20071658 Ver 1_Stormwater Info_20080204

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Soil & Environmental Con"~'u`l~tants, PA~
11.010 Raven Ridge Road Raleigh, North Carolina 27614 Phone: [phone] Fax: [phone]
www.SandEC.com
Transmittal
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DESIGN CALCULATIONS
TAFT WOODS EAST LEVEL
SPREADER DESIGN
JOHNSTON COUNTY, NORTH CAROLINA
Prepared for:
NEUSE PARK DEVELOPMENT CO.
Clayton, NC 27527
January 2008
S&EC Project No. 9197.D1
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Kebecca S. Peterson, PE
NC License No. 31266
Soil & Environmental
11010 Raven Ridge Road Raleigh, North Carolina 27614 •
www.SandEC.com
Consultants, PA
Phone: [phone] Fax: [phone]

Soil & Environmental Consultants, PA
Taft Woods East
Project Location
S&EC Project No 9197.D1
January 2008
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 the intersection of Motorcycle Road and NC Highway 42 East. See Figures 1 and
2.
Stormwater Plan
Level spreaders are proposed for the distribution of concentrated stormwater on this
residential development in order to comply with the diffuse flow requirements within the
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 was approved October 15, 2007.
A total of seven (7) drainage areas were evaluated for Stormwater runoff and level
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 swales to 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.
Level Spreader Planning & Design
Calculations for the sizing of level spreaders and their components were performed by
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-inch/hour design rainfall. Utilizing the Rational Equation, we then calculated a design
discharge for each drainage area. Based on this 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 the maximum 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
1 of 3

Soil & Environmental Consultants, PA S&EC Project No 9197.D1
Taft Woods East January 2008
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
BMP manual. Attached is the required Preconstruction Notice for the Riparian Buffer
Authorization for each of the bypass channels.
The forebays in this project have been designed to settle suspended sediments as well as
to split the stormwater flow to the level spreader and the bypass channel. The forebays
have been fitted with an appropriately sized pipe that discharges to the swale upstream of
the 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 to the
level 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 1 inch/hour storm to flow through the pipe to the level spreader.
Once the flow entering the forebay exceeds the 1 inch/hour storm, the bypass channel
will be activated. Again, each bypass channel was sized to 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 will naturally drain within 24 hours, and therefore
no underdrains are necessary. 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 permeabilities greater than 0.6 inches per hour.
2 of 3

Soil & Environmental Consultants, PA
Taft Woods East
List of Attachments and Figures
Attachments:
S&EC Project No 9197.D1
January 2008
I. Level Spreader and Wet Detention Pond Calculations
II. NCDENR Level Spreader, Filter Strip, and Restored Riparian Buffer
Supplement Worksheets, Checklists, and Photos of Proposed Level
Spreader Locations
III. Filter Strip, Restored Buffer, and Level Spreader Inspection &
Maintenance Agreements
IV. Riparian Buffer Authorization Pre-construction Notice
Figures:
Figure 1 - USGS Map
Figure 2 -Soils Map & Aerial Photo
Plan Sheets:
Sheet 1 - Cover, Contents, & Vicinity Map
Sheet 2 - Existing Site Conditions
Sheet 3 - Proposed Development
Sheet 4 - Proposed Stormwater BMP Drainage 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 11 -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 -Wet Detention Basin Details
Sheet 16 - Emergency Spillway & Outlet Protection Apron Details
36 pages
28 pages
25 pages
19 pages
3 of 3

