SW8070226_APPROVED PLANS_20180710

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO
SW8 (��O Z Zen
DOC TYPE
❑ CURRENT PERMIT
APPROVED PLANS
❑ HISTORICAL FILE
❑ COMPLIANCE EVALUATION INSPECTION
DOC DATE
2 M 0-1 1 O
YYYYMMDD

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HAMPSTEAD
PENDER COUNTY, INC
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APPROVED BY THE FENDER COUNTY UhUIED DEVELOPMENT ADMBNISTRATOR
SIGNATURE OF
APPROVAL DATE:
SITE PLAN VALID FOR (2) TWO YEARS FR(M APPROVAL DATE
50' 0' 50, 100, 150,
SCALE:1" 50'
SURVEY INFORMATION PROVIDED BY:
Talbot Land Surveying, P.C.
170 Lafayette Street
Wilmington, North Carolina 28411 i
Firm License C-2722
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CYPRESS GROVE TWONHOMES
PROJECT INFORMATION SECTION
PROPERTY OWNER
CYPRESS GROVE PARTNERS, LLC
2030 EASIWOOD RD, SUITE 5
W ILMINGTON, NC 28403
(252)916A575
THOMAS 1. RAW!,, MANAGER
APPLICANT
CYPRESS CO", LLC
14931 US HWY 17
HAMPSTEAD, NC 28643
(910)2ri 9576
JIMMY ELUNGTON, REGISTERED AGENT
ENGINEER OF RECORD
MICHAEL C. GALLANT, PE
MICHAEL C. GALLANT, PE, PA
PO BOX JD39
SURF CITY, NC 28445
[phone]
[e-mail]
PROPERTY SURVEYOR
TALBOT LAND SURVEYING, PC
170 LAFAYETTE ST
WILMINGTON, NC 28411
(910)2]0-9824
PROPERTY DATA:
TOTAL TRACT SIZE: 10.0 ACRES. ZONED:PD
LAT. 34.3709 LONG.-77.7117
TOTAL PROJECT AREA TO BE DEVELOPED
10.0 ACRES, ZONED:PD
SETBACKS: PD ZONE/PER PUN
MINIMUM SHOWN: REAR=16', SIDE= 28', FRONT-6
W ETLANDS ON TRAR:I.4ACRE5
AREA TO BE DISTURBED: 8.8 ACRES
U5COE WETLANDS TO BE DISTURBED: O ACRES
PROPERTY PIN: 3282-88-7389-0000
PROPERTYADDRESS:
71 PANSY IN
PROPERTY DESCRIPTION: TR2 PB/46/67
DEED REFERENCE: 3665/255
NAILS CODE; NA (RUIDENTAL(
REQUIRED PERMITS:
ZONING APPROVAL PENDER COUNTY
SEWER EXTENSION - NCDENR
SOIL EROSION AND SEDIMENT CONTROL- NCDENR-DEMUR
HIGH DENSITY STORM WATER PLAN (MOD) - NCDENR-DEMUR
WATER UNE EXTENSION -NCOEQ-PUS
STORM WATER DATA:
RECEIVING STREAM: HARRISON CREEK (CAPE FEAR(
RECENING STREAM INDEX: 18-14-49
STREAM CULSSIFICATION: C-, W
PROPOSED IMPERVIOUS AREAS
BUILDINGS:78,960SF
ROADS: 47
,954 SF
SSIDEWAW:6,82UsF
DRIVEWAYS: 14,000 SF
TOTAL PROPOSED IMPERVIOUS AREAS: 147,7345F
NOTE: EXISTING SW PERMIT SW8 U10226M11) 1111117
THIS PERMIT ALSO ACCOUNTS FOR 3 OHISITE AREAS
PROJECTPHASING
THIS PROJECT IS TO BE BUILT IN ONE PHASE WITH VERTHAL
CONSTRUCITON FOLLOWING A TAKEDOWN SCHEDULE TBD.
START OF CONSTRUCNON; TUNE 2018
PROJECT COMPLETION AND CERTIFICATE OF OCCUPANCY TARGET: DECEMBER 2018
ACCESS
THE SITE IS TO BE ACCESSED DIRECTLY FROM PEANUT RD
PROPOSEDUSE:
THE PROPOSE USE IS FOR 56 TOWNHOMES.
BUFFERS AND LANDSCAPING
15' WIDE TYPE "A" BUFFER FOR ALL ROAD FRONTAGES (SEE DESCRIPTION ON THIS PAGE)
SEE PLAN
10' WIDE TYPE "B" BUFFER FOR ALL OTHER LOT LINES (SEE DESCRIPTION ON THIS PAGE(
SEE PLAN
WATER AND SEWER SERVICE:
THE PROVIDER FOR WATER WILL BE:
. ■
WERDSERVICE
SCOTTSBOX RILL WATER AND SEWER DISTRICT
PO BOX 995
W
605 ST,
BURGAW,NC,28425
GAW, N ,
PH, 910.259.1570
THE PROVIDER FOR SEWER SERVICE WILL BE:
PLURIS HAMPSTEAD, LLC
2095 NC 330
SNEADS FERRY, NC 28406
PH.930.328.62A
CALCUTATIONSSECTION
PARKING:
PARKING REQUIRED PER USE:
RESIDENTIAL PARKING PROVIDED IN DRIVEWAYS
FOR EACH UNIT
TIVESTIMATED TRIPS:
LUC CODE: 492 HEALTH/FITNESS
ESTIMATED DAILY TRIPS: 194
ESTIMATED PM PEAK HOURLY: 21EST
MATED AM PEAK HOURLY S
irt
LCUICODE. 820 SHOPPING CENTER
ESTIMATEDOAILYTRIP455
ESTIMATED PM PEAK HOURM 6
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ESTIMATED AM PEAK HOURLY: 3
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TOTAL DAILY TRIPS: 249
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TM NITS PROPOSED
R OSED 356
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DENSITS 5.6 UN1ED
DENSNV=S6UNIT5/ACRE'
OPEN SPACE
.03 ACRS/ UNIT 256 UNITS=1.68 ACRES REM
1.27 ACRES PROVIDED
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170 Lafayette Street
Wilmington, North Carolina 28411
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SCALE: 1" = 50'
SURVEY INFORMATION PROVIDED BY:
Talbot Land Surveying, P.C.
