SW8080944_APPROVED PLANS_20081124

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW8 0(60(H`4
DOC TYPE
❑ CURRENT PERMIT
TR APPROVED PLANS
❑ HISTORICAL FILE
❑ COMPLIANCE EVALUATION INSPECTION
DOC DATE
2008 m_q
YYYYMMDD

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rogM DRAIN E!ROFILE PROJECT LIMITS
STORM DRAIN PROFILE PF' 5
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STORM DRAIN PIPE SCHEDULE
PIPE RUN
SIZE/MATERIAL
UPSTREAM
N
DOWNSTREAM
LENGTH
(ft)
UPSTREAM
INV (ft)
DOWNSTREAM
INV (ft)
SLOPE
A
15" RCP
CB-1
CB-2
125.91
16.09
15.15
0.75%
15" RCP
CB-2
CB-3
105.24
14.95
14.16
0.75%
15" RCP
CB-3
FE-1
135.62
13.96
11.00
2.18%
B
15" RCP
CB-4
CB-5
58.41
16.19
15.60
1.00%
15" RCP
CB-5
CB-6
93.79
15.40
14.46
1.009ea
15" RCP
CB-6
FE-2
154.29
14.26
11.00
2.11%
C
24" RCP
HW-1
HW-2
265.89
14.98
9.73
1.97%
D
15" RCP
HW-3
HW-4
32.73
19.02
18.80
0.67%
E
15" RCP
HW-S
HW 6
23.62
17,19
17.00
0.80%
F
15" RCP
HW-7
HW-8
27.90
17,10
16.82
1.00°k
G
18" RCP
O51
FE3
26.00
11.50
11.00
1.92%
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PR
OJECT
LIMITS
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WETLANDS
1 inch 40 iL Horizontal
PROPOSED GROUND
-�
-�EXISTI
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ROUND-
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CONCRETE
Y-DUTY-
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NCRETE
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PAVEMENT
CONCRETE
31DILL CURB
SECTION G
LEGEND
- - - -20- - - -
- EX. CONTOUR (MAJOR)
-- - - -- ---- -----
EX. CONTOUR (MINOR)
20
PR. CONTOUR (MAJOR)
PR. CONTOUR (MINOR)
0'S7° -
FINISH GRADE SLOPE
X 20.15
FINISH GRADE ELEVATION
--___---=
EX. STORM PIPE
PR. STORM PIPE
®
PR. AREA DRAIN
®
SPLASH BLOCK
EOP
EDGE OF PAVEMENT
FL
FLOWLINE
SL
SPILL LINE
TG
TOP OF GRATE
SW
SIDEWALK
NOTES: HDC
HEAVY-DUTY CONCRETE
1. SEE SHEET C1.2 FOR EROSION
CONTROL MEASURES
2. GRADING IN LANDSCAPE AREAS AT BUILDING TO
BEGIN 0.5' BELOW FINISHED
FLOOR
3. REFER TO ARCHITECTURAL
PLANS TO VERIFY
DOWNSPOUT AND SPLASHBLOCK LOCATIONS
=
� C
SECTION A
BUILDI
G
PROPOSED
GROUND
EXISTIN
y
GROUND
SECTION B
SECTION C
PROPOSED GROUND
TEMP. ASPHALT CURB
REQUIRED IF BEQ P-632
NOT AWARDED
- BITUMINOUS CONCRETE PAVEMENT
ARKWG AR A
ISTING GRO
lrc
SECTION D
�PROPOSED GROUND CONCRETE SIDEWALK
rEX1STING GROUND CURB AND GUTTER-1
VALLE
GUTTER
31
BITUMI
OUS
�0
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=CONC
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ONCRETE SP
LL CURB
SECTION E
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BITUMI
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-_-_
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-PAVE
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-
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-GON2RE
XISTING GR
CURB & GUTTER
UND
SECTION F
2, ?008
SEAL
-
A/E EFD
WDC DESIGN
CSC•1•A DRAwN
JC REVIEW
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PROJECT MANAGER
FIRE PROTECTION
BRANCH MANAGER
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SEDIMENT 9 SIN UMM RY
MNL TRAP VOL - 1,800 CF/ACRE DISTURBED AREA (10 YEAR. STORM)
(SEDIMENT MUST BE REMOVED AT WNIII TYNCE A YEAR) 10 YR
SEDIIIENT DISTURBED MINN/UM BASIN VOLUME FLOW MN1. SURFACE SURFACE -AREA
)fin AREA (ACRESI VOLUME = ` (M AVA- P1 28
1 6.98 IZ564 20.009 15.27 6.652 21,654
NiNI � tN� r� � ill• � �,.. � � �
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N815 265 L 10 N74 5
�2T03'47" \ 34.14' -
/ "- 4071'18"
-36'34 56 9' - 0 sa 40 Do
R=15.00' L=8. -92 39,
L=9.58'
_ 1 inch = 40 ft� Horizontal
rNOTE NEW I. ANY AREAS ON SITE NIWOUT ACnbTY WININ 21
fALANDER DAYS SIfALL BE 7EMPORARXY STABILIZED AS PER
PER THE SPEOFE41M FOLLONNtG ANY PHASE OF GRAM#
Z INS PLAN TO BE UT1U2ED AND RENENED ONLY AJ CONdMIM
WIN THE WTIEN NAWAIK WWCH IS AN INTEGRAL PART OF
_ iM MR)" AND SEDIMENT CONTROL PLAN.
I ALL SLOPES SHALL HE 3.1 OR FLATTER.
4. ALL AOOF LRANfS 70 BE DIRECTED 70 STORM DRAINAGE
SYSTEM.
A NO NERAADS EVST ON SITE
G SITE IS LOC47ED ON DOUGLAS ROAD AT THE MICAS .00
PLANNED EROSION AND SEDIMENT CONTROL PRAC710ES -
CE 1. Practice
TEMPORARY GAVEL CONSTRUC710N ENTRANCE
Shall be installed at the entrances to the project
from an existing roadway. Drainage should be away from
the road and erosion will be controlled with downstream
practices. During wet weather It may be necessary to wash
truck tires at these locations.
2. LAND GRADING
Practice 6.02
Grading should be limited to areas as shown on the
Plans. Cut and fill slopes shall be 3:1 or flatter except
where specifically indicated. Care shall be taken during
land grading activities not to damage existing trees that
are identified as "to be preserved".
$F 3. SEDIMENT FENCE
Practice 6.62
Sediment fencing should be installed as shown on the
Plan, to delineate and protect wetlands and specified areas,
and around any temporary stockpile areas as necessary to
prevent any graded interior areas from eroding onto adjacent
Iands or roadway, or Into inlets, or as directed by Engineer
or NCDENR/LQS personnel.
Q4. P A LIN6m CHANNELS
All overflow swales to be ggraded to design
configuration seeded, and stabr10, if necessary with
temporary straw -net liners to collect and convey site water
as shown on Plan. After final project stabilization, swales to
be re -graded and cleaned of siltation as needed to establish
original design contours for stormwater conveyance.
