SW8080414_Approved Plans_20080416

19 GENERAL NOTES: co OD
j LLI
CA181 zi CT D
5- S F- 00 M
E 'IT /LOTS 124
20'WIDE CONVA AB(� SHORELINE at WESTGATE 1, TOTAL LIM
._.�MERGENCYACCESS M
.. . * - ;5 '. R=45�5' 2. EXIS ING ZONING = i IF-M < Q 21
4
7n6
61
4
3. TO I AL ACREAGE = 18,65 ACRES
4- OPEN SPACE 5% OF GROSS ACREAGE 0.93 AC. REQUIRED: 1.11 AC. PROVIDED
SINGLE FAMIL HOMES
IZE: INTERIOR = 41.00'X50,00'(2,050 S.F.), EXTERIOR = 43.00'X50.00'(2,150 &F.'I YVATERFORD
5� LOT SI
NAAGNO-LIA
R=25,5' ..q. 6� COMMON AREAS, ROADS, AMENITIES, ETC. TO BE 1`0AINTAINED BY HOA
SHADOW BOX PENCE GREENS
-7
TTO
7, ROADS ARE TO BE PRIVATE, BUIL DOT STANDARDS & MAINTAINED BY HOA co
ALONG PROP, LINE In7
4,121 L,F, OF ROADWAYS 17
GATE WESTGATE DK LELAND, NU 8, WATER SERVED BY NORT" H BRUNSkNICK SANITARY DISTRICT
Z Z
9. SEWER SERVED BY NORTH BRUNSWICK SANITARY D T
Owner.- SD West, LLC 10, ADJACENT ZONING= IVIF-M Prolect 1 0 0
ISTRIC
23' - E
F- " W
1, BOUNDARY INFORMAT ION TAKEN FROM DEED COMPOSITE PREPARED BY LOCCtion 0
n
6105 Oleander Dr. HANOVER'DESIGN SER'VICES, P'A., DATED: MARCH 9. 2007 > Fy CO <
4 LIJ
12� MINIMUM SETBACKS:
'0 4)
Wilmington, NC FRONT 25� W
SIDES 7�51
REAR 30'
13, THERE ARE NO EXISTING STRUCTURES, RAILROADS, BRIDGES, ETC. ON SITE,
14� NO MARSHES, SWAMPS, PONDS, LAKIES OR STREAMS OCCUR ON SITE, US'z1_'110EE
LU ACTION ID 200600669, WOODED AREAS ARE PREDOMINATELYSECOND GRO'WTH
.0 PINE WOODLANDS, NO SIGNIFICANT HARDWOODS HAVE BEEN IDENTIFIED. VICINITY MAP
15; 100 YEARFLOOD PLAIN SHOWN ON MAP,
N. T I'S.
I& NO BUILDINGS ARE PROPOSED WITHIN THE 100 YEAR FLOC'DPLAIN.
17. ALL UTILITY EASEMENTS WILL BE PRaVIDED INACCORDANCE WITH THE
R=25' R=25� REQUIREMENTS OF THE JURISDICTION.
18, NO BUILDINGS OR PROPERTY WITHIN THE SUBDIVISION ISLOCAJ ED ON THE
U.S. DEPT. OF INTERIOR NATIONAL REGISTER 01- HIST RIC PLACE10-
19. AVERAGE BUILDING ELEVATION 26'. AVERAGE: ST REET ELEVATION 235,
20. STORMWATER CONV"YANCE SYSTEM TO BE LOCATED OUTSIDE STREETPAV
I A EMENT
21 STORfV1V%JATEER MANAGEIVIEENT POND AND THE ASSOCIATED OUTLET STRUCTURE WILL
EMERGENCY ACCESS RACT -7
BE DESIGNED AND CONSTRUCTED TO MEET APPLICABLE FEDERAL, STATE AND LOCAl
L A
N P _- 0 C E A N 111'_32 A T L! C'
N.T.S. REQUIREMENTS.
IC NCDOT ROADIWAYS ARE PROPOSED kNITHIN PRO IECT�
22, NO PUBLf i2l'
7
N E D INvil F M 23. PARKING ACCESS TO EACH UNIT - 3 SPACES. 65 ADDITIONAL' PARKING SPACES. W cc,4, 'p
<
0
Existing S.S. Manhole
2' Wirl- CONAP A 1"TFDABC'_
A-
,R=45.5' Pror,--
K Future IR
S 17`044'25" W S 13030'49'W
R 25'
R=25,; �s:. A SHADOW BOX FENCE 26.02 18.43'
GATE ALONG PROP. LINE S 12014'57" W 1453.55' -60-
\N�kel
2ZL0' 2 0 U
30.0'- i I TURNAR' UN
-20- -20- B.
0z 7 97
0' F R 0 INA 116 113 11 108 z C.0
k oil (0
ROUNDABOUT
10
1ST 102 1 U I
lv� I 1 105
HN., D IANCE
18f7 PER TIA FRONt 1 00 CY)
RANAEY&KNEMP.
CY) N
00
D-RIFTIWOOD-DR,IVE - PRIVATE Retaining 'A'all (N c�
P (U 0)
U-) LLI
R =3) � I X
30
IYP, YP, TYP�'
A -21- LL
28.0'
59 )4 65 67 68 Z 0 c)
PICNIC SAJ,!P I
TABLES S110-
74 GKIL
75 77 78 79 Ref- g CD
(D z 0 C�
_U
0 < Z ce)
57 _U
5'S,DD,VALK
PICNIC 00
T, a'- E S 0
-11 R=25' R=39
0 cl
CID
PC) STORMWATER
56 89 90
54 53 < it MANAGEMENT POND
0'XI/t, 82 86
-21 50 49 21-
�DJL Typ_ 48 47
0
z
\1"S1\)N
'BDI R=100' Y LA PRIVAiE
W
V, Alki- SEASPR
AA
W0,X-7­\ \
2 144
A A
4
5 43 92
10 12
N
_!p-, - 95
40 96 z
'/J/ i FOREBAY
i9 F/ 5'S'__
--VA
L
38
P"�O'O q7 -21- C z
lyp.