170 Lafayette Street j
Wilmington, North Carolina 28411
Firm License C-2722 i
Phone: [phone]
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SURVEY INFORMATION PROVIDED BY:
Talbot Land Surveying, P.C.
170 Lafayette Street
Wilmington, North Carolina 28411 i
Firm License C-2722
Phone: [phone]
COLLECTION SYSTEM CALCULATIONS
LINK ID
UPSTREAM
NODE
DOWNSTREAM
NODE
LENGTH
SLOPE
DIAMETER
VELOCITY
DEPTH
Q
Q max
(FT)
(FT/FT)
(IN)
(FPS)
(FT)
(CFS)
(CFS)
1
CI
02
28.87
0.06
24.00
2.00
0.94
2.89
6.61
2
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CI
82.50
0.70
24.00
5.53
0.70
5.42
22.13
3
CI 3
C14
36.29
0.07
18.00
1.60
0.57
0.99
3.27
4
CI 4
CI 5
49.27
0.05
1 18.00
1.46
1 1.06
1.94
2.74
5
CI 5
CI 6
29.02
0.05
21.00
1.90
1.23
3.44
4.13
13
CI
C16
.2.42
0.20
24.00
3.63
1.14
6.74
11.77
14
CI
C19
123.94
0.05
36.00
2.45
1.94
1 11.83
17.38
15
CI 9
CI 10
142.02
0.05
36.00
2.41
2.46
14.97
17.38
16
CI 10
CI 13
175.77
0.05
42.00
2.64
2.46
19.10
26.22
17
CI 13
OUT 1
114.22
0.17
42.00
4.69
1.80
23.31
47.72
18
CI
CI
28.90
4.42
18.00
7.01
0.23
1.17
25.72
19
CI 11
CI10
28.90
8.38
18.00
10.35
0.25
2.04
35.43
20
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C115
29.05
0.05
18.00
1.34
0.70
1.09
2.74
21
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CI 13
145.79
1.76
18.00
6.08
0.39
2.18
1 16.23
22
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CI 13
1 28.89
8.77 1
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8.51 1
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COMPLETION OF WORK OR DEVELOPMENT.
PERMANENT GROUND COVER SHALL BE ESTABLISHED WITHIN 15
WORKING DAYS OR 90 CA LENDER DAYS
(WHICHEVER IS SHORTER) FOLLOWING THE COMPLETION OF
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LEGEN IJ SYM.
BEARING AND DISTANCE
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PROPERTY BOUNDARY/
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EXISTING CONTOUR
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SURVEY INFORMATION PROVIDED BY:
Talbot Land Surveying, P.C.
170 Lafayette Street
Wilmington, North Carolina 28411
Firm License C-2722
Phone: [phone]
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APPROXIMATE SCALE: 1" = 80' Q
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Gate Valve
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50' 0' 50' 100' 150'
SCALE: 1" = 50'
SURVEY INFORMATION PROVIDED BY:
Talbot Land Surveying, P.C.
170 Lafayette Street 08
Wilmington, North Carolina 28411 -
Firm License C-2722
Phone: [phone]
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Temporary Gravel
Construction Entrance/Exit
nts
Construction Specification,
vegetation, 1. Clear the entrance and exit area of all g etation , roots and other
objectionable material and properly grade it,
2. Place the gravel to the specific dimensions shown on the detail, and
smooth it.
3. Provide drainage to carry water to a sediment trap or other suitable
outlet.
4. Use geotextile fabrics because they improve stability of the foundation
in locations subject to seepage or high water table.
Maintenance Note,
1. Maintain the gravel pad in a condition to prevent mud or sediment from
Leaving the construction site. This may require periodic topelressing with 2-
inch stone. After each rainfall, inspect any structure used to trap sediment
and clean It out as necessary. Immediately remove all objectionable materials
spilled, washed, or tracked onto public roadways.
EROSION CONTROL CALCULATIONS
TIME OF CONCENTRATION AND RAINFALL INTENSITY 10 YR STORM
RAINFALL
INTENSITY Tc min Tc min Tc min
TIME min irJhr PRE DURING POST
5
9.54
184.45
18.53
18.53
10
7.63
203.66
20.46
20.46
15
6.44
2%57
22.06
22.06
30
4.66
253.45
25.47
25.47
60
3.04
306.32
30.78
30.78
120
1.92
375.58
37.74
37.74
180
1.39
433.44
43.55
43.55
360
0.862
535.76
53.83
53.83
720
0.509
676.78
68.00
68.00
PRECONSTRUCTION INTENSITY
0.509 Whir
DURINGCONSTRUCTION INTENSITY
4.66 in/hr
POST CONSTRUCTION INTENSITY
4.66 in/hr
DRAINAGE AREA 10 ACRES
irVhr
C PRECON 0.23
C DURING 0.75
C POSTCON 0.72
Q10 PRECONI
1.17
CFS
Q10 DURINGI
3A85
I CFS
Q10POST CON
33.37
CFS
SEDIMENT STORAGE AND BASIN MINIMUM
W Ai F Tn Fr1R v R;Mnu nFx:_CITF aRFaR
UPON STABILIZATION OF ALL UPSTREAM AREAS ALL SEDIMENT SHALL BE
REMOVED FORM THE WET DETENTION BASIN PRIOR TO BEING PUT INTO SERVICE
AS A STORMWATER BMP.
