SW6220301_Long Point Stormwater Plan_20221116

CONSTRUCTION SEQUENCE
FOR WET DETENTION POND:
1. INSTALL EROSION CONTROLS.
2. CONSTRUCT DAM BASE AND AREAS BELOW THE
NORMAL POOL CONSTRUCTION TO BE
PERFORMED UNDER THE INSPECTION OF THE
GEOTECHNICAL ENGINEER. SEED UPON
COMPLETION. `
4' MIN
3. INSTALL OUTLET PIPE, RIP -RAP APRON AND
EMBANKMENT WIDTH
STONE FILTER RING.
4. CONSTRUCT OUTLET STRUCTURE.
6' TOPSOIL FOR ALL
AREAS ABOVE THE TRASH RACK
5. REMOVE ACCUMULATED SEDIMENT AND SEED
NORMAL POND ELEVATION REFER TO DETAIL
UPON COMPLETION.
THIS SHEET
24 ' HOPE WITH WATER TIGHT SEAL
PIPE TO BEDDED TOP OF EMBANKMENT ELEVATION=263.5
PER DIRECTION OF GEOTECHNICAL 6" TOPSOIL ABOVE NOTE: 1.0' STORM ELEVATION IS 259.17 AND INTERMEDIATE
WEIR IS ELEVATION 259.8. THERE IS ADDITIONAL STORAGE
ENGINEER 2 I _ _ I I I 6' CLAY LINER REFER TO DETAIL inn YEAR MQRM E EVAilON=262.71 DESIGNED FROM THE 1.0' STORM ELEVATION TO THE
J ON LITTORAL SHELF FOR INCREMENTAL INTERMEDIATE WEIR ELEVATION.
1 6" CLAY SOIL I 3 WEIR
LINER ON INSIDE - �-
FACE OF I 10 YEAR STORM FI FVATION=261.46
EMBANKMENT !� 1
41 PRECAST
6FT LITTORAL ° 11 1 CONCRETE RISER 2 YEAR STORM ELEVATION=260.49
SHELF (INSTALL STEPS
- i ! AS NECESSARY)
1 YEAR STORM ELEVAIlON=260.18
1.0-INCH STORM ELEVATION=259.17 EXISTING GRADE=262.0t
INV=259.0
NORMAL POND ELEVATION=259.0
PVC. ELBOW
SEE DETAIL
3' MIN
1 ELEV=257.0 '' a ;' i I �' I� 1.75 NOTE PUMPS SHALL BE USED TO DRAIN
i 1 THE POND WHEN NECESSARY. REFER TO DETAIL
-'�THIS SHEET FOR DEWATERING REQUIREMENTS.
`I11
4' IIN. ASTM 0-923 SEAL j
KEY BETWEEN BARREL. arc RISER.
RISER BASE TO BE FILLED .�
CUTOFF TRENCH WITH CONC. TO INVERT OF BOTTOM OF POND (TOP OF SEDIMENT STORACE)=251A
SHALL BE
APPROXIMATE SIZE BARREL CONCRETE
D �N RISER AFTER
EXCAVATE AND BACK8"X8'XI"X1Y LONG ANGLE (6 TOT. REQUIRED) TO ANCHOR RISER TO ANGLES ARE SECURED (_ (BOTTOM OF SEDIMENT STORAGE)=250.0
WITH COMPACTED BASE. PROVIDE 2-3 a A307 BOLTS FROM ANGLE TO RISER AND TO BASE AND RISER.
2-A307 7 HOOKS 3/4° DIA. X 12' LONG FROM ANGLE TO BASE.
STRUCTURAL FILL AS ANGLE TO BE FIELD COATED WiTH ZINC RICH PAINT AFTER I i
DIRECTED BY GEOTECHNICAL CONSTRUCTION. "J' HOOKS TO BE PLACED UNDER LOWER REINFORCING
ENGINEER STEEL 6" CLAY SOIL
5'x5'xl.5' CONC. BASE REINFORCE WITH #4 BARS AT 12" O.C. TOP LINER
AND BOTTOM OF EACH DIRECTION PROVIDE 3" MIN. CLEARANCE MAIN POOL
BETWEEN EDGE OF CONC, AND STEEL REINFORCING
26'-24' HOPE 0 3.85%
PROFILE OF WET POND DETENTION SYSTEM
SCALE: N.T.S.
LTER MEDIA (SEE NOTE 2)
SILT FENCE AS NEEDED LIMP
FL STORMWATER MANAGEMENT NOTES;
1. THE DEVELOPER OR HIS AGENT SHALL CONTACT THE DESIGN ENGINEER WHEN
_ THE BEST MANAGEMENT PRACTICE(S)ARE CONSTRUCTED AND ABOUT TO
BECOME OPERATIONAL 50 A FINAL INSPECTION CAN BE PERFORMED TO
DETERMINE COMPLIANCE WITH THE APPROVED PLAN CAN BE PERFORMED. TRASH RACK
AIER LEVEL 2. ANNUAL MAINTENANCE INSPECTION AND REPORT REQUIRED THE OWNER OF
NOTES: A PERMITTED STRUCTURAL STORMWATER BMP/CONTROL SHALL ANNUALLY
SUBMIT A MAINTENANCE AND INSPECTION REPORT FOR EACH BMP TO THE
1. PRIOR TO INSTALLATION, MANUFACTURER SPECIFICATIONS OF FILTER MEDIA SHALL BE REVIEWED TO _ STORMWATER ADMINISTRATOR ANNUAL INSPECTIONS SHALL BEGIN WITHIN
ONE YEAR OF THE RECORDATION OF ANY DEED(S) SHOWING STORMWATER
ENSURE THAT DISCHARGE FROM FILTER MEDIA SHALL MEET OR EXCEED THE PROVISIONS OF THE CLEAN I I
WATER ACT. ° BMPs/CONTROL STRUCTURES I t
2. ENSURE THAT PUMP PRESSURE DOES NOT EXCEED FILTER MEDIA PRESSURE RATING. 3. UPON COMPLETION OFTHE PROJECT, AND BEFORE A CERTIFICATE OF
_ OCCUPANCY SHALL BE GRANTED, THE ENGINEER OF RECORD SHALL CERTIFY I I
3. FILTER MEDIA MAY BE, BUT NOT LIMITED 70, SAND MEDIA FILTRATION DEVICES, RATED FILTER FABRIC I _ - THAT THE COMPLETED PROJECT IS IN ACCORDANCE WITH THE APPROVED I I
BAGS OR POLYMER BASED DEWATERING PRACTICES. 7`- STORMWATER MANAGEMENT PLANS AND DESIGNS.
4. PUMP STRAINER SHALL NOT BE IN CONTACT IMTH BOTTOM OF POND, ilk 4. A FINAL INSPECTION OF THE SITE AND STORMWATER MANAGEMENT I I
j I I 11I r BMP/CONTROLS TO BE SCHEDULED WiTH AND COMPLETED BY THE PROJECT I
ENGINEER.
BMP POND DEWATERING LOW POINT 5. NCDEQ AND THOR ASSIGNS HAVE RIGHT TO ACCESS THE STORMWATER
RIS
CONTROL(s) FOR INSPECTIONS OR MAINTENANCE AS NECESSARY.
,
6. THE ENGINEER'S CERTIFICATION OF COMPLETION WILL BE REQUIRED PRIOR TO
SEEDBED PREPARATION: THE FINAL PLAT OR CERTIFICATE OF OCCUPANCY THE STORMWATER
CONTROL IS TO BE INSPECTED TO ENSURE IT IS FUNCTIONING AS DESIGNED
1 CHISEL COMPACTED ALAS AND SPREAD TOPSOIL THREE INCHES DEEP OVER ADVERSE SOIL CONDITIONS, IF AND HAS FULL DESIGN VOLUME PRIOR TO ISSUANCE OF THE FINAL
AVAILABLE, CERTIFICATE OF OCCUPANCY.
2. RIP THE ENTIRE AREA TO SIX INCHES DEEP,
3. REMOVE ALL LOOSE ROCK, ROOTS AND OTHER OBSTRUCTIONS, LEAVING SURFACE REASONABLY SMOOTH AND 7. THE PROPERTY OWNER IS RESPONSIBLE FOR MAINTAINING THE STORMWATER
UNIFORM. CONTROLS(s) ACCORDING TO THE APPROVED MAINTENANCE PLAN AND
4 APPLY AGRICULTURAL LIME, FERTILIZER, AND SUPERPHOSPHATE UNIFORMLY AND MIX WITH SOIL (SEE SEEDING DIRECTION OF NCDEQ.
MIXTURE).