-StAIA' 35
'1A 33 LLI J IL
LEV- 32 0%,
17 At
IA 31 "1
1-4
?16 ­ I VV
LINE TABLE CANOpy R IT I-
12 " E,:s yp.) N -0 18
PER AND
LINE LENGTH BEARING LINE LENGTH BEARING ?tin U)
�07 S78`28'25"W L20 111.80 Ll 3�4.89, 19
LI 0 SI 704&_'56"E ­21
I NO'l E: 21 PIC NIC
8. 8 6 N 18')48'0'/7 'W L21 .122.52 S63043�46"W 22 ES
32.80 N0'13028'53'E 55.49 S80014'28"W common area to Home (Property) Owners Association (I K 23 GRILt APPROVED
I 710"E 1.29 S58057'31 "W All areas outside of home footprint noted below will be
33�81 N0401 L22 T D
L4 23 -10A). A'CT 9 24 5 NORT CAROLINA EWIRONMEN WJ
LO
"09'37"W EMENT COMMISSION
41.88 N24016'401 W L24 43.38 N711 These include but are not limited ' the roads, sidewalks, TP, I
-70CE/_-\NGAl'_ _21- H DRP >
15. 7 5 clubhouse, recreational areas, stormwater pond, etc. ;k
HOES
L6 N 120 4 51 555 , T-_ L25 25.84 S81024'54"W 27 6 DIVISION OF WATER QUALITY 0
6/3 0
25�255 N0500 I'02"W 1_26 '1341 �05 N 670 9'1 8"W 18 28 C
L INAF-M
L8 34.80 NO 28'0 "'W L27 56.95 N471135'46"W 4.0 30 TABLE'
T 0
LIO 2 6. A I N08002'36'W 210.12 N -I 2056'23"E IMPERVIOUS A!-IE LU
32.86 N380'19'03"W 128 30.70 N`003�09"W
1-9
L L k­
2 4. 8 8 N08017'03"W L-0 29.85 N08015'02"W INTERIOR EXTERIOR 2631200 - Apts,, 4 (9,400 ea.), incl. drive
�_05�7'73- E I
L 1 16.43 4-1.94 S2_5014'08"W
I N880 I 2'53"W UNIT UNIT 50.01 27,900 - Apts., 2 (4,650 ea.), incl. drive
L 1 3 55 4. 5 9 S090061 -1 0"E L32 2 7.8 6 S45`38'557"W 135,524 - Streets, sidewalks and extra parking R e t ai n irn gg
A 2,075 - Gravel AccessDrive
1� 3 2. 0? 9 S2002 -,I �200"E L33 31.49 N72038'49"W
L15 44.9-5 S601 31�47"E L34 -� �10 1 2,600 - Clubhouse and pool concrete DRAWN BY:
-8 N49'32'37"W 431 �299 - Total Impervious
40.12 S23`52'2 1 "W 135 36.82 N I 9�-O 1'44!'W
53,1% - Impervious Percent AM
L-I 7 3.2,-� S07'042*05"W 136 34.43 N21 36'25"W
2
-erCle n-oul 812.63-11 - Total Project Area
IM 0 N Sew CHECKED BY.
�1 8 33.3; S230_52749"W L37 27.75 N556`281307"W
rA// fwaterm ters
TVF-,D
1+ 05043'42"W I L381 10.201 N311007'111"W
L 91 13.=
I
150 S 41 In MFA
2" 0/ �5A APR _' 6 ?008
TYP. 35' WATER, SEWER & STORMWATER 5ff SCALE:
35,0'
BYQI
ESM'T CENTERED ON ROADWAY
tsH�11 ; "" - 1%, 1 ... 11 it
6" _`1%U8C SUB -BASE H" ---44" MIN. 3000 PSI (TYP.) 1 60'
CURB CURB
SCA, 6un'
1-2,5'-' 22.0' _2.5"� 4" COMPACTED ABC SHEET NO.
PRIVATE ROAD PROFILE TYPICAL UNIT INTERIOR Siru""EWALK - PROFILE- SITE-1
60' 30' 01 60' 1 /_0 1180,
N.T.S. N.T.S. N.T.S.

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kv
DRAWN BY.
RAM
EXISTING CONTOURS
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CHECKED BY:
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SCALE:
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STORMWATER CALCULATIONS:
Rainwater Runoff-
Wet Detention Pond Volume
Pond Surface Area:
Draw Down Time / Orfice Size:
10-Year Storm:
1-Year, 24 Hour Storm:
7
Treat first 1.5" of runoff
SURFACE VOLUME
From Table 102 BMP Manual
( )
Q = C° x A x 2 g Ho
Tc = (K 1128} x (L^ 3tH} rt} .385
Use 1 yr., 24 hour storm
equates to 0.16 in./hr.
76
Impervious Area - 435,074 / 773,700 = 0.6623 or 56.23 %
Elevation Forebay Pond Comb. Forebay Pond
Comb.
Cumm.