SOIL & ENVIRONMENTAL CONSULTANTS, PA
ATTACHMENTI
LEVEL SPREADER AND WET DETENTION POND CALCULATIONS

Level Spreader Design Spreadsheet
DA #1
Taft Woods
S&EC Project No. 9197.D1
I. Determine Contributing Impervious Area and tin/hour Discharge Rate
1. Weighted Rational Coefficient, C = E[C;*%A;]
C ~ =Rational coefficient for development area i
A =Area
Total Drainage Area = 5.02 acres
Development Area (ft2) Area (ac.) % Area Rational C % Area * C
Lots -Impervious (roof, parking, etc.) 27582.25 0.633 12.6% 0.95 0.120
Lots -Forested 0.00 0.000 0.0% 0.15 0.000
Lots -Lawn (maintained grass) 123377.48 2.832 56.5% 0.2 0.113
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 rational coefficient, C = 0.393
impervious drainage area = 56358.79 ft2
total drainage area = 218517.83 ft2
2. Discharge Rate , Q = C*i*A, cfs
Rational Equation, Applied Hydrology by Chow, 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 = 1.97 cfs
II. Sizing the Forebay
Forebay Area , Aforebay = 0.2%(A;mp.), ftz
A;mp. =Contributing impervious area, ft2
A;mp_ = 56358.79 ft2
z
Aforebay = 112.72 ft
III. Determine Level Spreader Length 8r Slope Check
**Choose one of the following, a-d
Level Spreader Design 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 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 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.u,s-Elev.p,s]/L, ft/ft
Elev.u,s =Elevation at level spreader, ft
Elev.o,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.u,s = 209.15 ft
Elev.ps = 205.75 ft
L = 71.54 ft
s = 0.0475 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-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 (fUft)
L = 1206.9 ft
H = 70.0 ft
S = 0.058 ft/ft
T~ = 5.51 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 concentration, T~
TABLE 1. INPUT
Location: Taft Woods East
Duration: 2 yr
(in)
5 min 0.48
15 min 1.03
60 min 1.83
24 hr 3.70
100 yr Source
(in)
0.81 NOAH Hydro 35
1.88 NOAH Hydro 35
3.80 NOAA Hydro 35
8.30 USWB TP 40
TABLE 2. DEPTH -DURATION -FREQUENCY
Duration 2 yr 10 yr 100 yr
H-1 * (in) (in) (in)
5 min * 0.48 0.60 0.81
10 min 0.81 1.05 1.44
15 min * 1.03 1.36 1.88
30 min 1.42 1.97 2.82
60 min * 1.83 2.61 3.80
2 hr * 2.04 2.94 4.30
3 hr * 2.24 3.26 4.79
6 hr 2.77 4.09 6.05
12 hr 3.23 4.82 7.18
24 hr * 3.70 5.56 8.30
From Eqs. III-(1-3), p. lll-(4-5), Stormwater Management: Vol.l
Urban Hydrology. B.H.Bradford, N.S.Grigg, L.S. Tucker
T~ = 5.51 min
3. 10-Year Discharge Rate , Quo = 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
Quo = 14.26 cfs
TABLE 3. INTENSITY -DURATION -FREQUENCY
2 yr 10 yr 100 yr
Duration (in/hr) (in/hr) (in/hr)
5 min 5.80 7.22 9.68
10 min 4.83 6.28 8.64
15 min 4.12 5.42 7.52
30 min 2.84 3.94 5.64
60 min 1.83 2.61 3.80
2 hr 1.02 1.47 2.15
3 hr 0.75 1.09 1.60
6 hr 0.46 0.68 1.01
12 hr 0.27 0.40 0.60
24 hr 0.15 0.23 0.35
Intensity =Depth /Time
Page 2 DA 1

V. Bypass Channel Specifications
1. Calculated Depth of Flow using Normal-Depth Procedure
s =Channel slope = [Elev.~~s-Elev.p~s]/L, ft/ft
Elev.~~s =Elevation at level spreader, ft
Elev.p~s =Elevation at stream bank, ft
L =Length of channel from level spreader to stream, ft
Elev.~~s = 209 ft
Elev.p~s = 204 ft
L = 84.23 ft
s = 0.0594 ft/ft
2. Bypass Channel Dimensions (for trapezoidal channel)
a) Cross-sectional Area, Ax = Q~o/Va, ftz
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 to the NC Erosion &
Sediment Control Planning and Design Manual table 8.05a for a Bermudagrass lined channel
Quo = 14.26 cfs
Va = 5 fps
AX = 2.85 ft
b) Working Constant, w~ = M - 2*y(1+Mz]
M =Side slope ratio (H:V)
M = 3 H:1V
w~ _ -3.32 (will always be negative)
c) Working Constant, wz = AX/[[(Va*n)/(1.49,~s)]3~z]
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 = 2.85 ftz
Va = 5 fpS
n = 0.030
s = 0.0594 ft/ft
wz = 10.73
d) Depth of Flow, d = [-wz + y(wzz+4wiAX)]/2w~, ft
w~ =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 (H:V)
Ax = 2.85 ftz
d = 0.292 ft
M = 3 H:1V
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
M =Side slope ratio (H:V)
B = 8.89 ft
d = 0.292 ft
M= 3 H:1V
t = 10.64 ft
3. Velocity Check
a) Wetted Perimeter, P = B+2dy{MZ+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:1 V
P = 10.73 ft
b) Hydraulic Radius, R = A/P
AX =Channel cross-sectional area, ft2
P =Wetted Perimeter, ft
AX = 2.85 ft2
P = 10.73 ft
R = 0.266 ft
t
d ~1
M
N--- B -~
c) Bypass Channel Velocity, v = (1.49/n)'Ry3*S'~2, 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 pereimeter (P), ft
s =Channel slope, ft/ft
n = 0.030
R = 0.266 ft
s = 0.059 ft/ft
V = 5.00 fps
Check: Velocity is within allowable maximum velocity for Bermudagrass lining. A temporary lining of erosion control
matting will be used for stabilization until grass is established.
d) For this depth, the resulting shear stress is then:
Shear Stress , T = yds, Ib/ft2
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/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 = Cd'A*(2`g*h)I'~Zi
a) Pipe Cross-sectional Area , A - [1d4]d2, ft2
pipe -
d =Diameter of pipe from forebay to flow splitter, in
d = 8 inches
Apipe = 0.3489 ~
Page 4
DA 1

