER
w LOCATION AND WILL BE AVAILABLE UPON REQUEST. WWW.WKDICKSON.COM
DLL 556 - - FILTER MEDIA 6" ABOVE GROUND SECURED 556 SEDIMENT BASIN CONVERSION NOTE:
oo l z INSPECTION ACTIVITIES SHALL BE PERFORMED AS FOLLOWS: ANY PROBLEMS THAT ARE FOUND SHALL BE REPAIRED WITH WATER TIGHT CAP)
o.w IMMEDIATLEY. INC LICENSE NO.F-0374
100 50 100YR-6HR PEAK STAGE=554.43 ALL AREAS ABOVE THE PERMANENT POOL SHALL BE PREPARED & SEEDED TO PERMANENT GROUND COVER
555 25 50YR-6HR PEAK STAGE=554.24 555
azz BMP ELEMENT: POTENTIAL PROBLEM' HOW IWILL REMEDIATE THE PROBLEM'
10 25YR-6HRP AK STAGE=554.05' SPECFICATIONS.
w k J ENTIRE BMP TRASH DEBRIS PRESENT REMOVE THE TRASH0EBRIS 554 - - 10YR-6HR PEAK STAGE=553.71,'-554
�z ADJACENT PAVEMENT SEDIMENT IS PRESENT ON THE REGRADE THE SOIL IF NECESSARY TO
oHc� (IF APPLICABLE) PAVEMENT SURFACE REMOVE THE GULLY,AND THEN PLANT A ANTI-SEEP COLLAR (TYP.) THE PERMANENT SAND FILTER SHALL NOT BE CONSTRUCTED UNTIL THE CONTRIBUTING DRAINAGE AREA IS """'•••Q zoo GROUND COVER AND WATER UNTIL IT IS 553 - - - - °� �4
N a ESTABLISHED.PROVIDE LIME ANDA � �''-' „ �1 553 STABILIZED. ANY SEDIMENT THAT ACCUMULATES WITHIN THE POND SHALL BE REMOVED AND THE FINAL GRADE ,�`��-(N C'4Rp�'%,,�
Q F F ONE-TIME FERTILIZER APPLICATION.
SAND 3 REESTABLISHED TO THE PROPOSED CONTOURS SHOWN.
Nam- s
i a o VEGETATION IS TOO SHORT OR TOO MAINTAIN VEGETATION AT AN 552 - - ,, `-- 1" - 552 ,•' O OFE
�¢¢ LONG. APPROPRIATE HEIGHT. FILTER FOREBAY QQ 4' 2
ao� FLOW DIVERSION STRUCTURE THE STRUCTURE IS CLOGGED. UNCLOG THE CONVEYANCE AND 551 - 1°wQ PEAK STAGE(6562 cF)=551.54 551 THE PROPOSED STORMWATER MANAGEMENT BMP IS TO BE CONVERTED FROM SEDIMENT AND EROSION S
zaw DISPOSE OF ANY SEDIMENT OFFSITE. CONTROL BASINS. THIS CONVERSION SHOULD BE COMPLETED AFTER THE ENTIRE DRAINAGE AREA IS STABILIZED 044570
-� THE STRUCTURE IS DAMAGED. -
aZ� MAKE ANY NECESSARY REPAIRS OR 550 550 AND APPROVAL GIVEN FOR THE LOCAL & STATE AUTHORITY. `V
z o REPLACE IF DAMAGE IS TOO LARGE FOR
z w MIN 12"OF C(9IN ITIOIVE)5OV _• p .�
o m REPAIR.
549 (ME0,1UMACSGREGgTECONCREl' N' _ 549 T SUS °�
ti O
ooa FOREBAYORPRETREATMENT SEDIMENT HAS ACCUMULATED TOA SEARCH FOR THE SOURCE OF THE sANDASTMC$s) THE CONVERSION TO A PERMANENT STORMWATER BMP SHALL BE ACCOMPLISHED BY REGRADING THE BASIN •°•.,, ,, 0
yya AREA DEPTH OF GREATER THAN SIX SEDIMENT AND REMEDY THE PROBLEM IF 1 CONTOURS TO THOSE SHOWN ON THE PLAN AND INSTALLING FILTER MEDIA/UNDERDRAIN PIPING.
