20070295 Ver 4_More Info Received_20140627

The John R McAdams
Company, Inc
Raleigh / Durham, NC
2905 Meridian Parkway
Durham North Carolina 27713
(919) 361 -5000
Charlotte, NC
11301 Carmel Commons Blvd,
Suite 111
Charlotte North Carolina 28226
(704) 527 -0800
June 25, 2014
1Y
3014 %7201,
Mr. Danny Smith
NCDENR
Wetlands, Buffers, Stormwater — Compliance Permitting Unit
1650 Mail Service Center
Raleigh, North Carolina 27699 -1650
Re. South Lake at Holding Village — Buffer Approval
DWR #: 07- 0295v4
Response to ls"' Review Comments
RAP -13020
The following are the response comments for the above mentioned project.
Our response comments are in bold.
WATER QUALITY REGION OPERATIONS Danny Smith
1. A detail view of level spreader F, splitter box, and bypass channel must be
provided as well as the drainage area collection structure on level spreader
detail sheet (SW -LS 1).
McAdams Response: A detail sheet for level spreader F has been
provided. Level spreader F has been sized and designed to include
future development.
2. A supplement form must be provided for level spreader F.
McAdams Response: A supplement form for level spreader F has
been provided.
3. If the slope in the riparian buffer exceeds 5% or the 1 in/hr storm from the
drainage area exceeds 2 cfs, then a LS may not be used adjacent to the
buffer. Instead of diffuse flow, a BMP that removes at least 30% TN and
30% TP must be provided. This comment applies to level spreaders D and
E.
McAdams Response: Per telephone call with Cory Larsen on June 20,
2014, this comment is no longer applicable to the level spreaders.
4. Supplement forms must be fully completed including the Bypass System
Design section. Peak velocity in the channel for the 10 -yr storm must be
provided as well as calculations demonstrating non - erosive flow through
the buffer.
McAdamsCocem Designing Tomorrow's Infrastructure & Communities

J McADAM.S
June 25, 2014
Mr. Danny Smith
NCDENR
Wetlands, Buffers, Stormwater — Compliance Permitting Unit
1650 Mail Service Center
Raleigh, North Carolina 27699 -1650
Re: South Lake at Holding Village — Buffer Approval
DWR #: 07- 0295v4
Response to 1St Review Comments
RAP -13020
The following are the response comments for the above mentioned project.
Our response comments are in bold.
WATER QUALITY REGION OPERATIONS Danny Smith
1. A detail view of level spreader F, splitter box, and bypass channel must be
provided as well as the drainage area collection structure on level spreader
detail sheet (SW-LS I).
McAdams Response: A detail sheet for level spreader F has been
provided. Level spreader F has been sized and designed to include
future development.
2. A supplement form must be provided for level spreader F.
McAdams Response: A supplement form for level spreader F has
been provided.
3. If the slope in the riparian buffer exceeds 5% or the 1 in/hr storm from the
drainage area exceeds 2 cfs, then a LS may not be used adjacent to the
buffer. Instead of diffuse flow, a BMP that removes at least 30% TN and
The John R. McAdams 30% TP must be provided. This comment applies to level spreaders D and
Company, Inc. E
Raleigh / Durham, NC McAdams Response: Per telephone call with Cory Larsen on June 20,
2905 Meridian Parkway 2014, this comment is no longer applicable to the level spreaders.
Durham, North Carolina 27713
(919) 361 -5000 4. Supplement forms must be fully completed including the Bypass System
Design section. Peak velocity in the channel for the 10 -yr storm must be
Charlotte, NC provided as well as calculations demonstrating non - erosive flow through
11301 Carmel Commons Blvd, the buffer.
Suite 111
Charlotte North Carolina 28226
(704) 527 -0800
McAdamsCo.com Designing Tomorrow's Infrastructure & Communities

�J McADAMS
Mr. Danny Smith
South Lake at Holding Village
June 25, 2014
Page 2 of 3
McAdams Response: Completed supplement forms for all level
spreaders have been provided. Bypass systems for level spreaders A,
B, and C utilize the ponds for detention and outlet to the riprap
velocity dissipaters designed for the ponds. Therefore, "Bypass
System Design" section of the supplement form is not applicable for
these level spreaders. The velocity dissipater design calculations have
been included.
Calculations for level spreaders A, B, and C were not provided. Please
provide calculations supporting the 10 -year peak discharge rate for each
BMP that discharges to a LS -VFS and bypass invert elevations.
McAdams Response: The orifice in the outlet structure to the level
spreader for each BMP was sized such that during the 10 year storm
event, the peak water surface elevation in the pond provided the
driving head required to push approximately 10 cfs through the
orifice. Please see the pond routing calculations for peak water
surface elevations and outlet structure stage- discharge tables for
corresponding outlet flowrates.
6. Please provide bypass outlet structure design details for each BMP with
discharge to LS -VFS (dimensions, invert elevations, type, etc) on the level
spreader detail sheet (SW -LS 1)
McAdams Response: Construction drawings for the bypass outlet
structures have been provided. See sheet SW -LS4.
RAP -13020

J McADAMS
Mr. Danny Smith
South Lake at Holding Village
June 25, 2014
Page 3 of 3
Consideration of this response is greatly appreciated. If you should have any
questions or require additional information, please do not hesitate to contact
me at (919) 361 -5000.
Sincerely,
THE JOHN R. McADAMS COMPANY, INC.
Kevin Yates
Project Manager, Water Resources & Infrastructure
KY /md
J h Shinn, EI
Designer II, Water Resources & Infrastructure
RAP -13020

J
MCADAIv1s
LETTER OF TRANSMITTAL
To: Mr. Danny Smith Date:
Wetlands, Buffers, Stormwater - Compliance
Permitting Unit
1650 Mail Service Center
Raleigh, North Carolina 27699 -1650
Re: Holding Village Job No
South Lake Subdivision - Phases 1 -3
1 am sending you the following item(s):
June 25, 2014
** HAND DELIVER **
RAP -13020
COPIES
DATE
NO.
DESCRIPTION
4
For review and comment
Level Spreader Design
4 Sets
Construction Drawings
1
Response to Comments
1
Digital Copy
These are transmitted as checked below:
❑
As requested
❑
For approval
❑
For review and comment
Remarks:
Copy to:
❑ For your use
l�1
Signed:
K'e in Yates
[ oject Manager, Water
Resources and Infrastructure
Raleigh - Durham Charlotte
2905 Meridian Parkway 11301 Carmel Commons Blvd., Suite 111
Durham, North Carolina 27713 Charlotte, North Carolina
(919) 361 -5000 (704) 527 -0800
Designing Tomorrow's Infrastructure & Communities
McAdamsCo.com

LEVEL SPREADER DESIGN
SOUTH LAKE AT HOLDING VILLAGE
. ' 31=1
a TIM
WAKE FOREST, NORTH CAROLINA
DATE: JUNE 2014
PREPARED FOR:
WSR HV, LLC
C/O READING & PARTNERS, LLC
8480 HONEYCUTT ROAD, SUITE 200
RALEIGH, NORTH CAROLINA 27615
McADAMS
Raleigh /Durham ■ 2905 Meridian Parkway ■ Durham, NC 27713
Charlotte ■ 11301 Carmel Commons Blvd ■ Suite 111 ■ Charlotte, NC 28226
McAdamsCo.com
Designing Tomorrow's Infrastructure & Communities

SOUTH LAKE AT
HOLDING VILLAGE
WAKE FOREST, NORTH CAROLINA
LEVEL SPREADER DESIGN
PROJECT NUMBER:
DESIGNED BY:
DATE:
a[
RAP -13020
KEVIN YATES
NOSH SHINN, EI
JUNE 2014
McADAM S
2905 MERIDIAN PARKWAY
DURHAM, NORTH CAROLINA 27713
NC Lic. # C -0293

LEVEL SPREADER 'A'
LEVEL SPREADER 'B'
LEVEL SPREADER 'C'
LEVEL SPREADER 'D'
LEVEL SPREADER 'E'
LEVEL SPREADER 'F'
DETAIL SHEETS

LEVEL SPREADER `A '
SOUTH LAKE AT HOLDING VILLAGE
RAP-13020

A6,1AIF
0 %
NCDENR
P 'yc
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
Holding Village
Contact name
Kevin Yates
Phone number
919 - 361 -5000
Date
June 24, 2014
Drainage area number
Sub 1 to SWMF'A'
Ill. DESIGN INFORMATION
The purpose of the LS -VFS
SW Rule: !0 -year drawdown from Wet Pond
Stormwater enters LS -VFS from
A BMP
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
fe Do not complete this section of the form.
Impervious surface area
ff Do not complete this section of the form.
Percent impervious
% Do not complete this section of the form.
Rational C coefficient
Do not complete this section of the form.
Peak flow from the 1 in /hr storm
cfs Do not complete this section of the form.
Time of concentration
min Do not complete this section of the form.
Rainfall intensity, 10 -yr storm
in /hr Do not complete this section of the form.
Peak flow from the 10 -yr storm
cfs Do not complete this section of the form.
Design storm
Maximum amount of 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) Do not complete this section of the form.
Explanation of any "Other" responses above
If Stormwater Enters the LS -VFS from a BMP
Type of BMP
Other: Explained below
Peak discharge from the BMP during the design storm
15.59 cfs
Peak discharge from the BMP during the 10 -year storm
15.59 cfs
Maximum capacity of a 100 -foot long LS -VFS
10 cfs
Peak flow directed to the LS -VFS
10 cfs
Is a flow bypass system going to be used?
Y (Y or N)
Explanation of any "Other" responses above
Dry Detention Basin
Form SW401 - LS -VFS - Mune2012 - Rev. 10 page 1 of 18

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 level lip provided
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
NIA
sq ft No forebay is required.
in
in
10
fVcfs
100
ft
100
ft
30
ft
306.00
fmsl
304.00
fmsl
6.67
%
N
(Y or N) OK
N
(Y or N)
N/A (Y or N)
(Y or N)
it
ft
ft
ft
ft/sec
(Y or N)
(Y or N)
Level spreader bypass system utilizes the velocity dissipater designed for the BMP outlet.
W
1 B 1
Form SW401 - LS -VFS - 29June2012 - Rev. 10 page 2 of 18

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.
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.
Initials Page or plan sheet number and any notes:
Form SW401 - LS -VFS - 29June2012 - Rev. 10 page 3 of 18

MCADAMS
Subsection: Level Pool Pond Routing Summary Return Event: 10 years
Label: SWMF A (IN) Storm Event: 10 year
Infiltration
Flow (Peak In)
Infiltration Method
No Infiltration
(Computed)
Elevation (Water Surface,
324.00 ft
Pea k)
Initial Conditions
Volume (Peak)
Elevation (Water Surface,
316.00 ft
Initial)
Volume (Initial)
Volume (Initial)
0.000 ft3
Flow (Initial Outlet)
0.00 ft3 /s
Flow (Initial Infiltration)
0.00 ft3 /s
Flow (Initial, Total)
0.00 ft3 /s
Time Increment
1.000 min
Inflow /Outflow Hydrograph Summary
Flow (Peak In)
68.83 ft3 /s Time to Peak (Flow, In) 722.000 min
Flow (Peak Outlet)
15.59 ft3 /s Time to Peak (Flow, Outlet) 769.000 min
Elevation (Water Surface,
324.00 ft
Pea k)
Volume (Peak)
112,517.391 ft3
Mass Balance (ft3)
Volume (Initial)
0.000 ft3
Volume (Total Inflow)
265,631.000 ft3
Volume (Total Infiltration)
0.000 ft3
Volume (Total Outlet
262,221.000 ft3
Outflow)
Volume (Retained)
3,318.000 ft3
Volume (Unrouted)
- 92.000 ft3
Error (Mass Balance)
0.0%
Holding Village J. Shinn, El
3/11/2014