Q - Discharge (cfs)
K = 0.40 (paved)
-
Drainage Area - 773,700 Or i 7.76 acres
{Ratio of Surface Area to Drainage Area}
Pond Depth
CD- Coef. of Discharge = 0.60
L=1,640'
H = 26-20' = V
17
3.3 - - - Bottom
Impervious 3.50 3.84. _ 4.00_. _
A - Outlet Orfice area cross-section, Assume T' diameter
Q = C i A
WATERFORD
G
MAGNOLIA
4.3 1,980 1Q350 12,330 Sediment
50.00% 3.70 3.43 3.30
1.5 x 1.5 x 3.14161144 = 0.0491
Tc= 8 minutes
GREENS
ImpeR►10U5-Area
5.0 2,610 12,380 14,990 1,610 7,960
9,570
9,570
o
56.23 k 4.20 3.80 3.61
4" _ _
OR using a diameter 2 x 2 x 3.14161144 .0873
C - 0.10 (Pre -Development)
.�
e °Area
Area /0
6.0 3,130 14,330 17,460 2,870 13,360
16,230
25,800
o
60.00 /0 4.50 4.02 3.80
g - Acceleration of Gravity = 32.2
_
C - 0.556 (Post -Development)
� �
7.0 3,730 15,510 19,240 3,430 14,920
18,350
44,150
Ho -Driving Head (ft.) - Use Ho/ 3 to compute drawdown
Use 10 r storm at 8 minutes
Y •
i - 0.16
Apt. (incl. driveway) 291,100 37.62
8.0 4,150 17,350 21,500 3,940 16,430
20,370
64,520
0
Depth Surface Area at 56.23 /o
due to level variances =1.613
equates to 8.54 in./hr.
A -17.76 (773,700 sq.ft.)
C>
z
Clubhour,e (w/ pool concrete) 2,600 0.34
9.0 4,780 19,310 24,090 4,470 18,330
22,800
87,320
. ,495 sous
3.50 0.0420 x 773,700 = 32,495 sq.ft.
„
0
,,,
Streets, >idewalks, Parking 135,524 17.52
9.5 5,210 19,860 25,070 2,500 9,790
12,290
99,610
_
3.84 0.0380 x 773,700 - 29,401 ft. - Required
sq•
Q = 0.1727 cfs (with 3.0 Orfice)
_
Pre -Development: Q = 0.10(0.16)17.76 = 0.28 cfs
Project
�
0;
Gravel Drive- 5,850 0.76
10.0 5,900 23,580 29,480 2,780 10,860
13,640
113,250
q
4.00 0.0361 x 773,700 = 27,931 sq.ft.,
Q = 0.3070 cfs (with 4.0' Orfice)
Q = C i A
Post -Development: Q = 0.556(0.16)17.76 =1.58 cis
Location
�
--
10.5 - 33,780 - 33,780 - 15,820
15,820
129,070
_
Total Impervious 435,074 56.23
p
11.6 - 35,660 35,660 * - 38,190
38,190 *
167,260
Temporary Pool Volume = 53,782 cu.ft.
C - 0.10 {Pre -Development}
421
12.8 - 37,580 37,580 * - 43,940
43,940-
211,200
Total Proposed Pond Surface Area - 29,480
Seconds per Day = 24 hrs./day x 60 min./hr x 60 sec(min = 86,400
C - 0.556 (Post Development)
70
Lawn & grassed Areas 338,626 43.77
i - 8.54 _
�
* Volume per Surface fncreasesdue to Retaining Wail
Using a 3" Orfice:
(n sa• )371
A -17.76 3,700 ft
Drawdown time = 53,782 / 0.1727186,400
Permanent Pool Volume - 113,250 cu.ft. (at elev. 10.9)
= 3.60 Days - OK
Pre -Development: Q = 0.10(8.54)17.76 =15.17 cfs
Permanent Pool Surface - 29,480 sq.ft. (at elev. 10.0')
Post -Development: Q = 0.556(8.54)17.76 = 84.33 cfs
Volurrie Caic. - SIMPLE METHOD
Average Depth of Pool - 3.84 it
Elevation at the Bottom - 3.31Y
Using a 4" Orrice:
Drawdown time = 53,782 / 0.3070186,400
P
Rv = 0.0 a + 0.9 x to = 0.5561
- Forebay %(at Perm Pool) - 19.1 % (Total Forebay Vol. Total Vol.)
= 2.03 Days - OK
(ta = Impervious - 0.5623}
S.
Use 3" diameter Orfice
N.T.S.
Volume _ - 3,630 x Ro x Rv x Area
Required Temporary Pool Volume - 53,782 cu.ft
Actual Temp. Pool Volume - 54,010 (at elev. 11.6')
Volume = 3,630 x 1.5 x 0.5561 x (773,700 / 43,560) Acres
Free - Board Volume - 43,940 cu.ft
Level Spreader
= 53 782 cubic ft.
m��c>!�
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Q from the drawdown = 0.17 Max.
USE SIMPLE METHOD 53,782 cuff.
_ DRAINAGE AREA - 773,700 sq.ft. Level Spreader Length =13' x Q = 2.2'
Use the minimum length of 13'
Includes all areas except for Recreational areas which will be
grassed With no impervious areas. Also includes the off -site
- gaveled road.
Xfstf
ng
_ = z-
NOTE: � N
:111 {n r Q
-- ELE�IAI•ION 10 IS THE 10r°���,
Existing S.S. Manhole YEAR FLOOD PLAIN d' '�.d , .�
6.2
� '�t
,s
nvert center of gravel road 3o flow to D1-16
j5
A---- - -- A
Main z� r , 5T I DI-1 6 b 2�#.9 2�t.4 d.3
ate` _.____e �...#__ _._ _ �.� .. �� _ `_- - - - __ - - - _ --.
