20061804 Ver 12_More Info Received - Email_20161216

Permit No.
fro be provided byDWq
II. DESIGN INFORMATION
01t YYA
�
9
♦
NCDENR
Drainage area
.�(
o
Impervious area, post -development
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
%impervious
38.48 %
401 CERTIFICATION APPLICATION FORM
1.0 in
WET DETENTION BASIN SUPPLEMENT
This form must be filled out, printed and submitted.
The Required Items Checklist (Part 111) must be printed, filled out and submitted along with all of the required information,
I. PROJECT INFORMATION
Project name
Woodlands W Flowers Plantation (Pod NE -6)
Contact person
Kevin Vamell
Phone number
252.459.8196
Date
27 -Jun -16
Drainage area number
NA
II. DESIGN INFORMATION
Site Characteristics
Drainage area
338,461 rye
Impervious area, post -development
130,244 ft2
%impervious
38.48 %
Design rainfall depth
1.0 in
Storage Volume: Non-SAWaters
Minimum volume required
Volume provided
Storage Volume: SA Waters
1.5' runoff volume
Pre -development 1 -yr, 24 -hr runoff
Post -development) -yr, 24 -hr mnog
Minimum volume required
Volume provided
Peak Flow Calculations
Is the pre/post control of the lyr 24hr storm peak flow required?
1 -yr, 24 -hr rainfall depth
Rational C, pre -development
Rational C, post -development
Rainfall intensity: 1 -yr, 24 -hr storm
Pre -development 1 -yr, 24 -hr peak flow
Post -development 1 -yr, 24 -hr peak flow
PrelPost 1 -yr, 24 -hr peak flow control
Elevations
Temporary pool elevation
Permanent pool elevation
SHWT elevation (approx. at the perm. pool elevation)
Top of 108 vegetated shelf elevation
Bottom of 10ft vegetated shelf elevation
Sediment cleanout, top elevation (bottom of pond)
Sediment cleanout, bottom elevation
Sediment storage provided
Is there additional volume stored above the state -required temp. pool?
Elevation of the top of the additional volume
11,197 83
16,4640 OK, volume provided is equal to or In excess of volume required.
ft'
to
83
to
fe
Y (Y or N)
2.9 in
0.35 (unitless)
0.58 (unitless)
0.12 in#1r OK
0.23 ft'/sec
0.23 f0/sec
0.00 f/sec
240.80 fmsl
239.50 fmsl
230.00 fmsl
240.00 fmsl
239.00 fmsl Data not needed for calculation option #1, but OK if provided.
237.00 fmsl
235.00 fmsl Data not needed for calculation option #1, but OK if provided.
2.00 It
Yes (Y or N)
240.8 fmsl OK
Foran SW401-Wet Detention Basin-Rev.9-4118112 Parts I. & II. Design Summary, Page t of 2