M11 MCADAMS
327.50
326.25
325.00
C
323.75
w 322.50
a�
v
321.25
a�
320.00
m
318.75
c
a° 317.50
316.25
315.00
0.00 2.00 4.00 6.00
Flow (ft3 /s)
RATING TABLE FOR ONE OUTLET TYPE
Structure ID = Orifice - 2 (Orifice -Area)
---------------------------------------
Upstream ID = (Pond Water Surface)
) ownstream ID = Culvert - 2 (Culvert- Circular)
8.00 10.00
Holding Village J. Shinn, El
5/5/2014
Composite Outlet Structure
Detailed Report: Outlet
Structure - A
Outlet Structure
Outlet Structure Type
Orifice
Outlet Structure (IDs and Direction)
Outlet ID
Flow Direction
Orifice - 2
Forward Flow
Only
Downstream ID
Notes
Culvert - 2
Outlet Structure (Advanced)
Elevation (On)
0.00 ft
Elevation (Off)
0.00 ft
Outlet Structure (Orifice)
Orifice
Number of Openings
Orifice Coefficient
Orifice Area
Area Orifice
1
0.600
0.750 ft2
Perpendicular
Orifice Orientation
Orifice
Datum Elevation 316.25 ft
Top Elevation 316.50 ft
Outlet Structure (Common)
Elevation
316.00 ft
327.50
326.25
325.00
C
323.75
w 322.50
a�
v
321.25
a�
320.00
m
318.75
c
a° 317.50
316.25
315.00
0.00 2.00 4.00 6.00
Flow (ft3 /s)
RATING TABLE FOR ONE OUTLET TYPE
Structure ID = Orifice - 2 (Orifice -Area)
---------------------------------------
Upstream ID = (Pond Water Surface)
) ownstream ID = Culvert - 2 (Culvert- Circular)
8.00 10.00
Holding Village J. Shinn, El
5/5/2014

Composite Outlet Structure
Detailed Report: Outlet
Structure - A
RATING TABLE FOR ONE OUTLET TYPE
Structure ID = Orifice - 2 (Orifice -Area)
Upstream ID = (Pond Water Surface)
Downstream ID = Culvert - 2 (Culvert- Circular)
Water Surface Device Flow (into) Headwater Converge Downstream Next Downstream
Elevation (ft3 /s) Hydraulic Grade Line Hydraulic Grade Line Hydraulic Grade Line
(ft) (ft) (ft) (ft)
316.00
0.00
0.00
0.00
0.00
316.10
0.36
316.10
Free Outfall
307.84
316.20
0.72
316.20
Free Outfall
307.99
316.30
1.08
316.30
Free Outfall
308.10
316.40
1.44
316.40
Free Outfall
308.19
316.50
1.80
316.50
Free Outfall
308.28
316.60
2.14
316.60
Free Outfall
308.36
316.70
2.42
316.70
Free Outfall
308.42
316.80
2.68
316.80
Free Outfall
308.47
316.90
2.91
316.90
Free Outfall
308.52
317.00
3.13
317.00
Free Outfall
308.56
317.10
3.33
317.10
Free Outfall
308.60
317.20
3.52
317.20
Free Outfall
308.64
317.30
3.70
31730
Free Outfall
308.67
317.40
3.87
317.40
Free Outfall
308.70
317.50
4.04
317.50
Free Outfall
308.73
317.60
4.19
317.60
Free Outfall
308.75
317.70
4.35
317.70
Free Outfall
308.78
317.80
4.49
317.80
Free Outfall
308.80
317.90
4.64
317.90
Free Outfall
308.83
318.00
4.78
318.00
Free Outfall
308.85
318.10
4.91
318.10
Free Outfall
308.88
318.20
5.04
318.20
Free Outfall
308.90
318.30
5.17
318.30
Free Outfall
308.92
318.40
5.29
318.40
Free Outfall
308.94
318.50
5.41
318.50
Free Outfall
308.96
318.60
5.53
318.60
Free Outfall
308.98
318.70
5.65
318.70
Free Outfall
309.00
318.80
5.76
318.80
Free Outfall
309.02
318.90
5.88
318.90
Free Outfall
309.03
319.00
5.99
319.00
Free Outfall
309.05
319.10
6.09
319.10
Free Outfall
309.07
319.20
6.20
319.20
Free Outfall
309.09
319.30
6.30
319.30
Free Outfall
309.10
319.40
6.41
319.40
Free Outfall
309.12
319.50
6.51
319.50
Free Outfall
309.14
319.60
6.61
319.60
Free Outfall
309.15
319.70
6.70
319.70
Free Outfall
309.17
319.80
6.80
319.80
Free Outfall
309.18
319.90
6.90
319.90
Free Outfall
309.20
320.00
6.99
320.00
Free Outfall
309.21
320.10
7.08
320.10
Free Outfall
309.23
320.20
7.17
320.20
Free Outfall
309.24
320.30
7.26
320.30
Free Outfall
309.26
Holding Village J. Shinn, El
5/5/2014

'J McADAMS
Composite Outlet Structure
Detailed Report: Outlet
Structure - A
RATING TABLE FOR ONE OUTLET TYPE
Structure ID = Orifice - 2 (Orifice -Area)
---------------------------------------
Upstream ID = (Pond Water Surface)
Downstream ID = Culvert - 2 (Culvert- Circular)
Water Surface
Device Flow
(into) Headwater
Converge Downstream
Next Downstream
Elevation
(ft3 /s)
Hydraulic Grade Line
Hydraulic Grade Line
Hydraulic Grade Line
(ft)
(ft)
(ft)
(ft)
320.40
7.35
320.40
Free Outfall
309.27
320.50
7.44
320.50
Free Outfall
309.29
320.60
7.53
320.60
Free Outfall
309.30
320.70
7.61
320.70
Free Outfall
309.31
320.80
7.70
320.80
Free Outfall
309.33
320.90
7.78
320.90
Free Outfall
309.34
321.00
7.87
321.00
Free Outfall
309.35
321.10
7.95
321.10
Free Outfall
309.37
321.20
8.03
321.20
Free Outfall
309.38
321.30
8.11
321.30
Free Outfall
309.39
321.40
8.19
321.40
Free Outfall
309.41
321.50
8.27
321.50
Free Outfall
309.42
321.60
8.35
321.60
Free Outfall
309.43
321.70
8.43
321.70
Free Outfall
309.44
321.80
8.50
321.80
Free Outfall
309.46
321.90
8.58
321.90
Free Outfall
309.47
322.00
8.66
322.00
Free Outfall
309.48
322.10
8.73
322.10
Free Outfall
309.49
322.20
8.81
322.20
Free Outfall
309.51
322.30
8.88
322.30
Free Outfall
309.52
322.40
8.95
322.40
Free Outfall
309.53
322.50
9.02
322.50
Free Outfall
309.54
322.60
9.10
322.60
Free Outfall
309.55
322.70
9.17
322.70
Free Outfall
309.57
322.80
9.24
322.80
Free Outfall
309.58
322.90
9.31
322.90
Free Outfall
309.60
323.00
9.38
323.00
Free Outfall
309.62
323.10
9.45
323.10
Free Outfall
309.63
323.20
9.52
323.20
Free Outfall
309.65
323.30
9.58
323.30
Free Outfall
309.67
323.40
9.65
323.40
Free Outfall
309.68
323.50
9.72
323.50
Free Outfall
309.70
323.60
9.79
323.60
Free Outfall
309.72
323.70
9.85
323.70
Free Outfall
309.73
IO _ 323.80
9.92
323.80
Free Outfall
309.75
323.90
9.98
323.90
Free Outfall
309.77
324.00
10.05
324.00
Free Outfall
309.78
324.10
10.11
324.10
Free Outfall
309.80
324.20
10.18
324.20
Free Outfall
309.82
324.30
10.24
324.30
Free Outfall
309.83
324.40
10.31
324.40
Free Outfall
309.85
324.50
10.37
324.50
Free Outfall
309.87
324,60
10.43
324.60
Free Outfall
309.88
324.70
10.49
324.70
Free Outfall
309.90
Holding Village J. Shinn, El
5/5/2014

J Mc.ADANIS
Composite Outlet Structure
Detailed Report: Outlet
Structure- A
RATING TABLE FOR ONE OUTLET TYPE
Structure ID = Orifice - 2 (Orifice -Area)
---------------------------------------
Upstream ID (Pond Water Surface)
Downstream ID = Culvert - 2 (Culvert - Circular)
Water Surface
Device Flow
(into) Headwater
Elevation
(ft3 /s)
Hydraulic Grade Line
(ft)
309.92
(ft)
324.80
10.56
324.80
324.90
10.62
324.90
325.00
10.68
325.00
325.10
10.74
325.10
325.20
10.80
325.20
325.30
10.86
325.30
325.40
10.92
325.40
325.50
10.98
325.50
325.60
11.04
325.60
325.70
11.10
325.70
325.80
11.16
325.80
325.90
11.21
325.90
326.00
11.27
326.00
Converge Downstream
Next Downstream
Hydraulic Gracie Line
Hydraulic Grade Line
(ft)
(fit)
Free Outfall
309.92
Free Outfall
309.93
Free Outfall
309.95
Free Outfall
309.97
Free Outfall
309.98
Free Outfall
310.00
Free Outfall
310.02
Free Outfall
310.03
Free Outfall
310.05
Free Outfall
310.07
Free Outfall
310.08
Free Outfall
310.10
Free Outfall
310.12
Downstream Hydraulic Convergence Error Downstream Channel Tailwater Error
Grade Line Error (ft3 /s) Tailwater (ft)
(ft) (ft)
Message
0.00
0.00
(N /A)
0,00
WS below an invert; no flow.
0.00
0.00
(N /A)
0.00
Hi =.10; Ht =.25; Qt =1.80
0.00
0.00
(N /A)
0.00
Hi =.20; Ht =.25; Qt =1.80
0.00
0.00
(N /A)
0.00
Hi =.30; Ht=. 25; Qt= 1.80
0.00
0.00
(N /A)
0.00
Hi =.40; Ht=. 25; Qt= 1.80
0.00
0.00
(N /A)
0.00
H =.25
0.00
0.00
(N /A)
0.00
H =.35
0.00
0.00
(N /A)
0.00
H =.45
0.00
0.00
(N /A)
0.00
H =.55
0.00
0.00
(N /A)
0.00
H =.65
0.00
0.00
(N /A)
0.00
H =.75
0.00
0.00
(N /A)
0.00
H =.85
0.00
0.00
(N /A)
0.00
H =.95
0.00
0.00
(N /A)
0.00
H =1.05
0.00
0.00
(N /A)
0.00
H =1.15
0.00
0.00
(N /A)
0.00
H =1.25
0,00
0.00
(N /A)
0.00
H =1.35
0.00
0.00
(N /A)
0.00
H =1.45
0.00
0.00
(N /A)
0.00
H =1.55
0.00
0.00
(N /A)
0.00
H =1.65
0100
0100
(N /A)
0.00
H =1.75
0.00
0.00
(N /A)
0.00
H =1.85
0.00
0.00
(N /A)
0.00
H =1.95
0.00
0.00
(N /A)
0.00
H =2,05
0.00
0.00
(N /A)
0.00
H =2.15
0.00
0.00
(N /A)
0.00
H =2.25
0.00
0.00
(N /A)
0,00
H =235
0.00
0.00
(N /A)
0.00
H =2.45
Holding Village
J. Shinn, El
5/5/2014

DESIGN OF RIPRAP OUTLET PROTECTION WORKSHEET
Project Holding Village - South Lake Date
Project No. RAP -13020 Designer
Outlet ID SWMF'A'
Outlet flowrate
15.59
cfs
Pipe diameter
36
inches
Number of pipes
1
Outlet flowrate
Pipe separation
0
feet
Outlet pipe slope
2.11
percent
6 in.
24- Jun -14
J. Shinn, EI
Figure 8.06.b.1
25
20
v
W 15
w
jr
y 10
5 one
0
0 1 2 3 4 5 6 7 8 9 10
Pipe diameter (ft)
Zone from graph above =
2
Diameter
Thickness
Outlet pipe diameter
36 in.
Length =
18.0 ft.
Outlet flowrate
15.6 cfs
Width =
10.2 ft.
Outlet velocity
10.1 ft/sec
Stone diameter =
6 in.
Material =
Class B
Thickness =
18 in.
Zone
Material
Diameter
Thickness
Length
Width
1
Class A
3
12
4 x D(o)
3 x D(o)
2
Class B
6
18
6 x D(o)
3 x D(o)
3
Class I
13
24
8 x D(o)
3 x D(o)
4
Class I
13
24
8 x D(o)
3 x D(o)
5
Class II
23
36
10 x D(o)
3 x D(o)
6
Class II
23
36
10 x D(o)
3 x D(o)
7
Special study required
1. Calculations based on NY DOT method - Pages 8.06.05 through 8.06.06 in NC Erosion Control Manual
2. Outlet velocity based on full -flow velocity
Stormwater - Velocity Disspator.xlsx
6/24/2014