NOTE SLOPE ALL FILLED AREAS ® 3: 1 & STABILIZE
WITH EXCELSIOUR MAT.
NOTE: SEE SEEDING CHART FOR DETAILS IN STABILIZING DISTURBED AREAS.
STABILIZE ALL DISTURBED AREA WITHIN 7 DAYS MAXIMUM.
ALTERNATIVE $1
SEED 6 FERTILIZE ACCORDING TO SEED
CHART.
SPRAY PAN @ 20LBS PER ACRE. MULCH
WITH STRAW @ 2 TONS PER ACRE.
ALTERNATIVE 12
HYDROSEED
-SEED WITH PENNINGTON OUTER BANKS
MIX.
-PENNINGTON JET SPRAY
-20/20/20 FERTILIZER AND PENN TAC 5
OR FOR MECHANICALLY AGITATED
MACHINES
-7D/30 BLEND BY PROFILE
-16/24/12 FERTILIZER
-PENN TAC 5
CALCULATION NOTES
The rational method was used to
calculate the runoff flows. Temporary
sediment trap volumes and dimensions
were calculated using methods found in
6.60 of the "Erosion and Sediment
Planning and Design Manual". Energy
dissipaters were sized using Section 8.06
from the "Erosion and Sediment Control
Planning and Design Manual".
V
TYT
-------------------
_ _________ _
p _ Az
%Doerr.
PRE DURING POST PRE DURING POST
ALPHA 0.490812 5.889742 5.889742 H 5 5 5 FT
SLOPE 0.00625 0,00625 0.00625 FT/FT
L 800 800 800 FT/FT
On 1.667 CONSTANT FOR TURBULENT FLOW
n 0.24 0.02 0.02
C 0.23 0.98 0.98 (C VALUES FOR DURING
PRE DURING POST AND POST REPRESENT PAVED
SURFACE CONDITIONS ALONG THE FLOW PATH)
THE CALCULATIONS ABOVE ARE BASED ON THE EQUATION BELOW FOR TIME OF CONCENTRATION
Te(MIN CITIES) TL=(LI(ALPHAx(IxC/43,200)A2/3))A2/3)/ 60
THIS FORMULA IS EVALUATED FOR PRE, DURING, AND POST CONSTRUCTION
CONDITIONS. THE VALUES FOR Tc ARE TABULATED IN THE UPPER LEFT HAND TABLE.
THE VALUES IN BOLD REPRESENT THE TIME OF CONCENTRATION
COMPOSITE C CALCULATIONS(DURING CONSTR.)
C AREA PRODUCT
IMPERV. ACRES 0.98 6.82 6.6836
GRASSED/DIRT 0.25 3.18 0.795
TOTAL 7.4786 THE CALCULATIONS FOR RATIONAL C FOR THE ENTIRE AREA
C(DURING)= 0.7 (NOT JUST THE FLOW PATH) ARE TO THE IMMEDIATE LEFT.
THESE VALUES ARE USED TO CALCULATE THE PEAK FLOW USING
COMPOSITE C CALCULATIONSIPOST CONSTR.) THE EQUATION Q= IeC-A
C AREA PRODUCT
IMPERV. ACRES 0.98 6.82 6.6836I
GRASSED AREAS 0.15 3.18 0.477
TOTAL 7.1606
rjanrn=r---n i9
SKIMMER DRAWDOWN
ORIFACE
SIZE, IN
3
Cd
0.6
VOLUME, CU FT
12276
ORIFACE AREA, SF
0.049063
AVE HAED, FT
0.333
Q, CFS
0.136322
DRAW. TIME, DAYS
1.042263
INTENSIT START DEPTH
DITCH ID AREA Y C Q10 L INV END INV SLOPE VALLOW VACTUAL EST. n R AREA D ACTUAL
acres inhlr cfs ft 8 R It/ft fps fps ft B sf It
SWALE 1
4.52
1 9.54
1 0.78
33.63
75
43.1
42.0
0.015
4.5
4.31
1.61
0.035
0.763687
7.806847
1.61
AN INTENSITY OF 9.541N/HR WAS USED TO CALCULATE THE ABOVE SWALE INFORMATION.
A THIS REPRESENTS ATIME OF CONCENTRATION OF 5 MINUTES AND IS CONSERVATIVE.
THIS SWALE RECIEVES FLOW FROM AN EXISTING STORM DRAIN FROM 3 OFFSITE AREAS
THESE AREAS HAVE AREA TOTAL OF 4.52 ACRES WITH AMAMMIUM BUA OF 3.55 ACRES.
THE SWAL WILL BE LINED WITH RIP RAP
7
6
Steel Filter
post fabric
ndkco trench
and compact
thoroughly Natural
ground
/ground
....•inh.L..::•1' min'
Sediment Fence
Detait
Cross Section View
nts
invent fence maintenance notes,
Inspect sediment fences at least once a week and after
In rainfall. Make any required repairs immediately.
