20110749 Ver 1_More Info Received_20111012

Oro
cPC.) dfe c1 K'?
1?,?? ?eecl I4? ?c
p(-6ase ( roCe5s
lPZ?//
(O Lt"
c???s
3CO
AWmA
NCDENR
Project name
Contact name
Phone number
Date
Drainage area number
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER - VEGETATED FILTER STRIP (LS-VFS) SUPPLEMENT
This form must be completely filled out, printed, initialed, and submitted.
IJ. DESIGN INFORMATION
The purpose of the LS-VFS
Stormwater enters LS-VFS from
Type of VFS
Explanation of any "Other" responses above
If Stormwater Enters the LS-VFS from the Drainage Area
Drainage area
Impervious surface area
Percent impervious
Rational C coefficient
Peak flow from the 1 in/hr storm
Time of concentration
Rainfall intensity, 10-yr storm
Peak flow from the 10-yr storm
Design storm
Maximum amount of flow directed to the LS-VFS
Is a flow bypass system going to be used?
Explanation of any "Other" responses above
If Stormwater Enters the LS-VFS from a BMP
Type of BMP
Peak discharge from the BMP during the design storm
Peak discharge from the BMP during the 10-year storm
Maximum capacity of a 100-foot long LS-VFS
Peak flow directed to the LS-VFS
Is a flow bypass system going to be used?
Explanation of any "Other" responses above
LS-VFS Design
Forebay surface area
Depth of forebay at stormwater entry point
Depth of forebay at stormwater exit point
Feet of level lip needed per cfs
Computed minimum length of the level lip needed
Length of hvel lip provided
o?OF WATF9QG
y r
8
Dogwood
Kevin Varnell
252.459.8196
June 20, 2011
3
Buffer Rule: Diffuse Flow
The drainage area
Engineered filter strip (graded & sodded, slope < 8%)
70,132 ftz
41,818 ftz
59.63 %
0.68
1.09 cfs
5.00 min
7.38 in/hr
8.04 cfs
1 inch/hour storm
1.09 cfs
Y (Y or
Pick one:
Do not complete this section of the form.
cfs
cfs Do not complete this section of the form.
10 cfs
cfs Do not complete this section of the form.
(Y or N)
0 sq ft
0 in
0 in
10 ft/cfs
11 ft
12 ft
Porebay is undersized.
Too shallow.
Too shallow.
Form SW401 !.S VF-1 29Nov2010 - R( .a
page 1 of 3
Width of VFS
Elevation at downslope base of level lip
Elevation at the end of the VFS that is farthest from the LS
Slope (from level lip to the end of the VFS)
Are any draws present in the VFS?
Is there a collector swale at the end of the VFS?
Bypass System Design (if applicable)
Is a bypass system provided?
Is there an engineered flow splitting device?
Dimensions of the channel (see diagram below):
M
B
W
y (flow depth for 10-year storm)
freeboard (during the 10-year storm)
Peak velocity in the channel during the 10-yr storm
Channel lining material
Does the bypass discharge through a wetland?
Does the channel enter the stream at an angle?
Explanation of any "Other" responses above
30 ft
278.50 fmsl
276.10 fmsl
8.00 %
N (Y or N) OK
N (Y or N)
Y (Y or N)
Y (Y or N) Please provide plan details of flow splitter & supporting calcs.
ft
ft
ft
ft
ft
fVsec
Pick one:
N (Y or N)
Y (Y or N)
A Piped Bypass will be utiltized with Outlet Protection prior to entering the stream.

B 1
Jill. REQUIRED ITEMS CHECKLIST
EDIT Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will result in
a request for additional information. This will delay final review and approval of the project. Initial in the space provided to indicate the following
design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a requirement has not been met, attach
justification.
Requried Item:
1. Plans (1" - 50' or larger) of the entire site showing:
- Design at ultimate build-out,
- Off-site_drainaae (if aoolicable).
Delineated drainage basins (include Rational C coefficient per basin),
Foreba;, (if applicable),
High flow bypass system,
Maintenance access,
Proposed drainage easement and public right of way (ROW), and
Boundaries of drainage easement.
Initials Page or plan sheet number and any notes:
C-1,D-2
Fort SW401 - LS-VF : - 29Nc 1010 - Rev.8 pa-e 2 of

