20071658 Ver 2_Stormwater Plans_20080410

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Prepared for:
NEUSE PARK DEVELOPMENT CO.
Clayton, NC 27527
January 200$
S&EC Project No. 9197.D1
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Soil & Environmental Consultants, PA S&EC Project No 9197.D1
Taft. Woods East January 2008
~~b'Ctr'C~ '~.OG.:til0~'~
The project site is located in Johnston County, NC. The property is owned by Neuse
Park Development Company and consists of approximately 126 acres located 0.2 miles.
west. of thee. intersection of Motorcycle Road and NC Highway 42 East.: See Figures 1 and
2.

Level spreaders are proposed for the distribution of concentrated stormwater on this
residential development. in order to comply with the diffuse flow requirements within thee.
Tar-Pamlico River Basin. Proposed impervious. for this.projects drainage area is 15 % as
indicated in the 401 Water Quality Certification Application. As such; no specific
stormwater treatment is required for this project beyond diffuse flow requirements. The.
401. Water Quality Certification wasapproved October 15, 2007.
A total of seven (7) drainage areas were evaluated for stormwater runoff and 1level
spreader sizing. In one case, a small. detention pond is proposed to buffer the runoff peak
and allow for the .controlled release of stormwater through a level spreader. Where
necessary, pipes will be used to:convey stormwater from the roadside wales o level
spreaders. All proposed pipe, level spreader, and .detention pond locations are shown on
the attached Construction Drawings. The level spreader design is based on guidance
from the July 2007 NCDENR-DWQ BMP manual.
L,ev~l Spread~~' ~'~~~~n_m ~E~~ ~:'. V~~~s~~~
Calculations for the sizing of level spreaders and. their components were performedtiby
Soil & Environmental Consultants, PA (S&EC). All necessary stormwater design
calculations and supporting documentation are attached..
Based on existing and proposed topography, the site was divided into seven (7) different
drainage areas. Stormwater captured from :each of the contributing watersheds is
conveyed (primarily through grass-lined roadside. ditched designed by Dennis Ray
Blackmon, R.L.S) to an appropriate level spreader location where it can be released in
the form of diffuse flow through the adjacent stream buffer (or equivalent filter strip)
upslope and outside of a stream buffer.
All of the level spreaders were sized based on the total contributing drainage area for the
1-nch/hour design rainfall. Utilizing. the Rational Equation, we then calculated a design
discharge for each drainage area. Based on his discharge and the vegetation. in the
downslope buffer,. the length of the level spreader was then calculated. All but one
(Drainage. Area 3) of the. calculated level spreader lengths fell within. the acceptable
range.: The level spreader that exceeded the maximum length was redesigned such that a
wet detention basin that would collect the stormwater, detain it, and only release a
discharge suitable for theernaxrnum level spreader length (in this case 130 feet). The
outlet of the wet detention basin to the level spreader will be at a rate that: allows the level:
of 3

Soil. & Environmental .Consultants, PA S&EC Project No 9197.D1
Taft. woods Easy January 200$
spreader length to fall within the acceptable range. No forebay.will accompany this level:
spreader since the :forebay of the wet detention basin will provide the necessary settling
of suspended sediments. This wet detention basin was designed to store and outlet. the
10-year event (at the appropriate allowable discharge rate) to the level spreader, and as
such, no bypass channel will be:required for this level spreader either.
For the remainder of the level spreaders, bypass channels have been designed to convey
the discharge associated with a 10-year event in accordance with the September 2007
B1VIP manual. Attached is the required PreconstructionNoticc. for the. Riparian Buffer
:Authorization for: each of the bypass:channels.
The forebays in this project have been designed to ettle suspended sediments as well as
o split the stormwater flow to the level spreader and the bypass channel. The forebays
:have been fitted with an appropriately ized pipe that discharges. to the swale upstream of
he level spreader. Each pipe is sized for the discharge associated with the 1-inch/hour
storm event for the watershed and is anchored in a concrete wall that discharges t© he
1level spreader as shown in the Construction :Drawings. For each flow splitter, the pipe
was sized using the orifice equation. where the discharge calculated with the maximum
:head (depth of water) above the pipe was sized to the discharge. of the 1 inch/hour storm.
The invert of the bypass channel from the forebay was set at a specific height above the
invert elevation of the pipe leading to the level spreader.. The vertical distance between
the bypass channel invert and the pipe invert was set to be equal. to the maximum desired
:head (water depth) above the pipe.: This design allows any flow entering the :forebay up
to and equaling the l inch/hour storm. to flow through the pipe to the level spreader.
Once the #1ow entering. the forebay. exceeds the l inch/hour storm, the bypass channel
:will be activated. Again,:each bypass channel was sized o convey discharges up to and.
including the 10-year event.
Based on the soils located at the proposed level spreader locations, all of the swales
located upslope of the level spreaders. willnaturally drain within 24 hours, and therefore.
no underdrans arenecessary. Caution will be applied during construction to reduce the
potential for compaction of underlying soils, Site soils were deemed. sufficient to drain
:naturally based on permeabilites greater. than 0.6:inches per hour.
2 of 3

Soil & Environmental Consultants, PA S&EC Project No 9197.D1
Taft woods East January 2008
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I. Level Spreader and Wet Detention Pond Calculations 36 pages
II. NCDENR Level Spreader, Filter Strip, and Restored Riparian Buffer
Supplement Worksheets, Checklists, and Photos of Proposed Level
Spreader. Locations 28 pages
III. Filter Strip, Restored Buffer, and Level Spreader Inspection &
Maintenance Agreements 25 pages
IV. Riparian Buffer Authorization Pre-construction Notice 19 pages
Figures:
Figure 1 - USGS Map
:Figure 2 -Soils Map & Aerial Photo

Sheet 1 - Cover, Contents, ~ Vicinity Map
:Sheet 2 - :Existing Site Conditions
Sheet 3 - .Proposed Development
Sheet 4 - .:Proposed Stormwater BMP Dranage.Areas
Sheet 5 - Proposed Site Conditions Sheet DA #1
Sheet 6 - Proposed Site Conditions Sheet DA #2
:Sheet 7 - :Proposed Site Conditions Sheet DA #3
Sheet 8 - Proposed Site Conditions Sheet DA #4
Sheet 9 - Proposed Site Conditions Sheet DA #5
Sheet 10 -Proposed Site Conditions Sheet DA #6
Sheet l 1 -Proposed Site Conditions Sheet DA #7
Sheet 12 - Construction Sequence & Temporary Seeding: Specifications
Sheet 13 - Level Spreader & Flow Sputter Details
Sheet 14 - Erosion Control Details
Sheet 15 - WetDetention Basin Details
Sheet 16 -Emergency. Spillway & Outlet Protection Apron Details
3 of 3

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ATTACHMENT I
LEVEL SPREADER AND WET DETENTION POND CALCULATIONS

Level Spreader Design Spreadsheet
Di". #1
:Taft Woods
S&EC Project No. 9197.D1
I. Determine Contributing Impervious Area and tin/hour Discharge Rate
1, Weighted Rational Coefficient, C = F[C;*%°A;]
C; _ Rational coefficient for development. area i
A =Area
Total Drainage Area ° 5.02 acres
Development. Area: (ft 2) Area (ac.) % Area Rational C % Area * C
:Lots -Impervious (roof, parking, etc.:) 27582.25 ::0.633 12.6%0 4.95 0.120
Lots -Forested.: 0.00 -0.000 0.0% 0.15 D.000
Lots -:Lawn (maintained grass) 123377.48.::2.832 56.5%° 0.2 0.1.1:3 :
Impervious (Roads) 28776.55 0.661 13.2°!° 0:95 0.125
: Road. Easements: (maintained grass) .38781.55 :::0.890 17.7% 0.2 0.035:
total:,:: 218517.83 5.016 0.393:
:::::weighted rationaB coefficient; C = :::0.393
impervious drainage area = 56358.79 ftz
total drainage area = 218517.83 ft2
2. Discharge Rafe , Q = C~i*A, cfs
::::Rational Equation, Applied Hydrology by Ghow, pp. 497:: :
C =Weighted rational coefficient:..
i =Rainfall intensity
A =Drainage: area, ft2
C = 0.393
i = .::1.00 in/hour:::
A = 5.02 acres
Q = 9.97 cfs
II. Sizing the Forebay
Forebay Area , Ar°~°aay ° 0.2%(A~mP.), ft2
AomP ° Contributing impervious area, ftz
A;mp, = 56358.79 ftz
p'(oretiay = 112.72 ft`
Ill. Determine Level Spreader Length ~ Slope Chec?:
"'Choose one of the following, a-d
.:::Level Spreader Design Guidance by DWQ
a: Grass or hick ground cover vegetation `--13 feet of level preader per 7 cfs of flow: :
b: Forested with little/no ground cover vegetation and 50-foot vegetated buffer `--65 feet of levelspreader per 7 cfs of flow
c: Forested with little/no ground cover vegetation and 100-foot vegetated buffer °--50 feet of leuel preader per 9 cfs of flow: :
d: Forested with little/no ground :cover vegetation and 150-foot vegetated buffer °--40 feet of level spreader per 1 cfs of flow.
.Cover: b (a, b, c, or d from above)
Total discharge, Q = 1.97 cfs
Length of level spreader = 128.29 ft
Check: Level spreader is within allowable length requirements of greater than 13 feet and less than 130 feet..
.Page 1 DA 1

s =Slope of ground downslope of level spreader _ [Elev:urs-Elev.oisl/L= ft/ft
Elev:urs =Elevation at level spreader, ft
Elev.prs =Elevation at stream bank (or at the edge of a 50' vegetated buffer or filter strip), ft
L =.Length from level spreader to stream (or edge of 50' buffer or filter strip),: ft
Elev:urs = 209.15 ft
Elev:ors = 205.75 ft
L= .:.71.54... ft
s =_ _ 0:0475_ ft/ft
Check: Slope is less than 6%.
11f. Determine Bypass Channel Design Flow (i2iprap Lined or Grass Swale}
1. Time of Concentration ; T~ = 0.0078*Lo.ns-o.aes min
Kirpich Equation, Applied Nydroiogy by Chow, pp. 500
L =Flow length from. headwater to outlet {ft)
H = Elevatoh difference from headwater to outlet (ft)
S =Average slope = H!L (ft/ft}
L = ::1206.9. ft
H = 70.0 ft
S = 0.058 ft/ft
TO = 5.51 min
2. 70-Year Storm Intensity; i7~ based on :Intensity-Duration-Frequency. (IDF} Table
i~o = 10-year intensity that occurs at the time of concentration, T~
TABLE 1. INPUT
Location: Taft Woods East.::: :
Duration: 2 yr 100 yr Source
(in) f n)
5 min: 0:48:: :::0.81 NOAA Hydro 35
15 mine. 1.03 1.88 NOAA Hydro 35
60 mine 1.83 3.80 NQAA Hydro 35
24 hr 3.70:: .8.30 USWB TP 40
TABLE 2. DEPTH -DURATION:- FREQUENCY:: TABLE 3::INTENSITY - DURATION -FREQUENCY
Duration 2 yr 10 yr 100 yr 2 yr 10 yr 100 yr
H-1 * (in} (in) (in) Duration (ih/hr) {in/hr) (in/hr)
5 min * 0.48:: :0.60 .::0.81 5 min 5:80 :::7.22 9:68:
10 min 0:81 1.05 1.44 10 min 4.83 6.28 8.64:
15 min * 1.03:: :1.36 :::1.88 15 min 4.:12 :::5.42 7:52:
30 min 1.42 1.97 2.82.:::: 30 min 'L.84 3.94 5.64:
60 min * 1:83 2.61 .::3.80 60 min 1.83 2.61 3.80
2 hr * 2.04 2.94 4.30 2 hr 1:02 .. ...1.47:::: .2:1:5:
3 hr * 2.24 3.26 4.79 3 hr 0.75 1.09 1:60
6 hr * 2.77:: .:4.09 6A5 6 hr 0.46 :::0.68 1:01
12 hr * 323 4.82 7.18.:::: 12 hr 0.27 0.40 0.60:
24 hr " 3.70:: .:5.56 ::8.30 24 hr 0.15 0.23 0.35
From Eqs. lif-(1-3), p.l(J-(4-5), Stormwater Management: Vol.l Intensity = Depth /Time
Urban Hydrology, B,H.Bradford, N.S.Grigg, L.S. Tucker:
To = ::5.51 ::min
3. 10-Year Discharge Rafe , Qio = C*i~o*A, cfs
C =Weighted rational coefficient
i~o =Rainfall intensity associated with 10-year storm, in/hour
A =Drainage area, ft2
C = ...0.393
i,o = 7.22 in/hour
A = 5.02 acres
Q7o = 14.26 cfs
Page 2 DA 1

V. Bypass Channel: Specifications:
1. Calculated Depth of Flaw. using Normal-Depth Procedure
s = Channe! lope = [Elev.uis-Elev.orsl/L, ft(ft
Elev:urs =Elevation at evel .spreader, ft
Elev. ors =Elevation of stream bank, ft
L =Length of channel from level spreader to stream, ft
Elev.urs = ::209 ft
Elev.ors = .::204 ft
L = .:84.23 ft
s = 0.0594 ft/ft
2. Bypass Channel Dimensions (for trapezoidal channel)
a) Cross-sectional Area, AX = G2,o1Va, ftz
Q,q ° 10-year design flow, cfs
Va =Chosen to be less than the maximum allowable channel velocity, 5 fps for the 10-yr event according to the NC Erosion &
Sediment Control Planning and Design Manual table 8.05a for a Berrnudagrass lined channel
Qia = 14.26 cfs
Va = 5 .:fps
AX = 2.85 :.ftz
b) Working Constant, wi = M - 2~y[1+Mz]
M =Side slope ratio (HiV)
M = 3 H:1V
w~ _ -3.32 ::(will always be negative).::
c) Working Constant, wz = AX/[[(Va*n)/(1.49,r~)]srzl
Ax =Channel cross-sectional area, ftz
V~ =Chosen to be less than the maximum allowable velocity
n = Manning's roughness coefficient [0.030 for grass-lined; D.033 for riprap-lined (Applied Hydrology by Chow, Table 2.5.1, pp. 35) ]
s =Channel lope, ft/ft
Ax = ::2.85 ::ftz
Va = 5 :::fps
n = ::0.030
s = 0.0594 ft/ft
wz = 10.73
d) Depth. of Flow,: d = [-wz + \,twzz+4w,Ax)1/2w~, ft
wa =Working constant
wz =:Working: constant::
AX =Channel cross-sectional area, ftz
w, _ -3.32
wz = .:10.73
AX = 2.85 ......ftz
d = 0,292 ft
e) Bottom Width of Channel, B = Ax/d - M*d, ft
AX =Channel cross-sectional area, ftz
d =Depth of flow, ft
M =Side slope ratio (N:V)
AX = .:2.85 ::ftz
d = 0.292 ft
M = 3 H:1 V
__B= 8.89 ft
.:Page 3 DA 1

f) Top Width of Channel, t = B+(2'd'M), ft
B =:Bottom. width of channel, ft
d = Depth of flow, ft I t
M = Side slope ratio (H.V)
B = 8.89 ft
d = 0.292 ft 1
M= 3H;1V__ M
t = 10.64 ft ~ B
3. Velocity Check:
a) Wetted Perimeter, P = B+2dytM~+1], ft
B ° Bottom width of channel, ft
d = Depth of flow, ft
M = Side slope ratio (H:V)
B = .::8.89 ft
d = 0.292 ft
M= 3 H:1V
P= .::10.73 ft
b) Hydraulic Radius, R = A/P
Ax =:Channel. cross-sectional area, ftz
P = Wetted Perimeter; ft
AX = ::2.85 ~z
_P= 10.73 ft
R = 0.266 ft
c) Bypass Channel Velocity, v = (1.49in}'Rz~s~Suz :fps
°--velocity must be less than 5 fps according to E&S Control Planning and Design Manual - Grass-Lined Channels
n = Manning's roughness coefficient (0.030 for grass-Lined; 0.033 for riprap-lined (Applied Hydrology by Chow,: Table 2.5.1; pp. 35) ]
R =hydraulic. radius, wetted cross-sectional area (A) /wetted peremeter (P}, ft
s =Channel slope, ft/ft
n = 0.030
R = 0.266 ft
s = 0.059 fbft
~/ _ .::5.00 .::fps
Check: Velocity is within allowable maximum velocity for Bermudagrass lining. Atemporary lining of erosion control
matting will be used forstabilization until grass is established.
d) For this depth; the resulting shear stress is then:
Shear Stress,: T = yds, Ibiftz
y =Unit weight of water,: 62.4 Ib/ft3
d= Flow depth, ft
s = Channel gradient, ft/ft
y _ 62.40 Ib/ft3
d = -0.29 ft
s = 0.059 ft/ft
T = _ 1.1 Ib/ftz
This hear stress is under the permissible unit shear stress (2 Ib/ft?) for synthetic mat (erosion control. matting} as stated in the: NC
Erosion & Sediment Control Planning and Design Manual, Table 8,05g.
1l1. Flow Splitter (Forebay) Specifications
Using the orifice equation, Q = Gd*A"(2*g*h)i~rz}
a} Pipe Gross-sectional Area, APiPe = (~4]d2, ftz
d =:Diameter of pipe from Forebay to flow glitter, in
d = 8 inches
z
Apipe = 0.3489 ft
Page 4 DA 1

b) Head Above Bypass Pipe, h = [(Q/(Cd*A))2]/2*g,
(solving for head above pipe that will be equal to the elevation of fhe bypass channel invert above the pipe to the Jevel spreader)
Q =Discharge, cfs (1 in/hr discharge)
Cd =Discharge:coefficient [0.6 for sharp-edged. orifice]
AP;Pe =Pipe cross-sectional area,: ftZ
g =Gravitational acceleration; ft/s2
h =:Height of water above the orifice (head), ft
Q = :::1.97 cfs
Cd = 0.6
APipe = 0.3489 ft`
9 = :::32.2 ftls2
h=__1.38_ ft___
'JIL Swale Drainage Calculations
The following. calculations use Darcy's law to calculate. the time. (in hours) that it will cake far the Swale upslope of the
lever. spreader to naturally drairrbased on the permeability of the in-situ soils:.
a) Surface Area Draining to !n-Situ Soil , A = L*W; ft2
L =Level spreader length, ft
W =Width of Swale upslope of level spreader; ft
L = 128.29 ft
W= 3 ft
A = 384.86 ftZ
b) GroundwaterFlow, Q = (K*i*A)/43200, cfs Darcys Law
K = Average coeffcieht of permeablilty, in/hr [4 ih/hr based on Padolet Loarn soils from 0 to 8 inches ih depth]
..-based on the Johnston County Soil. Survey (MRCS)
i =:Hydraulic gradient [assumed. to equal 1]
A =:Surface area draining to in-situ soil, ftz
__K= __ 4 __in/hr
i= 1
A = 384.86 ft~
Q = 0.0356 cfs
c) Volume Draining to In-Situ Soil; V = d*A, ft2
d =Depth of water draining to in-situ soil, in
A =Surface area draining to in-situ soil, ft
d= __ 6 __in
A = 384.86 ft3
V = 192.43 ft3
d) Time to Drain the Swale = V/Q, sec
V =Volume drained, ft3
Q =Groundwater flow, cfs
V = 192.43 ft3
Q = 0:0356 cfs
Td = .::5400 s
Td = 1.50 hr
Check;. .:Since the water held in the wale after the level spreader has been activated will naturallydrain irrJess than 2~
hours, no underdrain will be necessary.
Page 5 DA 1

Level Spreader Design Spreadsheet
DA #~ ::: ::: ::: ::: ::: ::: ::: ::: ::: ::: ::: ::: ::: ::: ::: ::: ::
Taft Woods
S&EC Project No. 9197.D1
I: Determihe Contributing Impervious Area and 1 in/hour Discharge Rate
1. Weighted Rational Coefficient, C = E[C;*%A;]
C =Rational coefficient for development area
A =Area
Total Drainage Area = 1.23 acres.::
.::Development Area (fl 2) Area: (ac.) % Area:: Rational C % Area " C
Lots -Impervious {roof, parking, etc.) 7400:32 0.170 13.8% 0.95 0.131
Lots- Forestetl 0:00 0.000 0.0% 0.15 0.000
:::Lots -:Lawn (maintained grass) 28982.12 b.665 54.0% b2 0.108
impervious: (Roads) 6913.90 0.159 12.9% 0.95 0.122
: Road Easements:(maintained grass) 10386.99 .:0.238 :::19.3°/a 0:2 :::0.039:::
total: 53683.34 1.232 0.400.: :
weighted rational coefficient; C = 0.400

impervious drainage area = 14314.22 ft
total drainage areas= .:::::53683.34 ftz

2. Discharge Rate, Q = C*i*A, cfs
:::Rational Equation, Applied Hydrology by Chow; pp. 497
C =Weighted rational coefficient:
i =Rainfall intehsity (typical 1 ih/hour}
A =Drainage area, ft2
C = 0.400
i = 1:00 inlhour
A = 123 acres
Q = 0:49 cfs
If. Slzing the Forebay
1=0relJay Area ~ Aforebay e 0.2%(Aimp.), ftz :: :: :: :: :: :: :: :: :: :: :: :: :
A;mP. ° Contributing impervious area, ft2
A,mP, = 1.4314.22 ftz

_ft?
AttireUay = 28.63
IILDetermine Level Spreader Length & Slope Check
"`Choose one of he following, a-d
Level Spreader Design Guidance by DWQ
a: Grass or thick ground cover vegetation '--13 feefaf level spreaderper 9 cfs of flow
b: Forested with little/no ground cover. vegetation and 50-foot vegetated buffer '--65 feefof level spreader per 7 cfs of flow
c: Forested vvith little/ho ground covervegetatioh and 100-foot vegetated buffer '--50 feefdf level spreadefper 1 cfs of flow
d: Forested: with little/no ground cover: vegetation and 150-foot vegetated buffer ~--40 feet of level spreader: per 1 cfs of flow
Goer: b (a, b, c, ar d from above)
Total discharge, Q = 0.49 cfs
Length of level spreader = 32:04 ft

Check: Level spreader is within allowable length requirements of greater han 13 feet. and less harc 130 feet.: :
Page 1 DA 2

s =Slope of ground downslope of level spreader _ [EIev.U~s-Elev.o~sllL, ft/ft
Elev.urs =Elevation at level. spreader, ft
Elev.ofs = Elevation at stream bank (or at the edge of a 50' vegetated buffer or filter strip),: ft
L =Length from level spreader to tream (or edge of 50' buffer orfilter strip), ft
Elev.u~s = 234.36
Elev.o~s = 229.97
L = 73.52
s = 0.0598
Check: Slope is less than 6%.
IV. Determine: Bypass Channel Design F]ow (Riprap Lined or Grass Swale)
1. Time of Concentration , T~ = 0.0078*L0.77S.-0.385 min
Kirpich Equation, Applied Hydrology by Chow, Pp• 500
L =Flow: length from. headwater to outlet (ft)
H =Elevation difference from headwater to outlet (ft)
S =Average slope = H/L (ft/ft)
L = 511.0 ft
H = 28.0 ft
S = 0.055 ft/ft
T~ _ 2.90 min
2. 70-Year Storm tnfehsity, i~o based on Ihtensity-Duration-Frequency (IDF) Table
i~o = 10-year intensity that occurs at the time of concentration, T~
TABLE 1. INPUT
Location: Taft Woods East : :
Duration: 2 yr 100 yr Source
(in) (in)
5 min 0:48 0.81 NOAA Hydro 35
15 min 1:03 1.88 NOAA.Hydro 35
60 min 1:83 .:3.80 NOAA Hydro 35
24 hr 3:70 8.30 USWB TP 40
TABLE 2, DEPTH -DURATION -FREQUENCY TABLE 3. INTENSITY - DURATION -FREQUENCY
Duration 2 yr 10 yr :::100 yr 2 yr 10 yr 1:00 yr
H-1 * (in) (in) (in) Duration (in/hr) (in/hrJ (in/hr)
5 min * 0:48 0.60 0.81 5 min 5.80 7.22 9,68
10 min 0:81 ::1:.05 1.44::: 10 min 4.83 6.28:: .8:.64
15 min * 1 A3 1.36 1.88 15 min 4.12 5.42 7.52
30 min 1:42 ::1:.97 2.82 30 min 2.84 3.94:: .5:.64
60 min * 1:83 2.61 3.80 60 min 1.83 2.&1 3.80
2 h~ 2:04 2.94 4.30 2 hr 1.02 1.47 2,15
3 hr * 2:24 ::3.26 4.79::: 3 hr 0.75 1.09:: :1:.60
6 hr * 2:77 4A9 6.05 6 hr 0.46 0.68 1.01
12 hr 3.23 :4.82 7.18 12 hr 0.27 0.40 0.60
24 hr 3.70 5.56 8.30 24 hr b.15 0.23 0.35
From Eqs. III-(1-3), p.lll-(4-5), Stormwater Managemeht: Vol.l Intensity= Depth /Time
Urban Hydrology. B.H.Bradfard; N.S.Grigg, L.S. Tucker
T~ _ 5.00 min
3. 70-:Year Discharge Rate, Qto = C*i~o~A, cfs
C =Weighted rational coefficient
i70 =Rainfall intensity associated with 10-year. storm; in/hour
A _ Drainage area, ft2
C = 0.400. :
iia = 7.22 in/hour
A = 1.23 acres.:
Page 2 DA 2

Q+o = 3.56 cfs
V. Bypass Channel Specifications. :
1. Calculated Depth of Flow using Norma!-Depth Procedure
s = Channel slope = [Elsv.urs°Elev.ots]/L, ft/ft
Elev,urs = Elevation at level spreader, ft
EIev.Drs = Elevation at stream bank, ft
L =Length of channel from level spreader to stream, ft
Elev.urs = 234.39 ft
Elev.ofs = 230.86 ft
L = 65.07 ft
s = 0.0542 ftlft
2. Bypass ChanneiDimensions (for trapezoidalcharmel)
a) Cross-sectional: Area, Az = Q,oNa; ftz
Quo = 10-year design flow, cfs
V®_ Chosen to be less than the maximum allovvable channel velocity, 5 fps for the 10-yr event according to the NC Erosion &
Sediment Control Planning and Design .Manual table 8.05a for a Bermudagrass lined channel
Qua = .:3.:56 .::cfs
Va = 3.4 .fps
AX = 1.05 ft?
b) Working Constant, w~ _ M - 2"yt1+Mz]
M =Side slope ratio (H:V)
M = 3 H:1V
wi = -3.32 .:(will always be negative)
c) working constant, wz = AX/[[(Va`n)1(1.49,fs)lsrz]
Ax = Channel cross-sectional area, ftz
Va = Chosen to be less than the maximum allowable velocity
n = Manning's roughness coefficient [0.030 for grass-lined; 0.033 for riprap-lined (Applied Hydrology by Chow, Table 2.5.1, pp. 35) ]
s = Channel slope, ft/ft
AX = :1.05 ft~
Va = 4.5 ::fps
n = : 0.030
s = 0.0542 ft/ft
wz = 4:32
d) Depth. of Flow,. d = [-wz + y(wzz+4w~AX)]/2w7, ft
wti = Working constant
wz = Working constant : :
AX = Channel cross-sectional area, ftz
w~ _ -3.32
wz = ::4:32
Ax = 1.05 fta
d = 0.323 ft
e) Bottom Width of Channel, 13 = Ax/d - Mid, ft
Ax = Channel cross-sectional area:, ftz
d =Depth of flow, ft
M =Side slope ratio (H;v)
AX = .1.05 ftZ
d = 0.323 ft
M = 3 H:1V
Page 3 DA 2

B = 2.27... ft
f) Top Width of Channel, t = B+(2*d*M), ft
B ° Bottom width of channels ft
d = Depth of flow, ft f ~
M = Bide slope ratio (H:V)
B = 2.27 ft d
d = 0.323:: ft 1
M= 3 H:1V M
t= 4.21 ft ~~ B
3..Velocity Gheck
a) Wetted Permeter,.P = B+2d~r(Mz+1], ft
B = Battorn width of channel, ft
d =Depth of flown ft
M =Side slope ratio (H:V)
B = 2.27 ft
d = 0.323 ft
M = 3 H:1 V
P = 4.32 ft
b) Hydraulic Radius, R = A!P
AX =:Channel cross-sectional area, ft?
P =Wetted :Perimeter, ft
Ax = 1.05 ftz
P = 4.32 ft
R = 0.243 ft
c) Bypass Channel Velocity, v = (1.49/n)*Rzra*Svz fps
°--velocity must be less than 6 fps according to E&S Control Planning ahd Desigh Manual - Grass-Lined Channels
n _ Manning's roughness coefficient [0:030 for grass-dined; 0.033 for riprap-lined (Applied Hydrology by Chow, Table 2.5.9, pp. 35) ]
R =Hydraulic radius, wetted cross-sectional area (A)l wetted pereimeter (P), ft
s = Channel slope, ft/ft
n = 0.030
R = 0.243 ft
s = 0.054 ft/ft
V = 4.50 fps
Check: Velocity is within allowable maximum velocity for Bermudagrass lining. A temporary lining of erosion control
matting will be used for stabilisation until grass is established.
d) For this depth, the resulting shear stress is theh:
Shear Stress , T = yds, lb/ftz
y = Unit weight of water, 62.4 Ib/ft3
d=flow depth, ft
s = Channel gradieht, ft/ft
y = 62.40:: Ib/ft3
d = 0.32 ft
= 0.054:: ft/ft
T = 1.1 Iblft2
This shear tress is under he permissible unit shear stress (2 Ib(ftz}for synthetic mat (erosion control matting) as stated in the: NC
Erosion & Sediment Control Planning and Design Manual, Table 8.05g.
VL Flow Splitter (Forebay) Specifications
Using the orifice equation, Q = Cd*A*(2*g*h}~,iz>
a) Pipe Gross-sectional Area , Ap1pe ° [~ri4]dz, ftz
d = Diameter of pipe from forebay to flow splitter, in
.:Page 4 DA 2

d = 4 inches
Apipe = .0.0872 ftz
b) Nead Above Bypass Pipe , h = [(Q!(Cd*A})2]/2*g; ft
(solving for head above pipe that. wilt be equal to the elevat+on of fhe bypass channel invert above the pipe to the level spreader)
Q = Discharge, cfs (1 in/hr discharge}
Cd = Discharge coefficient [0.6 for harp-edged. orifice]
AP;Pe = Pipe cross-sectional area, ft2
g = Gravitatiohal acceleration, ft/s2
h =height of water above: the orifice {head}, ft
Q = -0:49 cfs
Cd = 0.6
Apipe = 0.0872 ft`
g = 32.2 ft/s2
h= ::1.38 ft
1fll. Swale: Drainage.Calculations
The following. calculations use Darcy's law to ca0culate the time (in hours) that it will take for the swage
upslope: of fhe eve! spreader to naturally drain based on he permeability of the in-situ: soils.:: :
a} Surface Area Draining to In-Situ Soil, A = L*W, ftz
L =Level spreader length, ft
W = Width of swage upslope of level spreader,. ft
L = : 32.04 ft
W= _3 ft
A = _ 96.12 ft
b} GroundwaterFlow, Q = (K*i*A)/43200, cfs Darcys Law
K = Average coefficient of permeabil[ty, in/hr [1.3 inlhr based on Pacolet Loam soils from Sao 25 inches in depth]
based on the Johnston County Soil Survey. (NRCS)
i = Hydraulic gradient [assumed to egi,iai 1]
A =:Surface area draining to in-situ soil, ftz
K = 1.3 in/hr
i= 1
A = : 96.12 ft2
Q = - 0.0029 cfs
c) Votume Draining to In-Situ Soil , V = d*A; ftz
d =.Depth of water draining to in-situ soil, in
A =Surface area draining to in-situ soil, ft
d = 6 in
A = 96.12 ft2
V = ...48.06. _ ft3
d) Time to.Drain the Swale = V/Q, sec
V =Volume drained, ft~
Q = Groundwater flow; cfs
V = 48.06 ft3
Q = ..0.0029 cfs
Td= :.16615
Td = .:::4:62 hr
Check: Since the water held in the swage after the level spreader has been activated will naturally drain in less than 2~1
hours, no underdrain will be necessary.
Page 5 DA 2

