SW6110803_401 Certification Application_20110829

NC ENR
Permit Number:
(to be provided by OM)
O2�p W Arf
y T
r
O
51 UKMWA 1 tK MANAGtMtN I YtKMI1 AYYLIGA I IUN tUKM
401 CERTIFICATION APPLICATION FORM
GRASSED SWALE SUPPLEMENT
This form must be filled out, printed and submitted.
The Required Items Checklist (Part 111) must also be filled out, printed and submitted along with all of the required information.
L PROJECT INFORMATION
Project name
Tumberry, Section 1
Contact name
Gregory Floyd
Phone number
[phone]
.Data
May 26, 2011
Drainage area number
2
She Characteristics
Drainage area
178,596.00 ft'
Impervious area
30,990.25 it'
Percent impervious
17.4% %
Design rainfall depth
3.00 inch
Peak Flow Calculations
10-yr storm runoff depth
3.00
in .
10-yr storm intensity
3.10
in/hr
Post -development 10-yr storm peak flow
8.75
ff'/sec
Velocity
Maximum non -erosive velocity (peak 10-year stone)
5.50 ftlsec
Soil characteristics (enter Y below) .
Sand/silt (easily erodible)
Clay mix (erosion resistant)
X
Grass Type (enter Y below)
Bermuda
Tall fescue
x
Bahiagrass
Kentucky bluegrass
Grass -legume mixture
Swale type: Fill out one of the options below.
Option 1: Curb Outlet Swale:
N
(Y or N)
Maximum velocity
1.00
Side slopes
5.00
:1
Swale length
450.00
it
Option 2: Conveyance Swale, Seeking Pollutant Credit:
Y
(Y or N)
Maximum velocity for 10-yr storm
0.98
it/sec OK
Side slopes
5.00
:1 OK
Swale length
450.00
It OK

Pernit Number:
(to be provided by DWQ)
Swale Characteristics
Swale Shape: Enter an in the appropriate cell below:
Trapezoidal X
Parabolic
V-shaped.
Width of the bottom of the swale 3.00 ft
Width of the top of the swale 23.00 It
Additional Information
Is the swale sized for all runoff from ultimate build -out?
Y (Y or N)
OK
Is the BMP located in a proposed drainage easement with a
Y (Y or N)
OK
recorded access easement to a public Right of Way (ROW)?
What is the distance from the bottom of the swale to the SHWT?
2.00 ft
OK
What is the ground level elevation?
224.00 fmsl
What is the elevation of the bottom of the swale?
222.00 fmsl
What is the SHWT elevation?
220.00 fmsl
What is the longitudinal slope of the swale?
4.67 %
OK
What is the depth of freeboard?
0.93 ft
OK

Permit No:
(to be assigned by D WQ)
III. REQUIRED ITEMS CHECKLIST
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package
will result in 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
Wow. If a requirement has not been met, attach justification.
Initials Pagel Plan
Sheet No.
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),
- Swale dimensions (width, length, depth),
- Maintenance access,
- Proposed drainage easement and public right of way (ROW),
- Grass species, and
- Boundaries of drainage easement.
2. Plan details (1" = 59 or larger) for the grassed swale showing:
- Swale dimensions (width, length, depth),
- Maintenance access,
- Proposed drainage easement and public right of way (ROW),
- Design at ultimate build -out,
- Grass species,
- Off -site drainage (if applicable),and
- Boundaries of drainage easement.
3. Section view of the grassed swale (1" = 20' or larger) showing:
- Side slopes,
- Longitudinal slope,
- Freeboard
- Swale dimensions, and
- SHWT level(s)
4. Supporting calculations (including maximum velocity calculations for applicable storms)
5. A copy of the signed and notarized operation and maintenance (O&M) agreement.
�� 6. A copy of the deed restrictions (if required).