F z INCHES. POSSIBLE.REMOVE THE SEDIMENT AND 548 548
,oE
STABILIZE OR DISPOSE OF IT IN A Mar 28 2024 5:42 P M
F m o LOCATION WHERE IT WILL NOT CAUSE
15aF IMPACTS TO STREAMS OR THE BMP. 547 CLASS B RIPRAP BERM FACED 547 ANY SEDIMENT LADEN WATER WITHIN THE SEDIMENT BASIN SHALL BE DRAWN DOWN BY USE OF PUMPS AND PROFESSIONAL SEAL
awe EROSION HAS OCCURRED. PROVIDE ADDITIONAL EROSION WITH#57 WASHED STONE DISCHARGES THROUGH A'BLADDER'TYPE SYSTEM OR DISPOSED OF OFFSITE IN AN APPROVED SYSTEM.
o a LL PROTECTION SUCH AS REINFORCED
TURF MATTING OR RIPRAP IF NEEDED 546 (3:1 SIDE SLOPES) 546
TO PREVENT FUTURE EROSION ALL SEDIMENT REMOVED SHALL BE PLACED IN A DESIGNATED SPOIL PILE AND ADEQUATELY PROTECTED WITH
PROBLEMS. PERMEABLE NON-WOVEN 6" PVC DRAIN 1% SLOPE m
WEEDS ARE PRESENT. REMOVE THE WEEDS,PREFERABLY BY FILTER FABRIC ABOVE, BELOW EROSION CONTROL MEASURES AND PERMANENTLY STABILIZED WITH PERMANENT SEEDING.
HAND.IF A PESTICIDE IS USED,WIPE IT &SIDES OF SAND LAYER (2 PER RIP-RAP SECTION OF
ON PLANTS RATHER THAN SPRAYING. BERM-SEE PLAN VIEW)
FILTER BED AND UNDERDRAIN WATER IS PONDING ON THE SURFACE CHECK TO SEE IF THE COLLECTOR NOTE:
COLLECTION SYSTEM FOR MORE THAN 24 HOURS AFTER A SYSTEM IS CLOGGED AND FLUSH IF 6" MIN. UNDERDRAIN GRAVEL BED
STORM. NECESSARY.IF WATER STILL PONDS, A PUMP MAY BE REQUIRED TO DE-WATER THE SAND FILTER FOR MAINTENANCE WRAPPED IN FILTER FABRIC (#57
REMOVE THE TOP FEW INCHES OF
FILTER BED MEDIA AND REPLACE.IF SHWT PRESENT PER REPORT FROM SUMMIT WASHED STONE)WITHIN 4'WIDE THE FOLLOWING PARAMETERS APPLY TO MATERIALS USED TO CONSTRUCT EMBANKMENTS:
WATER STILL PONDS,THEN CONSULT AN
EXPERT. DATED 3/4/24. SHWT ELVE: =544.38 TRENCH.
OUTLET DEVICE CLOGGING HAS OCCURRED. CLEAN OUT THE OUTLET DEVICE. PROP.
���D �I� ��� • BORROW MATERIAL SHALL BE CLASSIFIED AS ML, MH, SC, SM, CL OR CH SOILS ACCORDING TO THE
DISPOSE OF THE SEDIMENT OFFSITE. PERFORATED 6"DIA UNDERDRAIN PIPE 050% MIN SLOPE UNIFIED SOIL CLASSIFICATION SYSTEM (ASTM D2487) OR ANY MIXTURE OF THESE SOILS.
THEouTLETDEVICEISDAMAGED. DEvCEORREPLACErHEouTLEr (SCH. 40 PVC OR DOUBLE WALL HDPE. • BORROW MATERIALS SHALL HAVE A LIQUID LIMIT (LL) BETWEEN 40 AND 60 AND A PLASTICITY INDEX (PI)
RECEIVING WATER EROSION OF OTHER SIGNS OF CONTACT THE NC DIVISION OF WATER PERFORATIONS SHOULD BE$" DIA. SPACED 6" BETWEEN 15 AND 30 (ASTM D4318).