Level Spreader Design Spreadsheet
DA 3
Taft Woads
S&EG Pra]eat No. 9197.D1
I. Determine Contributing Impervious Area and tin/hour Discharge Rate
1. Weighted Rational Coefficient, G = F[G;*°J°A;]
C =Rational coe~cient far developmenf area
A =Area
Total Drainage Area = 13.78 acres
Ctevelopment Area (ft2} Area (ac.} l Area Rational G % Area " C SCS Curve % Area * Curve
Lots -Impervious (roof, parking, etc.} 74992.63 1.722 12.5°l° 0.95 0.119 98 12.240
Lots -Forested 9400.00 0,216 1.6% 0.15 0.002 55 0.861
Lots -Lawn {maintained grass} 407666.91 9.359 67.9% 0.2 0.136 69 46.848
impervious (Roads} 47660.51 1.094 7.9% 0.95 0.075 98 7.779
Road Easements (maintained grass} 60717.81 1.394 10.1 °/® 0.2 0.020 69 6.977
total: 600437.86 13.784 0.352 74.705
weighted rational coefficient, G = 0.352
impervious drainage area = 122653.14 ft`
total drainage area = 600437.86 ft2
2. t~ischarge Rafe , Q = G*i*A, cfs
Rational Equation, Applied Hydrolagy by Ghow, pp. 497
G =Weighted rational coefficient
i =Rainfall intensity
A = Dfainage area, ft2
G = 0.352
i = 1.00 inlhaur
A = 13.78 acres
Q = 4.86 cfs
III, Determine LPVeI. Spreader L ength ~ Slope Ghpck
Check: LEVEL SPREADER LE~lGTH HAS EXCEEDED t~A?€Ii~UNT ALLOWABLE LPJGTH, 136 FEET. SEE SEGTIO~t VI.
s =Slope of ground downslope of level spreader = [Elev.„s-Elev.als]1L, ftlft
E[ev.c~js =Elevation at level spreader, ft
EIev.D~s =Elevation at stream bank {or at the edge of a 50' vegetated buffer or filter strip}, ft
L =Length from level spreader fa stream (or edge of 50' buffer or filter strip}, ft
Elev.u~s = 183 ft
Elev.a~s = 180 ft
L = 65 ft
s = 0.0462 ft/
Gheok: Slope is less than 6°1°.
Page 1 DA 3

IV. Hydrology Data
1. rr'me of Concentration , TC = 0.0078"L° 77S-o.335 min
Kirpioh Equatfon, Applied Nydrology by Chow, pp. 500
L =Flaw length from headwater to cutlet {ft)
H = Elevatian difference from headwater to outlet {ft}
S =Average slope = HJL (fklft)
L= 1381,6
H = 73.0
S = 0.053 ftlft
T~ = 6.34 min
2. 70-Year Storm Intensity, iio based an intensity-Duratian-Frequency (IDF} Table
i~o = 10-year intensity that occurs at the time of concentration, T~
TABLE 1. INPUT
Location: Taft Woods East
Duration: 2 yr 100 yr Souroe
(in) (in)
5 min 0.48 0.81 NOAA Hydro 35
16 min 1.03 1.88 NOAA Hydro 35
60 min 1.83 3.80 NOAA Hydro 35
24 hr 3.70 8.30 USWB TP 40
TABLE 2. DEPTH -DURATION -FREQUENCY TABLE 3. INTENSITY -DURATION -FREQUENCY
Duration 2 yr 10 yr 100 yr 2 yr 10 yr 100 yr
H-1 * (in) (in} (in) Duration (inlhr) (in/hr} (inlhr)
5 min " 0.48 0.60 0.81 5 min 5.80 7.22 9.68
10 min 0.81 1.05 1.44 10 min 4.83 6.28 8.64
15 min * 1.03 1.36 1.88 15 min 4.12 5.42 7.52
30 min 1.42 1.97 2.82 30 min 2.84 3.94 5.64
60 min * 1.83 2.61 3.80 60 min 1.83 2.61 3.80
2 hr 2.04 2.94 4.30 2 hr 1,02 1,47 2.15
3 hr * 2.24 3.26 4.79 3 hr 0.75 1.09 1.60
6 hr 2.77 4.09 6.05 6 hr 0.46 0.68 1.01
12 hr * 3.23 4.82 7.18 12 hr 0,27 0.40 0.60
24 hr 3.7
0 5.56 8.30 24 hr 0.15 0.23 0,35
Frain Eqs. Ill°(I-3}, p, [[
::
lll-(4-5}, •Jtal mYVa t~l Ma1lagCment. °Jol.l II lt~insety "° DFip tl il l T~mG
Urban Nydrology. B.H.Bradford, N.S.Grigg, L.S. Tucker
T~ = 6.34 min
3. 10-Year Discharge Rate , Oiu = C*ii~*A, afs
C =Weighted rational caefficient
i,®=Rainfall intensity associated with 10-year starm, inJhour
A =Drainage area, ft~
C = 0.352
i~fl = 7.22 in/hour
A = 13.78 cares
Oia = 35.09 ofs
11.1iUet Detention Pond Sizing
The 1 inlhr flow for this drainage area (and any resanable subdivisions of it) results in a level spreader that exceeds the maximium
length. To remedy this, a wet detention basin is proposed that will have an orifice sized to autiet the discharge associated with the
maximum level spreader length (130 feet, in this case}. The wet detention basin will have a permanent poal. Above this elevation,
the detention basin has been designed with anaugh starage volume to stare the 1 p-yr event and discharge this valume to the level
spreader at the rate associated with the maximum level spreader length. Based an this design, na bypass channel, flow sp[itter, or
forebay will be needed at this level spreader,
The Simple Method, from section 3.3.1 of the September 2007 BMP Manual, is used to caoulate the volume of runoff from the 10-yr
starm.
Salving far V (valume of runaff in ft3 that must be aontralled for the design storm) the Simple Method is:
V = 3630"Rd*Rv*A
Page 2 DA 3

Where:
Rd =Design storms rainfall - in this case 1.05 in based on table 2 above rounding up #o a duration of 10 min from a Tc of 6.34 min.
A =Watershed area in acres
Rv =Runoff coefficient calculated as:
Rv = 0.05 + 0.9*ia
Where la =the imperious fraction = (the impervious portion of the drainage area) I (the #otal drainage area}
Therefore:
la = 0.20
Rv = 0.23
V = 12,183.05 ft3
This storage is less than the storage provided between the permanent pool elevatian and the emergency spillway elevation
(47,042. ft3) of the proposed wet detention basin as shown in the attached Stage-Storage Calculations, therefore, the
proposed wet detention basin is sufficiently sized to store the volume from the 10-yr event and release it to the level
spreader at 2 cfs (see section VI).
VI.1~let detention Pond Orifice Sizing
The maximum discharge from the wet detention basin to the level spreader is calculated as 2 cfs based on the maximum allawable
level spreader length of 130 feet, in this case. (For farested wi#h little or no ground cover and a 50 font vegetated buffer, 65 feet of
level spreader Is needed per 1 cfs of flow. Based on this, 2 cfs is the discharge associated with the maximum level spreader length
of 130'}. Using this Q and the maximum head from the wet detention basin design, h, the orifice equation can be used to solve for
the area of the arifice in the riser that cutlets to the barrel to the level spreader:

Q =Discharge - in this case it will be set to 2 cfs
G~ =Discharge coefficient = 0.6
A =Area of arifice draining the wet pond, ftZ
g =Acceleration due to gravity, ftlsls
h =Maximum height of water above the orifice (head), ft (in this case h = 2 ft based on design)
Therefore, solving for the area of the orifice:
A = Ql{Gd*{2*g'h)^it2)
A = 0.24 ft
d = 0.55 ft (diameter of circular orifioe}
d = 6.63 in
VII. Wet detention Pand Outlet Barrel Sizing
Outflow Pipe Qiameter, Diu31= 16*[(Q*n)/,fsj(3t8} (ft}
Q =Flow to level spreader, (2 cfs)
n = Manning's roughness ooeffoient
s = internal slope (recommended minumum 0.5%)
O'o = 2,00 cfs
n = 0,012 for HDPE CPP double wall, smooth inkerior
s = 0.50%
Dt~,u = 10,67 inohes
Based on this, the Outlet Barrel will be specified with a 12 inch diameter.
VIII. Swale Drainage Calculations
7'tte following calculations use Daroy s law to calculate the fime (in hours) that if w(1l take far the swale upslope of the lave! spreader
to naturally drain based on fhe permeabltlfy of the to-situ soils.
a} Surfaoe Area Draining tp !n-Situ Soit, A = L*W, ft2
L =Level spreader length, ft
W =Width of Swale upslope of level spreader, ft
L = 130.00 ft
W = 3 ft
A = 390.00 ft
Page 3 DA 3

Check: Since the water held in the swale after the level spreader has been aotivated will naturally drain in less than 24
hours, no underdrain will be necessary.
I~. Spillway Channel Design Hydrology
The emergency spillway is sized to convey fhe 100-year event. We are assuming that no storage will be provided by the pond for
the 100-year event, and therefore, this flow has not been routed through the pond.
a) 100-Year Storm lnfensity, 110q based on Intensity-Duration-Frequency {IDF} Table from Seotion IV.2
isoo = 100-year intensity that occurs at the time of concentration, T~
T~ = 6.34 min
i'®o = 9.68 inlhour
Qsoo = 47,04 cfs
. Calculated Depth of Flow using'i~ormal•Depth Prooedure
a) s =Channel slope = [Elev.urs-Elev.nfs]/L, ft/ft
Elev.uds =Upstream reference elevation,
EIev.Qrs =Upstream reference elevation, ft
L =Length of channel from upstream to dawstream, ft
EIev.Urs = 191 ft
Elev.~rs = 185 ft
L = 57 ft
s = 0.1053 ftlft
Page 4 DA 3