r
LTMWA
ENR
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
Tumberry Section 1
Contact name
Gregory Floyd
Phone number
[phone]
Dale
.May.26, 2011
Drainage area number
2
The purpose of the LS-VFS
SWmwrdler enters LS-VFS from
Type of VFS
Explanation of any responses above
N Slormwater Enters the LS-VFS from the Drainage Area
Drainage area
Impervious surface area
Percent impervious
Rational C coefficient
Peak How from the 1 inmr storm
Time of concentration
Rainfall intensity, 10-yr storm
Peak flow from the 10-yr storm
Design storm
Maximum amount of flow directed to the LS-VFS
Is a flow bypass system gang to be used?
Explanation of any'OBer responses above
ff Stormwrater Enters the LS-VFS from a BMP
Type of BMP
Peak discharge from the BMP during the design storm
Peals discharge from the BMP during the 10-year storm
Maximum capacity of a 100-foot long LS-VFS
Peak flow directed to the LS-VFS
Is a flow bypass system going to be used?
Explanation of any 'Other responses above
LS-VFS Design
Forebay surface area
Depth of forebay at stormwater entry point
Depth of forebay at stormwater exit pant
Feet of level lip needed per cfs
Computed minimum length of the level lip needed
Pollutant removal: 40%TSS, 30%TN, 35%TP
-BMP
Engineered filter strip (graded
& sodded, slope < 8%)
178,596
fe
Do not complete this section of the form.
30,9W-
ff
Do not complete this section at the forth.
17.35
%
Do not complete this section of the form.
Do not complete this section of the form.
cis
Do not complete this section of the form.
min
Do not complete this section of the forth.
iNhr
Do not complete this section of the forth.
CIS
Do not complete this section of the forth.
CIS
Do not complete this section of the forth.
(Y or N)
Do not complete this section of the form.
Other. Explained below
8.75
cis
8.75
CIS
10
CIS
8.751
CIS
N
(Y or N)
Grassed Swale
62
sq It No forebay is required.
18
in Depth is appropriate.
12
in Depth is appropdate.
10
Iticfs
88
It
Forn SW401 - LS-VFS - 2gNov2010 - Rev.e page 1 of 3

Length of level lip provided
88
It
Wk th of VFS
30
it
Elevation at downslope base of level lip
223.00
fmsl
Elevation at the end of the VFS that is farthest from the LS
222.50
fmsl
Slope (from level lip to the end of the VFS)
1.67
%
Are any draws present in the VFS?
,- n
(Y or N)
Is there a collector swale at the end of the VFS?
n
(Y or N)
Bypass System Design (if applicable)
Is a bypass system provided? n _ (Y or N)
Is there an engineered flow splitting device? n (Y or N)
Dimensions of the channel (see diagram below):
M It
W
If
y (flaw depth for 10-year storm)
ft
freeboard (during the 10-year storm)
ft
Peak velocity in the channel during the 10-yr storm
ttsec
Channel lining material
Pick one:
Does the bypass discharge through a wetland?
(Y or N)
Does the channel enter the stream at an angle?
(Y or N)
Explanation of any 'Other' responses above
i B i
111. REQUIRED ITEMS CHECKLIST
K3
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. it a requirement has not been met, attach
justification.
Requried Item:
1. Plans (1' - 59 or larger) of the entire site showing:
- Design at ultimate build -out,
- Of -site drainage (f applicable),
- Delineated drainage basins (include Rational C coefficient per basin),
- Forebay (it applicable),
- High flow bypass system,
- Maintenance access,
- Proposed drainage easement and public right of way (ROW), and
- Boundaries of drainage easement
Form SW401 - LS-VFS - 29Nov2010 - Rev.8 page 2 of 3

