20061804 Ver 5_Stormwater Info_20130201

Soil & Environmental Consultants, PA
11010 Raven Ridge Road • Raleigh, North Carolina 27614 • Phone. [phone] • Fax: [phone]
www.SandEC.com
February 1, 2013
tq, -18o�v3 S &EC Project # 6658.P6
To: N.C. Division of Water Quality
WEBSCAPE Unit
Attn: Karen Higgins /Annette Lucas
512 N. Salisbury Street -9th floor
Raleigh, NC 27603
Re: The Village at Flowers Plantation
Stormwater Management Plan -POD NW-8 (Phase 1)
DWQ Project #20061804, Ver.3 /Certification No. 3766
Johnston County, NC
On behalf of Mrs. Rebecca Flowers, please find the attached Stormwater Management Plan for
POD NW -8 (Phase 1). According to the Individual 401 Water Quality Certification Approval
Certification No. 3766, Condition No. 9, °a final, written stormwater management plan for each
phase of this project shall be submitted to the DWQ 401 Oversight/Express Permitting Unit for
review and approval'. Therefore, please see attached Stormwater Management Plan for your
review and anticipated Approval. Please contact me at DEdwardsa- SandEC.com or (919) 846-
5900 if you have any questions..
Sincerely,
Soil & Environmental Consultants, PA
Deborah Edwards
Environmental Specialist
Attachments:
1) Flowers Plantation Pod NW 8 Sitework Calculations
2) Overall POD map (east side of Buffalo Rd.)
3) Flowers Plantation NW-8 PH1 -26 Lots - Flowers Crest Cover Sheet
4) POD NW -8 PH1 Overall Site Plan -C -1 & C -2
5) POD NW -8 PH1 Erosion & Sediment Control Plan
6) POD NW -8 PH1 Bioretention Details

Flowers Plantation
Pod NW 8
Owner /Developer:
Rebecca Flowers
4880 NC 42 East
Clayton, NC 27520
Phone: [phone]
MiLAM
STOCKS ENGINEERING P.A.
1100 Eastern avenue Phone: [phone]
PO Box 1108 Fax: [phone]
Nashville, NC 27856 Mobile: [phone]
Email: [e-mail]

I YR: 0.92 cfs
IThe current property is forested. The post condition will utilize a Bioretention
cell for both nutrient reduction and peak flow reduction.
The proposed site will utilize a Bioretention cell to offset the nutrient requiremen,
The nutrients remaining nutrients will be bought down in the amount of $1,899.1

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Po p ^%,J 8
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Watershed Model Schematic
1 - pm- Development
Project: Pre vs Post Calcs.gpw
Hydraflow Hydmgraphs by Intellsolve v9.22
2 - Post Development
3 - Outflow io
Wednesday, Jan 8, 2013

Hvdrograph Return Period Recap WdMftw"mgmphsbylntelisalvev9.22

Hydrograph Summary Report
3
Horattow Hydrographs by Intelisolve v9.22
Hyd.
Hydrograph
Peak
Time
Time to
Hyd.
inflow
Maximum
Total
Hydrograph
No.
type
flow
interval
peak
volume
hyd(s)
elevation
strge used
description
(origin)
(cfs)
(min)
(min)
(cuff)
(tt)
(Cuff)
1
SCS Runoff
0.820
2
720
5,018
—
- --
----
Pre - Development
2
SCS Runoff
11.66
2
718
23,459
—
----
--
Post Development
3
Reservoir
0.220
2
1110
6,825
2
290.95
18,035
Outflow
Pre vs Post Calcs.gpw Return Period: 1 Year Wednesday, Jan 9, 2013

4
Hydrograph Report
Hydraflow Hydrographs by Intelisohre v9.22
Wednesday, Jan 9. 2013
Hyd. No. 1
Pre - Development
Hydrograph type
= SCS Runoff
Peak discharge =
0.920 cfs
Storm frequency
= 1 yrs
Time to peak =
Hyd. volume =
12.00 hrs
5,018 cuft
Time interval
Drainage area
= 2 min
= 7.590 ac
Curve number =
55
Basin Slope
= 10.0%
Hydraulic length =
1000 ft
Tc method
= KIRPICH
Time of conc. (Tc) =
3.86 min
Total precip.
= 3.00 in
Distribution =
Type II
Storm duration
= 24 hrs
Shape factor =
484
Q (C%)
1.00
0.90
0.80
0.70
0.60
0.50
0.40
0.30
0.20
0.10
0.00 '
0 2 4
Hyd No. 1
6 8
Pre - Development
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
l I I I 0.00
10 12 14 16 18 20 22 24 26
Time (hrs)