OP 5. OUTLET STABIUZA71ON
Practice 6.41
Riprop aprons will be located at the downstream and of
all discharge pipes to prevent scour.
6. CONSTRUCTION ROAD STABIUZATION
Practice 6.80
Upon reaching final grade and after utilities have been
installed, roadway%parking areas are to be stabilized by placing
sub -base course of approved 4"mart stone or 6" ABC, as shown
in the typical street cross-section detail on the Plan, to
reduce erosion and dust during the remainder of building
construction.
SB 7• SEDIMENT BASIN
Practice 6.61
The Sediment BaIlin is to be constructed first (see
Construction Schedule) and Is the primaryry Practice to
prevent sediment from leaving the site. Detailed design and
spillway configurations are specified In the detail sheet.
SK & SKIMMER
Practice 6.64
A aedlmentation basin dewaterfng control device that withdraws
water from the baskla water surface, thus removing the highest quality
water for delivery to the uncontrolled environment.
IP 9. INLET PROTECTION
Practice 6.51
A temporary measure of wtre-mesh hardware cloth around
stew post# supporting washed atone placed around the opening
of a drop inlet.
CONSTRUCTION SCHEDULE -
1. Obtain approval of Plan and any necessary permits, and hold
a pro -construction conference prior to commencing any work.
2. Flag work limits and stake -out roads and storm drainage
structures for preliminary grading.
J. Install Gravel Construction Entrances.
4. Install sediment basin, skimmer and silt fencing as shown on
plan prior to clearing and grubbing site.
5. Construct gross lined channels,
and any other sediment control practices shown, prior to
rough grading roadways, site and stockpiling topsoil as necessary.
6. Install utilities In roadway/parking lot, establish final grades
and stabilize road/parking lot with stone base course.
7. Final grade, install non -municipal utilities as needed, and
vegetatively stabilize areas where building construction is
not imminent.
B. All erosion and sediment control Practices are to be
Inspected weekly and after any rainfall, and repaired as
necessary.
9. Upon completion of construction, the roadway/parking lot
Is to be paved, and all areas permanently
vegetatively stabilized. After site stabilization, temporary
measures are to be removed.
MAINTENANCE PLAN -
I. All measures to be inspected weekly and after any rainfall
event and needed repairs made immediately.
2. Sediment Basin to be cleaned out when the level of sediment
accumulates to 1.6' above pond bottom, 1.1' above forsbay 1
bottom and 1' above forsbay 2 bottom.
J. Sediment to be removed from swales when they are alpproximately
Sox filled or sediment level Is with 1' of top of ditch bank.
4. Sediment to be removed from behind any Silt Fence and
inlet protection devices when It becomes 0.5' deep. Fencing
and Inlet protection to be repaired as needed to maintain a
5. All seeded areas shall be fertilized mulched, and re -seeded
as necessary, according to specli6tions provided, to
maintain a capable vegetative cover.
6. Construction entrance to be maintained in such a manner as to
prevent mud or sediment from leaving the construction site.
Periodic toptiressing with 2-Inch stone may be required.
Inspect after each rainfall and immediately remove all
objectionable materials spilled, washed, or tracked onto
public roadways.
VEGETATIVE PLAN -
1. Permanent vegetation to be established in accordance with
'North Carolina Erosion and Sediment Control Planning and
Design Manual', Section 6.11, latest version. See Sheet C1.4.
ENGINEERING
LAND PLANNING
COMMERCIAL / RESIDENTIAL
COASTAL
SITE
DESIGN,PC
P.O. Box 4041
Wilmington, NC 28406
[phone]
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NOV % I 200y

AF I GE EASEMENT DHf \
OF SIDEWALK /S DRAINAGE EASEMENT LINE
IRADIUS = I 1.FT LENGTH = 19.9 FT
7d 9 B.
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,,_­_�BOUNDARY GE ENT LINE
RADIUS 91.8 FT ;11
RADIUS = 5RADIUS = SO
0 FT BORING 1 0 UWG1H - 17
LENGTH = 84 Fr SI = 48' w105.1 FT
10.1 SIOE3LOPES -� � \
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TLETSEE DE gTRUCTURE -
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DETAILWET BASIN
WETLANDS VEGETATION NOTE:
THE FOLLOWING SPECIES OF WETLANDS VEGETATION ARE SUITABLE FOR
PLANTING ALONG THE la VEGETATED SHELF
- SAG17TMA LATIFOUA (COMMON ARROWHEAD)
- SAGITTARIA LANCIFOUA (DULY( POTATO)
- SAURURUS CERNUUS (LIZARDTAIL)
- PELTANDRA WROMCA (ARROW ARUM)
IF ONE OR MORE OF 7HE SUM70 SPECIES IS UNAVAILABLE APPROPRIATE
IIETLANDS WGETA70V COMMON TO THE COASTAL NORTH CAROINA REGION
MAY BE SUBSTITUTED.
NOTES
1. TEMPORARY SKIMMER TO BE INSTALLED ON PRIMARY OUTLET STRUCTURE BOX
AND TO REMAIN IN PLACE UN71L SITE IS PERMANENTLY STABILIZED PER NCDEIIR/LQS
SEDIMENTATION AND EROSION CONTROL PERMIT. SEE SKIMMER DETAILS FOR INSTALLATION.
2. ORIFICE/SKIMMER ASSEMEBLY AT OUTLET STRUCTURE TO BE TEMPORARILY COVERED WITH
WIRE AND 57 STONE UNTIL SITE IS STABLE
ALL SLOPES
3:1 MAXIMUM
10'
10-min.
21.5'min.
SEE PLAN
POD
FOREII VOLUME
OF REQUIRED
HISEL
'
STORAGE TYPICAL
cl
® W
3'min.
os
PIPE
�
OUTLET
/15�,4000ef
OUTLET
PROTECTION
AS ON PLANS
(TYPICAL
AT ALL STORM OUTFALLS TO
POND)
FOREBAY SECTION DETAIL
NOT TO SCALE
FABRICATED GRATE TOP
4" 4
4" 4'•
TA FT
curUT
EL- 14.0
TE �
AR
TRASH RACK EL- 13.5
BOLTED IN PLACE
f�
0.2 FT
90 ELBOW DOWN
0.2 FT WER
4
879ELOW WSEL
EL= 12.3
4"
18" RCP
WELDED BARS,
GALVANIZED, OR _
5
OUTLET PPE
EQUIVALENT
INV.
-+`
NSEL 11 = .5
11.5
1 1NV- 11.5
1
10
B 3
1 �
20" PERFORA TO
12' :90NC:
OR GROUT
.
