20061804 Ver 5_Stormwater Site Plans_20161116 (2)

Flowers Trilii'um
(Pod 9)
Phase Four
Owner/Developer:
Rebecca Flowers
4880 PJC 42 East
Clayton, PJC 27520
Phone: [phone]
STOCE
SEAL �
i 19343
G
fPg �% F
G, P.A.
801 E. Washington St. Phone: [phone]
PO Box 1108 Fax. [phone]
Nashville, NC 27856 Mobile: [phone]
Email; [e-mail]
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IL DESIGN INFORMATION
Permit (dumber:
Drainage area
(to be provided by DWQ)
�""
0%
%L
118,001 ft2
O`�O� WAryrRPG
NCDENR
Design rainfall depth
a
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.
E. PROJECT INFORMATION
Project name
Flowers Plantation - Pod 9 (Phase 4)
Contact name
Kevin Varnell
Phone number
252.459.8196
Date
October 21, 2676
Drainage area number
1
IL DESIGN INFORMATION
Site Characteristics
Drainage area
308,017 ft2
Imperious area
118,001 ft2
Percent imperious
38.3% %
Design rainfall depth
1.0 inch
Peak Flow Calculations
Is prelpost 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
PrelPost 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-situ soil:
Soil permeability
Planting media soil:
Soil permeability
Soil composition
% Sand (by volume)
% Fines (by volume)
% Organic (by volume)
Phosphorus Index (P -Index) of media
Form SW401-Bioretention-Rev.8
June 25, 2010
Y (Y or N)
3 in
0.12 inihr
0.686 ft/sec
0.541 ft/sec,
-0.145 ft'lsec
10,009.0 ft'
10,887.0 ft' OK
ft3
ft'
_ft'
0 ft'
—fta
12 inches OK
1.00 ft
12,590.0 ft2 OK
ft
ft
ft
6 hr OK
18 hr OK
24 hr
0.10 in/hr Insufficient. Increase infiltration rate or include underdrains.
2.00 in/hr OK
86% OK
10% OK
4% OK
Total: 100%
30 (unitless) OK
Parts I and II. Design Summary, Page 1 of 2

Basin Elevations
Temporary pool elevation
Type of bioretention cell (answer "Y" to only one of the two
following questions):
Is this a grassed cell?
Is this a cell with tfeeslshrubs?
Planting elevation (top of the mulch or grass sod layer)
Depth of mulch
Bottom of the planting media soil
Planting media depth
Depth of washed sand below planting media soil
Permit Number
(to be provided by DWQ)
258.00 fmsl
Y (Y or N) OK
N (Y or N)
258 fmsl
inches
256 tmsl
2 ft
0.33 ft
Are underdrains being installed? Y (Y or N)
How many clean out pipes are being installed?
What factor of safety is used for sizing the underdrains? (See
BMP Manual Section 12.3.6)
Additional distance between the bottom of the planting media and
the bottom of the cell to account for underdrains
Bottom of the cell required
SHWT elevation
Distance from bottom to SHWT
Internal Water Storage Zone (ILIUS)
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 filter?
Does the design use a level spreader to evenly distribute flow?
Is the BMP located at least 30 feet from surface waters (50 feet if
SA waters)?
Is the BMP located at least 100 feet from water supply wells?
Are the vegetated side slopes equal to or less than 3:1?
Is the BMP located in a proposed drainage easement with access
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
(flinches gravel followed by 3-5 ft of grass)
Grassed swale
Forebay
Other
20 OK
2 OK
I ft
254.67 fmsl
252 fmsl
2.67 ft OK
N (Y or N)
fmsl
258 ft
a
Y (Y or N) OK
N (Y or N) Excess volume must pass through filter.
It
N (Y or N) Show how flow is evenly distributed.
Y (Y or N) OK
Y (Y or N) OK
Y (Y or N) OK
Y (Y or N) OK
0.22 ft/sec OK
�ffim"]Kfa
N (Y or N) OK
Y (Y or N) OK
M
OK
Form SW401-Sioretention-Rev.8
June 25, 2010 Paris I and It. Design Summary, Page 2 of 2

Permit No:
(to be assigned by DWQ)
Ill. 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.
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.
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-oul,
Off-site drainage (if applicable),
Clean out pipe locations,
Overflow device, and
Boundaries of drainage easement.
Indicate the P -Index between 10 and 30
(N—C6 3. Section view of the bioretention cell (1" = 20' of 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 stone if applicable), #57 stone, underdrains (if applicable),
SHWT level(s), and overflow structure]
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AU CL -05
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37A C 4
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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
Fortilizer 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 SW461-Bioretention-Rev.7 Part III, Page 1 of 1

Watershed Model Schematic Hydraflow Hydrographs by Intelisolve v9.22
1 - Pre Development 2 - Bost Development
3 - Outflow
Project: Pre vs Post.gpw Friday, Oct 21, 2016