b} A =Trapezoidal ohanne[ area = W*d + Md~, ftz
P =Wetted perimeter = W + 2d, fit
R =Hydraulic radius = A1P, ft
W =Bottom width of ohanne], ft
d =Channel depth,
M =Side slaps ratio (H:V}
Rearranged Manning's Equafion: AR~r~ = C1nI[1.49*,~]
C2~oo =Design flow over spillway, cfs
n =Manning°s roughness ooeffioient
s =Channel slope
~~oo = 47.04 cfs M =
n = 0.033 fe riprap-lined ohanne]
s = 0.1653 fttrt
`"need to iu.d u so that Aht = t;tni~1.49*vfl
d W A P R AR2l3
1 24 23.00 22 1.045 23.692
0.5 20 10.75 21 0.512 6.879
0.4 20 8.48 20.8 0.408 4.662
0.35 20 7.37 20.7 0.356 3.700
0.34 20 7.15 20.68 0.346 3.520
0.33 20 6.93 20.66 0.335 3.343
0.335 20 7.04 20.67 0.340 3.431
0.,'+25 20 6.82 20.65 0.330 3.25E
+..~ :~:%?a ~ 20 6.76 20.6448 0.327 3.21 t
Based an this caloulated depth, the emergenoy spillway will pass the
100 year event without overtopping sinoe its design depth is 1.0 feet
3f1. Shear Stress Calculations
b} Channel shear stress, Tcei. = YHA®*d*5~~,,, Iblft~
YHZa =Unit weight of water, Iblft3
d =Channel depth, ft
Soh. = Channel slope, ftlft
YHZO = 62.4 Ib/ft'
d = 0.322 ft
Scn. = 0.1053 ftlft
TCn. = 2.118 Iblftz
3 H:1 V
... , , .... , , s s , , . _ .. , .. , ,
rlCtUal Char~eiC.e {g SlnenJ~on$.
W = 24 ___ ft_
.a -
1.000 ft ........
Acoording to Table 8.058 of the NCDENR Erosion and Sediment Control Manual, this is a
permissable shear stress for a riprap liner with a d~~ of 9 inohes ar greater.
This oorresponds with Class 1 Rip Rap as defined in `Cable 1042-1 of the NCDCT Standard
Speoifiactions for Roads and Struotures, 2002.
Paga 5 DA 3

~~~GE-S~T®RAC~E REL~lTIQt~SHI~ STA-STO.WB2 J.L.E. VER. OS-97, P.K.S.: MOD. 09-02, P.K.S. MOD. 08-06
Taft Woods Drainag e Area #3
S&EC Project No. 9197D1 Wet Detention Basin:
STORAGE ABOVE PERMENANT POOL
S UlUftiAt"I RY EQUH TIO~d:
Regression Output: Ks
S = Ks Zb Constant 10.007 22185
where: S =Storage Volume, ft.3
Z =Stage above Invert, ft. X Coefficients} 1.084 1.08
Ks is defined by regression output
b is defined by regression output
Incremental Storage Computed Computed
Contour .Area Z AREA dH Volume (Acc. Vol.), S In(Z} 1n(S) Storage In(S)
(E{ev.j (Acres} (feet) (ft2) (ft.) (ft3) (ft3) (ft3)
189.0 0.47 _ 0 0 20433
190.0 0,55 1.0 23938 1 22185 22185 0.000 10.007 22,185 10A07
191:.0: :0:.59 2.0 25774 1 24856 47041 0.693 10.759 47,041. 10.759
.Page 6 DA 3

Level Spreader Design Spreadsheet
DA #4
Taft Woods
S&EG Project IVo. 9197.D1
I. Determine Contributing impervious Area and 1inlhour Discharge: Rate
1. Weighted Rational Coefficient. C = E[G;*%A;]
C =Rational coefficient for development area
A =Area
:::.Total Drainage Area = 1.11 acres: :
Development Area (ff2) Area (ac.) % Area Rational C % Area ' C
:Lots -Impervious (roof, parking,: etc.) 3242:99 0.074 6.7%° 0.95 0.064
Lots -Forested:: 4050:00 0.024 2.2%° 0.15 0.003: :
Lots -Lawn (maintained grass) 22536.38 0.517 46.5% 0.2 0.093
::Impervious (Roads) 9897.12 .:0:.227 20.4% 0.95 0.194::
Road Easemehts (maintaihed grass} 11687.00 0.268 24.1% 0.2 0.048
total::: :484:1:3.49 1.111 0.402: :
weighted rational coefficient, C _ D.402

impervious drainage area = 13140.11 ft2
total drainage area = 48413.49 ft~

2. Discharge Rate:, Q = G'`A, cfs
Rational Equation, Applied Hydrology by Chow, pp. 497
C =.Weighted rational coefficient
i =Rainfall intensity
A =Drainage area, fk2
G= ...0.402.::::
i = 1.00 in/hour
_A= :::1.11 :::acres
Q = 0.45 cfs
II. Sizing the Forebav
Forebay Area , Aforebay - 0.2%\Aimp.), ft2
A;mp. =Contributing impervious. area, ft2
A;mp, = 13140.11 ft2
:. 2 :: ::
At4~eeay = 26.28 ~ :: :: :: :: :: :: :: :: :: :: :: '.
IIt. Determine Level Spreader Length & SBope Check
*~Choose one of the following, a-d
Level Spreader Desian Guidance by DWQ
at Grass or thick ground cover vegetation `--13 feef of level spreader per 1 cfs of flow
b: Forested with little/no ground cover vegetation and 50-foot vegetated b uffer '--65 feet of level spreader per 1 cfs of flow
c: Forested with little/no ground cover vegetation and 100-foot vegetated buffer =--50 feet of level spreader per 1 cfs of flow
d: Forested with little/no ground cover vegetation and 150-foot vegetated buffer '--40 feef of level spreader per 1 cfs of flow
Cover: b (a, b, c, or d from above)
Total discharge, Q = 0.45 cfs

Length of level spreader = 29.08 ft

Check: :Level spreader is vaithin allowable length. requirements of greater than 13 feet and less. than 130 feet.:
.:Page 1 DA 4

s =:Slope of ground downslope of level spreader _ [Elev.uis-Elev.arsl/L, ft/ft
Eiev.u~s = Elevation at level spreader, ft
Elev.p~s = Elevation at stream bank (or at the edge of a 50° vegetated buffer or filter strip), ft
L =.Length from level spreader to stream (or edge of 50' buffer or filter strip),. ft
Elev.urs = 178.38 ft
Elev.o~s = 177.24 ft
L = 55.5g ft
s = _ 0.0204_ ft/ft
Check: Slope is less than 6%.
11+'. Determine. Bypass Channel .Design Fiow (Riprap Lined or Grass Swale).
1. Time of Concentration ; T~ = 0.0078'Lo.ais-o.aes min
Kirpich Equation, Applied Hydrology by Chow, pp. 500
L = Flow length. from. headwater to outlet {ft)
H ^ Elevation difference from headwater to outlet (ft)
S =Average slope = H!L (ft/ft)
L = 698.0 ft
H = 30.0 ft
S = 0.043 ftlft
T~ =::::4.06.::: min
2. 10-Year Stormintensity, i~o based on:Intensity-Duration-Frequency:(IDF)Table
i1Q = 10-year intensity hat occurs at the time of concentration, T~
TABLE 1. INPUT
Location: Taft Woods East.::::
Duration: 2 yr 1:00 yr Source
(in) (in)
5 mirr 0.48:: 0.81 NOAA Hydro 35
15 mine. 1.03 1.88 NOAA Hydro 35
60 min: 1.83:: :: 3.80 NOAA Hydro 35
24 hr 3.70 8.30 USWB TP 40
TABLE 2. DEPTH -DURATION:- FREQUENCY:: TABLE 3. INTENSITY:- DURATION -FREQUENCY
Duration 2 yr 10 yr 100 yr 2 yr 10 yr 100 yr
H-1 * (in) (in) (in) Duration (in/hr) (in/hr) (inlhr)
5 min * 0.48:: :: 0.60 0.81 5 min 5:80 7.22 9.68
10 mine 0.81 :: 1.05 1.44 10 min 4.83 6.28 8.64
15 min * 1:03:: 1.36 :::1.88 15 min 4.12 :::5.42 7.52::
30 min 1.42 1.97 2.82 30 min 2.84 3.94 5.64
60 min:" 1.83:: 2.61 ::3.80 60 min 1.83 :::2.61 3.80::
2 hr 2:04 2.94 4.30 2 hr 1:02 1.47 2.15
3 hr 2.24 3.26 4.79 3 hr 0.75 1 A9 1.60
6 hr 2.77:: 4.09 :::6.05 6 hr 0:46 :::0.68 1.01::
12 hr ' 3.23 4.82 7.18 12 hr 0.27 -0.40 0.60
24 hr 3.70:: 5.56 .::8.30 24 hr 0.15 :::0.23 0.35
Frem Eqs. ll(-(1-3), p.llJ-(4-5}; Stormwater Management: Vol.l Intensity = :Depth /.Time
Urban Hydrology. B.H.Bradford, N.S.Grigg, L.S. Tucker
Tc = ::5.00 : min
3. 10-Year Discharge Rate, Q'o ~ C*i7o*A, cfs
C =Weighted rational coefficieht
i~o = Rainfall intensity associated with 10-year storm, in/hour
A = Drainage area, ft2
C = 0.402
i7o = 7.22 in/hour
A = 1.11 acres
Qio = 3.23 cfs
Page 2 DA 4

V. Bypass Channel Specifications:
1. Calculated Depth of Flow using Norma(-Depth Procedure
s =:Channel. slope = [Elev.urs-Elev.prs]iL, ft/ft
Elev:urs = Elevation at level preader, ft
Elev.prs = Elevation at stream. bank, ft
L =.Length of channeCfrom level spreader to stream, ft
Elev;urs = 178.1 ft
Elev.ors = : 176.7 ft
L = ...54.92 ft
s ° 0.0255 ft/ft
2. Bypass Channel Dimensions (for trapezoidal channel)
a) Cross-sectiohal Area, AX = QioNa, ft2
Qi0 = 10-year design flow, cfs
Va = Chosen to be less than the. maximum allowable channel velocity, 5 fps for the 10-yr event according to the NC Erosion &
Sediment Cohtrol Plahning and Desigh Manual table 8.05a for a Bermudagrass lined chanhel
Q,o = 3.23 cfs
Va = 3.1 :::fps
AX = 1.04 ft2
b) working constant, w~ M _ 2*~1+M2]
M =Side slope ratio (H:V)
M = 3 H:1 V
w~ _ :::_3.32 {will always be Negative)
c) warking constant, w2 = Axf[[(Va~n)!(1.49,~)]3/2]
Ax = Channel cross-sectional area, ft2
Va = Chosen to be less than the maximum allowable velocity
n = Manning's roughness coefficient [0.030 for grass-lined;-0.033 for riprap-lined {Applied Hydrologyby Chow, Table 2.5.1, pp. 35)]
s =Channel slope, ftifk
AX = ::1.04 ~
Va = 3.1 ::fps
n = : 0.030
s = 0:0255 ft/ft
w2 = 4.26
d) Depth of Flow, d = [-w2 + „(w22+4w1AX}]/2w1, ft
w~ ° Working donstaht
w2 =:Working constant::
Ax = Channel cross-sectional area, ft2
wi = -3.32
w2 = .::4.26
Ax = 1.04 :.ft2
d = 0.329 ft
e) Bottom Width of Channel, B = Ax/d - M*d, ft
Ax = Channel cross-sectional area, ft2
d =Depth of flow, ft
M ° Side slope ratio (H:V)
AX = 1.04 ft2
d = 0.329 ft
M = 3 H:1 V
B = 2.19 ft
Page 3 DA 4

f) Top width. of channeh t = B+(2*d*M), ft
B =Bottom width of channel ft
d =Depth of flow, ft ~ t
M =Side slope ratio (H:V) ~,
B= .2.19 ft d
d = 0.329 ft 1
M = 3 H:1V M
__t=__4.16_ ft___ ~-~ g~~
3. Velocity Check:
a) Wetted Perimeter, P = B+2d~Mz+1L ft
B =Bottom width of channel, ft
d =Depth of flow, ft
M =Side slope ratio (H:V)
B = :::2.19 ft
d = 0.329 ft
M = 3 H:1V
P = 4.26 ft
b) Hydraulic Radius, R = A/P
Ax =Channel cross-sectional area, ftz
P =Wetted Perimeter, ft
AX = ::1.04 ftz
P = 4.26 ft
R = 0.244 ft
c) Bypass Channel Velocity, v = (1.49/n)*Rzl3*SVZ :fps
'--velocity must be less than 5 fps according to E&S Control Planning and Design Manual -Grass-Lined Channels
n = Manning's roughness coefficient [0:030 for grass-Tined; 0.033 for riprap-lined (Applied Hydrology by Chow, Table 2.5, 9, pp. 35J ]
R =Hydraulic radius; wetted cross-sectional area (A) I wetted pereimeter (P), ft
s =Channel slope, ftlft
n = 0.030
R = A.244 ft
= 0.025 ftlft
__V= 3.10 :::fps
Check: Velocity is within allowable maximum velocity for Bermudagrass dining. i~.temporary lining of erosion control
matting will be used for stabilisation until grass is established.
::.For this. depth, the resulting shear stress is then:: :
Shear Stress , T = yds, lb/ftz
y =Unit weight of water, 62.4 Ib/ft3
d= Flow depth, ft
s =:Channel gradient, ft/ft
y = 62.40 It)ift3
d = 0.33 ft
s = 0.025 ft/ft
T = 0.5 Iblft2
This. shear stress is under the permissible unit shear stress (2 Ib/ft2} for synthetic mat (erosion control matting) as stated in the NC
Erosion & Sediment Control Planning and Design Manual, Table 8.05g.
VI. Flow Splitter (Forebay) Specifications
Using the arifice equation, Q _ Gtl*A*(2~g*h)1'~zl
a) Pipe Cross-sectional Area , AP;Pe = [~rf4]d2, ftz
d =Diameter of pipe from forebay to flow splitter, in
d = 4 inches
Apipe = ®.©872 ftz
Page 4 DA 4

b) Head AboveBypass Pipe, h = [(Q/(Cd*A))2]/2*g; ft
(solving for head above pipe that. wiH be equal to fhe elevation of the bypass channel invert above the pipe to the level spreader)
Q = Discharge, cfs (1 in/hr discharge) :: :
Cd = Discharge coefficient [0.6 for sharp-edged. orifice]
AR,Re = Pipe cross-sectional area, ft2
g = Gravitational acceleration, ft/s2
h =:Height of water above the orifice (head), ft
Q = -0.45 cfs
Cd = 0.6
A - 0.0872 ft`
:.pipe -
g = 32.2 ft/s2
h= :::1.13 ft
`JII. Swale: Drainage Calculations: :
The following. calculations use Darcy's law to calculate fhe time (in hours) that it will take for the swale
upslope of the7evel spreader to naturally drain based on he permeability: of the in-situ soils.: :
a) Surface Area Draining to Pn-Situ Soil, A = L*W, ft2
L =Level spreader length, ft
W = Width ofswale upslope of level spreader, ft
L = .::29.08 ft
W= 3 ft
A = 87.23 ft2
b) Groundwater Flow, Q = (K*i*A)l43200, cfs Darcy's Law
K = Average coefficient of permeabillty, inihr [4 inihr based on Wehadkee Loam oils from 0 to 7 inches in depth]
based on the Johnston County Soil Survey (NRCS)
i =.Hydraulic gradient [assumed to equal 1]
A = Sun`ace area draining to in-situ soil; ft2
K = 4 in/hr
i= 1
A = 87.23 ....ft2
Q = 0A081 cfs
c) Volume Draining to In-Situ Soif , V = d*A, ftz
d =Depth of water draining to in-situ soil, in
A =Surface area draining to in-situ soil; ft
d = 6 in
A = 87.23 .::ft2
V = 43.61 ft3
d) Time to Drain the Swale = V/Q, sec
V =Volume drained, fta
Q ° Groundwater flow, cfs
V = 43.61 ft3
Q = 0.0081 cfs
Ta = 5400 s
Td = 1.50 hr
Check: Since the water held in the Swale after the level spreader has been: activated will naturally drain In less than 24
.hours, no underdrain will be necessary.
:Page 5 DA 4

Level Spreader Design.Spreadsheet
DA #t3
Taft Woods
S&EC Project No. 9197.D1
I. Determine Contributing Impervious Area and tin/hour Discharge Rate
1. Weighted Rational Coefficient , C = F[C;*°f°A;j
C =Rational coefficient for development area
A = Ar@a
Total Drainage Area = 0.93 acres
Development Area (ff2) Area (ac.) % Area. Rational C % Area * C
:Lots -Impervious (roof, parking, etc.) 1241.80 0.029 3.1 % 0.95 0.029
Lots -Forested 0.00 0.000 0.0% 0.15 0.000
:::Lots -:Lawn {maintained grass) 9419.37 x.216 23.2°/a 02 0.046
Impervious (Roads) 13091,83 -0:301 32.3°l0 0.95 -0:307
Road Easements.(maintained grass} 16769.03 0:385 41.4% 0:2 0.083
total: 40522.04 0.930 0.465
:..weighted rational coefficient, C = 0.465
impervious drainage area = 14333.64 ft2
...total drainage area= .....40522.04 ft2
2. Discharge Rate, Q = C*i"A, cfs
Rational Equafion, Applied Hydrology by Chow; pp. 497
C =Weighted rational coefficient
i =Rainfall intensity
A =Drainage area, ft2
C = 0.465
i = 1:00 in/hour
A = 0.93 acres
Q = 0:43 cfs
IL Sizing the Forebay
Farebay Area , Af°~ebay ° 0.2%(A;mp.}, ft2
A~mP. _:Contributng impervious area, ft2
2
Amp. = 1.4333.64 ft

ftz
p+foietiay = 28.67
IIf. Determine Level Spreader Length & Slope Check
........choose ane of the following, a-d
Level Spreader Design Guidance by DWQ
a: Grass or thick ground cover vegetation '--13 feet of Pavel spreader per 1 cfs of flow
b: Forested with. little/no ground cover vegetation and 50-foot vegetated buffer '--65 feet of level. spreader per 1 cfs of flow
c: Forested with little/ho ground cover vegetatioh and 100-foot vegetated buffer '--50 feet of level spreader per 1 cfs of flow
d: Forested with little/na ground cover vegetation and 150-foot vegetated buffer '--40 feet of level spreader per 1 cfs of flaw
cover: b (a, b, c, oral from above)
Total discharge, Q = 0.43 cfs
Length of level spreader = 28.13 ft
Check: Level spreader is within allowable length requirements of greater than 13 feet and less than 130 feet.
Page 1 DA 5

s = Slopeof ground: ddwnsldpe of level spreader = [Elev.urs-Elev.prsllL, ft/ft
Elev.urs =flevatiorrat level spreader; ft
Elev.prs =Elevation at stream bank {or at the edge of a 50' vegetated buffer or filter strip),: ft
L =Length from level spreader to stream (or edge of 50' buffer or filter strip), ft
Elev.ws = 189.22 ft
Elev.prs =:::185.91:. ft
L = 76.91 ft
s = 0.0430 ft/ft
Check: Slope is less than 6%.
IU. Determine Bypass Channel Design Flow (Riprap Lined or Grass Swale)
1. Time of Concentration, T~ =.0.0078*L037s,-0.385: min
Kirpch Equation, Applied Hydrology by Chow, pp. 506
L =Flow lehgth from headwater to outlet (ft)
H =Elevation difference from. headwater to outlet (ft)
S =Average slope _ H/L (ftlft)
L = _ 637:9 ft
H = 38.0 ft
S = :::0.060:: ft/ft
T~ _ 3.34... min
2. 10-.Year Storm Intensity, i~o based on Ihtensity-Duration-Frequehcy (IDF) Table
i~o = 10-year jntensity hat occurs at the time of concentration, TG
TABLE 1. INPUT
Location: Taft Woods East:: :
Duration: 2 yr 100 yr Source
(in) (in)
5 min 0.48 .:0.81 NOAA:Hydro 35
15 min 1.03 1.88 NOAA Hydro 35
60 min 1.83 .:3.80 NOAA:Hydro 35
24 hr 3.70 8.30 USWB TP 40
TABLE 2. DEPTH -DURATION -FREQUENCY TABLE 3. INTENSITY - DURATION -FREQUENCY
Duration 2 yr 10 yr 100 yr 2 yr 10 yr 100 yr
H-1 * (in) (in) (in) Duration (inlhr) (inlhr) (inlhr)
5 min * 0.4$ 0.60 0.81 ::: 5 min 5.80 7.22 9.68
10 min 0.81 1A5 1.44::: 10 min 4.83 6.28:: 8:.64
15 min ~ 1.03 1.36 1:88::: 15 min 4.12 5.42 7.52
30 min 1:42 1.97 2.82 30 min 2.84 3.94:: .5,64
60 min * 1.83 ::2.61 3.80::: 60 min 1.83 2.61 :: 3:.80
2 hr * 2.04 2.94 4.30 2 hr 1.02 1.47 2.15
3 hr * 2.24 ::3.26 4.79::: 3 hr 0.75 1.Q9 1.60
6 hr 2:77 4.09 6:05 6 hr 0.46 0.68 1.Q1
12 hr * 3.23 4.82 7.18 12 hr 0.27 0.40 0,60
24 hr ' 3.70 .:5.56 8.30::: 24 hr 0.15 0.23:: 0:.35
From Eqs. lll-(1-3), p.lll-(4-5), Stormwater Managemeht: Vol.l Ihtensity= Depth !Time
Urban Hydrology. B.H.Bradford; N.S.Grigg, L.S. Tucker
T~ _ 5.00 min
3. 1D-:Year Discharge Rate , Ora = C*i~~*A, cfs
C =Weighted rational coefficient
i~®_ Rainfall intensity associated with 10-year: storm; in/haur
A =Drainage area, ft2
C = 0.465
i,~ = 7.22 inJhour
A = 0.93 acres. :
Qua ° 3.13::: cfs ::: :
.:Page 2 DA 5

V. Bypass Channel Specifications::
1, Calculated Depth of Flow using Norma!-Depth Procedure
s =.Channel. slope = (E1ev.urs-Elev.ws]/L, ft/ft
Elev.urs = Elevation at level spreader, ft
Elev.ors = Elevation at stream bahk, ft
L = Length of channel from level spreader to stream, ft
Elev.urs = : 1:90.4 ft
Elev.ors = 185.77 ft
L = 123.16 ft
s =_ _ 0.0376 _ ft/ft
2. Bypass Channel Dimensions (for trapezoidal channel)
a) Cross-sectional Area, Ax = Q~QNa; ft2
Quo = 10-year design. flow, cfs
Va =:Chosen to be less: than the maximum allowable channel velocity, 5 fps for the 10-yr event according tothe NC Erosion &
:::Sediment Control Planning and Design Manual table 8.05a fora Bermudagrass lined: channel: :
a1o = :3:.13 .cfs
Va = 3.5 fps
A;~ _ :0.89 ft2
b) Working Constant, w, = M - 2".II9+M~l
M = Side slope ratio (H:V)
M = 3 H:1V
wa = -3:.32 (will. always be negative)
c) Working Constant, w2 = AX/CCNa~n)f(1.49,~)larz]
Ax = Channel cross-sectional area, ft2
Va = Chosen to be less than the maximum allowable velocity
n = Manning's roughness coefficient [0.030 for grass-lined; 0.033 for riprap-lined (Applied Hydrologyby Chow, Ta61e 2:5.9, pp. 35)]
s = Channel slope, ft/ft
Ax = .0,89 ftz
Va = 3.5 .:fps
n = 0.030
s = -0.0376 ft/ft
w2 = ::4.08
d) Depth of Flow, d = [-w2 ±,rtwz +4w~AX)]/2w~, ft
w~ = Working constant
w2 = Working constant
Ax = Channel cross-sectional area, ft2
W, _ _3.32
w2 = .4;08
AX = -0:89 ::ft2
d = 0.286 ft
e) Bottom Width of Channel, B = Ax/d - M`d, ft
AX = Channel cross-sectional area, ft2
d =.Depth of flow, ft
M = Side slope ratio (H:V)
AX = -0.89 : ft2
d = 0.286 ft
M = 3 H:1 V
B = 2.27 ft
Page 3 DAIS:

f) Top Width of Channel, t ° B+(2'd*M), ft
B =Bottom width of channel:, ft
d =Depth of flow, ft ~ t ~
M =Side slope ratio (H:V)
B = 2.27 ft d
d = 0.286 ft 1
M= 3H:1V __, M
t = 3.98::: ft B
3. Velocity Check
a) Wetted Perimeter, P = B+2d,j(M~+1], ft
B = Bottom widthof channeh ft
d ° Depth of flow, ft
M =Side slope ratio (H:V)
B = 2.27 ft
d = 0.286 ft
M= __3H:1V
P = 4.08 ft
b) Hydraulic Radius, R _ A/P
AX = Channel cross-sectional area, ftZ
P = Wetted Perimeter, ft
AX = 0.89 ft2
P = 4.08 ft
R= 0.219_ ft__
c) Bypass Channel Velocity, v ~ (1.49/n)*Rus*Sv4 fps
'--velocity must be less than 5 fps according to E&S Contral Planning and Design Manual -:Grass-kined Channels
n = Manning's roughness coefficient 10.030 fog grass-lined; OA33 for riprap-lined (Rpplied Hydrology by Chow, Table 2.5.9, pp. 35) ]
R =Hydraulic radius, wetted. cross-sectional area (A) /.wetted pereimeter (P), ft
s = Channel slopes ft/ft
n = 0.030: :
R = 0.219 ft
s = 0.038 ft/ft
V = 3.50 fps
Check: Velocity is within allowable maximum velocity for Bermudagrass lining. A emporary fining of erosion control
matting will be used for tabilization until grass is established.
For this depth, the resulting shear stress is then::
Shear Sfress, T = yds, Iblft2
y =Unit weight of water, 62.4 Ib/ft3
d= Flow depth, ft
s ° Channel gradient, ft/ft
y = 62.40:: I b/ft3
d = 0.29::: ft
s = 0.038:: ftlft
T = 0.7 Iblft
This shear stress is under the permissible unit shear stress (2 Ib/ftZ) for synthetic mat (erosion control matting) as stated in the NC
Erosion & Sediment Control Planning and Design Manual, Table 8.058.
VI. Flow Splatter (Forebay) Specifications
Using the orifice equatian, Q _ C~*A*(2.g*h)iv2)
a) Pipe Cross-sectional Area , Ap€pe = I~f4]dZ, ft2
d = Diameter of pipefirom foi-ebay to flow splitter•, in
d = 4 inches
z
Apipe =.::0.0872:: ft
Page 4 DA 5

b) Head Above Bypass Pipe, h = [(Q/(Cd*A))2]/2*g, ft
(solving for head above pipe that will be er~ual to fhe elevation of the bypass channel invert above the pipe to the level spreader)
Q =Discharge, cfs (1 in/hr discharge)
Cd =Discharge coefficient [0.6fior harp-edged orifice]
AP;pe =Pipe cross-sectional area,: ft2
g = Gravitatiohal acceleration, ft/sZ
h =:Height of water above the orifice (head), ft
Q = .:0.43 cfs
Cd = 0.6
Ap;Pe = ..0.0872 ft~
g = 32.2 ft/s2
h= 1.06 ft
YII. Sv~ale Drainage Calculations
The following calculations use Darcy's law to calculati= the time (ih hours) that it will take for the swale
upslope of the level spreader to naturally drain based on he permeabilityof the irr-situaoils.:: :
a) Surface Area Draining to In-Situ Soil , A = L*W, ft2
L =Level spreader length, ft
W =Width of wale upslope of Bevel spreader, ft
L= :28.13 ft
W= 3 ft
A = 84.40 ::ft2
b) Groundwater Flow, Q = {K*i*A)/43200, cfs Darcy's Law
K = Average coefficient of permeabllity, inlhr [4 in/hr based on Pacolet Loam coils from 0 to 8 inches in depth]
based on the Johnston County Soil Survey (NRCS)
i =Hydraulic gradient [assumed o equal 1]
A = Surtace area draining to in-situ soil,: ft2:
K = 4 in/hr
i= 1
A = 84.40 ::ft2
Q = D.0078 cfs
c) Volume Draining to In-Situ Soil , V = d*A, ft2
d=Depth of water draining #o in-situ soil, ih
A =Surface area draining to in-siku soil,: ft
d = 6 in
A = :84.40 ::ft2
V = 42.2D ft3
d) Time to Drain the Swale. = V/Q, sec
V =:Volume drained, ft3
Q =Groundwater flow, cfs
V = .42.20 ft3
Q = _ 0.0078 _ cfs
Ta = 5400 s
Ta = ::1.50 hr
Check: Since the water held in the Swale after the level spreader has been activated will naturally drain in less than 24
.hours, no underdrain will be necessary.
Page 5 DA 5

Leuel Spreader Design Spreadsheet
DA #6
:Taft Woods
8&EC Project No. 9197.D1
I. Determine Contributing Impervious Area and 1 inlhour Discharge Rate :: :
1. Weighted Rational Coefficient; C = F[C;~%A;]
C =Rational coefficienffor development area
A =Area
Total Drainage Area = 1.62 acres :
Development Area {ff 2) Area (ac.) % Area Rational C % Area ` C
:Lots.- Impervious (roof; parking; etc:) 1128:87 0.026 1.6%° 0:95 0.015
Lots -Forested.: 0.00 0.000 0.0% 0.15 0.000
Lots -Lawn (maintained grass) 7995:63 0.184 11.3% 0,2 0.023
::Impervious (Roads) 25334.48 .:0:.582 35.9% 0.95 0.341::
Road Easements (maihtaihed grass) 36199.08 0.831 51.2% 0.2 0.102
otal: 70658.06 1.622 0:.481: :
weighted rational coefficient, C = 0:481

impervious drainage area = 26463.35 ftz
total draihage area = 70658.06 ft~

2. Discharge Rate , Q = C*i*A, cfs
Rafiona/Equation, Applied Hydrology by Chow, pp. 497
C =Weighted ratianal coefficient
i =Rainfall intensity
A = Drainage area, ftz
C = ...0.481.::: :
i = 1.00 in/hour
A = :::1.62 :::acres
Q = 0.78 dfs
II. Sizing the Forebay
Forebay Area , Aforebay ° 0.2%(A;mp.), ft2
A,mp. =:Contributing :impervious area, ftz
A;mp. = 26463.35 ft2

ft2
Atoretiey = .:52,93.
III. Determine Level Spreader Length.& Slope Check
*'Choose one of the following, a-d
Level Spreader Desian Guidance by DWQ
a: Grass or thick grouhd cover vegetatioh °--93 feet of level spreader per 1 cfs of flow
b: Forested. with little/no ground cover vegetation and 50-foot vegetated buffer '--65 feet. of level spreader per 7 cfs of flow : :
c: Forested with little/ho ground cover vegetation and 400-foot vegetated buffer '--50 feef of level spreader per 7 cfs of flow
d: Forested. with little/no ground .cover vegetation and 150-foot vegetated buffer '--40 feef. of level spreader per.7 cfs of flow
Cover: b (a, b, c, or d from above)
Total discharge, Q = 0.78 cfs

Length of level spreader = 50.70 ft

.Check: Level preader is within allowable length. requirements. of greater than 13 feet and less than 130 feet.
Page 1 DA 6

s = Slope of ground downslope of level spreader _ [Elev.urs-Elev.arsllL, ft/ft
Elevrurs = Elevation at level spreader, ft
Elev.ors = Elevation at stream bank (or at the edge of a 50° vegetated buffer or filter strip), ft
L =.Length from 9evel spreader to stream (or edge of 50' :buffer or filter strip),. ft
Elevurs = ::193.53 ft
Elev:ors = 186.96 ft
L = 111.49 ft
s = 0.0589 ft/ft
Check: Slope is less than 6%.
IV. Determine: Bypass Channel Design Flow (Riprap Lined or Grass Swale):
1. Time of Concentration ; T~ = 0.0078*Lo.ns-o.3as min
KirpJch Equation, Applied Hydrology by Chow, pp. 500
L = Flow length. from. headwater to outlet (ft)
H ` Elevatoh difference from headwater to outlet (ft)
S =Average slope = H/L (ft/ft)
L = 1197.4 ft
H = 67A ft
S = A.056 ft/ft
TO = 5,55 min
2. 70-Year Storm Intensity; i10 based onintensity-Duration-Frequency. (IDF) Table
i,® = 10-year intensity hatoccurs at he time of concentration, TC
TABLE 1. INPUT
Location: Taft Woods East.::::
Duration: 2 yr 100 yr Source
(in) (ih)
5 min 0.48:: 0.8:1 NOAA Hydro 35
15 mine. 1.03 1,88 NOAA Hydro 35
60 mine 1.83 3.80 NOAA Hydro 35
24 hr 370 8.30 USWB TP 40
TABLE 2. DEPTH -DURATION:- FREQUENCY TABLE 3. INTENSITY:- DURATION :- FREQUENCY
Duration 2 yr 10 yr 100 yr 2 yr 10 yr 100 yr
H-1 " (in) (in} {in} Duration (in/hr) (in/hr) (in/hr)
5 min* 0.48.. ...0.60 ....0.81.:::: 5 min 5.80 . ....7.22:::: .9.68::
10 mih 0.81 1A5 9.44 10 min 4.83 6.28 8.64
15 min * 1.03:: :1:.36 .::1.88 15 min 4.12 :::5.42 7.52::
30 min T.42 4.97 2.82 30 min 2.84 3.94 5.64::
60 min.` 1.83:: 2.6:1 :::3.80 60 min 1.83 :::2.61 3.80::
2 hr ~ 2.04 2.94 4.30 2 hr 1.02 1.47 2.15::
3 h~ 2.24 3.26 4.79 3 hi• 0.75 1.09 1.60
6 hr 2.77:: 4.09 :::6.05 6 hr 0.46 :::0.68 1.01::
12 hr * 3.23 4.82 7.18 12 hr 0.27 0.40 0.60: :
24 hr ° 3J0 5.56 :::8.30 24 hr 0.15 :::0.23 0.35: :
From Eqs. II(-(1-3), pall-(4-5), Stormwater Management:. Vol.l Intensity = Depth 1 Time
Urban Hydrology. B.H.Bradford, N.S.Gri99, L.S. Tucker
T~ _ :: 5.55 min
3. 10-YearQischarge Rate, Q,o = C`i,o'A, cfs
C =Weighted rational caefficient
i~o _ Rainfall intensity associated with 10-year storm, inlhour
A =Drainage area, ft2
C = 0.481
iao = 7.22 in/hour
A = 1.62 acres
Quo = 5.63 cfs
Page 2 l7A 6

V. Bypass Channel: Specifications:
1, Calculated Depth of Flow using Nomaal-Depth Procedure
s =Channel lope = [Elev.urs-Elev.orsl/L, ft/ft
Elev:urs = Elevation at level spreader, ft
Elev.ors = Elevation at stream bank, ft
L =Length of channel from level spreader to stream, ft
Elev.urs = ::193.5 ft
Elev.ors = .::188 ft
L = 94 ft
s = -0.0585 ft/ft
2. Bypass Channe! Dimensions (for trapezoidal channel)
a) Cross-sectional. Area, AX = G2toNa, ft2
Quo = 10-Year design flovv, cfs
Va =:Chosen to be less: than the maximum allowable channel velocity, 5 fps for the 10-yr event according to he NC Erosion &
Sediment Control Planning and tibesign.Manual table 8.05a for a Bermudagrass lined channel
Qia = 5.63 cfs
Va = 4.8 ::fps
Ax = -1.17 :.ft2
b) Working Constant, w' = M - 2*vi1+MZl
M =Side slope ratio (HtV)
M = 3 H:1V
w~ _ -3.32 (will always be Negative)
c) Working Constant, ~y2 a AXi%[(Va~n)/(1.49013121
AX = Channel cross-sectional area, ft2
Va = Chosen to be less than the maximum allowable velocity
n = Manning's roughness coefficient [0.030 for grass-fined; 0.033 #or riprap-lined (Applied Hydrology by Chow,: Table 2.5,1, pp. 35)1
s ~ Channel slope, ft/ft
AX= 1.17 ::ft2
Va = 4.8 fps
h = 0.030
s = 0:0585 ft/ft
w2 = .::4.65
d) Depth of Plow, d = [-vv2 + ~w2z+4w~AX)1/2vv~, ft
w7 = Working constant::
w2 =: Working constant: :
Ax = Ghannet cross-sectional area, ft2
w, _ -3.32
w2 = .::4.65
AX= 1.17 ft2
d = 0.331. ft
e) Bottom Width of Channeh B = AX/d - M"d, ft
AX = Channel cross-sectional area, ft2
d = Depth of flow, ft
M ° Side slope ratio (H:V)
AX= .:1.17 ft2
d = ....0.331 ft
M = 3 H:1 V
B = 2.56 ft
.Page 3 DA 6

f) Top Width of Channef, = B+(2*d*M), ft
B =Bottom width of channel, ft
d=Depthofflow,ft _______t_______
M =Side slope ratio (H:V)
B = 2.56 ft d ~ 1
d = 0.331 ft
M= 3 H:1V M
t = 4.54 ft B ~
3. Velocity Check:
a) Wetted Perimeter, P = B+2di[Mz+1I. ft
B =:Bottom width of channel, ft
d =.Depth of flow, ft
M =Side slope ratio (H:V)
B = 2.56 ft
d = 0.331 ft
M = 3 H:1V
__P= 4.65 ft
b) Hydraulic Radius, R = A/P
Ax = Channel cross-sectional area, ftz
P = Wetted Perimeter, ft
Ax= ::3.17 ftz
P = .::4.65 ft
R = 0.253 ft
c) Bypass Channel Velocity, v = (1.49/n)*Rzta*Svz fps
'--veldcity must be less than 5 fps according to E&S Control Planhing and Design Manual - Grass-Lined Channels
n = Manning's roughness coefficient [0.030 for grass-Tined; 0.033 for riprap-lined (Applied Hydrology by Chow,: Table 2:5.1, pp: 35) ]
R =Hydraulic :radius; wetted cross-sectional area (A) /wetted pereimeter (P), ft
s ° Channel slope, ft/ft
n = .:.0.030
R = 0.253 ft
_ _ 0.059 ft!ft
V = 4.80 .::fps
Check; Velocity Is within allowable maximum velocity for Bermudagrass Ilning. A temporary lining of erosion control
matting will be used for stabilization until grass is established.
For this depth, the resulting shear stress is then;
Shear Stress , T = Yds; lb/ftz
y =Unit weight of water 62.4 Ib/ft3
d= Flow depth, ft
s =Channel gradient, ft/ft
y ° 62.40 Ib/ft3
d = 0.33 ft
s = 0.059 ft/ft
T = _ _ 1.2 Ib/ft2
This. shear stress is under the permissible unit shear stress (2 Ib/ft2) for synthetic mat (erosion control matting} as stated in the NC
Erosion & Sediment Control Planning and Design Manual, Table 8.058.
VI. Flow Splitter (Forebay) Specifications
Using the orifice equation, Q = Gtl«A,(2,g*h)c~rz~
a) Pipe Cross°sectionalArea, AP;Pe = [~/4]d2, ftz
d = Diameter of pipe. from forebay to flow glitter, in
d = 4 :::inches:::
A 0.0872 ft2
P~Pe
:Page 4 DA 6

b) Head Above Bypass Pipe , h = {(Q!(Cd*A))2]/2*g, ft
(solving forhead above pipe that will be equal to the elevation of the bypass channel inver# above the pipe to the level spreader):
Q ° Discharge, cfs (1 ih/hr discharge)
Cd =Discharge coefficient [0.6 for sharp-edged orifice]
Apipe =Pipe cross-sectidhal area, ftz
g =Gravitational acceleration, ft/s2
h =height of water above the orifice (head), ft
Q = -0.78 cfs
Ca = 0.6
Apipe = .0.0872 ftZ
g = 32.2 ft/s2
h= 3.45 _ _ft
VII. Swale Drainage Calculations
The following calculafions use DarcysJaw to calculate the fime (in.hours) that it will take: for the Swale
upstope of the level spreader to naturally drain based on the permeability. ofthe in-situ soils.:
a) Surface Area Draining to In-Situ Soil , A = L*W, ft2
L =Level spreader length, ft
W =Width df swale upslope df level spreader, fE
L = 50.70 ft
W= 3 ft
A = 152.11 ftZ
b) GrouhdwaterFlow, Q = (K*i*A)/43200, cfs Darcy's Law
K = Average coefficieht of permeablilty, in/hr [4 h/hr based on Pacdlet Loarn soils from 0 td 8 inches ih depth]
based on the Johnston County. Soil Survey (NRCS)
i =.Hydraulic gradient [assumedto equal 1]
A =.Surface area draining to in-situ soil,: ftz
K = 4 in/hr
i= 1
A = 152.11 ftz
Q = 0.0141 cfs
c) Volume Draining to fn-Situ Soil ; V = d*A, ft2
d _ Depth of waterdrai~ing to in-situ soih in
A =Surface area draining to in-situ soil; ft
d= 6 __in
A = 152.11 ft2
V = 76.06 fts
d) Time to Drain the Swale = V/Q, sec
V =Volume drained, ft3
Q =Groundwater flow, cfs
V = 76.06 ft~
Q = •.0:0141 cfs
Td = 5400 s
Ta = 1.50 hr
Check. Since the water held in the sw~ale after thelevel spreader has been activated twill naturally drain in less than 24
hours, no underdrain wiBl be necessary.
.Page 5 DA 6

:Level.Spreader Design Spreadsheet
DA #7
:Taft Woods
S&EC Project No. 9197.D1
I. Determine Contributing Impervious Area and tin/hour Discharge Rate
1, Weighted Rational Coefficient; G = E[C;"%aA;]
G =Rational coefficient for development.area
A =Area
Total Drainage Area = 2.80: acres: :
Development Area (ft2) Area (ac,) % Area Ra tional C % Area * C
:Lots -•tmpervious (roof, parking, etc:) .:8103:61 ::0:.186 6.6°I° 0.95 0:063::
Lots -Forested:: 1285.00 0.029 1.1 °fo 0.15 0.002 :
Lots -Lawn (maintained grass) 47433.05 1.089 38:9°l0 0:2 0.078
.::Impervious (Roads) 23541.84 .:0:.540 19.3% 0.95 0.183. :
Road Easements (maintained grass) 41531.08 0.953 34.1 % 0.2 0.068
total: 121894.6:::2:.798: ::: 0.394: :
weighted rational coefficient, C _ 0.394

impervious drainage area = 31645.45 ft2
total draihage area = 129$94.6 ft2

2. Discharge Rafe , Q = C''A, cfs
Rational Equation, Applied Hydrology by Chow, AP. 497
C =Weighted rational coefficient:
i =Rainfall intensity
A =Drainage area, ft2
C=...:0.394
i = 1.00 in/hour:: :
A = .::2.80 :::acres
Q = 1.10 cfs
[I. Sizing the Forebay
Forebay Area , Aforebay ° 0.2%(Aimp.), ft2
A;mp;=Contributing impervious area, ft2
A;mp. = 31645.45 ft2

z
Aforetiay = 63.29 ft
:III. Determine Level Spreader Length F+'Slope Gheck
**Choose one of the following, a-d
.::.Level Spreader Desian Guidance by DWQ
a: Grass or thick ground cover vegetation "--13 feet of level spreader per 1 cfs of flow: :
b: Forested with little/no ground cover vegetation and 50 foot vegetated buffer '--65 feet of level spreader per 7 cfs of flow
c: Forested with littlelho ground Dover vegetation and 1-00-foot vegetated buffer =-50 feet of level spreader per 7 cfs of flow
d: Forested with little/no ground cover vegetation and 150-foot vegetated buffer '--40 feet of level spreader per 1 cfs of flow: :
Cover: b (a, b, c, or d from above)
Total discharge, Q = 1.10 cfs

Length of level spreader = 71.70 ft

: Check: Levelspreader is within allowabie length requirements. of greater than 13 fee# and ess than 130 feet,
.Page 1 DA7

s =:Slope of ground. downslope of level spreader = [Elev.uis-Elev.oisl/L, f#lft
Elev.u~s = Elevation at level spreader, ft
Eled.p~s = Elevation at stream bank (or at the edge of a 50'.vegetated buffer or filter strip}, ft
L =Length from level spreader to stream (or edge of 50' buffer or filter strip),: ft
Elev.uis = .::182.22
Elev:p~s =.::180.55
L = 82.64
s = 0.0202
Check: .:Slope is less. than 6%.
IV. Determine Bypass Channel Design Flo«r (Riprap Lined or Grass Swale)
1. Time of Concentration , T~ = 0.0078xL0.77s-0.385 min
Kirpch Equation, Applied Nydralogy by Ghow, pp. 500
L = Flow length. from headwater to outlet. (ft)
H = Elevation difference: from headwater to outlet (ft)
S =Average slope = H/L (ft!ft)
L = 969.6 ft
H = 59.0 ft
S = :: 0.061 ft/ft
T~ _ .::4.57 .::min
2. 10-Year Storm Intensity, i,o based on Intensity-Duration-Frequency (IDF) Table
i,o = 10-year intensity that occurs at the time of concen#ration, T~
TABLE 1. INPUT
Location: Taft Woods East.::::
Duration: 2 yr 1.00 yr Source
(ih) {in)
5 mirr 0:48:: : 0.81 NOAA Hydro 35
15 mih 1.03 1.88 NOAA Hydro 35
60 min: 1:83:: :: 3.80 NOAA Hydro 35
24 hr 3.70 8.30 USWB TP 40
TABLE 2. DEPTH -DURATION:- FREQUENCY:: TABLE 3. INTENSITY:- DURATION -FREQUENCY
Duration 2 yr 10 yr 100 yr 2 yr 10 yr 100 yr
H-1 * (in} (in) (in) Duration (in/hr) (in/hr) (in/hr)
5 min' 0:48 0.60 0.81 5 min 5.80 7.22 9.68
10 min: 0.81 1:.05 :::1.44 10 min 4.83 :::6.28 8.64::
15 min * 1:03:: 1:.36 :::1.88 15 min 4.12 5.42 7.52.
30 min 1.42 1.97 2.82 30 min 2.84 3,94 5.64
60 min * 1.83:: : 2.61 .::3.80 60 min 1.83 :::2.61 3.80....
2 hr 2:04 2.94 4.30 2 hr 1.02 1.47 2.15
3 hr 2.24:: : 3.26 :::4.79 3 hr 0,75 :::1.09 1.60::
6 hr 2.77 4A9 ....6.05.:::: 6 hr _ 0.46 . ....0.68.... 1.01
12 hr 3.23 4.82 7.18 12 hr 0.27 -0.40 0.60
24 hr 3.70:: : 5.56 .::8.30 24 hr 0.15 :::0.23 0.35
From Eqs. III-(1-3), p.lll-(4-5), Stormwater Management: Vol.l Intensity = .Depth /.Time
: Urban Hydrology. B.H.Bradford; N.S.Grigg; L.S. Tucker:
T~ _ ::5.00 min
3. 10-Year Discharge Rate, Quo = C*i'o*A, cfs
C -Weighted ratiohal coefficient
iio = Rainfall intensity associated with 10-year: storm, inlhour
A = Drainage area, ft'
C = 0.394
i~o = 7.22 inlhour
A = :::2.80 acres
Q10 =_ _ 7.97_ _ cfs
:Page 2 DA 7

V. Bypass Channel Specifications:
1. Calculated Depth of Flow using Normal-Depth Procedure
s =:Channel. slope ° [Elev.urs-Elev.orsl/L, ft/ft
Elev.urs = Elevation at level preader, ft
Elev:ors = Elevation at stream. bank, ft
L =Length of channel from .level spreader to stream, ft
Elev.urs = 182.5 ft
Elev.ors = .:181 ft
L = 65.02 ft
s = 0:0231 ft/ft
2. Bypass Channel Dimensions (for trapezoidal channel)
a) Cross-sectional Area, AX = Q'oNa, ftz
Quo = 10-Year' desigh flow, cfs
Va = Chosen to be less than the maximum allowable channel velocity, 5fps for the 10-yr event according to the NC Erosion &
Sediment Control Plahning and Design Manual table 8,05a for a Betmudagtass lined chahnel
Q'o = .::7.97 :::cfs
Va = 3.7 ..fps
Ax= 2.15 :.ftz
b) Working Constant, w~ = M - 2",r[1+Mz]
M =Side slope ratio (H:U)
M = 3 H:1V
w~ _ -3.32 (will always be negative)
c) Working Constant, wz ° Ax/[[Na"n)1(1.49,~)]3rz]
AX =:Channel. cross-sectional area, ftz
Ua = Chosen to be less than the maximum allowable velocity
n = Manning's roughness coefficient [0.030 for grass-Tined; 0.033 for riprap-lined (Applied Hydrology by Chow, Table 2.5.1, pp. 35) ]
s = Channel slope, ft/ft
Ax ° ::2.15 ....ftz
Ve = 3.7 .::fps
n = 0.030
s = 0:0231 ft!ft
wz = 6.27
d) Depth of Flow, d = [-wz + ~wzz+4waAX)l/2w~, ft
w~ = Working constaht
wz = Working constant
Ax = Channe( Gross-sectional area, ftz
W~ _ -3.32
wz = .::6.27
Ax° .::2.15 .::ftz
d = 0.452 ft
e) Bottom Width of Channel, B = Ax/d - M*d, ft
AX = Channel cross-sectional area, ftz
d =:Depth of flow, ft
M=Side slope ratio (H:V)
Ax = 2.15 ::ftz
d = 0.452 ft
M = 3 H:1V
B = 3.41 ft
Page 3 DA 7

f) Top Width of Channel, t = B+(2'd"M), ft
B =Bottom width of chahnel, ft
d = Depth of flow, ft
M ° Side slope ratio (H;V) ~ t
B = :3.41 ft
d = 0,452 ft d ~ 1
M = 3 H:1V
t = 6.12 ft M
I~ B
3. Velocity Check:
a) Wetted Perimeter, P = 6+2dv1.Mz+1], ft
B =Bottom width of channel, ft
d =Depth of flow, ft
M =Side slope ratio (H;V)
B = :::3.41 ft
d = 0.452 ft
M = 3 H:1V
P = 6.27 ft
b) Hydraulic Radius, R = A/P
AX =:Channel. cross-sectional area, ft2
P = Wetted Perimeter, ft
AX = 2.15 ....ft2 ,
P = 6.27 ft
R = 0.343 ft
c) Bypass Chahnel Velocity, v = (1.49/n)~Rzis.Suz fps
'--velocity must be ess than 5 fps. according to E&S .Control Planning and Design Manual - Grass-.Lined Channels
n = Manning's roughness coefficient [0.030 for grass-Tined; 0A33 for riprap-lined (Applied Hydrology by Chow, Table 2.5.1, pp. 35J ]
R =Hydraulic radius, wetted cross-sectional area (A) /wetted pereimeter (P), ft
s =Channel slope, ftlft
n = 0.030
R = 0.343 ft
s = 0.023 ft/ft
V = ::::3.70::: :fps
Check: Velocity is within allowable maximum velocity for Bermudagrass liming. A temporary lining of erosion control
matting will be used for tabilization until grass is established.
For his depth; the resulting. shear stress is then:: :
Shear Stress:,: T = Yds, lb/ftz
y =Unit weight of water,. 62.4 Ib/ft3
d= Flow depth, ft
s =:Channel: gradient, ft/ft
y = 62.40 Ib/ft3
d = 0.45 ft
s ° 0.023 ft/ft
7 = 0.7 Ib/ftz
This shear stress is under the permissible unit shear stress (2 Ib/ft2) for synthetic mat (erosion control matting) as stated in the NC
Erosion & Sediment Control Planning and Design Manual, Table 8.05g.
VI. Flow Splltter (Forebay) Specifications. :
Using the orifice equation, Q = Cd~A,.(2*g.h)cvz]
a) Pipe Cross-sectional Area , AP;Pe = hrl4]d2; ftz
d = Diameter of pipe from forebay to flow splitter, in
d = 4 inches
Apipe = :0:0872 ::ft2
Page 4 DA 7

b) Head Above Bypass Pipe , h = {(Q/{cd~a)>2]/2*g ft
(solving for head above pipe that will be equal o the elevation at the bypass channel invert above the pipe to the level spreader):
Q = Discharge, cfs (1 nlhr discharge)
Cd = .Discharge coefficient [0.6 for sharp-edged orifice]
APwe = Pipe cross-sectional area, ft2
g =Gravitational acceleration,: ftls2
h =Height of water above the orifice {head), ft
Q = _ _ 1.10 cfs
Cd = 0.6
Apipe = ®.0872.:
9 = ::32.2 ft/s2
h= 6.90 ft
Vll. Swale Drainage Calculations
The following: calculations use Darcy'slaw to calculate the time. (in hours) that it will take for the swale
upslope of the .level spreader to .naturally drain based on the permeability of the in-situ soils..
a) Surface Area Draining to In-Situ: Soil , A _ L*W, ft2
L =Level spreader length, ft
W =Width of Swale upslope of7evel spreader, ft
L = 71.70 ft
W= _ 3 ft
A = 215.09 ftz
b) GroundwaterFlow, Q = {K*i*A)/43200; cfs
Darcy's Law
K = Average coefficient of permeabiiity, nihr [4 in/hr based on PacolekLoam soils from O to 8 inches in depth]
based on the Johnskon County Soil Survey {NRCS)
i = Hydraulic gradient [assumed to equal 1]
A =Surface area draining to in-situ sail, ft2
K = 4 in/hr
i= 1
A = : 215.09::.ft2
Q = - 0.0199 cfs
c) Volume Draining fo In-Situ Soll, V = d*A, ft2
d =Depth of water draining to in-situ soil, in
A =Surface area draining to in-situ soi , ft
d = 6 in
A = 215.09 ft2
V = 107.55 ft3
d) Time to Drain the Swale = V/Q, sec
V = Volume drained, ft3
Q =Groundwater flow, cfs
V = 107.55 ft3
Q = 0:0199 cfs
Ta = :::5400
Td = 1.50 hr
Check; Snee the water held in the Swale after the Jevel spreader has been activated will naturally drain in less than 24
hours, no underdrain wall be necessary.
Page 5 DA 7

~ n --, .T'; e~i`~ i~ ~ '~ri, ~ i~ ~^~ T ~ i4 J ~, 1 - rrya~ a .~ ~~ ~~~ .~
ATTACHMENT II
NCDENR LEVEL SPREADER, FILTER STRIF, AND RESTORED RIPARIAN BUFFER
SUPPLEMENT WORKSHEETS

_.__ . _
r ~..~.~_~,..~El',.a .....................................................................................................
•lJ.
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
This form must be filled out, pnntod and submitted.
` ~,
~.
Projectname i
Contact name
Phone number. , , , ~ _ _ _ -
Date.. ~ I
.Drainage area number ;,
For Level Spreaders Receiving FlowFrom a Bf~1P
Type of BMP
Drawdown flow from the BMP cfs
For: Level Spreaders Receiving Flowfrom the Drainage Area
Drainage area ft2
Impervious surface area ft2
Percent impervious 0.26 (2l ~,
Rational C coefficient
.. __
Peak flow from the 1 in/hr storm 1:971477824 cfs
Time of concentration min
Rainfall intensity, 10-yr storm in/hr
Peal< flow from the 10-yr storm 14:234GB9&9 cfs
Where Does the Level Spreader Discharge?
To a bioretention cell? (Y or N)
To a wetland? (Y or N)
To a filter strip or riparian buffer? (Y or N)
Other (specify)
Filter Strip or Riparian Buffer Characterization (if applicable)
Width of grass. ff
Width of dense ground cover tt
Width of wooded vegetation - ft
Total width ft
Slope{from level lip to to top of batik) o0
Are any draws present? 1Y or N)
LevelSpreader Design
Forebay surface area sq ft
Feefof level lip heededpercfs 65 ft/cfs
Answer ..Y.. to ohe of the following:
Length based on the t ih/hr storm? IY or N)
...
Length basad on the 10•yr, 24•hr storm? ~ . (Y or N)
Length basal on the BMP discharge rate? (Y or N)
Desigh flow cfs
Is a bypass device provided? _ (Y or N) 0~x
Form SW401-Level Spreader, FlterStrip; Restored Riparian Buffer-Rev.2 Parts I. andJl. Design Summary, page 1 oF2

Length of the.level lip ft
Are level spreaders in series? ~ (Y or N)
Bypass Channel. Design (if.applicable)
Does the bypass discharge through a wetland? (Y or N)
Does the channel enter the stream at an angle?
Dimensions of the channel (see diagram below): _
M m ft
B fT
W _R
y ft
Peak velocity in the channel during the f0-yr, 24-hr storm. cfs
Channel lining material
~~
t ,., t
M _, -._. _ , ~ M
' B
Form SW401-Level Spreader, Filter Strip,. Restored Riparian Buffer..-Rev.2 Parts I. and ll. Design Summary, page 2 of 2

17..~ ~

.. ,.

., :.
I,.. ~ , -._._--

---- - -
- _ __

Please indicate thee. page or plan sheet numbers where the supporting documentation can be found. an incomplete ubmittal package will
result in a request for additiona l information. This will delay final. review and approval of the project. Initial in the space provided to
indicate he following design. requi rements have been. met. If he applicant has designated an agent, the agent may initial below.: If a
requirement hasnot been met,: attach justification.:
Paget Plan.
Initials 5heetlwlo. ~- il-~is sCC~,le wit1, ~'1o-F ~-e.c~sc~necchl~~ ~~- ~t-~ s~-c~`rrctc`.>r"ca
~
S '~ ~~ ;1~ 3ti~~. c.vns-t-~rvC~c~ dsc~w~r~c~s . i.~' -l-~~ Shee-ti- ~~, rlt.,'~
1. Plans (~---g9` er-larger-} of the entire site showing: v~~; ;!ale. , c~ s u~le,~~,,rt-t-a:\ s~-t~e;~ cc"vrl
Design: at ultimate build-out, b e. ~~0~~~32d
Off-site drainage {if applicable},
Delineafed drainage basks {ieel~de-R-atioaahG~coaf#ici>ynt-per-basinj, i ~ni s \ S ~ tlc,lvde d ~ n k~-~
Forebay (if applicable), ~~-~c~_%h~; c~lc~lc,~-h erns .
-High flow bypass system,:
Maintenance access,
~~" ~= - . drainage. easement and public. right of way (ROVE, and
Boundaries of drainage easement
~~ V>'~ t~ 2. Plan details (1" ~--~0'•er-lar~r°) for the level spreader showing: °t~>;~ sc~~4l~, i~.s ~~Ll s~ics=~ ~g~~-~~'~c'~~
Farebay (if applicable), ~~ cY1_S ~:;;~~lcta-~ ~~~ ~-~.e c<=r1`:~~"~ c.~
'
c
-High. flow bypass system, d~~~wtno~s . ~~ -~tri~s stt~2.~ ~~ :~~-
• One foot topo lines between the level lip and top of stream bank, v`~°~l~ , `~~ ~`-'Pt 1w>~'~e~F~~.1
~er~
-~~ i
.
~
' ~- ~? .~,,;., + ~ drainage easement, and SH~~ c~~,n ~~~. ~4
-Design at ultimate build-out.
~t w~ th 3. Section view of the level spreader (~'+~'--_~-~ ' ~~ _ r) showing::: ~e'<~rt~a ~ ~ a~- ~ S~;ti~t? ,
- Underdrain ystem (if applicable),: :
-1_evel lip,
Upslope channel; and
- Downs ope fil#er fabric,
l~ • : 4. A-date-s#a~ped photograph of the filter strip that clearly shows the type of vegetation thatis present.
~~ A c:l r t2. S-t-c~c~vt~ ~s n~T ~ i-he, p1~c-E-Ci , b~c.~veVer-, c~\ 1 p1~u`~S
cr ~0/3`,la~-
tct~lC~~
\.J2~t', -t-c~~v~ en
,
.
5. An assurance that. the onstalled system wiN meet design specifications Upon initial operation once the
project is complete and the entire drainage area is stabilized. ~~
_.~ ~~ 'd3 g~=1 ~F 6. A construction sequence that shows how the level spreader will be protected from sediment until the entire
drainage area is stabilized.
1-~ -D~ ~ 7. The supporting calculations.
~~~,.~~_ tom. '~ 8; A copy of the signed and notarized ihspectioh and maintenance (I&M) agreement,
9. A copy of the deed restriction.
°~ S
~~L i~ ncj- ~~~~e.~'c1y ~\~de~ ec~~-1"~--r~C'c 4~ ~~r~c~-~n cc?~lsfivc.'nc~n sv~ev'v~s'<~n
rr
#~^r: '~1~1-~.S^~' t~~.l'L, S7vr~Ct:~-',\r~:: C~.1`lti: °zS~lrc:.\~ ~'-`~~lJ~!`~~.YlCtit'\C~S. :