5
Hydrograph Report
Hydreflow Hydro9raptks by Intelisolve v9.22
Wednesday, Jan 9, 2013
Hyd. No. 2
Post Development
Hydrograph type =
SCS Runoff
Peak discharge =
11.66 cfs
Storm frequency =
1 yrs
Time to peak =
11.97 hrs
Time interval =
2 min
Hyd. volume =
23,459 cuft
Drainage area =
7.590 ac
Curve number =
74
Basin Slope =
10.0%
Hydraulic length =
1000 ft
Tc method =
KIRPICH
Time of conc. (Tc) =
3.86 min
Total precip. =
3.00 in
Distribution =
Type II
Storm duration =
24 hrs
Shape factor =
484
Q (cfs)
12.00
10.00
8.00
wa
4.00
1X
II
'
0 2 4
Hyd No. 2
6 8
Post Development
Hyd. No. 2 —1 Year
Q (cfs)
12.00
Kral-1161
8.00
6.00
4.00
2.00
' " ' ' ' 0.00
10 12 14 16 18 20 22 24 26
Time (hrs)

6
Hydrograph Report
Hydraflow Hydrographs by IntelisoNe v9.22
Wednesday, Jan 9, 2013
Hyd. No. 3
Outflow
Hydrograph type
= Reservoir
Peak discharge
= 0.220 cfs
Storm frequency
= 1 yrs
Time to peak
= 18.50 hrs
Time interval
= 2 min
Hyd. volume
= 6,825 cuft
Inflow hyd. No.
= 2 - Post Development
Max. Elevation
= 290.95 ft
Reservoir name
= Bioretention
Max. Storage
= 18,035 cuft
Storage Indication method used.
Outflow
Q (�) Hyd. No. 3 —1 Year Q ()
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 4 8 12 16 20 24 28 32
Time (hrs)
-- Hyd No. 3 — Hyd No. 2 9= Total storage used = 18,035 cult

Pond Report '
Hydraftow Hydrographs by Intelisolve v9.22
Wednesday, Jan 9, 2013
Pond No. 1 - Bloretention
Pond Data
Contours - User - defined contour areas. Average end area method used for volume calculation. Begining Elevation = 290.00 ft
Stage I Storage Table
Stage (R) Elevation (ft) Contour area (sgtt)
Incr. Storage (cuf)
Total storage (tuft)
0.00 290.00
16,759
0
0
1.75 291.75
21,249
33.257
33,257
Culvert I Orifice Structures
Weir Structures
[A] [B]
[C]
[PrfR$rI
[A] [B]
[C]
[D]
Rise (in) = 24.00 0.00
0.00
0.00
Crest Len (R)
= 14.00 0.00
0.00
0.00
Span (in) - 24.00 0.00
0.00
0.00
Crest Fa. (R)
- 291.00 0.00
0.00
0.00
No. Barrels = 1 0
0
0
Weir Coeff.
= 3.33 3.33
3.33
3.33
Invert 8. (ft) = 287.00 0.00
0.00
0.00
Weir Type
= Riser --
-
-
Length (ft) = 54.00 0.00
0.00
0.00
Multi -Stage
= Yes No
No
No
Slope M = 15.00 0.00
0.00
n/a
N -Value = .013 .013
.013
n/a
Orifice Coeff. = 0.60 0.60
0.60
0.60
ExflQin/hr)
= 0.000 (by Contour)
Multi -Stage = n/a No
No
No
TW Elev. (R)
- 0.00
Stage (ft)
2.00
1.80
1.60
1.40
1.20
1.00
0.80
0.60
0.40
020-
000
NoW CNverM floe mdliawe are arm"W under WM (ic) and adlet (oc) comroi Weir risers ducked rar aifwe CMWAbre (k) end sLrrurgerw (e)
Stage I Discharge
Elev (ft)
292.00
291.80
291.60
29140
291.20
291.00
290.80
290.60
290.40
290.20
290.00
0.00 3.00 6.00 9.00 12.00 15.00 18.00 21.00 24.00 27.00 30.00
Total Q Discharge (cis)