b) Head Above Bypass Pipe , h = [(Q/(Cd*A))Z]/2*g, ft
(solving for head above pipe that will be equal to the 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]
P4,;P8 =Pipe cross-sectional area, ftZ
g =Gravitational acceleration, ft/s2
h =Height of water above the orifice (head), ft
Q = 1.97 cfs
Ca = 0.6
AP;Pe = 0.3489 ft`
9 = 32.2 ft/s2
h= 1.38 ft
VII. Swale Drainage Calculations
The following calculations use Darcy's law 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 of level spreader, ft
L = 128.29 ft
W= 3 ft
A = 384.86 ft2
b) Groundwater Flow, Q = (K*i*A)/43200, cfs Darcy's Law
K = Average coefficient of permeablilty, in/hr [4 in/hr based on Pacolet Loam soils from 0 to 8 inches in depth]
-based on the Johnston County Soil Survey (NRCS)
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 ft2
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 ft2
V = 192.43 ft
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
T,, = 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 underdraln will be necessary.
Page 5 DA 1

Level Spreader Design Spreadsheet
DA #2
Taft Woods
S&EC Project No. 9197.D1
I. Determine Contributing Impervious Area and 1lnlhour 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 (fl2) Area (ac.) % Area Rational C % Area * C
Lots -Impervious (roof, parking, etc.) 7400.32 0.170 13.8% 0.95 0.131
Lots -Forested 0.00 0.000 0.0% 0.15 0.000
Lots -Lawn (maintained grass) 28982.12 0.665 54.0% 0.2 0.108
Impervious (Roads) 6913.90 0.159 12.9% 0.95 0.122
Road Easements (maintained grass) 10386.99 0.238 19.3% 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 area = 53683.34 ft~-
2. Discharge Rate, Q = C*i*A, cfs
Rational Equation, Applied Hydrology by Chow, pp. 497
C =Weighted rational coefficient
i =Rainfall intensity (typical 1 in/hour)
A =Drainage area, ft2
C = 0.400
i = 1.00 in/hour
A = 1.23 acres
Q = 0.49 cfs
II. Sizing the Forebay
ForebayArea, Arorebay = 0.2%(AimP,), ft2
A;mP. =Contributing impervious area, ft2
A;mp. = 14314.22 ft2
ft2
Arorebay = 28.63
III. Determine Level Spreader Length & Slope Check
**Choose one of the following, a-d
a: Grass or thick ground cover vegetation
b: Forested with little/no ground cover vegetation and 50-foot vegetated buffer
c: Forested with little/no ground cover vegetation and 100-foot vegetated buffer
d: Forested with little/no ground cover vegetation and 150-foot vegetated buffer
Cover: b (a, b, c, or d from above)
Total discharge, Q = 0.49 cfs
Length of level spreader = 32.04 ft
Level Spreader Design Guidance by DWQ
'--13 feet of level spreader per 1 cfs of flow
'--65 feet of level spreader per 1 cfs of flow
'--50 feet of level spreader per 1 cfs of flow
'--40 feet of level spreader per 1 cfs of flow
Check: Level spreader is within allowable length requirements of greater than 13 feet and less than 730 feet.
Page 1 DA 2