--- - --- ..,... ems--- _ �. .�_ - DI- 17 �- - -- _ r t
S , �. 4.b _ Swale to Drain Inlet Swale to Dram Inlet- 4' - _ 2 - - _ _ --t < \ 4.1 ,2i �\ Swale to Valley Cer % \ i 1t2 i
SWC1l� to Drain (nle ¢2y� o - - ---- e� .o--- RIM =24.5 Swale to Drain Inlet X Swale to Drain _ -24---. ln% X -' \ ..-- 1 3.2 t 1 }l t1
----- ------
I 1 �_-__ram-_�- \ ---- -- ---ti INV.=21.44 ----- -__- Di-24 - .�, aketat�rat` ` �_ -- t t 1 r y1 t
% r �' a
1 I RIM=23.4 _ 1 1 _ j - t t s y18\18�h t 3:1 Slok
I r' \r t INV._21.0 _ _ - -'�` 9% l I t I 1 l �r \
t l r f I - � ✓'- -- I � �98) Q...a` i 1 / / / � I � l \r �, 'l CU
I 14 12 122 121 x2 2 120 aFFE.260
317 11 b 1 115 114 113 ' 112 111 11 fl 109 I / i t �, 108 t 99 I .2 .o' J r r > e l - 'fit �l `�
`._JI �/ ! G lM�
I FFE 26. @ 1 fl7 1 fl0 _ s lFE. 6.5, _ FE. 6.0EFI 5. \
1fl2 1fl1 ___ t / D AINAC�E AREA DELINEATI{�N , r
t FIFE. 5. 105 A 104 @103� \
Of j _ - _ i \ _ _-' _ FIE\ p. 9 . t e Structure t'' 0 r. storm)
*1, � C��t i S",�cf,tr ,, I �
_ I - 18 r , - , 23 "` - - r _h _ Re thin l alf 00 ram.
y _ _ \ \�` \ , r c5' CN
Hardened Ether. Spillway M
RIM 2 .0 \ !/ - 26 RIM=24.2 ' 4' RIM=24.0 -"' Cp` ' Retuning Wall \ \ g Level apre�der vl �'
---
t \ 1t1V.=19.80 . --r f Ct - 3 8 30' Square's`ega:ative Fitter �-
r �.8 44 g.1 1 4.l i IM=24.2 CA INV. 20.27 3.5 ---- --- 23- RtM=22.5 t R r \ Z3 CV G
2 2 INV.=21:7 7� , }
% r - - -- - - _-�_-__--- - -- -----cc
- I 2 It q - -
1 3,3 C -25 X2j /i (/ \ �.�
U - ------ - "- _ � RIM=23.0 i „�. Pondl nt.Access - y _ X
r r nl ``- CU
INV.-2066 r/ / v"ram e �\� �\ \ C`„ ' ®"'®l$� j L
/ f 1LL
c� FFE. 6.5 FFE. 6.5' FE. 6. , f - _�- t t r rt \ - 1' - - = ---� iE i$
t t FFE. 6.5' � -- I , i \ s_ - t �I. _ �•� \ ,.. � �,..-. l , F
t'�r, -\ \\� - - - �. LL
Ni358 m t r b1 b2 e" b3 64 b5 f 66 _r\ b7 b8 69 70 N 71 72 I \ ,� I_r - -_� < t r-\ �--�� \ U o59 60 � FE. 5. I� - � ' \ � tt � /l a 1 1 73 , \ \ r O \ I x' r 1 t, l t 74 , \ \ sp l a ( and Maint. Access` - ` /f I �_ \ . __ - \ `\ \ l -! 1 ( __ \ 1 DI 2, n I R Refatnrn alI DI - 28 / R } - - _ \\ N
t toy 4 FFE r ! > t l l l tt - ------ - 7, 4 \ C'o 7$ 79 \ i ' \ gx�,r `F9 tri1i `'' _ e`" \\\ I r
- � i � ,.. \ i l ! d � �tr 1 t \ \\\-- -- \� \ \ 1 1 Q�
• Nam. Z�r __ r > , 77 t \ _ -\ \\\ 0 \, .\ , -0 p
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CO a 41 Q-- ------ L IVV1 - ✓ ��� \ 18"RCP INV=1 1" Di- 30"RC? j\ �\
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w v l -----_ r r 81 89 C9)
o. �� _ - RIVt AVER \\ t \\ ,\r0 t,, tg 0)
4 a-Cl- } t cis /tt , i! r v l 0 p t 1 \\�\
r ` 1 \\ , / 5b 55 W v, .- ! 88 r 1 tr \
_ to �a t ., s z 4 1 I V u A r MANAGEMENT POND \\ \
RIM=24.5 I \�.\\: 4- F � ��Cr 5 53 to t 7 o ? �'CF 8 / 87 _ l \\ �'
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N �r-
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r %�� .� •- \ U ,.. r / / - `'' -, ----..`� `�-`���\\\\\ iD:tlVec. Sheit\�\�\��•1\ �\.1`t\ F4 -r ,.-e -- -� -- ----2�----f• - �
a, S .�
,
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_
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m.` _-- _--2.5'--_--� �- / i I r \ t2 i ii_FORE $AY i
- r � .- _� FFE 5.5 - s 1 •.� l r r r r
DRAINAGE AREA DELINEATION -..._wale to car '-~-- �s--____-----� � 1 l l v r � � � � ___- � t 1 1�7�
Inlet l !� _ - 38
37 t _t s• I 1
to ! `=•---_.,.,,..•,,,� Swale to Drain Inlet-- _. _._ DI- 14 ..... _ � "' 1 ( '`' .,. �, \ -- -- - ..._ � _ / / l f t CI 4 � ": : `P-►•�-�-= ��1II;'�f� I
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_- _-- - ✓, �I
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- arn7h 2Q ► \ 1
Catch Basin Details
.�.`"�,.` -'` "-S�vat�,� � . r ^� 23 FE:, 5.0
10
C; rb-1 let Detail For Directional Flow - -~---1 25 \ t
. U n S o�, _ @2D6
22 _
FRA SE GRATE & HOOD ASS'Y M - '" 1 27 FE. 4.5 - D1 '52f 1r �I ft 0
' RAISED FLOW l v `23.0 �- _ Swo/e to ' _ r r
ARROW 1/16'_ HiGH 2aS rain 1 ~ �$ 2g /� RIM-22.7/ � � /
�,rthf ri / INV.=14.3 `� ` / CL
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1
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DETAIL SHOWING TYPES OF GRATES TO NOTE:- __?, o �, O CO
BE USED ACCORDING TO WATER FLOW. See above Ian for Pi a Invertsanto f 1. -� , jf I CO
p o P P
each catch basin. f/
- � � TYPE „G" TYPE "E„ TYPE "F, f t t -�"
>n O
„ I I V The Invert Out will be 0.1 lowerthan f DATE:
1.5 ��� � 3IN I:1 Slope/ /// / Retaining Wall
WATER FLOW SAG WATER FLOW the lowest Invert In for that basin. Curb Inlet (CI} Drop Inlet (DI} '\ I ` "
A O 08
Storm Drain mine`
DRAWN BY.