Neuse River Basin:
Total Nitrogen Loading Calculation Worksheet
Project Name: Rowers Plantadon - Pod NW 8
Date: 11312013
By: X Varnell Chocked BY:
::i `# 0 I ry 1 .0 4'
7
3.35
2.60
14."
0.7
3.35
1.95
4."
4.6
3.35
1.42
21.74
0.0
3.35
0.46
2.60
0.00
0.46
1.95
0.00
0.46
1.42
1.72
0.46
4.23
0.00
0.46
2.04
0.00
0.46
0.94
0.22
0
1.94
i:14
xN:
3.14
0.62
::i `# 0 I ry 1 .0 4'
7
3.35
2.60
14."
0.7
3.35
1.95
4."
4.6
3.35
1.42
21.74
0.0
3.35
0.95
0.00
0.35 41.39
MMMmmMHW§7-1_U
pals are 3.6
Bioretention without IWS = 35% TN reduction
Total TN After BMP = 3.84 lbelactyr

NUTRIENT OFFSET MITIGATION PAYMENT SUMMARY
Jurisdiction:
Rocky Mount
Basin:
Tar/Pamlico
Project Name:
Nash County EMS
Address:
Parkland Avenue and Executive Drive
Engineer of Record:
Stocks Engineering
Date:
11/4110
Site Characteristics
Acreage 7.01 acres
Redevelopment Site: No (Yes or No)
BMP(s) Utilized: Bioretention
Preaevelopment Wrogen Loading
Nitrogen
Ibtyear
0.43
lb /acre/year
Post-Development Nitrogen Loading
Nitrogen
41.39
Ibtyear
5.90
lb/acre/year
Nitrogen Umits
Nitrogen
25.236
Ibtyear
3.60
lb/acre/year
Post -BMP Nitrogen and Phosphorous Loading
Nitrogen
26.92
lb/year 1
3.84
Ib/acre/year
Nutrient Bu -Down Summary
Nitrogen =
1.66
lb/year
0.24
lb/acre/year
NCEEP Offset Payment Schedule
Nitrogen =
$20.29 per lb.
Buydown Calculations
Nitronen
= [($ fib) (# of Ibtyr) (30 yrs)
Total Nitrogen Buydown $
1,899.14
Total Nutrient Offset Mitigation Payment
=
$1,898.14

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Q V =
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0. (NCO
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Permit Number.
(to be wv~by DWry
MA V
=EW b <
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 lnformafion.
Project name
Contact name
Phone number
Date
Drainage area number
252.4591196
January 3, 2013
1
- Pod NW 8
II. DESIGN INFORMATION
Y (Y or N)
Site Characteristics
3 in
Drainage area
330,60 it2
Impervious area
115,717 to
Percent impervious
35.0% %
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
3 in
1 -yr, 24-hr Intensity
0.12 Whr
Pre-development 1 -yr, 24-hr peak flow
0.920 ft' /sec
Post -development 1 -yr, 24-hr peak flow
0.220 0 /sec
Pre/Post 1 -yr, 24-hr peak control
-0.700 felsec
Storage Volume: Non-SA Waters
ft'
Minimum volume required
16,531.0 fe
Volume provided
16,759.0 ft OK
Storage Volume: SA Waters
1.5' runoff volume
ft'
Pre-development 1 -yr, 24-hr runoff
ft'
Post- development 1 -yr, 24-hr runoff
ft'
Hnimum volume required
0 ft
Volume provided
ft'
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
16,759.0 ft OK
Length:
ft
Width:
ft
-or- Radius
ft
Media and Soils Summary
Drawdown time, ponded volume
6 hr
OK
Drawdown lime, to 24 inches below surface
18 hr
OK
Drawdown time, total:
24 hr
ln4b soih.
Soll permeability
0.10 inlhr
Insufficient. Increase infiltration rate or include underdrains.
RlanUng media sofk
Soil permeability
2.00 inlhr
OK
Sol composition
% Sand (by volume)
86%
OK
% Ftrtes (by volume)
10%
OK
% Organic (by volume)
4%
OK
Total: 100%
Phosphorus Index (P- Index) of media
30 (unitiess)
OK
Form SW4014moretenvon -Rev.8
June 25.2010
Parts 1 and II. Design Summary, Page 1 of 2