Permit No.
(to be provided by DWQ)
II. DESIGN INFORMATION
Surface Areas
Area, temporary pool
14,179 f?
Area REQUIRED, permanent pool
8,462 fte
SAIDA ratio
2.50 (unilless)
Area PROVIDED, permanent pool, Ace,,,,
9,999 ft`
OK
Area, bottom of 1011 vegetated shelf, Aya sns1
5,619 ft`
Area, sediment cleanout, lop elevation (bottom of pond), Am d
1,144 11`
Volumes
Volume, temporary pool
18,852 ft'
Insufficient. Volume does not agree with data previously entered.
Volume, permanent pool, V._p,
31,192 if
Volume, forebay (sum of forebays if more than one forebay)
6,143 rya
Forebay % of permanent pool volume
19.7% %
OK
SAIDA Table Data
Design TSS removal
90 %
Coastal SAIDA Table Used?
N (Y or N)
Mountain/Piedmont SAIDA Table Used?
Y (Y or N)
SAIDA ratio
2.50 (unilless)
Average depth (used in SAIDA table):
Calculation option 1 used? (See Figure 10-2b)
Y (Y or N)
Volume, permanent pool, V. -PW
31,192 ft'
Area provided, permanent pool, A ea m
9,999 ft
Average depth calculated
3.10 11
OK
Average depth used in SAIDA, d.„ (Round to nearest 0.511)
3.0 ft
OK
Calculation option 2 used? (See Figure 10-2b)
N (Y or N)
Area provided, permanent pool, Ace,,,,
9,999 ft,
Area, bottom of 1 Oft vegetated shelf, A,, y,�g
5,619 ft
Area, sediment cleanout, lop elevation (bottom of pond), A
1,144 fte
'Depth' (distance b/w bottom of 1Oft shelf and top of sediment)
2.00 it
Average depth calculated
ft
Average depth used in SAIDA, d,,,, (Round to down to nearest 0.5ft)
ft
Drawdown Calculations
Drawdown through orifice?
Y (Y or N)
Diameter of orifice (if circular)
2.00 in
Area of orifice (if -non -circular)
in'
Coefficient of discharge (Cu)
0.60 (unilless)
Driving head (Ha)
0.33 It
Drawdown through weir?
N (Y or N)
Weirtype
(unilless)
Coefficient of discharge (C„.)
(unilless)
Length of weir (L)
it
Driving head (H)
ft
Pre -development 1 -yr, 24 -hr peak flow
0.62 fP/sec
Post -development 1 -yr, 24 -hr peak flow
0.59 fP/sec
Storage volume discharge rate (through discharge orifice or weir)
0.06 fts/sec
Storage volume drawdown time
2.40 days
OK, draws down in 2-5 days.
Additional Information
Vegetated side slopes
3 :1
OK
Vegetated shelf slope
10 :1
OK
Vegetated shelf width
10.0 it
OK
Length of fiowpalh to width ratio
3 :1
OK
Length to width ratio
5.3 :1
OK
Trash rack for overflow & orifice?
Y (Y or N)
OK
Freeboard provided
1.0 it
OK
Vegetated filter provided?
N (Y or N)
OK
Recorded drainage easement provided?
Y (Y or N)
OK
Captures all runoff at ultimate build -out?
Y (Y or N)
OK
Drain mechanism for maintenance or emergencies is:
Valve and Drawdown
Forth SW401-Wet Detention Basin-Rev.9-4/18112 Parts I. & II. Design Summary, Page 2 of 2

Permit No.
(to be provided by DWQ)
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.
Pagel Plan
- Side slopes, 3:1 or lower,
Initials Sheet No.
- Pretreatment and treatment areas, and
!3W - Cie -c%
1. Plans (1" - 50' or larger) of the entire site showing:
'17ZI fgnCe_
- 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 (ROVE,
�+✓ FI H
- Overnow device, and
- Boundaries of drainage easement.
'VAV GE -4S
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.
'VV (4-09 3. Section view of the wet detention basin (1" = 20' or larger) showing
�w LLS 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-Wel Detention Basin-Rev.9-4/18/12 Part III. Required Items Checklist, Page 1 of 1
- Side slopes, 3:1 or lower,
- Pretreatment and treatment areas, and
- Inlet and outlet structures.
'17ZI fgnCe_
4. If the basin is used for sediment and erosion control during construction, clean out of the basin is specified
on the plans prior to use as a wet detention basin.
5. A table of elevations, areas, incremental volumes & accumulated volumes for overall pond and for Forebay,
to verify 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.
7. The supporting calculations.
8. A copy of the signed and notarized operation and maintenance (O&M) agreement.
�+✓ FI H
9. A copy of the deed restrictions (if required).
�w LLS 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-Wel Detention Basin-Rev.9-4/18/12 Part III. Required Items Checklist, Page 1 of 1