Should the fabric of the sediment fence collapse, tear,
ompose or become ineffective, replace it promptly,
Remove sediment deposits as necessary to provide adequate
rage volume for the next rain and to reduce pressure on
fence. Take care to avoid undermining the fence during
Inout.
Remove all fencing materials and unstable sediment deposits
bring the area to grade and stabilize it after the contri-
ing drainage area has been property stabilized.
Crass -section of porous baffle
in a sediment basin
nts
Dine oowI D-
L Gvee M. M o m I be YONon ro 4M front to Cntl, uY sb to "c
z LwteK ro.0 ). n..r. e<rw. sr .Mur or u. eedwnt age �rnre
a. st,Q d swna a wwd m o d e If ee•. L¢e n Drown or r
apo., uM. nw, uV V,e xv rf of. w u Mir TM a-P N <Ye r,Eet
I 4.Iw r e npwr anon a. Bern. w <r eywnr. ow Of mrnes eroee m
4. m.ee sty, <r t1 or mx r.,.
I.wmu It wwt trx.e row of mvnw note., am wet .w .,wc a.ewry,
I..<...m n .waw< .re or rM,e oPnH tm too, o< tr ..e..n
6 wY`rw ,_ ., w,e 8,m e.eue M mr m., n.e.. me1wse yr
vs III da Hu,rrw reear Inb tiv w.lvo eery ry erafiwYq a,I fow r
Hr.4a r e rrw m ten wre.n< ew.w.ry e, the we.e. mr . ,n,e
.fd . w�< od, a.e, wr., •<•w••
T. Tr mcwr ww ode . we i.rw stye r ..e_r+a n o ae,.n or en.we
wtn s-he, e..H.r I.,aw ,.cue •uv,w
a r rot .eYke IN Fatrk. Iwt us n cm<Faoiu Mece news dx buffit
rfne wn<er_nw ante,.
1 4¢wect burns nt kvst mce a _m nrtl niter wN roMaLL Me. off rtpbee
z. spal"e o<�se.awr,mw ..as: m uw minty. snore ........ ine eawwe.
te.r, eer.Pe.e. a eerorw n.irec<Iw...po=e n r.Pur.
s r._.e xd,e,< rPOMse Hxn n rent%Rv w m ,.and .erw_t.
e. n.a. inr are rwx< ran om m tl. mina mr
o.ae ee.nl minty wwM nwnws smMenc drar m..w
mP,ra •sPnx eePax
e nr<r `me ..nrwuro dne.v men ,o ran war w 1. grow.
ae
rinnw.a_ . ww ..<.M. e.ewnt eewme, ewe sr arty so yam. om
NOTE: NOTE STABILIZE ALL DISTURBED AREAS WITHIN 7 DAYS OF
COMPLETION OF WORK OR DEVELOPMENT.
PERMANENT GROUND COVER SHALL BE ESTABLISHED WITHIN 15
WORKING DAYS OR 90 CA LENDER DAYS
(WHICHEVER IS SHORTER) FOLLOWING THE COMPLETION OF
CONSTRUCTION OR DEVELOPMENT.
5I_11aaJA1.CN��ALT
1. ALL EROSION AND SEDIMENT CONTROL PRACTICES WILL BE CHECKED FOR STABILITY
AND OPERATION FOLLOWING EVERY RUNOFF -PRODUCING RAINFALL, BUT IN NO CASE,
LESS THAN ONCE EVERY WEEK. ANY NEEDED REPAIRS WILL BE MADE IMMEDIATELY TO
MAINTAIN ALL PRACTICES AS DESIGNED.
2. ALL CONSTRUCTION ENTRANCES WILL BE PERIODICALLY TOP -DRESSED WITH AN
ADDITIONAL 2 INCHES OF #4 STONE TO MAINTAIN PROPER DEPTH. ANY SEDIMENT THAT
IS TRACKED INTO THE STREET WILL BE IMMEDIATELY REMOVED.
3. DURING THE ESTABLISHMENT PERIOD, CHECK GRASS -LINED CHANNELS AFTER EVERY
RAINFALL. AFTER GRASS IS ESTABLISHED, PERIODICALLY CHECK THE CHANNEL: CHECK IT
AFTER EVERY HEAVY RAINFALL EVENT. IMMEADIATELY MAKE REPAIRS. IT IS PARTICULARLY
IMPORTANT TO CHECK THE CHANNEL OUTLET AND ALL ROAD CROSSININGS FOR BANK
STABILITY AND EVIDENCE OF PIPING OR SCOUR HOLES. REMOVE ALL SIGNIFICANT SEDI-
MENT ACCUMULATIONS TO MAINTAIN THE DESIGNED CARRYING CAPACITY. KEEP THE
GRASS IN A HEALTHY, VIGOROUS CONDITION AT ALL TIMES, SINCE IT IS THE PRIMARY
EROSION PROTECTION FOR THE CHANNEL.
4. SEDIMENT WILL BE REMOVED FROM BEHIND THE SEDIMENT FENCE WHEN IT BECOMES
.5 FEET DEEP AT THE FENCE. THE SEDIMENT FENCE WILL BE REPAIRED AS NECESSARY
TO MAINTAIN A BARRIER. SILT FENCE STAKES WILL BE SPACED 6 FEET APART UNLESS
A WIRE BACKING IS USED WITH 8 FOOT STAKE SPACING.