�/
2. Plan details (l' = 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 buil"ut
3. Section view of the level spreader (V = 20' or larger) showing:.
- Underdram system (if applicable),
-Level lip,
- Upslope channel, and
- Dowrtsbpe fitter fabric.
4. Plan details of the flow splitting device and supporting calculations (if applicable). w
5. A construction sequence that shows how the level spreader willbe protected from
sediment until the entire drainage area is stabilized.
6. 9 a non -engineered VFS is being used, then provide a photograph of the VFS.showing .
that no draws are present
7. The supporting calculations.
S. A ropy of the signed and rutan¢ed operation and maintenance (O&M) agreement
R
4
Form SW401 - LS-VFS - 29Nov2010 - Rev.8 page 3 of 3

Permit No.
(to be mWded by DM)
O2ot WAZS;g
HMENR� r
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
WET DETENTION BASIN SUPPLEMENT
This form must be filled out, printed and submitted.
The Required Items Checklist (Part III) must be printed, filled out and submitted along with all of the required Information.
Project name
Contact person
Phone number
Date
Drainage area number
II. DESIGN INFORMATION -
Site Characteristics
Drainage area
Impervious area, post -development
%Impervious
Design rainfall depth
Storage Volume: Non -SA Waters
Minimum volume required
Volume provided
Storage Volume: SA Waters
1-5' runoff volume
Pre -development 1-yr, 24-hr runoff
Post -development 1-yr, 24-hr runoff
Minimum volume required
Volume provided
Peak Flow Calculations
Is the pre/post control of the tyr 24hr storm peak flow required?
1-yr, 24-hr rainfall depth
Rational C, pre -development
Rational C, post -development
Rainta0 aratrrsty: l yr, 24-hr Shrum
Predevelopment 1-yr, 24-hr peak flow
Post -development 1-yr, 24-hr peak flow
Pre/Post 1-yr, 24-hr peak flow control
Elevations
Temporary pool elevation
Permanent pool elevation
SHWT elevation (approx. at the perm. pool elevation)
Top of 1011 vegetated shelf elevation
Bottom of 10ft vegetated shelf elevation
Sediment deanout top elevation (bottom of pond)
Seel mend dearrout, bottom elevation
Sediment storage provided
Is there additional volume stored above the state-rsquired temp, pool?
Elevation of the top of the additional volume
Farm SM4101-Wel Delenbon eaam-ilev.9-911710e
2,196,282 fe
878,513 fe
40.00 %
1.0 in
75,040 fe
79,013 hi
to
8
fl3
Y (Y or N)
3.1 in
Floyd
OK
OK, volume provided is equal to or in excess of volume required.
0.40 (uni less)
0,65 (tentless)
3.00 Whir OK
0.18 felsec
8.05,fe/sec
7.87 fe/sec
236.30 fmsl
234.50 frrxsl
234.50 fmsl
235.00 imsl
234.00 im91
227.00 hid
226.00 hest
1.00 8
n (Y or N)
Tmsl
Parts 1, a H. Deelen Summery, Page 1 or 2