s =Slope of ground downslope of level spreader = [Elev.u,s-Elev.ps]/L, ft/ft
Elev.u,s =Elevation at level spreader, ft
Elev.o,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.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 Flow (Riprap Lined or Grass Swale)
1. Time of Concentration , T~ = 0.0078*Lo.nS-o.ses 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. 10-Year Storm Intensity, i~o 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
(in)
5 min 0.48
15 min 1.03
60 min 1.83
24 hr 3.70
100 yr Source
(in)
0.81 NOAA Hydro 35
1.88 NOAA Hydro 35
3.80 NOAH Hydro 35
8.30 USWB TP 40
TABLE 2. DEPTH -DURATION -FREQUENCY
Duration 2 yr 10 yr 100 yr
H-1 * (in) (in) (in)
5 min * 0.48 0.60 0.81
10 min 0.81 1.05 1.44
15 min * 1.03 1.36 1.88
30 min 1.42 1.97 2.82
60 min * 1.83 2.61 3.80
2 hr * 2.04 2.94 4.30
3 hr * 2.24 3.26 4.79
6 hr * 2.77 4.09 6.05
12 hr * 3.23 4.82 7.18
24 hr 3.70 5.56 8.30
From Eqs. III-(1-3), p. lll-(4-5), Stormwater Management: Vol.l
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 rational coefficient
i,o =Rainfall intensity associated with 10-year storm, in/hour
A =Drainage area, ftZ
C = 0.400
i~o = 7.22 inlhour
A = 1.23 acres
TABLE 3. INTENSITY -DURATION -FREQUENCY
2 yr 10 yr 100 yr
Duration (in/hr) (in/hr) (in/hr)
5 min 5.80 7.22 9.68
10 min 4.83 6.28 8.64
15 min 4.12 5.42 7.52
30 min 2.84 3.94 5.64
60 min 1.83 2.61 3.80
2 hr 1.02 1.47 2.15
3 hr 0.75 1.09 1.60
6 hr 0.46 0.68 1.01
12 hr 0.27 0.40 0.60
24 hr 0.15 0.23 0.35
Intensity = Depth /Time
Page 2 DA 2

Quo = 3.56 cfs
V. Bypass Channel Specifications
1. Calculated Depth of Flow using Normal-Depth Procedure
s =Channel slope = [Elev.urs-Elev.ors]/L, ft/ft
Elev.u~ =Elevation at level spreader, ft
Elev.ors =Elevation at stream bank, ft
L =Length of channel from level spreader to stream, ft
Elev.urs = 234.39 ft
Elev.prs = 230.86 ft
L = 65.07 ft
s = 0.0542 ft/ft
2. Bypass Channel Dimensions (for trapezoidal channel)
a) Cross-sectional Area, AX = Q~o/Ve, ft2
Quo = 10-year design flow, cfs
Ve =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 Bermudagrass lined channel
Quo = 3.56 cfs
Va = 3.4 fps
AX = 1.05 ~
b) Working Constant, w~ = M - 2*~{1+M2]
M =Side slope ratio (H:V)
M = 3 H:1V
w~ _ -3.32 (will always be negative)
c) working constant, w2 = Ax/[[(Va*n)/(1.49,~)]3rZ]
AX =Channel cross-sectional area, ft2
Ve = 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 ft2
Ve = 4.5 fps
n = 0.030
s = 0.0542 ft/ft
w2 = 4.32
d) Depth of Flow, d = [-w2 + „(wZ2+4w~AX)]/2w~, ft
w~ =Working constant
w2 =Working constant
Ax =Channel cross-sectional area, ft2
w~ _ -3.32
w2 = 4.32
Ax = 1.05 ft2
d = 0.323 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 = 1.05 ft2
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 channel, ft
d =Depth of flow, ft
M =Side slope ratio (H:V)
B = 2.27 ft
d = 0.323 ft
M = 3 H:1V
t = 4.21 ft
3. Velocity Check
a) Wetted Perimeter, P = B+2dy{MZ+1], ft
B =Bottom width of channel, ft
d =Depth of flow, 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, ft2
P =Wetted Perimeter, ft
Ax = 1.05 ft2
P = 4.32 ft
R = 0.243 ft
H~ t
d ~1
M
~~--- B -~
c) Bypass Channel Velocity, v = (1.49/n)*Rti3*S~~2, 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 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 stabilization until grass is established.
d) For this depth, the resulting shear stress is then:
Shear Stress , T = yds, Ib/ft2
y =Unit weight of water, 62.4 Ib/ft3
d= Flow depth, ft
s =Channel gradient, ft/ft
y = 62.40 Ib/ft3
d = 0.32 ft
s = 0.054 fUft
T = 1.1 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 = Cd*A*(2*g*h)~'~~1
a) Pipe Cross-sectional Area , A - [n/4]d2, ft2
pipe -
d =Diameter of pipe from forebay to flow splitter, in
Page 4 DA 2