� 4 FT x 4 FT PRECAST CONCRETE BOXES
PVC W/ GRAVEL EL- BO
AND FABRIC FILTER
6 BASE
NC PRODUCTS 4848 OR EQUIVALENT
2 FT SUMP
FOR CLEANOUT
POND BOTTOM
ELEV= 5.0
SKIMMER = 2.5'
SKIMMER WITH 2' ORIFICE
SECTION VIEW
WET BASIN
OUTLET STRUCTURE DETAILS
NOT TO SCALE
CALCULATION SUMMARY FOR DWQ:
IMPERVIOUS AREA PERCENTAGE:
TOTAL AREA DRAINING TO POND - 303,884 SF (6.98 ACRES)
TOTAL IMPERVIOUS = 14,1951 SF (3.30 ACRES)
PERCENT IMPERVIOUS - 47.4X
REQUIRED SURFACE AREA:
AT 30 FT OF DEPTH, 901E TSS REMOVAL, SA/DA - 5.31
303,884 x 0.0531 - 16.136 SF SURFACE AREA REQUIRED
SURFACE AREA PROVIDED - 21,654 SF
1.5 INCH VOLUME
1 - 47.4
Rv - 0.05 + 0.009 x 1 = 0.05 + (0.009)(47.4) - 0.48 IN/IN
MINIMUM VOLUME - DESIGN STORM x Rv x DRAINAGE AREA
_ (1.5/12)(0.48)(303,884) - IA094 CF
1.5 INCH STORAGE VOLUME AT ELEVA7ON 12.3 - 20,009 CF
2 TO 5 DAY DRAW DOWN.
AVERAGE HEAD FROM STORAGE ELEVATION
TO ORIFICE INVERT = (12.3 - 11.5) / 2
a
0.40 FT
2.0 INCH PVC ORIFICE.2 -1 Q = CA (9h) /2
- 0.6(0.02181)(64.4 X 0.40)^I/2
- 0.06640 CFS
T - 301,319 SECONDS - 3.49 DAYS
FORESAY REQUIREMENTS: -
MINIMUM FOREBAY VOLUME - 2OX OF PERMANENT POOL VOLUME
- 0.20 x 69,148 CF
= 13,830 CF
TOTAL FOREBAY VOLUME PROVIDED -
FOREBAY 11 = 11,771 CF
FOREBAY 12 = 3,362 CF
TOTAL = 15,133 CF
i'l"
L
l i
0 10 20
inch = � tL $oXizontal
WIAGI: EASEMENT LONE
.40
WELDED FABRICATED TRASH
RACK W/SQUARE OPENINGS
SQUARE OPENINGS L 6"
4'-0'
SEE DETAIL o
o THIS SHEET I
7n FOR "1
TRASH RACK
6' -I 4._ 0. _ r g•
5'- 0' 0 0.2 FT WEIR CU
GA�PLAN VIEW
BOX PLAN VIEW
WET BASIN
OUTLET STRUCTURE DETAILS
NOT TO -SCALE
I
46 Fr
~--�1 TOP CF BEM
40 FT MAIM - I
\/\\//
WET BASIN
EMERGENCY SPILLWAY
FRONT VIEW
NOT TO SCALE
NOTE: COLLAR TO BE POURED AFTER 0
PIPES ARE IN PLACE.
REINFORCING AS NECESSARY.
In. z 5'.
e.
1.5'
MIN
WET BASIN
ANTI -SEEP COLLAR
NOT TO SCALE
VARIES 10' 14' 28'
�_ EMBANI(MENi TOP= ISO (SETTLED), = la25 (CONSTRUCTED)
M ` EMERGENCY SPILLWAY - 14.0
4
9f TOP OF GRATES = 13.5
w WEIR CUT/ (STATE STORAGE) = 12.3 STATE STORAGE = 2Q009 CF
NORMAL WSEL- 11.5 AdIDDLE OF 10. i
® 26 LF 18 �4� BOTTOM OF 10:1 SHELF EL- 11.0
ANTI -SEEP COLLAR BOTTOM EL= 9.8
........................................
.......................................
BOTTOM SWM STRUCTURE EL- 80 .................
. .. is .....:
- s ANTI SEEP �.� . smIMENr cLEAllour EL. s.s
COLLAR IE- 11.5 /
...........
SEE DETAIL ,� = 5
............
`yam
20 10'
WIDE
10:1 SHELF
VAPoES, 45'
_ EMBANKMENT SECTION
NOT TO SCALE
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APPROVED
COASTAL
AI -
SITE
DATE
APPROVED
DESIGN
IPCCOMMANDER
ENGINEERING
DATE
A/E
WDC
EFD
LAND PLANNING
COMMERCIAL / RESIDENTIAL
CSC+A
DESIGN
DRAWN
P.O. Box 4041
EJC
REVIEW
W17mington, NC 28406
DBI
OC
(910) 791-401
EJC
CHIEF ARCH./
ENGR.
PROJECT MANAGER
FIRE PROTECTION
BRANCH MANAGER
�pruunr,q,A
C�♦�Ar 04DESIGN
DIRECTOR
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CODE ID. N0. SIZE D
SCALE: AS
INDICATED
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EFD NO.
STA. PROD.
NO.
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SPEC. NO.
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CONSTR. CONTR.
NO.
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N40085-08-R-1411
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SHEET
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NAVFAC DRAWING
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SHEET NO.
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IP srepnwsaF- rrOTH k GRAiFL 114LFr PROT7'nON
Spedflcatlon / 6.51 - ConaWctlon SpedRatons
1. Unkfonnly Fade a sagas depresdan approaching the Wet
2 War 5 FT steel past 2 FT into the ground swronding the Met.
Span post evenly around the perimeter of the kdet a maximum of 4 FT apart
d Surrad the posts wit wire mesh hardware cloth. Secure the wke most to steel
posts at the tap, middle, and bottom. Placing a 2 FT flap of the eke mesh.
under the grovel far anchoring is recommended.
4. Place dew gravel (NC DOT J5 or 157 stone) on a 2:1 dope with a hoot of 16
Inches around the wke, and smooth to an even grade.
5. Once the contrbuthg damage area has been stabled , remove accumulated
sedment and establish rnd gradkig elevations.
6. Compact fine aeon properly and stabilized 4 with ground cover.
Maintenance
Inspect Wets at least weekly and after each *Hkont (0.5 in or greater)
rainfall event Clear the mesh wire of any debris or other objects to provide
adequate flow for subsequent nrlI Take care not to damage or undercut the
wire mesh during sediment removal. Repace stone as needed
Outlet Stabilization Structure
Specification 16.41 - Construction Spedfications
L Ensure that the srbgrade for the Star and rjaap follows the required (Ines
and grades shown in the plan. Compact any SI aquW in the subgrads to
the denaity of the surrounding undisturbed materd. Low areas In the
subgrads an undisturbed sol may also be Sled by increasing fine rpW
thickness.
2 As roW and grovel Star must conform to the specified grading Emits
shown on the plans.
3 Fter doth, when used must meet design requirements and be properly
protected from punching or tearing during Installation, Repel any damage by
removing the rota and placing another piece of Star cloth over the
damaged area. Al connecting joints should overlap a minknum of 1 ft. If
the damage is extensive replace the entire Star cloth.
4. ROW may be placed by equipment but take care to avoid damaging the
Star.
a The minmum thickness of the ripkp should be 1.5 tees the maxknum stets
diameter.
