20061804 Ver 12_More Info Received_20161214

J. Michael Stocks, PE
252.903.6891
J. Andrew Stocks, EI
252.450.5140
LETTER OF TRANSMITTAL zoac I s ori v l 2
Stocks Engineering, PA
PO Box 1108
Nashville, NC 27856
252.459.8196
To:
Corey Larsen
Job Name:
1617 Mail Service Center
12/12/16
Raleigh, NC 27699
Date:
12-12-16
Sent By:
Jeff Carter
Phone:
919-807-6379
Overnight No
Yes
We are sending you the following:
J.Kevin Varnell
252.382.0012
Jeff Carter
252.903.5036
Job No.
2016-014
Job Name:
Woodlands @ Flowers Plantation
12/12/16
Stormwater Management Permit Application
Date:
12-12-16
Sent By:
Jeff Carter
❑ EC Plans ❑ Prints/Plans ❑ Construction Plat ❑ Site Plan Drawings
❑ Contracts ❑ Permit Applications ❑ Site Work Calculations ❑
These are transmitted as checked below:
❑ For Approval ❑ As Discussed ❑ For Your File ❑ As Requested
❑ For Review and Comment ❑ For Your Signature, then return to:
❑ Computer Disk
❑ For Your Use
Copies
Date
Description
1
12/12/16
Stormwater Management Permit Application
o
Copies

Permit No.
(to be provided by Dv
®�� Op W A T�c9
OCOG
y
NCDENR a
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
H. DESIGN INFORMATION
Site Characteristics
Drainage area
Impervious area, post -development
% impervious
Design rainfall depth
Storage Volume: Non-SAWaters
Minimum volume required
Volume provided
Storage Volume: SA Waters
1.5" runoff volume
Pm -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 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-hrstorm
Pre -development 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 10t 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
NA
338,461 f2
130,244 fl
38.48 %
1.0 in
11,197 tt3
16,464 fl
OK, volume provided is equal to or in excess of volume required.
Its
fl'
fl
f
to
Y (Y or N)
2.9 in
0.35 (unidess)
0.58 (unitess)
0.12 in/hr OK
0.23 ft'/sec
0.23 R3/sec
0.00 fl /sec
140.80 fmsl
139.50 hsl
130.00 fmsl
140.00 fmsl
139.00 fmsl Data not needed for calculation option #1, but OK If provided.
137.00 fmsl
135.00 fmsl Data not needed for calculation option #1, but OK if provided.
2.00 It
Yes (Y or N)
140.8 fmsl OK
Form SW401-Wet Detention Basin-Rev.e-4/18/12 Parts I. & It. Design Summary, Page 1 of 2