5. CONTINUE TILLAGE UNTIL 'A WELL -PULVERIZED, FIRM, REASONABLY UNIFORM SEEDBED 15 PREPARED FOUR TO SIX ,��. �-. �-;�. ��,� moo. ,fir �®^��,�.® �- ""��..P• �.-.�®"'��^ ®"` �s� p�-. �� �" ��'" �./'' ��� ���I""� I °�A' � �^I'
INCHES DEEP.
6. SEED ON A FRESHLY PREPARED QED AND COVER SEED LIGHTLY WITH SEEDING EQUIPMENT OR CULTIPACK
AFTER SEEDING.
7. MULCH IMMEDIATELY AFTER SEEDING AND ANCHOR MULCH.
8. INSPECT ALL SEEDED AREAS AND MAKE NECESSARY REPAIRS OR RE-SEEDINGS WITHIN THE PLANTING SEASON, IF j � � d .3
POSSIBLE. IF STAND SHOULD BE MORE THAN 60% DAMAGED, RE-ESTABUSH FOLLOWING THE ORIGINAL LIME,
FERTILIZER AND SEEDING RATES
9. CONSULT S&EC ENVIRONMENTAL ENGINEERS ON MAINTENANCE TREATMENT AND FERTILIZATION AFTER PERMANENT
�OD�A�EAS ABOVE"': `` >` A ACOVER IS ESTABLISHED. o\\�
N ° RM L POOL
LANDSCAPING NOTES: ° Et VATIflN
ALL LANDSCAPING SHALL BE IN COMPLIANCE WITH THE NCOED BMP REQUIREMENTS.
NG SURVIVAL REPLACEMENT. °
LANDSCAPE CONTRACTOR SHALL PROVIDE A TWO-YEAR WARRANTY FOR BMP PLANET /
TOTAL LITTORAL S ELF
AT THE END OF THE FIRST YEAR AND AT THE END OF THE TWO-YEAR WARRANTY PERIOD, ALL PLANTS THAT DO NOT ( ! /
.row AREA=4,490�.>
SURVIVE MUST BE REPLACED. �. � } ! � �
REFER TO �7r ETAIL w BERM �l
ESTABLISHMENT PROCEDURES SUCH AS CONTROL. OF INVASIVE WEEDS, ANIMAL AND VANDAL DAMAGE, MULCHING, FOR LPL 1JANGS �a
`Iv ,
RE -STAKING WATERING TO THE EXTEND AND MESH OR TUBE PROTECTION REPLACEMENT, SHALL BE IMPLEMENTED �., , �✓"""�
NEEDED TO ENSURE PLANT SURVIVAL, STAKING MUST BE REMOVED AFTER ESTABLISHMENT (APPROXIMATELY 12
MONTHS , TO PREVENT GIRDLING STRANGLING OF ALL WOODY PLANTS. �l aura �\ `
} (STRANGLING) TOP OF EM-�NKMEfdT
_ � ASS 2 R -��P �\
SOD WITHIN BMP AND SURROUNDING AREAS TO BE BERMUDA OR CENTIPEDE GRASS.
ELEV 263.5 1,
MUST BE APPLIED AT THE RATES SPECIFIED BY THE SUPPLIERS. IF PLANT �f EeR ® CL-SS A,RIP-RAP i
GRASS OR WILDFLOWER SEED M
NOT BE ACHIEVED WITH SEEDING BY THE TIME OF SUBSTANTIAL' COMPLETION OF THE STORMWATER ,r , ' y !'
ESTABLISHMENT CANNOT � .� � �R FILTER FABRIC.
FACILITY PORTION 4F THE PROJECT, THEN THE CONTRACTOR SHALL PLANT THE AREA.WITHI WILDFLOWER SOD, PLUGS, f 5 (� \
CONTAINER PLANTS, OR OTHER MEANS TO COMPLETE THE SPECIFIED PLANTING AND PROTECT AGAINST EROSION AIN POND `� AT,,POREBAY WEIR LoTr
43
BEFORE WATER IS ALLOWED TO ENTER THE STORMWATER BMP FACILITY. AREA a �i� ✓ �� \� ��irSF
P�
ALL MATERIALS SHALL BE ACQUIRED FROM AN APPROVED NCDEQ PLANT VENDOR. PLANT MATERIAL SHOULD BE i�/ FORE134Y \� f
PURCHASED FROM A LOCAL SOURCE TO ENSURE SURVIVABILITY. LOCAL VENDORS FOR THIS SITE INCLUDE
i
CILL IDE NATIVE PLANT NURSERY 919-662-5566 F�S y / `i r � Y / WEIR � �� • i
- GROWING WILD NURSERY 910-259-6361 7 \ /
NC FOREST SERVICE 919-731-7988 ENV--a.0
- PLANT DELIGHTS NURSERY 919-772-4794 f K .: '. j r~ �' f
1
TARHEEL NATIVE TREES 919-553-5927 ✓ + _ �' ..� FOREBpyY
! s l}
AREA/ li
IMMEDIATELY AFTER THE WET DETENTION BASIN IS ESTABLISHED, THE PLANTS ON THE VEGETATED SHELF AND 26'
PERIMETER OF THE BASIN SHOULD BE WATERED TWICE WEEKLY IF NEEDED UNTIL THE PLANTS BECOME ESTABLISHED �. 1
(COMMONLY SIX WEEKS) � •85% 0 1rwa FES STORM OT
44
WAI R- GHT ( . DRAINAGE 24,014
NO PORTION OF THE WET DETENTION POND SHOULD BE FERTILIZED AFTER THE FIRST INITIAL FERTILIZATION THAT IS 1
I p -;-r° � �, BY OTHER /
REQUIRED TO ESTABLISH THE PLANTS ON THE VEGETATED SHELF. _�
I4 � 1 ST 1X1VIWATT
' NAG MENT
LANDSCAPING NOTES:, \
1. CONTRACTOR SHALL COMPLY WiTH ALL APPLICABLE CODES AND ORDINANCES REGARDING LANDSCAPING. , 0 a TL T C0 TROL 1 t ERASE ENT
2. IT IS THE RESPONSIBILITY E CONTRACTOR TO ESTABLISH A HEALTHY STAND OF GRASS ON ALL SEEDED 1 i f
AREAS. OF TH S�UCTURE
3. CONTRACTOR SHALL PROVIDE NATURAL TOPSOIL THAT IS FERTILE, FRIABLE, WITHOUT MIXTURE OF SUBSOIL EFER TO ET LS 1 ` '` r v 1 ✓ /r / I7
MATERIALS, AND OBTAINED FROM A WELL DRAINED, AVAILABLE SITE. IT SHALL NOT CONTAIN SUBSTANCES s IS SHE'T
SCREENED AND FREE FROM CLAY LUMPS 1 /
WHICH MAY BE HARMFUL TO PLANT GROWTH. TOPSOIL SHALL BE SC , ,% : OTHER OBJECTS / ENV 25 .0
STONES, ROOTS, PLANTS, OR SIMILAR SUBSTANCES 1 OR MORE IN DIAMETER DEBRIS,,OR �, -E � o
WHICH MIGHT BE A HINDERANCE r0 PLANTING OPERATIONS TOPSOIL SHALL CONTAIN AT LEAST 4-67. ORGANIC / /
MATTER BY WEIGHT AND HAVE A PH RANGE O F 5.5 TO 7.0. / \ .� '
4. CONTRACTOR SHALL BE RESPONSIBLE FOR THE WATERING AND THE MAINTENANCE OF ALL LANDSCAPED AREAS / I`
UNTIL THE LATER OF, (a) THIRTY (30) DAYS FOLLOWING THE PLANTING CP THE GRASS AND SHRUBS, OR (b) IIF
- THE DATE THAT STORE OPENS FOR BUSINESS TO THE PUBIC. CONTRACTOR SHALL ALSO BE RESPONSIBILITYt ' "\�''-FOR THE SURVIVAL OF THE BMP PLANTING MATERIALS DURING THE TWO-YEAR WARRANTY PERIOD AND SHALL
REPLACE ALL PLANTS THAT DO NOT SURVIVE AT THE END OF THE FIRST YEAR AND AT THE END OF THE
SECOND YEAR OF THE WARRANTY PERIOD. GRAPHIC SCALE
5. CONTRACTOR TO VERIFY QUANTITIES PRIOR TO COMMENCING WORK.
6. ANY DISTURBED AREAS NOT SCHEDULED FOR HANDSCAPE, PLANTINGS, OR MULCH SHALL BE SEEDED LAWN. 50 0 25 50 100 200
REFER TO 51TE PLAN FOR LOCATION OF AREAS TO BE SODDED.