d = 4 inches
A ~ - 0.0872 ftz
P~Pe
b) Head Above Bypass Pipe , h = [(Q/(Cd*A))Z]/2*g, ft
(solving for head above pipe that will be equal to the 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]
AP;PB =Pipe cross-sectional area, ft2
g =Gravitational acceleration, ft/s2
h =height of water above the orifice (head), ft
Q = 0.49 cfs
Cd = 0.6
AP;~ = 0.0872 ft`
g = 32.2 ft/s2
h= 1.38 ft
VII. Swale Drainage Calculations
The following calculations use Darcy's law to calculate the time (in hours) that it will take for the swale
upslope of the level spreader fo 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 of level spreader, ft
L = 32.04 ft
W= 3 ft
A = 96.12 ft
b) Groundwater Flow, Q = (K*i*A)/43200, cfs Darcy's Law
K = Average coefficient of permeablilty, in/hr [1.3 in/hr based on Pacolet Loam soils from 5 to 25 inches in depth]
based on the Johnston County Soil Survey (NRCS)
i =Hydraulic gradient [assumed to equal 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) 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 = 96.12 ft2
V = 48.06 ft
d) Time to Drain the Swale = V/Q, sec
V =Volume drained, ft3
Q =Groundwater flow, cfs
V = 48.06 ft3
Q = 0.0029 cfs
Td = 16615 s
Td = 4.62 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 underdraln will be necessary.
Page 5 DA 2

Level Spreader Design Spreadsheet
DA #3
Taft Woods
S&EC Project No. 9197.D1
I. Determine 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 = 13.78 acres
Development Area (ftZ) Area (ac.) % Area Rational C % Area * C SCS Curve # % Area * Curve #
Lots -Impervious (roof, parking, etc.) 74992.63 1.722 12.5% 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, C = 0.352
impervious drainage area = 122653.14 ft2
total drainage area = 600437.86 ft2
2. Discharge Rate , Q = C*i*A, cfs
Rational Equation, Applied Hydrology by Chow, pp. 497
C =Weighted rational coefficient
i =Rainfall intensity
A =Drainage area, ft2
C = 0.352
i = 1.00 in/hour
A = 13.78 acres
Q = 4.86 cfs
III. Determine Level Spreader Length 8 Slope Check
**Choose one of the following, a-d
Level Soreader Desion 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 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 feet of level spreader per 1 cfs of flow
Cover: b (a, b, c, or d from above)
Total discharge, Q = 4.86 cfs
length of level spreader = 315.76 ft
Check: LEVEL SPREADER LENGTH HAS EXCEEDED MAXIMUM ALLOWABLE LENGTH, 130 FEET. SEE SECTION VI.
s =Slope of ground downslope of level spreader = [Elev.~~s-Elev.o~s]/L, ft/ft
Elev.~~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.u~s = 183 ft
Elev.p~s = 180 ft
L = 65 ft
s = 0.0462 ft/ft
Check: Slope is less than 6%.
Page 1 DA 3