5. ALL SEEDED AREAS WILL BE FERTILIZED, RESEEDED AS NECESSARY, AND MULCHED
ACCORDING TO THE SPECIFICATIONS IN THE VEGETATIVE PLAN TO MAINTAIN A
VIGOROUS, DENSE VEGETATIVE COVER.
STABILIZATION NOTES
ALL DISTURBED AREAS WILL BE STABILIZED WITHIN 7 DAYS OF CEASE OF ANY PHASE
OF ACTIVITY. THIS INCLUDES SLOPES, SWALES, STOCKPILES AND ANY OTHER
UNSTABILIZED AREAS.
ENERGY DISSAPATOR DETAIL
WET POND OUTLET
NOT TO SCALE
a
PLAN VIEW
NOTES:
ALL SIDE SLOPES TO BE 2: 1
MINIMUM. 6- RIP RAP, 18- THICK
WITH 3" OF ABC STONE
UNDERLAYMENT. DETAIL APLIES FOR
WING WAL INLETS AND OUTLETS AND
ENERGY DISSIPATOR AT WET POND
OUTLET. APRON WIDTH AND LENGTH
DESIGNED USING FIG 806.B.1-3 IN
MANUAL (PAGE 8.06.4. WHERE
DISSIPA TOR IS IN OR PART OF A
CHANNEL THE WIDTH IS TO EXTEND
TO THE TOP OF THE CHANNEL.
5
A
B' max. standard strenoth fabric with wire Fence
nts
TEMPORARY SOIL STOCKPILE NOTES
1, TEMPOARY SOIL STOCKPILES SHOWN ON PLAN ARE SUGGESTED LOACTIONS
ONLY. STOCKPILES CAN BE LOCATED IN AREAS CONVENIENT TO THE
CONSTRUCTUION PROCESS. 2. STOCKPILES ARE NOT TO BE LOCATED ON SEVERE
SLOPES OR IN AREAS THAT RECIEVE FLOW FROM UPHILL RUNOFF. 3. ALL
STOCKPILES ARE TO BE SLOPED AT NO MORE THAN 21 AND STABILIZED AS SOON
AS POSSIBLE USING HYDROSEEDING. 4. STOCKPILES ARE TO BE SURROUNDED BY
SEDIMENT FENCE TO PREVENT EROSION. IN THE EVENT THAT SIDE SLOPES
ERODE OR FAIL AND THE SEDIMENT FENCE IS BREACHED OR SEDIMENT
ACCUUMULA71ON IS SIGNIFICANT THE STOCKPILE SHOULD BE REGRADED AND
RESTABILIZED AND THE SEDIMENT FENCE REPAIRED.
CYPRESS GROVE
SOIL EROSION AND SEDIMENTATION CONTROL PLAN
Construction Schedule
1. Pre construction meeting with surveyor, grading contractor, owners and Engineer.
A meeting will take place involving all parties involved in the construction process.
The soil erosion and storm water plans will be discussed, as well as the sequence
and BMP?s to be in place before, during and after construction.
2. Temporary Gravel Construction Entrance/Exit-Practice 6.06
A temporary gravel construction entrance/exit will be installed at the entrance to
the site.
3. Sediment Fence - Practice 6.62
A sediment fence will be erected around the project boundaries as shown on the
plan. This fence Will stay in place until the tract is stabilized with suitable ground
cover and all grading is complete.
4. Skimmer Sediment Basin - Practice 6.64
A skimmer sediment basin will be constructed as shown on the plan.
5. Inlet Stabilization Structure - Practice 6.41
Intlet stabilization is to be constructed as shown on the plan
6. Land Grading - Practice 6.02
Filling of the lot will begin and allow the final grades to be set.
7. Construction of Buildings
Construction of buildings will proceed to the point where heavy equipment will no
longer be needed.
8. Utility Installation
Underground utilities are to be installed and swales and other BMP?s are to be
repaired as soon as possible. Reseeding of areas disturbed b utilitywork is to
P P 9
take elope no later than days after installation is complete. Note that
the Temporary ion Ditches can be removed once the stormwater collection
system has beenn installed.
9. Paving
10. Surface Stabilization
All disturbed surfaces that are not paved are to be stabilized accorded to the
vegetative plan.
11. Sediment removol from stormwater bmp
After all areas have been stabilized the sediment shall be removed from the
Basin prior to its being put into service as a stone water BMP.
?.(t"4r.4;r4t'fFtF(FN .
a,
SECTION A -A
Site Q
VICINITY MAP
NOT TO SCALE
Legend:
co,
Power Pale
Monitoring Well
0
Fire Hydrant
pQ
Gate Valve
yN
pQ
Water Valve
®
Water Meter
Fiber Optic Warning Post
'.TRIP THE AREA UNDER THE EMBANKMENT OF ALL VEGETATION AND ROOT MAT. REMOVE ALL SURFACE SOIL CONTAINING
ANIC MATTER,AND STOCKPILE OR DISPOSE OF IT PROPERLY, HAUL ALL OBJECTIONAL MATERIAL TO THE DESIGNATED
MATERIAL FOR THE EMBANKMENT IS FREE OF ROOTS, WOODY VEGETATION, ORGANIC MATTER, AND OTHER OBJECTIONAL
FILL IN LIFTS NOT TO EXCEED 9 INCHES, AND MACHINE COMPACT IT. OVER FILL THE EMBANKMENT 6 INCHES TO ALLOW
DUET SECTION OF THE EMBANKMENT. PROTECT THE CONNECTION BETWEEN THE RIPRAP AND THE SOIL FROM PIPING BY
- YLAIL HILL YILILK eA)MIU BLNWLLN IHL KIYKPY AND NHL ]LIL. tXILNU Mt YABKIC
ACROSS THE SPILLWAY FOUNDATION AND SIDES TO THE TOP OF THE DAMN OR
- EXCAVATE A KEYWAY TRENCH ALONG THE CENTER LINE OF THE SPILLWAY FOUNDATION
EXTENDING UP THE SIDES TO THE HEIGHT OF THE DAM, THE TRENCH SHOULD BE AT
LEAST 2 FEET DEEP AND 2 FEET VIDE WITH 1.1 SIDE SLOPES,
4. CLEAR THE POND AREA BELOW THE ELEVATION OF THE CREST LK THE SPILLWAY TO FACILITATE SEDIMENT CLEANOUT.
5. ALL CUT AND FILL SLOPES SHOULD BE 2.1 OR FLATTER.
6. ENSURE THAT THE STONE (DRAINAGE) SECTION OF THE EMBANKMENT HAS A MINIMUM BOTTUM WIDTH OF 3 FEET AND MAXIMUM SIDE SLOPES
OF 1-1 THAT EXTEND TO THE BOTTOM OF THE SPILLWAY SECTION.
7. CONSTRUCT THE MINIMUM FINISHED STONE SPILLWAY BOTTOM WIDTH, AS SHOWNON THE PLANS, WITH 2.1 SIDE SLOPES EXTENDING TO THE
TOP OF THE OVER FILLE➢ EMBANKMENT. KEEP THE THICKNESS OF THE SIDES OF THE SPILLWAY OUTLET STRUCTURE AT A MINIMUM OF 21
INCHES. THE WEIR MUST BE LEVEL AND CONSTRUCTED TO GRADE TO ASSURE DESIGN CAPACITY,
8. MATERIAL USED IN THE STONE SECTION SHOULD BE A WELL -GRADED MIXTURE OF STONE WITH A D50 SIZE OF 9 INCHES (CLASS B EROSION
CONTROL STONE IS RECOMMENDED) AND A MAXIMUM STONE SIZE OF 14 INCHES. TEH STONE MAY BE MACHINE PLACED AND THE SMALLER STONES
WORKED INTO THE VOIDS OF THE LARGER STONES. THE STONE SHOULD BE HARD, ANGULAR, AND HIGHLY -WEATHER RESISTANT.
9. DISCHARGE INLET WATER INTO THE BASIN IN A MANNER TO PREVENT EROSION. USE TEMPORARY SLOPE DRAINS OR DIVERSIONS WITH OUTLET
PROTECTION TO DIVERT SEDIMENT -LADEN WATER TO THE UPPER END OF THE POOL AREA TO IMPROVE BASIN TRAP EFFICIENCY.
]a ENSURE THAT THE STONE SPILLWAY OUTLET SECTION EXTENDS DOWNSTREAM PAST THEME OF THE EMBANKMENT UNTIL STABLE CONDITIONS
ARE REACHED AND OUTLET VELOCITY IS ACCEPTABLE FOR THE RECEIVING STREAM. KEEP THE EDGES OF THE STONE OUTLET SECTION FLUSH
WITH THE SURROUNDING GROUND, AND SHAPE THE CENTER TO CONFINE THE OUTFLOW STREAM.
ll. DIRECT EMERGENGY BYPASS TO NATURAL, STABLE AREAS. LOCATE BYPASS OUTLETS SO THAT FLOW WILL NOT DAMAGE THE EMBANKMENT.
12. STABILIZE THE EMBANKMENT AND ALL DISTURBED AREAS ABOVE THE SEDIMENT POOL AND DOWNSTREAM FROM THE TRAP IMMEADIATELY
AFTER CONSTRUCTIGN.
13. SHOW THE DISTANCE FROM THE TOP DO THE SPILLWAY TO THE SE➢IMENT CLEANUUT LEVEL (1/2 THE DESIGN DEPTH) ON THE PLANS AND
MARKED IN THE FIELD,
14. 1NSTALL POROUS BAFFLES AS SPECIFIED ON THE PLAN.
MAINTENANCE -
I. INSPECT SKIMMER BASIN AT LEAST WEEKLY AND AFTER EACH SIGNIFICANT (1/2 INCH OR GREATER) RAINFALL EVENT AND
REPAIR IMMEADIATELY. REMOVE SEDIMENT. AND RESTORE THE TRAP TO ITS ORIGINAL DIMENSIONS WHEN THE SEDIMENT HAS ACCUMULATED TO
ONE-HALF THE DESIGN DEPTH OF THE TRAP. PLACE THE SEDIMENT THAT 1S REMOVED IN THE DESIGNATED DISPOSAL AREA AN R
PART C THE GRAVEL FACING THAT IS IMPAIRED BY SEDIMENT. D REPLACE THE
2. IMECK THE STRUCTURE FOR DAMAGE FROM OFEROSIONTHE OR PIPING, PERIODICALLY CHECK THE DEPTH OF THE SPILLWAY NK ENSURE S IS A
MINIMUM OF 1.5 FEET BELOW THE LOW I POINT OF THE EMBANKMENT. IMUST BE ELY FILL ANY SETTLEMENT OF THE EMBANKMENT TO SLIGHLY
ABOVE DESIGN GRADE. ANY RIPRAP DISPLACED FROM THE SPILLWAY MUST IL REPLACED E THEN STRUCTURE
3. AFTER ALL SEDIMENT-PRODUCINGTOBLEND
AREAS HAVE BEEN PERMANENTLY STABILIZED, REMOVE THE STRUCTURE AN➢ ALL UNSTABLE SEGMENT,
SMOOTH THE AREA TO BLEN➢ WITH THE ADJOINING AREAS. AND STABILIZE PROPERLY,
3
SURVEY INFORMATION PROVIDED BY:
Talbot Land Surveying, P.C.