7. NO PLANT SUBSTITUTIONS ARE PERMITTED WITHOUT WRITTEN APPROVAL OF THE OWNER5 REPRESENTATIVE PLAN VIEW
8. FOR NEW PLANTING AREAS, REMOVE ALL PAVEMENT, GRAB SUB -BASE AND CONSTRUCTION DEBRIS; REMOVE
COMPACTED SOIL AND ADD 18" NEW TOPSOIL, OR TILL AND AMEND THE TOP 18' OF EXISTING SOIL TO MEET
TOPSOIL/PLANTING MIX STANDARDS FOR TREES ( IN FEET
9, ADJUST TREE PLANTING LOCATIONS TO AVOID UNDERGROUND UTILITIES, PLANT VY FROM ALL UNDERGROUND 1 inch = 50 ft.
UTILITIES (SEWER AND STORM DRAINAGE, GAS, WATER, PHONE, AND ELECTRICAL LINES.)
Cad file name: P: 046-DoubleD\022-Long'Point Road -missing permit (220061)\CADD\0413-022-SWD #1,dwg
TOP OF STRUCTURE NOT SHOWN FOR CLARITY
(REMOVABLE TRASH RACK)
1 OUTLET CONTROL STRUCTURE -INCREMENTAL WEIR
SCALE: N.T.S.
6' TOPSOIL FOR ALL
AREAS ABOVE THE
NORMAL POND ELEVATION
FOREBAY BER
6' TOPSOIL ABOVE
6' CLAY LINER 3:1
ON LITTORAL SHELF
i_
6FT LITTORAL
SHELF6:1 I _
CLASS 2 RIP -RAP
COVERED WiTH CLASS A RIP -RAP
OVER FILTER FABRIC
MIN. 7' WEIR AT ELEV=258.0
NOTES
i. SEE DESIGN PLANS FOR SPECIFIED DIMENSIONS OF RISER.
2. TRASH RACK DIMENSION CRITERIA SPECIFIED IS APPROXIMATE AND VARIES BY MANUFACTURER.
3. INSTALLATION OF TRASH RACK SHALL BE ACCORDING TO MANUFACTURER'S RECOMMENDATIONS.
4. ALL COMPONENTS OF TRASH RACK SHALL BE OF STAINLESS STEEL OR OTHER NON -CORROSIVE MATERIAL.
5. ALL MOUNTING HARDWARE SHALL BE OF STAINLESS STEEL OR OTHER NON -CORROSIVE MATERIAL,
TRASH RACK
DN CORROSIVE MATERIAL /! w 5.5"
0 5.5' SPACING
i 1 �
O I 1 t
RISER
TRASH RACK SHALL BE INSPECTED
PERIODICALLY AND ANY DEBRIS ON
THE TRASH RACK IS TO BE REMOVED
AND PROPERLY DISPOSED OF
TRASH RACK DETAIL
FOFLEBAY TOP ELEV= 261.0
WIDTH AT TOP = 2.0 FT
FOREBAY ENTRANCE SHALL BE -
DEEPER THAN FOREBAY EXIT
POND ELEV.=259.0
e PVC SCREW CAP
FOR CLEANING ACCESS
12' MIN.
4"x4' PVC
le MIN.
l f DIA. HOLE DRILLE
INTO BOTTOM CAP
PVC DRAIN OUTLET
SCALE: N.T.S.
NOTE: PUMPS SHALL BE USED TO DRAIN
SEDIMENT STORAGE THE FOREBAY WHEN NECESSARY. REFER TO DETAIL
TOP THIS SHEET FOR DEWATERING REQUIREMENTS.
FOREBAY BOTTOM S�
ELEV=257.5
NORMAL POND ELEVATION
BOTTOM LITTORAL SHELF ELEV, f-1
BOTTOM OF SEDIMENT
STORAGE/EXIT
E-EV=257.0
FOREBAY ENTRANCE SHALL BE FOREBAY
DEEPER THAN FOREBAY EXIT
�- - 6" TOPSOIL FOR ALL
AREAS ABOVE THE
NORMAL POND ELEVATION
BOTTOM OF SEDIMENT
STORAGE/ENTRANCE
Ei EV=256.5
SHALLOW LAND ZONE
HERSA41OUS PLANTS SHALLOW WATER ZONE
HERMACEOUS PLANTS
POND
_ (NORMAL POOL)
1
6
TYPICAL LITTORAL SHELF VEGETATION DETAIL
SCALE: N.T.S.
SCIENTIFIC NAME
COMMON NAME
PLANTING ZONE
QUANTITY
NURSERY CONTAINERTYPE
SPACING
PLANTING SEASON
Janus effesus
Soft Rush
SHALLOW WATER
188
PEAT POT
6' O.C.
SPRING/SUMMER
Iris Wrglnfca
Blue Flag Iris
SHALLOW WATER
188
PEAT POT
6' O.C.
SPRING/SUMMER
Schoenoplectus tobernoemontani
Soft Stem Bulrush
SHALLOW WATER
188
PEAT POT
6' O.C.
SPRING/SUMMER
Eupatoriodelphus maculatus
Spotted Trumpetweed
SHALLOW WATER
188
PEAT POT
6, O.C.
SPRING/SUMMER
Eupatorfum purpureum
Joe-Pye Weed
SHALLOW WATER
188
PEAT POT
6' O.C.
SPRING/SUMMER
Rhynchospora colorata
Starrush Whitetop
SHALLOW WATER
188
PEAT POT
6' O.C.
SPRING/SUMMER
STORMWATER MANAGEMENT DESIGN WET DETENTION -POND #1:
RIVER BASIN:
RECEIVING STREAM:
STREAM INDEX:
STREAM CLASS:
HUC:
PROJECT COORDINATES:
POND DESIGN SUMMARY
CAPE FEAR
LITTLE RIVER (LOWER LITTLE RIVER)
18-23-(10.7)
WS-III;HOW
0303000403
35.237786'N,-79.278201
DRAINAGE AREA TO POND:
8.83 ACRES
SITE IMPERVIOUS AREA TO POND:
AREA 7o POND:
3,21 ACRES
0.0 ACRES_-
OFF -SITE DESIGN IMPERVIOUS
TOTAL DESIGN IMPERVIOUS AREA TO POND:
3.21 ACRES
PRE -DEVELOPED
POST -DEVELOPED POST DEVELOPED
TO POND THROUGH POND
DRAINAGE AREA:
TO POND
8.83 AC
8.83 AC
CURVE NUMBER:
67.4
80.4
TIME OF CONCENTRATION:
18.1 MIN
5 MIN
1.0" STORM EVENT
0.319 CFS
0.024 CFS
1-YEAR STORM EVENT:
5.557 CFS
20.11 CFS
1.660 CFS
2-YEAR STORM EVENT:
9.398 CFS
27.54 CFS
3.889 CFS
10-YEAR STORM EVENT:
21.71 CFS
49.16 CFS
12.03 CFS
®100-YEAR STORM EVENT:
44.48 CFS
84.04 CFS
24.56 CFS
STAGE/STORAGE TABLE
STAGE (FT)
ELEVATION (FT)
CONTOUR AREA
(SF)
INCREMENTAL
STORAGE (CF)
TOTAL STORAGE
(CO
0.0
259.
13835
0
0
0.5
259.5
16365
7550
7550
0.8
259.8
17215
5037
12587 (WQV)
1.0
260.0
17785
3500
16087
2.0
261.0
20665
19225
35312
3.0
262.0
23895
22280
57592
4.0
263.0
26330
25113
82705
4.5
263.5
27570
13475
96180
TYPICAL LITTORAL SHELF PLANTING SCHEDULE
OPERATION & MAINTENANCE
BMP element:
Potential roblem:
How I will remediate the problem
The entire BMP
Trash debris is present
Remove the trash debris
® enm er of the wet
etention bosun
Areas of bare soil and/or
erosive gullies have formed
egr'I e nec e s essary o
remove the gully, and then plant
a ground cover and water until it
is established. Provide Ilme and
a one-time fertilizer application
Vegetation is too short or too
long
Main a n v on a s e g
of approximately six inches.
The Inlet device: pipe or
®Ie
The pipe is dogged.
Unclog the pipe. Dispose of the
sediment off -site.
The p pe s craC a or
otherwise dame
ace e pipe.
r an c nil in the
swole,
Regre a e swa a necessary
to n oth it over and provide
erosion control devices such as
reinforced turf matting our riprop
to avoid future problems with
erosion.
e farebay
Sediment has accumulated to
a depth greater than the
alainal deslgn depth for
sediment storage.
Search for the source of the
sediment and remedy the
problem if possible. Remove the
sediment and dispose of it in a
location where it will not case
Impacts to streams or the Bi
roaon hue occu
row e a I was erosion
protection such as reinforced turf
mattm or riprop if needed to
revel future erosion Rroblerns.
ee s are present
Remove the wee s, pr era y by
hand. If t.cide is used, wipe It
on the pants rather than
in
s ra .