Permit Number: _
(to be provided by DWQ)
Drainage Area Number: _
Filter Strip, Restored Riparian Buff er and Level Spreader
Operation and Maintenance Agreement
I will keep a maintenance record on this BMP. This maintenance record will be kept in a
log in a known set location. Any deficient BMP elements noted in the inspection will be
corrected, repaired or replaced immediately. These deficiencies can affect the integrity
of structures, safety of the public, and the removal efficiency of the BMP.
Important maintenance procedures:
— Immediately after the filter strip is established, any newly planted vegetation
will be watered twice weekly if needed until the plants become established
(commonly six weeks).
— Once a year, the filter strip will be reseeded to maintain a dense growth of
vegetation
— Stable groundcover will be maintained in the drainage area to reduce the
sediment load to the vegetation.
— Two to three times a year, grass filter strips will be mowed and the clippings
harvested to promote the growth of thick vegetation with optimum pollutant
removal efficiency. Turf grass should not be cut shorter than 3 to 5 inches and
may be allowed to grow as tall as 12 inches depending on aesthetic requirements
(NIPC,1993). Forested .filter strips do not require this type of maintenance.
— Once a year, the soil will be aerated if necessary.
— Once a year, soil pH will be tested and lime will be added if necessary.
After the filter strip is established, it will be inspected quarterly and within 24 hours
after every storm event greater than 1.0 inch (or 1.5 inches if in a Coastal County).
Records of operation and maintenance will be kept in a known set location and will be
available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be .repaired immediately.
BMP element:
Potential problem:
How I will remediate the problem:
The entire filter strip
Trash/ debris is present.
Remove the trash/ debris.
system
The flow splitter device
The flow sputter device is
Unclog the conveyance and dispose
(if applicable)
clogged.
of any sediment off -site.
The flow splitter device is
Make any necessary repairs or
damaged.
replace if damage is too large for
repair.
Form SWU401 -Level Spreader, Filter Strip, Restored Riparian. Buffer O &M -Rev.3 Page 1 of 3

BMP element:
Potential problem:
How I will remediate the problem:
The Swale and the level
The swale is clogged with
Remove the sediment and dispose
lip
sediment.
of it off -site.
The level lip is cracked,
Repair or replace lip.
settled, undercut, eroded or
otherwise damaged.
There is erosion around the
Regrade the soil to create a berm
end of the level spreader that
that is higher than the level lip, and
shows stormwater has
then plant a ground cover and
bypassed it.
water until it is established. Provide
lime and a one -time fertilizer
a lication.
Trees or shrubs have begun
Remove them.
to grow on the Swale or just
downslo e of the level lip.
The bypass channel
Areas of bare soil and /or
Regrade the soil if necessary to
erosive gullies have formed.
remove the gully, and then
reestablish proper erosion control.
Turf reinforcement is
Study the site to see if a larger
damaged or ripap is rolling
bypass channel is needed (enlarge if
downhill.
necessary). After this, reestablish
the erosion control material.
The filter strip
Grass is too short or too long
Maintain grass at a height of
(if applicable).
a roximatel three to six inches.
Areas of bare soil and /or
Regrade the soil if necessary to
erosive gullies have formed.
remove the gully, and then plant a
ground cover and water until it is
established. Provide lime and a
one -time fertilizer application.
Sediment is building up on
Remove the sediment and
the filter strip.
restabilize the soil with vegetation if
necessary. Provide lime and a one-
time fertilizer application.
Plants are desiccated.
Provide additional irrigation and
fertilizer as needed.
Plants are dead, diseased or
Determine the source of the
dying.
Y g
problem: soils, hydrology, disease,
p
etc. Remedy the problem and
replace plants. Provide a one -time
fertilizer application.
Nuisance vegetation is
Remove vegetation by hand if
choking out desirable species.
possible. If pesticide is used, do not
allow it to get into the receiving
water.
The receiving water
Erosion or other signs of
Contact the NC Division of Water
damage have occurred at the
Quality local Regional Office, or the
outlet.
401 Oversight Unit at 919 - 733 -1786.
Form SWU401 -Level Spreader, Filter Strip, Restored Riparian Buffer O &M -Rev.3 Page 2 of 3

Permit Number:
(to be provided by DWQ)
I acknowledge and agree by my signature below that I atn responsible for the
performance of the maintenance procedures listed above. I agree to notify DWQ of any
problems with the system or prior to any changes to the system or responsible party.
Project name:South Lake at Holding Village
BMP drainage area number: A
Print name:WSR HV LLC c/o Reader and Partners c/o Mr. Scott LU
Title:Vice President
Address:8480 Honeycutt Road Suite 200
19 -714-
Signature:
Date: L'
Note: The legally responsible parry should not be a homeowners association unless more than 50% of
the lots have been sold and a resident of the subdivision has been named the president.
1,t, (A i V� M , a Notary Public for the State of
s °T 6 Y,6'07YI 4, County of W& , do hereby certify that
2-?4P personally appeared before me this
day of O L^ , and acknowledge the due execution of the
forgoing filter strip, riparian buffer, and /or level spreader maintenance requirements.
Witness my hand and official seal,
Holly Van Apeldoorn
Notary Public
Wake County, NC
My Commission Expires June 25, 2017
SEAL
My commission expires
Form SWU401 -Level Spreader, Filter Strip, Restored Riparian Buffer O &M -Rev.3 Page 3 of 3

LEVEL SPREADER `B'
SOUTH LAKE AT HOLDING VILLAGE
RAP-13020

Form SW401 - LS -VFS - 29June2012 - Rev. 10 page 4 of 18
y OAN"Ar
WDENR
O 'c
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
Holding Village
Contact name
Kevin Yates
Phone number
919 - 361 -5000
Date
June 24, 2014
Drainage area number
Sub 2 to SWMF'B'
II. DESIGN INFORMATION
The purpose of the LS -VFS
SW Rule: !0 -year drawdown from Wet Pond
Stormwater enters LS -VFS from
A BMP
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
fly Do not complete this section of the form.
Impervious surface area
f? Do not complete this section of the form.
Percent impervious
% Do not complete this section of the form.
Rational C coefficient
Do not complete this section of the form.
Peak flow from the 1 in /hr storm
cfs Do not complete this section of the form.
Time of concentration
min Do not complete this section of the form.
Rainfall intensity, 10 -yr storm
in /hr Do not complete this section of the form.
Peak flow from the 10 -yr storm
cfs Do not complete this section of the form.
Design storm
Maximum amount of 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) Do not complete this section of the form.
Explanation of any "Other" responses above
If Stormwater Enters the LS -VFS from a BMP
Type of BMP
Wet detention pond
Peak discharge from the BMP during the design storm
31.51 cfs
Peak discharge from the BMP during the 10 -year storm
31.51 cfs
Maximum capacity of a 100 -foot long LS -VFS
10 cfs
Peak flow directed to the LS -VFS
10 cfs
Is a flow bypass system going to be used?
Y (Y or N)
Explanation of any "Other" responses above
Form SW401 - LS -VFS - 29June2012 - Rev. 10 page 4 of 18

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 level lip provided
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
N/A
sq ft No forebay is required.
in
in
10
ft/cfs
100
It
100
ft
30
ft
290.00
fmsl
288.00
fmsl
6.67
%
N
(Y or N) OK
N
(Y or N)
N/A (Y or N)
(Y or N)
ft
It
It
ft
ft
ft/sec
(Y or N)
(Y or N)
Level spreader bypass system utilizes the velocity dissipater designed for the BMP outlet.
W
1 B 1
Form SW401 - LS -VFS - 29June2012 - Rev. 10 page 5 of 18

III. REQUIRED ITEMS CHECK
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.
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.
Initials Page or plan sheet number and any notes:
Form SW401 - LS -VFS - 29June2012 - Rev. 10 page 6 of 18

'J MCADAMS
Subsection: Level Pool Pond Routing Summary
Label: SWMF B (IN)
Infiltration
Infiltration Method No Infiltration
(Computed)
Initial Conditions
Elevation (Water Surface,
293.00 ft
Initial)
Volume (Initial)
0.000 ft3
Flow (Initial Outlet)
0.00 ft3 /s
Flow (Initial Infiltration)
0.00 ft3 /s
Flow (Initial, Total)
0.00 ft3 /s
Time Increment
1.000 min
Inflow /Outflow Hydrograph Summary
Return Event: 10 years
Storm Event: 10 year
Flow (Peak In) 130.79 ft3 /s Time to Peak (Flow, In) 721.000 min
Flow (Peak Outlet) 31.51 ft3 /s Time to Peak (Flow, Outlet) 751.000 min
Elevation (Water Surface,
297,95 ft
Peak)
Volume (Peak)
123,842.361 ft3
Mass Balance (ft3)
Volume (Initial)
0.000 ft3
Volume (Total Inflow)
311,429.000 ft3
Volume (Total Infiltration)
0.000 ft3
Volume (Total Outlet
303,217.000 ft3
Outflow)
Volume (Retained)
8,112.000 ft3
Volume (Unrouted)
- 100.000 ft3
Error (Mass Balance)
0.0%
Holding Village J. Shinn, El
3/11/2014

McADAMS
Composite Outlet Structure
Detailed Report: Outlet
Structure - B
RATING TABLE FOR ONE OUTLET TYPE
Outlet Structure Type
Orifice
Structure ID = Culvert - 1 (Culvert- Circular)
Outlet Structure (IDs and Direction)
Outlet ID
---------------------------------------
Mannings open channel maximum capacity: 274.57 ft3 /s
Downstream ID
Culvert - 2
Flow Direction
Forward Flow
Notes
Upstream ID = Riser - 1 (Inlet Box)
Only
Outlet Structure (Advanced)
Downstream ID = Tailwater (Pond Outfall)
Elevation (On)
0.00 ft
Elevation (Off)
Downstream Hydraulic Convergence Error Downstream Channel
Outlet Structure (Orifice)
Tailwater Error
Message
Grade Line Error (ft3 /s) Tailwater
Area Orifice
(ft)
Perpendicular
(ft) (ft)
Orifice
Number of Openings
1
Datum Elevation
293.33 ft
0.00 0.00
(N /A)
0.00
INLET CONTROL...
Submerged:
HW
Outlet Structure (Common)
=7.97
0.00 0.00
(N /A)
0.00
INLET CONTROL...
Submerged:
HW
=9.04
0.00 0.00
(N /A)
0.00
INLET CONTROL...
Submerged:
HW
=10.24
0.00 0.00
(N /A)
0.00
INLET CONTROL...
Submerged:
HW
=11.58
0.00 0.00
(N /A)
0.00
INLET CONTROL...
Submerged:
HW
=13.08
0.00 0.00
(N /A)
0.00
INLET CONTROL...
Submerged:
HW
=14.73
0.00 0.00
(N /A)
0.00
INLET CONTROL...
Submerged:
HW
=16.54
0.00 5.70
(N /A)
0.00
INLET CONTROL...
Submerged:
HW
=17.80
0.00 21.45
(N /A)
0.00
INLET CONTROL...
Submerged:
HW
=17.90
0.00 26.91
(N /A)
0.00
INLET CONTROL...
Submerged:
HW
=18.00
Outlet Structure
Outlet Structure Type
Orifice
Outlet Structure (IDs and Direction)
Outlet ID
Orifice - 2
Downstream ID
Culvert - 2
Flow Direction
Forward Flow
Notes
Only
Outlet Structure (Advanced)
Elevation (On)
0.00 ft
Elevation (Off)
0.00 ft
Outlet Structure (Orifice)
Orifice
Area Orifice
Orifice Orientation
Perpendicular
Orifice
Number of Openings
1
Datum Elevation
293.33 ft
Orifice Coefficient
0.600
Top Elevation
293.67 ft
Orifice Area
1.000 ftz
Outlet Structure (Common)
Elevation
293.00 ft
Holding Village J. Shinn, El
5/5/2014

W1 MCADAMS
300.00
299.38
298.75
c 298.13
0
297.50
a�
w 296.88
0
V
296.25
LO 295.63
a�
0 295.00
c 294.38
0
a 293.75
293.13
292.50
0.00
Composite Outlet Structure
Detailed Report: Outlet
Structure - B
2.00 4.00 6.00 8.00 10.00
Flow (ft3 /s)
RATING TABLE FOR ONE OUTLET TYPE
Structure ID = Orifice - 2 (Orifice -Area)
---------------------------------------
Upstream ID = (Pond Water Surface)
Downstream ID = Culvert - 2 (Culvert- Circular)
Water Surface Device Flow (into) Headwater Converge Downstream Next Downstream
Elevation (ft3 /s) Hydraulic Grade Line Hydraulic Grade Line Hydraulic Grade Line
�ff M (ft) (ft)
293.00
0.00
0.00
0.00
0.00
293.10
0.42
293.10
Free Outfall
291.87
293.20
0.83
293.20
Free Outfall
292.02
293.30
1.25
293.30
Free Outfall
292.14
293.40
1.67
293.40
Free Outfall
292.25
293.50
2.09
293.50
Free Outfall
292.35
293.60
2.50
293.60
Free Outfall
292.44
293.70
2.92
293.70
Free Outfall
292.52
293.80
3.29
293.80
Free Outfall
292.59
293.90
3.62
293.90
Free Outfall
292.65
294.00
3.93
294.00
Free Outfall
292.71
294.10
4.22
294.10
Free Outfall
292.76
294.20
4.48
294.20
Free Outfall
292.80
294.30
4.73
294.30
Free Outfall
292.85
294.40
4.97
294.40
Free Outfall
292.89
294.50
5.20
294.50
Free Outfall
292.92
294.60
5.42
294.60
Free Outfall
292.96
294.70
5.63
294.70
Free Outfall
292.99
294.80
5.83
294.80
293.03
293.03
294.90
6.02
294.90
293.06
293.06
Holding Village J. Shinn, El
5/5/2014