170 Lafayette Street
Wilmington, North Carolina 28411
Fl. License C-2722 i
Phone: [phone]
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SEE DETAIL ON C5.2
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�12" N12 WT HDPE BARREL 7
3 „� ,lZol✓ S
................................ EMERGENCY SPILLWAY_
OUTLET STRUCTURE RISER WITH 6" OF 6" RIP RAP AND
AI
OVER 6" OF ABC STONE AND FIL`T•Ej2 FABRIC
�W/ TRASH RACK SPILLWAY LIP TO BEAT EL. = 45.50 ♦••♦•
•♦ • 86
6' VEGTATED SHELF •♦••♦•
AROUND MAIN POND PERIMETER
FLAT AT EL. = 41.0
SKIMMER BAST
I `BAFFLES
I
366'
M1 IN POND Ll
fill ''� GE EASEMEMI•��
/ 1 711i, / l �/ l 7� � �na,• ,� ,m. .m• r� � . �
TRASH RACK ON
RISER ELE = 42.76
�0
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- .................................................
,80'68Z 3 �S, LZ° S 4- - - - - -
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6Z ,r TO FOREIRIV MIN 6" RIP RAP i
••♦''�. �� S �J ORE Y cO INLET FES F i� 1
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B �APPROX. LF OF 12"
N12 WT HDPE LAID FLAT AT
42.0
SEE FILTER DIAPHRAM DETAIL
ON THIS SHEET
RISER ELE = 42.
CONTROL PIPE
INVERT OUT
ELE 42.0
INV IN = 41.0 \
E
SKIMMER
FOR USE DURING
CONTRUCTION
G
OUTLET STRUCTURE DETAIL
NOT TO SCALE
PRMANENT POOL ELE = 42.00
TEMP POOL ELE = 42.76
NOTE:
A. 4 X 4 CONCRETE PRECAST RISER WITH FRAME CAST INTO LID
AND 3 X 3 GRATE BED ON MIN 6' ABC STONE TIP. 3'
CONTROL PIPE INSTALLED AT AN ACLE WTH THE WHET
AT 42.00 INSIDE ME BOX AND THE INLET AT 41.0 OUTSIDE THE
BOX AND INTO THE MAIN POOL
B. SINGLE BARRn 12' HOPE WTFAL INVERT 4200, WTLET
INV. 4200.
D. ENERGY DISSAPATOR ED SEE DETAIL ON SHEET C52.
E. 4' EMERGENCY DRAIN AT INV 42.00 W/ GATE VALVE.
F. FILILT3 DIAPHRAµ SEE DETAIL ON THIS SHEET.
G 6' ABC STOVE UNDER BOX
g I 7
NOTE: VEGETATED SHELF TO BE PLANTED WITH
A MINIMUM OF 50 PLANTS PER 200 SQUARE FOOT AREA
OF WETLANDS VEGETATION CONSISTING
OF THE FOLLOWING SPECIES:
asclepias incal swampmiklweed
caerx tenera quill sedge
chelone glabra white tutrlehead
THESE PLANTS ARE SPECIFIED IN THE NC STORMWATER
DESIGN MANUAL SECTION C3 "WET POND"
CONTRACTOR SHOULD CONSULT WITH A WETLAND PLANT SPECIALIST
TO ENSURE THAT ALL SPECIES PLANTED CAN REMAIN INUDATED
AS THE SHELF SHOULD REMAIN BELOW THE PERMANENT POOL.
WET POND SECTION
NTS
DE SLOPE
IW PP TYP.
NOTES FOR THE CONDUIT CONNECTING THE FOREBAY AND MAIN POOL SWAL NTS DETAIL
1. THE CONDUIT IS (2) 36" HDPE SMOOTH WALL PIPES. NOTE: D SHALL BE 2' AND THE WIDTH, W SHALL BE 12'.
2. THESE PIPES WERE SIZED TO BE ABLE TO PASS THE INFLUENT
FLOW FROM THE 50 YEAR EVENT.
3. THE? YEAR EVENT EXCEEDS THE NCDEQ DESIGN STORM AT A STAGE OF 43.76 FEET
AND A PEAK INFLOW OF 6.82 CFS.
4. ASSUMING THE PIPES ARE HALF FULL AT THE 2 YEAR PEAK STAGE (ACTUALLY 43.5 FEET)
THE AFEA OF FLOW WOULD BE Pi * 3 / 4 / 2 = 3.53 SF FOR EACH PIPE FOR A TOTAL OF 7.1 SF.
5. DIVIEING THE PEAK FLOW BY THIS AVAILABLE AREA YIELDS AN AVERAGE VELOCITY OF 0.945 FPS.
FILTER DIAPHRAGM
NTS
TOP OF DIAPHRAM/
Al RIP RAP
3' MINIMUM OR
END TO THE EDGE OF
EXCAVATION.
COMPACT ASTM C33
FINE CONCRETE AGGREGATE
E
INVERT = 32.5
N
FILTER DIAPHRAM NOTE:
1. MEDIA TO BE COMPACTED ASTM C33 FINE CONCRETE AGGREGATE
2. FILTER SHOULD EXTEND 2' BELOW PIPE AND TO THE BASE OF THE
RIP RAP SPILLWAY ABOVE THE PIPE.