The vegetated s
es '"fessiond practices
show that pruning Is needed
to maintain optimal plant
hedih.
Prune according to best
professional practices
Plants are dead, diseased or
dying.
Determine the source of the
problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants. Provide a
one-time fertilizer application to
establish the ground cover If a
sot test indicates it is necessar .
Weeds are present
emote the wee s1 preferably DX
hand. If pesticide Is used, Imps It
on the plants rather than
sran.
The main treatment area
Sediment has accumulated to
a depth greater than the
original design sediment
storage depth.
Search far the source of the
sediment and remedy the
problem if possible. Remove the
sediment and dispose ofit in a
location where it will not case
hDacts to streams or the BMP.
Al gar growth covers over
of the area.
Consulta o ess ono o remove
and control the al a arowth.
aI s, ragm a other
Invasive plants cover 50% Ofthen
Remove a plants wiping
with pesticide do no
the basin surface.
s ra
e em n en
ru s ave s a e o grow
on the embankment
emote shrubs man ar e y.
w ence -9f muskrat or beaver
activity is present.
Use traps to remove mus a s
and consult a professional to
remove beavers.
A tree has started to grow on
the embankment.
An annual innspection by an
appropriate professional shows
that the embankment needs
Consult a dam safety specialist
to remove the tree.
Make all needed repayi
repair. if applicable)
The outlet device
Clogging has occurred.
can out a ou a ce.
Dispose of the sediment off -site.
The oailet device is damaged
Reppir or replace the outlet
device.
e receiving water
Erosion or other signs of
damage have occurred at the
outlet,
Contact the local NC Division of
Water Quality Re glonai Office, our
the 401 Oversight Unit at
919-733-17B6.
75 F_
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051571
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C' ®•NGI NEON'
r,rrArrs+
PLAN STATUS
01 /26/22
INITIAL SUBMISSION
03/14/22
LAYOUT REVISION
11/14/22
NCDEQ COMMENTS
DATE
CEP
DESIGN
DESCRIPTION
CEP CEP
DRAWN CHKD

rF
ONSTRUCTION SEQUENCE
OR WET DETENTION POND:
1. INSTALL EROSION CONTROLS.
2. CONSTRUCT DAM BASE AND AREAS BELOW THE
NORMAL POOL. CONSTRUCTION TO BE
PERFORMED UNDER THE INSPECTION OF THE
GEOTECHNICAL ENGINEER. SEED UPON
COMPLETION. 4' MIN
3. INSTALL OUTLET PIPE, RIP -RAP APRON AND EMBANKMENT WIDTH
STONE FILTER RING,
4. CONSTRUCT OUTLET STRUCTURE. a TOPSOIL FOR ALL
AREAS ABOVE THE TRASH RACK
5, REMOVE ACCUMULATED SEDIMENT AND SEED NORMAL POND ELEVATION REFER TO DETAIL
UPON COMPLETION. THIS SHEET
roo c�,
�R
e Z5s4
c �6'•�@
TOP OF STRUCTURE NOT SHOWN FOR CLARITY
(REMOVABLE TRASH RACK)
24' HDPE WITH WATER TIGHT SEAL
PIPE TO BE BEDDED TOP of EMBANKMENT ELEVATION=257.0 OUTLET CONTROL STRUCTURE - INCREMENTAL WEIR
PER DIRECTION OF GEOTECHNICAL 6" TOPSOIL ABOVE NOTE: EL STORM ELEVATION IS IS AD AND INTERMEDIATE
_ _ _ _ WtIR IS ELEVATION 253.8. THERE IS ADDITIONAL STORAGE SCALE: N.T.S.
ENGINEER 2 6" CLAY LINER REFER TO DETAIL Too YEAR STORM ELEVATION=255.93
- �-� DESIGNED FROM. THE 1.0° STORM ELEVATION TO THE
_� ON LITTORAL SHELF FOR INCREMENTAL INTERMEDIATE WEIR ELEVATION.
1 I 6 CLAY SOIL
3 WEIR fi
LINER ON INSIDE ^I I TOPSOIL FOR ALL
FACE OF ,. AREAS ABOVE THE
EMBANKMENT 10 WAR STORM EI FVATlON=255.32
' Iv 1
NORMAL POND ELEVATION
I, g Iz
- 44' PRECAST FOREBAY BER
6FT LITTORAL I Imo- I 1 QUSCRETE REIPS 2 YEAR STORM ELEVATION=254.55
SHELF -- ATALL STEPS
S NECESSARY)
-�-1 ,-- 1 YEAR STORM ELEVATION=254.23 6' TOPSOIL ABOVE
6" CLAY LINER 3:1
I ON LITTORAL SHELF
INV--253.0 1.0-INCH STORM ELEVATION=253.26 EXISTING GRADE=254.0t ff
NORMAL POND ELEVATION=253.0 `I
6FT U SHELF 6.1 I jam/
s PVC ELBOW
3' MIN SEE DETAIL'...a® �..a�'e.��'� ..�`��..�'e.�`•,_..�' ....� `.�
1 ELEV--251.0 9A rs I I (� 1.75 NOTE: PUMPS SHALL BE USED TO GRAIN
A 1 THE POND WHEN NECESSARY. REFER TO DETAIL
THIS SHEET FOR DEWATERING REQUIREMENTS.
4' IN. ASTM 0-923 SEAL
KEY BETWEEN BARREL. & RISER.
RISER BASE TO BE FILLED
CUTOFF TRENCH WITH CONC. TO INVERT OF III � BOTTOM OF POND (TOP OF SEDIMENT STORAGE)=248.0
APPROXIMATE SIZE BARREL Offia TE SHALL BE
EXCAVATE AND BACKFILL 8'X8°Xi'X12' LONG ANGLE (6 TOT. REQUIRED) TO ANCHOR RISER TO PLACED IN
A RISER AFTER I I I
WITH COMPACTED BASE PROVIDE 2-3/47tl A307 BOLTS FROM ANGLE TO RISER AND ANGLES 0 BASE ARE ND RISER.SECURED�_� f�-�(BOTTOM OF SEDIMENT STORAGE)=247.0
STRUCTURAL FILL AS 2-A307 J" HOOKS 3/4 DIA. X 12" LONG FROM ANGLE TO BASE.
ANGLE TO BE FIELD COATED WiTH ZINC RICH PAINT AFTER
DIRECTED BY GEOTECHNICAL CONSTRUCTION. "J" HOOKS TO BE PLACED UNDER LOWER REINFORCING
ENGINEER STEEL 6" CLAY SOIL
5'x5'x1.5' OONC. BASE REINFORCE WITH #4 BARS AT 12" O.C. TOP LINER
AND BOTTOM OF EACH DIRECTION PROVIDE 3° MIN. CLEARANCE MAIN POOL
73'-24" HOPE ® 4.11% BETWEEN EDGE OF CONC, AND STEEL REINFORCING.
PROFILE OF WET POND DETENTION SYSTEM
SCALE: N.T.S.
LTER MEDIA (SEE NOTE 2)
SILT FENCE AS NEEDED LIMP
FL
STORMWATER MANAGEMENT NOTES:
( 1. THE DEVELOPER OR HIS AGENT SHALL CONTACT THE DESIGN ENGINEER WHEN
_ ,c2 THE BEST MANAGEMENT PRACTICE(S) ARE CONSTRUCTED AND ABOUT TO
0*_ BECOME OPERATIONAL 50 A FINAL INSPECTION CAN BE PERFORMED TO
DETERMINE COMPLIANCE WITH THE APPROVED PLAN CAN BE PERFORMED, TRASH RACK
NM: ATER LEVEL 2, ANNUAL MAINTENANCE INSPECTION AND REPORT REQUIRED - THE OWNER OF
A PERMITTED STRUCTURAL STORMWATER BMP/CONTROL SHALL ANNUALLY
SUBMIT A MAINTENANCE AND INSPECTION REPORT FOR EACH BMP TO THE
1. PRIOR TO INSTALLATION, MANUFACTURER SPECIFICATIONS OF FILTER MEDIA SHALL BE REVIEWED TO STORMWATER ADMINISTRATOR. ANNUAL INSPECTIONS SHALL 13EGIN WITHIN
ENSURE THAT DISCHARGE FROM FILTER MEDIA SHALL MEET OR EXCEED THE PROVISIONS OF THE CLEAN ONE YEAR OF THE RECORDATION OF ANY DEED(S) SHOWING STORMWATER I I
WATER ACT. ji j BMPs/CONTROL STRUCTURES
Z ENSURE THAT PUMP PRESSURE DOES NOT EXCEED FILTER MEDIA PRESSURE RATING. l 3. UPON COMPLETION OF THE PROJECT, AND BEFORE A CERTIFICATE OF I I
OCCUPANCY SHALL BE GRANTED, THE ENGINEER OF RECORD SHALL CERTIFY
3. FILTER MEDIA MAY BE, BUT NOT LIMITED TO, SAND MEDIA FILTRATION DEVICES, RATED FILTER FABRIC 1- THAT THE COMPLETED PROJECT IS IN ACCORDANCE WITH THE APPROVED I I
BAGS OR POLYMER BASED DEWATERING PRACTICES. -Ir'r- STORMWATER MANAGEMENT PLANS AND DESIGNS.