: Form SW401-Level Spreader; Filter Strip, Restored Riparian Buffer-Rev.2 Part III, page 1 of 1

- .r~r:
STORMWATER MANAGEMENT PERMIT.APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
This form must be tilled out, printed and suf?;nlt!ed.
,. _..
_ _ _..
.Project name + , , : ,
Contact name
Phone number.
Date r _
Drainage area number -
I i
Far Leuel Spreaders Receiving Flow.From a B~~~P
Type of BMP
Drawtlown flow from the BMP cfs
For Level Spreaders Receiving Flow from the Drainage Area
Drairage area ft~
Impervious surface area s ft~
Percent impervious Q.27 f _ ~
Rational C coefficient
Peak flow from the 1 in/hr storm Q492956841- cfs
Time of concentration Amin
Rainfall intensity, 10-yr storm in/hr
Peak flowfromthel0-yrstorm 3:559t48393 cfs
Where Does the LevelSpreader Discharge?
To a 6ioretentioh cell? (Y or N)
To a wetland? ('Y or N)
To a filter strip or ripariari buffer? (Y or N)
-0ther (specify)
Filter Strip or Riparian Buffer Characterization (if applicable)
Width of grass. tt
Width of dense ground cover --- _ ft
Width of wooded vegetation ft
_ _...
Total width _ ft
Slope (from ievel lip to to top of bank) _ s~7°
Are any draws present? (Y or N)
Level Spreader Design
Forebay surface area sq ft ~~
Feet of level lip needed per cfs 65_ _ fUcfs
Answer "Y' to one of the following:.
Length based. on the 1 in/hr storm? (Y or N)
Length based. on the 10-yr, 24-hr storm? (Y or N)
Length based on the BMP discharge rate? ~ (Y or N)
Design flow cfs
Is a bypass device provided? _(Y ar N)
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.2 Parts I. and ll. Design Summary, .page 1 of 2

Length of the level lip ft
Are level spreaders in series? (Y or N}
Bypass Channel Design (if applicable)
Does the bypass discharge through a wetland? ®tY or N)
Does the channel enter the stream afan angle?
Dimensions of the channel (see diagram below}:
,.
1~ ft
__..
B ft
W , ft
ft
Y
Peak velocity. ih the channel during the 10-yr, 24-hr storm cfs
Channel lining material
\~
~- 1_
1 ---------- - .. -- -
M 'M
_R
:Form SW40t-LeveLSpreader, Filter: Strip, Restored :Riparian Buffer-Rev.2 Parts I. and: ll. Design Summary, page 2 of 2

.mss
~ _ _ --- - -
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 finale review and approval of the project.. Initial in the space provided fo
indicatethe 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
Tl-u S C csl 2 ~u 1 ~ 1 r10'~- ~e.4ti S G?YICLHJ ~ ~ ~ ~- C~ S ~- c~t'\ e1 c~rrcl
Initials Sheet No. ~/" f
s~~2 c--e,ns-l-~ruC:~-,cx~ d~rC'..w~ric~S ..~._~ -~h~S Sh~~" « ~1crk
~~__S~ ~}a~ lip 1. Plans(-'--5(a'er-lamer-)ofthe entire site showing: ~,~_;,~,1~ , ~°~~,,~~1~~,1e~~\ s4~~~-~ ~~
-Design. atuftimatebuild-out, b~ ~~~~~c~
-.Off-site drainage (if applicable),
Delineated drainage basins (inelade-Ra#tonal-G~oef#i~ient-pe~basinj, TY,i s ~ ~~ rtic.l~~.e ~ t n Vie..
Forebay(ifapplicable), c•,-~F-c~.~h~~r c~tc~'tc~.-~~c~AnS:
-High flow bypass. system;
Maintenance access,
-~k ~~~ -•f'~e~~ ~..:,J drainage easement and public right of way (R01M, and
Boundaries of drainage easement.
~~a J} icr~ 41r 2. Plan details (1" = 30' or larger) forthe level spreader showing:
Forebay (if applicable),
-High flow bypass. system,
-One foot topo lines between the level lip artd top of stream bank,
.. - - R~+?d drainage easement, and
Design. at ultimate build-out.
`~ ~ I~' ~ 1 ire 3, Section view of the level spreader (1"-=-~@'-~or'~ r}showing: i~~-~L~~9 v, c-~- 'rte ~.~ ~--r v~
Underdrain system (if applicable),
Level lip,
Upslope channel, and
Downslope filter fabric.
l ~ f ~i'° - 4, A-date-stamped photograph of the filter strip that clearly shows the type of vegetation thaf is present.
~`~ A cich.-~2. S-1-cte~~ ~S tho=` a~n i-~ne, rho'c-c, , v,c~.~ev~r, cl t P4~c,°tvS
5. An assurance that the Installed system will meet design specifications upon initial operation once the
~j project is complete and the.entire drainage area is stabilized,
~!- l }e~ 6. A construction sequence that shows how the level spreader will be protected from. sediment until the entire
drainage area is stabilized.
~_ i"~ ~~ ~- 7. The supporting calculations:,
~~~~ :?~ 8, A copy of the signed and notarized inspection. and maintenance (I&M) agreement:
9. A copy of the deed restriction. ~ ~~
S ~ mac. ~ s (7 c1- c~~ Y-ex~-1~y t/~de~ ecv,-~-~r-~C~ ~ -~~-~cr-~n c. cart 5~-~u ci~, c~ s u ~Y V is ~ can
~~ ~tn~:aQ lev2\ S'7a e~~~~rs ~~ ~'ne~c- ~~,~vr~e_r~c~c~c~S .
~ ~ ~ht`~ ~s t~e~atr~c~ : evil c~-~ ~h~. S~~~rnwcx-1~v° ~1c~,r;.
Form SiN401-Level Spreader, Filter Strip, Restoretl Riparian Buffer-Rev,2 Partlll, page 1 of 1

w.i~. .-.
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM.
Tnis form must be filled o ut, printed and submitted.
P is ~ - ~ F'. i 1" ::::
ProjecTname -
Contact name ,
_ - _®
Phone number: _ ~'"
Date::: ~ ~ .
-
Drainage area number
__
_ __
i ,, :i~I!i;' __
For Level Spreaders Receiving Flow From a Biv1P
Type of BMP
Drawtlown flow from the BMP cfs
For Level Spreaders Receiving Flow from the Drainage Area
Drainage area ft2
Impervious surface area ft2
Percent impervious
Rational C coefficient
_
Peal<flow from the 1 in/hr storm cfs
Time of concentration min
Rainfall intensity, 10-yrstorm _ min/hr
Peak flow from the 10-yr storm cfs
Where Doesihe Level Spreader Discharge?
To a bioretention cell? (Y or N)
To a wetland? (`r or N)
Tb a filter strip or riparian buffer? (1' or N)
Other (specify)
FilterStrip or Riparian Buffer Characterization (if applicable)
_
Width bf grass ft
Width of dense ground cover ft
Width df wooded vegetation ft
Total width tt
Slope (from level lip to to top of bank) __ °io
Are any draws present? I (Y or N)
Level Spreader Design
Forebay surface area sq ft
Feet of level lip needed per cfs 65 fUcfs
Answer ..Y.. td one of the following:
Length based on the i in/hr storm? (Y or N)
Length based on the 10-yr, 24-hr storm? ' ! (Y or N)
Length based on the BMP discharge rate? (Y or N)
Design flow _ cfs
Is a bypass device provided? ___ (Y or N) :fir;
Form SW401-Level Spreader, Filter Strip; Restored Riparian Buffier-Rev.2 Parts L and II. Design Summary, page l of 2

Length of the level lip ft n
Are level spreaders in series? (Y or N}
Bypass Channel Design (if applicable}
Does the bypass discharge through a wetland? (Y or N}
Does the channel enter the stream at an angle?
Dimensions of the channel (see diagram below}`.
M ft
B ft
W ft
Y ft
Peak velocity in the channel during the 10-yr, 24-hr storm cfs
Channel lining material
M .. _ .: _ M
B
Form SW401-Level.Spreader, Filter Strip; Restored Riparian Buffer-Rev 2 Parts I. and ll. Design Summary, .page 2 of 2

T~,~ ; . ~
,_ - -
,. ., , .. .
,:., . .
---- -
Please indicate the page or plan sheet numbers where the supporting documentation can be found,: n 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 o
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 jus#ificatian.
Pagel Plan
~ T1niS sCc~l~ wii\ ~'lo-~ r2.caSe~etil~l~ ~y~- ~1 S~~~~le~c~`c~-ea
Initi IS Sheet ~~o. ~/` - I
3~~Q ~v,n.~~-ruck-,cam c1~-c~w,nc~s .:,~~ 1-hts S~ryee-~- i~ ~c~C
~ o~ I~ 1. Plans (~59-er-largen) of the entire site showing: v\s •,~1~. , ct` s ~~~1e ~n ~.v~t-c~\ s4-~Q~.~- cc
Design at ultimate build-out, ~ ~ ~~DV~c32..c~
-Off-site drainage {if applicable),
Delineated drainage basins (i~efade-Ratio»a4-G-~oef#i~ient-peg-basinj, Tanis ~ ~ ;roc\~d2~ ~ n 'S-~r-~~.:
fir. -(+€-ate'-,,l~;j, / «-'rkc~.~ch~ c~\c.~1c~-h~~;+n5.
: : : : : .:~: .r. _'_ HI'.... (1L~ (((~t".LC.'aS&r~ -F U.^. : : c:.~Ic S,
: : : : : }V•-: S :: (tsPv : Y`~'-c,.a GtJ L~ ~-- -. S 2t~ S c.,~~ u r^ ~-<i~ ~:. : ::
-Maintenance access,
R•er~d drainage easement and public right of way (ROW), and
Boundaries of drainage easemenf.
"t. ~ ~°"~' 1{~ 2. Plan details (~ " = far~er) for the level spreader showing: ilni,~g e~„c.c°~~~ ~ era ~
- Forebay (if applicable), ~~v;.~.sc~rtia~>\~ ~$t~c\ v ty'rcti~ec~e~..~ d
-High flow bypass system, sc ~c:~•nskruc-1 icon ~,r-c~..~~~ir~. S ,
-One foot topo lines between the level lip and top of stream bank, ~``' ~~ ~`' `~'~ ~`5,~~,~~' ~
-,~ pied dl-ainage easement,. and ~~~~ \2:~r2~i\~-r~~. sti~+~=r c~~ kax
- Design at ultimate build-out. P~a~r~d~ .
°t `-' 1 lit v~=1~,, 3. Section view of the level spreader (" •~8'-a~4arc~r) showing: `3`~c'-°rc`~r1 c~c-t ~ `-~~=~`~ <~
- Underdrain system (if applicable),
- LeveFJip,
- Upslope channel, and
- Downslope filter fabric.
~ ~ V- /. 3T. 4. A~'''"sped photograph of the filter strip. that clearly shows the type of vegetation that. is present,
A d~~\-~. S-V-ctv~vi~ ~s nc,-~r cr1 -4-one.. plno~v , V~c~evtr-, ,~~\ ~ Phu~S
we:~t., -t-c~.~v~ cn , is i~ I c~ ~"r ,~lati 10~
5. An assurance that the installed system will meet design specifications upon initial operation once the
project is complete and the entire drainage area is stabilized.. ~
13 `~ i 6. A construction sequence that shows. how the level spreader will. be protected from sediment until the entire.
t ~ ~~ ~ ,~ drainage.area is stabilized.
1 ~"~'~-`,'~i~ 7. The supporting calculations.
~~ ~ _._ 8. A copy. of the signed and notarized inspection and maintenance (I&M) agreement,
9: A copy: of the deed .restriction. -~
S ~ ~L ~ ~ nU-~ ~v~ e.~n-~-1y U~dew- ec~-hrc~C~ ~ ~~wTo~°~n c cArls~m;c.-1-~ ccn s~~?~rvist~l
~e~ ~~e.'~ t~~e-1 S~rr"Qt~c~~S ~~,d ~ncz~~ ~~~vt~-~-~~r1c~s1CP. .
'~ ~ ~rti~s ~s ~~~~~R~ w-~r~vc~ v-4- -~-'r-,~ s~~~rv~wc~~vr ~lcun.
Form SVV401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.2 Part Ill, page 1 of 1

,.
i
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM.
This farm must Ue filled out, printed and sribrnitted.
,, ,
i ~~~~~.`; ~ !l;, ~. ,~.E
_. .. __ - _
Projecrname ,
-
Contact name
Phone number. ~, -
Date:::
Drainage area number '' _
__
~ iE 3 ;`
,
- - - ' - - - . _ __.. _ _ _ _. .~.._ _. __ _...... _..... _.I
:For Level Spreaders Receiving Fiow From a B~~~P
Type of BMF
Drawdown flow from the BMP cfs
.For Level Spreaders Receiving Flow from the Drainage Area
Drainage area::: ~, ~ . ftz
Impervious surface area ft~
Percent impervious 0.27 (-~--~ ..
Rational C coefficient
Peak flow from the 1 in/hr storm 0.4457g563~ cfs
Time of concentration min
Rainfall intensity, 10-yr storm _ in/hr
Peak flow from the 10-yr torm 3.225799534: cfs
Where Does he Level Spreader Discharge?
To a bioretention.cell? (Y or N)
To a wetland? (Y or N)
To a filter strip orxiparian buffer? ~ (Y or N)
Other (specify)
Filter Strip or Riparian Buffer Characterization (if applicable)
Width. of grass ft
Width. of dense ground cover it
Width. of wooded.vegetation ft
Total width ft
Slope (from IevelJip to to top of bank). %
_.~~.:
Are any draws present? ' _ (Y or N)
Level Spreader Design
Forebay surface area sq ft
Feet of level iip needed per cfs 6~ ft/cfs
Answer ..Y.' to one of the #ollowing:
Length based on the 1 in/hr storm? (Y or N)
Length based on the 10-yr, 24•hr storm? I (Y or N)
Length based on the BMP discharge rate? I (Y or N)
Design flow _ r_.fs
Is a bypass device provided? (Y or N) ~~ <
Form SW401-Level Spreader, FilterStrip, Restored Riparian Buffer-Rev.2 Parts I. and II. Design Summary, page 1 of 2

Length of the evel lip ft '
Are: level spreaders in series? (Y or N)
Bypass Channel Design (if applicable)
Does the bypass discharge#hrough a wetland? (Y or N)
Does the channel enter thestream at an angle?
Dimensions of the channel (see diagram below)::
M ft
B ft
W ft
y _ ft
Peak velocity in the channel during the 10-yr, 24-hr storm cfs
Channel liningmaterial:::: ~~ ~~ ~ ~~~
_______________I
~ ~ . ~ ,„ t
M ' - ,; V M
B
.Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.2 Parts I. and II. Design Summary, page 2 of 2

~~ T ~
,._1 a- __ - - - -- --
Please. indicate the page or plan sheet numbers where the supporting documentation can be found. Hn incomplete submittal package will
result in a request far additional information. This will delay final revievvtiA and approval of theproject. Initia- in the space provided#o
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 ~o. ~- his scale wi t l ~~0=1- c-~~tisc~et>~I~I ~i~ ck~ skc~`nclc~~ca
si ~2 ~ o~ s-1-ru C.~, cry d ~re~w ~ n s . ~._~ -4-hS S1~e.2-F• i~ ~lf~c
~° ~ ll,~ 1. Plans (~---59'-er-far~er-) ofthe entire site showing: ~~5 ~~\e. , a~siJ~yaleme.,r,-r~\ s4-~~-e-'r cc~:~
Design at ultimate build-out, b e. ~~v ~~2~
Off-site drainage (if applicable),
Delineated drainage basins (itaelude-Ra#tonal-GcoefficiErkt-p~basinj, i +ni5 i ~ ~,1c,iv~d l n ~
Forebay (if applicable}, c~-~-c~~h~. c~~ac.~lc~-h~e~S.
-High flow bypass. system:,
Maintenance access,
-~• ~ - Reeer~sd drainage easement and public right of way {ROVI~, and
Boundaries of drainage easement.
`"~' t~ 2, Plan details (1'° = 30' or larger) for the level spreader showing:
-Forebay (if applicable},
-High flow bypass system,
- Onefoot topo lines befween the level lip and top of stream bank,
R~~~~;:>~ drainage easement, and
-Design at ultimate build-out.
~`(~ lt~ 3. Section view of the level spreader (1"- „ _r) showing: `r~~-~~-~ti~ r°+c~- '~~> ~c~°"~`'~-
- Underdrain system (if applicable),
-Level lip,
- Upslape channel, and
- Downslope filter fabric,
Air. ~ 4. A-date-stared photograph of the filter strip that clearly shows the type of vegetation that is present.
A etr~-~'~ si-ct~~n~ is no-T ~ -1-F~e.: plna-F'c~ , Y,c~.~ev~~y ~~ 1 P~r`G~S
L~1t~-~C'2y ~r.~~ vl CN1 , ~C f?~ d C~ c"`- ~aJ31 I G
5. An assurance that the installed system will meet design specifications upon initial operation once the
project is complete and the entire drainage area is stabilized, r
i3 ~~ lta 6. A construction sequence that shows how the level spreader will be protected from sediment until the entire
drainage area is stabilized.
_~~~ 1'#~ ~>~~ 7. The supporting calculations.
~. 8. A copy of the signed and notarized inspection and maintenance (I&M) agreement.
g. A copy of the deed restriction. '~':~
S ~ ~L ~s n~ c~-~..~n~1y u~de~r cc.n-~-ctC~ 1-~ ~c~.~--Fo•r-rv~ cc'~nS~uc`,-'c~ cY7 s~~~rv~s~an
k~n?2.~~ leve.\ ~`}~v''E;c~:~~.~5 cz~~ct -'~-'r°~rz~c' ~~y~v~-~-l-~~c,:s.1cC's
'~ ~ ~(s ~S ~e-~td~Rc~ ;--ovc~>, e~-~ -14~c~ S~~mwc~~~- p1c~:~.
Form SW401-Level Spreader, Filter Str+p, Restored Riparian Buffer-Rev.2 Part III,.page 1 of 1

Ei [.--
3
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
.:::401 CERTIFICATION APPLICATION FORM:
i his form must ve filled out, printed and submitted.
(~ i' ~ ~~ ~!".Ti'~~
F?roject name
Contact name
Phone number.:: r
...
Date:::
Drainage area number
__
.For Level: Spreaders Receiving Flow From a Bm~P
Type of BMP
Drawdown flow from the BMP cts
For. Level: Spreaders Receiving Flow from the Drainage Area
:Drainage area::: _ _ftz
Impervious surface area ftz
.Percent impervious G.35 ~ ~~ ~'U~?
:Rational C coefficient
:Peak flow from: the 1 in/hr storm m 0:432569550 cfs
Time of concentration min
Rainfall. intensity, 0-yr storm in/hr
:Peak flow from. the 10-yr storm 3:1:231:5221:8 cfs
Where Does the Level Spreader Discharge.?
To a bioretention cell? i' (Y or N)
To a wetlands (Y or N}
Ta a filter strip or riparian buffer? f Y or N)
Other (specify)
.Filter Strip or Riparian: Buffer Characterization (if applicable)
Width of grass ft
Width of dense ground cover ft
Width of wooded vegetation it
Total width fl
Slope (from level ip to to op of bank)
Are: any draws present? (Y or N)
Level Spreader Design
Farebay surface area sq ft
Feet of evel lip needed percfs ° 65 ft/cfs
Answer' Y to one of the following::::
Length based on the 1 in/hr form? (Y or N)
Length based on the 10-yr, 24-hr storm? tY or N)
Length based on the BMP discharge rate? fY or N)
Design flow cfs
Is a bypass device provided? (Y or N) {~ K
Form SW401-Level Spreader, Filter Strip, Restored Riparian Burfer-Rev.2 Parts I. and 1. Design Summary, page 1 of 2

Length of the level lip ft
Are level spreaders in series? (Y or N)
Bypass Channel Design (if applicable)
Does the bypass discharge through a wetland? (Y or N)
Does the channel enter3he tream at an angle?
Dimensions of the channel (see diagram below);
M - - -ft
. __
8 _ _ it
UV it
Y _ _ tt
Peak velocity: in he channel during the 10-yr, 24-hr storm cfs
Channel liningmaterial ~ ~~
~>_
,, t
M ,., _ M
B
Form SW401-Level Spreader, FilterSfrip, Restored Riparian Buller-Rev.2 Parts 1. arid 11. Design Summary, page 2 of 2