6. ROW may be field stare or rough quarry stone It should be hard angular,
highly weather-raistont and eel graded
6. Construct the apron on zero gads, with no overfall at the end Mae the top
of the rgrap at the downstream and lewd with the receiving area or altgh6y
below it
8. Ensure that the apron is properly dood with the receiving stream and
preferably strakght throughout its length. If a curve Is needed to fit site
condtions place It In the upper section of the apron.
9. Immediately after construction, stabliee all disturbed wow with vegetation
(Practice 6.10, Temporary Seeding, and 6.11, Permanent Seeing).
Maintenance
kspect rprp outlet structures after heavy rains to sea if any erosion around
or below the rpm has taken place or If stones have been dislodged
Immediately make all needed repairs to prevent further damage.
SFOSediment Fence t Fence)
fiaUa 662 -Construction Specifications
MATRIALS
Wes a synthetic Star fa6rkc or a pwvkw Beet of pdM:vWj4ema nylon,
po1}ester, or pdyeMy4ene your, which is certified by the manufacturer w
suppler as cani mnhg to the requirements shown In Table 6.625. SpMetie
Star fabric should contain ultravldet ray InhhAm and stablbers to
provide a minimum of 6 months of expected use* construction lie at a
temperature rage of 0 to 120 F.
2Fnsune trot posts for sediment fences are
1.33 Ib/ikiew ft steel with a minimum k no of 4 ft Make
sure that steel posts have projectens to faaditate fastening the fabric.
Ucr reinforcement of standard strength Star fabric use mire fence with a
mkikium 14 gauge and a mad en mesh spooking of 6 Inches.
Table 6.62b
Specifications For Sediment Fence Fabric
Physkal property Requirements
Fiterhg EfBdency - 85A (mm)
Tensile Strength at Standard Strength- 30 bbah In (min)
Extra Strength- 501b/1h In (mm)
Shery now, Rote - a3 gd/sq ft/min (min)
Cp4S7RUVION
1.Constact the sediment barker of standard strength or extra strength
s)nthetic Star fbric&
Iftme that the hekght of the sediment knee does not exceed 18 how above
the round suAae. (War fences may inpcund volumes of water suf8dent to
case failure of the structure)
3.Construct the liter fabric from a continuous rail out to the length of the
baniw to avoid joints. M m joints am necessary sekxrdy fasten the Star
cloth only at a support post Wth overlap to the next post
4.&W t standard strength Star fabric by wke mesh fastened seeumey to the
up slope side of the posts using heavy duty wke staples at loot 1 inch k %
or tic win Extend the wke mesh support to the bottom of the trench.
5.0en a wire mesh support fence is used space posts a maxima of 8 It apart
Support posts should be drhem securely into the ground to a minimum of 18
Inches.
6.Extro strength Star fabric with fit pot spacing does not require wire mesh
support fence. Shale or wire Me Ntw hick alrecity to posts.
7.Exawts a irmch approximately 4 Inches wide and 8 hales deep dong the
proposed Me of pots and updope from the barrier (figure 6.62a).
dBackSl the trench with compacted sol or gravel placed over the Star
fabric
9.Do not attack Star fabric to existing bees.
Maintenance
inspect sediment fences at least ante a week and after each rainfall. Mae any
required repots Immediately.
Shouts the fabric of a sealmenrt fence c l4m tear, decompose or became
heffectiva nWkcs it promptly. Replace burlap every 60 days
Remoww sediment deposits as necessary to provide adequate storage volume for the
next rah and to reduce pressure on the fence. Take care to •rid undermining
the fora during deancut
Remove al fencing materials and unstable sediment deposits and bring Me area
to grade and stake it after the contrbuting drainage area has been propedy
stabilized
Sedknhent Basin
Specifications / 6.6f - Construction Sped6cati ns
1.Site preparations -Gear, grub and strip topsat from anew under the
ernbmbrent to remove trees, veptatiorL roots and other objectmale material.
Delay dear*g the pool area unN the darn a complete and Men remove brush,
traes one other objectionable materials to facitab sediment demout
Stock* d topsol or wall contahhg organk matter for use an the outer
sad of the embankment to fa mote wgeww establishment Place temporary
sedknent contrd measures below the bash as needed
2.Cut-off trandh-Excavate a cut-off beach along the centerline of the earth
IN embankment tat the bench to stable sol materlat but ire no ewe make it
less than 2 It deep. The cut-off trench must extend Into both abutments to at
hest the devstkn of the rear aroai Make the minimum bottom NAM mode
enough to permit operation of excovathen and compaction equfpnnent but h no owe
less then 1 ft. Mae side slopes of the trench no ste per than 1., 1. Cenpadlan
requirements are the same as those for fine embankment Keep the trench dry
daring bodf og and co pactionape©tknx
Urnba kment-Take M material boa the approved a so shorn an fie plan& It
should be dean mirerd sol, free of roots woody vegetation, rode and other
objectionable moterid. Scaly aneoe on which tN Is be pieced before plating
W. nee fN material most contah sulRrdent moisture so it am be famed by
hand into a ball without cru eft If water can be squeezed out of the bet, It
e too wet for proper compactim. Place tN material In 6 to 8-Inch
continuous layers over the entire hength of the tN am and ten compact It
Compaction may be obtained by routing the ccrsbuctm houlkig equipment over
the tN so that the entire surface of each laywr is traversed by at Joust on
whed or bead bud of the heavy epdpment or a compactor may be used.
Construct the embankment to an elevation 10%hi0rer than Me design Wt to
Blow for setting.
4.Condult spNwaye-Securely attach the rider to to barrel or bard stub to
make a watw*t structural connection. Secure of canectans between bard
sections by approved watertight assen6lex Place the barrel and riser on a
firm, smooth foundation of imperyicus sd. Do not use pa'Wm material such
as sad, gavel, or crushed stone as backlit around the pie or anti -seep
ochre. Place the 1N matedd around the pie spillway In 4-Inch layers and
compact it under and around the pipe to at least Me same density as Me
adjacent embankment Care must be taken not to raise the ppe ban Rah contact
with Its kundatkn when compading under the pjse haunches.
Place a minimum depth of 2ft of had -compacted badA over Me pjpe spillway
before aosshg It with construdian equiment Maker the rise h place by
concrete or other satisfactory mean to prevent Notation. In no can &haw the
pipe conduit be Installed by cutting a Mush through the dam after fine
embankment is complete
SEmergsncy spillway-hstod the a wpwy spNway In wu etabeId eat The
achievement of planed elevefions geode, design WO, and entrance and exit
chamd slopes am on" to the successfid operate of emergency spNways
6.kMts-Disdnarp water into the bash In a mo wr to prevent eoslm Use
dhersons with outlet protection to divot sediment -laden water to the Ww
end of the pod aeon to Improve Doan trap eflidancy (Rekrancex Runoff
Control Mewwea and Outlet Protsctan)
7.EroskIn control -Construct the structure so that the aeturbed am is
mhknbed Divert surface water away from ban aeons. Compete the embankment
before the am is cleared Stabiles the emergency spitway anboeknent and d
other disturbed anew above the crest of the P**d spNway inrnedfaidy
after construction (Reframm Surface Stabilization).