- I r
4. A FINAL INSPECTION OF THE SITE AND STORMWATER MANAGEMENT
F flu
4. PUMP STRAINER SHALL NOT BE IN CONTACT WiTH BOTTOM OF POND.
��_ - j�1 - 11 � BMP/CONTROLS TO BE SCHEDULED WITH AND COMPLETED BY THE PROJECT
jj I I I i ENGINEER.
BMP POND DEWATERING LOW POINT 5. NCDEQ AND THEIR ASSIGNS HAVE RIGHT TO ACCESS THE STORMWATER
CONTROL(s) FOR INSPECTIONS OR MAINTENANCE AS NECESSARY.
RiSC
U. THE ENGINEER'S %E_ "riCATION OF CIIvIPLETION WALL BE REQUIRED PRIOR TO
SEEDBED PREPARATION: THE FINAL PLAT OR CERTIFICATE OF OCCUPANCY, THE STORMWATER
1. CHISEL COMPACTED AREAS AND SPREAD TOPSOIL THREE INCHES DEEP OVER ADVERSE SOIL CONDITIONS, IF CONTROL IS TO BE INSPECTED TO ENSURE IT IS FUNCTIONING AS DESIGNED
AND HAS FULL DESIGN VOLUME PWOR TO ISSUANCE OF THE FINAL
AVAILABLE.
2. RIP THE ENTIRE AREA TO SIX INCHES DEEP. CERTIFICATE OF OCCUPANCY.
J. REMOVE ALL LOOSE ROCK, ROOTS AND OTHER OBSTRUCTIONS, LEAVING SURFACE REASONABLY SMOOTH AND 7. THE PROPERTY OWNER IS RESPONSIBLE FOR MAINTAINING THE STORMWATER
UNIFORM. CONTROLSW ACCORDING TO THE APPROVED MAINTENANCE PLAN AND
4. APPLY AGRICULTURAL LIME, FERTILIZER, AND SUPERPHOSPHATE UNIFORMLY AND MIX WITH SOIL (SEE SEEDING DIRECTION OF NCDEQ
MIXTURE).
5. CONTINUE TiLLAGE UNTIL A WELL -PULVERIZED, FiRM, REASONABLY UNIFORM SEEDBED IS PREPARED FOUR TO SIX �\ �� �► � ��,,o �\ � - - - - - - -
INCHES DEEP.
6. SEED ON A FRESHLY PREPARED SEEDBED AND COVER SEED LIGHTLY WITH SEEDING EQUIPMENT OR CULTiPACK
AFTER SEEDING.
7. MULCH IMMEDIATELY AFTER SEEDING AND ANCHOR MULCH.
8. INSPECT ALL SEEDED AREAS AND MAKE NECESSARY REPAIRS OR_RE-SEEDINGS WITHIN THE PLANTING SEASON, IF / �\
POSSIBLE. IF STAND SHOULD BE MORE THAN 60% DAMAGED, RE-ESTABLISH FOLLOWING THE ORIGINAL LIME, \�
FER11UZER AND SEEDING RATES.-
9. 'CONSULT 5&EC ENVIRONMENTAL ENGINEERS ON MAINTENANCE TREATMENT AND FERTILIZATION AFTER PERMANENT
COVER IS ESTABLISHED.
LANDSCAPING NOTES: �' , OP 0 EMBA
' ELE'
ALL LANDSCAPING SHALL BE IN COMPLIANCE WITH THE NCDEQ BMP REQUIREMENTS.
;LANDSCAPE CONTRACTOR SHALL. PROVIDE ATWO-YEAR WARRANTY FOR BMP PLANTING SURVIVAL/REPLACEMENi.
AT THE END OF THE FIRST YEAR AND AT THE END OF THE TWO-YEAR WARRANTY PERIOD, ALL PLANTS THAT DO NOT
SURVIVE MUST BE REPLACED.
ESTABLISHMENT PROCEDURES, SUCH AS CONTROL OF INVASIVE WEEDS, ANIMAL AND VANDAL DAMAGE, MULCHING,
RE -STAKING, WATERING, AND MESH OR TUBE PROTECTION REPLACEMENT, SHALL BE IMPLEMENTED TO THE EXTEND �•,, � � 1,
NEEDED TO ENSURE PLANT SURVNAL. STAKING MUST BE REMOVED AFTER ESTABLISHMENT (APPROXIMATELY 12 -�
MONTHS), TO PREVENT GIRDLING (STRANGLING) OF ALL WOODY PLANTS. �\
SOD WITHIN BMP AND SURROUNDING AREAS TO BE BERMUDA OR CENTIPEDE GRASS, '- -'''� U
I
GRASS OR WILDFLOWER SEED MUST BE APPLIED AT THE RATES SPECIFIED BY THE SUPPLIERS. IF PLANT
ESTABLISHMENT CANNOT BE ACHIEVED WITH SEEDING BY THE TIME OF SUBSTANTIALCOMPLETON OF THE STORMWATER
E
FACILITY PORTION OF THE PROJECT, THEN THE CONTRACTOR SHALL PLANT THE AREA WITH WILDFLOWER SOD, PLUGS,
CONTAINER PLANTS, OR OTHER MEANS TO COMPLETE THE SPECIFIED PLANTING AND PROTECT AGAINST EROSION
BEFORE WATER IS ALLOWED TO LINTER THE STORMWATER BMP FACILITY.
ALL MATERIALS SHALL BE ACQUIRED FROM AN APPROVED NCDEq PLANT VENDOR. 'PLANT MATERIAL 5'FIOIILD BE
PURCHASED FROM A LOCAL SOURCE TO ENSURE SURVIVABILITY. LOCAL VENDORS FOR THIS SITE INCLUDE:
- CILL IDE NATIVE PLANT NURSERY 919-662-5566 �� 3y-2(i'nH
- GROWING WILD NURSERY 910-259-6361 `o 1 0
NC FOREST SERVICE 919-731-7988 `. R-GH
- PLANT DELIGHTS NURSERY 919-772-4794
TARHEEL NATIVE TREES 919-553-5927
IMMEDIATELY AFTER THE WET DETENTION BASIN IS ESTABLISHED, THE PLANTS ON THE VEGETATED SHELF AND
PERIMETER OF THE BASIN SHOULD BE WATERED TWICE WEEKLY IF NEEDED UNTIL THE PLANTS BECOME ESTABLISHED ` s
(COMMONLY SIX WEEKS) _ NO PORTION OF THE WET DETENTION POND SHOULD BE FERTILIZED AFTER THE FIRST INITIAL FERTILIZATION THAT IS
REQUIRED TO ESTABLISH THE PLAITS ON THE VEGETATED SHELF.
LANDSCAPING NOTES:
1. CONTRACTOR SHALL COMPLY WITH ALL APPLICABLE CODES AND ORDINANCES REGARDING LANDSCAPING,
2. IT IS THE RESPONSIBILITY OF THE CONTRACTOR TO ESTABLISH A HEALTHY STAND OF GRASS ON ALL SEEDED
AREAS. CATC qASI
3, CONTRACTOR SHALL PROVIDE NATURAL TOPSOIL THAT IS FERTILE, FRIABLE, WITHOUT MIXTURE OF SUBSOIL
MATERIALS, AND OBTAINED FROM A WELL DRAINED, AVAILABLE SITE. IT SHALL NOT CONTAIN SUBSTANCES
1V= 5OI
WHICH MAY BE HARMFUL TO PLANT GROWTH. TOPSOIL SHALL BE SCREENED AND FREE FROM CLAY, LUMPS,
STONES, ROOTS, PLANTS, OR SIMILAR SUBSTANCES 1" OR MORE IN DIAMETER, DEBRIS, OR OTHER OBJECTS
WHICH MIGHT BE A HINDERANCE TO PLANTING OPERATIONS. TOPSOIL SHALL CONTAIN AT LEAST 4-67. ORGANIC
MATTER BY WEIGHT AND HAVE A PH RANGE OF 5.5 TO 7.0.