DAMAGE HAVE OCCURRED AT THE QUALITY 401 OVERSIGHT UNIT AT TYPICAL CROSS SECTION ON-CENTER ALONG 2 LONGITUDINAL ROWS • MATERIALS SHALL BE FREE OF TOPSOIL, ORGANIC MATERIAL, ROOTS, STUMPS, BRUSH, ROCKS LARGER
OUTLET. 919a33-1786. SPACED MIN. 10- @ 90°APART)
THAN 3 INCHES, SUBSOIL, DEBRIS, VEGETATION, AND OTHER FOREIGN MATTER.
\ \ \ • ALL MATERIAL CLODS WILL BE BROKEN DOWN WITH TILLERS AND/OR DISCS TO PROVIDE A HOMOGENEOUS
SOIL THAT IS FREE OF CLAY CLODS GREATER THAN 3 INCHES IN DIAMETER.
0 O
0 a_
\ \ \ \ \ \m Cc
PEAKED PAINTED METAL TRASH RACK WITH ANTI n W 0
\ \ \ \ \ \ VORTEX PLATE M
\ \ \ BOLTED TO CONCRETE STRUCTURE r4L .
- Zp\ \ 2:1 SLOPE,WITH =2'x 3'HINGED HATCH Q
ALIGN WITH STEPS INSIDE\ SECURE HATCH WITH CHAIN&LOCKow� NSTABILIZE BASIN (TOP, TOP OF BOX ELEV.554.00 DRAINAGE STRUCTURE STEPS
BOTTOM AND SIDES)WITHA CLEAN WASHED SANDIll
\\ \ BASE BERMUDA SOD (TYP) \ 12"x24"WEIR /
\ INV.@ ELEV.553.00 I \
\ \ \ \ \ \ \ to PRECAST CONCRETE STRUCTURE OUTLET STRUCTURE I <a
\ � TINDALL UV4848 OR EQUAL I
\ \ \ 48"X 48" INSIDE DIMENSIONS 12" 12
1 \ \ \ \ \ \ \ \ I (MIN.6"WALL THICKNESS) 0.50" \
\ \ \ \ \ \mom - - - - -
1\ ° ° OUTLET PIPE
3500 PSI CONCRETE ANTI-SEEP COLLAR TYP. _ Q
1 \ \ \ \ o
1"WQ ELEV. 551.54 NOTES: Z
USE SIDE WALLS AND BOTTOM OF TRENCH AS FORM z
COMPACT OVER-EXCAVATION TO 95/o DENSITY (PER ASTM D-698)
o
1 \ BMP#C (SAND FILTER) \\ \ �� \ \ I / ~ �/ CONCRETE SHALL BE 3,000-PSI N
1 \ DRAINAGE AREA: ±4.65 ACRES \\` \ \ \ I /
\\ \ TOP OF BERM: ±558.0
\ \ \ ELEV.550.00
\ BOTTOM OF BASIN: ±550.0 \ \ oY I I \ P CONCRETE ANTI-SEEP COLLAR
STANDARD DETAIL
NOT TO SCALE
IN
N
6" UNDERDRAIN �� N
\\ \ PROJECT BOUNDARY \ \�X \ CONNECTION
T
\ \ o cr INVERT=549.5' INV.OF 24"RCP OUTLET
r (TYP.) \ TOP OF SPILLWAY
� @ELEV.549.50
_ -� BMP RISER STRUCTURE \ \\ I ��� \ @ ELEV. 556.0
\� \\ \ MAINTAIN 10"D50 RIPRAP USED
\ \ DURING EROSION CONTROL PHASES W O
\ 2' FOREBAY RIP-RAP BERM \� OUTLET STRUCTURE cn U o
\ 6" PVC UNDERDRAINS \ CLASS BRIP-RAP (NCDOT) I 1 �` ^ NOT TO SCALE INSTALL FILTER FABRIC a > J W
@ MIN. 0.5% SLOPE \ \\ UNDER RIPRAP TOP OF DAM
1 \ \ TOP OF BERM: 573.00 � I \ @ ELEV. 558.0 0 0 m N
3:1 20' 3:1 z p 00C\j U
\ 550 \ \ I \ I I \\ \\ \ O -i > () J
\ \ \ \ I ANTI-SEEP COLLAR (TYP.) �� O Q w Q - z <
\ SFA BMP OUTFACE
1 \ \ \ I m� CD
~ _
OW U
\ 1 \ I \ W
> O H O
1 \ 1 \ \ \ I 1 zJ
\ \ \ \ \ I I EMERGENCY SPILLWAY ELEVATION co w w Q 0°
\ \ w � _
' \ \ \ \ I I FACE OF OUTLET STRUCTURE NOT TO SCALE z O U
1 \ \ � \ \ \ \ I I I-24 -I--XX"--1-24 12" Q - o
1 0 \ v a
ORIFICE O U co
\ 11 \ \ SAND FILTER \ I 1 -I < Lo
' a . . <� � I I °° d Q .