BSafety-Sediment bashs may attract chlcien one can be dangerous. Avoid steep
side slapes and fens and mark beaks with warning signs if trespassing e
Mrdy. Fakir all state and local requirements
Maintenance
Chadic sediment basins after periods of significant runoff. Remove sediment and
restart the basin to its ar*d imendas when sediment accumulates to one-
half Me design depth.
Check Me embankment WNway% and outlet for easier dumags and Inspect Me
embankment far Pita and settlement Make all necessary repairs kmnedieldyk
Remove all bash and other debris /wan Me near and pod area
Land Qyk
Speclication 6.02 - Construction Spedficati ns
1.Consbuct and maintain all erosion and sedimentation contra practices and
measurer In accordance with to approved sedimentation control plan and
Construction schedule.
2Remow good topsa/ from wow to be graded and Sled and preserve it for
use In finishing the grading of al critical wow.
ASco* wece to be topseled to a minimum depth of 2 Inches befre placing
topsoll (Practice 6.04. Topsolhg).
40sa ad pub wear to be Sod to remove trees vegetation, roots or other
objecilasable material that would affect ire planed stability of ft M.
5.Ewwe tat MI materfd Is in of brosk mbbkk ads, Jogs, stumps
bulding debris, and other materials inappropriate for constructing stable
Se.
6JY= of IN h k)wv not to exceed 9 hales In thlaknon and compact the
kprs w required: to reduce erode, s%w1A settlement or other related
Poem
7.Do not hcwpwate bozen matwld or salt mucky: or highly ampeoA s
mote* into iN slopes.
Uo not ploos B/ as a frozen foundation, due to pomble subsidence and
9.1(eep dhesans ad other water conveyance measures bee of sediment doing
of pham of development
Iahlaak a p or springs encountered Ming construction In awards" with
approvst methods.(Practke 6.81, Subsurface Dean).
11.PrmasYy stablke all graded sew Imedatdy after find Wudhg is
cxrpiebd on each area In the going plan. Apply temporary stablkation
meows an dl graded anew when work Is to be Interrupted or delayed for 30
working dup or longer.
12Ens re but topeol stodples borrow asa, and spol awe am arkquataiy
protected from erosion with temporary and find stablhata meal rm, Including
seaiwlt fenehg ad temporary noosing as necessary
Mahtenow
Periodfcdy deck aN Faded wow and Me suppwtkhg erasion and sedimentation
cantrot pxtlan eapeclaffy after heavy rahfags. Pr mpty remove of
seisent from diversion and oMw watw-dgowal pactim If washouts or
bide one,, nepd' them Immediately. Prompt maintenance of smag NOW am
before they becsns significant gaffes Is an essential pat of an effective,
wasixm ad swdknanbtarr contra/ plan.
Construction Road'Stabkotion
Specification 16.80 - Construction Sped6calkns
I. Gear rom bd and parking .rear of of vegetation, recta and other
objectianabkr material.
2 Ensure that road cahatrucft follows the noturd contours of the terrain If
it is pos*k
.I locate pakkrg anew an naturdy Bet anew if they we ovoldle. Keep
Wades safNdent for almhoge but gserdly not more than 2 to X1
4. Provide surface 6niw;A and rivet wens runoff to stride anew by using
water tors or bsnauts $0ferencex Runoff Control Measures).
5 Keep outs and flbh at 2:1 or Batter, for safety and stability and to
kcN tde establishment of w0atim and maintenance.
6. Spread a 6-kith course of ABC' crushed stone evenly over the kl width of
the road and smooth to avoid depressions.
7. M ure seepage anew or sewaoBy wet anew must be crossed instal
subsurfoce dohs or potsd is fabric doth before placing the roused stone
(Pactls 6.81. 9 tusurfscs Drain).
a Vegetate all readedle dtdas, cuts, fills and other disturbed anew or
ofherwee app vprkWy stabilize as soon as grading is canpiete (Refers tee
Surface StubNzalov)
A Proide appropriate sediment control measures to prevent off -ate
seanentatkwL
Mahtemance
Inspect construction roads and parking anew pawcagy far anddam of
w1bae. Tapdrom with new, gravel as needed tledk road dtdres and other
seeded anew kr woslon and sedinentatve after nmof-Pm* ng roha
Maintain of variation In a hedth% vigoros conithn. Sedmerrt-pouting
arrow should be treated krinedat*
Permanent Seeding
The khm of seed and fertNzr, and fine rotes of appy dkm of seed krtlizw, and imestana
Ad be as stated below. During perlods of owwlapping dates, the kind of swell to be used
shag be determined by Me Engineer. AN ate are In pounder per acre (kilograms per hectare).
Mach 1 - August 31 September 1 - Fabruay 28
501(55kg) Tall Pesaro 50j('S2g) Tag Faces
409) Cestieds 5Kft) Can*@&
250211k9) Bermuderm lid) 35A'28kg) 8emnde ram (u huged)
500K56%g) FaMew, 500/(56Mg) Frtliew
40044500kg) Limestone 40009450Okg) Limestone
3*0 21 and Steeper and We Borrow Loeatons:
March 1 - August 31 September 1 - February 28
75K85kg) Tag Fwas 75/(829) Tag Feats
2508kg) Bennudeg►am (huled) 35K28W Bemwdagass (adoNed)
5001(56Okg) Fwfltrw 5a1K560kg) Fertiew
4WOw'450q) Lbrsstow 4000K45M9) Limestone
Approved Taff I n=
Adventure Adenture l Amigo Anthem
Apache Apace l Arid Austin
Brookatone 800111252 Bonanza l Chapel HN
Chesapeake triktain Coronado Crossilre I
Debutante Duster Fdon Fdcon B
Fkndawn Potts FkW= Fimelown I Gensee
Ands lirordarh hloundog ,aqua
,kgua N Kentucky 31 al y Hawk Mauch
Montauk Mustaq Qynpk Poor
Phoenk Pbde Reed
Rebel Jr. Rebel 1 Renegade Safari
Shenandoah Tow man Tomdavk
Trdbkaw Trb de algae Md"alf
Mfangler
FwMizw sh f be 10-20-10 analyse. Lim Witten approval of Me Fnghew, a ddawent
andysis of kralrw may be used to provided Me 1-2-2 ratio is maintink ed and the rate
of applkcatlan adjmted to pmids Me same amount of plant food as 10-20-10 w alIek
&m e= Seeding
FaUbw Ad be Me some mdph as apedRed for Seednng and Mulching' and applied
at Me rote of 4W bs (450 kg) and seeded at a rate of 5o pouds (55 kg) per hectare
Sweet Sudan sews. German MIM or bkeeevtop Mild drag be used h suemeir maths
and Rye limit Ming Be remaMw of Me yew. The Enghew wN determie Me exact dates
for using such kind of seed
Fertllzw Toodressiha
FwM w used far fvaineseleg an of roodnay am except skpes Z i and steeper shot be
10-20.40 witten appovd of Me Enghew, a aft t asd}ek of fwSkar may be used
provided grade and deal be applied at Me rob of 5W be per we (560 kg per hodae).