~~~ ~ ~
;- - -- - -
---
~i;. ~ i~ ~ - __ _-- -- -- - -~ __
Please indicate the page or plan sheet numbers where the supporting documentation can be found. Hn incomplete submittal package will
result in a request for additional information. This vaill delay final review and approval of the project. Initial in the space provided to
indicate he 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
~i s settle wi i 1 ~1a-1- c°~.ctiSe~nctihl~ ~~~- q-~ S-~-~~v>~c:t~-~~
Il i Sheet No.
~i~~ cons-t-ruC.'nc:~n d.rc~w~nc~s . ~~ -1-~niS S`nes~-~- ~~ nc~
"~~ 1. Plans (~-5(~'-er-aar-ger-) of the entire site showing: ~~C~ t~~,z A- s ~,.~~~ ~~,~~~~ s4-~~~~ ~,
- Design. at ultimate build-out, b ~. ~~ov id2c;#
Off-site drainage (if applicable),
Delineated drainage basins (ir~ek~de-Ra#iew~tl-G~ooefficient peg-basin),. ~ni s i S ~ r`~c1~d.2~ i n ~-~r~e,:
-Forebay (if applicable), «~c~ch2x~, c~tc~ l c~-l~~ r:~s
-High flow bypass. system:,
_ Maintenance access,
=~. _ - Fi.. drainage easement and public right of way (ROVE, antl
Boundaries of drainage easement:
~~~ l e4=1t~ 2 Plan details (1" = 30' or larger) for the level spreader showing;
Forebay (i# applicable),
-High. flow bypass system;
-One foot topo lines between the level lip and top of stream bank,
:y - f~ _ _ed-drainage easement, and
Design at ultimate build-out.
1'~ G~ ita 3, Section view of the level spreader (~'°-z~~_; _ ~ showing: ~~.,~_,t ~~~- -~-~ scx~'`~. .
Underdrain system (if applicable),
Level lip,
Upslape channel, and
Downslope filter fabric.
~F = t~__ 4. A-date-sta~+ped photograph of the filter strip that clearly shows the type. of vegetation that is present:.
~~ A ~ c:~-2 S-t-e~rn~ ,~ nc~-Y cn -4-h2 p1~o-t--t; , 1ncA:.~eve~; ct\ ~ phu~S
uJe.~r~E,, -i-ct~zv~ ors , io /3lc"~. ~"r" tial3~ f o~
5. An assurance that the installed system well meet design specifications .upon initial operation once the
project is complete and the entire drainage area is stabilized. -'~
~-~~ l~ ~~ t~ 6. A construction sequence that shows how the level spreader will be protected from sediment until the entire
drainage area is stabilized.
4~' 1-~~=~ 's~#a~ 7, The supporting calculations.
j~-s~ ~ ~. 8. A copy of the signed and notarized inspection. and maintenance. (I&M) agreement.
9. A copy of the deed restriction. -~
~c S v~L 7s nc{- c~.~-re>n~1y ~t~de~ ~c,n-1-~-~ ~-'r 1-~ ~~~c~n cc~~S-~e,-`nc~~~ s~i~~rv~s~c~n
~e?.r -Nr~R:~~? (C,r./21 5'wr'~r~:~L.~S ~~~ +'nrz~s' ~~w~r-~-~~ncti~lC~s
~ ~ ~~i`~ ~S ~ehd,Rc~ : i/~c t c:-~- '~h~ S-1-o~-~rnw c~-1-~~ ~P1cun .
Form SVV401-Level Spreader,. Filter Strip, Restored Riparian Buffer-Rev.2 Part III, page 1 of 1

STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
This form must be filled out. printed and submitted
Project name ~ - ~
- - --
Contact name - - '~ '~ _
Phone number ' ! _
bate _ _ _ _ _
Drainage area number `'
r
I: ~ ~:
For Level Spreaders Receiving Flow From a Bi~iP
Type of BMP
____
Drawdown flow from the BMP cfs
For Level Spreaders Receiving Flow from the Drainage Area
Drainage area _ ft2
Impervious surface area ft2
Percent impervious 0.3`:
Rational C coefficient _
Peak flow from the 1 in/hr storm 0.882838889 cfs
Time of concentration min
Rainfall intensity, 10-yr storm _ inlhr
Peak flow from the 10-yr storm 6.374096 r 78 cfs
Where Does the Level Spreader Discharge ?
To a bioretention cell? (Y or N)
7o a wetland? (Y or N)
To a filter strip or riparian buffer? (Y or N) "- ~ `°
Other (specify)
Filter Strip or Riparian buffer Characterization (if applicable)
Width of grass ft
-- _
Width of dense ground cover _ _ _ _' ft
Width of wooded vegetation ft
Total width ft
Slope (from level lip to to top of bank)
Are any draws present? _ (Y or N) t~
Level Spreader Design
Forebay surface area sq ft ~~It
Feet of level lip needed per cfs 65 ft/cfs
Answer "Y" to one of the following:
Length based on the 1 inlhr storm? (Y or N)
Length based on the 10-yr, 24-hr storm? (Y or N)
Length based on the BMP discharge rate? (Y or N)
Design flow cfs
Is a bypass device provided? (Y or N) ~?IC
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.2 Parts I. and II. Design Summary, page 1 of 2

Length of the level lip ft "
Are level spreaders in series? (Y or N)
Bypass Channel Design (if applicable)
Does the bypass discharge through a wetland? ~ ' (Y or N)
Does the channel enter the stream at an angle?
Dimensions of the channel (see diagram below):
M ft
B ft
W ft
y ft
Peak velocity in the channel during the 10-yr, 24-hr storm cfs
Channel lining material r
-

;. ~
, w
_
_ t
_~
1 ------------

- 1

_ M
M
R ,
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.2 Parts I. and II. Design Summary, page 2 of 2

_ ~. ..
---
--
Please indicate the page or plan sheet numbers where the supporting dooumentation can be found, An incomplete submittal package will
result irr 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.
-Mis scene. we11 t'lo-t- e-'z.ctiscv~,C~b\~ ~~
Initials Sheet fro. ~/ ~ ~--~~ ct-~ s-~- - Vrclc~rca
~ `~ at~~ cans-l-~uC,~-;can ci~'C'~w~nr~s . ;.~`~' -1-hiS Sh~c-~ iS ~lc~
~.L~~__ ~ ~- !t~ 1, Plans(-' --5(~'--er-larger)oftheentiresiteshowing: ~„stF;~~ cam' su~~ernev-~-t-c~\ s4~~~-`~ G'~
Design at ultimate build-out, ~ e. ~,ro~ ~c~2~
Off-site drainage (if applicable),
Delineated drainage basins (it~e{ttde-Ra#io~al~G~oef~iaient per-basin), i Nis s S ~ nclude~l ~ c~ Vie..
Forebay (if applicable), ~-~c~~1~~1 c~~lculc_~-\-i e~S
-High flow bypass system:,
e Maintenance access,
_ed drainage easement and public righf of way (ROVU), and
Boundaries of drainage easement.
``-~~ 1~ c~ (tn 2 Plan details (" ~&e~ia) for the level spreader showing: ~ i~r~~~,~ ~.c~\~ ~ ~~\ ~1c~
Forebay (If applicable), ~~.~'~~~~nctib\y -`~e-\ c~ 5'-~c;.+nclciw~
-High flow bypass system., s~~ cc.~r`~S~"ttiC'~"1`c:,~ d.~cir~~s,~
-One foot topo lines between the level lip and top of stream bank, ~'~ ~\~`~'~" `s ~' ~~~ ~`~ ~~ "~
:~arded~drainageeasement, and `~`-'l~4~1~rr~~~r~~-«.\ st~e2~ c~-~~
c~ -Design at ultimate build-out. ~2 Q"'bv'1 c~1.
~~w~~ ~~f c~ lto 3. Section view of the level spreader (~-'° ~®r) showing: ~,~~~e0 ~a~ ~o Scc.~.\~. .
Underdrain system (if applicable),.
Level lip,
Upslope channel; and
Dowhslope filter fabric.
R~. ~ 4. Aerate-starrrped photograph of the filter strip that clearly shows the type of vegetation that is present.
~~ R ci ~-~2 S-F-c.~vv-~~ ~s n~-~- v~ 1-~ne. ~hc-l-r~ , 1~c:a.~~~1~r'; e \ ~ ~?hv~S
~vJ~~Q, Ttx~vl CX\, 10(310. cr X0/31/0?
5. An assurance thatthe installed system well meet design specifications upon initial operation once the
project is complete and the entire drainage area is stabilized,
_ ~ "~~ 13 ~~ the 6. A construction sequence that shows how the level spreader will be protected from. sediment until the entire.
drainage area is stabilized,
..,- 1-~ ~ la Z The supporting calculations,
~~ .~. 8, A copy of the signed and notarized inspection and maintenance (I&M) agreement:
9. A copy of the deed restriction, ~
S ~ i/c. .~ ~ rl c~ c~~~re.~n~~ ~,~~d ear Cev»-hr-~.C~ t-o t e~~ ~~rn c. r.~~ S-nu cl-~ c.~n s ~ ~ ~v is ~ ran
~~ k4~~.~~ leJ2\ S~~r2~~~e..~rs ~~~ ~~,~c~ r~~w~e.~c~~c~S .
~ ~ ~`S ~~ -~e~n~~i~c~ : o~t~l c.~ ~h2. S-~-a~~wc~~~ p1c~~n.
Form SVJ401-Level Spreader, Filte~St~ip, Restored Riparian Buffer-Rev.2 Part III, page 1 of 1

A , ,.
r s.
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATIQN APPLICATION FORM.
This form must be filled out, ~rirted and submitted.
i s ~„
~~ __ _ _ __
Project name:::: i
Contact name
Phone number
Date
Drainage area n imber '
For Level Spreaders Receiving Flow From a B,~IP
Type of BMP
Drawdown flow from the BMP cfs_
For Level Spreaders Receiving Flow from the Drainage Area
Drainage area. ft2
Impervious surface area ~' ftZ
Percent impervious 026 ("Z~% ~'
Rational C coefficient
Peak flow from the 1 in/hr storm 1.102 ;39715 cfs
Time of concentration min
Rainfall intensity, 10-yr storm fn/hr
Peak flow from the 10-yr storm 7:960336745 cfs
Where Does the Level Spreader Discharge?
To a bioretention cell? (Y or NJ
To a wetland? (Y or N}
To a filter strip orripariari buffer? (Y or NJ
Other (specify)
Filter Strip or Riparian Buffer Characterization (if applicable)
Width of grass ' ft
Width of dense ground cover ft
Width of wooded vegetation ft
Total width ft
._ '
Slope (from level lip to to top of bank).
Are any draws:present? I (Y or N)
Level Spreader Design.::
Forebay surface area sq ft
Feet of level lip needed per cfs 65 ft/cfs
Answer'Y" to one of the following:
Length based on the 1 in/hr storm? (Y or N)
Length based on the 10-yr, 24•hr stormy (Y or N)
Length based on the BMP discharge rate? (Y or N)
Design flow cfs
._
Is a bypass device provided? ('Y or N) .Ott
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev 2 parts I. and Jl. Design Summary, page 1 of 2

Length of the level lip ff
Are level spreaders in series? (Y or N)
Bypass Channel Design (if applicable)
Does the bypass discharge through a wetland? (Y or N)
__e ____________________
Does the channel enter3hestream aYan angle?
Dimensions of the channel (see diagram below):
M tt
B _ ft
W ft
y tt
Peak velocity in3he channe! during the 10-yr, 24-hrstorm cfs
Channel lining material ~ ~ ,
_ _,
..,
t
1 ----------- _ ------------
M M
B
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-ftev.2 Parts I. and )l. Design Summary; page 2 of 2

~~ ~ ~
~~. _ , .
Please indicate the page or plan sheet numbers where he 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 projec#. Initial in the space provided to
:indicate tMe 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 Sheethlo. ~- his scnle i::~ilti ~o~- c-~.ctiscvre~bk~~ ~~- c~-~ 5~~~`~rtctrti'~"ca
3i=i/2 ~a.ns-1~c~,cr~ ds-r'~w~ncs _ ~._~' phis S~ee-F~ i5 rlc~
~- S ~ o~ tf~ 1. Plans (~8-er-lever-) ofthe entire site showing: ~,~5:1~,~~ ~,~~U~~,~,~~~~~.~0 ~~~~~~ ~-
- Design at ultimate build-nut, b ~. P~U ~~2d
-Off-site drainage (if applicable),
-Delineated drainage basins(it~ek~de-f~atle~al-~-coef#iciEnt-per-basinj, 'his iS ~nc,l~d~d ~rz ~-hz:-
-FForebay (if applicable), c~ti~~~ch~ c.r~lc~lc.~.-h c;~S .
-High flow bypass systern;
- Maintenance access,
~~ser~ed drainage easement and public right of way (ROW), and
f~ - Boundaries of drainage easement: :
1~ ~r 110 l~ 2. Plan details (" - 8' er-tar~ew) for the level spreader showing: 'C-h~~~ ~c-~'~~2 ~s'~\t n~`
- Forebay (if applicable), ~.~>enc~4~\~, .{-.;~ r.,r~ c.~'rcivlclca~c1
-High flowbypasssystem; s~~~ cc,nC,-t~uc.:-hcx~ ~rr{~~~~nr_J .
-One foot. topo limes between the level lip and top of stream bank, ~~'t " ~~~-~ ~ ~~ `~~ `~ ``~'`~-,~ > °°
r - f~ drainage easement, and ~ .
- Design at ultimatebuild-out, ~~vtd,~ct .
~~ i'k~ lto 3. Section view of the level spreader (1"-=~9-e~-lsrger)showing: i,~v.'~\ ;~rG~ ~-o ,~ ~~,;\~ .
- Underdrain system (if applicable);
. Level lip;
- Upslope channel, and
- Downslape filter fabric.
r/ ~-.
t~.-f`a .._~~ 4. A-date-s#a~ped photograph of the filter strip that clearly shows the type of vegetation that is present.:
~\._ A d c:-Fz S-1-cxt'vt~ .s nn `~- ~ -4-~r,e.. ~4,o-~-c~ , lnc:~ev~r`, cti11 ~1nv`ivS
U~ ~2, -i-ctk~~n c.~ , ~ c r ~~ l cam, ~ ~a r a ~ l c~
5. An assurance that the installed system well meet design specifications. upon initial operation. once the
project is complete and the entire drainage area is stabilized.
13.E 6. A construction sequence that shows haw the level spreader will be protected from sediment until the entire
r drainage area is stabilized;
. ~-~~.:.._ 4-5 ~t~~ 7. The supporting calculations;
. ~ 8. A copy of the signed and notarized inspection and maintenance (f&M) agreement.
~'"~ 9. A copy of the deed restriction, -~'#
s~~G is nct- cL~~r\~y ~,~~d.e~ ccn-hritC'~ k3 ~er~c~~r*n ccTns-hvc'ricsn s~s~~v~~~o~rt
~e~ -~'v1~.Se le~~e.,1 S~a~ec~:~u-S ~~~ +~~..i~ (:~~v~-~v'~«.~1L~S.
~ ~ 'f1~~s ~s ~e~~~nc~ ~~v~.~ ~-~ the S~-a~~rnwc~-~~ p1c~~n .
Form SW401-Leval Spreader, Filter Strip, Restored Riparian Buffer-Rev.2 Part Ill, page 1 of 1

~'~ `_ elf ! ~.s`1"l l f .'~1~' ~~1 ~ ~J _U L~1 C ,;' t
ATTACHMENT III
FILTER STRIP, RESTORED BUFFER, AND LEVEL SPREADER INSPECTION &
MAINTAINANCE AGREEMENTS

Permit Number:
(to be provided by DI~Q)
Drainage Area Number: DA #1
1
I_
1 will keep a maintenance record on phis Bi~P. This maintenance record will be kept in a
log in a known set location. Any deficient BTYII' elements noted in thee. inspection will be
corrected, xepaired or replaced. immediately. These deficiencies can affect the integrity
of structures, safety of the public, and the removal efficieincy of the Bir~iP.
Important maintenance procedures:
- Immediately after the filter strip is established, .any newly planted vegetation
will be watered twice weekly if needed until the plants become established
(commonly six weeks).
Once a year, the filterstrip will be reseeded to maintain a dense growth of
vegetation
- Stable groundcover will be maintained in the drainage area to reduce the
sediment load to the vegetation.
- Two to three times a year, grass filter strips will be mowed and the clippings
harvested to promote the growth of thick vegetation with optimum pollutant
removal efficiency, Turf grass should not be ciaf shorter than 3 to 5 inches and
may be allowed to grow as tall as 12 inches depending on aesthetic requirements
(I~TIPC,1993). Forested filter strips do not requixe this type of maintenance.
Once a year, thee. soil will be aerated if necessary.
Once a year, soil pH will be tested and lime will be added if necessary.
.After the filte~ ~~arp is estan?fished, it will be inspeete~? _ ~`' < •- ~ ~;~~ ' ~ s
:Records cif inspection and maintenance tiJill be ?cept in a 1cno~vn set location and will be
available upon request.
.Inspection activities shall be performed as fo?Io-vs. Any problems that are found shall
be repaired immediately.
L'P If':e~em~~it: Potential reblez i . •. , 1 will remedi to the ~rl ebie~n:
The ea.~ae ~~14e_~ strap Trash/debris is present.. Remove the trash/debris.
s~-stem
The fly ~~ s~~latter device The flow sputter device is Unclog the conveyance and dispose
(if a4rpli:<~~le; clo ed. of an sediment off-site.
The flow splitter device is IVlake any necessary. repairs or
damaged.. replace: if damage is too large for
re air.
Form StT40 -Level Spreader, Filter Strip,: Restored Riparian Buffer 1~iM-Rev.2 Page 1 of 3

i3iR ~ ?' eisment: Potential r®bie is a o~ ~ ~ ~ still rQmediate the robiem
t hn swaIe and the level The wale is clogged with. Remove the sediment and dispose
lir~ sediment. of it off-site.
The level lip is cracked, Repair or replace lip.
settled, undercut, eroded or
otherwise dams ed.
There is erosion around he Regrade the soil to create a berm
end of the level spreader hat that is higher than the level lip, and
shows stormwater has then plant a ground cover and
bypassed it. water until it is established. Provide
lime and aone-time fertilizer
a lication.
Trees or shrubs have begun Remove them,
to grow on the Swale or just
downslo e of the level li ,
The bypass channel Areas of bare soil and/or Regrade the soil if necessary to
erosive gullies have formed. remove the gully, anal then
reestablish ro er erosion control.
Turf reinforcement is Study the site to see if a larger
damaged or ripap is rolling bypass :channel is needed. (enlarge if
downhill.. necessary). After this, reestablish
the erosion control material..
~'he filter strip Grass is too short or toollong Maintain grass at a height of
if a livable . a roximatel three to six inches.
Areas of bare soil and/or Regrade the soil if necessary to
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 a lication.
Sediment is building up on Remove the sediment and
the filter strip. restabilize the soil with vegetation if
necessary. Provide lime and cone-
time fertilizer a lication.
Plants are desiccated. Provide additional irrigation and
fertilizer as needed.
Plants are dead, diseased or Determine the source of the
dying. problem: soils, hydrology, .disease,
etc. Remedy the problem and
replace. plants. Provide aone-time
fertilizer a lication.
Nuisance vegetation is Remove vegetation by hand if
choking out desirable species. possible. If pesticide is used, do not
allow it to get into the receiving
water.
'The receiving vsrater Erosion or other signs of Contact the NC Division of Water
damage have occurred at the Quality local Regional Office, or thee.
outlet. 401 Oversi ht Unit at 919-733-1786.
Forme. SWU401-level Spreader, Filter Strip, Restored Riparian Buffer 1&1v1-Rev,2 Page 2 ®f 3

Permit I~Tumber:
(to be provided by DWQ)
acknowledge and agree by my signature below that I am responsible for the
~erf~rmance ofthe maintenance procedures listed above.. i agree to notify ~~`'(~ of any.
.problems with the system or prior to any changes to the system or responsible party.
Project name: Taft ~Uoods East, Level St~reader I~esi
BMF drainage area number: DA #l
Print name: Lauraleen, LLC c/o George Schlecht
Title: ~ana~er
Address: 3515 4'ueen Anne Court, Clayton, C 25727
Phone:: [phone]
.Signature: ./.~-~- G~
Date: r ~'%~ 8~'7
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 tho president.
1, a ~~ ~ . ~° f/~e ; ~ `;!~ , t _ ~, a I~totary public for. the State of
~''~~~:~''~ ('~L,~=~ ~,~~ ;~, County of 7,7.t'?Sil ~µ:~ , do hereby certify that
~?.~) J~- ~ `~~ ~?~~.~`'~ personally appeared before me this
day of ~, ~ _ ~',r' ,F °' , , ''~, and acknowledge the due execution of the
.forgoing filter strip, riparian buffer, and/or level spreader maintenance requirements.
V~Vitness my hand and official seal,
SEAL
My commission expires~,~''~ ~~t~..~ -e c. ~ ~~
r
Form SwU4U1-Level Spreader, Filter Strip,: Restored Riparian Buffer 16 ,~: iv-Rev.2 Page 3 of 3

Permit Number:
(to be provfded by D&~QJ
Drainage Area Number: DA #2
_ ~ ~~
t ~ - - , ,:
~~ F ,.~
Twill keep a maintenance record ®n this B~rP. This maintenance record will be kept in a
log in a known set location. Any deficient BIV1P 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 BIVfI".
Important maintenance procedures;
- Immediately after the filter strip is established, any newly planted vegetation
will be watered twice weekly if needed until the plants become established
(commonly six weeks).
- Once a year, the filter strip will be reseeded to maintain a dense growth of
vegetation.
- Stable groundcover will. be maintained in the drainage area to reduce the
sediment load to the vegetation.
- Two-to three times a year, grass filter strips. will be mowed and the clippings
harvested to promote the growth of thickvegetation with optimum pollutant
removal efficiency. Turf grass should not be cut shorter than.3 to 5 inches. and
maybe allowed to grow as tall as 12 inches depending on aesthetic. requirements
(I`ITPC,1993). Foested filter. strips do not ~:equire this type of maintenance:.
- Once a year, thee. soil will be aerated if necessary.
- Once a year, soil pH will be tested and lime will be added if necessary,
After the filter strip is established, itw? } t be inspectPCl . _ ~ , :' ~ :.: ~ ,;
_ ." _. 4' `. _ .`,rte ~ _.. _~. L. ~ J Le i ___," _ '4~T).
Z1 ~ - ,)
Records of inspection and maintenance will. be kept in a';no ~ vn set location and will be
available upon request.
Inspection activities shall be performed as follows. Any. problems that are found shall
be repaired iunmediately.
~~~'~• 'element: Potential roblems I-low I will remediate the roblem:
"~'he _ntire filter strip Trash/debris is present.. Remove the trash/debris.
~VStnm
Po a ~e flaw sputter device The flow sputter device is Unclog the conveyance and dispose
(if .~ ~~plicable) clo ed. of an sediment off-site.
The flow sputter device is Make any necessary. repairs or
damaged.. replace if damage is too large for
re air.
Form SV4~LLT401-Level. Spreader, Filter. Strip, Restored Riparian Buffer I&IvI-Rev.2 Page 1 Of 3

~~~=,~a~= ele:nPnt: Pot~r~i:;l noble ':9031 ; 4.vit1 rennedi~ tithe robletn:
'E'lbe s~vale .nd the level The Swale is clogged wi#h Remove the sediment and dispose.
iii; sediment. of it off-site.
The level lip is cracked, Repair or replace lip.
settled, undercut, eroded ar
otherwise lama ed.
There is erosion around he Regrade the soil to create a berm
end of the level spreader that that is higher than the level lip, and
shows stormwater has thenplant a ground cover and
bypassed it. water until it is established. Provide
lime and aone-time fertilizer
a lication.
Trees or shrubs have begun Remove them.
to grow on the Swale or just
downslo e of the level li .
The bypass channel Areas of bare soil and/ or Regrade the soil if necessary to
erosive gullies have foxined. remove the gully, anal Then
reestablish ro er erasion .control.:
Turf reinforcement is Study he site to see if a larger
damaged or ripap is rolling bypass channel is needed. (enlarge if
downhill.. necessary). After this, reestablish
the erosion control material..
3'he filter strip Grass is too short or too Hong 'maintain grass at a height of
if a licable . a roxmatel three to six inches.
Areas of bare soil and/ or Regrade the soil if necessary to
erosive gullies have formed. remove the gully, and then plant a
ground cover and water until it is
established. Provide me and a
one-time. fertilizer a lication.
Sediment is building up on Remove the sediment and
the filter strip. restabiiize the soil with vegetation if
necessary.. Provide lime and aone-
time fertilizer a lication.
Plants are desiccated. Provide additional irrigation and
fertilizer as needed.
.Plants are dead, diseased or Determine the source of the
dying. problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants. Provide aone-time
fertilizer a lcation.
Nuisance vegetation is Remove vegetation by hand if
choking ottt desirable species. possible. If pesticide is used, do not
allow it to get into the receiving
water.
The receiving water Erosion or other signs of Contact the NC Division of Water
damage have occurred at the Quality local Regional Office, or thee.
outlet. 4Q1 Oversi ht Unit at 9~ 9-733-17$6.
Forme SWi,JJ401-Level Spreader, Filter Strip,: Restared Riparian Buffer l&-Rev.2 Page 2 ®~ 3

Permit I*tumber;
(to be pravitleect by .~ FJQ)
1 acknowledge and agree by my signature below that 1 am responsible for the
perfarmance of the maintenance procedures. listed above. I agree to notify ~`~' ~ of any.
problems with thee. system or prior to any changes to the system. or responsible party.
Project name: Taft 4~laods East, Level Spreader l3esian
B.wIP drainage area nu~~aber: DA #2
Print name; Lauraleen, LLC clo reorge Schlecht
Title: ~lana~er
Address: 3515 Queen Anne Court, ~layton,-NC 25727
Phone: (91 ~) 427-~05b
Signature. ~ ~/~--~-'
Date:: i ~-/ ~~ ~
i+?ote 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, ~r ~''# %_ ``~• ~ ~: Ih.~J~ ~~~ _ , a l~Totary Public for the State of
11
~d~~_~ ~~ (~~r r. ,~, ,County of~E~~'~ C-~~~ , do hereby certify that
G ('~y .v ~-1 ~ personally appeared before me this. ~~~`
day of _ . ~r~~',? : ,and acknowledge the due e:~eeution of the
forgoing filter strip, riparian buffer, and/or level spreader maintenance regt~irernents.
~Jitness my rand and official seal,
SEAL
~ CQmm1SS10n ex Tres ~ ~ u ~. , s f T , ~{~
y r ~.-.- _,.__ __.-~--
Form S~TVIJ4ol-Level Spreader, Filter Strip; Restored Riparian Buffer I&ie~l-Rev.2 Page 3 of 3

Permit i~Tumber:
{to be provic~eed by D~Q)
Drainage urea.Number: DA#3
~~ ~ ' ~,
,,
I will keep a :maintenance record on this Bli~P. This maintenance record will. be kept in a
log in a known set location. Any deficient B1~P elements noted i~1 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 Bi~TA.
Important maintenance procedures:
- Immediately after. the filter strip is established, any newly planted vegetation
will be watered. twice weeldy if needed until the plants become established
(commonly six weeks).
- Once. a year, the filter :strip will be reseeded to maintain a dense growth of
vege#ation
- Stable groundcower will be maintained in the drainage area to .reduce the
sediment load to the vegetation.
- Two to three times a year, grass filter strips will be mowed and the clippings
harvested to promote the growth of thick vegetation with optimunn pollutant
removal efficiency. T1xrf grass. shotiid not be cut.shorter than 3 to 5 inches and
may be allowed to grow as .tall as 12 inches depending on aesthetic requirements
{1VIPC,1993). Forested. filter strips do not require this type of imaintenance.
- Once a year, the soil will be aerated if necessary.
- Once a year, sail pH will be tested and lime will be added it necessary.
After the filter strip is established, it will be inspected - ~ ~h ~r ~ . ~ ~ ~ ~r =~a ~ > - s
Records of ~ ~espection and maintenance will~be kept in a *.nown set loca~ion and ~~~ill be
available Capon request.. ',
Inspection activities shall. be performed as follows..Arty problems that are found shall ',
be repaixed immediately.
93i~•~}' elebnent: Potential. roblem: iow .t will remediate the robleixt:
'~'h~ ~~tire filter strip Trash/debris is present. Remove the trash/debris.
S`.75inITi
%
~
'~'~~ d`q~r s~slitter device
The flow sputter device is
Unclog. the conveyance and dispose
(ii= a- ~~licable) clo ed. of an sediment off-site.
The flow sputter device is Make any necessary repairs or
damaged. replace if damage is too large for
re air.
Form SWC1401-Level. Spreader, Filter Strip, lLestored Riparian Buffer 1~iNt-Rev.2 Page l of 3

319 ~~ element: ~'~ct-~nt~al ~ roblec ~ <:~ j q~~ill re.~:c=_~iate the roblem
'C'sie s~~~°.~le and the Level The Swale is clogged with. Remove the sediment and .dispose:
Iip sediment., of it off-site.
The evel lip is cracked, Repair or replace lip:.
settled, undercut, eroded or
otherwise dams ed.
There is erosionaround he Regrade the soil to create a berm
end of the level spreader that that is higher than the level lip, and
shows stormwater has then plant a ground cover and
bypassed it. water until it is established. Provide
lime and aone-time fertilizer
a lication.
Trees ar shrubs have begun Remove them..
to grow on the swale or just
downslo e of the level li ,
The bypass ch,~nnel Areas of bare soil and/or Regrade the soil if necessary to
erosive gullies have formed. remove the gully,. and then
reestablish ro er erosian control
Turf reinforcement is Study the site to see if a larger
damaged or ripap is rolling bypass channel is needed (enlarge if
downhill.. necessary). After this, reestablish
the erosion control material..
The filter strip Grass is too hurt or too long Maintain grass at a height of
if a licable . a roximatel titres to six inches.
Areas of bare soil and/or Regrade the soil if necessary to
erosive gullies have formed. remove the gully, and then plant a
ground cover and water until it is
established. Providelime and a
one-time fertilizer a lication.
Sediment is building up on Remove the sediment and
the. filter strip. restabilize the oil with vegetation if
necessary. Provide lime and aone-
time fertilizer a lication.,
Plants are:desiccated. Provide additional irrigation and.
fertilizer as needed.
Plants are dead, diseased or Determine the source of the
dying. problem: soils, hydrology, :disease,:
etc.. Remedy the problem anal
replace plants. Provide aone-time
fertilizer a lication.:
Nuisance vegetation is Remove vegetation by hand: if
choking out desirable species. possible. If pesticide is used, do not
allow it to get into the receiving
water.
The receiving water Erosion or other. signs of Contact the NC Division of Water
damage have occurred at the Quality local Regional Office, or the
outlet. 4~1 Oversi ht Unit at 919-733-1786.
Form: SWtT401-Level. Spreader, Filter Strip, Restared Riparian Buffer IIVl-Rev.2 Page 2 of 3

Permit Dumber:
{to be providedby DWQ)
I acknowledge and agree by my signahare below that I am responsible for the
performance of the maintenance procedures listed above.. I agree to notify l~ ~` :~ of any.
problems with the system or prior to any changes to the system or responsible party.
Project name: Taft ~~Joods East, Level Spreader Resign-
BIVIP drainage area number: DA #3
Print name: Lauraleen, LLC c/o ~'ieorffe Schlecht
Title: liana er
Address: 3515 (queen Anne Court, Clayton, NC 25727
Phone:: [phone]
Signature: '-''
~-
Date:-- r ~'/~ ~ o ~
Adote; 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, ~ r ~`. ~ < ,~/ ~7 [a0 , a Notary Public for the State of
~~- ~)
.-._L'/1~};~ ~.'~ ~ ,c _ ~~gs ,County of_~ r,i~ , do hexeby certify that
t ,~ n~~ ~, `° P~ 1 P~(.','~' personally appeared before me this 1 c~`~l'
day of ~ ' ~,~~1'?,~ , c~C~' i.~, ,and acknov~~ledge the due eeeution of the
forgoing filter strip, riparian buffer, and/or level spreader maintenance requirements.
witness my hand and official seal,
SEAL
,v
viy commission expires ', - ~ ~ ` , r! , , :,, '~ ~ ~Dl 1
Forme S~~JU4U l-Level Spreader, Filter Strip, Restored Riparian Buffer Ic~M-Rev.2 Page 3 of 3

Permit Number:
(to be provided by DWQ)
Drainage Area Number:-_ DA #3
/eTi 1. ~`9V ad ~~ 1/ i.~ ~ FC'~ ~ 1+1',. L F `'?~ l p
'~~ ~. ~ ~ae.~.~t:. .~~ 1~ u~~y~, ~i:i ~~...~,. li~~~'~~a~y~7E_~=':=s~ ~`~~:~~~~G~11'4~.`i~;
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 fn 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.
The wet detention basin system is defined as the wet detention:basin,
pretreatment including forebays and the vegetated filter if one is provided.
"dais system (check one):
^ does ~ does no# incorporate ~ vegetated filter at the outlet.
"~,h~s s~s~ein (check one):
^ does does not incorporate pretreat~rent otl'er than a farebay.
Important maintenance. procedures:.
- Immediately after the wet detention. basin is established, l~u~dscapiz~~ plants #~
should be watered twice
weekly if needed,: until the plants become established (commonly six weeks).
- No portion of the wet detention pond should be fertilized after the first initial
fertilization that is required to establish thee. lands~api~~ig plants ^~ +~,^ <,^n„+~+^,a
shelf.
- Stable groundcover should be maintained in the drainage area to reduce the
sediment load to the wet detention:basin..
- If the basin must be drained for an emergency or to perform maintenance, the
flushing of sediment through the emergency drain should be minimized to the
maximum extent practical.
- Once a year, a dam safety expert should inspect the embankment.
After. the wet detention pond is established, it should be inspected once a month and
within 2~ hours after every storm event greater than 1.0 inches (or 1.5 inches if in a
Coastal County).: Records of inspection and maintenance should be kept in a known set
location and must be available upon request.
Inspection activities shall be performed as follows.: Any. problems that are found shall
be repaired immediately..
BMP element: Potential xoblern; rIow I will rernediate the roblem:
The .entire ~PV1P Trash/debris is present.. Remove the trash/debris.
The perimeter of the wet Areas of bare soil and/or Regrade the soil if necessary to
detention basin 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 a lication.
Form SW4b1-Wet Detention Basin I&M-Rev.2

Permit Number:
(to be provided by DWQ)
Drainage Area Number: DA #3
Vegetation is too short or too Maintain vegetation at a height of
lon _ a raximatel six inches.
>;MI' element: Potential roblem: How I will remedate the roblem:
The inlet device: pipe or The pipe is clogged. Unclog the pipe. Dispose of the
Swale sediment off-site.
The pipe is cracked or Replace the pipe.
otherwise dams ed.
Erosion is occurring in t11e Regrade the swa12 if:necessary to
swale. smooth it over. and provide erosion
control devices such as reinforced
turf matting or riprap to avoid
future roblems with erosion.
1'he forebay Sediment has accumulated to Search for the source of the
a depth greater than the. sediment and remedy the problem if
original design depth fore. possible. Remove the sediment and.
sedimentstorage: dispose of it in a location where it
will. not cause impacts to streams or
the BMP.
Erosion has occurred. Provide additional erosion
protection such as reinforced turf.
matting or riprap ifneeded t°
revent future erosion roblems:
Weeds are present. Remove the weeds,.preferably by
hand: If pesticide is used, wipe it on
the plants rather than spra in .
The ~°~~_}~'-^a ch='_f Sest professional practices Prune :according to best professional
axasl cape u- ~ - ' " : n show thatpruning 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 done-time
fextilizer application to establish the
ground cover if a soil. test indicates
it is necessar
Weeds are present.: Remove the weeds, preferably by
hand. If pesticide is :used, wipe it on
the lants rather .than s ra in .
The main treatment area $ediment has accumulated to Search for the source of the
a depth greater than the. sediment and remedy the problem if
.original design sediment possible. Remove the sediment and
storage depth, dispose of it in a location where it
will not cause impacts to streams or
the BMP.
Algal growth covers over Consult aprofessianal to remove
50% of the area. and control the al al rowth.
Cattails, phragmites or other Remove the plants. by wiping theme.
invasive. plants cover 50% of with pesticide (do not spray).
the basin surface:
Form SW401-Wet Detention Basin I&M-Rev.2

Permit Number:
(to be provided by DWQ)
Drainage Area Number: DA #3
B ~ element: Potential roblem: How l will remedate the roblernc
The embankment Shrubs have started to grow Remove shrubs immediately.
on the embankment.
Evidence of muskrat or Use traps to remove muskrats and
beaver activity is .present: consult. a professional to remove
beavers.
A tree has started to grow. on Consult a dam safety specialist to
the embankment. remove the tree.
An annual inspection by an Make all needed repairs.
appropriate professional
shows that the embankment
needs. re air.
The outlet. device Clogging has occurred. Clean out thee. outlet device. Dispose
of the sediment off-site.
The outlef device: is dama ed Re air or re lace the outlet device:
The receiving water Erosion or other signs of Contact the local NC Division of
damage have occurred at the Water Quality Regional Office, or
outlet. the 4Q1 Oversight Unit at 919-733-
1786.
The measuring device used to determine the sediment elevation shall be such
that it will give an accurate depth :reading and not readily penetrate into
accumulated sediments.
When the permanent pool depth reads 8~0 feet in the main pond, the sediment
shall be removed.
When the permanent pool depth reads 1.0 feet in the forebay, the sediment
shall be removed:.
~tl in the bunks)
0 Permanent Pool Elevation 189A
Sediment R moval E1. 189.0 ~ erman t Pool
- - - - - - - - - - - - - ~' - - Volume Sediment Removal Elevation 181:0 Volume
Bottom levation 18.7.0 f 1-ft Min.. -
~,y .Sediment Bottom Elevation 180.Q 1-ft n.
Storage Sediment
Storage
corm SW4Q1-Wet Detention Basin I&M-Rev.2

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: Taft Woads East, Level Spreader Design
BMP drainage area number: DA #3
Print name: Lauraleen, LLC clo George Schlecht
Title:. Mana~.er
Address: 3515 Queen Anne Court, Clanton, NC 25727
Phone: (919 427-$Q56 _
Signature: _-~''" t~`
Date: f - ~) ®~
NOte: The legallyresponsible 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, ~ c~. ~ • L~ 11 nc~ . , a Notary Public for the. state of
O Y~~ ~C N~County of ~B~pS'~t~~ , do hereby certify that.
l' Sch! ~.c. s
C~ ~e0 ~ _,, . ~'~` personally appeared before me this
day of ~ J ~.~,ia.~-?~~r' v ~ ~ ,and acknowledge the due execution of he
forgoing wet detention basin maintenance requirements. Witness my hand and official
seal, ,~ ~ ° •
~%r
.••
~ p~
~ ~
G+~ ~~ ,~,
~ `~
d. z.
~,~
" ' ~I11111110
SEAL
My cdmmission expires act, - 0 ;~ -~ ~.Dt~
Form SW401=Wet Detention Basin I&M-Rev.2

Permit Number:
(ta be provided by D&I'Q
Drainage Area. Number. DA #4
Iii L I I. .. ~.l - ~ .~ ~ .. _. T S, ~ _.
_ ~, ~ _
I will keep a maintenance record on this B ' .This maintenance record will be kept in a
log in a known set location. Any deficient B elements noted in the inspection will be
corrected, repaired or replaced immediately. These deficiencies can affect the integrity
of structures, safely of the public, and the removal :efficiency of the BMI'.
Important maintenance procedures:
- Immediately after the filter strip is established, any newly planted vegetation
will be watered twice weekly if needed until the plants become established
(commonly. sip weeks).
- Once. a year, the filter strip will be reseeded to maintain a dense growth of
vegetation
- Stable groundcaver will be maintained in the drainage area to reduce the
sediment load to the vegetation.
- Two to three times a year, grass filter strips. will be mowed and thee. clippings
harvested to promote the growth of .thick vegetation `th optimum ..pollutant
removal efficiency. Turf grass should not be cut shorter than 3 to 5 inches and
maybe allowed to grow as tall as i2 inches depending on aesthetic requirements
(hTIPC,1993). Farested filter strips do not require this type of maintenance.
- Once a year, thee. soil will be aerated if necessary.
- Once a year, soil pH will be tested and lime wall be added if necessary.
After. the filter strip is established, ifwill be inspected _ <. ~~ ~ ~ ~ :% ~ _. °:~ ~ s
Records of inspection and rna~~itenance will be kept in a known set location and will be
available upon xequest.
Inspection activities shall be performed as follows. Any problems that are :found shall
be repaired immediately.
~'lvit' element: Potential roblem: F~oi~ ~ ~,~~iil remediate the xoblemt
~'h~ entire filter strip Trash/debris is present.. Remove the trash/debris.
s~yS~~r~
's'he flow splatter device The flow sputter device is Unclog the conveyance and dispose
(i:" ~..~plicable; clo ed. of an sediment off-site.
Thee. flow splatter device is 'lwiake any necessary. repairs or
damaged. replace if damage is too large for
re air.
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer lc~clvl-Rev.2 Page 1 of 3

>~,dt' element: PotAntial roblem: ~-~~~^a t ~-gill remediate the xoblena:
~'i:e ~~s:.ie and the level The Swale is dogged with Remove the sediment and dispose.
iip sediment. of it off-site.
The level lip is cracked, Repair or replace lip,
settled, undercut, eroded. or
otherwise darns ed.
There is erosion around the Regrade the soil to create a berm
end of the level spreader that that is higher than the levellip, and
shows stormwater has then plant a ground cover and
bypassed it. water until it is established.: Provide
lime and aone-time fertilizer
a lication.
Trees ox shrubs. have begun Remove them..
to grow on the Swale or just
downsla e of the level li .
The b;~wass channel Areas of bare soil and/or Regrade the soil if necessary to
erosive gullies have formed. remove the gully, and then
reestablish ro er erosion control.
Turf reinforcement is Study the site to see if a largex
damaged or ripap is rolling bypass channel is needed (enlarge if
downhill.. necessary).. After this, reestablish
the erosion control material.
'The filter strip Grass is toa short or tao long vTaintain grass at a height of
if a licable . a roxmatel three: to six inches.
Areas of bare soil and/or Regrade the soil if necessary to
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 a Iication.
Sediment is building up on Remove the sediment and
the filter strip. restabilize the soil with vegetation if
necessary. Provide lime and cone-
time fertilizer a lication.
Plants are desiccated. Provide additional irrigation and.
fertilizer as needed.
Plants are dead, diseased or Determine the source of the
dying. problem. soils, hydrology, disease,
etc. Remedy the problem and
replace plants. Provide none-time..
fertilizer a lication.
Nuisance vegetation is Remove vegetation. by hand if
choking out desirable species. possible. R pesticide is used, do not
allow it to get into the receiving
water,
'The receiving water Erosion or other signs of Cantact the NC Division of Water
damage have occurred at the Quality local.Regional Office, or the
outlet. 401 Oversi ht Unit at 919-733-1786.
Form S~,T1J401-Level Spreader, Filter Strip, Restored Riparian Buffer 1&~1-Rev.2 Page 2 of 3

Permit Number:
(to be provided by DT~'Q)
1 acl~nowledge and agree by my signature below that 1 am respansible for the
performance of the maintenance procedures listed above. _1 agree to nati~ ~~ ~:'. ,, of any.
problems. with thee. system or prior to any changes to the system or responsi ale parry.
Project name: Taft Woods East, Level Spreader Uesi~~zn
BMP drainage area number: DA #4
Print name; Lauraleen, LLC c/o George Schle~ht
Title: ~vlana er
Address; 3515 '(queen Anne Court, Clayton, l`1C 25'27
Phone: (913) X27-056
Signature• _-~~ .~--_
Date: / ~:'~ g~~
Note: The legally responsible party.should not be a homeowners association unless more than 50°f®of
the tots have been sold and a resident of the subdivision has been named the president.
I, _ ; t ~ -=5. _~ /f ~ ,~~ Yl , a ~?otary Public for the State of
_ l~ ~z,..`, r d~ _~~ c~x ~~ County of ~~ 1 ~ ,°.~~.1~,5. ~ ' ~_, do hereby certi;y that
~%~~,. ~(~`~ ~,'1t,1 ~ personally appeared befare me this ~~
day af'?.f.~ ^, ~t ~°~ , r~'~ ~`.~ and acl~nnowledge the due e:~ecution of the
:forgoing. filter strip, riparian buffer, and/or level spreader maintenance requirements.
~+litness my hand. and official seal,
SEAL
~ G01111111SS1©n eXpireS ~°i ~~~ r~~~•~ ;~ ,~
_~`" ,~ -
Form S~UU4n1-Level Spreader, Filter Strip, Restpred Riparian Buffer I~ivl-Rev.2 Page3 of 3

Permit ~Ttzmber:
(Io be provided b3' DWG
Drainage Area Number: DA #S
_ . _
l willkeep a maintenance record on this BIv1P. This maintenance record will be kept in a
log in a known set location. Any deficient B elements noted in the inspection will be
corrected, .repaired. or replaced , ediately: These deficiencies can affect the integrity
of structures, safety of the public, and he removal efficiency of the B
Important maintenance procedures:
Immediately after the filter strip is established, any newly planted .vegetation
will be watered twice weekly if needed until the plants:become established
(commonly six weeks).
- Once. a year, the filter strip will be reseeded to maintain a dense growth of
vegetation
- Stable groundcover will be maintained in the drainage area to reduce the
sediment load to the vegetation.
- Two to three times a year, grass filter strips. will be mowed and the clippings
harvested to promote the growth of thick vegetation with optimum polltatant
removal efficiency. Turf grass should not be cut shorter than 3 to 5 inches and
maybe allowed to grow as tall as 12 inches depending on aesthetic requirements
(ItTIPC,1993). Forested filter strips do not require this type of maintenance.
- Once. a year, the soil will be aerated if necessary.
Once a year, soil pH wi11 be tested and lime will be added if necessary:.
After the filter strip is established, it ,rill be inspected _:~. _°~°~ ;_ ' ~ _ : ~s
:Records of.inspection and ur«intenance ~~~iil be 'ept in a nno~;~ii ;yet l~~catiort and will be
available upon request..
Inspeclaon activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
~?i=~~€' ~l~~~tent: T'otential roblem =~o,,z T ~vili remediate the roblern:
't'he entire filter strip Trash/debris is present.. Remove the trash/debris.
s°;~stnrr:
'~':~~ ilog,~ sputter devise 'The.flow sputter device is Unclog the conveyance and dispose
(i e, r',plicablej clo ed. of an sediment off-site.
The:flow sputter device is Make any necessary repairs or
damaged,. replace if damage is too large for
re air.
Form S~IU401-Level Spreader, Filter Strip, Restored Riparian Buffer I~;~vi-Rev.2 Page 1 of 3

~3 ~~ _ ~" element: Potential roblem: T°~ c. ~ ` ~ -rill remediate the roblein:
'r;~e Swale and the level The swale is clogged with Remove the sediment and dispose
lilro sediment. of it off-site.
The .level lip is cracked, Repair or replace lip..
settled, undercut, eroded. or
otherwise dama ed.
There is erosion around the Regrade the soil to create a berm
end of the level spreader hat that is higher than the level. lip, and
shows stormwater has then plant a ground cover and
bypassed it. water until it is established. Provide
lime and a ane-time fertilizer
a lication.
Trees or shrubs. have begun Remove them.
togrow on the Swale or just
downslo e of the level li .
Thy bypass channel Areas of bare soil and/or Regrade the sail if necessary to
erosive gullies have formed. remove the gully, and then
reestablish ro er erosion control.
Turf reinforcement is Study the site to see if a larger
damaged or ripap is rolling bypass Channel is needed (enlarge if
downhill. necessary).. After this, reestablish
the erosion control material.
The filter. strip Grass is too short or too long wiaintain grass at a height of
if a licable . a roximatel three to six inches.
Areas of bare soil and/or Regrade the soil if necessary to
erosive gullies have formed. remove the gully, and then. plant a
ground cover and water until it is
established. Providelime and a
one-time fertilizer a licaton.
Sediment is building up on Remove the sediment and
the filter strip. restabilize the soil with vegetation if
necessary. Provide lime and aone-
time. fertilizer a lication.
Plants are desiccated. Provide additional irrigation and
fertilizer asneeded.
Plants axe dead, diseased or Determine the source of fine
dying. problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants.. Provide aone-time
fertilizer a lication.
Nuisance vegetation is Remove vegetation by hand if
choking out desirable species. possible. If pesticide is used, do not
allow it to get into the receiving
water.
The receiving water Erosion or other signs of Contact the NC Division of Water
damage have occurred at the Quality local Regional Office, or the
nutlet. 401 Oversi ht Unit at 919-733-1786.
Form SWiJ401-Level Spreader, Filter Strip, Restored Riparian Buffer I~~'~1-Rev.2 Page 2 of 3

Permit h?umber:
(to be provided by Dl:'Q)
I acknowledge and agree by my signature below that I am responsible for the
performance of the maintenance proeedures listed above. 1 agree to notify ~~a,r~ of any
problems with the system or przor to any changes to the system or responsible party,
Project name Taft Woods East, Level Spreader L~esi~n
Bl/IP drainage area number: DA #5
Frint name: Lauraleen LL,C c/o Georae Schlecht
Title: IiVlana~-er
Address: 3515 Queen Anne Court, Clayton, NC 25727
Fhone: (919) 427-056
Signature: l ~~- ~ ,..-f'°~~, ~--~' °``
Date: s ~`/,~ ~~ 7
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, , ; r ~l1 ~ r~~'1 , a Notary public for the State of
~~~(_;_ ~~~~,~ ,, County of ~n r.~ ,~~' F~, , do hereby certify that
(~ ~-~~ PLC ~ ~ personally appeared before me this
day of ~~:;~, ': ~'-,~^ ' , ,'?; ~ ~ and acknowledge the due execution of the.
forgoing filter strip, riparian buffer, and/or level spreader maintenance xequrements.
Witness my hand and official. seal,