4. CONTRACTOR SHALL BE RESPONSIBLE FOR THE WATERING AND THE MAINTENANCE OF ALL LANDSCAPED AREAS
UNTIL THE LATER OR (a) THIRTY (30) DAYS FOLLOWING THE PLANTING OF THE GRASS AND SHRUBS, OR (b)
THE DATE THAT STORE OPENS FOR BUSINESS TO THE PUBLIC. CONTRACTOR SHALL ALSO BE RESPONSIBILITY q
FOR THE SURVIVAL OF THE BMP PLANTING MATERIALS DURING THE TWO-YEAR WARRANTY PERIOD AND SHALL
REPLACE ALL PLANTS THAT DO NOT SURVIVE AT THE END OF THE FIRST YEAR AND AT THE END OF THE T
SECOND YEAR OF THE WARRANTY PERIOD. GRAPHIC. SCALE
5. CONTRACTOR TO VERIFY QUANTITIES PRIOR TO COMMENCING WORK.
6. ANY DISTURBED AREAS NOT SCHEDULED FOR HANDSCAPE, PLANTINGS, OR MULCH SHALL BE SEEDED LAWN. 40 a 20 40 80 180
REFER TO SITE PLAN FOR LOCATION OF AREAS TO BE SODDED.
7. NO PLANT SUBSTITUTIONS ARE PERMITTED WITHOUT WRITTEN APPROVAL OF THE OWNERS REPRESENTATIVE. PLAN VIEW
8. FOR NEW PLANTING AREAS, REMOVE ALL PAVEMENT, GRAVEL SUB -BASE AND CONSTRUCTION DEBRIS; REMOVE
COMPACTED SOiL AND ADD 18" NEW TOPSOIL, OR TILL AND AMEND THE TOP 18' OF EXISTING SOIL TO MEET
TOPSOIL/PLANTING MIX STANDARDS FOR TREES. ( IN FEET )
9. ADJUST TREE PLANTING LOCATIONS TO AVOID UNDERGROUND UTILITIES, PLANT 15 FROM ALL UNDERGROUND 1 inch = 40 ft.
UTILITIES (SEWER AND STORM DRAINAGE, GAS, WATER, PHONE, AND ELECTRICAL LINES.)
Cad file name: P48- : 0DoubleD 022-Long Point Road77issinq permit 220061 CADD 048-022-SWD #2.dwq
RISER STRUCTURE
4" PVC SCREW CAP -
FOR CLEANING ACCESS
12' MIN.
4"x4" PVC TEE
1"DIA, HOLE DRILLED
INTO BOTTOM CAP
PVC DRAIN OUTLET
SCALE: N.T.S.
NOTE: PUMPS SHALL BE USED TO DRAIN
SEDIMENT STORAGE THE FOREBAY WHEN NECESSARY. REFER TO DETAIL
TOP THIS SHEET FOR DEWATERING REQUIREMENTS,
FOREBAY BOTTOM 'y1
ELEV=251.5
NORMAL POND ELEVATION
BOTTOM LITTORAL SHELF EI.EV. __e�
CLASS 2 RIP -RAP
COVERED WITH CLASS A RIP -RAP
OVER FILTER FABRICi
MIN. 6' WEIR AT ELEV=252.5
ILI -i -
6 TOPSOIL FOR ALL
I -.,s -
FOREBAY ENTRANCE SHALL BE 4 --I � �. -� I I- - AREAS ABOVE THE
DEEPER THAN FOREBAY EXIT NORMAL POND ELEVATION
BOTTOM OF SEDIMENT
STORAGE/EXIT BOTTOM OF SEDIMENT
ELEV=251.0 STORAGE/ENTRANCE
ELEV=250.5
FOREBAY ENTRANCE SHALL BE FOREBAY
DEEPER THAN FOREBAY EXIT
1. SEE DESIGN PLANS FOR SPECIFIED DIMENSIONS OF RISER.
2. TRASH RACK DIMENSION CRITERIA SPECIFIED IS APPROXIMATE AND VARIES BY MANUFACTURER,
3. INSTALLATION OF TRASH RACK SHALL BE ACCORDING TO MANUFACTURER'S RECOMMENDATIONS.
4. ALL COMPONENTS OF TRASH RACK SHALL BE OF STAINLESS STEEL OR OTHER NON -CORROSIVE MATERIAL
5. ALL MOUNTING HARDWARE SHALL BE OF STAINLESS STEEL OR OTHER NON -CORROSIVE MATERIAL.
TRASH RACK
ON CORROSIVE MATERIAL i i i �� 5.5
0 5.5° SPACING
t
RISER
TRASH RACK SHALL BE INSPECTED
PERIODICALLY AND ANY DEBRIS ON
THE TRASH RACK IS TO BE REMOVED
AND PROPERLY DISPOSED OF
TRASH RACK DETAIL
FOREBAY TOP E-EV 255.0
WIDTH AT TOP = 2.0 FT
SHALLOW LAND ZONE
HERBACEOUS PLANTS SHALLOW WATER ZONE
HERBACEOUS PLANTS
POND
(NORMAL POOL)
s
TYPICAL LITTORAL SHELF VEGETATION DETAIL
SCALE. N.T.S.
SCIENTIFIC NAME
COMMON NAME
PLANTING ZONE
QUANTITY
NURSERY CONTAINERTYPE
SPACING
PLANTING SEASON
Jancus effesus
Soft Rush
SHALLOW WATER
69
PEAT POT
6' O.C.
SPRING/SUMMER
Iris virgintca
Blue Flag Iris
SHALLOW WATER
69
PEAT POT
6' O.C.
SPRING/SUMMER
Schoenoplectus tobemaementani
Soft Stem Bulrush
SHALLOW WATER
69
PEAT POT
6' O.C.
SPRING/SUMMER
Eupotoriadelphus maculatus
Spotted Trumpetweed
SHALLOW WATER
69
PEAT POT
6' O.C.
SPRING/SUMMER
Eupatorium purpureum
Joe-Pye Weed
SHALLOW WATER
69
PEAT POT
6' O.G.
SPRING/SUMMER
Rhynchosporo colorata
Starrush Whltetop
SHALLOW WATER
69
PEAT POT
6' O.C.
SPRING/SUMMER
STORMWATER MANAGEMENT DESIGN WET DETENTION POND #2:
RIVER BASIN: CAPE FEAR
RECEIVING STREAM: LITTLE RIVER (LOWER LITTLE RIVER)
STREAM INDEX: 18 23-(107)
STREAM CLASS: WS-111;HQW
HUC: 0303000403
PROJECT COORDINATES: 35.237786'N,-79.278200'W
POND DESIGN SUMMARY
DRAINAGE AREA TO POND: 2.62 ACRES
SITE IMPERVIOUS AREA TO POND: 1.09 ACRES
OFF-SIIE DESIGN IMPERVIOUS AREA To POND: 0.0 ACRES
TOTAL DESIGN IMPERVIOUS AREA TO POND: 1.09 ACRES
PRE -DEVELOPED POST -DEVELOPED POST DEVELOPED
DRAINAGE AREA:
2.62 AC
2.62 AC
CURVE NUMBER:
74.9
84.0
TiME OF CONCENTRATION:
10 MIN
5 MIN
1.0" STORM EVENT:
0.250 CFS
0.012 CFS
1-YEAR STORM EVENT:
3.729 CFS
7.017 CFS
0,958 CFS
2-YEAR STORM EVENT:
5.452 CFS
9.366 CFS
2.182 CFS
10-YEAR STORM EVENT:
10.69 CFS
15.91 CFS
6.084 CFS
100-YEAR STORM EVENT:
19.60 CFS
26.26 CFS
19.11 CFS
STAGE/STORAGE TABLE
STAGE (FT)
EIEVATI((NNN (F T)
CONTOUR AREA
(SF)
INCREMENTAL
STORAGE (CF)
TOTAL STORAGE
(CF)
0.0
253.0
4180
0
0
0.5
253.5
5300
2385
2385
0.8
253,E
5765
1669
4054 (WQV)
1.0
254.0
6040
1181
5234
2.0
255.0
6760
6400
11634
3.0
256.0
8165
7463
19097
4.0
257.0
9590
8878
27974
STORMWATER MANAGEMENT SYSTEM DETAILS
1 NOT TO SCALE
TYPICAL LITTORAL SHELF PLANTING SCHEDULE
OPERATION & MAINTENANCE
BMP element:
Potential roblem:
How I will remediate the problem
e entire BMP
Trash debris is present
Remove the trash debris
e Perimeter at e wet
etention bash
Areas of bare soil and/or
erosive gullies have formed
Regrade the soll If necessary o
remove the gully, and then plant
a Bound cove and water until it
is established. Provide lime and
a one-time fertilizer application
Vegetation is too short or too
iong
Maintain vegetation at s height
of approximately six Inches.
e inlet device: pie or
wale
The pipe is dogged.