Fa taw used for t piessing an skpse 2:1 and stager and wide and borrow anus shag
be 16-8-8 gads and Ad be applied d the rate of 5W be per ass (560 kg per hedav)
Upon written append of Me Engineer, a dewed analyse of fertilizer may be used provided
the 2-1-1 raft Is mdhtdped and Me ate of application adniu W to provide to swab
amount of plant kod as 16-8-8 andyets
&Zkmental Seedlna
The khda of seed and pcpatan dad be Me same as specified for Seeming and Mulching:
with Me evocation Met no sentiede seed wN be used In the seed mod for spplemental
weft The aid of appgdstlas for applementd seeding may very from 25/ to 751 per we
(28 kg to 85 kg par hectors} Tn *dud rob per are (hadae) wN be determined by the
Engbew prior to, be fhp of tapdremfng and be Contractor wN be notified in vftg of be
rote per ocre (lacteal told quatty needed and anew on which to apply Me supplements
seed Minimum t1lop equjememt comike g of a wood wader shag be used for hrnpwdhg
seed Into Me sob' as to prevent ddtwbawe of esdOw vegetation. A domastr (bag and chain)
may be used ohm degree of dope peveis Me use of a sad seeder.
The minima mowing helot on gals project dad be 4 how (iW.mm).
Gili2hg Straw Mulch
0*01 wN be required an Ab project djaont to my section of roadway *we beftic
Is to be mastabed a delved during construction. In asae within 6 It (2 maker) of fine edge
of pavement atrar It to be giipd and Men Immediately locked with asphalt talk
Crimping of straw In 1Au of asphalt talk will be allowed on the p mpd moo to the klowi g
coadtlow - -
Al awe weeded and nwdahed drag be whpd and/or tucked with asphalt as aiectd by Me
Engiew..
tlinptng of be limited to dopes 4-1 or latter wales the Contractor can demonstrate to the
tigheer Mat steeper eloper can be nepthted without siring Me-1)pieah sectds.
Sear nuldm to be of suNgabst length aid quarry to w0dand fine cramping apemla and poise
adequate ground cower.
0*09 equpment halving pow source anal he subject to the approved o/ to Engineer
providng Mat mabum -spoei g of cr►npw Nodes dog not excel 8 how (200 mar).
Tm
1
na=y Gravel Construction Entrmc &idt
Sprmaola 16.06 - Construction S1xdRaaNaur
1. pear Me entrance and exit area of of Negetation, roots and other,
objectionable material and property "ithe IL
2 Piece the gavel to flee spedfk Wade and dmadans show an the plea and
smooth it
3. Provide d to carry water to a sedirent beep w other sultable outlet
4 We poteurtlet kErke because they Improve stabNty of Me kundafkn In
locatkaw mbjeet to seepage or NO water table.
Maintenance
Mahtah the gravel pad In a condton to prevent mud or sediment from Jemhg
the construction ate. This may require periodic tapdrushg with 2-" stone.
After each raddl, inspect any sbuctwe used to begs sediment and dean It
out as necessary hwnadlately ranove of objectionable materiels anlkd
washed or tracked onto public madra)a
SKSkkrhmw Sedtine/nt Bash
Sped6catian &64.7 - Canstruetion SJpedficot ne
MAIERWS
1. aeon, gnb, and stri the area under tide embankment of all vegetalon and
root mat Remove of srfoce sal contdnhg hIgh amounts of Bank matter
and stociple w depose of t prvWy Fiord objectionable material to be
designated deposal ores Place tsnpaary sedment conrod measures below
basin as needed
2 Ensue that iN material for tiro embankment Is fees of roots, woody
Mh Wo. organic matter, and other objectionabled moW . place Me' N not to exceed 9 Inds& and machine compact it Over IN the enbaknent
6 Inches to slow far settlement
J. Shape the bash to the specified alhhaskrs .Prewwht the skimming device
bom sftgy Into fine mud by excova" a shallow pit under fine skhmer or
providing a law appart under to skimmer of stone or timber.
4 Place the band (t)picaly 4-hah Scmedsie 40 PVC pies) on a firm, smooth
kusdatkn of Ipenfaas mi.. fir not aervhas materiel such w sand
gavel, a rm w crushed stone bauifil d fine pjse. Place me N matedd
around Me pipe spillway In 4-hch la}em and compact ft under and abroad
Ms to at least the some sonny w Me adjacent embankment fare must
be taken not to rise the pjpe from the time contact PM Its kksdatla when
canpocting under the pOe haunches
Plane a mhhwm depth of 2 feet of compacted baddN over tie p�oe
before p�kq 4 wM construction equipment. In no am deals the
conduit be Installed by cutting a mend, through the dam after the embaYment
is complete.
S Assemble the skimw kguxrIng the mauiacturas hstructkng or as dw*ted
6. Lay the assembled akkmmer on the bottom of the bash with the Be"
joint at the mkt of tie bawl plea Attach the hale faint to the bowl ppiIppss
and position be srinmw over Me exawted pit or support Be see to oftcdr
a rope to fine skimaw and anchor ft to the skis of the bosh. This WE be used
to PUN tine skimmer to the side for maintenance.
7. Earthen spBwa the spillway In undsbebed sal to fine groabet
extent as achievement ofplannedam a eknato g dmbm
aW en and suit dnanmd sopm are crftical k fine successmapautian
of the *Nwey. The mNmray should be Ihed with kmhated plastic w
hpwmeabb pat= fabric. The fabric mart be eke and lag anasgh to
aver the bottom and sides and extend onto the tap of the dam for arduaing
in a bench. Tel mmay be secured with 8-inch staplew s ph& Me fabric
must be long wroeudggfmto extend dam to cape and eat onto stable ground.
The wkdti of the fabric must be one piece, not jiohed or spllwsk otherwise
water can get under fine /mac If the of Me fabric Is hsandent far the
entire length of to spNway nuave sectiam spanning fine complete width,
may be used The sppw section(s) should ovekp the lover mcton(s) so
that water carrot Nor under the At& Seaes fine upper edge owaWd aides
of Me fabric In a trend WM staplss w pins (Adtpted lean A Maud for
Dw*hs Welling and Mahtahkq Skimmer Seiment Basin&- February
1991 d W. FakdoM N Soa.),
d kdeb-Dhasar s water Into the bash In a mwnar to prevent arose. Iles
asps daIns a dveraiarn with outlet to ~ seirnent-
lo kn to Me upper end of Me pod area to knprove bosh trep efficiency
A Fioslon antral -Construct the structure so bet the disturbed area Is
mimmared Merl surface water away ban base areas Complete the
embankment bAm Me area Is dsaed SIdift Me emwgencyy epNway
embankment and of other a rturbed aew above the aroet of the
spillway hnhsdately after amsbuatbn (Refasncer Surface Stabkolil m
i0 After of the sedment-producing wear have been permanently sldhJbeaj-
remove Me structure and al the unstable sediment Smooth the anea to
blend with Me adjohhg awn and stabNze properly (Refwences: Surface
Stablhaft). _
Impact skimmer sediment basins at least weekly and after each sgmfibent
(roe -half Inch or greater) rainfall event and repair Immediately Remove
ssdknmt and neetoo Me bash to its afghd ainenaans when sediment
acaunulates to one-half Me height of the Net batik, Pul the Warner to
one side so Mot Me sedment une math t can be excavated Eautute to
sediment ken W entiv bash, not jet around the skimmer w Me Rrat cal.