Permit Number:
(to be provided by 1~.WQ)
Drainage Area Number: DA #6
I will keep a maintenance record on this Bivt"I'. This maintenance record will be kept in a
log in a known set location. Any deficient BIViP 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 remaval efficiency of the Bi~IP.
Important maintenance. procedures:
- Immediately after the filter strip is established, .any newly planted vegetation
will be watered Twice weekly if needed until the plants become established
(commonly six weeks).
Once a year, thee. filter strip will be reseeded to maintain a dense growth of
vegetation
- Stable groundcover will. be maintained in the drainage area to reduce the
sediment load to the vegetation.
- Two to three times a year, grass filter strips will be mowed and the clippings
harvested to promote the growth of thickvegetationtth optimum pollutant
removal efficienc3r. Turf grass should not be cut shorter than 3 to 5 inches. and
maybe allawed to grow as tall as 12 inches. depending on aesthetic. requirements
('~TIPC,1993}. Forested filter. strips do not require this. type of maintenance:.
- Once a year, the soil will be aerated if necessary.
- Once a year, soil pH will be tested and lime wi~l be added if necessary.
.After. the filter strip is established, it will be inspected : ~ ~ ~
} *a--. ~ c a s? a , _ _ ~ .i'~ ~ ,~, i ' ~ ~. ~ ~i' l!,... .. ,xa ~ _ ~ ~ i ~..
. `. ..
Records of inspection anu maintenance will be kept in ~ kno~~~~, set location and will be
available open request.
Inspection.activities shall be performed as follows.: Any problems that are found shall
be repaired immediately.
~$i"~°~ el~rnent: Potential noble I~ow will remediatp the roblem:
'~'hc :~5itire filtprstrip Trash/debris is present.: Remove the rash/debris.
gss5t~'Td
`t'he E'i~`-~~ splitte~° .~e~d~e The flow sputter device is Unclog the conveyance and dispose
(ii ~~ ~~~lcal~ ~e) clo ed. of an sediment off-site.
The flow splitter :device is '1Vlake any necessary. repairs or
damaged.. replace if damage is too large for
re au,.
Forth SWU4Q1-Level Spreader, Fitter Strip, Restated Riparian Buffer I&~I-Rev.2 Page 1 of3

E~~~:~a 33 element: ~~ote~iHal reblem: ow 1 will remediat~ the problem:
'f;he s~~:~ale and the level The Swale is clogged with. Remove the sediment and dispose.
!i}, sediment. of it off-site.
The evel lip is craeked, Repair or replace lip.
settled, undercut, eroded or
otherwise dama ed.
There is erosion around he Regrade the soil to create a berm
end of thellevel spreader that that is higher.than the level Iip, and
shows stormwater has thenplant a ground cover and
bypassed it. water until it is established. Provide
lime and aone-time fertilizer
a lication.
Trees or shrubs have begun Remove them.
to grow onthe Swale or just
downslo e of the level li .
The bypass channel Areas of bare soil and/ar Regrade the soil if necessary to
erosive gullies have formed. remove the gully, and then
reestablish ro er erosion.control.
Turf reinforcement is Study the site to see if a larger
damaged or ripap is rolling bypass channel as needed (enlarge. if
downhiII. necessary). Afterths, reestablish
the erosion control material.
The filter strip Grass is too short or too long vlaintain grass at a height of
if a livable . a roximatel three to six inches.
Areas of bare soil and/or Regrade the soil if necessary to
erosive gullies have formed. remove the gu11Y, and thenplant a
ground cover and water until it is
established. Provide lime and a
one-time fertilizer a licaton.
Sediment is building up on Remove the sediment and
the filter strip. restabilize the soil with vegetation if
necessary. Provide lime and aone-
time ferfilizer a lication.
Plants axe desiccated. Provide additional irrigation and
fertilizer as.needed.
Plants are dead, diseased or Determine the source of the
dying. problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants. Provide. acne-time
fertilizer a lication.
l~iuisance vegetation is Remove vegetation by hand if
choking out desirable species.. possible. If pesticide is used, do not
allow it to get into the receiving
water.
ThQ receidng water Erosion ox other. signs of Contact the. NC Division of Water
damage have occurred at the Quality local :Regional Offiee, or the
outlet. 401 Clversi ht Unit at 919-733-1786.
Form SWtJ401-Level Spreader, Filter. Strip, Restored Riparian Buffer I&1~1-Rev.2 Page 2 Of 3

Permit Number:
(to be pravi~led by D ~Q)
acl~nowledge and agree by my signature below that I am responsible for the
perfarmance of thee. mante ee'procedures listed above. I agree to notify ~~ ~-' ~ of any
problems v~ith the system or prior to any changes to the system ar responsible party.
Project name: Taft loads East,: Level Spreader Design.
BMP drainage area number: IAA #6
Print name: Lauraleen, LLC c/o ~'eorg_e Schlecht
Title: Cana er
Address: 3515 Queen Anne Caurt~ Clanton, ITC 25727
Phone: 919 427-$056
.Signature:
Date: .~~ ~~ ~ '7
i~3ote: The legally responsible party should not be a homeowners. association unless more than ~0% of
the lots have been scald and a resident of the subdivision has been named the president.
1, r~ r'~' ~. ~/~~.~ ~,~ ~~ , a i'~otary I~ublc for the State of
_ ~ ~,
~r~ >~.~.' ~, ~.''i~L %~°3? , "'ounty of ~~ ~~2;~ ~1e>; `~ , clo hereby certify that
~`,~~ ~ ~('.,~ l ~ch~ personally appeared before. me this _ ~ . ~"=~a
..~
day of~q'C ~~ ~."~t~ ~ ~' ~Q1`? ,and acknowledge the due execution of the
forgoing filter strip, riparian buffer, and/or level spreader maintenance requirements.
~~~itness my hand and official seal,
SEAL
~iy commission expires ~~~-t~ ~~~
Form SWLJ401-Level. Spreader, Filter Strip, Restored Riparian Buffer Ic4cNl-Rev.2 Page. 3 of 3

Permit ?umber:
(to be provided by DF~Q~
Drainage Area.Number: DA #7
lip `~ sw ~ - ~ . ~ ~ i r'~ ~~ ~
.. 1 _ ~
I will. keep a maintenance record on this BIViP, This maintenance record will be kept in a
log in a known set location. Any deficient Boil' elements. noted in thee. inspection will be
corrected, repaired or replaced. immediately, These deficeneies can affect the integrity
of structures, safety of the public, and the removal efficiency of the B~iP.
Important maintenance procedures:
- Immediately after. the filter strip is established, any newly planted vegetation
will be watered. twice weekly if needed until the plants became established
(commonly six weeks).
- Once. a year, the filter strip will be reseeded to maintain a dense growth of
vegetation
- Stable groundcover will be maintained in the drainage area to reduce the
sediment load to the vegetation.
- Two to three times a year, grass filter strips will be mowed and the clippings
harvested to promote the growth of thick vegetation with optimlam pollb.tant
removal efficiency. Turf grass should not be cut sJhorter than 3 to 5 inches. and
may. be allowed fio grow as .tall as 22 inches depending on aesthetic reglurements
(h.TIPC,1993). Forested filter strips cio not require this type of maintenance.
- Once a year, the soil will be aerated if necessary.
- Once a year, soil pH will be tested and lime will be added if necessary:.
After the filter strip is established, it will be inspected ~, -_ ~ ~ ~ , ` -~ -' • '~ _,~~:4 fl .•s
s _t ! ° ~ .~ ~~. ~.~. sa^ _ t.,. ;~ :r ;~..~ i.k, ,~ ~( ." gym;; ~u1' -'b e.,~'.! ~~a!'3 ~~~~7 ~f.~;~~~,
Records of inspec*ion .au'_ maint~~~ lance wrtl ~~~ kept in a kno 4vn set location and will be
available upon regi~e~ t.
Inspection activities shall. be performed as follows. Any prablems that are found shall
be repaired immediately.
~~i~-~'~~ element: Potential roble ~~o:, " ~n~ill remediate the problem:
'~~he r~altire filter strip Trash/debris is present. Remove the trash/debris.
s~~ste~;i
Thy ~ 1 ~ .~ sl: a i, aer ~ c~~ice The flow sputter device is Unclog the conveyance and dispose
cif a ~,plicable) clo ed. of an sediment off-site.
The :flow sputter device is Make any necessary repairs or
damaged.. replace if damage is too large for
re air.
Form S~IJ401-Level Sprear3er, FilterStrip, Restored Riparian Buffer Ic4cil~i-Rev.2 Page l of 3

>i~-~ ~' element: i'cle.~~~ial roblem: flow will remecliate the roblern:
'1 h~ s~>> a le and .~ ~ ~ iwel The swale is clogged with Remove the sediment and dispose
lip sediment.. of it off: site.
The level lip is cracked, Repair or replace lip.
settled, undercut, eroded or
otherwise dame ed.
There is erosion around the Regrade the soil to create a berm
end of the level spreader that that is higherthan the level lip, and
shows stormwater has then plant a ground cover and
bypassed. it. water until it is established. Provide
lime and aone-time fertilizer
a lication.
Trees or shrubs have begun Remove them.:
to grow on the swats or just
downslo a of the level li .
The bypass channel Areas of bare soil and/or Regrade the soil if necessary. to
erosive gullies have formed. remove the gully, and then
reestablish ro er erosion control.
Turf reinforcement is Study the site to see if a larger
damaged or ripap is rolling bypass channel is needed (enlarge if
downhill.. necessary). After this, reestablish.
the erosion control material.
The filter strap Grass is too short or too 1®ng ~Taintain grass at a height of
if a Iicable . a roximatel three to six inches.
Areas of bare soil and/ or Regrade the soil if necessary to
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 a lication.
Sediment is building up on Remove the sediment and
the filter strip. restablize the soil with vegetation if
necessary. Provide lime and a one-
tune fertilizer a lication.
Plants are desiccated. Provide additional irrigation and
fertilizer as needed.
Plants are dead, diseased. or Determine the source of the
dying. problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants.. Provide aone-time
fertilizer a _ lication.
Nuisance vegetation is Remove vegetation by hand if
choking out desirable species. possible. If pesticide is used, do not
allow it to get into the receiving
water.
'a he receiving water Erosion or other.signs of Contact the NC Division of Water
damage have occurred at the Quality local Regional dffice, or the
outlet. 401 Oversi ht Unit a# 919-733-1786.
Form e5WLT401-Level Spreader, Filter:Strip, Restored Riparian Buffer 1~~~1-i~ev.2 Page 2 Of 3

Permit dumber:
(to be provided by DWQ)
I ackno`vledge and agree by my signature below that I am responsible for the
performance. of the. maintenance procedures listed ~:bove. I agree to notify ~W~ of any.
problems with thee. system or prior to any changes to the.system or responsible party.
Project Warne: Taft Woods East, Level Stareader Design
B111P drainage area number: Dpi. #7
Print name: Lauraieen, LI,C c/o Geor, eg_Schlecht
Title:lVlana~er
Address: 35.15 (queen Anne Court, Clanton, NC 25727
Phone: [phone]
Signature: ~~``
Date: ~ ~~~ „~ ~ ~
Note: The legally responsible party should not be a homeowners association unless more than SO% of
the lots have been sold and a resident of the subdivision has ibeen named the president.
1, - s S . - ~"/!- ~. ~` 1° ~ , a Notary .Public for the State of
` j
~~~.~~;~~''~ ~~,, ~l? ~Z:l~t ~ ~., County of ~~ i~ 1~, ~~ ~ , do hereby certify that
z ~~1? ~~''.!~ 1' C 9 a i' personally appeared before me this: 'r~A. a
day of~.~'~ g~,, '~, and acknowledge the due execution bf the
forgoing filter strip, riparian buffer,:and/or level spreader rnaintenanee requirements.
Witness my hand. and official seal,
a~,tiL
My commission expires L ~,'tt v ~ D/
Form SWU401-LeveLSpreader, Filter Strip, Restored Riparian Buffer I&i~i-Rev.2 Page 3 of 3

ATTACHMENT IU
RIPARIAN BUFFER AUTHORIZATION PRE-CONSTRUCTION NOTICE

:'4C~'SSin~
1. Check all of the approval(s) requested for this,project:
Section 404 Permit ~ Riparian or:Watershed:Buffer Rules
Section 10 Permit ^ Isolated Wetland Permit from DWQ
401 Water Quality Certification ^ Express 401 Water Quality Certification
2. Nationwide, Regional or General Permit Numbers} Requested: NOA
3. If this notification is solely a courtesy copy because written. approval for the .401 Certification
is not required, check here:
4. If payment into the :North. Carolina Ecosystem Enhancement Program (NCEEP) is proposed
for mitigation of impacts, attach the acceptance letter from NCEEP, complete section VIII,
and check here: ^
5. If your. project is located in any of North Carolina's. twenty coastal counties (listed on page
4) and the project. is within a North Carolina Division of Coastal Management Area of
Environmental:Concern (see the top of page 2 for further. details), check here:
LE.. [-~.~r?~E IC~$I11i ~~~9~ti~}f~1E,~i~~:~~ :: :: :: :: :: :: :: :: :: :: :: ::
1. Owner/Applicant Information
Name:. Lauraleen LLC~Attn: George Schlecht)
Mailing Address: 3515 Queen Ann Drive
Clayton N.C. 27527...
Telephone Number:: 919-427-8056 Fax. Number: 919-553-9196
E-mail Address: N!A
2. Agent/Consultant Information (A signed and dated copy. of thee. Agent Authorization letter
must be attached if the Agent has signatory authority. for thee. owner/applicant.)
Name: Rebecca Peterson PE
Company Affiliation: Soil & Environmental Consultants PA
Mailing Address: 11010 Raven Ride Road
Raleigh, NC 27614
Telephone Number:~919~846-5900 Fax:Number: (919 846-9467..:.
E-mail Address; RPeterson(cr~SandEC.com
Page l of 9

IO,~~C "~
Attach a v i e r na ~ ~::; ~ ~ ~ ~~p clearly showing the location. of the property with respect to local
landmarks such as towns, rivers, and roads. Also provide a detailed sI ; e ~~1 s~ ~~ showing. property
boundaries and .development .plans in relation to surrounding properties. Both the vicinity map
and site plan must include a scale and north arrow. The specific footprints of all buildings,
impervious surfaces, or other facilities must be included. If possible,: the maps and plans. should
include the appropriate USGS Topographic Quad Map and NRCS Soil Survey with thee. property
boundaries outlined. Plan drawings, or other maps. maybe included at the applicant's discretion,
so long as the property is clearly defined. Fore. administrative and distribution .purposes, the
USACE requires information to be submitted on sheets no .larger than l l by 17-inch format;
however, DWQ .may accept paperwork of any size. DWQ prefers full-size construction
drawings rather than a sequential .sheet version of the full-size plans.. If full-size plans are
reduced to a small scale. such that the final version is illegible, the applicant will be informed that
he project has been placed on hold until decipherable maps are provided.
1. Name of project: Taftwoods East-Section 2
2. T.LP. Project Number or State Project Number (NCDOT Only): N/A
3. Property Identification Number (Tax PIN): 1689-73-8518 & 1689-94-4588
4. Location
County: Johnston Nearest Town:. Flowers
Subdivision. name (include phase/lot number): Taftwoods East:-Section 2
Directions to site (include road numbers, landmarks, etc.): The site is located north of
Motorcycle Road (S.R. 1704) and is approximately 1,000 .feet northwest of the intersection of
Motorcycle Road and Highway 42 in Flowers N,C.
5. Site coordinates, if available (UTM or Lat/Long): 35.6556° N, 78:.3648° W
(Note - If project is linear, such as a road or utility line, attach a sheet that separately lists the
coordinates for each crossing of a distinct waterbody.)
6. Property. size (acres): ~ 126 acres (project area ~ 83 acres)
7. Nearest body of water (stream/river/sound/ocean/lake): UT to Mill Creek
8. River Basin: Neuse (03-04-02 27-39 WS-IV NSW)
.(Note -this must be one of North Carolina's seventeen designated major river basins. The
River Basin. map is available at htt~:f/h2o enr state.ne.us/adnlitymaps/.)
9. Describe the existing conditions on the site and general land use in the vicinity of the project
at the time of this application: A majority of the site is currently wooded and undeveloped,
with exception to the "Existing Section One" area on the southwest portion of the site.
Page 2 of 9

110. Describe the overall project in detail, including the type of equipment to be used: The
proposed project is a residential development. Riparian buffer impacts will be the result of 6
buss channels associated with level spreaders
1 L Explain the purpose of thee. proposed work: The purpose of the residential subdivision is to
provide needed housing to meet the owing demands for this area. The.purpose of the level
treaders is to provide diffuse flow far stormwater that has been concentrated as a result of
the development Riparian buffer authorizations will be necessary for bypass channels on 5
of the 7 proposed level spreaders
~k7 ~~1~t1J1' i.~YL~~C9 ~~~St'~E'~,'
If jurisdictional determinations and/or permits have been requested and/or obtained for this
project (including all prior phases of the same subdivision) in the past, please explain. Include
the USACE Action ID :Number, DWQ Project Number, application date, and date permits and
certifications were issued or withdrawn. Provide photocopies of previously issued. permits,
certifications or .other .useful information. Describe previously approved wetland, stream and
buffer impacts, along with associated mitigation {where. applicable). If this is a NCDOT project,
list and describe permits issued fore. prior segments. of the same T.LP. project, along with
construction schedules. A 401 Water Quality Certification was issued b~Q on October 15,
2007 permitting 2581inear feet of perennial stream impacts 11 686 square feet of Zone 2 Neuse
buffer impacts and 7374 square feet of Zone 1 Neuse buffer imyacts. NCEEP issued an
acceptance letter to receive payrnent for compensatory mitigation for the 258 linear feet of
perennial stream impacts. On October 1 2007 S&EC requested. authorization from the US
Army Corpse of Engineers USACE) to utilize a Nationwide Permit 29 for the above referenced
stream impacts A Notification of Statutory Status for this request was submitted to the USACE
on November 20 2007 Photocopies of all issued permits and other useful information are
attached.
Are any future permit requests. anticipated for thisproject? If so, describe the anticipated work,
and provide justification for thee. exclusion of this work from the current application.
There are not future permits known to be required at this time.
~~. Jz';~r:~US~4i ~~Y~~~s~dd3 ~~o "~;~iDfi~e•S tl~ ,:':' ~~illiK~'!~ tiSi~SiitBg'S ~ii'~~?~' '~~1~y
It is the applicant`s (or agent's) responsibility to determine, delineate and map all impacts to
wetlands, open water, and stream channels associated with the project. Each impact must be
listed separately in thee. tables below (e.g., culvert installation should be listed separately from
riprap dissipater pads). Be sure to indicate if an impact is temporary. All proposed :impacts,
permanent and temporary, must be listed, and must be labeled and clearly identifiable on an
accompanying site plan. All wetlands and waters, and all streams. (intermittent and perennial)
should be shown on a delineation map, whether or not impacts are proposed to these. systems.
Wetland and stream evaluation and delineation forms should be included as appropriate.
Photographs. maybe included at the applicant's discretion. If this proposed impact is strictly for
Page 3 of 9

wetland or stream mitigation, list and describe the impact in Section VIIT below, If additional
space. is needed for listing or description, please attach a separate sheet.
1. Provide a written description of the proposed impacts: There are no proposed impacts to
jurisdictional waters within this a~,plication request
2. Individually list wetland impacts. Types of impacts include, butt are .not limited to
mechanized clearing, grading, fill, excavation,: flooding, dtching/drainage, etc. For dams,
se arately list. impacts due to both structure and flooding.
Wetland Impact Type of Wetland Located within Distance to Area of
Site Number Type of Impact (e.g., forested, marsh, 100-year
Floodplain Nearest
Stream Impact
(acres)
(indicate on map) herbaceous, bog, etc.) (yes/no) _ (linear feet)
N/A N/A N/A NIA N/A N/A

Total Wetland Impact (acres) N/A
3. List the total acreage. {estimated) of all existing wetlands on the property: <1 acre
4. Individually list alT intermittent .and perennial stream :impacts. Be sure to identify temporary
impacts. Stream impacts include, but are not limited to placement of fill or culverts, dam
construction, flooding, relocation, stabilization activities. (e.g., cement walls, rip-rap, crib
walls, gabions, etc.), excavation, dtching/straightening, etc:. If stream relocation is proposed,
plans and profiles showing the linear footprint for. both the original and relocated streams
must be included. To calculate acreage,: multiply length X width, then divide by 43,560.
Stream Impact
Perennial or Average Impact Area of
Number Stream Name "type of Impact
Intermittent? Stream.Width Length Impact
(indicate on map) Before Impact (linear feet) (acres)

N/A NfA N/A N/A N/A N1A N/A
Total Stream Impact (by length and acreage) N/A
5. Individually list all apen water. impacts (including lakes, ponds, estuaries, sounds, Atlantic
Ocean and any other water of the U.S.). Open water impacts include, but are not limited to
fill, excavation, dredging, flooding, drainage, bulkheads, etc.
Open Water Impact Name of Waterbody Type of Waterbady Area of
Site Number
(if applicable) Type of Impact (lake, pond, estuary, sound, bay, Impact
(indicate on map) ocean,. etc.) (acres)
n/a n/a n/a n/a n/a
Total Open Water Impact (acres}
6. .List the cumulative impact to all Waters of the U.S. resulting from the project:
Stream Impact (acres): 0
Wetland Impact (acres): 0
Open Water Impact (acres): 0
Total Impact to Waters of the U.S. {acres) 0
Total Stream Impact (linear feet): 0
Page 4 of 9

7. Isolated Waters
Do any isolated waters exist. on the property? Yes ^ No
Describe all impacts to isolated waters, and include the type of water (wetland or stream) and
the size of the proposed impact (acres or linear feet). Please. note that this section only
applies to waters that have specifically been determined to be isolated by the USACE.
There are no impacts proposed to any isolated waters onsite.
8. Pond Creation
If construction of a pond is proposed, associated wetland. and stream impacts should be
included above in the wetland and stream impact sections. Also, the proposed pond should
be described here and illustrated on any maps included with this application.
Pand to tibe created. in (check all. that apply}: ^ uplands ^ stream ^ wetlands
Describe the method of construction. (e.g., dam/embankment, excavation, installation of
draw-dawn valve or spillway, etc.}: N/A
Proposed use or purpose of pond (e.g., livestock watering,: irrigation, aesthetic, trout pond,
local stormwater requirement, etc.): N/A
Current and use in the vicinity of the pond:: N/A
Size of watershed draining to pond: N/A Expected pond surface area: N/A
~~.~t~1~. ~Y~1[~`~Cr, ~3fl'~S'VC~u~~, ~'~' (E';.YL~ti ~~F~ ~ ~ip~.i~ al~i~IL9~'TI3N~`~~-tlrilii}
Specifically describe measures taken to avoid the proposed impacts.: It maybe useful to provide
information related to site constraints such as topography, building ordinances, accessibility, and
financial viability of the project. The applicant may attach drawings. of alternative,: lower:-impact
ite layouts, and explain why these designoptions were not feasible.: Also discuss how impacts
were minimized once the desired site plan was developed. If applicable, discuss construction
techniques o be followed during construction to reduce impacts.
Six (6) of the seven (7) proposed level spreaders were designed to provide diffuse flow for
storm events up to and including the 1 in/hr intensity The current BMP manual requires a
bypass channel to convey flow resulting from intensities greater than 1 in/hr into and including
the 10-yr event to through the buffer to the stream. The bypass channel is not necessary if the _
level spreader can be deli ngned to provide diffuse flow for events up to and ncludin thg e l0-
event however none of the level spreaders could be designned for this flow without exceeding
the maximum lengths as defined. in the B1V1P Manual. one (1) level spreader could not be
designed to provide diffuse flow for the 1 in/hr intensity without exceeding the maximum length,
so a wet detention fond has been designed to capture and release stormwater to this level
spreader at the rate associated with the maximum length This pond has enou storage to store
and release the 10- r~event to the level spreader at this rate so no bypass channel is needed for
this draina eg area (#3) The level reader located inDrainage Area #2 is located 50' upslope of_
a natural swale that is not a buffered stream therefore the bypass channel will not have an~_
buffer impacts associated with it
DWQ - In accordance with 1 SA NCAC 2H .0500, mitigation may be required by the NC
Division of Water Quality far projects involving greater than or equal to one acre of impacts o
Page S of 9

freshwater .wetlands or greater than or equal to 150 linear feet of total impacts to perennial
streams.
USAGE - In accordance with the. Final Notice: of Issuance: and Modification of Nationwide
Permits, published in the Federal Register on January 15 2002, mitigation will be required when
necessary to ensure that adverse effects to thee. aquatic environment are minimal. Factors
including ize and type of proposed impact and function and relative value of the impacted
aquatic resource will be considered in determining acceptability of appropriate and practicable
mitigation as proposed. Examples of mitigation that maybe appropriate and practicable:include,
but .are not limited to:.reducng the size of the project; establishing and maintaining wetland
and/or upland vegetated buffers to protect open waters such as streams; and replacing losses. of
aquatic resource :functions and values by creating, restoring, enhancing, or preserving similar
functions and values, preferable. in the same watershed.
If mitigation is required for this protect, a copy of the mitigation plan must be attached in order
for USAGE or DWQ to consider the application complete for processing. Any application
lacking a required mitigation plan or NCEEP concurrence shall be placed on hold as incomplete.
An applicant may. also choose to review the current guidelines for stream restoration in DWQ's
Draft. Technical Guide far Stream Work in North Carolina, available at
http://h2o.enr.state.nc.us/ncwetlands/strmgide.html.
1. Provide a brief description of the proposed mitigation plan.: The description should provide
as much information as possible, including, but not united to: site location (attach directions
and/or map, if offsite), affected stream and river basin, type. and:amount (acreage/linear feet)
of mitigation. proposed (restoration, enhancement, creation, or preservation), a plan view,
preservation mechanism (e.g., deed restrictions, conservation easement,: etc.), and a
description of he current site conditions and. proposed method of construction:. Please attach
a separate sheet if more space is needed.:
Because no impacts are proposed to jurisdictional waters no stream or wetland mitigation is
proposed Additionally the riparian buffer impacts proposed are considered "allowable"
therefore no riparian buffer mitigation is proposed. Please see Section X.3 for details.
2. mtigaton may also be made by payment into the North .Carolina Ecosystem Enhancement
Program (NCEEP). Please note it is the applicant's responsibility to contact the NCEEP at
.[phone] to determine availability, and:written approval .from the NCEEP indicating
that they are .will to accept payment for the mitigation must be attached to this form. For
:additional information regarding the application process for the: NCEEP, check thee. NCEEP
website at http://h2o enratate nc us/wrp/ndex.htm. If use. of the NCEEP is proposed, please
.cheek .the appropriate. box on page five and provide the following :information:
Amount of stream mitigation requested (linear feet): n/a
Amount ofbuffer mitigation requested (square feet): n/a
Amount of Riparian wetland mitigation requested (acres): n/a
Amount ofNon-riparian wetland mitigation requested (acres): n/a
Amount of Coastal wetland mitigation requested (acres): n/a
Page 6 of 9