Permit Numbe
(to be provtded by D*q
Basin Bevations
Temporary pool elevation
291.00 fmsi
Type of bioretention cell (answer'Y' to only one of the two
following questions):
Is this a grassed cell?
Y
(Y or N)
OK
Is this a cell with tressishrubs?
N
(Y or N)
Planting elevation (top of the mulch or grass sod layer)
290 fmsl
Depth of mulch
inches
Bottom of the planting media soil
288 fmsl
Planting media depth
2 ft
Depth of washed sand below planting media soil
0.33 It
Are underdrains being installed?
Y
(Y or N)
How many dean out pipes are being Unstalled?
18
OK
What factor of safety Is used for sizing the underdraims? (See
2
OK
BMP Manual Section 12.3.6)
Additional distance between the bottom of the planting media and
1 ft
the bottom of the cep to account for underdralns
Bottom of the cell required
286.67 fmsl
SHWT elevation
284 fmsi
Distance from bottom to SHWT
2.67 ft
OK
Internal Water Storage Zone (MIS)
Does the design Include IWS
N
(Y or N)
Elevation of the top of the upturned elbow
fmsl
Separation of IWS and Surface
290 it
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 speeder to evenly distribute W
N
(Y or N)
Show how flow is evenly distributed.
Is the BMP located at least 30 feet from surface waters (50 feet If
SA waters)?
Y
(Y or N)
OK
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
to a public Right of Way (ROW)?
Y
(Y or N)
OK
Inlet velocity (from treatment system)
0.22 Nsec
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 bkuetentlon cols 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 ')C In the shaded cell)
Gravel and grass
(81inches gravel followed by 3-5 ft of grass)
Grassed swale
OK
Forebay
X
Other
Four sw401- 8loreW&n -Rev.e
June 2S. 2010 Parts I and 11. Design Summary, Page 2 of 2

0 ME
2
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submKW package will
resuft in a request for addklmW IMormation. This will delay Heal 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 spent, the agent may initial below. ff a
requirement has not been met, attach Justification.
Pagel Plan
Initial 8W HO.
C-1
1. Plans W- 50' or larger) of the entire site showing:
- Design at ultimate bull -out,
- Off -site drainage (if applicable),
- Delineated drainage basins (include Rational C coefficient per basin),
- Cep 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.
C --T
2. Plan details (1' = 30' or largo) for the bioretontion cell showing:
- Cep dimensions
• Pretreatment system,
- High flow bypass system,
- Maintenance access,
- Recorded drainage easement and public right of way (ROW),
- Design at ultimata build-out,
- Off -eilo drainage (if applicable),
- Clean out pipe locations,
- Overflow device, and
- Boundaries of drainage easement.
- Indicate the P -Index between 10 and 30
VC-5
3. Section view of the Woratention cell (1' = 2(Y or larger) showing:
- Sloe slopes, 3:1 or lower
- Underdrain system (if applicable), and
- Biaetentiom cell layers (ground level and slope, pre - treatment, polling depth, mulch depth, fig media
depth, washed sand, fitter fabric (o choking stone if applicable), #57 stone, underdrai ns (9 applicable),
SHWT level(s), and overflow structure)
4. A sops 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 DWO, by completing & submitting the sods
Investigation request form. County soil maps are not an acceptable source of sops information. All
elevations shall be in feet mean sea level (frost). Results of soils tests of both the planing soil and the in
situ soil must include:
- Sal permeability,
- Sou composition (% sand, % fees, % organic), and
- P- index.
5. A detailed planing 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 walerfng requirements to establish vegetation.
C •5
6. A construction sequence flet shows how the bioretention cep will be protected from sediment until the
entire drainage area is stabilized.
7. The supporting calculations (including underdrain calculations, 9 applicable).
B. A copy of the signed and notarized inspection and maintenance (I &M) agreement.
9. A copy of the deed restriction.
Form sw40149arenerdion-Rev.7
Pert III, Page 1 of 1