2. Plan details (1" = 30' or larger) for the level spreader showing:
Forebay (if applicable),
High flow bypass system,
One foot topo lines between the level lip and top of stream bank,
Proposed drainage easement, and
Design at ultimate build-out.
3. Section view of the level spreader (1" = 20' or larger) showing:
- Underdrain system (if applicable),
Level lip,
Upslope channel, and
Downslope filter fabric.
4. Plan details of the flow splitting device and supporting calculations (if applicable).
5. A construction sequence that shows how the level spreader will be protected from
sediment until the entire drainage area is stabilized.
6. If a non-engineered VFS is being used, then provide a photograph of the VFS showing
that no draws are present.
7. The supporting calculations.
8. A copy of the signed and notarized operation and maintenance (0&M) agreement.
J D-2

_ C-4
D-2
D-1

Engineered is being used.
See Calculations

See 0 and M Agreement

Form N401 - :-VFS - 29Nov2 10 Re 3
page 3 of 3

A ,,I A ?F W ATF9

r
YS
NCDENR ? y
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER - VEGETATED FILTER STRIP (LS-VFS) SUPPLEMENT
This form must be completely filled out, printed, initialed, and submitted.
I. PROJECT INFORMATION
Project name Dogwood
Contact name Kevin Varnell
Phone number 252.459.8196
Date June 20, 2011
Drainage area number 4
Ill. DESIGN INFORMATION
The purpose of the LS-VFS Buffer Rule: Diffuse Flow
Stormwater enters LS-VFS from The drainage area
Type of VFS Engineered filter strip (graded & sodded, slope < 8%)
Explanation of any "Other" responses above
If Stormwater Enters the LS-VFS from the Drainage Area
Drainage area 192,535 ftz
Impervious surface area 85,813 ft,
Percent impervious 44.57 %
Rational C coefficient 0.59
Peak flow from the 1 in/hr storm 2.59 cfs
Time of concentration 5.00 min
Rainfall intensity, 10-yr storm 7.38 in/hr
Peak flow from the 10-yr storm 19.11 cfs
Design storm 1 inch/hour storm
Maximum amount of flow directed to the LS-VFS 2.59 cfs
Is a flow bypass system going to be used? Y (Y or N)
Explanation of any "Other" responses above
If Stormwater Enters the LS-VFS from a BMP Do not complete this section of the form.
Type of BMP Pick one:
Peak discharge from the BMP during the design storm cfs
Peak discharge from the BMP during the 10-year storm cfs Do not complete this section of the form.
Maximum capacity of a 100-foot long LS-VFS 10 cfs
Peak flow directed to the LS-VFS cfs Do not complete this section of the form.
Is a flow bypass system going to be used? (Y or N)
Explanation of any "Other" responses above
LS-VFS Design
Forebay surface area 0 sq ft Fo ebay is undersized.
Depth of forebay at stormwater entry point 0 in Teo shallow.
Depth of forebay at stormwater exit point 0 in Too shallow.
Feet of level lip needed per cfs 10 ft/cfs
Computed minimum length of the level lip needed 26 ft
Length of level lip provided 28 ft
Form SW401 -1 S-VFS - .8Nov201o - Re,. 3 rage , of 3
Width of VFS
Elevation at downslope base of level lip
Elevation at the end of the VFS that is farthest from the LS
Slope (from level lip to the end of the VFS)
Are any draws present in the VFS?
Is there a collector swale at the end of the VFS?
Bypass System Design (if applicable)
Is a bypass system provided?
Is there an engineered flow splitting device?
Dimensions of the channel (see diagram below):
M
B
W
y (flow depth for 10-year storm)
freeboard (during the 10-year storm)
Peak velocity in the channel during the 10-yr storm
Channel lining material
Does the bypass discharge through a wetland?
Does the channel enter the stream at an angle?
Explanation of any "Other" responses above
30 ft
283.70 fmsl
282.40 fmsl
4.33 %
N (Y or N)
N (Y or N)
Y (Y or N)
Y (Y or N)
ft
ft
ft
ft
ft
ft/sec
MCK one:
OK
Please provide plan details of flow splitter & supporting calcs.
N (Y or N)
Y (Y or N)
A Piped Bypass System will be Utiltized with Outlet Protection prior to Entering the Stream.
W
1 B 1
III. REQUIRED ITEMS CHECKLIST
EDIT Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will result in
a request for additional information. This will delay final review and approval of the project. Initial in the space provided to indicate the following
design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a requirement has not been met, attach
justification.
Requried Item:
1. Plans (1" - 50' or larger) of the entire site showing:
- Design at ultimate build-out,
Off-site drainage (if applicable)
Delineated drainage basins (include Rational C coefficient per basin),
Forebay (if applicable),
High flow bypass system,
Maintenance access,
Proposed drainage easement and public right of way (ROW), and
Boundaries of drainage easement.
Foi n S :401 - LS-VFS - ^gNovT '0 - Rev.8 page ^ of s
2. Plan details (1" = 30' or larger) for the level spreader showing:
- Forebay (if applicable),
High flow bypass system,
One foot topo lines between the level lip and top of stream bank,
Proposed drainage easement, and
Design at ultimate build-out.
3. Section view of the level spreader (1" = 20' or larger) showing:
- Underdrain system (if applicable),
Level lip,
Upslope channel, and
Downslope filter fabric.
4. Plan details of the flow splitting device and supporting calculations (if applicable).
5. A construction sequence that shows how the level spreader will be protected from
sediment until the entire drainage area is stabilized.
6. If a non-engineered VFS is being used, then provide a photograph of the VFS showing
that no draws are present.
7. The supporting calculations.
8. A copy of the signed and notarized operation and maintenance (0&M) agreement.
©?'? D-2