TOP OF DAM
s SWIM C FES I �� BARREL /a I @ ELEV. 558.0 U
I \ \ TOP OF SAND: 550.0
561 00 1� \\ 1 \ AREA OF SAND: 900 SQFT. cn RIP-RAP APRON I ° <°
1 \ `n WIDTH AT OUTLET: 6' (MIN) _
I I '< A . 4�° TOP OF SPILLWAY MAINTAIN 10"D50 RIPRAP USED
ol\ \ \ \ \ \ \ \ APRON LENGTH: 15' (MIN) _I a a @ ELEV. 556.0 DURING EROSION CONTROL PHASES I-
\ \ \ \ \ \ \ o \ \\ APRON AT END: 17' (MIN.) ° _ . °
O15 RIP-RAP APRON \ \ \ \ l I I I D50. 6 , DMAX.9 z Iii w
WIDTH AT OUTLET: 6' (MIN) \ \ \ \ I THICKNESS: 14 (MIN) NOTES: � J
2,240 SQ.FT. ( \ \ \ I I 3 -'�, .--- -- •�
DIRECTION OF 3 O Q H
APE:561.00 APRON LENGTH: 13' (MIN) \ \ I USE SIDE WALLS AND BOTTOM OF TRENCH AS CONTRACTOR TO CUSTOM FABRICATE HOOD FLOW Z H
\ \ I I \ I FROM PERFORATED SHEET METAL OR EQUIV. MATERIALS U FORM 1 `� 1 H 0
\ APRON AT END: 16' (MIN.) 1 \ \ I I 1 ATTACH AS NECESSARY TO OUTSIDE OF OUTLET STRUCTURE I �� �. U Z
\ D50: 5"; DMAX:8" I I I I \ I COMPACT OVER-EXCAVATION TO 95% DENSITY TO COVER ORIFICE TO 6" BELOW INVERT. I- W
THICKNESS: 11" (MIN) \ \ \ \ I I I I I (PER ASTM D-698) _ Q Q
\ \ I I CONCRETE SHALL BE 3,000-PSI I I- �' O fr
14 \\ I \\\ FES CO I I II I COLLARS TO PROJECT 24" FROM OUTSIDE OF PIPE. LL a
\ \ \ I I I I MAINTAIN 24"SPACING FROM PIPE JOINTS. ORIFICE HOOD DETAIL SECTION THROUGH SPILLWAY H
s,lsssQ.FT. \ � \ \ I NOT TO SCALE
GPE:561.00
\ I I I I I NOT TO SCALE
PROJ. MGR.: ETS
NOTE: z DESIGN BY: ETS
� DRAWN BY: JCR
PROVIDE TRASH RACKS FOR ALL OPENINGS ON THE RISER. TYPICALLY THESE ARE REBAR
\ \ \ I I I I WELDED TO ANGLE IRON. TRASH RACKS SHOULD PROJECT OUT 6" FROM FACE OF RISER AND PROJ. DATE: OCT. 2023
EXTEND 6" BELOW WEIR CREST OPENINGS. MAX SPACING BETWEEN BARS IS 3" DRAWING NUMBER:
IMPORTANT NOTE TO CONTRACTOR z
AS-BUILTS MUST BE APPROVED BEFORE ISSUANCE OF FINAL PLAT C409-R
\ 1 I DI Cl
555 / / AND/OR CERTIFICATE OF OCCUPANCY (C.O.). J WKD PROJ. NO.:
_ AS-BUILT SAND FILTERS PRIOR TO MEDIA BEING PLACED OVER LLI
UNDERDRAINS. 2023094600CL