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fj4.j s Pob Af w 8
Skimmer Sediment Basin Worksheet
(Drainage Area Must be Less Than 10 Acres)
Area Disturbed = -7. co Acres
Runoff Area = 7.51 Acres
Quo = C X I X A =. X x i.4 x7-57
— . &(.0 cfs
Basin Volume Calculation:
Volume of Sediment = • d Ac.) x (1800 cf sed. /year) x (1 year)
2 &00 cf
Assume foot of basin depth, therefore area of the pit --1� Square Feet
Try ( wide) x ( long) x ( foot deep) Sediment Basin
Surface Area Calculation:
Surface Area (SF) = Quo x 325 sf /cfs
x 325 sf /cfs
=�sf
Surface Area —
Use ( wide) x ( 11 long) x ( .3 foot deep) Sediment Basin
Surface Area — de-
Weir Design and Velocity Check:
Qio = P9. G(a dfs; Q = CLH3n; H = [Q/CL]m
[ 19. �� / (2.68)( 2O )]213
= O•,4Y/ feet
Velocity Check -> ( )/( ZO ) ( O•Sf ) = M 3 fps, OK ✓ 3*'%/

Skimmer Orifice Design.
RE
at � 'maoao
—
Bmtn Water Staeps
Figure 2. Skimmer orifice diameter as a function of the basin volume and bashi doWatering Cane.
Basin Volume (From Worksheet:
Basin Dewatering Time (1 -3 Days):
2
Skimmer Orifice Diameter (From Chart): Z

Permit Number.
(to 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 BMW 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 will be watered
twice weekly if needed until the plants become established (commonly 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 be taken to prevent sediment from entering the bioretention cell.
- Once a year, a soil best 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:
Potential problemw.
How I will remediate the problem:
The entire BMP
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
Remove sediment and clogged
covered in sediment (if
stone and replace with clean stone.
applicable).
Form SW401- Bioretention O&M -Rev.3 Page 1 of 4

BMW element:
Potential problems:
How I will remediate the problenr.
The pretreatment area
Flow is bypassing
Regrade if necessary to route all
pretreatment area and /or
flow to the pretreatment area.
gullies 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
fertilizes application to establish the
ground cover if a soil test indicates
it is necessary.
Tree 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 best 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:
Potential problems:
How I will remediate the roblem:
The underdrain system
Clogging 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
or replace the drop inlet.
The receiving water
Erosion or other signs of
Contact the NC Division of Water
1733-1786.
damage have occurred at the
Quality 401 Oversight Unit at 919 -
outlet.
Form SW401- Bioretention O &M -Rev.3 Page 3 of 4

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:Flowers Plantation Pod NW 8
BMP drainage area number:NA
Print name:Rebecca Flowers
Title:Owner / Developer
Address:4880 NC 42 East. Clayton NC 27520
Date: l ---1 D - 13
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, T Mi ct'. ej 51y) ,4t , a Notary Public for the State of
U c-e , County of IJ"M , do hereby certify that
a6,- -cca -r—lowcrUs personally appeared before me this -J PH'
day of JMV 7.013 and acknowledge the due execution of the
forgoing bioretention maintenance requirements. Witness my hand and official seal,
1 1�1(X46iI, ST0^K�
Rey Putl(c
E,frl� W, IL C.
514�
SEAL
My commission expires S' Z " 70l45—
Form SW401- Bioretention I&M -Rev. 2 Page 4 of 4