*A
NCDENR
Permit Number:
(to be provided by DW4)
o2ot WATFgO
y
O <
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
BIORETENTION CELL SUPPLEMENT
This form must be filled out, printed and submitted.
The Required items Checklist (Part 111) must be printed, filled out and submitted along with all of the required information.
I. PROJECT INFORMATION
Project name Woodlands @ Flowers Plantation (NE -6)
Contact name Kevin Varnell
Phone number 252.459.8196
Date June 27, 2016
Drainage area number 1
Site Characteristics
Drainage area
76,666 i(2
Impervious area
51,836 fl2
Percent impervious
67.6% %
Design rainfall depth
1.0 inch
Peak Flow Calculations
Is pre/post control of the 1 -yr, 24 -hr peak flow required?
Y (Y or N)
1 -yr, 24 -hr runoff depth
2.89 in
1 -yr, 24 -hr intensity
0.12 in/hr
Pre -development 1 -yr, 24 -hr peak flow
0.189 fl'/sec
Post -development 1 -yr, 24 -hr peak flow
0.134 ft' /sec
Pre/Post 1 -yr, 24 -hr peak control
-0.055 ft'/sec
Storage Volume: Non-SAWaters
Minimum volume required
4,217.0 ft'
Volume provided
4,876.0 ft'
OK
Storage Volume: SA Waters
1.5" runoff volume
it,
Pre -development l-yr,24-hrrunoff
it,
Post -development 1 -yr, 24 -hr runoff
fl'
Minimum volume required
0 it,
Volume provided
to
Cell Dimensions
Ponding depth of water
12 inches
OK
Ponding depth of water
1.00 it
Surface area of the top of the bioretention cell
5,351.0 ft2
OK
Length:
ft
Width:
ft
-or- Radius
it
Media and Soils Summary
Drawdown time, ponded volume
6 hr
OK
Drawdown time, to 24 inches below surface
18 hr
OK
Drawdown time, total:
24 hr
In-situ soil.,
Soil permeability
0.10 in/hr
Insufficient. Increase infiltration rate or include underdrains.
Planting media soil:
Soil permeability
3.50 inthr
OK
Soil composition
% Sand (by volume)
86%
OK
% Fines (by volume)
10%
OK
% Organic (by volume)
4%
OK
Total: 100%
Phosphorus Index (P -Index) of media
30 (unitless)
OK
Form SW401-eioretention-Rev.e
June 25, 2010
Parts I and 11. Design Summary, Page 1 of 2

Permit
Basin Elevations
(to be provided by DWQ)
Temporary pool elevation
229.00 fmsl
Type of bioretention cell (answer "Y" to only one of the two
Does volume in excess of the design volume bypass the
Y
following questions):
OK
bioretention cell?
Is this a grassed cell?
Y (Y or N)
OK
Is this a cell with trees/shrubs?
N (Y or N)
(Y or N)
Planting elevation (top of the mulch or grass sod layer)
228 fmsl
Depth of mulch
inches
What is the length of the vegetated filter?
Bottom of the planting media soil
226 fmsl
Planting media depth
2 ft
(Y or N)
Depth of washed sand below planting media soil
0.33 ft
Y
Are underdrains being installed?
Y (Y or N)
SA waters)?
How many clean out pipes are being installed?
4
Insufficient number of clean out pipes provided.
What factor of safety is used for sizing the underdrains? (See
p
OK
BMP Manual Section 12.3.6)
Are the vegetated side slopes equal to or less than 3:1?
Y
Additional distance between the bottom of the planting media and
1 it
Is the BMP located in a proposed drainage easement with access
the bottom of the cell to account for underdrains
(Y or N)
OK
Bottom of the cell required
224.67 fmsl
SHWT elevation
220 fmsl
Distance from bottom to SHWT
4.67 ft
OK
Internal Water Storage Zone (IWS)
Does the design Include IWS N (Y or N)
Elevation of the top of the upturned elbow fmsl
Separation of IWS and Surface 228 ft
Planting Plan
Number of tree species 0
Number of shrub species
Number of herbaceous groundcover species
Additional Information
Does volume in excess of the design volume bypass the
Y
(Y or N)
OK
bioretention cell?
Does volume in excess of the design volume flow evenly distributed
N
(Y or N)
Excess volume must pass through filter.
through a vegetated filter?
What is the length of the vegetated filter?
It
Does the design use a level spreader to evenly distribute flow?
N
(Y or N)
Show how flow is evenly distributed.
Is the BMP located at least 30 feet from surface waters (50 feet if
Y
(Y or N)
OK
SA waters)?
Is the BMP located at least 100 feel from water supply wells?
Y
(Y or N)
OK
Are the vegetated side slopes equal to or less than 3:1?
Y
(Y or N)
OK
Is the BMP located in a proposed drainage easement with access
Y
(Y or N)
OK
to a public Right of Way (ROM?
Inlet velocity (from treatment system)
0.52 fUsec
OK
Is the area surrounding the cell likely to undergo development in
N
(Y or N)
OK
the future?
Are the slopes draining to the bioretention cell greater than 20%? N (Y or N) OK
Is the drainage area permanently stabilized? Y (Y or N) OK
Pretreatment Used
(Indicate Type Used with an "X" in the shaded cell)
Gravel and grass
(8 orches gravel followed by 3-5 ft of grass)
Grassed swale OK
Forebay X
Other
Form SW401-8ioretention-Rev.8
June 25, 2010 Parts I and II. Design Summary, Page 2 of 2