Permit No.
(to be prOVfOW by DWG)
Ill. DESIGN INFORMATION
Surface Areas
Area, temporary pool
46,094 fe
Area REQUIRED,permanent pool
35,141 fitz
SAIDA ratio
1.60 limitless)
Area PROVIDED, permanent pool, 4..nm
35,150 fe OK
Area, bottom of 100 vegetated shelf, 4, ,
29,751 fe
Area, sediment deanout, top elevation (bottom of pond), @x�„4
19,455-le
Volumes
Volume, temporary pool
79,013 fe OK
Volume, permanent pool, �,,,,,,
201,627 fe
Volume, forebay (sum of forebays If more than one forebey)
40,714 f?
Forebay %of permanent pool volume
20.2% % OK
SAIDA Table Data
Design TSS removal
Coastal SAIDA Table Used?
MountairdPiedmont SAIDA Table Used?
SAIDA ratio
Average depth (used in SAIDA table):
Calculation option 1 used? (See Figure 10-2b)
Volume, permanent pod, 1 ._pay
Area provided, permanent pod, 7..,
90 %
N (Y or N)
Y (Y or N)
1.60 (uri tless)
n (Y or N)
201,627 fe
35,150 to
Average depth calculated.
It Need 3 ft min.
Average depth used in SAIDA, rL (Round to nearest 0.5ft)
It
Calculation option 2 used? (See Figure 10-2b)
y (Y or N)
Area paw", permanent pod, �._pw
35,150 fe
Area, bottom of 10ft vegetated shelf, Ay ,„e
9,751.fe
Area, sediment cleanout, top elevation (bottom of pond), 4g nea
19,455 h"
'Depth' (distance b/w bottom of 1011 shelf and top of sediment)
7.00 If
Average depth calculated
6.25 It OK
Average depth used in SAIDA, d„ (Round to nearest 0.511)
6.0 It OK
Drawdown Calculations
Drawdown thmmgh orifice?
Diameter of orifice (If circular)
Area of odiR: ('drron+9rcular)
Coefficient of discharge (Ce).
Driving head (lj
Drawdown through weal
Weir type
Coefficient of discharge (Cy)
Length of wet (L)
Driving head (H)
Pre -development 1-yr, 24-hr peak flow
Postdevelopmed 1-yr, 24Ju peak flow
Storage volume discharge rate (through discharge orifice or weir)
Storage volume drawdown firm
Additional Information
Vegetated side slopes.
Vegetated shelf slope
Vegetated shed width
Length of f owpath to width ratio
Length to width ratio
Trash rack for overflow & orifice?
Freeboard provided
Vegetated fitter provided?
Recorded drainage easement provided?
Captures all runoff at ultimate build -out?
Drain mechanism W mainlamance or emergerxies is:
Y (Y or N)
3.00 in
Inn
0.60. (unitless)
0.60 ft
N (Y or N)
(unidess)
(unitless)
ft
it
0.18 fe/sec
8.05 eisec
0.18 fetsec
4.64 days
3 :1
10 :1
10.0 It
3 :1
3.0 :1
y (Y or N)
1.7 It
OK, draws down in 2-5 days.
OK
OK
OK
OK
OK
OK
OK
N (Y or N) OK
Y (Y or N) OK
Y (Y or N) OK
Font SW401-VM Detention Baain-Rer.&w17/09 Perte I. a II. DesW Summery, Pegs 2 of 2

Permit No.
(to be provided by 0")
III. REQUIRED ITEMS CHECKLIST
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.
Paget Plan
In'� Sheet No.
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),
- Basin dimensions,
- Pretreatment system,
- High flow bypass system,
- Maintenance access,
- Proposed drainage easement and public right of way (ROW),
- Overflow device, and
- Boundaries of drainage easement.
2. Partial plan (1" = 30' or larger) and details for the wet detention basin showing:
Outlet structure with trash rack or similar,
- Maintenance access,
- Permanent pool dimensions,
- Forebay and main pond with hardened emergency spillway,
- Basin cross-section,
- Vegetation specification for planting shelf, and
- Filter strip.
3. Section view of the wet detention basin 0" = 20' or larger) showing:
- Side slopes, 3:1 or lower,
- Pretreatment and treatment areas, and
- Inlet and outlet structures.
s 4. If the basin is used for sediment and erosion control during construction, clean out of the basin is specified
on the plans pdor to use as a wet detention basin.
5. A table of elevations, areas, incremental volumes & accumulated volumes for overall pond and for forebay,
tovedfy volume provided.
6. A construction sequence that shows how the wet detention basin will be protected from sediment until the
entire drainage area is stabilized.
'mot 7. The supporting calculations.
Priti� 8. A copy of the signed and notarized operation and maintenance (0&M) agreement.
1%rtA"_ r-- 9. A copy of the deed restrictions (d required).
%vb,z't 10. A soils report that is based upon an actual field investigation, soil borings, and infiltration tests. County
soil maps are not an acceptable source of soils information.
Form SW401-Wet Detention Basin-Rev.8-9117t09 Part III. Required Items Checklist, Page 1 of 1