GENERAL NOTES: (LOCAL JURISDICTION)
BEFORE YOU DIG,
CALL
NORTH CAROLINA
ONE CALL CENTER
www.ncocc.org
1. Any discrepancies In layout should be brought to the Engineer's
attention prior to construction.
2. Written dimensions supercede scaled dimension. All dimensions are
edge of pavement or face of curb, unless noted otherwise.
3. All materials, Installation, testing and Inspection of water and sewer
utilities to most current Johnston County standards.
4. All streets noted as "PUBLIC" shall meet NCDOT minimum standards
for subdivision streets.
5. All lots to be served by public water and public sewer.
6. A 10' utility, drainage and road maintenance easement Is reserved
along and adjacent to all street right of ways,
7. Flared end sections are to be used on both 'inlet and /or outlet ends of
storm sewer unless otherwise noted.
8. Fire hydrants are to be Installed as shown on plans.
9. Maintain minimum 3' cover for all water pipe.
10. Waterline pipe shall be SDR 21 class 200 PVu unless otherwise noted
and installed a minimum of 4' off edge of pavement.
11. Corporation stops shall be rated a minimum of 300 PSI.
12. Where Waterline Crosses:
A. Sanitary Sewers Waterline shall cross above and maintain 2'
vertical separation or 10' of horizontal separation. If this separation
cannot maintain or If waterline passes bel,6w sewer line then both
waterline and sewer line shall be class 50 ductile Iron pipe for a
minimum of 10' each side of crossing.
B. Storm Sewer: Where waterline crosses above maintain 1' vertical
separation.
If this separation cannot be maintained or where waterline and /or
sanitary sewer crosses below storm sewer,, waterline and /or sanitary sewer shall
be class 50 ductile Iron pipe for minimum; of 10' each side of crossing.
13. All gravity sewer line Is SDR 35 PVC except as follows: All sewer line
less than 3' deep or greater than 14' deep shall be minimum class 50
ductile iron.
14. Each prime contractor performing excavations or underground work
shall be responsible for the location of any existing utilities In the area
of their work. Notify the utility locator service (1- 800 - 632.4949) at least
48 hours prior to commencing construction it order that existing
utilities in the area may be flagged and staled. Contractor shall use
all care necessary when working in areas known or suspected to
contain underground utilities, including hand digging.
15. The contractor Is responsible for relocating c,7y existing utilities that
conflict with the proposed construction. In oddition, the contractor Is
responsible for repair and replacement of ory utilities, curb and gutter,
pavement, etc. that may be damaged during construction. Damaged
Items shall be repaired to at least the quolitf, of the original
workmanship. The contractor shalt field veri `y depth of existing utilities
and relocate if proposed grading causes utilf:;f cover to be less than
minimum required.
16. All temporary erosion control measures shall be inspected after each
rain event and necessary repairs shall be done as required.
17. Each lot shall have a 4" sewer service and a 3/4" water service provided.
Sewer service and water service .shall have 10' min. separation.
18. Water services are to be "ganged" where possible. Where "ganged"
service crosses under the road, the line muri. be 1". All service pipe
under , roads shall be sleeved.'
19. Waterline to be pressure tested at minimum 175 psi.
20. Ductile Iron pipe sanitary sewer must be Interior coated with Sewper Coat
or Protecto 401, per Johnston County requirements.
21. Contractor to test sewer & water line accordi=ng to Aqua North Carolina's
2012 standards.
1. Topographical data performed by True Line Surveying, Curk Lane, PLS, North Carolina.
Boundary Information supplied by owner, taken from approved planned building group plan set.
2. The contractor shall notify and cooperate with all utility companies of firms having facilities
on or adjacent to the site before disturbing, altering, removing, relocating, adjusting or
conne -acing to said facilities.
3. All excavation Is unclassified and shall include all materials encountered.
4. All structural fill material shall be free of all sticks, rocks, and clumps of mud.
5. Unusable excavated materials and all waste resulting from clearing and grubbing shall be
disposed of off -site by the contractor in an approved solid waste landfill.
6. Location of underground utilities are approximate and must be field verified. Contact the
NC One Call Center at least 48 hours prior to digging @ 1.800.632.4949. True Line
Surveying has only located the utilities that are above ground at the time
of field survey. Underground lines shown hereon are approximate or as reported by
various responsible parties. The surveyor does not guarantee that any underground
strucfi, res such as utilities, tanks and pipes are located hereon.
7. All pipe lengths are horizontal distances and are approximate.
8. All work shall comply with all applicable codes, regulations, and /or local standards Imposed
by local utility.
9. All construction and materials shall meet Flowers Plantation PUD appoved details and NCDOT
Standards, latest edition. All work within NCDOT right -of -way shall meet the specifications
and standards of NCDOT.
10. All concrete pipe is to be ASTM C -76, Class III with ram -nek.
11. This property is not located In a Flood Hazard Zone per FEMA Map.
12. All lot dimensions shown are approximate. Consult the boundary survey of actual site
boundary information.
13. An evaluation of 404 jurisdictional wetlands was conducted. Wetlands are shown on
the plans.
14. The contractor shall be responsible for all work zone traffic control In or adjacent to NCDOT
right -of -way. All signs, pavement markings and other traffic control devices shall conform