3. FILTER SHALL BE A MINIMUM OF T WIDE ALONG THE PIPE AND
A MINIMUM OF 3' ON EACH SIDE OF THE PIPE PERPANDICULAR TO THE PIPE
OR AS WIDE AS THE EXCAVATION.
UPON STABILIZATION OF ALL UPSTREAM AREAS ALL SEDIMENT SHALL BE
REMOVED FORM THE WET DETENTION BASIN PRIOR TO BEING PUT INTO SERVICE
AS A STORMWATER BMP.
NOTE:
DO NOT PLANT TREES WITHIN 10 FEET OF INLET OR OUTLET PIPES,
SPILLWAYS OR FLOW SPREADERS. TREE SPECIES WITH WATER SEEKING
ROOTS SUCH AS WEEPING WILLOWS AND POPLARS SHOULD BE AVOIDED
WITHIN 50 FEET OF PIPES OR MANMADE STRUCTURES. EVERGREEN TREES
WHICH PROVIDE VERY LITTLE LEAF FALL ARE PREFERRED IN AREAS
DRAINING TO DETENTION DEVICES. TREES SHOULD BE SET BACK SO THAT
BRANCHES DO NOT EXTEND OVER THE PERMANENT POOL.
NOTE:
DURING CONSTRUCTION THE BMP IS TO BE USED AS A SKIMMER SEDIMENT BASIN.
AT THIS TIME THE INFILTRATION MEDIA SHOULD NOT BE PLACED IN THE BASIN.
UPON STABILIZATION OF ALL AREAS DRAINING TO THE BASIN THE TNFILTR ATTON MEDIA CAN BE INSTALLED.
FUTURE DEVELOPMENT WILL REQUIRE THAT ALL EROSION CONTROL MEASURES BE INDEPENDENT
OF THE FUNCTIONING BMP TO PREVENT SEDIMENT LADEN RUNOFF FROM CLOGGING THE
INFILTRATION MEDIA.
3
1.
BE DIRECTED TO THE TEMPORARY
- SUMP AND INLET PROTECTION.
L_BE COLLECTED AND DIRECTED TO
ALL
■ 0■0 111
1 •
SECTIONS.
T AND HAVE
0
SURVEY INFORMATION PROVIDED BY:
Talbot Land Surveying, P.C.
170 Lafayette Street
Wilmington, North Carolina 28411
Firm III, a C-2722
Phone [phone]
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_SS S —A --- --- ON
TOPSAIL TOWNSHIP, PENDER COUNTY, NORTH CAROLINA
STORM WATER, WATER SYSTEM,
GRADING, SEDIMENTATION & EROSION
CONTROL PLANS
INDEX:
CVR - COVER SHEET
0 SWM1 - OVERALL SITE PLAN & SHEET INDEX
o SWM2 - SITE & GRADING PLAN
SWM3 - STORMWATER PLAN/PROFILE
SWM4 - STORMWATER & WATERLINE PLAN/PROFILE
o I SWM5 _ STORMWATER POND "B" DETAIL PLAN
SWM6 DETAILS
G��PG SWM7 _ DETAILS
SWM8 SEDIMENTATION & EROSION CONTROL PLAN
SWM9 - SEDIMENTATION & EROSION CONTROL DETAILS
�0 �Q� � SWM10 - EXISTING SITE CONDITIONS
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CIVIL ENGINEER S1 TEO uJ Z - 8Y $GAu4*T
ay ajoupArl-
JAMES W. HOLLAND, P.E.
CONSULTING ENGINEER'.i".
P.O. BOX 2928
SURF CITY, N.C. 28445 ......�. _ a APPROVED
PH: (910) 803-0 FAX: [phone]H5
SURVEYOR
THE CLARK GROUP �1v
P.O. BOX 10136
WILMINGTON, NC 28404 �Q \v
PH: [phone]
FAX: [phone] O �( \\�� CAR 04�i���
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L-4556
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ARK c znvUP CALL 1-800-632 4949
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'�i�� F�R+,iNE��' ' ' N.C. ONE —CALL CENTER
W. fit 25 to urveying � vision %,
ITS THE LAW
PO eox 10136, w�LuInGrc 1, NC 28404 c o
PH. 910.602.3900 - FAX )10.602.3975 zv .
VICINITY MAP JClN 2
c-141s NOT TO SCALE`jY_— SHEET CVR

80' 0'
Scale: 1'=80'
80' 160, 240'
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LEGEND
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DOS7ING IRON ROD
(E/P)
EXIS77NG IRON PIPE
(EIPT)
EXISTING IRON PINCHED TOP
(SIP)
SET IRON PIPE
(EMN)
EXISTING MAG NAIL
—52—
DUSTING CON70UR LINE W/ELEV.
R/W
RIGHT OF WAY
— —
LINE NOT SURVEYED
BENCHMARK
a
POWER POLE
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OSG
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BLACK JACK OAK
GTO
TURKEY OAK
HICKORY TREE
CHERRY TREE
®
PECAN TREE
J
TREE LINE
®
WATER METER
®
CATCH BASIN
REVISIONS:
2. REVISED 8/11/10 PER COMMENTS
FROM DWQ July 27, 2010.
1. REVISED JULY 8, 2010-ADDED
WETLANDS & SHWT BORE LOCATION
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Aif:U/ No.:
99608-007
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