Permit No:
Ito be assigned by DWQ)
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.
Page/ Plan
Initials Sheet No.
L �_
1. Plans 0" - 50' or larger) of the entire site showing:
_Wf
- Design at ultimate build -out,
- Off-site drainage (if applicable),
- Delineated drainage basins (include Rational C coefficient per basin),
- Cell dimensions,
- Pretreatment system,
- High flow bypass system,
- Maintenance access,
- Recorded drainage easement and public right of way (ROW),
-Clean out pipe locations,
- Overflow device, and
- Boundaries of drainage easement.
!Y�V CC —09 2. Plan details (1" = 30' or larger) for the bioretention cell showing
(x✓ C4"o$
-7ky Lmo
t"lt Z
R_
- Cell dimensions
- Pretreatment system,
- High flow bypass system,
- Maintenance access,
- Recorded drainage easement and public right of way (ROW),
- Design at ultimate build -out,
- Off-site drainage (if applicable),
- Clean out pipe locations,
- Overflow device, and
- Boundaries of drainage easement.
- Indicate the P -Index between 10 and 30
3. Section view of the bioretention cell 0" = 20' or larger) showing:
- Side slopes, 3:1 or lower
- Underdrain system (if applicable), and
- Bioretention cell layers [ground level and slope, pre-treatment, ponding depth, mulch depth, fill media
depth, washed sand, filler fabric (or choking stone if applicable), #57 stone, underdrains (if applicable),
SHWT level(s), and overflow structure]
4. A soils report that is based upon an actual field investigation, soil borings, and infiltration tests. The
results of the soils report must be verified in the field by DWQ, by completing & submitting the soils
investigation request form. County soil maps are not an acceptable source of soils information. All
elevations shall be in feet mean sea level (fmsl). Results of soils tests of both the planting soil and the in
situ soil must include:
- Soil permeability,
- Soil composition (% sand, % fines, % organic), and
P -index.
5. A detailed planting plan (1" = 20' or larger) prepared by a qualified individual showing:
- A variety of suitable species,
- Sizes, spacing and locations of plantings,
-Total quantity of each type of plant specified,
A planting detail,
- The source nursery for the plants, and
- Fertilizer and watering requirements to establish vegetation.
6. A construction sequence that shows how the bioretention cell will be protected from sediment until the
entire drainage area is stabilized.
7. The supporting calculations (including underdrain calculations, if applicable).
8. A copy of the signed and notarized inspection and maintenance (I&M) agreement.
9. A copy of the deed restriction.
Form SW401-Bioretention-Rev.7 Pad III, Page 1 of 1

N
D-
c
0
n
E
W 0
T N
o
O C
Z W
LU
L
uS
p
V
QU i L -ET
.3Co''' SGP
�'_'-.�.-� ' Q.
i�IPcS ouZ- 4� 3ta
Nw, lECa
USS 1C-L)e S.D
KYJol-,U
2.4. fl
e�
f
MIN. IP -EQ .
MI
/o
S
(o'
i (}SE Crams $ P-tD ovz� MI?�pl1'.�,�,/S" IN aEr I i ,
N

--wolt-cs-----Z!-4-
7&r4",
- L -4—
7&r4 , - SL,uZ-S.F - -
/MQaPkicauS ��?S
.'St—c-r = _4fr (off %r

_yr, CftLwl,a'is� �FH�E Mr�.��.�wt Pfwtnv,-S-T�� -
/M� utauS t,.►/ -nhE_ 12-)CLS77 JCP- Vo(-.0VUA-C --- -
8-7(e c -r ?Qf ZuLDrcZ)
B� DMJ4" I_
y� Z!7 CF Voww�E ZFAu (ZEA
e
V= 3, (a -?o -+E ! .6 -w- 0.45- -*- A , wltia� V = (059c.F
4059 C.F - A
C. 3o -r.- ( 4� o.gs�)
o. !q_l •4c = A
4_sem ��-(M� utia5s-&�r��ss
C�1-�E �crr-��=t�Ecs -BMR

-
C I. ZZ A -t.----
-- —�� 0.05 —r o.q ��A �__c,,,��..•��'.��-�
0.057-t_OM
4t 7 C