Make sure vegetation growing In f bottom of the bash dove not held does
me stoma
If Me skkmmw is dogged wkfh bash and Uwvj4 water. -In Me bosh, uwaly
)eking an the rope wN mdro Me skiniaw bob cup and dawn and dlslodgv --
Me debris and nestoro Bow: If the does not work pug the skimmer over to
the side of the basks and remove Be debvke Also check Me orifice ins is the
d*w w to see if It is doggek ff se remove be debris
If Me skinnier am or bard pie is dogged the arllke can be removed ad
the abatructan cleared with a pkmbwi sake or by Bushing elth water. Bs
sae and neylaoe Me once bekno nepfor npopdflahhg be skkmmvwpp,��
with fabric pm sChack Me fabric fired � width of ihe�p�p� amoo ny r Bun o n6ailm
*Nw)s and outlet for srasare damage and Inspect the embankment for
pov and sethernent Make cup shecmevy repaln kaneiaWys Remove d
am and other debris boa ft aiimnw and pod ass.
Fneezih weather con roast in fee kmmhg In Me bosh. Bartel special
precousshould be taken In be ante to pirmt be ddmmsr from
Plugging, We ke,
OCj Gies- end Gbannds
Specification / U30 - Construction *ad8ca0ona
1. Remove all treeg brush, stumps, and other objectionable material from the
kundaUan area and deeposit of properly.
2 Ewev le fine charms and shape it to neat lines and dimensions &how on the
plan pkar a a2 ft ovwwd around She d"d perimeter to sow for bulking
dining seemed prepanotkxns and sod WNW.
3 Remove and properly depose of all excess mi so that surface water may
enter the churns f sly.
4. The proced a used to establish grass In the mans wN depend upon the
severity of the candtions and selection of spedes. Protect the chu and
WM mulch w a temporary lk w suf c ent to withstand andcjoated
vdodties akuIng fine establishment period (APpenalk a05)•
Mahtwom
During the establishment period check grass -lined donnas after every
ahfal. After gross fee established parledswly, deeck the ehannek dud it
after eery heary an/dl event hrmeiatdy make nepaVa It Is patkala/y,
Important to dsdk to channel outlet and all road crossings for bank stabidy
and evidence of piping or sake hoes. Remove all significant sediment
accumulations to maintah the dexped cw)kmg capacity. Keep the gross in a
hedth, vigorous condition at of fine; since it is the penury eradon
protection for the chard (Rcetice 6.i1, Permanent Sewing).
► 'vas: ;�•COASTAL
.Ly
1SITE
ENGINEERING P. 0. Box 4041
•Wilmington,
1i' l 1 t •L. ��
1 RESIDENTIAL • 1 I M-
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WDC DESIGN
CSC+A DRAWN
EJC REVIEW
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EJC CHIEF ARCH./ ENGR.
PROJECT MANAGER
FIRE PROTECTION
BRANCH MANAGER
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PVC END
CAP\ PVC ELBOW
WATER SURFACE
PVC END
CAP
SCHEDULE 40
PVC PIPE
PVC TEE PVC PIPE FLEXIBLE
V' HOLES IN HOSE
UNDERSIDE
END VIEW
SKIMMER SEDIMENT BASINS ARE NEEDED WHERE DRAINAGE
AREAS ARE TOO LARGE FOR TEMPORARY TRAPS. DO NOT LOCATE
THE SKIMMER SEDIMENT BASIN IN INTERMITTENT OR PERENNIAL
STREAMS.
ARM ASSEMBLY
PERSPECTIVE VIEW
SK SKIMMER DETAIL
Practice 6.64
NOT TO SCALE
PVC VENT
PIPE
PVC TEE
FRONT VIEW
SCHEDULE 40
PVC PIPE
ORIFICE
PLATE
"C" ENCLOSURE
WATER ENTRY
UNIT
SEE DENR STANDARDS & SPECS.
FOR COMPLETE DESIGN CRITERIA & MAINTENANCE
NCOOT #5 OR
WASHED S
0
ENGINEERING
LAND PLANNING
I 1v1= 3
VARIES n= U.03
LINED WITH REINFORCING MATTING AND SEED
PER SPECIFICATIONS OR SOD. I
J.1 GRASSED CHANNEL
N.TS
—4' MAX —�--�
HARDWARE CLOTH & GRAVEL
DROP INLET PROTECTION
PRACTICE 6.51
NOT TO SCALE
NCDOT #5 OR #57
WASHED STONE
HARDWARE CLOTH
OPENINGS)
2'
COASTAL
SITE
DESIGN,PC
P.O. Box 4041
Wilmington, NC 28406
Min) 791-4441
PUBLIC ROAD
CA
a° F
6" MINIMUM
THICKNESS
.-•-•-.-.- F1
:;y�•�•�•��
COARSEAGGREGATE
GRAVEL CONSTRUCTION
NOTE:
FOR MORE DETAIL. 12'MINIMUM AS REQUIRED
TEMPORARY ON
PracticeENTRANCEZEXIT DETAIL
• /•
NTS
La
4 0 000
0 000o0o REFERENCE EROSION CONTROL
000000c CALCULATIONS FOR
°0000
SPECIFIC
DIMENSIONS.
OUTLET PIPE DIAMETER
(Do)
d50 = REFERENCE EROSION CONTROL CALCULATIONS
dMAX = REFERENCE EROSION CONTROL CALCULATIONS
La = REFERENCE EROSION CONTROL CALCULATIONS
MIN. APRON THICKNESS = 4.5"
NOTE: GEOTEX NONWOVEN FILTER FABRIC TO
BE PLACED UNDER ALL STONE
OUTLET PROTECTION.
9UTLET PROTECTION DETAIL
NOT TO SCALE
COMPACTED FILL OR
GRAVEL, EXTENSION
OF FABRIC AND WIRE
INTO THE TRENCH
FILTER
FABRIC
BACKFILL
MINIMUM 8°
THICK LAYER
OF GRAVEL
8"MINIMUM
V-TRENCH
—�
Dw- U�
RIP RAP
Dh1lENSIONS
L x w x D
a.Ass
oua�roTr
CUL4ERT C
15' X 5' X 1'
tl
3 CY
CUL4ERT D
8' X 5' X 1'
tl
1.5 CY
CUL4ERT E
8' X 5' X 1'
tl
1.5 CY
CURB CUTS
8' X 5' X 1'
tl
1.5 CY
6 F T. CENTER
NOTE:
SEE NARRATIVE
FOR MORE DETAIL.