Hydrograph Return Peri®d Recap Hydraflow Hydrographs by Intelisolve v9.22
Hyd.
Hydrograph
Inflow
Peak Outflow (cfs)
Hydrograph
No.
type
Hyd(s)
description
(origin)
1 -Yr
2 -Yr
3 -Yr
5 -Yr
10 -Yr
25 -Yr
50 -Yr
100 -Yr
1
SCS Runoff
-------
0.686
-------
-------
-------
-------
-------
-------
-------
Pre Development
2
SCS Runoff
-------
12,09
-------
-------
-------
-------
-------
-------
-------
Post Development
3
Reservoir
2
0.541
-------
-------
----
-------
-------
-------
-------
Outflow
Proj. file: Pre vs Post.gpw
Friday, Oct 21, 2016

Hydrograph Summary Report Hydraflow Hydrographs by Intelisolve v9.22
Hyd.
No.
Hydrograph
type
(origin)
Peak
flow
(cis)
Time
interval
(min)
Time to
peak
(min)
Hyd.
volume
(cult)
Inflow
hyd(s)
Maximum
elevation
(ft)
Total
strge used
(cult)
Hydrograph
description
1
SCS Runoff
0.686
1
720
4,275
----
------
Pre Development
2
SCS Runoff
12.09
1
717
22,831
----
------
------
Post Development
3
t
3
I
Reservoir
f
0.541
I
i�
1
I
I
I
812
i
i
I
I
22,762
I
2
257.93
10,902
Outflow
Pre vs Post.gpw
Return Period: 1 Year
Friday, Oct 21, 2016

Hydrograph Report
Hydraflow Hydrographs by Intelisolve v9.22
Hyd. No. 1
Pre Development
Hydrograph type = SCS Runoff
Storm frequency = 1 yrs
Time interval
= 1 min
Drainage area
= 7.070 ac
Basin Slope
= 8.0%
Tc method
= KIRPICH
Total precip.
= 2.89 in
Storm duration
= 24 hrs
4
Friday, Oct 21, 2016
Peak discharge = 0.686 cfs
Time to peak =
720 min
Hyd. volume =
4,275 tuft
Curve number =
55
Hydraulic length =
800 ft
Time of cont. (Tc) =
3.55 min
Distribution =
Type II
Shape factor =
484
Pre Development
Q (cfs) Hyd. No. 1 -- 1 Year Q (cfs)
1.00
0.90
0.80
0.70
0.60
0.50
0.40
0.30
0.20
0.10
0 00
1.00
0.90
0.80
0.70
0.60
0.50
0.40
0.30
0.20
0.10
0.00
0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560
Time (min)
Hyd No. 1

Hydrograph Report
Hydraflow Hydrographs by Inteiisolve v9.22
Hyd. No. 2
Hyd. volume =
Post Development
Curve number =
Hydrograph type =
SCS Runoff
Storm frequency =
1 yrs
Time interval =
1 min
Drainage area =
7.070 ac
Basin Slope =
5.0%
Tc method =
KIRPICH
Total precip. =
2.89 in
Storm duration =
24 hrs
Q (Cs)
14.00
12.00
M
4.00
2.00
Post Development
Hyd. No. 2 -- 1 Year
5
Friday, Oct 21, 2016
Peak discharge = 12.09 cfs
Time to peak =
717 min
Hyd. volume =
22,831 cuft
Curve number =
75
Hydraulic length =
920 ft
Time of conc. (Tc) =
4.73 min
Distribution =
Type II
Shape factor =
484
Q (Cfs)
14.00
12.00
rf
. tI
2.00
0.00 v ' ' 0.00
0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560
Time (min)
Hyd No, 2

Hydrograph Report
Hydraflow Hydrographs by Intelisolve v9.22
Hyd. No. 3
Hyd. volume
Outflow
Max. Elevation
Hydrograph type
= Reservoir
Storm frequency
= 1 yrs
Time interval
= 1 min
Inflow hyd. No.
= 2 - Post Development
Reservoir name
= Bioretention
Storage Indication method used. Outflow includes exfiltration.
Outflow
C.1
Friday, Oct 21, 2016
Peak discharge = 0.541 cfs
Time to peak
= 812 min
Hyd. volume
= 22,762 cuft
Max. Elevation
= 257.93 ft
Max. Storage
= 10,902 tuft
Q (cfs) Hyd. No. 3 -- 1 Year Q (cfs)
14.00 14.00
12.00 12.00
10.00 10.00
8.00 8.00
6.00 6.00
4.00 4.00
2.00 2.00
0.00 0.00
0 240 480 720 960 1200 1440 1680 1920 2160 2400 2640 2880
Time (min)
Hyd No. 3 Hyd No. 2 EL�J Total storage used = 10,902 cuft