This building (27-30) to include gutters on VJ
---------------------- -
back side and piped to Drain Inlet (32)
B�
PLAN CHCKED BY:
---- EXISTING CONTOURS
3.26' SECTION - BB
_--------- PROPOSED CONTOURS IVIFA
SCALE:
PROPOSED SPOT ELEVATIONS
35.75"
1'° '
. co w
--_-----
N _. ---- ----------
_ 1
SCALEmI= 60' SHEET NO. .
SECTION - AA
WATER FLOW SAG WATER FLOW
If
-► •• --
L iUn T L
FRAME PLAN 3.25" TYPE "F' TYPE "E" TYPE "G" 60' 30, 0' 60'' 120' 180,

Retainingi
co
Z
Pond
Access
/ "".....
ry
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o Of
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Outlet Structure (I 0-yr. storm) &
Hardened Emergency Spillway
STORMWATERMANAGEMENT POND 0
ha OUTLET WEIR STRUCTURE
� � / / * '� � {� � mow•
3:1 Slope (z = e/d = 311 3)
- . /_ y r-' s �--- _---� l ! ¢ Area of Flow A = b x d + 2 d x d
/ // t((f ff f, //� 1 Elev. -12.8'
f� /
'e 1``— .. , - ''• I I d -Depth of Flow
E[ev. -11.6' ,
V � .Po.�� - Co
Z CD
1 ' Level - Tr Discharge View a) M
Hydraiic Radius (R) = b x d + z(d x d)
m os
M-0 co N.T.S. b+ 2d z x z + 1 00 N.
r-
Ail
® X
5 Cd
5
ca U_
Temp. Pool, Elev. 11.6' I �~
3 � c�
Perm. Pool, Elev. -10. ' .�
e
g�oP N
3•� 0
,25 Ae 20:1 Slope L Q M
Side Slope :1 cs�
Vega Shelf - 10:1 Slope Section View (0.05 ftlft} -� ® cv
Berm to 12.8' Elev. Berm to 12.8 Elev. N.T.S. GO~
Temporary Pool Elev. - 11.6 —Rip i� Pa Wier - Flee. - 1
For b I Permanent Fool Elev. -10.0 i pry C
F
Forebay Dam Elev. 10,0 Filter abric (under Pip Rapp o
Veg. Shelf - 10:1 Slope lF SFOREBAY DETENTION POOLac e Slo - 3:1 OUTLET STRUCTURE DESIGN for 1 Q-YR STORM: " -�
0--.1 f Maximum Discharge rate (1 0-yr. storm) - 79.27 cfs
— — — — — — — _ — - — — — — — — - - — — - - — - — ' - — — — — (767,200'- Drainage Area) '-
i2-- — —_ -- -- — — — -- -- — — -- -- -- -- -- -- — — -- — Vegetative Suffer; --i
_ To property slow and dissipate the 10 yr storm flow.
Vert. Scale: ®tt t Reference: Soil Erosion and Sediment Control Planning and Design Manua!
II _ 0-- -- — — �_ — -- -- -- _ _. 30 min.-
1 =15 9 — — — — — — — — — _ _ — - -- - — — — — — — — — — — — — — — — — — — — — — — Shape of Weir & Outlet is Trapezoidal
t1i
N 7 — — — — — — — — — — — — — — — — — — — — — — — — — - — — — — — — — — — — — — Desired Velocity to be less than 3.5 fps entering into the filter strip
W 5 - -- _- - - --
4. — — — — — - — - _ — _ _ _ — — — — — — — — — — — — — — - - — — — — — — — — — - — - RipRap Size (Dso) = 1Z' , n = 0.078, Table 8.05f, SE&Sed. Manual
0 20 40 60 80 100 120 240 160 180 200 220 240 260 280 300 320 340 velocity at the end of the upper section of the RipRap = 5.53 ftlsec, below the allowed 10.0 for large rock. w�
Stationsft. Velocity at the end of the lower section of the RipRap = 3.35 ftlsec, below the allowed 3.5 for the fitter strip.
{ ) Bottom of Pond - .3° Elev. Sotto of Pond - .3' Elev. Level Spreader
to 2
Horiz. Scale: Sediment Elev. - 43' Sediment Elev. - 4.3'
1 It 1 bI
0
Note: Seasonal High Water Table - 5.8'
Multiple borings were taken at +/ 10' Elev. to determine SHWT
OUTLET PIPE DETAILS W to I=
ti o
LEVEL SPREADER DESIGN: VEGETATION FOR WET DETENTION BASIN: VEGETATION FOR FILTER STRIP: N.T.S.
The Level Spreader will be a concrete curb embedded in the side The following is a list of vegetation that can be included: The following is a list of vegetation that can be included: W w
of the earth. The total len9 th will be at least 13'. No additional a.anchoring will bE; necessary beyond placement in the earth. Turf Grass (Centipede) - along the berms Swamp Milkweed Screw type plug _ DXrE:
Broomsedge -Around the perimeter Sedges orifice outlet Pipe 3/28I08
Concrete/Masonry Support Column DRAWN BY:
Top View 611 Pondweed - Submerged in the basin Swamp lilyWaterweed - Submerged in the basin Pinelands Mallow 6 PVC Piped separately
RAM
2' Common Three -Square - in the basin Spider lily to Level Spreader CHECKED BY:
Invert of Outlet Pipe to be
Marsh Hibiscus - in the basin Seashore Mallow locatedat Permanent Pool MFA
Smartweed - in the basin Joe Weed elevation of 10.0'
A Elevation
_ SC�4LE
Ele anon View Sedges m the basin White Star Grass
�-- — — — — - — — — — — 12" 1$11 Elderberry 1 P11 _ 2 '
- 6 PVC attached to support column
A - --I 2, t�- &„ � Dense Hypericum
i 3" Orfice Hole SHEET NO.