-~'`"+ '~ :L~". C'~~~iC~~E',L~i[~ ~r'(l~l'$211~aL[i]ii11(~~~ (li'~E~II!ui'A(~ ~y I~}~~~`i~y.?)
1. Does the project involve an expenditure of public (federal/state/local). funds or the use of
public (federal/state) land? Yes ^ No
2. If eyes, does the project require preparation of an environmental:document pursuant to the
requirements of the National or North. Carolina Environmental Policy Act (NEPA/SEPA)?
Note:. If you are not sure whether aNEPA/SEPA document is required, call the SEPA
coordinator at (919):733-:5083 to review current thresholds for environmental documentation.
Yes ^ No
3. If yes, :has the document review been: finalized by he State Clearinghouse? If so, please
attach a copy of the NEPA or SEPA final approval letter. Yes ^ No
~'E'O~OSe~~ s'~I~aiC'u;S ~lir 3.~L;lD.er~i~._~t Qx~';~~ v~".'i4~C'~'S~*w(~ ~~ ~_''~~'c'S (~ ~r~?~~.9"+ 4~ ~)~ ~~)
It is the applicant's (or :agent's) responsibility to determine, delineate and map all impacts. to
required state and local buffers associated with the project. The applicant must also provide
justification for these impacts in Section VII above. .All proposed impacts must be listed herein,
and must be clearly identifiable on the accompanying site plan. All buffers must be shown on a
map, whether or not impacts are proposed to the buffers. Correspondence from the DWQ
Regional :Office .may be included as appropriate:. Photographs may also be included at .the
applicant's discretion.
1. Will thee. project impact protected riparian buffers identified within 15A NCAC 2B .0233
(Meuse), 15A NCAC 2B .0259 (Tar-Pamlico), 15A NCAC 02B .0243 (Catawba) 15A NCAC
2B .0250 (Randleman Rules and Water Supply :Buffer Requirements), or other (please
identify. )? Yes ~XJ No ^
2. If "yes' ; identify the square feet and acreage of impact to each zone of the riparian buffers.
If buffer mitigation. is required calculate the required amount of mitigation by applying the
buffer multipliers.
Drainage Area #1
Zone* Impact (Temporary**) Multiplier. Required
square feet Mitigation
1 389 N/A N/A
2 227 (30) N/A N/A
Total 616 (30) N/A
Drainage Area #4
Zone* Impact. (Temporary**) Multiplier Required
square feet Mitigation
1 387 N/A N/A
2 83 (165) N/A NfA
Total 470 (165) N/A
Page 7 of 9

Drainage. Area #5
Zone* Impact (Temporary**) Multiplier Required
square feet Mitigatian
1 647 N/A N/A
2 l l 2 (213) N/A NIA
..Total 759 (213) N/A
Drainage Area. #6
.Zone* Impact (Temporary* ~) Multiplier Required
s uare feet Mitigation
1 851 N/A N/A
2 l01 (167) N/A N7A
Total 952 (167) N/A
Draina e Area. #7
Zone* Impact (Temporary**) Multiplier Required
s uare feet Mitigation
1 782 N/A N/A
2 188 (308) N/A N/A
Total 970 (308) N/A
Total
Zone* Impact (Temporary**) Multiplier Required
s uare feet Mitigation:
l 3056 N/A N/A
2 '711 (883) N/A N/A
Total 3767 (~83) N/A
Zone l extends out 30 feet perpendicular from the top of the near bank of channel; Zone 2 .extends an
additiona120 feet from the edge of Zone 1.
** r'es,aporary impacts will occaa~ da~rif~,~ coyastraactio~a of tlae bypass cl2a,~atzels ill areas
iapapacterl ~la~ri,~a~ constraictio;a ::will he stabilizeal aad reve~etated.
3. If buffer mitigation is required, please discuss what tyke of mitigation is proposed (i.e.,
Donation of .Property, Riparian Buffer Restoration /Enhancement, or Payment into the
Riparian Buffer Restoration Fund). Please attach all appropriate information as .identified
within 15A NCAC 2B .0242 or .0244, or .0260. Riparian buffer impacts proposed are the
result of b ayp ss channels required for level spreaders per the BMP Manual and should be
considered "allowable" therefore mitigation is not. proposed.
f .C'.it.!.'iJi# a ~C (i ~` ~1';',f~ 5y~ ~j~ • " ~>
Describe impervious acreage .(existing and proposed) versus .total acreage on the site. Discuss
stormwater controls proposed in order to protect surface waters and wetlands downstream from
the property. If percent impervious surface exceeds 20%, please provide calculations
demonstrating total proposed impervious level. The overall planned. impervious area for
Page 8 of 9

Taftwoods-Section 2 .will be less .than 15°fo, specifically 14.:6%. The project is located in
Johnston County and will have to adhere to the Johnston County Stormwater ordinances.
Additionally th~sproject is located with Watershed Water Supply IV, NSW waters and subject
to Phase IIPost-Construction requirements all DWQ delegated programs to Johnston Count.`
~~ k~. Se`s~age Disposal (~•c.~~~ ~-,•,Jf~ I!:y r `,°''~)
Clearly detail the ultimate treatment methods and disposition (non-discharge or discharge) of
wastewater generated. from the proposed project, or available capacity of the subject facility.
The project will use individual septic systems.
~~.~ x'.71©~±M~"J1?S (a'1':'~FR~~'t"e~ ~2'y ~~ra.67.~-~t
Is this site in violation of DWQ Wetland Rules (15A NCAC 2H .0500) or any Buffer Rules?
Yes ^ No
Is this an after-thee-fact permit application? Yes ^ No
c! at'..3.: 1]~~ ~~~t~~.,R Vii { ~~T yo~'~~45 (g~ii a'a''5~..,(~ 1.i/l ~.~ _!
Will this project .(based on past and reasonably .anticipated future impacts) result in additional
development, which could impact nearby downstream water quality? Yes ^ No
If yes, please submit a qualitative or quantitative. cumulative impact. analysis in accordance with
the most recent North Carolina Division of Water Quality policy posted on .our website at
http://h2o.enr.state.nc.uslncwetlands. If no, please provide a short narrative description: The
proposed project does not require a 401 Water Quality Certification or Isolated Wetlands Permit,
therefore, according to the NCDWQ Draft Internal Polioqualitative or quantitative impact
analysis should not be required..
_, 3Efl(',~' ~°.~'~.dy~°.lSa:`s~ilC~S (~.}~)~.9rgr£:~~k:
It is the applicant°s responsibility to submit thee. application sufficiently in advance of desired
construction dates to allow processing time fore. hese permits. However, an applicant may
choose to list constraints associated with construction or sequencing that may impose limits on
work schedules (e.g., draw-down schedules for lakes, dates associated with Endangered and
Threatened Species, accessibility problems, or other issues outside of he applicant's control).
n/a
~')
r
-- ~ _ _
f , 4C' ~.~ ~i f ~' z', ii ~ a.~L-'d ` :',,: ~ ~ ~ s V ~ ~ ? ~! i d !, a , '' ~' ~'' it ~ ~
(Agent's signature is valid only if an authorization letter from the applicant is provided.)
Page 9 of 9

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~®~ ~1 A ~F,,gQ Michael F, Easley, Governer
~~ ~~ William G. Ross 3r., Secretary
UJ 'y ~ I ~ ;1 1~'-- North Caro]ina Department of Environment and Natural Resources
~ 3
;. ; ~ .,~
- Coleen H. Sullins, Director
_ . , ' Division of Water Quality
~:}c~oh~r '~ 5: Zt7(}7
(~WQPi~,i°c~ #Or-(65~
~n~ristot~ ~. ~~,~ty
lY1t'. tr~r,rre Schlecht
Lalaralzerti. ~-.'~~~
351:5 Queers A~Ix. B~'~4e
Clayton, NC ?"'527
Subject Property:. _f.'~f~~~ooc'~ ~~a~l - ~~>ec~~o~~ :?
L~ co Mill Creek. (U304U2, 2~' 3~, WSIv, ?~``~}
~1D~~;'~~vs,l ~i){'s~~~ ~~'~ i7iG'd` Y~~i: ~IEy ~~A il~fS~`~3f'i;Q'~11 ~ai:~.~ L•~':~dYt);'i;fi Ci.d111 ~4~i'a[fli °~~. ~l',~' ~€l~l^~F'C.,1'h~ L~15 ~3I'
?~'31~84. ,T.°r'~~Wtii it ~~;"R ~~t~ i~';'~~?s~,~ .~i~ f1~~ ' ~a~i °t~ ; ~ 4~; )?l~, C~ S
~ CS { .~ .V~"~J~ W:a ~ 1'al 0~'[Q°S E. a 9Eti ~
Dear Mr. Sclecht:
You:have. our approval,. in accordance with the :attached conditions and those listed below, to:place fill
within or otherwise impact 258 linear feet of perennial stream and 11,686 square.feet of Zone 1 Neuse
River basin protected riparian buffer, and 7,374 square feetof Zone 2 Neuse River basin protected
riparian btaffer, as described in your. application dated October 1, 2007, and received by the Division of '
Water Quality (DWQj on October 1, 2007, to construct a residential development. After reviewing your
application, we~have decided that the impacts are covered by General Water Quality Certification
Number{s) 3631 (GC3631). The Certification(s) allows you to use Nationwide Permits} NW29 when
issued by the US Army Corps of Engineers (USAGE). In addition,: you should obtain or otherwise
comply with any other required federal, state or localpermits before you go ahead with.your project
including (but not limited to) Erosion and Sediment Control, and 1~,Ton-discharge regulations. ~`:rlsr, ~ r:is
,`8~'fi)S'QT'i!i ~Q ~)4'OI~~:~:C~ fi5i'i~11 ~Q4r1' ~)~'(?i7~$r't~ 1'aYlt1`a~9~ Off' ~Q ~otaf$~~a~i: l111F?i)~tS a'~ i~e~2le1P3 `•'$ f~f~j}4r~-~'..~ drz.
: :: 'J l.:' ' i'z j~11130: $lig`~ty ~'tt~ 9~ "'_9:ji1~ t','_~ 9l '~'ji '.0 a Q (' i~[°...' ntry..f~ ~4'Rf,. '.yt W$~ : :: :: :: :: ::
This approval is for the:purpose and design that you described in your application. If you change your
project, you must notify us and you may be required o send us a new application.. If the property is:sold,
the new owner must be given a copy of this Certification and approval letter and is thereby responsible. for
complying. with all conditions, If total fills for this project. (n®w or in the future) exceed one acre of
wetland or 1501near feet of stream, compensatory mitigation may be required as described in 1 SA
NCAC 2H .0506 {h), "]'i~=~ ~~i~~•~vtaa ~•AcilrEr•~s y~i~ to ~oilcl;,' ,~~ ~ortci~~ifl~.~s i5sbe:~ ir: ~~~c, ;,S@'t~xts'c3
:i''~iy.~i:a4C~A1 :11he1 ai.l!y Frsiii?d'.?~fili~l d~C'Y=C~71tJ~"aS ~35t3t? ~)1yiS~`
.~~,e t~ cic~i.e,~al Cc. _ibensxs o ilke mre~~ti 9 :~tt?a~ .~~e:
1. Impacts Approved
The following impacts are hereby approved as long as all of the other specific and general
conditions of this: Certification {or Isolated Wetland?Permit) are met. No other impacts are
approved including 'incidental impacts,
. ~a,e Carolapa
`/,PV~th 11
x}01 Oversight/Expr•ess Review Permitting Unit 61t111'R
1650 Mail Service Center,: Raleigh, North: Carolina27699-1650..
2321 Crabtree Boulevard, Saite 250, Raleigh, North Carolina 27604
Phone; 919-733-1786 /FAX [phone]./Internet: httn://h2o.enrstatg.nc.ps/ncwetlands

Lauraleen, LLC
]?Page 2 of 5
October 15, 2007
T 'e of I:n act Amount ~ ~o~ed TJnits flan Location or kteference
Stream - erennial 258 linear feet): PCN a e 4 of 10
Buffers. Zone 1 1,686 (s uare ft.) PCN age 7 of 10
Buffers. Zone 2 7,374 (s uare ft.) PCN a e 7 of 10
2. Na Waste, Spoil, Solids, or FiII of Any Kind
No waste, spoil, solids, or fill of any kind shall occur in wetlands, waters,: or riparian areas beyond
the footprint of the impacts depicted in the Pre-Construction Notification.: All construction
:activities, including the design, installation, operation, and maintenance of sediment arad erosion
control Best Management Practices, shall be performed so that no violations of state water quality
standards, statutes, or rules occur.
3. Erosion and sediment control practices. must be in full compliance with all specifications governing
the proper design, installation and operation and maintenance of such Best Management Practices in
order to protect surface waters standards:
a. The erosion and sediment control measures for the project must be designed, installed,
operated, and maintained in accordance with the most recent version of the North Carolina
Sediment and Ef^asion Control Planning and Design Manual.
b. The design, instahation, operation, and .maintenance of the sediment. and erosion control
measures must he such that they equal, ar exceed, the requirements specified in the most
recent version of the NoNth Carolina Sediment and ENOSion Control Manual. The devices
shall be maintained on all construction sites, borrow ites, and waste pile (spoil} projects,:
including contractor-owned or leased borrowpits associated with the project.
c. Sufficient materials required for stabilization and/or repaix of erosion control measures and
stormwater routing. and treatment shall be on site at all times.
4. Sediment and Erosion Control 1VIeasures
Sediment and erosion. control measures shall not be placed in wetlands or waters. to the maximum
extent practicable. If placement of sediment and erosion. control devices in wetlands and waters is
unavoidable, they shall be removed and the natural grade restored within six months of the date that
tlae Division of Land Resources hasxeleased the project;
5. Culvert Installation
All work in or adjacent to stream waters shall be conducted in a dry work area. Approved BMP measures
from the most current version of NCDOT Construction and Maintenance Activities manual
(http//www.ncdot.or doh/o erationsBMP manual/downloadBMP 1VlanuaLpdf)
such: as sandbags, rock bernr-s, cofferdams and other diversions structures shall be used to prevent
excavation. in flowing water.
Culverts required for this project shall be installed in such a manner. that the original stream profiles
are not altered. Existing stream dimensions {including the cross section dimensions,: pattern, and
longitudinal profile) must be maintained above and below locations of each culvert. Culverts shall be
designed and installed to allow for aquatic life movement as well as toprevent head cutting of the
streams. If any of the existing pipes are. or become perched, the appropriate stream grade shall be re-
established or, if the pipes installed in a perched manner, the .pipes shall be removed and re-installed
correctly.

Lauraleen, LLC
Page 3 of S
October 15, 2007
Culvert(s) steall not be installed in such a manner that will cause aggradation or erosion of the stream up
or down stream. of the culvert(s). Existing stream dimensions (including the. cross section dimensions,
pattern and longitudinal profile) shall be maintained above and below locations of each culvert.
Therefore, you must provide plans with adequate details that indicate .that the current stability of the
tream will be:maintained or enhanced. You must receive written approval from this. Office for the
above plans before the culvert(s) is:installed. Culvert(s) must be installed according to approved plans.
::Placement of culverts and other structures in waters, streams, and wetlands must be placed below the
elevation of the streambed by one. foot for all culverts with a diameter .greater than 48 inches, and: 20
.percent of the culvert diameter for culverts having a diameter less than 48 inches, to allow low flow
:passage of water and aquatic life. Design and placement of culverts and other. structures including
temporary erosion control. measures hall not be :conducted in a manner that may result in dis-
equilibrurn of wetlands or streambeds or banks, adjacent to or upstream and down stream ofthe
above structures. Thee. applicant is required to pxovde evidence that the equilibrium. shall be
maintained if requested in writing by DWQ.
The establishment of native, woody vegetation and other soft stream bank stabilization techniques
must be:used where. practicable instead of rip rap or other bank hardening methods.lLf rip-rap is
necessary, it shall not be placed in he stream bed, unless specifically approved by the Division of
Water Quality.
Installation of culverts in wetlands must ensure continuity of water movement. and. be designed to
adequately accommodate high water or flood conditions..
Upon completion of the project, the Applicant shall complete and return the enclosed "Certificate of
Completion's form to notify i~tCDWQ when all v~;ork included in the §401 Certification has been
:completed. The responsible party shall complete the attached form and return it to .the 401/Wetlands
Unit of the NC Division of Water: Quality upon completion of the project. Please send photographs
upstream and downstf-eam of each culverf ite to document co~Nect installation along with the
Certificate of Completion form.
6. Protective l~encing
The outside buffer, wetland or water boundary and along the construction corridor within these
boundaries approved under this authorization shall be clearly marked with orange warning fencing
(or similar high risibility material) for the areas that have been approved` o infringe within thee.
buffer, wetland or waterprior to any land disturbing activities;
7. Compensatory Mitigation Using the Ecosystem Enhancement Program (EEP)
iviitigation must be provided for the proposed impacts as specified in the table below. We
understand hat you wish to make a payment to the:Wetlands Restoration Fund administered by
the NC Ecosystem Enhancement Program (EEP) to meet his mitigation. requirement. This has
been determined by thee. DWQ to be a suitable method to meet the.mitigation requirement. Until
the EEP receives and clears your check (made payable to; DENR =Ecosystem Enhancement
.Program. Uffice), no impacts. specified in this: Authorizatian Certificate shall occur. The EEP
should be contacted at [phone] if yoio have any questions concerning payment into a
restoration fund.: You have b0 calendar day~~ from he date of this approval to make. this
payment. S~O~' f,^~?:ti[(ii_a~ ~ ai"i}(A9~$, r~~.t13 to ,.?(aP~s .,".~ ~f~it ~..~_ ~&~~^a$~; aa~~~?3a, kS'CS f~)~~'a1*_~~ 9~_ :aJ
bl~N F~%~C~4.~.R:(s(tS '~~3~Od'i ~i.~4E `{11t?:1 L 'F3 sub' $'~SEQ~?'B-$~ CLs4~$[?~'s5g~'~4Q['y dg1i~CS~iin(1~i
~~f~i~... ~~~~~..1i ~~4i ::: ::: ::: ::: ::: ::: ::: ::: ::: ::: ::: ::: ::: ::: ::

Lauraleen, LLC
Page 4 of 5
October 15, 2007
8. Protective Fencing
The outside buffer, wetland or water boundary and :fir„ng the ;;onstru~,i+cr~i :orridot ,~,,~i,,n tt.ase
.boundaries. approved under this:authorization shall bE clearly mailed ~~~_~~~ nr~~ng~ ,:, ;a, ~in~, izncng
(or similar high visibility material) for the areas that. have been appro~:,d tG~ Anzc ing,t -+~ i ~,hm ~i2e
buffer, wetland or water prior to any land disturbing activities; '
9. Certificate of Completion
_-______________ o .
Upon completion of all work approved within the 401 Water Quality Certification ~~r applicable
:Buffer Rules, and any ubsequent modifications, the applicant is required to return ri,e atrached
certificate of completion to the 401 Oversight/Express Review Permitting Unit, Noiir ~~aiolina
Division of Water Quality, 1650 IViail Service Center, Raleigh, NC, 27699-165Q
Violations of any condition herein set forth may result in revocation. of this: Certification and may result in
criminal andlor civil penalties. The authorization to proceed with your proposed impacts or to conduct
impacts to waters as depicted in your application and as authorized by this. Certification, shall expire upon
expiration of the 404 or CANiA Permit.
If you dq not accept any of the conditions of this Certification (assocf ated with the approved wetland or
stream impacts), you may ask for an adjudicatory hearing. You must act within 60 days of the date that
you receivethis letter. To ask for a hearing, send a written petition, which conforms to Chapter 150B of
the North Carolina General Statutes to the Office of Administrative Hearings, 6714 %vlail.Service Center,
Raleigh, N.C. 27699-6714. This certification and its :conditions are final and binding unless you ask for a
hearing.
Any :disputes over determinations regarding this Authorization Certificate (associated with the approved
buffer impacts). shall be referred in writing to the Director for a decision. The Director's decision is
subject to review as providedin Articles 3 and 4 of G.S. 150B.
_;
....................................................................................................................................................
This etter completes the review. of the Division of Water Quality under Section 401 of the Clean Water
Act and the Neuse riparian buffer protection rule as described within 15A NCAC 2B .0233. If you have
any questions, please telephone Cyndi Karoly or Ian iVlcivlillan at 919-733.-.1786.
Sincer
r
r }' Coleen H. Sullins, Director
Division of Water Quality
CHSlijm
Enclosures: GC 3631. :
Certificate of Completion
NCDWQ 401 WQC Summary. of Permanent. Impacts and:Mitigation Requirements
ca USACE Raleigh Regulatory Field Office
Lauren: Witherspoon,. DWQ Raleigh Regional Office.
.:.
.................................................................................................................................................... .
T e of Im act C'om ensa~orv IM~iti ation Re aired itiver anc4 Sub-basin dumber
Stream - erennial 258 (feet Neusel03020201

Lauraleen, LLC
Page 5 of 5
October 15, 2007
DLR Raleigh Regional Office
File Copy '
Central Files
Pe6h~. 1-'d~,~ -~ .~s. SC~iEC, P.A., 1 ~U~U~ ha~~e1~f h.id~e Roast, Ral~i~1~. NC ?'~~~a
F iici.am~;: 07ts BTt:r~~~aaF;esz~ ~..aion -f Tr~hnston)40tr24Bc~

`~~ W ~ r~9 Michael F. Easley, Governor
~, , :. Q
~C' G William G, Ross Jr., Secretary
-. ,
~ ~ ~ ~ # ~~~ , '~~~ 1~... North Carolina Department of Environment and Natura9 Resources
~ ~ I ~
O -_ '~ ~ t Coleen H. Sullins, Director
~„ .
Division of WatePQuality
,_
::North Carolina Division of Water Quality
~t0 i ~v'~'ater,l~itality Certification
Summary of Permitted Impacts and Mitigation Requirements
to accordance with 15A NCAC 2H.0500, Nir. George Schlecht and Lauraleen, LLC, have permission to fill or
otherwise impacY258 Linear. feet of perennial stream. and 11,&86 square feet of Zone 1 Neese River basin protected
riparian. buffer, and 7,374'square feet of Zone 2 Neese River basin protected :riparian buffer, to construct the
.proposed residential development at the site, which is orated near FIowers, rohnston County, :North Carolina:. All
activities associated with these authorized impacts must. be conducted with the:conditions listed in thee. attached
Permittransmittalletter. THIS CERTIFICATION IS NOT VALID WITHOUT THE ATTACHMENTS.
COMPENSATORY MITIGATION REQUIREMENTS, `ECQSYSTEM ENHANCEMENT PROGRAM
DWQ PROJECT.#: 20071&58
LOCATION: I~ lowers
COUNTY: Johnston
$ASINI SUB BASIN Neese/03020201
As required by 1 SA NCAC 2H.0500, and the conditions of this Certification, you are required to compensate for
the: above mitigabee impacts through the restoration, creation, enhancement or preservation of wetlands, surface
waters and riparian buffers as outlined below prior to conducting any activities that impact or degrade the waters of
the state.
Note: Acreage requirements proposed to be mitigated through the Ecosystem Enhancement Program must 6e
rounded to one:-quarter acre increments and inear foot. requirements must be rounded up to the nearest
foot according to 15 21t.0503(b).
tm acts..... hlAFi ation
2S 8 Linear Feet of Perennial Stream 258 Linear Feet of Perennial Stream
One of thee. options you have available to satisfy the compensatory mitigation requirement is through the payment of
a fee to the Wetlands Restoration Fund per NCAC 2R.0503. If you choose this option, please sign this: form and
mail the form along with a copy of your 401 Certification or Buffer Approval to the Ecosystem Enhancement
Program at the address below. An invoice for the appropriate amountof payment will. be sent. to you upon. receipt
of this form. PLEASE NOTE, THE ABOVE IivIPACTS ARE NOT AUTHORIZED UNTIL YOU RECEIVE
NOTIFICATION THAT YOUR PAYIvIENT HAS BEEN PROCESSED BY THE ECOSYTEM ENHANCMENT
PROGRA1Vi.
Signature Date
ECOSYSTEM ENHANCEMENT PROGRAM
1652 Mail Service Center: :
RALEIGH, N.C. 27699-1652
[phone]
Filename.: U71658TaftwoodsEastSection2(Johnston~101~NBR EEP
.........................................................................................................................................................
Nonr`thCaralina
401 Oversight/ExpressBeview Fermitting Unit ~~t7fClt~`l~/
1650 Mail Service Center, Raleigh, North Carolina 27699:-1650
2321 Crabtree Boulevard, Suite 250, Raleigh, North Caralina 27604
Phone [phone] / Fax [phone]
.Internet: http;//v+iww.ncwaterqualiry.org

~ _ ,
` - - ---
i ~~, _ .,,.., ~~ r
__ .~.~ ~ .~~.~j ~ ~ ~~ ~ ~~'I `I ~i, C; ~.~j .~~, Al r~~1 )(~1j ~ ~ f, fi II_ sue' ~ .~~, ~.~ ~~~+. :: :
_ ~...
~ 1101u Ravlen Ridge Road Raleigh, North Carolina 2?614 :Phone: [phone] Fax: (9:19) 846.9467
'~.. ~
www.SandEC.com
~~ ~ ~ ~ ember 20, :2007
S~.EC Project # 9197.W4
US Arlny Corps of Engineers
Attn: Mr. Thomas Brown
6508 Fa11s of the Neuse Rd., Ste. 120
Raleigh, NC 27615
RE: i~Totification of Statutory Status of Request for NWP #29
Taftwoods East-Section 2
Clayton, Johnston County, North Carolina
Dear vlr. Brown:
On Qctober 1, 2007, SPEC requested authorization from the US Army Corps of
Engineers {LTSACE) to utilize Nationwide Permit (NWP) 29 to provide needed housing
to meet the growing demands for this .area. 'Fhe purpose of the road crossings is to
provide access to otherwise inaccessible portions of the property. Proposed impacts. total
258 linear feet ofperennial stream and no wetland impacts, At this time, 50 days have
lapsed sinco the US :Army Corps of Engineer's receipt of the complete preconstruction
notification. To paraphrase the Federal Register {Voi. 67, No. 10, section 13a,1), the
permittee may begin the proposed work if the USAGE has not sent any written notices
(i.e. the permit itself or any notice of an incomplete submittal, etc.) within 45 days of the
District or Division Office:. of the USAGE receiving the completepermt application
herefore, according to the aforementioned regulation the client may proceed with the
:proposed activity as depicted in the submitted permit application and in compliance with
he NC-Division of Water Quality's 401.-Approval.
Sincerely,
< ~ ' `
,. ..
'Debbie Edwards.::::
Environmental Specialist
cc: ivlr. George Schlecht (Lauraleen, LLC)
Attachments
1. Copy of NWP GeneraY Conditions, Section 13
2. Copy of USAGE signed receipt of the :completed PCN application
~`harlotte office: L i-;~gn~h4 o~~tt~ce:_ .
z36 LePhilIip Caurt, Suite C 3817-E Lawndale Drive
Concord, NC 28025 Greensboro, NC 27455
Phone:: [phone] Phone: (336) 540-$~34
Fav• r7na~ 7~n_odnw F~x• rza~~ edn_st~za

2q9{) Federal RegisterdVol. 6?, No. 10ITuesday, January 15, 20021Notices
management requirements). Another
important component of water quality endspp.html and http:/Iwww.nfms.gov/
prot_res/esahoine.html respectivel
: written notice from the District or
Divisio
E
i

management is the establishment and
maintenance of vegetated buffers next to y.
12. Nfstoric Properties. No activity
which may. affect hist
i
r
i
s a
ng
neer, Subsequently, the
permittee's right toproceed under the

ipso waters, including streams (refer to
General Condition 19 for vegetated or
c p
opert
e
listed, or eligible for listing, fn the
National Register of Histo
ic Plac
s i N~YP may be modified, suspended, or
revoked only in accordance with the

buffer requirements for the NWPs),
This condition is only applicable to r
e
s
authorized, until the District Engineer
has complied with the provisions of 33 procedure set forth in 33 CFR
33o.5(d)(2).
projects that have the potential to affect
water quality. While appropriate CFR part325,1'ippendi.~; C. The
prospective
ermftte
h
rust n ~) Contents of Jotificatron: The.
aotification must be in writing and
measures must be taken, in most cases
it is not necessary to conduct detailed p
e
e t
oti t
District Engineer if the authorized.
activity may affect any historic include the following information:
(1) Name, address and telephone
studies to identify such measures onto properties listed, determined to be numbers of the prospective permittee;
require monitoring,
10. Coastal Zone d.-fanagemeiit. An eligible, or which the prosppective
permittee has reason to believe ma b (2) Location of the proposed project;
(3) Brief description of the proposed
certain states, an individual. state coastal
zone management consistency e
:aigible foe listing on the national ~
iegister of Historic
Places,
and shall not project; the project's purpose; direct and
indirect adverse environmental effects
;:ancutrence roust be obtained or waived
(see Section 330.4(4)). .
.
begin the~activity until notified by the
District Engineer that the requirements the projectwould cause; any other
NWP(s), ltegiana-. General Permit(s),: or
11. Endangered Species. (a)11'o
activity is authorized under tint i11",'p of the Alatonal Historic Preservation Act
'ra'g'e been satisFed and that the activit Individual Permit(s) used of intended to
~ wed to authorize any part of the
which is likely to jeopardize tli~
continued txistence of a threatened or y
7.s r~uthoeized. Tnforrnatiotx on the
1i~=non and existence of historic proposed project or any related activity.
Sketches. should be provided whey
endangered species or a species
proposed for such designation, as resources can be obtained from the State
Historic Preservation Office aad the: necessary to show that the activity
complies with the terms of the
identified under the Federal'hrid eyed
~ National Register of Historic Places (see (Sketches.usually clarify the project and
S sties
p ct (ESA), or which will
destroy or adversely modify. the critical 33 CFR 330.4
(g?)• For activities that may
affect historic properties listed in, or when provided result in a quicker
decision.);
habitat of such species. 2don-federal eligible for listing in, the National (4) For NWPs 7,.12,14,18, 2i, 3d, 38,
permittees shall notify the District Register of Historic Places, the 30, 41, •t2, and 43, the PCN must also
Engineer if any listed species or notification must state which historic include ~ delineation of affected special
designated critical Habitat might be property may be affected by the aquatic sites, including wetlands,
affected or is in the vicinity of the proposed work orinclude a vicinity vegetated shallows (e.g., submerged
project, or is located in the designated
critical habitat and shall notbegfn work P indicating the location of the
historic property, aquatic vegetation, seagrass beds), and
riffle and poet complexes (see paragraph
on, the activity until notified by the
District Engineer that the requirements 13. ~Jotification.
f a) Timing; where required by the 13(fj);
(5) For NWP 7 (Outfa115titictures and
of the ESA have been satisfied and that terms of the NWP, ills prospective Maintenance), the PC.N must include
the activity is authorized. For activities
that may affect Federally-listed permittee must notify the District.
Engineer with a preconstiuction information regarding the original
design capacities and configurations of
endangered or threatened species. or notification (PCI~ as early as possible. those areas of the facility where
designated critical habitat, the The District Engineer must determine if maintenance dredging or excavation is ',
notification must include the name(s) of
the endangered or threatened
ies the notification is complete within 30
days of the date of receipt and can proposed;
(6) For It :~' i ~ (Linear
spec
ihaE may be affected by the proposed request additional information Traasportation Crossings), the PCN
. work or that utilize the designated
eriticsl habitat that may be affected b necessary to make the PCAl complete
°nly once. However, ff the prospective must include a compensatory mitigation
proposal to offset permanent losses. of
y
the proposed work. As a result of formal perrnittee does notprovide all of the waters of •.he US and a statement
or informal consultation with the F4't-S " requested information, then the District describing how. temporary losses of
or NMFS the District Engineer may add Engineer will notify the prospective waters of the US rvitl he minimized to
• species-specific regional endangered
species conditions to the NWPs permittee that the ~aotificaton is still
incomplete and the PCN review process the maximum extent practicable;
(7) For NWP 21 (Surface Coal Mining
.
{b) Authorization of an activit b a will not commence until all off thee. ~.ctfvities), the PCN must include an
;'+TVi'P does not authorize the "take' of a
threatened or endangered s
ecies as requested information has been received
by ~® Distric.ingineera~'I'he Office of Surface Mining (OSh'd or state-
approved mitigation plan, if applicable,
p
defined under the ES A. In the absence prospective~crmittee shad not beein '1'o be authorized by this NWF, th,e
of separate authorization {e.g., an ESA
Section 10 Permit, a Biol feat O fnion
p tt1e~it ~
i nti notified in writing by the District Engineer must determine that
the activity complies with the terms and

with `"incidental take".provisions, etc.)
from the USF'lr`JS or the NMFS
both District Engineer that the activity may
proceed under the NWP ,with any conditions of the NWP and that the
adverse environmental effects are
,
lethal and non-lethal "takes:" of
protected species are in violation of the special conditions imposed by the:
District orDivision E freer; or
h minimal bath individually and
cumulatively and must notify the