Pond Report
N
Hydraflow Hydrographs by Intelisolve v9.22 Friday, Oct 21, 2016
Pond No. 1 - Bioretention
Pond Data
Contours - User -defined contour areas. Average end area method used for volume calculation. Begining Elevation = 257.00 ft
Stage I Storage Table
Stage (ft)
Elevation (ft)
Contour area (sgft)
Incr. Storage (cult)
Total storage (cult)
0.00
257.00
10,887
0
0
1.00
258.00
12,590
11,739
11,739
2.00
259.00
14,350
13,470
25,209
2.50
259.50
15,250
7,400
32,609
Culvert t Orifice
Structures
Weir Structures
[A]
[B]
[C]
[PrfRsr]
[A] [B]
[C]
[D]
Rise (in)
= 42.00
0.00
0.00
0.00
Crest Len (ft)
= 20.00 0.00
0.00
0.00
Span (in)
= 42.00
0.00
0.00
0.00
Crest El. (ft)
= 258.00 0.00
0.00
0.00
No. Barrels
= 1
0
0
0
Weir Coeff.
= 3.33 3.33
3.33
3.33
Invert EI. (ft)
= 253.00
0.00
0.00
0.00
Weir Type
= Riser ---
---
---
Length (ft)
= 38.00
0.00
0.00
0.00
Multi -Stage
= Yes No
No
No
Slope (%)
= 15.63
0.00
0.00
n/a
N -Value
= .013
.013
.013
n/a
Orifice Coeff.
= 0.60
0.60
0.60
0.60
Exfil.(inlhr)
= 2,000 (by Contour)
Multi -Stage
= nfa
No
No
No
TW Elev. (ft)
= 0.00
Stage (ft)
3.00
2.00
1.00
0.00 1
0.00 10.00
Total Q
Note CulverUOrifice outflows are analyzed under inlet (ic) and oullet (cc) control. Weir risers checked for orifice conditions (ic) and submergence (s).
Stage I Discharge
20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00
Elev (ft)
260.00
259.00
M►141.1iI11
---L- 257.00
100.00
Discharge (cfs)

Permit Number:
(Io be provided by DWQ)
Drainage Area Number:
Bioretention 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 operation and maintenance procedures:
— Immediately after the bioretention cell is established, the plants willbe watered
twice weekly if needed until the plants become established (connnonly six
weeks).
--- Snow, mulch or any other material will NEVER be piled on the surface of the
bioretention cell.
-- Heavy equipment will NEVER be driven over the bioretention cell.
— Special care will betaken to prevent sediment from entering the bioretention cell.
-- Once a year, a soil test of the soil media will be conducted.
After the bioretention cell is established, I will inspect it once a month and within 24
hours after every storm event greater than 1.0 inches (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:
Potentialproblems:
How 1 will remediate theproblem:
The entire SMP
Trash/debris is present.
Remove the trash/ debris.
The perimeter of the
Areas of bare soil and/or
Regrade the soil if necessary to
bioretention cell
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.
The inlet device: pipe,
The pipe is clogged (if
Unclog the pipe. Dispose of the
stone verge or swale
applicable).
sediment off-site.
The pipe is cracked or
Replace the pipe.
otherwise damaged (if
applicable).
Erosion is occurring in the
Regrade the swale if necessary to
swale (if applicable).
smooth it over and provide erosion
control devices such as reinforced
turf matting or riprap to avoid
future problems with erosion.
Stone verge is clogged or
Reprove sediment and clogged
covered in sediment (if
stone and replace with clean stone.
applicable).
Forel SW401-Bioretention O&M-Rev.3 Page 1 of 4

SMI' element:
Potential roblems:
How I will remediate theproblem:
The pretreatment area
Flow is bypassing
Regrade if necessary to route all
pretreatment area and/or
flow to the pretreatment area.
hies have formed.
Restabilize the area after grading.
Sediment has accumulated to
Search for the source of the
a depth greater than three
sediment and remedy the problem if
inches.
possible. Remove the sediment and
restabilize the pretreatment area.
Erosion has occurred.
.Provide additional erosion
protection such as reinforced turf
matting or riprap if needed to
prevent future erosion problems.
Weeds are present.
Remove the weeds, preferably by
hand.
The bioretention cell:
Best professional practices
Prune according to best professional
vegetation
show that pruning is needed
practices.
to maintain optimal plant
health.
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 to establish the
ground cover if a soil test indicates
it is necessar .
`free stakes/wires are present
Remove tree stake/wires (which
six months after planting.
can kill the tree if not removed).
The bioretention cell:
Mulch is breaking down or
Spot mulch if there are only random
soils and mulch
has floated away.
void areas. Replace whole mulch
layer if necessary. Remove the
remaining much and replace with
triple shredded hard wood mulch at
a maximum depth of three inches.
Soils and/or mulch are
Determine the extent of the clogging
clogged with sediment.
- remove and replace either just the
top layers or the entire media as
needed. Dispose of the spoil in an
appropriate off-site location. Use
triple shredded hard wood mulch at
a maximum depth of three inches.
Search for the source of the
sediment and remedy the problem if
possible.
An annual soil test shows that
Dolomitic lime shall be applied as
pH has dropped or heavy
recommended per the soil test and
metals have accumulated in
toxic soils shall be removed,
the soil media.
disposed of properly and replaced
with new planting media.
Form SW401-Bioretention O&M-Rev.3 Page 2 of 4