1a' Strap to support column with Stainless
T� 6" Thick Steel 2" wide step and screws
Section A -A

T
The townhome complex will be completed in multiple phases. 421
PHASE 1
- 30 homes within 8 buildings will be constructed. MAGNOUA WATERFOR
- Driftwood Drive and windswept Way roads will be constructed and paved. Shearwater Street will be graded and graveled. GREENS17
= ` L
- The water line will be connected to the existing line and will be laid down these two roads and looped around Shearwater St. 11
�
The sanitary sewer line will be connected to the existing manhole and constructed along these two streets including o U
manholes 1, 2, 3, 6, 7, 8. Project O
� � � —
- The main storm drain line (inlets 1-9) will be contructed all the way down to the stormwater management pond. Location
Side legs within the Phase 1 area will be constructed. 421 w
The stormwater management pond will be constructed and properly planted.
- The retaining walls will not be built during this Phase. A minimum 3:1 slope will be graded at the stormwater pond edge.
- The Construction Entrance will be the same as the Emergency Drive Access during Phase 1
VICINITY
NJS.
The Sediment Trap will become the Wet DetentionBasin.
Remove all the sediment from the Temporary Sediment Trap once the area around the trap is stabilized and
p rY p
bf th 11VtDt t' B dd
1
s
e ®re e e e en aon as�n_os nee e
W"
Existing S.S. Manhole
Area of Disturbance - 18.7 acres V
z Construction Entrance
Silt Fencing N txi 4 s
0 0 � �
l FE.26.5` fi FFE.26.5
l 1 co e
00
'~- _m-_-_---DR1FTW O VE -0 N O
OL
Silt Fencing \ /r // tr \` �-- �� t (1 Q , X
tl
\ ! f
f t FFE.26.5' FFE.26.5' ,,,.--' � i /r' f r'— ,,.--'^ ~\� °\\ \\ ®l�
FFE.26.5` � } .-
1 cc� � N
�Z — \� ems- j/ �� \ \ t \� ! fr fl f f 1 1\ t O
O� � \ i--- 't' /�f r/ \ /� / /r /t f! rr jf? —'/ °�\ \\ N- C)o �� N
! l f / t _ — \ t \ O Cis
\ \
CU o)
SEDIMENT BASIN
FFE.26.5'
�J/ ---._. -�,�
I \ y
FE.26.5 s
FFE.26.5
w` Sitt FenHnn _ f

NOTES:
- The townhome complex will be completed in multiple phases.
PHASE 1
- 30 homeswithin8 buildings will be constructed.
Driftwood Drive and Windswept Way roads will be constructed and paved. Shearwater Street will be graded and graveled.
- The water line will be connected to the existing line and will be laid down these two roads and looped around Shearwater St.
- The sanitary sewer line will be connected to the existing manhole and constructed along these two streets including
manholes 1, 2, 3, 6, 7, 8.
d all down to the stormwater management pond.
The main storm drain line (inlets 1 9) will be contructe a the way do g p
Side legs within the Phase 1 area will be constructed.
The stormwater management pond will be constructed and properly planted.
- The retaining walls will not be built during this Phase. A minimum 3:1 slope will be graded at the stormwater pond edge.
- The Construction Entrance will be the same as the Emergency Drive Access during Phase I
The Sediment Trap will become the Wet Detention Basin.
Remove all t- sediment fromTemporary -• - • once the area around the trap is stabilized and
before the Wet Detention Basin is n- •-•`
PHASE 2
- 46 homes within 13 buildings will be constructed.
- Driftwood Drive will be completed including the 'hammerhead' turnaround.
- The water line will be continued down Driftwood Drive.
- The sanitary sewer line will be continued down Driftwood Drive to include manholes 4 and 5..
- Stormwater side legs within the Phase 2 area will be constructed.
- The retaining wall around the end of Driftwood Drive will be constructed during this phase.
- An agreement will be complete to allow the current owner to taper the slope at the end of Driftwood Drive (at the hammerhead)
off this property using a minimum of 3:1 slope.
- The Construction Entrance will be moved down to the end of Phase I after these roads have been paved.
- Silt Fencing will be moved down to cover the construction area of Phase 11 once the area in Phase I has been stabilized.
Existing S.S. Manhole
of a
* --Area
nStruction Entrance
1
a"� , �. `: •� Silt Fencing
Er-1 E=
�$
S —
`
J fFFE.26.5' FFE.26.5' t� fJ FFE.26.5' f FE.26.0'
t
. \ i ems. .�.— s. ..�� rev— '!- '-•�..... 'e'r...
\4 �, - __ -_ --DRIFfWOQ VE
f tt FFE.26.5' FFE.26.5' r r e FFE.26.5' FFE.26.0' tt ',"-
f F� FE.25` \
FFE.26.5' i q J
1 i J
NO
FFE.26.5' r r
FF€.2 5� �' °l 1
\ / --- 25
FE.26.5'
— i
/ f FFE.26.5 /-
} G FFE.26.5 __� --_
FFE.26.a 4 '
r
` Silt Fencing
r
0
2U
SEDIMENTATION BASIN DETAIL
Sediment Disturbed Trap Volume (Cu.Ft.) Surface Area (Sq.Ft.) Avg.
Basin Area (Acres) Required Design Required Design Depth (Ft.)