ESA. Information on the location of
threatened and endangered species and (2) If notified in wn
ag by the District
or Division Engineer that an Individual
pe project sponsor of this determination is
writing;

their critical habitat can be obtained.

directly from the offices of the USFWS rmit is required; or
u
~„, {3} Unless .45 da shave passed. from
the Distri
t
i
° ('8) For NWP 27 (Stream and Wetland

Restoration), the PCN must include

and NMFS or their world wide web
pages at http:0/wwx~.fws.gav{r9etadspp/ c
ng
neer
s receipt of the
complete notification and the
pro
t
v documentation of the prigt condition of
the site that will be reveled by rite
.
spec
i
e permittee has not received permittee;
~~

~' 'r
r' , ~ ~ ;
.~F~' ; t' _ ...~
:'$~GRAM
September 26, 20t)7
George Schlecht
Lauraleen, LLC
......................................................................................................................................................... .
3515 Queen Anne Drive
Clayton, NC 27527
Project: afiwvoods ' t County: J• ~~ t_ ii°] ' 1'~~i:
The purpose of this letter is to .notify you that the North Carolina Ecosystem Enhancement Program. (NCEEP) is willing to
accept payment for impacts associated with the above referenced project. Please note that. this decision does. not assure tktat
the.payment will be approved by the permit issuing agencies as mitigation for project impacts. li is the responsibility of thee.
applicant to contact these agencies to determine if payment to the NCEEP will be approved.
This acceptance is va':id for six months from the date of this letter and is not transferable. ag ~vv i~,aF-,, ,,o ~•cc ~! red a cop; of
the essu~~3 ~'°1~ ~' ;,iyl'i?~t ~Ce~a taP~•Uatio-JLr`i.i~~~r~. p~.ar~~ ~.:ati:san this#Ixne f~s~~ae, thls ~ec~~t~s~z~~: ;aE ~1 e:cpi.~e. It is the
applicant's responsibility to send copies of the permits to i•~CEEP. Once NCEEP receives a copy of the permit(s) an invoice
.will be :issued .based on the required mitigation in that permit and payment must be made prior to conducting the authorized
worm. The amount of the In Lieu Fee to be paid to NCEEP by an applicant is calculated based upon the Fee Schedule and.
policies listed at www.nceep.net.
Based on the information supplied by you the impacts that may require compensatory mitigation are summarized in the
:Upon receipt of payment, EEP will take responsibility for providing the compensatory mitigation. If the regulatory agencies
require mitigation credits greater than indicated above, and the applicant wants NCEEP to beresponsibie for the additional
mitigation, the applicant will need to submit a mitigation request to NCEEP for approval prior to permit issuance. The
mitigation will be performed in accordance with the l~iemorandum of Understanding between the N. C. Department of
Environment and Natural Resources. and the U. S. Army Corps of Engineers dated November 4, 1998.
:f you have any questions or need additional information, please contact Kelly Williams at [phone],
J/S~i/n9cerely, ' j
0(dV~~a'm D: Gilmore, Fr; ~
~l !)irector
cc: Cyndi Karoly, NCD~47Q Wetlands1401 Unit
Thomas Brown, USAGE-Raleigh
Lauren Witherspoon, itiTCDWQ-Raleigh
Debbie Edwards, agent
File
,;
~,
d.- ~~~~.~ i~u
itilorth Carolina Ecosystem Enhancement Program,: 1652 iVlail Sentice Certter, Raleigh, I~1C 27699-1 652 / 91 9-71 5-0476 / www.nceep.rtet

~`I d1 ~ ~~:: l 7 ~ i 1 ~ r 5..~ 9 ^I .1 T ~'1 r-1 ~,7 rye
FIGURES

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Project Number: Map Title: €
9I97.DI
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J 9 SoH FA-whronmental Constilta its, P
RSP Taft Woods East 11010 Raven Ridge Rd.- Raiai h, NG 27614
[phone] - [phone]
scale: Johnston County, NC Web Page: www3a°tdEC.corn
" = I ,000
Date: Source:
/22/08 Flowers Quadrangle

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S : IJ & ENVIRONMENTALr .' .
PLAN SHEETS

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:I N ITY MAP
POGRAPNIC MAP
~ QUADRANGLE
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TAL DESIGN FIRM:
.ONMENTAL
ANTS, PA
~ Kedge Road
27614
>900
-R:
DEVELOPMENT CO.
Anne Drive
~~~~
COi~TEi~TS:
I . COVER, CONTENTS, ~ VICINITY MAP
2. EXISTINIG SITE CONDITIONS
3. PROPOSED DEVELOPMENT PLAN
4. PROPOSED STORMWATER BMP DRAINAGE AREAS
5. PROPOSED SITE CONDITIONS SHEET DRAINAGE #
6. PROPOSED SITE CONDITIONS SHEET DRAINAGE #2
7. PROPOSED SITE CONDITIONS SHEET DRAINAGE #3
8. PROPOSED SITE CONDITIONS SHEET DRAINAGE #4
9. PROPOSED SITE CONDITIONS SHEET DRAINAGE #5
0. PROPOSED SITE CONDITIONS SHEET DRAINAGE #6
I . PROPOSED SITE CONDITIONS SHEET DRAINAGE #7
2. CONSTRUCTION SEC~UENCE ~ TEMPORARY SEEDING SPECIFICATIC
3. FLOW SPLITTER ~ LEVEL SPREADER DETAILS
4. EMERGENCY SPILLWAY ~ LEVEL SPREADER DETAILS it
5. EROSION CONTROL DETAILS
6. WET DETENTION POND DETAILS
17. WET DETENTION POND DETAILS II

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, ` , _... .......LOT 7! .._.w,.,.,. t} /, J
•,~ 27, 637 sq. ft. ~./'"~•.,. ';
COT 72 ,y 0.634 acres • ,,, ,.. +`-•"'`
26.!80 sq. k. { ........... ..~-`'': ~,.*`"~ `"~. -
` a.»...,.___,- _. ,17:60!-acr~5,,,,....<°'240 ~....--.... .a..°»~°- .,p ..°. ,r .'~,~ -' _
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,,` __ __..., - ,, ~. NOTES:
__.. ,
_ •-' ~ ~ ~ _,~ . ---•~ '" °°-•• •._ --''~ i . SITE DATA INCLUDING CONTOURS, ROADS, P
`,.. /~ , _ LOT LAYOUT, DRAINAGE AREAS, FLOODPLAIN
,,,.. r -' ~ ,, I
,. , -. __..._____._,.a_
~. SITE FEATURES PROVIDED BY DENNIS RAY BL
,,. ~ ~ IT I LD, N
. .,- ,
.... _ 4
+ '~ / SM HF E G STREAM WIDTHS SHOWN A
,,, ____.
.-- ----- * ~ ~! l` ~ ~ F~ ~ ~ WETLAND DELINEATION PERFORMED BY SPEC.
-° ~ 2.
'~ J 3. ALL LOCATIONS, ELEVATIONS, AND DIMENSIC
I ~
4. LOCATION OF PROP05ED WET DETENTION PC
''~ ~` ' ~ '~ `'~ ~ FOREBAYS, AND BYPASS CHANNELS ARE APP
Toy,„__ ~ ADJU57ED BY 7HE ENGINEER AT TIME OF COt\

~ v
5 ~ 1 LVVVI LFl11V
~~"'~~ ~'' `~~
~, ~
~ PROPOSED CULVERT
LOCATION (BY OTHERS) \ DRAINAGE EASE
..
__~ r .
LEVEL SPREADER
DRAINAGE AREP

~
~ ~
~ _
FOREBAY ~ ~
BYPASS CHANN

~_

--
~
I
_

.:
NORTH
. SCALE I " = 21
-_ ~ ,. --_ . 20 I ~ ~
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'
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LOT 66
28, 6 / l sq. ft.
a
O. ~'S7 acres
NOTES:
I . SITE DATA INCLUDING CONTOURS, ROADS, PROPERTY 80UP
LOT LAYOUT, DRAINAGE AREAS, FLOODPLAIN 80UNDARY, Ar
SITE FEATURES PROVIDED BY DENNiS RAY BLACKMON, R.L.`
SMITHFIELD, NC. STREAM WIDTHS SHOWN ARE APPROXIMA

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VIDE RIP-RAP LINED ~ ,~ `'~ /
'=RGENCYSPILL~.~/F.~ i l 76,952 q. lt. `^. ,4~~ _~ LOT 63 30,' ' q. k.
'"ti,4 1:767 arras "`+. /',' { 07
Sues
3, 594
,° ~ ~ ~. i ~t 1F~NANT POOL.,,, ._._.,....- sq. k
{ i 0.542 acrce
l ~ '` ~~Lr_~~,',TION 189 ._~ ~ JJJ
~ ~-~ ~ ~~ t ,, ZOT 33 ! / - i
~ ~ - ~ /
~ j '~ i rr
, ~ 05~ L T67
~ -Ukt~AY' - 0 26ars
/ /
~, ~' ~ ~ ~~C2' ~ONC:RETE RISER ~ ir'~C P PIPE ~ ~~
`O LE~EL SPREADER , ' ~ i ;± ~, 1 't
1 ~~ i L T3f ~.t N LQTj6!
52. 3 sq. k } LOT 32 ~ 33,8 ~': ~
.j .. ~ f l.! Sacres ~ 30876 acs / '07 N O ...
N
s
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PROPERTY ;~ L(~i - - -
t 26 I ' ~.•
BOUNDARY STREE7-Q. ~ o. .~.
,
t ;
~~ PROPOSED ROADS „' ~. I ~ LgTSo
..~ ` / ~ /, 766.zq k.
- { _ .3~ .64B acre ..e'•
- - , r LOT 28 - ...
, 24,995 q.. k. .~' '
~~ .~
,,
50' RIPARIAN BUFFER ~ °
. , ,,,
` OTE _ "
':~ ~', 1 N S:
I OO-YEAR FEMA ;, ,, ;' ~` € € I . 51TE DATA INCLUDING CONTOURS, ROADS, P
FLOODPLAIN ~ LOT LAYOUT, DRAINAGE AREAS, FLOODPLAIN
' ,~ .i 517E FEATURES PROVIDED BY DENNIS RAY BL
' SMITHFIELD, NC. STREAM WIDTHS SHOWN A
- ,~ !
Rc~~ ~ -,~ DRAINAGE EASEMENT ,; ~ a ~ ( 1 2. WETLAND DELINEATION PERFORMED BY S=PEC
L_ ~r f
,. s
°, 5, r, ~ , 3. ALL LOCATIONS, ELEVATIONS, AND DIMEN5IC
,. ~~,, <
~:;, , ~ ,.
< ~:, ,
DRAINAGE AREA ,~` ~ .__ 4. LOCATION, SIZE, ELEVATION, AND TYPE OF PI
r ` "` ~~ DETENTION POND, LEVEL SPREADERS, PORES
; ,
_ CHANNELS ARE APPROXIMATE AND MAYBE AC
'- - , ENGINEER AT TIME OF CONSTRUCTION.
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WETLAND IOC
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lNIS RAY BLACKMON, R.L.5. OP
3 SHOWN ARE APPROXIMATE. I I PROPOSED CULVERT
-D BY SPEC. .. _ ~ LOCATION (BY OTHERS) \ DRA
D DIMENSIONS ARE APPROXIMATE.
~.. '', LEVEL SPREADER ~ DRA
TENTION POND, LEVEL SPREADERS, ~~
L5 ARE APPROXIMATE AND MAYBE _
IME OF CONSTRUCTION. _. ~-I ~ -I

CALF I " = 25'
i 2.5 O «.......25
DUR INTERVAL = I' ~:`.
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PROPOSED CULVERT '''. DRAINAGE EASEME
u LOCATION (BY OTHERS) \

LEVEL SPREADER I~
I I DRAINAGE AREA

FOREBAY ~ ~ BYPASS CHANNEL

NOTES:
I . SITE DATA INCLUDING CONTOURS, ROADS, PROPERTY BOUNDAR
LOT LAYOUT, DRAINAGE AREAS, FLOODPLAIN BOUNDARY, AND O
SITE FEATURES PROVIDED BY DENNIS RAY BLACKMON, R.L.S. OF
SMITHFIELD, NC. STREAM WIDTHS SHOWN ARE APPROXIMATE.
2. WETLAND DELINEATION PERFORMED BY 5#EC.
3. ALL LOCATIONS, ELEVATIONS, AND DIMENSIONS ARE APPROXIM/
4. LOCATION OF PROPOSED WET DETENTION POND, LEVEL SPREADI
FOREBAYS, AND BYPASS CHANNELS ARE APPROXIMATE AND MA
ADJUSTED BY THE ENGINEER AT TIME OF CONSTRUCTION.
5. PACOLET LOAM SOIL TYPE AT LEVEL SPREADER WITH 2-6 IN/HR
PERMEABILITY FROM JOHNSTON COUNTY 501E SURVEY.
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__ ~ _ _ - - ~ ~ ~ `~, SMITHFIELD, NC. STREAM WIDTHS 5t10WN Af
. __ 4 :•. 3,r; .~' ~`k ,,,. - 2. WETIAND DELINEATION PERFORMED 8Y 5#EC.
._,~~' ~,~ ,t _
.•'~ ~°~ 3. ALL LOCATIONS, ELEVATIONS, AND DIMEN510
., ,..
,, - .-~' ;~, 4 =`"r~ ~~'''*• LOCATION OF PROPOSED WET DETENTION PO
4
,, ! FOREBAYS, AND BYPA55 CHANNELS ARE APPF
"°" " --°• _ - I ADJUSTED BY THE ENGINEER AT TIME OF CON
+"^,~ . - ;~ 'A '! ~ r ,-+'"'a ~ 5. PACOLET LOAM SOIL TYPE AT LEVEL SPREADS'
• ~ .m - i o~ ~" PERMEABILITY FROM JOHNSTON COUNTY SOII
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~~
• -_ i ,
.-
.~.
.._.. _ _
< '-__ _
"~'"
,. ~, ,
., ,.
' ~.;.
~. 4 w,,.. ~ (J
/ ~ '
,.~ ..
~.
~,
_. •
~.. ~ '
• ~. --
~,w _. _.__._.. ~~
~~
_ STREET O~, ~4y-
,. ,
~~ ~ ~~ ~\ ~ ,, t ~.. _ - -__ .- - - ~ -
,~~, ~ EXISTING ~ PRO
.,
_ ~ _ f' CONTOURS BOL
-. -. -.
.. ,
.~ ~, a
c' `. ~ `.
O~ '~ ~' v
-.
-.
~__
_._ ...
~, v...
ioraa "" .___ - PARCELS ' ~ PRO
,. ,..
- .___
.-~,...
,~Stormwater -„~....y,~ ~ ~ ,. _ w EXISTING 50'
- .-__~~
e.~
Y ._. ~.
Conve ance Swale ~"~ STREAM Ct1ANNEL
-.~„,,,~ _ - _ ano - -
w _ . __
-~-...,.~.r. .- ~-`~--_. ~ a WETLAND IOC
._ _ _
FLO
~~
.P''`f{ y*~'`°"~ '. I-~ PROP05E[~ CULVERT ~,
,.,~-' -~'`' ~ LOCATION (BY OTHERS) ~ DRP'
_ ~ .,,~.--.,~4, ', .- ~.~-~-~'"" ~ LEVEL SPREADER ~ DRA
.,
,,
.. P/„-.-
__ -
._. ,,,-
~_
,.
~. ~ _. ~ ~~
_ _*

a~n
`,~
~`~.,
- - ~~
NORTH
1
~~
SCALE I " = 40'
40 20 0 __ . ao
CONTOUR INTERVAL
® "~ ~ NOTES:
I . SITE DATA INCLUDING CONTOURS, ROADS, PROPERTY BOUNDAI
LOT LAYOUT, DRAINAGE AREAS, FLOODPLAIN BOUNDARY, AND C
S1TE FEATURES PROVIDED BY DENNIS RAY BLACKMON, R.L.S. O
_. SMITHFIELD, NC. STREAM WIDTHS SHOWN ARE APPROXIMATE.
2. WETLAND DELINEATION PERFORMED BY SPEC.
3. ALL LOCATIONS, ELEVATIONS, AND DIMEN510NS ARE APPROXIM
~~
--___ },
._
I~
/~
f a , ~ 4. LOCATION OF PROP05ED WET DETENTION POND, LEVEL SPREAC
FOREBAYS, AND BYPA55 CHANNELS ARE APPROXIMATE AND MP
ADJUSTED BY THE ENGINEER AT TIME OF CONSTRUCTION.
_Y I5. PACOLET LOAM 501E TYPE AT LEVEL SPREADER WITH 2-6 IN/HR
PERMEABILITY FROM JOHNSTON COUNTY 501E SURVEY.
EXISTING PROPERTY
I' CONTOURS ~ BOUNDARY
PARCELS ~ EXISTING ~
PROPOSED ROAD
EXISTING
STREAM ~''A~~~iJEL }~ 50' RIPARIAN BUF
f;° ~ WETLAND 100-YEAR FEMA
FLOODPLAIN

I~n~n~n~..~ PROPOSED CULVERT
LOCATION (BY OTl1ERS) °`~. I
~,a DRAINAGE EASEM.

II~I~ 4Jr: lal.JC~I~~..L~.m
Jf~-DWQ and Johnston County approval for construction.
irk existing utilrties on site.
;e around perimeter of work area. All installed temporary
erosion control measures will be inspected weekly and
~ainfall event (> 0.5 inches) by the Contractor.
supplement site erosion control measures as required by
~. Upon inspection, any necessary repairs will be
the Contractor.
spreader construction including forebay, level spreader,
s5. Level spreader shall be constructed as shown on the
ss channel construction must stay within the temporary
t ampacts shown in the pre-construction notification based
.I dimension shown on Sheet 15.
water detention pond construction. Construct pond and
ices according to details on sheet 16.
ary and permanent seeding measures to disturbed areas
9 is reached. Line surrounding perimeter slopes with
ing on slopes greater than 3N: I V.
°a has been stabilized and ground cover is established,
icing and any other temporary erosion control devaces
~e purposes of level spreader construction.
walk-thru inspection with Owner, Engineer, and Agency
es
General
All denuded areas shall be temporarily and permar
seeded as follows. Seeding and mulching shall be
immediately following construction. All disturbed
shall be dressed to a depth of 8 inches. The top
inches shall be pulverized to provide a uniform seE
Seeding
Seeding Dates
May I -Aug. 15
Aug. 15 -May I
Seeding Species Rate (Ibs/~
German Millet I C
Rye (grain) 3C
Permanent Seeding
Bypass channel
All other disturbed area
Bermudagrass
Switchgrass
Mulch
Mulching shall consist of small grain straw applied
rate of 2 bales/ 1000 sq.ft. No asphalt shall be ~
for tacking. Use lute, excelsior matting or similar
material to cover exposed areas of concentrated
Maintenance
Inspect and repair mulch frequently. Refert~lize ar
reseed as required to maintain vigorous temporar
vegetative cover during construction.

v ~ / I ~-Typical / wth 6 oz Non-woven Geotextlle Underlayment
z 1- -E-- 3° RYp•)
.~ c
Instal' Eroslon Protection
d - r{5 90° (look @ 12" ~ to Allow for Smooth
S Bottom Bar 4" ~ i Transltlon with Downslope
> ~ #5 STR Long. Ground Surface
.d .
f _
~'
T ~ I,.
p. ~- #5 STR Long.
I i ~'I
~-- #5 STR @ 12"
30" -~
1DER CROSS-SECTION -SECTION A-A (TYP.)
(NOT TO SCALE)
Bypass
FEow
Trapezoidal Bypass
Channel, brass-lined
See Table # Details
-~ ~ A
~i~:~~ ~~~~~~ ~y~
i
I i' ~-' ~ ~
U
~~ I `~J
[~';i
:~
L
Inflow Channel
or Plpe
ALL CONCRETE ShALL
BE 4,000 PSI, AIR Elevation Vane
ENTRAINED with Top of Fc
I "Chamfer - 811
Typlcal i
. ~ ~' ~ G,~
#5 90° book @ 12" , ~ • ' #
•~
invert Sediment ~' ~ ~I ..',°~. ''' '~ ~~
Forebay -
dh. 9
z ~
I .I '
Forebay /Flow Sputter /Level
Spreader Table
DA # Forebay
Area (ftz) h (ft) d bn) L (ft)
I 112.7 I .38 8 129
2 28.6 1.38 4 32
3 --- --- --- 130
4 26.3 1.13 4 30
5 28.7 1.06 ~} 29
6 52.9 3.x}5 4 51
7 63.3 1.36 6 72
3-Inch Layer
wCDOT #57 Stone
Erosion Protection
See Detal!
~~2 ~ - it ~;., ;v ,~,y Cast-In-place
~ . -~ ~, ? '~i ~-~ „-~.-~-- Concrete Footer
t J c,
11 ,~~, ,o,v ~,. ~ '1 See Detail
a ~ a' --~
k ~ ~ ~ d
LEVEL SPREADER SYSTEM -TYPICAL PLAN VIEW
>•. 8 A".
. t i ~..n ~, ~. ,
I ,i.' •~~'• .
i -~ ~.
~' ~ ) •.
• .: ~.
#5 STR Long. ~~ 1 '~ I' °' ~ ~': p
L. ~~ ® ®®
.. ~ ~.,.
L ... .m~','.
r ~ ~o
../ ~~~'
#5 STR @ 12" ---~-----~------- ._-_ ---_ ~_~__~.
SECTION B-B
(NOT TO SCALE)
I "Chamfer - ~ 8"
Typical ~,
Elevatlon Comcldent
with Invert of _T tf ~~
Bypass Channel '~,
d~ I I I :~ ~;>
Elevatlon Comcldent
Top of Forebay Eleva
6" Cr
- -
Invert Sediment ~
Forebay ~ _
~~ ~~~ ~ • 1.5'Typ.
PVC Level Spreader / ~ (' ' ~ #5 90°
Feeder Orifice -/ #5 a P. _~, ~ ~ Hook @ 12"
See Table Lon,;; i
.I
Swale Upslope _ ~ I ~'
- of Level Spreader, i----L, ~ I-,- - -- -----~-
3' V'/Ide, 6" Deep ~ '
I ~'
i ..
12" Min. ~ _..
= ~ ~ ~ I
-~ #5 '
SECTION C-C
/A I/'1T T/'1 G/^AI G1

., , ,n a ., 24..
#5 STR

2. Expansion Jomt Required Every
6" PVC Ribbed Waterstop
Split Type Acceptable,
Bulb OD = r"
I . ASTM D7 174 Peel Type Such a
Elastomeric Sealant may he App
Surface
2" Preformed Joint
Filler, Each Side
EXPANSION JOINT
(NOT TO SCALE)
Top of Dam
Elev. 192
32' -I
~,' . --
.4`%
2' Emergency ~~
~ Spillway ~ ~; ~ `
Elev. 1 9 1 .00~~ ,\~I 5' Thick
R V 'V
~---- ~~ Vt~~~ ~ .-~1 ~/'-.C~ Class I Riprap
'';';~~'~~'.,~";;~ ~I O az. Non-woven
Geotextele Underlayment
~- 2D~ -~ Burry Ends as Shown
TION VIEW (TYP.) LOOKING DOWNSTREAM
(NOT TO SCALE)
Top of Wet Detention
Pond Embankment, elev.
= 192, Crest Wdth =6'. Grade Downstream
Slope Nat Steeper
r f~~~`v~~'"-~~~ ~Than5H:IV
`. , :,
~~ ~ ,
p of Emergency Spillway,
Elev. = 191'.
PROFILE VIEW (TYP.)
(NOT TO SCALE)
I "Chamfer Wall
i~Typical Thickness
WALL ONLY -TOP VIEW
(NOT TO SCALE)
----i------T
I I
I I
I I
I I
Wall I
Height ___+_____+.
I I
I I
I I
I I
I I
T-----T-----T
I I I
I I I
I I I
I
I
I
I B
B
I
I I
I
I
I
I
I I
I I
I
I I I ~ I
I I I I '~
°- -----' -- ' ' •- --t
° ~------ ;~- L`
Footer #5 STR @ 12" _~
Thickness Typical
WALL ~ FOOTING ELEVATION
(NOT TO SCALE)
PRAP-LINED EMERGENCY SPILLWAY
#5 STR Long.
Cut at Joint
in Wall
STR Long.
#5 Hooks Typ
NOTE: REQUIRED EVERY 12-I 6' IN WALI
EXPANSION JOINT OR CONSTRUCTION A
JOINT MUST COINCIDE WITH ALL CONST
JOINTS IN FOOTING; HOWEVER, FOOTIN
NEED JOINT AT EACH WALL JOINT.
CONSTRUCTION AND CRACK CONTROL JOINT
(NOT TO SCALE)

Min. i 2- I /2 Gauge
~' Hoax Intermediate Wires

DESIGN DEPTf1 (d)
r
~~
'CHANNEL LINING
DE51~G/iDT O B OM
LEVEL SPREADER BYPASS Cf1ANNEL
(NOT TO SCALE)
SWALE T (FEET) B (FEET) d (FEET) Z (FEET) Slope LINING
DA # I I I .0 9.0 0.3 3.0 4.8% EROSION CONTROL MATTING
DA #2 4.5 2.5 0.3 3.0 6.0% EROSION CONTROL MATTING
DA #4 4.0 2.0 0.3 3.0 2.0% EROSION CONTROL MATTING
DA #5 4.0 2.5 0.3 3.0 4.3% EROSION CONTROL MATTING
DA #6 4.5 2.5 0.3 3.0 5.9% EROSION CONTROL MATTING
DA #7 6.0 3.5 0.5 3.0 2.0% EROSION CONTROL MATTING
~~ /Grade
%\ ~., ~T 6" Min. Cover
Over Skirt
*\
~. \ \ Anchor Skirt as
~ Directed by Engineer/
\ ~~ Designer
Steel Post
__._~-Woven Wire Fabric
Silt Fence Fabric
~''
~ /~
~,
3' Both 3' Both _
Directions Directions
Wire Staples
Erosion Control ~ `~ I -
~'j-~rrr-~_ ~ I-
Matting _I !-I 11-1 I (- I I II= =1
-~ ~',--i'1T='I I I~ I ~= -1 11=1 11=1 I =l ~ J=
II '! I-III-III -III' -1 I I=1 11-1 11=1
III~I::;,~I1=~IIII~IIIIII~I~I~~IIiII,~IIIIII;,III,;,III
Erosion Control Matting,
Anchor In Trench @ Both
Top and Bottom Edges
WIRE Sl
(NOT
)E VIEW
~RARY SILT FENCE DETAIL
O SCALE)
EROSION CONTROL MATTING ANCHORING DETAIL
(NC~T Tn ~iC'AI F)
~r.ir i nc~x~

_..
~ 2 I F', . rSl ~ OP:C~T fE OUTLET ,TOP OF DAM, L~EV. = I °2
' - CO~'J I r~~iL oV KU~I U':E 'rJi I H Wl MIN. 3" LAYER TOPSOIL
EMERGENCY SPILLWAY, ELEV.
ZMAL POOL ELEVATION, ~ = 19 ! ,SEE DETAIL
Y DRAWDOWN ORIFICE, CREST WIDTH = 6 FT, '
ORIFICEDIAM. = 6.E3" SEE DEfA1L SHEEP ~m-~ IiDPE SEEPAGE COLLARS,
_ _ __
i , ~ ' 2 EACH, MINIMUM DESIRED
DIMENSION 3' BEYOND OUTSIDE
OF PIPE IN ALL DIRPGTIONB
_ ~ ~ UNLESS APPROVED BY DESIGN
6 __..._ _..__......_..
)INVERT,- / ~NGINEER
~. - 180' 3H _ 3H
I. ~ _ ~IV
r __. _
.r _
,~
~' _ _ I I I .._ _ _ ~ -- -- _ _- _
,.
r: _~Y
~, ; ;
VAINTENANC~ST IRON ~ 'UPSTREAM BARREL INVERT, '
E VALVE, ~/ ELEV. = 183
ELEV. = IB2'
' UNDERCUT A5 DIRECTED CAST-IN-PIACE REINFORCED CONoCRFfE DOUBLE WALLED, SMOOTH INTERIOR HDPE '
"ORRUGATED PLASTIG PIPE W! JOINT
8Y ENGhNEER AT TIME ANTI-FLOATATION ANCHOR SLAB (6' X 6' X 2' THICK) :ASKEfS ~ GEOTEXTILE WRAP,
OF CONSTRUCTION BASED SEE DETAIL
ON SITE CONDITIONS,' i'IPE UTAM. = 12"
OUTLET CONTROL STRUCTURE ~ EMBANKMENT ELEVATION (TYP.)
(Nor To SCALE>
NOTES:
I . INSTALL EROSION CONTROL MATTING ALONG SIDE SLOPES
OF WET DETENTION POND AS DIRECTED BY THE ENGINEER
AT TIME OF CONSTRUCTION.
2. INSTALL EROSION CONTROL MATTING IN EMERGENCY
SPILLWAY SECTIONS OF WET DETENTION BASINS AS
DIRECTED BY THE ENGINEER AT TIME OF CONSTRUCTION.
3. EROSION CONTROL MATTING SHALL BE INSTALLED TO
MANUFACTURER'S RECOMMENDATIONS AND AS SHOWN IN
DETAILS. MATTING 5f1ALL BE USED ON ALL AREAS WNERE
EARTH IS EXPOSED TO EROSIVE VELOCITIES.
.. ~ ^` TO' LEVI
INVERT AT TOE OF DAM, '
ELEV. = 183' (APPROX)

RISER CREST ELEV.
RISER SIDE ELEVATION
6" Min.
- E"
UPSTREAM B .
BARREL INVERT
183'
- 6 FT.
~ ~~~
~A~
F ' -6~~
CUT SECTION i 2" DIAM.
RCP, SPIGOT DOWNSTREAM
W/JOINT GASKETS AND
NONWOVEN GEOTEXTILE
.R PLAN
SECTION B-B
OUTLET STRUCTURE CONSTRUCTION DETAILS (TYP.)
(NOT TO SCALE)
FIT WITH REMOVEABLE
CONCRETE LID
3" MIN.
TYP.
#5 "B" @ 12"
ALL SIDES ~-
#5 "A" @ 12" ~__. fit'
ALL SIDES ~~-
CONCRETE 4000 PSI ~~
@ 28 DAYS
BOTH DIRPCTIONS
3" MIN. _. -~ - :-
TYP.
RISER MAY BE ONE UNIT
OR MULTIPLE SECTIONS
PROVIDE ANCHOR STRAPS
"RAM NECK JOINT SEALANT
PLACE CUT END OF PIPE
PIPE SHOULD 8E FLUSH
WITH INSIDE OF RISER
rl.. ~ ~
sri~ ~ _~?, I
_1 - ,_6~,
CONSTRUCTION JOINT
CLEAN BASE SURFACE
FILL RISER BASE TO NEAT PORTLAND CEMENT GROUT
BARREL iNVERT PLACE RISER IN WET GROUT
AND SLOPE FOR
POSITIVE DRAINAGE
SECTION A-A
#5 "B" @ M 2"
ALL 51DES
~1
_ ,_ ~ 6,.
~~...._....._ I ^-
I~l------ -I.~-~.~
v t 3 :~
~~
#5 "A" @ 12"
Alf Sides
CAST PIPE SECTION W/
SPIGOT END EXTENDING
BEYOND RISER ANCHOR
BLOCK TO ALLOW FOR
ARTICULATION
HOT DIP GALVANIZED
STEEL PLATE:
3" W X 12" L X I /4" T
ALL 4 SIDES OF RISER
x. .
~.
~~
a ; "
4" TYP.
d'', ~
2" MIN.
TYP.
- ~ L
,.
.m~ .'
e •
i
2'-G"
~,A~~
2'-6..
..8..
..C..
R/F BAR CONFI~
BASE R1F PLf
I /2" G
3„ A325
HOT [

~ GALV,
. ~
~
.••.
•~ .
•
..~
. ~ ,
d'

•~ ~.
•
_
.; g~
. '
~

~ ~
.
~~
RISER ANCHOR STRAP DETAIL (INSIDE
(NOT TO SCALE)
i E.- ..: ~