I
Composite Outlet Structure
Detailed Report: Outlet
Structure - B
RATING TABLE FOR ONE OUTLET TYPE
Structure ID = Orifice - 2 (Orifice -Area)
---------------------------------------
Upstream ID = (Pond Water Surface)
Downstream ID = Culvert - 2 (Culvert- Circular)
Water Surface Device Flow (into) Headwater Converge Downstream Next Downstream
Elevation (ft3 /s) Hydraulic Grade Line Hydraulic Grade Line Hydraulic Grade Line
(ft) (ft) (ft) (ft)
295.00
6.21
295.00
293.09
293.09
295.10
6.40
295.10
293.12
293.12
295.20
6.58
295.20
293.15
293.15
295.30
6.75
295.30
293.18
293.18
295.40
6.92
295.40
293.20
293.20
295.50
7.09
295.50
293.23
293.23
295.60
7.25
295.60
293.25
293.25
295.70
7.40
295.70
293.28
293.28
295.80
7.56
295.80
293.30
293.30
295.90
7.71
295.90
293.33
293.33
296.00
7.84
296.00
293.35
293.35
296.10
7.96
296.10
293.37
293.37
296.20
8.07
296.20
293.39
293.39
296.30
8.19
296.30
293.40
293.40
296.40
8.30
296.40
293.42
293.42
296.50
8.41
296.50
293.44
293.44
296.60
8.53
296.60
293.46
293.46
296.70
8.64
296.70
293.48
293.48
296.80
8.75
296.80
293.50
293.50
296.90
8.86
296.90
293.52
293.52
297.00
8.96
297.00
293.53
293.53
297.10
9.07
297.10
293.55
293.55
297.20
9.18
297.20
293.57
293.57
297.30
9.27
297.30
293.59
293.59
297.40
9.36
297.40
293.62
293.62
297.50
9.46
297.50
293.64
293.64
297.60
9.55
297.60
293.66
293.66
297.70
9.64
297.70
293.68
293.68
10 _ jr 297.80
9.74
297.80
293.71
293.71
297.90
9.83
297.90
293.73
293.73
298.00
9.92
298.00
293.75
293.75
298.10
10.01
298.10
293.78
293.78
298.20
10.10
298.20
293.80
293.80
298.30
10.18
298.30
293.82
293.82
298.40
10.27
298.40
293.85
293.85
298.50
10.36
298.50
293.87
293.87
298.60
10.44
298.60
293.89
293.89
298.70
10.53
298.70
293.91
293.91
298.80
10.48
298.80
294.06
0.00
298.90
10.76
298.90
293.90
293.90
299.00
10.78
299.00
293.98
293.98
299.10
10.86
299.10
294.01
294.01
299.30
101.03
299.30
294.05
294.05
Holding Village J. Shinn, El
5/5/2014

J MCADAMS
Composite Outlet Structure
Detailed Report: Outlet
Structure - B
RATING TABLE FOR ONE OUTLET TYPE
0.00
(N /A)
Structure ID = Orifice - 2 (Orifice -Area)
WS below an invert; no flow.
0.00
---------------------------------------
Upstream ID = (Pond Water Surface)
(N /A)
0.00
Downstream ID = Culvert - 2 (Culvert- Circular)
0.00
0.00
Water Surface Device Flow
(into) Headwater
Converge Downstream
Elevation (ft3 /s)
Hydraulic Grade Line
Hydraulic Grade Line
(ft)
(ft)
(ft)
299.40 11.11
299.40
294.07
299.50 11.00
299.50
294.28
299.60 11.30
299.60
294.09
299.70 11.27
299.70
294.22
299.80 11.43
299.80
294.16
299.90 11.51
299.90
294.18
300.00 11.58
300.00
294.21
Downstream Hydraulic Convergence Error Downstream Channel Tailwater Error
Grade Line Error (ft3 /s) Tailwater (ft)
(ft) (ft)
Next Downstream
Hydraulic Grade Line
294.07
294.28
294.09
294.22
294.16
294.18
294.21
Message
0.00
0.00
(N /A)
0.00
WS below an invert; no flow.
0.00
0.00
(N /A)
0.00
Hi =.10; Ht =.33; Qt =2.78
0.00
0.00
(N /A)
0.00
Hi =.20; Ht =.33; Qt =2.78
0.00
0.00
(N /A)
0.00
Hi =.30; Ht =.33; Qt =2.78
0.00
0.00
(N /A)
0.00
Hi =.40; Ht =.33; Qt =2.78
0.00
0.00
(N /A)
0.00
Hi =.50; Ht =.33; Qt =2.78
0.00
0.00
(N /A)
0.00
Hi =.60; Ht =.33; Qt =2.78
0.00
0.00
(N /A)
Q.00
H =37
0.00
0.00
(N /A)
0.00
H =.47
0.00
0.00
(N /A)
0.00
H =.57
0.00
0.00
(N /A)
0.00
H =.67
0.00
0.00
(N /A)
0.00
H =.77
0.00
0.00
(N /A)
0.00
H =.87
0.00
0.00
(N /A)
0.00
H =.97
0.00
0.00
(N /A)
0.00
H =1.07
0.00
0.00
(N /A)
0.00
H =1.17
0.00
0.00
(N /A)
0.00
H =1.27
0.00
0.00
(N /A)
0.00
H =1.37
0.00
0.00
(N /A)
0.00
H =1.47
0.00
0.00
(N /A)
0.00
H =1.57
0.00
0.00
(N /A)
0.00
H =1.67
0.00
0.00
(N /A)
0.00
H =1.77
0.00
0.00
(N /A)
0.00
H =1.87
0.00
0.00
(N /A)
0.00
H =1.97
0.00
0.00
(N /A)
0.00
H =2.07
0.00
0.00
(N /A)
0.00
H =2.17
0.00
0.00
(N /A)
0.00
H =2.27
0.00
0.00
(N /A)
0.00
H =2.37
0.00
0.00
(N /A)
0.00
H =2.47
0.00
0.00
(N /A)
0.00
H =2.57
0.00
0.00
(N /A)
0.00
H =2.65
0.00
0.00
(N /A)
0.00
H =2.73
I 0.00
0.00
(N /A)
0.00
H =2.81
0.00
0.00
(N /A)
0.00
H =2.90
Holding Village
J. Shinn, El
5/5/2014

DESIGN OF RIPRAP OUTLET PROTECTION WORKSHEET
Project Holding Village - South Lake Date
Project No. RAP -13020 Designer
Outlet ID
SWMF'B'
Diameter
Thickness
Outlet pipe diameter
Outlet flowrate
31.51
cfs
Pipe diameter
48
inches
Number of pipes
1
13.8 ft/sec
Pipe separation
0
feet
Outlet pipe slope
5
percent
13
24- Jun -14
J. Shinn, EI
Zone from graph above =
3
Diameter
Thickness
Outlet pipe diameter
48 in.
Length =
32.0 ft.
Outlet flowrate
31.5 cfs
Width =
16.8 ft.
Outlet velocity
13.8 ft/sec
Stone diameter =
13 in.
Material =
Class I
Thickness =
24 in.
Zone
Material
Diameter
Thickness
Length
Width
1
Class A
3
12
4 x D(o)
3 x D(o)
2
Class B
6
18
6 x D(o)
3 x D(o)
3
Class I
13
24
8 x D(o)
3 x D(o)
4
Class I
13
24
8 x D(o)
3 x D(o)
5
Class II
23
36
10 x D(o)
3 x D(o)
6
Class II
23
36
1 10 x D(o)
3 x D(o)
7
Special study required
1. Calculations based on NY DOT method - Pages 8.06.05 through 8.06.06 in NC Erosion Control Manual
2. Outlet velocity based on full -flow velocity
Stormwater - Velocity Disspator.xlsx
6/24/2014

Permit Number:_
(to be provided by DWQ)
Drainage Area Number:___
Filter Strip, Restored Riparian Buffer and Level Spreader
Operation and Maintenance Agreement
I will keep a maintenance record on this BMP. This maintenance record will be kept in a
log in a known set location. Any deficient BMP elements noted in the inspection will be
corrected, repaired or replaced immediately. These deficiencies can affect the integrity
of structures, safety of the public, and the removal efficiency of the BMP.
Important maintenance procedures:
— Immediately after the filter strip is established, any newly planted vegetation
will be watered twice weekly if needed until the plants become established
(commonly six weeks).
— Once a year, the filter strip will be reseeded to maintain a dense growth of
vegetation.
— Stable groundcover will be maintained in the drainage area to reduce the
sediment load to the vegetation.
— Two to three times a year, grass filter strips will be mowed and the clippings
harvested to promote the growth of thick vegetation with optimum pollutant
removal efficiency. Turf grass should not be cut shorter than 3 to 5 inches and
may be allowed to grow as tall as 12 inches depending on aesthetic requirements
(NIPC,1993). Forested filter strips do not require this type of maintenance.
— Once a year, the soil will be aerated if necessary.
— Once a year, soil pH will be tested and lime will be added if necessary.
After the filter strip is established, it will be inspected quarterly and within 24 hours
after every storm event greater than 1.0 inch (or 1.5 inches if in a Coastal County).
Records of operation and maintenance will be kept in a known set location and will be
available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element:
Potential problem:
How I will remediate the problem:
The entire filter strip
Trash/ debris is present.
Remove the trash/ debris.
system
The flow splitter device
The flow splitter device is
Unclog the conveyance and dispose
(if applicable)
clogged.
of any sediment off -site.
The flow splitter device is
Make any necessary repairs or
damaged.
replace if damage is too large for
repair.
Form SWU401 -Level Spreader, Filter Strip, Restored Riparian Buffer O &M -Rev.3 Page 1 of 3

BMP element:
Potential problem:
How I will remediate the problem:
The swale and the level
The swale is clogged with
Remove the sediment and dispose
lip
sediment.
of it off -site.
The level lip is cracked,
Repair or replace lip.
settled, undercut, eroded or
otherwise damaged.
There is erosion around the
Regrade the soil to create a berm
end of the level spreader that
that is higher than the level lip, and
shows stormwater has
then plant a ground cover and
bypassed it.
water until it is established. Provide
lime and a one -time fertilizer
a lication.
Trees or shrubs have begun
Remove them.
to grow on the swale or just
downslo e of the level lip.
The bypass channel
Areas of bare soil and /or
Regrade the soil if necessary to
erosive gullies have formed.
remove the gully, and then
reestablish proper erosion control.
Turf reinforcement is
Study the site to see if a larger
damaged or ripap is rolling
bypass channel is needed (enlarge if
downhill.
necessary). After this, reestablish
the erosion control material.
The filter strip
Grass is too short or too long
Maintain grass at a height of
(if applicable).
approximately three to six inches._
Areas of bare soil and /or
Regrade the soil if necessary to
erosive gullies have formed.
remove the gully, and then plant a
ground cover and water until it is
established. Provide lime and a
one -time fertilizer application.
Sediment is building up on
Remove the sediment and
the filter strip.
restabilize the soil with vegetation if
necessary. Provide lime and a one-
time fertilizer application,
Plants are desiccated.
Provide additional irrigation and
fertilizer as needed.
Plants are dead, diseased or
Determine the source of the
dying.
problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants. Provide a one -time
fertilizer application.
Nuisance vegetation is
Remove vegetation by hand if
choking out desirable species.
possible. If pesticide is used, do not
allow it to get into the receiving
water.
The receiving water
Erosion or other signs of
Contact the NC Division of Water
damage have occurred at the
Qualiy local Regional Office, or the
[4010
outlet.
ersi ht Unit at 919 - 733 -1786.
Form SWU401 -Level Spreader, Filter Strip, Restored Riparian Buffer O &M -Rev.3 Page 2 of 3