Unclog the �tpe. Dispose of the
sediment o -site.
e p e s crac or
otherwise dame
Replace the pipe.
Froslon is occurring in e
Swale.
egra e e swa c necessary
to SI11aath tt over and provide
erosion control devices Bch as
reinforced turf matting or riprap
to avoid future problems with
erosion.
e forebay
Sediment has accumulated to
Search for the source of the
a depth greater than the
orkinal design depth for
se, ment storage.
sediment and remedy the
problem if possible. Remove the
sediment and dispose of it in a
location where it will not cause
Impacts to streams or the BMP•
Erosion has occur .
Provide aciditional erosion
protection such as reinforced turf
matting or riprap if needed to
revent future erosion Problems.
ee s _arepreseflE
Remove the weeds, preferably by
hand. If pesticide is used, vmpe it
on the pants rather than
wain.
e vegetated shelf
Bestprofessional practices
show that pruning is needed
to maintain optimal plant
health.
Prune according to best
professional practices
Plants are dead, diseased or
Determine the source of the
dying.
problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants. Provide a
one-time fertilizer application to
establish the ground cover if a
soli test Indicates it is necessary.
fiedu are ixesenRemove
the weeds, prefera y y
hand. If pesticide is used, wipe it
on the plants rather than
spraying.
e main treatment area
Sediment has accumulated to
Search for the source of the
a depth greater than the
original dalqn sediment
storage depth.
sediment and remedy the
problem if possible. Remove the
sediment and dispose of it in a
location whore it will not cause
impacts to streams or the BMP.
ga gro coves over
of the area.
onsu a pro ess one o remove
and control the alqal Qrowth.
Cottat s, ragm es or er
invasive plants cover 50% of
the basin surface.
emove a an s wiping
them with pesticide do no
spray)
e embankment
Shru s have started to grow
on the embankment
Remove shrubs Immediately.
v7 ence of muskrat or beaver
activity is present.
Use rope o remove mu3kralis
and consult a professional to
remove beavers.
A Iree has started to grow on
the embankment.
Consult a dam safety specialist
to remove the tree,
An annual innspeetion by an
��propprtate rofessional shows
thai the embankment needs
Mace all needed repairs.
re air, if applicable)
e outlet device
Clogging has occurred.
Disco of the sediment off -site, -out the outlet
The outlet device is damaged
Keppir or replace the outlet
devim
e receiving water
Erosion or other signs of
domoge have occurred at the
vut►et.
Contact the local NC Division of
Water Quality Regional Office, or
the 401 Overslght Unit at
919-733-1786.
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051571
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AN STATUS
01 /26/2
INITIAL SUBMISSION
0311412re
LAYOUT REVISION
11/14/22
NCDEQ COMMENTS
DATE
CEP
DESIGN
DESCRIPTION
CEP CEP
DRAWN CHKD
SCALE
H: i = 4U•
V:
OB No.
048-022
DATE
JANUARY 26, 202
FILE No.
SHEET

RIP -RAP PRE-TREATMENT
FOREBAY AT PIPE INLETS
SEE DETAIL THIS SHEET
STORMWATER MANAGEMENT NOTES:
TOP OF EN
100-YEAR STORM E
1. THE DEVELOPER OR HIS AGENT SHALL CONTACT THE DESIGN ENGINEER WHEN
THE BEST MANAGEMENT PRACTKE(S) ARE CONSTRUCTED AND ABOUT TO
SPILLWAY I
BECOME OPERATIONAL SO A FINAL INSPECTION CAN BE PERFORMED TO
10-YEAR STORM E
DETERMINE COMPLIANCE WITH THE APPROVED PLAN CAN BE PERFORMED;
2. ANNUAL MAINTENANCE INSPECTION AND REPORT REQUIRED - THE OWNER OF
EXISTING GRADE = 248.3 2-YEAR STORM EL
A PERMITTED STRUCTURAL STORMWATER BMP/CONTROL SHALL ANNUALLY
SUBMIT A MAINTENANCE AND INSPECTION REPORT FOR EACH BMP TO THE
STORMWATER ADMINISTRATOR. ANNUAL INSPECTIONS SHALL BEGIN WITHIN
1-YEAR STORM E
ONE YEAR OF THE RECORDATION OF ANY DEED(S) SHOWING STORMWATER
1.0' RAINFALL El
BMPe/CONTROL STRUCTURES
BOTTOi
3. UPON COMPLETION OF THE PROJECT, AND BEFORE A CERTIFICATE OF
OCCUPANCY SHALL BE GRANTED, THE ENGINEER OF RECORD SHALL CERTIFY
THAT THE COMPLETED PROJECT IS IN ACCORDANCE WITH THE APPROVED
�•...®'
STORMWATER MANAGEMENT PLANS AND DESIGNS.
4, A FINAL INSPECTION OF THE SITE AND STORMWATER MANAGEMENT
BMP/CONTROLS TO BE SCHEDULED WITH AND COMPLETED BY THE PROJECT
ENGINEER,
5. NCDEQ AND THEIR ASSIGNS HAVE RIGHT TO ACCESS THE STORMWATER
CL
CONTROL(s) FOR INSPECTIONS OR MAINTENANCE AS NECESSARY.
c
6. THE ENGINEER'S CERTIFICATION OF COMPLETION WILL BE REQUIRED PROR TO
r
THE FINAL PLAT OR CERTIFICATE OF OCCUPANCY. THE STORMWATER
CONTROL IS TO BE INSPECTED TO ENSURE IT IS FUNCTIONING AS DESIGNED
AND HAS FULL DESIGN VOLUME PRIOR TO ISSUANCE OF THE FINAL
CERTIFICATE OF OCCUPANCY.
z
7. THE PROPERTY OWNER IS RESPONSIBLE FOR MAINTAINING THE STORMWATER
N
CONTROLS(s) ACCORDING TO THE APPROVED MAINTENANCE PLAN AND
DIRECTION OF NCDEQ.
SEASONAL HIGI
OPERATION & MAINTENANCE PROVISIONS (INFILTRATION)
BMP element:
Potentialproblem:
How to remediate the problem
e entire infiltration basil
Trash/debris is present
Remove the trash/debris
e grass filter strip or other pretreatment
Areas of bare sail and/or erosive gullies
Regrade the son if necessary to remove
area
have farmed
the gully, plant ground cover and water
until established. Provide lime and a
one-time fertilize- application
Sediment has accumulated to a depth
Search for the source of the sediment and
greater than three inches
remedy the problem if possible. Remove
the sediment and dispose of it In a
location where it will not cause impacts
to streams or the SCM
e flow diversion structure (if applicable)
The structure is dogged
Unclog the conveyance and dispose of any
sediment In a location where It will not
cause impacts to streams or the SCM
The structure is damaged
Make any necessary repairs or replace if
damage is too much for repair
e inlet device
The inlet pipe Is dogged (if applicable)
Unclog the pipe and dispose of any
sediment. in a location where it will not
cause impacts to streams or the SCM
The inlet pipe is cracked or otherwise
damaged (if applicable)
Repair or replace the pipe
Erosion is occurring in the Swale
Regrade the Swale if necessary and
(if applicable)
provide erosion control devices such as
reinforced turf matting or rip -rap to avoid
future erosion problems
Stone verge Is dogged or covered in
Remove sediment and clogged stone and
sediment (if applicable)
replace with dean stone
e basin
More than four aches of sediment has
Search for the source of the sediment and
accumulated
remedy the problem if possible. Remove
the sediment and dispose of it in a
location where it wil not cause impacts
to streams or the SCM
Erosion of the bash surface has occurred
Provide additional erosion protection such
or riprop is displaced
as reinforced turf matting or riprop if
needed to prevent future erosion problems
Water is standing more than three days
after a storm event
Replace the top few aches of soil to see
if this corrects the standing water problem.
If not, consult an appropriate professional
for a more extensive repair
e embankment
Shrubs or trees are growing on the
Remove trees and shrubs immediately
embankment
An annual inspection by an appropriate
Make needed repairs Immediately
professional shows that the embankment
needs repair
e outlet device
Clogging has occurred
Clean out the outlet device and dispose of
sediment in a location where it will not
cause impacts to streams or the SCM
The outlet device is damaged
Repair or replace the outlet device
e receiving water
Erosion or other signs of damage have
Repair the damage and improve the flow
occurred at the outlet
dissipation structure
Discharges from the infiltration trench are
Contact the local NCDEQ Regional Office
casing erosion or sedimentation in the
receiving water
GR
SO
•k d Iy n ry"i S vt t � � fr � i 'r a t yl 1 Y ty - t 7 . >r m ? i
n v.a Pti ksJ4i J 4 ti Y '� i! t. i
ft ,!