1 18.6 66,960 86,240 24,186 35,850 3.2
Q=CiA=0.35x8.54x18.6=55.6cis
Surface Area = cfs x 435 = 55.6 x 435 = 24,186 sq.ft.
During construction, Contractor shalt remove accumulated sediment when it has risen to an elevation
of no more than ha f the capacity. Removed material shall be spread over site and seeded:
m
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0
op
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O,
�
107
MAGNOLIA WATERFORD
GREENS
17
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rn
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VICINITY
N z-P
s acres
--23
\ \
FFE.25.0'
° 4 ! f \ \
FFE.25.5' --- - ''f �\ °\ ° `� ° c 0') 0
Re4 fining Wall \\\ Z3 C1i Ci
00
\ \
2ca
2 ca
IL-
1 FE.25.0' til ��� �. \\ '--_ \` i °\ J�\ !1 .I� �? P-
1
< Z0-)
IN r-- co) C)
ICU
SEDIMENT BASIN
F4
IL/ s e
all_
LLJ
/J� 1 ft� 1f tl Jtt 1' '
-tom .- J
J
Z
O
LU
J J , W
t?
W W
CL 0
DATE:
Y b�' , q� 3/28/08
�b DRAWN BY
RAM
EXISTING CONTOURS
- CHECKED BY:
•- - - - - - - PROPOSED CONTOURS MFA
SCALE:
Silt Fencing ill = 0'
S C A L FE-- 1 60' SHEET NO.
E i
6 ' -30' 07 6 ' 1201 1 ' E M-14 B

T m <k
- The #ownhome complex will be completed in multiple phases. a2 W OD��.. I rn
76 o
PHASE- 1 _
PHASE 2 07-
- 30 homes within 8 buildings will be constructed. - 46 homes within 13 buildings will be constructed. MAGNOLIA WATERFORD -
- Driftwood Drive and Windswept Way roads will be constructed and paved.-Shearwater Street will be graded and graveled. - Driftwood Drive will be completed including the 'hammerhead' turnaround. GREENS
p g around. it
The water line will be connected to the existing line and will be laid down these two roads and looped around Shearwater St. - The water line will be continued down Driftwood Drive. 7W m
- The sanitary sewer line will be connected to the existing manhole and constructed along these two streets including - The sanitary sewer line will be continued down Driftwood Drive to include manholes 4 and 5.. z
U
z
manholes 1, 2, 3, 6, 7, 8. o
- Stormwater side legs within the Phase 2 area will be constructed. Project, o O � o
- The main storm drain line (inlets 1-9) will be contracted all the way down to the stormwater management pond. The retainingwall around the end of Driftwood Drive ' ocation
Side legs within the Phase 1 area will be constructed. e will be constructed during this phase. — a 0
21 w 0 �, _
The stormwater management pond will be constructed and properly planted. a
- An agreement will be complete to allow the current owner to taper the slope at the end of Driftwood Drive {at he hammerhead) U
off this property using a minimum of 3:1 slope. w LL
The retaining walls will not be built during this Phase. ` A minimum 3:1 slope will be graded at the stormwater pond edge. � a
The Construction Entrance will be the same as the Emergency Drive Access during Phase I - The Construction Entrance will be moved down to the end of Phase I after these roads have been paved. -0 cn
- Silt Fencing will be moved down to cover the construction area of Phase Il once the area in Phase l has been stabilized. a)
o -v
:E
PHASE 3 T Q
The Sediment Trap will become the Wet Detention Basin. - 48 homes within 13 buildings will be constructed. NJJ1 ..
- Windswept Way will be completed and Seaspray Lane will be constructed and paved.
Remove all the sediment from the Temporary Sediment Trap once the area around the trapis stabilized and .
- The water line will continue down Windswept Way and looped back around Seaspray Lane. a N
before the et Detention Basinisneeded. - The sanitary sewer line will be completed.
- Stormwater Side legs within the Phase 3 area will be constructed. IN
- All retaining walls will completed during this Phase. cr-
- The Construction Entrance will move interior to the project once the roads of Phase 11 are paved.
- `
Silt Fencing will be removed once the retaining walls have been contructed. `o M �l+�®
a
C y r -Z
Existing S.S. Manhole
4Area of Disturbance - 18.7acres
l , . Construction Entrance
2 Silt Fencing e.a
00,
LLJ
1J J\\ �-�3:1 Slo
J FFE.26.5' � FFE.26.5' } J FFE.26.5'� ` � l FFE.25.0' � ,�` � � � \ \ � CS�7
f
ffi ! t 1 FFE.25.5' \� 4
J � f ....__ —.-- _-__• / -.----_..,� r--.._._. FFE;25.5 .�.. - r \ �' � A
-_-
1 rr \ i' _ \ -__... / Retaining Wail \ \ \ '"-t 00 1- 1
/ t r - ! / \ \ \ Ret ining wall - N O
J ` j FFE.26.5' FFE.26.5' FFE.26.5' FFE.26.0' / '"- --CU
LL
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SEDIMENTATIONf z r / }-
BAS(N DETAIL �! l r �! ;e / v ` -a.
Sediment Disturbed Trap Volume(Cu.Ft.) Surface Area (Sq.Ft.) Avg.
Basin Area (J - J J !/ f e e e Cl)
[acres} Required Design Required Design Depth (Ft.) g O__ ! /
' 1 18.6 66,960 86,240 24,186 35,850 3.2 t J ', J
i
�JL / Regaining Wall t DATE:
Q = CIA =0.35x8.;4x18.6=55.6cfs Rt
�� 3:1 Slop / t /L 28Q/ V/
'Y � 1 t
Surface Area.= cfs x 435 = 55.6 x 435 =.24,186 sq.ft. v DRAWN BY:
RAM
During construction, Contractor shall remove accumulated sediment when it has risen to an elevation
of no more than half the capacity. Removed material shag be spread over site and seeded. EXISTING CONTOURS CHECKED BY:
..,.-----_-- PROPOSED CONTOURS
FA
SCALE:
0 0 0 - Silt Fencing 60o
.