Permit Number:
(to be provided by DWQ)
I acknowledge and agree by my signature below that I am responsible for the
performance of the maintenance procedures listed above. I agree to notify DWQ of any
problems with the system or prior to any changes to the system or responsible party.
Project name:South Lake at Holding Village _
BMP drainage area number:
Print name:WSR HV LLC c/o Reader and Partners c/o Mr. Scott Lay
Title:Vice President
Address:8480 Honeycutt Road Suite 200
Phone: 919- 714 - 7879// 7
Signature:
Date: L'
Note: The legally responsible party should not be a homeowners association unless more than 50% of
the lots have been sold and a resident of the subdivision has been named the president.
I, �� 1 �'� i , a Notary Public for the State of
Y) tJ AT ' 6 4YZ61OW /)-, County of 1 do hereby certify that
_�5 6 d J° 2.. personally appeared before me this
day of OiZ L_ , and acknowledge the due execution of the
forgoing filter strip, riparian buffer, and /or level spreader maintenance requirements.
Witness my hand and official seal,
Holly Van Apeldoorn
Notary Public
Wake County, NC
My Commission Expires June 25, 2017
V4
SEAL
My commission expires UL '� II_
Form SWU401 -Level Spreader, Filter Strip, Restored Riparian Buffer O &M -Rev.3 Page 3 of 3

LEVEL SPREADER `C'
SOUTH LAKE AT HOLDING VILLAGE
RAP-13020

•
- -0 WArF9Qy
r
�
NCDENR
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
Holding Village
Contact name
Kevin Yates
Phone number
919 - 361 -5000
Date
June 24, 2014
Drainage area number
Sub 2 to SWMF 'C'
II. DESIGN INFORMATION
The purpose of the LS -VFS
SW Rule: !0 -year drawdown from Wet Pond
Stormwater enters LS -VFS from
A BMP
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
f? Do not complete this section of the form.
Impervious surface area
ff Do not complete this section of the form.
Percent impervious
% Do not complete this section of the form.
Rational C coefficient
Do not complete this section of the form.
Peak flow from the 1 in /hr storm
cfs Do not complete this section of the form.
Time of concentration
min Do not complete this section of the form.
Rainfall intensity, 10 -yr storm
in /hr Do not complete this section of the form.
Peak flow from the 10 -yr storm
cfs Do not complete this section of the form.
Design storm
Maximum amount of 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) Do not complete this section of the form.
Explanation of any "Other" responses above
If Stormwater Enters the LS -VFS from a BMP
Type of BMP Wet detention pond
Peak discharge from the BMP during the design storm 19.18 cfs
Peak discharge from the BMP during the 10 -year storm 19.18 cfs
Maximum capacity of a 100 -foot long LS -VFS 10 cfs
Peak flow directed to the LS -VFS 10 cfs
Is a flow bypass system going to be used? Y (Y or N)
Explanation of any "Other" responses above
Form SW401 - LS -VFS - 29June2012 - Rev. 10 page 7 of 18

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 level lip provided
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 providers?
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
N/A
sq ft No forebay is required.
in
in
10
fUcfs
100
ft
100
ft
30
ft
248.00
fmsl
246.00
fmsl
6.67
%
N
(Y or N) OK
Y
(Y or N)
N/A (Y or N)
(Y or N)
ft
ft
ft
ft
ft
fYsec
(Y or N)
(Y or N)
Level spreader bypass system utilizes the velocity dissipater designed for the BMP outlet.
W
1 B 1
Form SW401 - LS -VFS - 29June2012 - Rev. 10 page 8 of 18

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.
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.
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.
Initials Page or plan sheet number and any notes:
Form SW401 - LS -VFS - 29June2012 - Rev. 10 page 9 of 18

!J'I MCADAMS
Subsection: Level Pool Pond Routing Summary
Label: SWMF C (IN)
Infiltration
0.000 ft3
Infiltration Method
No Infiltration
(Computed)
0.000 ft3
Volume (Total Outlet
181,625.000 ft3
Initial Conditions
Elevation (Water Surface,
248.00 ft
Initial)
- 65.000 ft3
Volume (Initial)
0.000 ft3
Flow (Initial Outlet)
0.00 ft3 /s
Flow (Initial Infiltration)
0.00 ft3 /s
Flow (Initial, Total)
0.00 ft3 /s
Time Increment
1.000 min
Return Event: 10 years
Storm Event: 10 year
Inflow /Outflow Hydrograph Summary
Flow (Peak In) 82.16 ft3 /s Time to Peak (Flow, In) 721.000 min
Flow (Peak Outlet) 18.94 ft3 /s Time to Peak (Flow, Outlet) 752.000 min
Elevation (Water Surface, 251.79 ft
Peak)
Volume (Peak) 85,862.842 ft3
Mass Balance (ft3)
Volume (Initial)
0.000 ft3
Volume (Total Inflow)
195,193.000 ft3
Volume (Total Infiltration)
0.000 ft3
Volume (Total Outlet
181,625.000 ft3
Outflow)
Volume (Retained)
13,503.000 ft3
Volume (Unrouted)
- 65.000 ft3
Error (Mass Balance)
0.0%
Holding Village J. Shinn, El
5/5/2014

'j MCADAMS
Composite Outlet Structure
Detailed Report: Outlet
Structure - C
RATING TABLE FOR ONE OUTLET TYPE
Outlet Structure Type
Orifice
Structure ID = Culvert - 1 (Culvert- Circular)
---------------------------------------
Mannings open channel maximum capacity: 88.99 ft3 /s
Outlet ID
Flow Direction
Orifice - 2
Forward Flow
Only
Downstream ID
Notes
Upstream ID = Riser - 1 (Inlet Box)
Outlet Structure (Advanced)
Downstream ID = Tailwater (Pond Outfall)
Elevation (On)
0.00 ft
Elevation (Off)
Downstream Hydraulic Convergence Error Downstream Channel
Tailwater Error
Message
Grade Line Error (ft3 /s) Tailwater
(ft)
Orifice
Number of Openings
Orifice Coefficient
Orifice Area
Area Orifice
1
0.600
1.500 ftz
(ft) (ft)
Perpendicular
Orifice
248.50 ft
249.00 ft
0.00 20.51
(N /A)
0.00
INLET CONTROL...
Submerged:
HW
=10.10
0.00 31.45
(N /A)
0.00
INLET CONTROL...
Submerged:
HW
=10.20
0.00 42.73
(N /A)
0.00
INLET CONTROL...
Submerged:
HW
=10.30
0.00 54.37
(N /A)
0.00
INLET CONTROL...
Submerged:
HW
=10.40
0.00 66.33
(N /A)
0.00
INLET CONTROL...
Submerged:
HW
=10.50
0.00 70.38
(N /A)
0.00
INLET CONTROL...
Submerged:
HW
=10.60
0.00 73.89
(N /A)
0.00
INLET CONTROL...
Submerged:
HW
=10.70
0.00 77.29
(N /A)
0.00
INLET CONTROL...
Submerged:
HW
=10.80
0.00 80.63
(N /A)
0.00
INLET CONTROL...
Submerged:
HW
=10.90
0.00 83.88
(N /A)
0.00
INLET CONTROL...
Submerged:
HW
=11.00
Outlet Structure
Outlet Structure Type
Orifice
Outlet Structure (IDs and Direction)
Outlet ID
Flow Direction
Orifice - 2
Forward Flow
Only
Downstream ID
Notes
Culvert - 2
Outlet Structure (Advanced)
Elevation (On)
0.00 ft
Elevation (Off)
0.00 ft
Outlet Structure (Orifice)
Orifice
Number of Openings
Orifice Coefficient
Orifice Area
Area Orifice
1
0.600
1.500 ftz
Orifice Orientation
Datum Elevation
Top Elevation
Perpendicular
Orifice
248.50 ft
249.00 ft
Outlet Structure (Common)
Elevation
248.00 ft
Holding Village J. Shinn, El
5/5/2014

M11 MCADAMS
254.00
253.50
- 253.00
c 252.50
0
Y
> 252.00
0
w 251.50
a)
U
P 251.00
L
250.50
L
m 250.00
249.50
0
0- 249.00
248.50
►�' 11
1 Me
Composite Outlet Structure
Detailed Report: Outlet
Structure- C
2.00 4.00 6.00 8.00 10.00 12.00
Flow (ft3 /s)
RATING TABLE FOR ONE OUTLET TYPE
Structure ID = Orifice - 2 (Orifice -Area)
---------------------------------------
Upstream ID = (Pond Water Surface)
Downstream ID = Culvert - 2 (Culvert- Circular)
Water Surface Device Flow (into) Headwater Converge Downstream Next Downstream
Elevation (ft3 /s) Hydraulic Grade Line Hydraulic Grade Line Hydraulic Grade Line
(ft) (ft) (ft) (ft)
248.00
0.00
0.00
0.00
0.00
248.10
0.00
248.10
248.10
248.10
248.20
0.12
248.20
248.18
248.18
248.30
0.23
248.30
248.27
248.27
248.40
0.40
248.40
248.35
248.35
248.50
0.59
248.50
248.43
248.43
248.60
0.84
248.60
248.52
248.52
248.70
1.11
248.70
248.60
248.60
248.80
1.43
248.80
248.69
248.69
248.90
1.81
248.90
248.78
248.78
249.00
2.32
249.00
248.90
248.90
249.10
2.66
249.10
248.96
248.97
249.20
2.98
249.20
249.03
249.03
249.30
3.30
249.30
249.09
249.09
249.40
3.61
249.40
249.15
249.15
249.50
3.92
249.50
249.20
249.20
249.60
4.22
249.60
249.26
249.26
249.70
4.52
249.70
249.31
249.31
249.80
4.80
249.80
249.36
249.36
249.90
5.08
249.90
249.40
249.40
Holding Village J. Shinn, El
5/5/2014

�JI MCADAMS
Composite Outlet Structure
Detailed Report: Outlet
Structure - C
RATING TABLE FOR ONE OUTLET TYPE
Structure ID = Orifice - 2 (Orifice -Area)
---------------------------------------
Upstream ID = (Pond Water Surface)
Downstream ID = Culvert - 2 (Culvert - Circular)
Water Surface Device Flow (into) Headwater Converge Downstream Next Downstream
Elevation (ft3 /s) Hydraulic Grade Line Hydraulic Grade Line Hydraulic Grade Line
(ft) (ft) (ft) (ft)
250.00
5.35
250.00
249.45
249.45
250.10
5.62
250.10
249.49
249.49
250.20
5.89
250.20
249.54
249.54
250.30
6.14
250.30
249.58
249.58
250.40
6.39
250.40
249.62
249.62
250.50
6.63
250.50
249.66
249.66
250.60
6.87
250.60
249.69
249.69
250.70
7.10
250.70
249.73
249.73
250.80
7.33
250.80
249.77
249.77
250.90
7.56
250.90
249.80
249.80
251.00
7.78
251.00
249.84
249.84
251.10
8.00
251.10
249.87
249.87
251.20
8.21
251.20
249.91
249.91
251.30
8.41
251.30
249.94
249.94
251.40
8.62
251.40
249.97
249.98
251.50
8.82
251.50
250.01
250.01
251.60
9.01
251.60
250.04
250.04
Y 251.70
9.20
251.70
250.08
250.08
WSEL. 251.80
9.37
251.80
250.12
250.12
251.90
9.52
251.90
250.16
250.16
252.00
9.68
252.00
250.20
250.20
252.10
9.84
252.10
250.24
250.24
252.20
10.00
252.20
250.28
250.28
252.30
10.16
252.30
250.32
250.32
252.40
10.31
252.40
250.36
250.36
252.50
10.46
252.50
250.40
250.40
252.60
10.61
252.60
250.44
250.44
252.70
10.75
252.70
250.48
250.48
252.80
10.91
252.80
250.52
250.52
252.90
11.04
252.90
250.56
250.56
253.00
11.18
253.00
250.60
250.60
253.10
11.33
253.10
250.64
250.64
253.20
11.46
253.20
250.68
250.68
253.30
11.60
253.30
250.72
250.72
253.40
11.73
253.40
250.76
250.76
253.50
11.86
253.50
250.80
250.80
253.60
11.99
253.60
250.84
250.84
253.70
12.12
253.70
250.88
250.88
253.80
12.25
253.80
250.92
250.92
253.90
12.38
253.90
250.96
250.96
254.00
12.50
254.00
251.00
251.00
Downstream Hydraulic
Grade Line Error
(ft)
Convergence Error Downstream Channel Tailwater Error Message
(ft3 /5) Tailwater (ft)
(ft)
Holding Village J. Shinn, El
5/5/2014