21? D-2

D-2
lyj D-1

Q
/ Engineered is being used.
S
L See Calculations

See 0 and M Agreement

Form SV'40 ; - L.` ?FS - 29Nov2C' , - Rev
page 3 of 3
o W
;.a Z J.B. #2 ~ °
P..~_ r-- , ~ ~....r~ \ \ ~ I TOP (272.52
~ / INV. 1N 268.63. J w
~ \ r ~ \ ~ ~ ~ ~ ~ INV. OUT (15") 268.53 a U
~ - \ , ~ ~ , - , ~ / INV. OUT (30").269.82 z ~ ~ N /1 ~ O W
_ _ .r \
/ y' I ~ til 2 > ' A~ ~
//1//
~ / ~ r \ r
\ _ a
f A i ~ - ~ ~ / - - r ~ / ~ - . 4' DIA. CONC. MH
/ ~ ~ ~ ~ ZONE 1 MPACF~ 0 0
w ~ ~ ; : , ~ ~2 INV• FES ti,S' r--~'.~ , ' / , . ~ Q-- 789 SF ~ ~ \ ~ ~ \ T - ~ f272.5c N O ti ti H
% /r i ~ / r--' 260.00 J N 15" RCP
- ~ / / ~ IDS . ~l T 15 ~Fu.~~3 ~ \ . ,
~ ~ / ~ ( ~ Nw OUT- 30 269,82-- - ~ i C~~ CR SPREADER) 30" RCP w z EEK (TO BYPASS CHANNEL) ~ a ~ ~ ~ ~
~ ~ / r - ~ 1" WSE
,N ~ r 6x30 i _ 30 CP'~
~ ~C r N; ~ r r ~ .9,31.,.\-_ i f ~ , ~ ~ I~ ~ F= ~"ES ZONE 2~IM, PA. , ~ ~ L ~hEL SP AD R 30" RCP
40 ~ ~ i ~ fir.- i, 49~~f
/ / ~ ~ ~ ~ A___- 1~ : ~ ~
i ~ /
,r ~ LEVEL .SPREADER 2
TURN. NUESE RIVE, ~ ~ ~ ' ;y / ? , ~ - ~R 2 FLOW SPLITTER STRUCTURE
~ ~ ! C~ ~ ~ ~ ~ 40x30 / I`~ ,d ~ , LEVEL SPREADS , SCALE: N.T.S:
PKWY. DITCH INTO ~ i ~ _ LEVEL SPREADER 2
~ ~ ~ !P ELEV. 268'5 PLUGDITCH TO AV010 ~ ~ r j~ ~ ~ ~ ' D _ 2 ~ ~d.
l r ~ V ' r C ~ NV. FE~ 3 BYPASS ~ ~ ~ ~ ; / ,,r' r._
s ~ ~ \ / ~ 2 50
l ~ ~ _ y f ~ ~ i ~ r ~ CJ / f,, ~ ~ q r
C~~ , V ~ ~ Q/ Ai ~ ~ ~ i
i r ~ , ~ ~ l ~ C.B. #19
/ ' ~ i ~ ' ~ ~1 ! ~ ~ ~ _ r 1 TOP.. (284.37
V \ / ~i ,i 1 / INV. IN 280.60 i INV. OUT (8") 279.27
F .l l 27 ~ i ~ j` INV. OUT (18") 280,52
~ ~
i ~ ~ ~ r I ~ i /
r ti,. ft ~ ~ ti I l ~ , A~ / 'fir , / ~
1~7~~. l t ti \ 1 1 I ~ ~.e! ~ ~ , -=r~_~ - -
4' DIA. CONC. MH
ER 2 VEL SPREADER 1 LEVEL SPREAD LE
' » 3
SCALE: 1 =30 SCALE: 1 =30
~ ~ - 8.. PE (TO LEVEL 18" RCP
~ ~ SPREADER)
W ~ 9 ~ ~ - ~ \ (TO BYPASS CHANNEL) _ i" WSE
\ \ ~ 18" RCP
/ w \ ~ ~ .
\ e
\ ~ ~ - i . 1
v' ' ~ ~i Z~ NE 1 IMPACT . _ ~..n._.__ ~ I Qr )
. ~ µ_,_..______7r.___ . ~ 6 7 SF V