to the Manual on Uniform Traffic Control Devices (MUTCD), 1988 edition as amended.
15. Prior to placing CABC stone base, the contractor should notify the Geotechnical Engineer to
inspect and proof roll the subgrade. Any stone place without prior approval will be the sole
responsibility of the contractor.
16. DESIGO/FIELD CONDITIONS quite easily may vary from that represented In the Initial
soils report and /or topographical report. Isolated areas may show up weak and adverse
soils or groundwater conditions may be discovered that were not revealed during the Initial
soils investigation. Therefore, the Contractor is to be aware that Stocks Engineering, P.A.
will no;f and cannot be held responsible for any failures to either a street or parking
lot pa cement design as a result of soil conditions.
17. All utility services, (power, telephone, cable, etc.) are proposed to be underground. Do not
seed cr mulch disturbed areas until all underground utilities have been installed. Utility
Contractors to bring Main Services to R/W as shown in plans.
18. All Iln *s that wrap around cut -de -sacs shall have the proper size and degree
rnecho:nical joint (MJ) elbows installed.
19. Property is to be served by Public (Aqua America) Sewer and Water.
20. No taps shall be made into the existing Village at Flowers Plantation system without prior 48 hours
to Heater Utilities, Inc. An Inspector from Heater Utilities shall also be present at the time of the tap.
21. Regulatory signs, stops signs and street name signs shall be manufactured from high
intensii ',y reflective materials.
22. All ex:cass topsoil and unclassified excavation is to be hauled off -site, unless otherwise
directaid by the owner.
23. All site construction must be Inspected by The Project Engineer or Architect at the following
stagea:
A. Completion of grading subgrade prior to placing Stone Base.
B. Completion of Stone placement prior to paving.
C. F'Inal Inspection when all work is complete.
24. The surveyor did not visibly see any cemeteries in any open areas unless otherwise noted.
25. This property does not depict encumbrances that are found during a thorough title search.
26. Concrete Sub shall be responsible for all score joints and expansion joints.
27. All ors -site curb and gutter to be as shown on plans. Curb and gutter within NCDOT
right -of -way to be 30" standard.
28. All curb and gutter and sidewalk concrete Is to be minimum 3,000 psi at 28 days, air
entrained.
29. Contrc :tor to furnish all paint striping as shown.
30. All dimensions are to edge of pavement (EOP) unless Indicated otherwise.
31. Contractor SHALL NOT POUR any concrete before forms are inspected by the Civil
engine -er and /or owner. Any concrete that has not been approved by the engineer and /or
owner will be the responsibility of the contractor.
32. Contractor shall saw -cut to provide smooth transitions where existing asphalt and /or curb
and gutter Is to be removed.
33. The contractor shall provide all the material and appurtenances necessary for the complete
installation of the utilities. All pipe and fittings shall be inspected prior to being covered.
A mir,..'mum of 24 hours notice shall be given to the inspector prior to covering pipe or blockings.
34. lnforrnatlon concerning underground utilities was obtained from available records and field
conditt�ons when possible, but the contractor must determine the exact location and
elevation of all existing utilities by digging test pits by hand at all utility crossings well in
advance of trenching. If the clearances are less than specified on the plans or 12 Inches,
which ever is less, contact the project engineer and the Owner prior to proceeding with
construction.
35. The contractor Is responsible for the design and Implementation of all required /necessary
sheeting, shoring, and special excavation measures required on the project to meet OSHA,
Federal, State and Local regulations pursuant to the installation of the work indicated on
the drawings. The Owner and Stocks Engineering, P.A. accept no responsibility for the design
to install said items.
36. The ccntractor shall Include in the contract price daily record keeping of the as­wbuilt
condition of all of the underground utilities, construction stakeout associated with the
project. Preparation of the necessary /required as -built plans to be submitted to the city of
Clayton and all other information required In connection with release of bonds.
37. All water line and sewer line installation shall conform to the standards and details of the
Heater Utilities and the State of forth Carolina Department of Health Construction Permit.
38. The Lcnd Disturbance Permit must be kept on the work site and shown upon request.
39. The c«ntractor` shall Include In the contract price all material and labor associated with the
testing of the water and sewer lines required by Aqua America.
40. The cccnfroctor shall Include in the contract price any de- watering necessary to construct
the project as shown on the plans.
41. The acntractor shall include In the price, any and all costs associated with providing a
professional engineer on site If required, during the construction of the storm water
management facilities, underground utilities, etc. as required for as -built certification.
42. All grass, topsoil and 'building debris material' dumped onsite shall be_ removed in the
base 'bid prior to placement of structural fill material.
43. All geroerated waste shall be disposed of off -site in an approved landfill location.
44. Rip -Ratio shall be placed on . ditch back slopes to prevent scouring of ditch bank.
45. Marker, Balls shall be installed per Johnston County Specifications and a #12AWG THHN
insula*ed locating wire shall be installed per Aqua America Specifications.
J
OwnerlDeve�qper:
The e l Compa
-4880 NC 42 East
Clayton, 0 I