DESIGN OF RIPRAP OUTLET PROTECTION WORKSHEET
Project Holding Village - South Lake Date 24- Jun -14
Project No. RAP -13020 Designer J. Shinn, EI
Outlet ID SWMF'C'
Outlet flowrate
19.18
cfs
Pipe diameter
36
inches
Number of pipes
1
Outlet flowrate
Pipe separation
0
feet
Outlet pipe slope
2
percent
6 in.
1'ieure 8.06.b.1
25
20
15
w_
ZU
O
d 10 se
5 on
0
0 1 2 3 4 5 6 7 8 9 10
Pipe diameter (ft)
Zone from graph above =
2
Diameter
Thickness
Outlet pipe diameter
36 in.
Length =
18.0 ft.
Outlet flowrate
19.2 cfs
Width =
10.2 ft.
Outlet velocity
9.8 ft/sec
Stone diameter =
6 in.
Material =
Class B
Thickness =
18 in.
Zone
Material
Diameter
Thickness
Length
Width
1
Class A
3
12
4 x D(o)
3 x D(o)
2
Class B
6
18
6 x D(o)
3 x D(o)
3
Class I
13
24
8 x D(o)
3 x D(o)
4
Class I
13
24
8 x D(o)
3 x D(o)
5
Class II
23
36
10 x D(o)
3 x D(o)
6
Class II
23
1 36 1
10 x D(o)
3 x D(o)
7
Special study required
1. Calculations based on NY DOT method - Pages 8.06.05 through 8.06.06 in NC Erosion Control Manual
2. Outlet velocity based on full -flow velocity
Stormwater - Velocity Disspator.xlsx
6/24/2014

Permit Number:
(to be provided by DWQ)
Drainage Area Number: G
Filter Strip, Restored Riparian Buffer and Level Spreader
Operation and Maintenance .Agreement
I will keep a maintenance record on this BMP. This maintenance record will be kept in a
log in a known set location. Any deficient BMP elements noted in the inspection will be
corrected, repaired or replaced immediately. These deficiencies can affect the integrity
of structures, safety of the public, and the removal efficiency of the BMP.
Important maintenance procedures:
- Immediately after the filter strip is established, any newly planted vegetation
will be watered twice weekly if needed until the plants become established
(commonly six weeks).
- Once a year, the filter strip will be reseeded to maintain a dense growth of
vegetation
- Stable groundcover will be maintained in the drainage area to reduce the
sediment load to the vegetation.
- Two to three times a year, grass filter strips will be mowed and the clippings
harvested to promote the growth of thick vegetation with optimum pollutant
removal efficiency. Turf grass should not be cut shorter than 3 to 5 inches and
may be allowed to grow as tall as 12 inches depending on aesthetic requirements
(NIPC,1993). Forested filter strips do not require this type of maintenance.
- Once a year, the soil will be aerated if necessary.
- Once a year, soil pH will be tested and lime will be added if necessary.
After the filter strip is established, it will be inspected quarterly and within 24 hours
after every storm event greater than 1.0 inch (or 1.5 inches if in a Coastal County).
Records of operation and maintenance will be kept in a known set location and will be
available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element:
Potential problem:
How I will remediate the problem:
The entire filter strip
Trash /debris is present.
Remove the trash /debris.
system
The flow splitter device
The flow splitter device is
Unclog the conveyance and dispose
(if applicable)
clogged.
of any sediment off -site.
The flow splitter device is
Make any necessary repairs or
damaged.
replace if damage is too large for
re aff.
Form SWU401 -Level Spreader, Filter Strip, Restored Riparian Buffer O &M -Rev.3 Page 1 of 3

BMP element:
Potential problem:
How I will remediate the problem:
The swale and the level
lip
The swale is clogged with
sediment.
Remove the sediment and dispose
of it off -site.
The level lip is cracked,
Repair or replace lip.
settled, undercut, eroded or
otherwise damaged,
There is erosion around the
Regrade the soil to create a berm
end of the level spreader that
that is higher than the level lip, and
shows stormwater has
then plant a ground cover and
bypassed it.
water until it is established. Provide
lime and a one -time fertilizer
application.
Trees or shrubs have begun
Remove them.
to grow on the Swale or just
downslo e of the level Ii p.
The bypass channel
Areas of bare soil and /or
Regrade the soil if necessary to
erosive gullies have formed.
remove the gully, and then
reestablish ro er erosion control.
Turf reinforcement is
Study the site to see if a larger
damaged or ripap is rolling
bypass channel is needed (enlarge if
downhill.
necessary). After this, reestablish
the erosion control material.
The filter strip
Grass is too short or too long
Maintain grass at a height of
(if a licable .
approximately three to six inches.
Areas of bare soil and /or
Regrade the soil if necessary to
erosive gullies have formed.
remove the gully, and then plant a
ground cover and water until it is
established. Provide lime and a
one -time fertilizer application.
Sediment is building up on
Remove the sediment and
the filter strip.
restabilize the soil with vegetation if
necessary. Provide lime and a one-
time fertilizer application.
Plants are desiccated.
Provide additional irrigation and
fertilizer as needed.
Plants are dead, diseased or
Determine the source of the
dying.
problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants. Provide a one -time
fertilizer application.
Nuisance vegetation is
Remove vegetation by hand if
choking out desirable species.
possible. If pesticide is used, do not
allow it to get into the receiving
water.
The receiving water
Erosion or other signs of
Contact the NC Division of Water
damage have occurred at the
Quality local Regional Office, or the
outlet.
401 Oversight Unit at 919 -733 -1786.
Form SWU401 -Level Spreader, Filter Strip, Restored Riparian Buffer O &M -Rev.3 Page 2 of 3

Permit Number:
(to be provided by DWQ)
I acknowledge and agree by my signature below that I am responsible for the
performance of the maintenance procedures listed above. I agree to notify DWQ of any
problems with the system or prior to any changes to the system or responsible party.
Project name:South Lake at Holding Village
BMP drainage area number:
Print name:WSR HV LLC c/o Reader and Partners c/o Mr. Scott LU _
Title:Vice President
Address:8480 Honeycutt Road Suite 200
Phone
Signature:
Date:
Note: The legally responsible party should not be a homeowners association unless more than 50% of
the lots have been sold and a resident of the subdivision has been. named the president.
a Notary Public for the State of
r ,County of 1'}° ' i% _, do hereby certify that
6 d T-3— 2-4-Y personally appeared before me this
day of OR�r L. , a , and acknowledge the due execution of the
forgoing filter strip, riparian buffer, and /or level spreader maintenance requirements.
Witness my hand and official seal,
Holly Van Apeldoorn
Notary Public
Wake County, NC
My Commission Expires June 25, 2017
SEAL
My commission expires
Form SWU401 -Level Spreader, Filter Strip, Restored Riparian Buffer O &M -Rev.3 Page 3 of 3

LEVEL SPREADER `D'
SOUTH LAKE AT HOLDING VILLAGE
RAP-13020

ARA
o`'o�WArF94y
i
NCDENR
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
Holding Village
Contact name
Kevin Yates
Phone number
919- 361 -5000
Date
June 24, 2014
Drainage area number
Sub 3 to SWMF'D'
II. 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
Impervious surface area
Percent impervious
Rational C coefficient
Peak flow from the 1 in /hr storm
Time of concentration
Rainfall intensity, 10- yrstorm
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
230,933 fl?
112,444 fe
48.69 %
0.64
3.40 cfs
5.00 min
7.19 in /hr
24.48 cfs
1 inch /hour storm
3.4 cfs
Y (Y or N)
Do not complete this section of the form.
Pick one:
cfs
cfs Do not complete this section of the form.
10 cfs
cfs Do not complete this section of the form.
(Y or N)
Form SW401 - LS -VFS - 29June2012 - Rev. 10 page 10 of 18

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 level lip provided
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
N/A
sq ft Forebay is adequately sized.
in
in
10
ft/cfs
34
ft
35
ft
30
ft
312.00
fmsl
310.00
fmsl
6.67
%
N
(Y or N) OK
Y
(Y or N)
Y (Y or N)
Y (Y or N) Please provide plan details of flow splitter & supporting calcs.
2.00 ft
6.40 ft
1.20 ft
1.00 ft
6.34 ft/sec
Rip -rap
Y (Y or N) Redesign channel to discharge to a dissipator pad adjacent to the wetlan
Y (Y or N)
W
i B i
Form SW401 - LS -VFS - 29June2012 - Rev. 10 page 11 of 18

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.
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.
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.
Initials Page or plan sheet number and any notes:
Form SW401 - LS -VFS - 29June2012 - Rev.10 page 12 of 18

HOLDING VILLAGE LEVEL SPREADER CALCULATIONS J. SHINN, EI
RAP -13020 Level Spreader D 6/23/2014
LEVEL SPREADER DESIGN
The purpose of the level spreader is to provide a non - erosive outlet by converting concentrated flow
into sheet flow and release it uniformly over the vegetated filter strip. The level spreader length
should be designed such that during the 1 " per hour storm event, a non- erosive velocity (in this case,
10 feet per cfs) is released from the level spreader into the vegetated filter strip.
Hydrology
Drainage Area to Level Spreader
Total Area = 5.30 ac
Impervious Area = 2.58 ac
Rational C Values
Impervious = 0.95
Open Space = 0.35
Rational Method Flow Calculation
C = 0.64
i = 1.00 in /hr
A = 5.30 ac
Q = 3.40 efs
Required Level Spreader Length = 10 LF per cfs
Min. Level Spreader Length = 34.0 feet
SPUTTER SOY DESIGN
The splitter box is designed such that the box provides sufficient driving head to pass the I "per hour
storm event though an orifice plate at the invert of the box without activating the bypass. Flows in
excess of the 1 "per hour storm will be bypassed.
Orifice Equation
Orifice Diameter = 11.00 in
O =Cd *n *r2 *V(2 *g *h)
Cd = 0.6
r = 0.458 ft
g = 32.2 ft/s2
Q = 3.40 cfs
Head from Centroid (h) = 1.15 ft
Min. Bypass Pipe Invert Out = 313.91

HOLDING VILLAGE LEVEL SPREADER CALCULATIONS J. SHINN, El
RAP -13020 LS -D Bypass Channel 6/23/2014
BYPASS CHANNEL DESIGN r
Hydrology
Drainage Area to Splitter Box
Total Area = 5.30 ac
Impervious Area = 2.58 ac
Rational C Values
Impervious = 0.95
Open Space = 0.35
Rational Method Flow Calculation
C = 0.64
i = 7.19 in /hr (10 yr storm)
A = 5.30 ac
Q = 24.48 cfs

Project Description
Friction Method
Solve For
Input Data
LS -D Trapezoidal Channel
Manning Formula
Normal Depth
Roughness Coefficient
0.078
Channel Slope
17.39
%
Left Side Slope
1.00
ft/ft (H:V)
Right Side Slope
1.00
ft/ft (H:V)
Bottom Width
2.00
ft
Discharge
24.48
ft3 /s
Results
Normal Depth
Flow Area
Wetted Perimeter
Hydraulic Radius
Top Width
Critical Depth
Critical Slope
Velocity
Velocity Head
Specific Energy
Froude Number
Flow Type
GVF Input Data
Supercritical
1.20 ft
3.86 ft2
5.41 ft
0.71 ft
4.41 ft
1.33 ft
0.11967 ft/ft
6.34 ft/s
0.63 ft
1.83 ft
1.20
Downstream Depth 0.00 ft
Length 0.00 ft
Number Of Steps 0
GVF Output Data
Upstream Depth
Profile Description
Profile Headloss
Downstream Velocity
Upstream Velocity
Normal Depth
Critical Depth
Channel Slope
Critical Slope
0.00 ft
0.00 ft
Infinity ft/s
Infinity ft/s
1.20 ft
1.33 ft
17.39 %
0.11967 ft/ft
Bentley Systems, Inc. Haestad Methods Solution Cent(Bentley FlowMaster V8i (SELECTseries 1) [08.11.01.03]
6/23/2014 2:40:20 PM 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1- 203 - 755 -1666 Page 1 of 1