~R ~ ~ - ONE2 IMPACT E ~ _ K i I LEVEL SPREADER 3
1 ~ ~ ZONE 1 IMPACT - 770 SF 3 FLOW SPLITTER STRUCTURE
,i~
\ w~-~`' INV.-FES 18 /271.0 . - ~ D-2 SCALE: N.T.S. i~~ "
..rv---------- ~ ~ ~ _ w ~ \ . - \ ~ 28x30' ~.,r
. / _ ` 7 _ ~ ~ ,,W ZONE 2 IMPACT LEVEL S"PREA E 290 _ . _ _
~ QR RG1~ ~ 12.21.E ; 2 ~ 451 SF INV. FES 23 _ .11R ELEV. 283.70 ~ 2 ®292
W 6.~FES Q~ ti ~.u.- ;/2 279.00 /
~r caM /
68 LF 18 ` , ` r~... ~ 8 0 J.B. #24
~ - ~ / a~ RCP- ° .65~ ~ ...z~ w 'h ~ _v N. ~ ~ r o 7 , TOP 1288.20
_ , ~ W 6' FES ' ; ~ _ , ~ INV. 1N 284, 05
~ , 12x30 ~ `~I ~ 3P ~ ~ ~ S , INV. OfIT (12") 284.00
` 9 ..---~'ZE~EI SPREADER o .,..277 _r ~ - - - - \ B• , F g7~ - ti INV. OUT (18") 285.40
~ ~'N ° L-IP--ELf l~- ~78~ 50._ .r _a..._- ~ `~5c3_-_~°df~'ESE. RUFF€R--- - -,T~iP 1288.20 ~ _~8
v' v ~ _,5F-tr 8 ~1NV. IN 24.05--- 2~ f. PVC ®-_Z.~,~~r A9 ~11~~. OUT (12) 284.00 _ 1
. _ a n_ c...1 t, y ry , INV. 8" 18A - _._"'p ~ - ~..,/INV. DUT 285,.40 4' DIA. ~t / CONC. MH
/ ~ _ ,
278 ~ !tad. ~ _ _ ~:r,,,,e - A - o' ~ -v
i` C' 80 ~ -289 ' 6'
~ / , r-- 12" RCP ! ~ (TO LEVEL 18" RCP '
------J . ~ ~ ®f SPREADER) (TO BYPASS CHANNEL)
r A~ ~ _ , ; 1.. WSE. '
Y r 24" RCP
_ ~ r I ~ - ~ ~ 1. J ~ ~ ~ , J ~ 6~~
0
f ~ / m
1 ~ i i / ~ ~
LEVEL SPREADER 4
4 FLOW SPLITTER STRUCTURE ~~M
DER 3 LEVEL. SPREA LEVEL SPREADER 4 m°
, 2 SCALE: N.T.S. N ~ N ~n,.,~
SCALE: 1 =30 SCALE: 1 =30 ~N~
wyW
VEGETATED FILTER S RIP NOTES T #57 STONE ON LEVEL SPREADER CONSTRUCTION SEQUENCE =do
FILTER FABRIC
P R THE SOILS PROPERLY AND. 1. FOR AN EFFECTIVE VFS, IT IS ESSENTIAL TO PRE A E AND. 1. IMMEDIATELY BEFORE, BEGINNING CONSTRUCTION. CONTACT ENGINEER TO VERIFY.
° ° . , . MAINTAIN A DENSE VIGOROUS STAND OF TURF. THAT THE PROPOSED GROUND CONTOURS ARE APPROX. PARALLEL TO THE LS
CONCRETELEVEL : sPREaoERUP 2. THE SIDE SLOPES CREATED BY ANY GRADING SHOULD RECEIVE THE SAME. ATTENTION TTENTION LOCATION CALLED FOR ON THE PLANS.
#57`STONE ON T F