BMP element:
Potentialproblems-
How I will remediate theproblem:
The underdrain system
Clog&g has occurred.
Wash out the underdrain system.
(if applicable)
The drop inlet
Clogging has occurred.
Clean out the drop inlet. Dispose of
the sediment off-site.
The drop inlet is damaged
Re air or replace the drop inlet.
The receiving water
Erosion or other signs of
Contact the NC Division of Water
damage have occurred at the
Quality 401 Oversight Unit at 919 -
outlet.
733-1786.
Form SW401-Bioretention O&M-Rev.3 Page 3 of 4

Permit Number:
(to beP•ovided byDWQ)
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 name1lowers Trillium (Pod 9) -Thaselour. _
BMP drainage area number:
Print name:Rebeeca Flowers
Title:Owner l Devela er
Address:4880 NG 42 East Qg on NC 27520
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, a Y�L.5 (9 L Lar0 , a Notary Public for the State of
CW k�, County of (1 j , do hereby certify that
personally appeared before me this
day of Tr , �� and acknowledge the due execution of the
forgoing bioretention maintenance requirements. Witness my hand and official seal,
Teresa O'Hara
Notary Public
Johnston Gountyb Z 1
My Commission expires
SEAL
My commission expires q 1 2� W_[
Form SW401-13ioretention &M -Rev. 2 Page 4 of 4

Soil & Environmental Consultants, PA
i 412 Fall, 4'I uu�e Road, Smite ilei, 164-igh, N`(: 2761 S' Phonic, (911ij 844-5' iml • F,m'9N) 846,94 i",
sande-c .eomi
October 24, 2016
Job t( 6058,55
DWI= c/o Stacks Engineering
Attn: Kevin Varncll
PC) Box l 108
Nashville, NC27856
Re: Detailed storm water soils evaluation for the proposed storm water BMP arca on
Trilliurri, 11017 9 Phase 4, Flowers Plantation, Jollnslon County, NC,
Dcar Mr. Vaniell:
Soil & Fnvironrnemal Consultants, PA (S&FC:') pert rrn ed a detailed soil evaluation within
the targeted area of the potential storni water basin ori the site mentioned above. The purpose
of this evaluation was to provide additional intorrnation tier the proper design of the proposed
13MP to treat the on-site. Morin water. Soil morphological profile descriptions were performed
at the specifcd location to determine depth to seasonal high water table (SWWT). The
following is a brief report oftlic methods utilized in Ibis evaluation and the results obtained.
Soil/Site Evaluation Methodology
The site evaluation was perfonncd by advancing a hand auger boring to seven feet in depth to
estimate seasonal high water table,. S&FC.' navigated to the soil boring locution within the:
storm water device location with a GIIS receiver to describe sail morphological conditions
using standard techniques outlined in the "Field Book fbi, Describing and Sampling Soils"
published by the Natural Resources Conservation Service (MRCS, 2002),
Soillsite Conditions
This site is located in the (-onstai Plain region ot'Johnsion County. Field investigation
revealed seasonal high coater table conditions at 46 inches from top of ground at the soil
boring location shown tarn the atlaclied neap. Under current regulations, the bottom of any
biorctention pond intist be a mininiurn of two feet above the seasonal high water table.
Current NC-DWR regulations also stipulate that an underdrain must be installed in a
bioretention area if soils underlying the structure have a drainage rate of less than 2 inl`lir.
S&F.C" made no attempt to measure soil saturated hydraulic conductivity (Ksat) in the
underlying soil at this titne but, due to the underlying clay loam horizons, S& FIC believes that
the hydraulic conductivity would be less than 2 tn,dir.

Soil Environmental Cmmltants,PA &||lam & m b0 (11'service 9 this mm ,L and we look
Agar to assisting in the successful c mp>wQno($ep project- ± req QaWt%S&L EC wlhmeel
on-site with NC.DW R to discuss our findings andrecm mew|! m Gn% Please Qd free to QH
will) ally questions 7 c mmQm S.
Sincerely,
Soil& Environmental Consultants,RW
ca SOILS , J/1
A ��+� O
luA*b
g»
�0 NORT"
Ricky 9c %Bo
NC censed Soil Scientist 41232
Page 2 o[2

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