Permit No.
(to be pmvlded by DWV
II. DESIGN INFORMATION
90%
Surface Areas
N (Y or N)
Area, temporary pool
14,179 11'
Area REQUIRED, permanent pool
8,462 ftz
SAIDA ratio2.50
(unitless)
Area PROVIDED, permanent pool, A�,e_pw
9,999 ft` OK
Area, bottom of 10ft vegetated shelf, Abp sw,
5,619 ft
Area, sediment cleanout, top elevation (bottom of pond), Abwaem
1,144 ft
Volumes
3.10 11 OK
Volume, temporary pool
18,852 fill Insufficient. Volume does not agree with data previously entered.
Volume, permanent pool, Vpem_y d
31,192 ft'
Volume, forebay (sum of forebays if more than one forebay)
6,143 ft'
Forebay % of permanent pool volume
19.7% % OK
SAIDA Table Data
Design TSS removal
90%
Coastal SAIDA Table Used?
N (Y or N)
MountairdPiedmont SAIDA Table Used?
Y (Y or N)
SAIDA ratio
2.50 (unhless)
Average depth (used in SAIDA table):
Vegetated shelf width
Calculation option 1 used? (See Figure 10-2b)
Y (Y or N)
Volume, permanent pool, Vp._P,
31,192 If
Area provided, permanent pool, Apep y
9,999 ft`
Average depth calculated
3.10 11 OK
Average depth used in SAIDA, da., (Round to nearest 0.50)
3.0 It OK
Calculation option 2 used? (See Figure 10-2b)
N (Y or N)
Area provided, permanent pool, A._,,
9,999 ft`
Area, bottom of 1Oft vegetated shelf, Ab ,if
5,619 ft`
Area, sediment cleanout, top elevation (bottom of pond), A,,,
1,144 fe
"Depth" (distance b/w bottom of ?Oft shelf and top of sediment)
2.00 It
Average depth calculated
ft
Average depth used in SAIDA, dn., (Round to down to nearest 0.511)
ft
Drawdown Calculations
Drawdown through once?
Y (Y or N)
Diameter of orifice (if circular)
2.00 in
Area of orifice (if-noncircular)
ins
Coefficient of discharge (CD)
0.60 (unitless)
Driving head (Ho)
0.33 it
Drawdown through welt?
N (Y or N)
Weir type
limitless)
Coefficient of discharge (C,,.)
(unittess)
Length of weir (L)
it
Driving head (H)
ft
Pre -development 1 -yr, 24 -hr peak flow
0.62 @'Ise;
Post -development 1 -yr, 24 -hr peak flow
0.59 ft'/sec
Storage volume discharge rate (through discharge orifice or weir)
0.06 ft'/sec
Storage volume drawdown fime
240 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 flowpath to width ratio
3 :1
OK
Length to width ratio
5.3 :1
OK
Trash rack for overflow 8 orifice?
Y (Y or N)
OK
Freeboard provided
1.0 ft
OK
Vegetated filter provided?
N (Y or N)
OK
Recorded drainage easement provided?
Y (Y or N)
OK
Capures all runoff at ultimate build -out?
Y (Y or N)
OK
Drain mechanism for maintenance or emergencies is:
Valve and Drawdown
Form SW401-Wet Detention Basin-Rev.94/18/12 Parts I. & II. Design Summary, Page 2 o1`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.
r C &AA 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.9-4/18/12 Part III. Required Items Checklist, Page 1 of 1
Page( Plan
Initials
Sheet No.
:3W
CA -4a
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 (ROH
- Overflow device, and
- Boundaries of drainage easement.
19hL
cwr,
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.
a_ -o*
3. Section view of the wet detention basin (1" = 20' or larger) showing:
- Side slopes, 3:1 or lower,
- Pretreatment and treatment areas, and
- Inlet and outlet structures.
'174.1
anCe
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.
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CE -C&
5. A table of elevations, areas, incremental volumes & accumulated volumes for overall pond and for Forebay,
to verify volume provided.
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6. A construction sequence that shows how the wet detention basin will be protected from sediment until the
entire drainage area is stabilized.
A=$-0
7. The supporting calculations.
_
(J1LGS
8. A copy of the signed and notarized operation and maintenance (0&M) agreement.
9. A copy of the deed restrictions (if required).
r C &AA 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.9-4/18/12 Part III. Required Items Checklist, Page 1 of 1

Permit Number.
(to be provided by DWQ)
I0� 111AATF.q
N g�V `�
NCDENR
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 Ill) must be printed, filled out and submitted along with all of the required information.
Project name
Woodlands @ Flowers Plantation (NE -6)
Contact name
Kevin Vamell
Phone number
252.459.8196
Date
June 27, 2016
Drainage area number
1
II. DESIGN INFORMATION
Site Characteristics
Drainage area
76,666 ft'
Impervious area
51,836 ft2
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?
1 -yr, 24 -hr runoff depth
1 -yr, 24 -hr intensity
Pre -development 1 -yr, 24 -hr peak flow
Post -development 1 -yr, 24 -hr peak flow
Pre/Post 1 -yr, 24 -hr peak control
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
Cell Dimensions
Ponding depth of water
Ponding depth of water
Surface area of the top of the bioretention cell
Length:
Width:
-or- Radius
Media and Soils Summary
Drawdown time, ponded volume
Drawdown time, to 24 inches below surface
Drawdown time, total:
In-sftu soil.•
Soil permeability
Planting media soil:
Soil permeability
Soil composition
% Sand (by volume)
% Fines (by volume)
% Organic (by volume)
Y (Y or N)
2.89 in
0.12 in/hr
0.189 ft'/sec
0.134 ft'/sec
-0.055 ft3/sec
4,217.0 ft'
4,876.0 ft'
ft3
ft3
ft3
0 ft,
W
OK
12 inches OK
1.00 ft
5,351.0 ftZ OK
ft
ft
It
6 hr OK
18 hr OK
24 hr
0.10 in/hr Insufficient. Increase infiltration rate or include underdrains.
3.50 in/hr OK
86%
OK
10%
OK
4%
OK
Total: 100%
Phosphorus Index (P -Index) of media 30 (unitless) OK
Form SW401-eioretention-Revd
June 25, 2010
Parts I and II. Design Summary, Page 1 of 2

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

Permit No:
(to be assigned by DWQ)
111. 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
Initials Sheet No.
03WL C& -0A 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),
- 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.
CC -09 2. Plan details (1' = 30' or larger) for the bioretention cell showing
- 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
(IVII U -CIS 3. Section view of the bioretention cell (1' = 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, filter fabric (or choking stoned applicable), #57 stone, underdrains (if applicable),
SHWT level(s), and overflow structure]
jC�
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 0" = 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.
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a1
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.
A9.
A copy of the deed restriction.
Form SW401-81oretention-Rev.7
Part III, Page 1 of 1

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