ISOMETRIC VIEW
EXTENSION OF
FABRIC AND WIRE
/ INTO THE TRENCH
COMPACTED
FILL
8"MINIMUM
14"MINIMUM
SECTION
Practice 6.62
NTS
FILTER
FABRIC
4"MINIMUM
SECTION
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APPROVED
A/E EFD
WDC DESIGN
CSC+A DRAWN
EJC REVIEW
DBI Cc
EJC CHIEF ARCH./ ENGR.
PROJECT MANAGER
FIRE PROTECTION
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LEGEND
— — — —20 — —
— - EX.
CONTOUR (MAJOR)
EX.
CONTOUR (MINOR)
PR.
CONTOUR (MAJOR)
2
PR.
CONTOUR (MINOR)
__--___--
EX.
STORM PIPE
PR.
STORM PIPE
®
PR.
AREA DRAIN
Q5 DESIGN POINT
AREA(AC.)
\ 0 2D 40 !o
1 inch = 40 it. Horizontal
_ABEL
RUNOFF COEFF.
10-YR BASIN FLOW
(CFS)
COASTAL
SITE
DESIGN,PC
ENGINtERING
LAND PLANNING
COMMERCIAL / RESIDENTIAL
P.O. Box 4041
N41mington, NC 28406
[phone]
` "tIIIu
CA
0
SEAL
APPROVED
APPROVED
A/E EFD
WDC DESIGN
CSC+A DRAWN
EJC REVIEW
DBI Oc
EJC CHIEF ARCH./ ENCR.
PROJECT MANAGER
FIRE PROTECTION
BRANCH MANAGER
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LEGEND
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1 inch = 40 tL Horizontal
SEAL
APPROVED
APPROVED
A/E
EFD
WDC
DESIGN
CSC+A
DRAWN
EJC
REVIEW
DBI
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EX
CHIEF ARCH./
ENGR.
PROJECT MANAGER
FIRE PROTECTION
BRANCH MANAGER
DESIGN DIRECTOR
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+
+1s.02
------ �....
~ +10- - -------\
F8. SY1^_ `^ _ l ��_
+17.90
IENPORARY POOL ELEVATION = 12.42 / �' i / • to \7. 77 ` ~ . `\ i It
STORAGE 0 ELEV.12.42 = 27,612 CF 9
/, i \�� \ \ ` +S.So \ \ 1`06 `�\ Nt .)3 ! f
rr
+1Fa 28 // _ \ -`9 + s 1 r r r r
�' � it
\ 7'//' \ _iz 64 + I 1 i i i rl i tt \\
l 1 12.08 `��� 7� 11.7'♦'-11-A 0.901 t
5'X5'X3.3' OUTLET STRUCTURE:
TOP OF GRATE=13.65
(� INV = 10.73
INV OUTLET PIPE=11.32
2" ORIFICE INV = 11.28
2" WEIR ELEVATION =12.42
INV=10.76
• ► li'T:iA
NCDENR/DWQ PERMIT If SW8-0809444
1. IMPERVIOUS AREA PERMITTED
301884 SF (6.98 ACRES)
2 NORMAL POW. SURFACE AREA
21,159 SF
3. NORMAL POW. EIEVABON
11.32
4. POND DEPTH (DEEPEST PWNO
Z32 FT
5. POND BOTTOM ELEVATION (DEEPEST POINT)
4.0
6. ORIFICE INVERT ELEVATION
IL28
7. OURET BOX CREST ELEVATION
13.65
8. STATE STORAGE VOLUME
x CF
9. 10:1 FT VEGETATED SHELF
PRESENT
10. 10 FT ACCESS
PRESENT
11. FOREBAY
PRESENT
12 PRIMARY SPILLWAY El"ATON
13.65
13. EMERGENCY SPILLWAY ELEVATON
14.0
14. ORIFICE SIZE
2 INCHES
15. NEIR CUT CREST LENGTH
2'
16, IORCUT ELEVABON
12.42
17. SIDESLOPES (TYPICAL)
3:1
III INV. OF PIPES FROM OUTLET STRUCTURE
11.32
STATE WATER QUAUTY POND CONSIDERATIONS -
SURFACE AREA REQUIRED = 16,138 SF
SURFACE AREA PROVIDED = 21,159 SF
1.5" STORAGE VOLUME REQUIRED - 18,094 CF
1.5" STORAGE VOLUME PROVIDED = 27,612 CF
1.5" STORAGE DRANDONN BME = 4.10 DAYS
{ I i1t3.0\
07-
0r�z�
` , 3.96
1\
ON
\ t'
00
-F`5.05 73.95 \`
/ 1
`7y 14.52
10�8.74
#x<39'--_.
`
` f 1 \\
/ ! +9.14 �-
�-. ^��� `12 �~~`� �11.4$-"--- 1 /I i ' 1i-18.12
r
t
9''_,
t
i l
7 I 1
0,. -j / +11.29 I I I I
+10.74
>�\
12.42
1`5>47
14.40. -=ht1.07
6
/
14.17 . \ `� ,� `•.�^ i l +11.95
10.!!4 % +12.00 / 1 +10.13 �
���
'- ^. ��., '-+17.47
+1194
+11.97
+11.71
+11.72 10. I<\4++4Q\ `.�\
^8..`��`
`^...��
PERMANENT POOL ELEVATION = 1131 +14.ei `` +11
�
`�.,
+16.68
SURFACE AREA 0 B".. 11.5 = 21,159 SF _ 13. `` \'
,---7-
\+1o.3z ''
��� L
16.07
+15.20
+10.29
`+14.89`'
+14.95
+14.93
+10.26 JJt (( I l l
TOP
WELDED BAR�
GRA
TRASH RACK
EL= 13.65
FPBRLGp�D
BOLTED IN PLACE
0.16 FT WEIR 4
EL= 12.42 4"
18" RCP
OUTLET PIPE
-_
INV=
OUSEL = 11.32
11.28 INV= 11.32
�1
10
3
.12" .9ONC. .
1 2. 0" PERFORATED
1 OR GROUT
PVC W/ GRAVEL
6 BASE
AND FABRIC FILTER
2 FT SUMP
FOR CLEANOUT
POND BOTTOM
ELEV= 4.0 SECTION VIEW
3.5 FT x 5 FT PRECAST CONCRETE BOX
WET BASIN
OUTLET STRUCTURE DETAILS
NOT TO SCALE
AS -BUILT WET DETENTION BASIN
EMERGENCY SPILL WA Y
FRONT WEW
NOT TO SCALE
+14.79 �`132��+_11l-8���` 1%"�. !l // / i +74.48
+14.89
� - --- +14.82
+14.59 +14.9'i.� +15.21
+14.89
NOTES:
I. SURI0M PROVIDED BY JOHN L PIERCE B ASSOCIATES
2 ALL DISTANCES ARE HORIZONTAL
a ELEVARONS BASED ON NGVD 88
4. IE MAP IS NOT FOR RECO4DARON, CONVEYANCE; OR SALES
11
LICENSE j C-2770 v
COASTAL
SITE
DESIGN, PC
ENGINEERING
LAND PLANNING
COMMERCIAL / RESIDENTIAL
P.O. Box 4041
Wilmington, NC 28406
[phone]
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p�.Fps
frjSP
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