6~ a FILTER FABRIC ° . , . ° , 0 SOILS AND VEGETATION AS THE V S REINFORCED FILTER STRIP PERFECTLY 2. USING A SMALL EXCAVATOR, CONSTRUCT THE BLIND SWALE.
CHANNEL °d ~ LEVEL FROM ONE SIDE TO 3. AT A MINIMUM THE VFS AND ANY SIDE SLOPES SHOULD BE COVERED WITH SIX . THE OTHER a SIX 3. BEGIN CONSTRUCTION OF LEVEL SPREADER ON UNDISTURBED SOIL IF .POSSIBLE.
° , INCHES OF TOPSOIL. 16~~ 3 x ' 30' IF CONSTRUCTED ON FILL,. COMPACT. TO 95~ STANDARD PROCTOR. CONCRETE
.°.°.•.°.FILTER+°.°.•.°.°. 4. A ONE-TIME FERTILIZER APPLICATION TO THE TOPSOIL SHOULD BE PLACED AT A RATE ! ~ N w ~ STRIP.. . AT A RATE FORMS SHALL BE APPROX. 3" HIGHER THAN THE' DOWNSLOPE GROUND TO ~,,~~`'"I~CARO~~''%
OF 75 LBS 1000 SF AGRICULTURAL GRADE LIME AND 50 LBS/1000 SF OF 5/10/10. / ~/10/1Q ALLOW FOR DIFFUSE FLOW. POUR CONCRETE TO TOP OF FORMS. ENSURE LIP e~,
r 5/ ' . CLASS.B (FESCUE SOD) 0 ~ESSIp' .f, wco IS PERFECTLY LEVEL. LET CONCRETE SET OVERNIGHT AND REMOVE FORMS, c~.;°Q~° N9f••y z~
REINFORCED ~ FERTILIZER. ~--z A . A . CHA"NEL 5. FESCUE SOD SHALL BE PLACED PER DETAIL.
22 DEEP ~ • 4. BEGIN BACKFILLING AROUND LEVEL SPREADER AND: REINFORCE THE CHANNEL. SEAL Q"
ENSURE WATER WILL ENTER BLIND SWALE AND FLOW ACROSS LEVEL LIP WITHOUT ~ 19843 z~
SECTION FESCUE SOD WATERING REQUIREMENTS BYPASSING ON BOTH ENDS. :,w ••.FN~iNEEE~.•: h`,,` ~z
5. INSTALL FLOW SPLITTER.. ~°~~~~~NAEIS~~.~ ~-~-2oi~ NwJ
iaici ~ ,nin -rrn c~nn n ~rnv n z n n vc^ nrnrninrniT t innni -rr~nnro n Ti i~r Tr...., ir. -r. nii . i i rir. r~ innrr~ n nr n n n in.rni n ri rv i innr.innn nni rrinn~ ~'~Qllwu~i11111A 0 . 'Q C
I. VVH IGF\ 3\,)U EVE F\ I L-U UM I D UC.rLINUCIV 1 Ur VIN IGVif I-f1/11V(lE. SPREADER b. SttU, J I KAW HIVU I HLK ALL UI~ I UKtitU HKtHZ:) IIVINItUIH I Lt T UrUIV UUIVIt Lt I IUIV. 57/_ _ 6 r
1- - DWQ LEVEL SPREADER DETAIL LIP 2. ATLEAST 2 INCHES OF WATER SHALL BE APPLIED DURING WATERING. Lolf- OQ Z
r
D-2 SCALE. • N. T. S. 2. ONCE SOD IS WELL ROOTED WATER AS NECESSARY TO MAINTAIN. SCALE: 1 30'
0 30 60 75 90 Dmz