INFILTRATION BASIN TYPICAL SECTION
NTS
AND NOTE:
PERCHED WATER LAYER SHALL BE REMOVED WHEN ENCOUNTERED AND REPLACED WITH THE SAND
THE FILTER MIXTURE ABOVE.
GRASS SOD NOTE:
ASS SOD SHALL BE EITHER HYBRID BERMUDA GRASS OR CENTIPEDE THAT HAS BEEN GROWN IN A
IL THAT IS FREE OF AN IMPERMEABLE LAYER (SUCH AS CLAY).
NOTES:
1. ALL INFILTRATION BASINS SHALL HAVE AN ACCESS EASEMENT CONNECTING TO A DEDICATED PUBLIC RIGHT OF WAY.
2. ALL DRAINAGE AREAS TO AN INFILTRATION BASIN ARE TO BE STABILIZED PRIOR TO INSTALLATION OF SOILS OR GRASS SOD.
3. THE DRAINAGE AREA OF THE INFILTRATION BASIN WILL BE CAREFULLY MANAGED TO REDUCE THE SEDIMENT LOAD TO THE SAND FILTER
SYSTEM.
4, THE WATER LEVEL IN THE MONITORING WELL(S) WILL BE RECORDED ONCE A MONTH AND AFTER EVERY STORM EVENT GREATER THAN 1.5
INCHES
5. IMMEDIATELY AFTER THE INFILTRATION BASIN IS ESTABLISHED, THE VEGETATION WILL BE WATERED TWICE WEEKLY IF NEEDED UNTIL PLANTS
BECOME ESTABLISHED (COMMONLY SIX WEEKS)
6. NO PORTION OF THE INFILTRATION BASIN WILL BE FERTILIZED AFTER THE INITIAL FERTILIZATION THAT IS REQUIRED TO ESTABLISH THE
VEGETATION.
7, THE VEGETATION IN AND AROUND THE BASIN WILL BE MAINTAINED AT A HEIGHT OF APPROXIMATELY SIX INCHES.
BERM
a, u
DRAINAGE
BY OTHERS
�► \ \` \ \ �A� FES --
1 �\ FES
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e
R 1 � I\ �
p - a,
STORM' f TOR' OF EMBAN!&1v1ENT,
' Q AIN� GE� \ E EV=252.0
BY OTH RSI , A � A
I
\ �c OBSERVATION
Io WELL (TYI-)_
AINAGEvI �T `\
EASE ENT
% a, a, a
AL l4 ail
GASS SiPLLWAY
I I R FER " DEif L t
THIS SHET ` ` --� a, a,,--
i��
GRAPHIC SCALE
0 0 20 40 80 160
( IN FEET) PLAN VIEW
1 inch 40 ft.
STORMWATER MANAGEMENT SYSTEM DETAILS
1 NOT TO SCALE
FILTER FABRIC
INFILi
SANE
REMOVABLE CAP
6° SCHEDULE 40 PVC, SOR35, OR SMOOTH WALL CORRUGATED
PLASTIC PIPE WITH 3/le PERFORATIONS 0 6" ON CENTER (4
HOLES PER ROW)
FLUSH WiTH PAVEMENT IN
PERMEABLE PAVEMENT AREAS
i�V d �Y IS tint{� IY Y i 1
;Y„�Y 9`y 4Y�b I�'; 1 Yd'.
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000
RATION
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MEDIA
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�•t.;t�rk 1�,tY���,tntt°-,:�:v!f�
�.�JF,,` vs•�vl&r7+,hdy,
VNUISiURUED S 05LIL
INSERT 4"-6" INTO
IN -SITU SOIL BASE OBSERVATION WELL
SCALE: N.T.S.
STORM DRAINAGE PIPE OR
CONCRETE FLUME
OUTFALL INTO POND LENGTH dt WIDTH
DIMENSIONS 7BE PER
RIP -RAP
APRON DETAIL FILTER BED ELEVATION
ram`
BIO-RETENTION POND
17 l
--- Tr -r TAPER DEPTH
it=t-l{h-i�-�i-i- I 11=III=iI I NTN
FOREBAY,q°9�q�O�Od0�099�tlp
`- 6' CLASS B
RIP -RAP FOREBAY FILiERFABR c
SCALE: N.TS.
LTER MEDIA (SEE NOTE 2)
SILT FENCE AS NEEDED MP
�- 'FLOW -
SOW
NOTES-
1. PRIOR TO INSTALLATION, MANUFACTURER SPECIFICATIONS OF FILTER MEDIA SHALL BE REVIEWED TO
ENSURE THAT DISCHARGE FROM FILTER MEDIA SHALL MEET OR EXCEED THE PROVISIONS OF THE CLEAN
WATER ACT.
2. ENSURE THAT PUMP PRESSURE DOES NOT EXCEED FILTER MEDIA PRESSURE RATING. _
3. FILTER MEDIA MAY BE, BUT NOT LIMITED TO, SAND MEDIA FILTRATION DEVICES, RATED FILTER FABRIC L
BAGS OR POLYMER BASED DEWATERING PRACTICES
4. PUMP STRAINER SHALL NOT BE IN CONTACT WITH BOTTOM OF POND. I
BMP POND DEWATERING
LOW POINT
m
SPILLWAY
FLOW
Q(100)
LONG
SLOPE(%)
H
8
W
SS
CHANNEL LINING
TOP OF EMBANKMENT
ELEVATION
SPILLWAY ELEVATION
INFILTRATION
SPILLWAY
34J0 CFS
3.33�
1.T
10.0'
20.2'
3:1
STRAW WITH NET NAG
SHOREMAX W/ P300
252.0
250.3
w
EXTEND LINING TO EXTEND LINING TO
TOP OF SPILLWAY TOP OF SPILLWAY TOP OF EMBANKMENT=252.0
� H CHANNEL LINING
sS
SPILLWAY ELEVATION=250.3
MATTING SHALL BE AS NOTED
OR APPROVED EQUAL. 13
GRASS SPILLWAY DETAIL GRASS SOD ON SPILLWAY
AND SIDE SLOPES
STAGE/STORAGE TABLE
STAGE (FT)
ELEVATION (FT)
CONTOUR AREA
(SF)
INCREMENTAL
STORAGE (CF)
TOTAL STORAGE
(CF)
0.0
246.0
11195
0
0
1.0
247.0
12725
11960
11960
1.1
247.1
12800
1280
13240 (WQV)
2.0
248.0
14SIO
12236
25476
3.0
249.0
15950
15130
40606
4.0
250.0
17650
16800
57406
5.0
251.0
19405
18528
75933
6.0
252.0
21215
20310
96243
STORMWATER MANAGEMENT DESIGN INFILTRATION SYSTEM #3:
RIVER BASIN: CAPE FEAR
RECEIVING STREAM: LITTLE RIVER (LOWER LITTLE RIVER)
STREAM INDEX: 18-23-(10.7)
STREAM CLASS, WS-III;HQW
HUC: 0303000403
PROJECT COORDINATES: 35.237786N,-79,278200'W
POND DESIGN SUMMARY
9.74 ACRES
DRAINAGE AREA TO POND:
SITE IMPERVIOUS AREA TO POND:
3.40 ACRES
OFF SITE DESIGN IMPERVIOUS AREA TO POND:
0.0 ACRES
TOTAL DESIGN IMPERVIOUS AREA TO POND:
3.40 ACRES
PRE -DEVELOPED
POND
POST -DEVELOPED POST DEVELOPED
TO POND THROUGH POND
TO
DRAINAGE AREA: 9.74 AC
9.74 AC
CURVE NUMBER: 73.5
82.1
TiME OF CONCENTRATION: 18.5 MIN
5 MIN
1.0" STORM EVENT-
0.608 CFS
0,000 CFS
1-YEAR STORM EVENT 9,970 CFS
23.93 CFS
0.000 CFS
2-YEAR STORM EVENT: 14,97 CFS
32.47 CFS
0.000 CFS
10-YEAR STORM EVENT: 30.41 CFS
56.58 CFS
0,000 CFS
100-YEAR STORM EVENT: 57.06 CFS
95.10 CFS
3430 CFS
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INITIAL SUBMISSION
03/14/22
LAYOUT REVISION
11/14/22
NCDEQ COMMENTS
DATE
CEP
DESIGN
DESCRIPTION
CEP CEP
DRAWN CHKD
H• 1" = 40'