Permit Number:
(to be provided by DWQ)
Drainage Area Number: 16
Filter Strip, Restored Riparian Buffer and Level Spreader
Operation. and Maintenance Agreement
I will keep a maintenance record on this BMP. This maintenance record will be kept in a
log in a known set location. Any deficient BMP elements noted in the inspection will be
corrected, repaired or replaced immediately. These deficiencies can affect the integrity
of structures, safety of the public, and the removal efficiency of the BMP.
Important maintenance procedures:
Immediately after the filter strip is established, any newly planted vegetation
will be watered twice weekly if needed until the plants become established
(commonly six weeks).
— Once a year, the filter strip will be reseeded to maintain a dense growth of
vegetation
— Stable groundcover will be maintained in the drainage area to reduce the
sediment load to the vegetation.
— Two to three times a year, grass filter strips will be mowed and the clippings
harvested to promote the growth of thick vegetation with optimum pollutant
removal efficiency. Turf grass should not be cut shorter than 3 to 5 inches and
may be allowed to grow as tall as 12 inches depending on aesthetic requirements
(NIPC,1993). Forested filter strips do not require this type of maintenance.
— Once a year, the soil will be aerated if necessary.
— Once a year, soil pH will be tested and lime will be added if necessary.
After the filter strip is established, it will be inspected quarterly and within 24 hours
after every storm event greater than 1.0 inch (or 1.5 inches if in a Coastal County).
Records of operation and maintenance will be kept in a known set location and will be
available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element:
Potential problem:
How I will remediate the problem:
The entire filter strip
Trash / debris is present.
Remove the trash/ debris.
system
The flow splitter device
The flow splitter device is
Unclog the conveyance and dispose
(if applicable)
clogged.
of any sediment off -site.
The flow splitter device is
Make any necessary repairs or
damaged.
replace if damage is too large for
repair.
Form SWU401 -Level Spreader, Filter Strip, Restored Riparian Buffer O &M -Rev.3 Page 1 of 3

BMP element:
Potential problem:
How I will remediate the problem:
The swale and the level
The swale is clogged with
Remove the sediment and dispose
lip
sediment.
of it off -site.
The level lip is cracked,
Repair or replace lip.
settled, undercut, eroded or
otherwise damaged.
There is erosion around the
Regrade the soil to create a berm
end of the level spreader that
that is higher than the level lip, and
shows stormwater has
then plant a ground cover and
bypassed it.
water until it is established. Provide
lime and a one -time fertilizer
a lication.
Trees or shrubs have begun
Remove them.
to grow on the Swale or just
downslo e of the level lip.
The bypass channel
Areas of bare soil and /or
Regrade the soil if necessary to
erosive gullies have formed.
remove the gully, and then
reestablish proper erosion control.
Turf reinforcement is
Study the site to see if a larger
damaged or ripap is rolling
bypass channel is needed (enlarge if
downhill.
necessary). After this, reestablish
the erosion control material.
The filter strip
Grass is too short or too long
Maintain grass at a height of
(if applicable),
approximately three to six inches.
Areas of bare soil and /or
Regrade the soil if necessary to
erosive gullies have formed.
remove the gully, and then plant a
ground cover and water until it is
established. Provide lime and a
one -time fertilizer application.
Sediment is building up on
Remove the sediment and
the filter strip.
restabilize the soil with vegetation if
necessary. Provide lime and a one-
time fertilizer application.
Plants are desiccated.
Provide additional irrigation and
fertilizer as needed.
Plants are dead, diseased or
Determine the source of the
dying.
problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants. Provide a one -time
fertilizer a plication.
Nuisance vegetation is
Remove vegetation by hand if
choking out desirable species.
possible. If pesticide is used, do not
allow it to get into the receiving
water.
The receiving water
Erosion or other signs of
Contact the NC Division of Water
damage have occurred at the
Quality local Regional Office, or the
outlet.
401 Oversight Unit at 919 - 733 -1786.
Form SWU401 -Level Spreader, Filter Strip, Restored Riparian Buffer O &M -Rev.3 Page 2 of 3

Permit Number:
(to be provided by DWQ)
I acknowledge and agree by my signature below that I am responsible for the
performance of the maintenance procedures listed above. I agree to notify DWQ of any
problems with the system or prior to any changes to the system or responsible party.
Project name:South Lake at Holding Village
BMP drainage area number:
Print name:WSR HV LLC c/o Reader and Partners c/o Mr. Scott Lay
Title:Vice President
Address:8480 Honeycutt Road Suite 200 _
Phone: [phone]//
Signature:
Date:
Note: The legally responsible party should not be a homeowners association unless more than 50% of
the lots have been sold and a resident of the subdivision has been named the president.
a Notary Public for the State of
Y) AT)� e, 4V ,dj:�7 )44, County of 1 _, do hereby certify that
6 d T7— 2-74 k personally appeared before me this c �'
day of RY L , and acknowledge the due execution of the
forgoing filter strip, riparian buffer, and /or level spreader maintenance requirements.
Witness my hand and official seal,
Holly Van Apeldoorn
Notary Public
Wake County, NC
Commission Expires June 25, 2017
SEAL
My commission expires
Form SWU401 -Level Spreader, Filter Strip, Restored Riparian Buffer O &M -Rev.3 Page 3 of 3

LEVEL SPREADER `E'
SOUTH LAKE AT HOLDING VILLAGE
RAP -13020

T � ' •
0`'0� WArF9oy
y r
NCDENR
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
Holding Village
Contact name
Kevin Yates
Phone number
919 - 361 -5000
Date
June 24, 2014
Drainage area number
Sub 4 to SWMF'E'
II. 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
389,550 fe
Impervious surface area
228,448 ft
Percent impervious
58.64 %
Rational C coefficient
0.70
Peak flow from the 1 in /hr storm
6.28 cfs
Time of concentration
5.00 min
Rainfall intensity, 10 -yr storm
7.19 in /hr
Peak flow from the 10 -yr storm
45.13 cfs
Design storm
1 inch /hour storm
Maximum amount of flow directed to the LS -VFS
6.28 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
Form SW401 - LS -VFS - 29June2012 - Rev. 10 page 13 of 18

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 level lip provided
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
N/A
sq ft Forebay is adequately sized.
5.00
in
9.00
in
10
ft/cfs
63
ft
70
ft
30
ft
312.00
fmsl
310.00
fmsl
6.67
%
N
(Y or N) OK
Y
(Y or N)
Y (Y or N)
Y (Y or N) Please provide plan details of flow splitter & supporting calcs.
1.00
ft
5.00
ft
9.00
ft
0.98
ft
1.02
ft
7.69
fl/sec
Rip -rap
N (Y or N)
Y (Y or N)
'fir
(t V
1 B 1
Form SW401 - LS -VFS - 29June2012 - Rev.10 page 14 of 18

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.
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.
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 suppdrting calculations.
8. A copy of the signed and notarized operation and maintenance (0 &M) agreement.
Initials Page or plan sheet number and any notes:
Form SW401 - LS -VFS - 29June2012 - Rev.10 page 15 of 18

HOLDING VILLAGE LEVEL SPREADER CALCULATIONS J. SHINN, El
RAP -13020 Level Spreader E 6/23/2014
LEVEL SPREADER DESIGN
The purpose of the level spreader is to provide a non - erosive outlet by converting concentrated flow
into sheet flow and release it uniformly over the vegetated filter strip. The level spreader length
should be designed such that during the 1 "per hour storm event, a non- erosive velocity (in this case,
10 feet per cfs) is released from the level spreader into the vegetated filter strip.
Hydrology
Drainage Area to Level Spreader
Total Area = 8.94 ac
Impervious Area = 5.24 ac
Rational C Values
Impervious = 0.95
Open Space = 0.35
Rational Method Flow
C=
i=
A=
Q=
Required Level Spreader Length =
Min. Level Spreader Length =
7alculation
0.70
1.00 in /hr
8.94 ac
6.28 cfs
10 LF per cfs
62.8 feet
SPUTTER BOX DESIGN
The splitter box is designed such that the box provides sufficient driving head to pass the I "per hour
storm event though an orifice plate at the invert of the box without activating the bypass. Flows in
excess of the I "per hour storm will be bypassed.
Orifice Equation
Orifice Diameter = 14.00 in
O =Cd * r[ *r2 * V(2 *g *h)
Cd =
0.6
r=
0.583
ft
g =
32.2
ft/s2
Q =
6.28
cfs
Head from Centroid (h) =
1.49
ft
Min. Bypass Pipe Invert Out = 314.37

HOLDING VILLAGE LEVEL SPREADER CALCULATIONS J. SHINN, EI
RAP -13020 LS -E Bypass Channel 6/23/2014
BYPASS CHANNEL DESIGN
Hydrology
Drainage Area to Splitter Box
Total Area = 8.94 ac
Impervious Area = 5.24 ac
Rational C Values
Impervious = 0.95
Open Space = 0.35
Rational Method Flow Calculation
C = 0.70
i = 7.19 in /hr (10 yr storm)
A = 8.94 ac
Q = 45.13 cfs

Project Description
Friction Method
Solve For
Input Data
LS -E Trapezoidal Channel
Manning Formula
Normal Depth
Roughness Coefficient
0.078
Channel Slope
23.73
%
Left Side Slope
1.00
ft/ft (H:V)
Right Side Slope
1.00
ft/ft (H:V)
Bottom Width
5.00
ft
Discharge
45.13
ft3 /s
Results
Normal Depth
Flow Area
Wetted Perimeter
Hydraulic Radius
Top Width
Critical Depth
Critical Slope
Velocity
Velocity Head
Specific Energy
Froude Number
Flow Type
GVF Input Data
Supercritical
0.98 ft
5.87 ftz
7.77 ft
0.75 ft
6.96 ft
1.25 ft
0.10394 ft/ft
7.69 ft/s
0.92 ft
1.90 ft
1.48
Downstream Depth 0.00 ft
Length 0.00 ft
Number Of Steps 0
GVF Output Data ?
Upstream Depth
Profile Description
Profile Headloss
Downstream Velocity
Upstream Velocity
Normal Depth
Critical Depth
Channel Slope
Critical Slope
0.00 ft
0.00 ft
Infinity ft/s
Infinity ft/s
0.98 ft
1.25 ft
23.73 %
0.10394 ft/ft
Bentley Systems, Inc. Haestad Methods Solution Cent(Bentley FlowMaster V8i (SELECTseries 1) [08.11.01.03]
612312014 2:40:01 PM 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA [phone] Page 1 of 1

Permit Number:
(to be provided by DWQ)
Drainage Area Number:__
Filter Strip, Restored Riparian Buffer and Level Spreader
Operation and Maintenance Agreement
I will keep a maintenance record on this BMP. This maintenance record will be kept in a
log in a known set location. Any deficient BMP elements noted in the inspection will be
corrected, repaired or replaced immediately. These deficiencies can affect the integrity
of structures, safety of the public, and the removal efficiency of the BMP.
Important maintenance procedures:
— Immediately after the filter ship is established, any newly planted vegetation
will be watered twice weekly if needed until the plants become established
(commonly six weeks).
— Once a year, the filter strip will be reseeded to maintain a dense growth of
vegetation
— Stable groundcover will be maintained in the drainage area to reduce the
sediment load to the vegetation.
— Two to three times a year, grass filter strips will be mowed and the clippings
harvested to promote the growth of thick vegetation with optimum pollutant
removal efficiency. Turf grass should not be cut shorter than 3 to 5 inches and
may be allowed to grow as tall as 12 inches depending on aesthetic requirements
(NIPC,1993). Forested filter strips do not require this type of maintenance.
— Once a year, the soil will be aerated if necessary.
— Once a year, soil pH will be tested and lime will be added if necessary.
After the filter strip is established, it will be inspected quarterly and within 24 hours
after every storm event greater than 1.0 inch (or 1.5 inches if in a Coastal County).
Records of operation and maintenance will be kept in a known set location and will be
available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element:
Potential problem:
How I will remediate the problem:
The entire filter strip
Trash /debris is present.
Remove the trash/ debris.
system
The flow splitter device
The flow splitter device is
Unclog the conveyance and dispose
(if applicable)
clogged.
of any sediment off -site.
The flow splitter device is
Make any necessary repairs or
damaged.
replace if damage is too large for
repair.
Form SWU401 -Level Spreader, Filter Strip, Restored Riparian Buffer O &M -Rev.3 Page 1 of 3

BMP element:
Potential problem:
How I will remediate the problem:.._
The swale and the level
The Swale is clogged with
Remove the sediment and dispose
lip
sediment.
of it off -site.
The level lip is cracked,
Repair or replace lip.
settled, undercut, eroded or
otherwise damaged.
There is erosion around the
Regrade the soil to create a berm
end of the level spreader that
that is higher than the level lip, and
shows stormwater has
then plant a ground cover and
bypassed it.
water until it is established. Provide
lime and a one -time fertilizer
a lication.
Trees or shrubs have begun
Remove them.
to grow on the swale or just
downslo e of the level lip.
The bypass channel
Areas of bare soil and /or
Regrade the soil if necessary to
erosive gullies have formed.
remove the gully, and then
reestablish proper erosion control.
Turf reinforcement is
Study the site to see if a larger
damaged or ripap is rolling
bypass channel is needed (enlarge if
downhill.
necessary). After this, reestablish
the erosion control material.
The filter strip
Grass is too short or too long
Maintain grass at a height of
(if applicable).
approximately three to six inches.
Areas of bare soil and /or
Regrade the soil if necessary to
erosive gullies have formed.
remove the gully, and then plant a
ground cover and water until it is
established. Provide lime and a
one -time fertilizer application.
Sediment is building up on
Remove the sediment and
the filter strip.
restabilize the soil with vegetation if
necessary. Provide lime and a one-
time fertilizer application.
Plants are desiccated.
Provide additional irrigation and
fertilizer as needed.
Plants are dead, diseased or
Determine the source of the
dying.
problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants. Provide a one -time
fertilizer application.
Nuisance vegetation is
Remove vegetation by hand if
choking out desirable species.
possible. If pesticide is used, do not
allow it to get into the receiving
water.
The receiving water
Erosion or other signs of
Contact the NC Division of Water
damage have occurred at the
Quality local Regional Office, or the
outlet.
401 Oversight Unit at 919 -733 -1786.
Form SWU401 -Level Spreader, Filter Strip, Restored Riparian Buffer O &M -Rev.3 Page 2 of 3