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CURVE TABLE
CURVE
11 LENGTH
I RADIUS
DELTA
TANGENT
CHORD DIRECTION
CHORD LENGTH
Cl
221.37
810.00
15 9'427
111.38
N45°11 '44"E'
220.68
C2
236.32
1690.00
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1 118.35
1 S41.26'1 "W
236.12
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EROSION LEGEND
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TOP DAM 150.99
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PERFORATED PVC SOCK DRAIN
1. After the site is completely stabilized, contact Stocks Engineering 0 252 - 459 -8196 for verification
of completion and stabilization.
2. Contact Thad Valentine of NCDENR —Land Quality Section 0 919 - 791 -4200 for approval to remove
all temporary erosion control measures.
3. Upon approval from NCDENR —Land Quality Section, berg^ the conversion of the bioretention area
from a temporary sediment trap to a permanent BMP cs follows.
4. Construct silt fence around the toe of the interior side slope of the bioretention area (BA) to
protect the BA from sediment contamination during tixe Conversion Procedure. Leave an opening at
the downstream and of the BA just wide enough for construction machinery to enter /exit.
5. Bring the side slopes surrounding the BA to proposed grade.
6. Seed /sad the side slopes as per specifications. (Contractor Is responsible to maintain and
protect seed /sod to promote successful establishment during Conversion Procedure. If damage or
death to seed /sod occurs, Contractor must replace affected area immediately.'
7. Once seed /sod has been Installed, Contractor shall exc4vate the bottom of the BA to a depth
equal to the greater of the following:
a. 1 foot below any evidence of sedimentation upon in situ soils, or,
b. 4 feet below the proposed bottom of BA elevation.
9. Excavated material must be disposed of in an approveld off —site location.
9. Care must be taken to prevent any sedimentation /re— sedimentation during this process, as
contamination of the In situ soils or the designed soil .media will compromise the functionality of the
BA. If any sedimentation occurs during this process. Contractor shall remove sediment Immediately.
10. Contact Stocks Engineering 0 252-- 458 -8196 to Inspect excavated BA before continuing
construction.
11. Upon approval of Stocks Engineering, continue constn cG,�ng BA per details. Establish appropriate
permanent vegetation In BA as soon as possible.
12. Upon completion of BA construction, remove sediment from alit fence and dispose of at an
approved off —site location.
13. Contact Stocks Engineering 0 252- 459 -8196 to [nape.--.', completed BA before removing slit fence
and placing the BA in service.
NOT i SCALE
SOCK DRAIN
6" 157 STONE
WASHED SAND
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