-�
l
SHEET NO.
6 ' 0' 0" 60' 120' ? 80' ER-1

W
CO
W co
a
EROSIONT L T oQ
Existing Asphalt Road
1. Erosion and sedimentation control devices and structures shall be installed maintained
t ,
and amended as needed to provide effective control of accelerated erosion and
sedimentation until the contrubuting watersheds are completerly stabilized. m
z'
4s" nnax. TOTAL DISTURBED ACRES: 18.6 O o o
19 ga. hardware cloth, i� �� Proposed
(IX'mesh) Construction W R S-
Entrance 2. Construction Sequencer
a. Notify Engineer, Owner, and Land Quality Section prior to beginning. construction. can j
W!
b. Clear and grub areas as needed for construction. o
24" gin. c. Dig Sediment Trap, Construct Wier, place Silt Fencing and Rock Check Dams as noted on plans. '
d. Create road bed and road swages.
e. Maintain erosion and sedimentation control measures as needed to assure full Q '
functionability. Inspect and repair after each rainfall event. ;
f. Once roadway, buildingpads and surrounding areas have been constructed, immediately
,
24" in. prepare the soil for seed as noted below. Provide round cover for all disturbed areas
NTS
STABILIZED CONSTRUCTION ENTRANCE p P 9 o �
� ) within 15 days o€ completing an radio work. Install temporary filter fabric to all swages z
Y p g Y grading p rY
#57 Cleaned Stone
and ditch sides when mulch will not hold. or NCDOT #5 1. Stone Size. #2 (1.5" - 2.5") cleaned stone
2. Length to be a minimum of 50 feet. Width to be a minimum of 12 feet. 3. Once all areas have been stabilized, Contractor is to remove temporary erosion control
. fE measures, regrade, apply permanent seeding along with specified fertilizer and mulch. .`® m �' - X
Thickness.. 5 minimum
WS
. 4 z-
N-
3. When necessary,wheels of construction vehicles are to be washed before � �' V o
� .
Silt Fence _..
entering onto public roads. Washing to be done on an area stabilized with
cleaned stone (6 in thickness) that drains into the sediment basin. PERMANENT SEEDING SCHEDULE
HHHHUHU 4. The entrance shall be maintained to prevent tracking or flowing into public
HHHHHHUHH right-of-ways. Top dress stone as necessary. Permanent Seeding Mixture wr/ Nurse Crop
N-11SPECIES RATE (LBJACRE) DATE 11
German Millet 30 April 15 July 1
Annual Rye Grain 40 July 1 - April 15
Common Bermuda (Hulled) 50 April 15 - July 1
a
Common Bermudanhull 60 January 1 March 1 COoO
(U ed) ry M M
INLET (
NTT CO
®- � N o
Temporary Seeding Mixture - ® �-
�
<i Cr ,
Once inlet is constructed install silt fencing around inlet as �
SPECIES RATE LB./ACRE DATE W = x
noted_ in silt fencing '
detail. seed &Mulch ( a ®ca
German Millet 120 May -1 - August 25 —
Compacted Soil Y g � �
�,,� U o
after Rakingsurface 2:1 Slope, max Annual Rye , ..Grain 150 _ August 25 - May 1 EL
2 Min. ( ) g Y i L_ r-
Y ��
-Temporary seed mix shall be used for all areas exposed r r L
`- NOTE, p rygreater than one week and < -
_j-11( 11511 -j ��� { subject to further disturbance. Permanent seed mix shall be checked for adequacy. ro
-1 I �) _ � T-
=i 1(_� ( �_� i i=� i=) (=) t Adequate cover shall have 30 sprigs o€ Bermuda per one square foot. r-
2' sw 11
.:
'-o" Min. - 0„ Min. O
SOIL ADMENDMENTS TILLED T ( O 6 DEPTH PRIOR TOSEEDING)
A l Agricultural Limestone -1 ton/acre
Pp Y g - -�
` N.T.S. _ DO
Wire Fencing & Apply fertilizer at a rate of 1,000 lb./acre (10-10-10) RINI
Filter Fabric
Mulch
Steel post or DOT approved T-Bar
8' o.C. #wire Mulch -1 to 2 tons/acre - small grain straw or equivalent cover.
s O.C. x-tra strength, w/o wire Anchor -_As halt emulsion on slopes when mulch is not sufficient at 430 al./acre a RS . LLI
p P _ { ) _ 9 (type }
Compacted Mulch anchoring tool shall be used on all other areas.
Backfill In
Maintenance
r
Refertilize in the second year unless growth is full adequate. Mow to 3 inch height when
Y 9 Y q 9
18.._ Z4 average height of grass becomes5.: inches. Reseed, apply soil amendments and .mulch LLJJ
i
damaged or dead areas immediately.
....�.. ti; -
A
� 8" Mtn.
try
UJ
Qn# ,q
mil"
•.-c-a
24" in.
Class B RipRap, ftaN width of swage L
Z'
Extend Fabric and O
Wire 8" deep#57 Cleaned Stone F
� �---21 Min U �
4" forward into Trench min. 12" thick, 2:1 Slope
{--4, Min--� W U
C3 - u?
Qi W W
__
- - --- ----1------- ----- .a - - -- - -- -- -- - -V- - -r---- ----.1 �-
undermining immediately. 1.5' min
2. Contractors option to use at toe Of slopes adjacent to pavement CHECKED BY:
p P 1 P Cross -Section View 'Face of Flow' View
to protect paved surfaces.
N.T.S. N.T.S. MFA
SCALE:
SEDIMENT BASIN WEIR No Scale
SHEET N
((ROCK
CHECK NO.
ER-2
DESIGNSAME I