Permit Number:
(to be provided by DWQ)
I acknowledge and agree by my signature below that I am responsible for the
performance of the maintenance procedures listed above. I agree to notify DWQ of any
problems with the system or prior to any changes to the system or responsible party.
Project name:South Lake at Holding Village
BMP drainage area number:
Print name:WSR HV LLC c/o Reader and Partners c/o NIr. Scott Lay
Title:Vice President
Address:8480 Honeycutt Road Suite 200
Phone: [phone]Q79� .7
Signature:
Note: The legally responsible party should not be a homeowners association unless more than 50% of
the lots have been sold and a resident of the subdivision has been named the president.
a Notary Public for the State of
d A T)' 6 Y,aO y1 , County of 1 3 ° , do hereby certify that
_ 6 C T_)— 2 4 Y personally appeared before me this J
day of 00--p L- and acknowledge the due execution of the
forgoing filter strip, riparian buffer, and /or level spreader maintenance requirements.
Witness my hand and official seal,
Holly Van Apeldoorn
Notary Public
Wake County, NC
Commission Expires June 25, 2017
v4j
SEAL
My commission expires_ Cif
Form SWU401 -Level Spreader, Filter Strip, Restored Riparian Buffer O &M -Rev.3 Page 3 of 3

LEVEL SPREADER `F'
SOUTH LAKE AT HOLDING VILLAGE
RAP -13020

e��
OapF W ATF9QG
y
<
NCDENR
P
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.
1. PROJECT INFORMATION
Project name
Holding Village
Contact name
Kevin Yates
Phone number
919- 361 -5000
Date
June 24, 2014
Drainage area number
Sub 5 to SWMF'F'
II. 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
479,160 ft
Impervious surface area
435,600 fe
Percent impervious
90.91 %
Rational C coefficient
0.90
Peak flow from the 1 in /hr storm
9.85 cfs
Time of concentration
5.00 min
Rainfall intensity, 10- yrstorm
7.19 in /hr
Peak flow from the 10 -yr storm
70.82 cfs
Design storm
1 inch /hour storm
Maximum amount of flow directed to the LS -VFS 9.85 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
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
Do not complete this section of the form.
Pick one:
cfs
cfs Do not complete this section of the form.
10 cfs
cis Do not complete this section of the form.
(Y or N)
Form SW401 - LS -VFS - 29June2012 - Rev. 10 page 16 of 18

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 level lip provided
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
N/A
sq ft Forebay is adequately sized.
in
in
10
fucfs
99
ft
100
ft
30
ft
304.00
fmsl
302.00
fmsl
6.67
%
N
(Y or N) OK
Y
(Y or N)
Y (Y or N)
Y (Y or N) Please provide plan details of flow splitter & supporting calcs.
5.00 ft
10.20 ft
1.53 ft
1.07 ft
7.06 ft/sec
Rip -rap
N (Y or N)
Y (Y or N)
1�1
1 B 1
Form SW401 - LS -VFS - 29June2012 - Rev. 10 page 17 of 18

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.
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.
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.
Initials Page or plan sheet number and any notes:
Form SW401 - LS -VFS - 29June2012 - Rev. 10 page 18 of 18

HOLDING VILLAGE LEVEL SPREADER CALCULATIONS J. SHINN, EI
RAP -13020 Level Spreader F 6/23/2014
LEVEL SPREADER DESIGN
The purpose of the level spreader is to provide a non - erosive outlet by converting concentrated flow
into sheetflow and release it uniformly over the vegetated filter strip. The level spreader length
should be designed such that during the 1 "per hour storm event, a non- erosive velocity (in this case,
10 feet per cfs) is released from the level spreader into the vegetated filter strip.
Hydrology
Drainage Area to Level Spreader*
Total Area = 11.00 ae
Impervious Area = 10.00 ae
Rational C Values
Impervious =
0.95
Open Space =
0.35
Rational Method Flow Calculation
C =
0.90
i =
1.00 in /hr
A =
11.00 ac
Q =
9.85 cfs
Required Level Spreader Length = t0 LF per cfs
Min. Level Spreader Length = 98.5 feet
*Note: Drainage area hydrology assumed for future condition.
SPLPTTER BOX DESIGN
The splitter box is designed such that the box provides sufficient driving head to pass the ]"per hour
storm event though an orifice plate at the invert of the box without activating the bypass. Flows in
excess of the 1 "per hour storm will be bypassed.
Orifice Equation
Orifice Diameter = 14.00 in
Q —Cd * n *r2 *V(2 *g *h)
Cd = 0.6
r = 0.583 ft
g = 32.2 ft /s2
Q = 9.85 cfs
Head from Centroid (h) = 3.66 ft
Min. Bypass Pipe Invert Out = 4.25

HOLDING VILLAGE LEVEL SPREADER CALCULATIONS J. SHINN, El
RAP -13020 LS -F Bypass Channel 6/23/2014
BYPASS CHANNEL DESIGN
Hydrology
Drainage Area to Splitter Box
Total Area = 11.00 ac
Impervious Area = 10.00 ac
Rational C Values
Impervious = 0.95
Open Space = 0.35
Rational Method Flow Calculation
C = 0.90
i = 7.19 in /hr (10 yr storm)
A= 11.00 ac
Q = 70.82 efs

LS -F Trapezoidal Channel
Project Description
Friction Method
Solve For
Input Data
Manning Formula
Normal Depth
Roughness Coefficient
0.078
Channel Slope
12.50
%
Left Side Slope
1.00
ft/ft (H:V)
Right Side Slope
1.00
ft/ft (H:V)
Bottom Width
5.00
ft
Discharge
70.82
ft3 /s
Results
Normal Depth
Flow Area
Wetted Perimeter
Hydraulic Radius
Top Width
Critical Depth
Critical Slope
Velocity
Velocity Head
Specific Energy
Froude Number
Flow Type
GVF',Input Data
Supercritical
1.53 ft
10.03 ftz
9.34 ft
1.07 ft
8.07 ft
1.64 ft
0.09909 ft/ft
7.06 ft/s
0.77 ft
2.31 ft
1.12
Downstream Depth 0.00 ft
Length 0.00 ft
Number Of Steps 0
GVF'Output Data
Upstream Depth
Profile Description
Profile Headloss
Downstream Velocity
Upstream Velocity
Normal Depth
Critical Depth
Channel Slope
Critical Slope
0.00 ft
0.00 ft
Infinity ft/s
Infinity ft/s
1.53 ft
1.64 ft
12.50 %
0.09909 ft/ft
Bentley Systems, Inc. Haestad Methods Solution Cent(Bentley FlowMaster V8i (SELECTseries 1) [08.11.01.03]
6/23/2014 2:39:41 PM 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA [phone] Page 1 of 1

Permit Number:
(to be provided by DWQ)
Drainage Area Number: P _
Filter Strip, Restored Riparian Buffer and Level Spreader
Operation and Maintenance Agreement
I will keep a maintenance record on this BMP. This maintenance record will be kept in a
log in a known set location. Any deficient BMP elements noted in the inspection will be
corrected, repaired or replaced immediately. These deficiencies can affect the integrity
of structures, safety of the public, and the removal efficiency of the BMP.
Important maintenance procedures:
— Immediately after the filter strip is established, any newly planted vegetation
will be watered twice weekly if needed until the plants become established
(commonly six weeks).
— Once a year, the filter strip will be reseeded. to maintain a dense growth of
vegetation
— Stable groundcover will be maintained in the drainage area to reduce the
sediment load to the vegetation.
— Two to three times a year, grass filter strips will be mowed and the clippings
harvested to promote the growth of thick vegetation with optimum pollutant
removal efficiency. Turf grass should not be cut shorter than 3 to 5 inches and
may be allowed to grow as tall as 12 inches depending on aesthetic requirements
(NIPC,1993). Forested filter strips do not require this type of maintenance.
— Once a year, the soil will be aerated if necessary.
— Once a year, soil pH will be tested and lime will be added if necessary.
After the filter strip is established, it will be inspected quarterly and within 24 hours
after every storm event greater than 1.0 inch (or 1.5 inches if in a Coastal County).
Records of operation and maintenance will be kept in a known set location and will be
available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element:
Potential problem:
How I will remediate the problem:
The entire filter strip
Trash / debris is present.
Remove the trash / debris.
system
The flow splitter device
The flow splitter device is
Unclog the conveyance and dispose
(if applicable)
clogged.
of any sediment off -site.
The flow splitter device is
Make any necessary repairs or
damaged.
replace if damage is too large for
repair.
Form SWU401 -Level Spreader, Filter Strip, Restored Riparian Buffer O &M -Rev.3 Page 1 of 3

BMP element:
Potential problem:
How I will remediate the problem:
The Swale and the level
The swale is clogged with
Remove the sediment and dispose
lip
sediment.
of it off -site.
The level lip is cracked,
Repair or replace lip.
settled, undercut, eroded or
otherwise damaged.
There is erosion around the
Regrade the soil to create a berm
end of the level spreader that
that is higher than the level lip, and
shows stormwater has
then plant a ground cover and
bypassed it.
water until it is established. Provide
lime and a one -time fertilizer
a lication.
Trees or shrubs have begun
Remove them.
to grow on the swale or just
downslo e of the level lip.
The bypass channel
Areas of bare soil and /or
Regrade the soil if necessary to
erosive gullies have formed.
remove the gully, and then
reestablish proper erosion control.
Turf reinforcement is
Study the site to see if a larger
damaged or ripap is rolling
bypass channel is needed (enlarge if
downhill.
necessary). After this, reestablish
the erosion control material.
The filter strip
Grass is too short or too long
Maintain grass at a height of
(if applicable).
approxim atel three to six inches.
Areas of bare soil and /or
Regrade the soil if necessary to
erosive gullies have formed.
remove the gully, and then plant a
ground cover and water until it is
established. Provide lime and a
one -time fertilizer application.
Sediment is building up on
Remove the sediment and
the filter strip.
restabilize the soil with vegetation if
necessary. Provide lime and a one-
time fertilizer application.
Plants are desiccated.
Provide additional irrigation and
fertilizer as needed.
Plants are dead, diseased or
Determine the source of the
dying.
problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants. Provide a one -time
fertilizer application.
Nuisance vegetation is'
Remove vegetation by hand if
choking out desirable species.
possible. If pesticide is used, do not
allow it to get into the receiving
water.
The receiving water
Erosion or other signs of
Contact the NC Division of Water
damage have occurred at the
Quality local Regional Office, or the
outlet.
401 Oversight Unit at 919- 733 -1786.
Form SWU401 -Level Spreader, Filter Strip, Restored Riparian Buffer O &M -Rev.3 Page 2 of 3

Permit Number:
(to be provided by DWQ)
I acknowledge and agree by my signature below that I am responsible for the
performance of the maintenance procedures listed above. I agree to notify DWQ of any
problems with the system or prior to any changes to the system or responsible party.
Project name:South Lake at Holding Village
BMP drainage area number: F
Print name:WSR HV LLC c/o Reader and Partners c/o Mr. Scott Lay
Title:Vice President
Address:8480 Honeycutt Road Suite 200
Phone:91.9-
Signature:
Date:
Note: The legally responsible party should not be a homeowners association unless more than 50% of
the lots have been sold and a resident of the subdivision has been named the president.
A , a Notary Public for the State of
County of fi , do hereby certify that
6 d T-�- 4 �_ personally appeared before me this
day of kj�� L am , and acknowledge the due execution of the
forgoing filter strip, riparian buffer, and /or level spreader maintenance requirements.
Witness my hand and official seal,
Holly Van Apeldoorn
Notary Public
Wake County, NC
My Commission Expires .tune 25, 2017
via
SEAL
My commission expires_
Form SWU401 -Level Spreader, Filter Strip, Restored Riparian Buffer O &M -Rev.3 Page 3 of 3