IV. Hydrology Data
1. Time of Concentration , T~ = 0.0078*Lo.77S-0.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 = 1381.6 ft
H = 73.0 ft
S = 0.053 fUft
T~ = 6.34 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 concentration, T~
TABLE 1. INPUT
Location: Taft Woods East
Duration: 2 yr
(in)
5 min 0.48
15 min 1.03
60 min 1.83
24 hr 3.70
100 yr Source
(in)
0.81 NOAA Hydro 35
1.88 NOAA Hydro 35
3.80 NOAA Hydro 35
8.30 USWB TP 40
TABLE 2. DEPTH -DURATION -FREQUENCY
Duration 2 yr 10 yr 100 yr
H-1 * (in) (in) (in)
5 min * 0.48 0.60 0.81
10 min 0.81 1.05 1.44
15 min * 1.03 1.36 1.88
30 min 1.42 1.97 2.82
60 min * 1.83 2.61 3.80
2 hr * 2.04 2.94 4.30
3 hr * 2.24 3.26 4.79
6 hr * 2.77 4.09 6.05
12 hr * 3.23 4.82 7.18
24 hr * 3.70 5.56 8.30
From Eqs. III-(1-3), p.l ll-(4-5), Stormwater Management: Vol.l
Urban Hydrology. B.H.Bradford, N.S.Grigg, L.S. Tucker
T~ = 6.34 min
3. 10-Year Discharge Rate, Oro = 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 = 0.352
i~o = 7.22 in/hour
A = 13.78 acres
Oro = 35.09 cfs
TABLE 3. INTENSITY -DURATION -FREQUENCY
2 yr 10 yr 100 yr
Duration (in/hr) (in/hr) (in/hr)
5 min 5.80 7.22 9.68
10 min 4.83 6.28 8.64
15 min 4.12 5.42 7.52
30 min 2.84 3.94 5.64
60 min 1.83 2.61 3.80
2 hr 1.02 1.47 2.15
3 hr 0.75 1.09 1.60
6 hr 0.46 0.68 1.01
12 hr 0.27 0.40 0.60
24 hr 0.15 0.23 0.35
Intensity =Depth /Time
V. Wet Detention Pond Sizing
The 1 in/hr flow for this drainage area (and any resonable 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 outlet the discharge associated with the
maximum level spreader length (130 feet, in this case). The wet detention basin will have a permanent pool. Above this elevation,
the detention basin has been designed with enough storage volume to store the 10-yr event and discharge this volume to the level
spreader at the rate associated with the maximum level spreader length. Based on this design, no bypass channel, flow splitter, 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 caculate the volume of runoff from the 10-yr
storm.
Solving for V (volume of runoff in ft3 that must be controlled for the design storm) the Simple Method is:
V = 3630*Rd*Rv*A
Page 2 DA 3

Where:
Rd =Design storme rainfall - in this case 1.05 in based on table 2 above rounding up to 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*la
Where la =the imperious fraction = (the impervious portion of the drainage area) / (the total drainage area)
Therefore:
la = 0.20
Rv = 0.23
V = 12,183.05 ft3
This storage is less than the storage provided between the permenant pool elevation 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. Wet 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 allowable
level spreader length of 130 feet, in this case. (For forested with little or no ground cover and a 50 foot 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 orifice in the riser that outlets to the barrel to the level spreader:

Q =Discharge - in this case it will be set to 2 cfs
Cd =Discharge coefficient = 0.6
A =Area of orifice draining the wet pond, ftz
g =Acceleration due to gravity, fUs/s
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 = 0.24 ft
d = 0.55 ft (diameter of circular orifice)
d = 6.63 in
VII. Wet detention Pond Outlet Barrel Sizing
Outflow Pipe Diameter, D~°„ = 16*[(O*n)/~]13~81, (ft)
Q =Flow to level spreader, (2 cfs)
n = Manning's roughness coefficient
s =internal slope (recommended minumum 0.5%)
Quo = 2.00 cfs
n = 0.012 for HDPE CPP double wall, smooth interior
s = 0.50%
Dr°u = 10.67 inches
Based on this, the Outlet Barrel will be specified with a 12 inch diameter.
VIII. Swale Drainage Calculations
The following calculations use Darcy's law 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, ftz
L =Level spreader length, ft
W =Width of swale upslope of level spreader, ft
L = 130.00 ft
W= 3 ft
A = 390.00 ftz
Page 3 DA 3

b) GroundwaterFlow, Q = (K*i*A)/43200, cfs Darcy's Law
K = Average coefficient of permeablilty, in/hr [4 in/hr based on Wehadkee Loam soils from 0 to 7 inches in depth]
based on the Johnston County Soil Survey (NRCS)
i =Hydraulic gradient [assumed to equal 1]
A =Surface area draining to in-situ soil, ftZ
K = 4 in/hr
i= 1
A = 390.00 ftZ
Q = 0.0361 cfs
c) Volume 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 = 390.00 ft`
V = 195.00 ft3
d) Time to Drain the Swale = V/Q, sec
V =Volume drained, ft3
Q =Groundwater flow, cfs
V = 195.00 ft3
Q = 0.0361 cfs
Td = 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.
IX. Spillway Channel Design Hydrology
-The emergency spillway is sized to convey the 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 Intensity, i~oo based on Intensity-Duration-Frequency (IDF) Table from Section IV.2
i~oo = 100-year intensity that occurs at the time of concentration, T~
T~ = 6.34 min
i~oo = 9.68 in/hour
b) 100-Year Discharge Rate, Q,o = C*i~o*A, cfs
C =Weighted rational coefficient
i~oo =Rainfall intensity associated with 100-year storm, in/hour
A =Drainage area, ft2
C = 0.352
iioo = 9.68 in/hour
A = 13.78 acres
Qioo = 47.04 cfs
X. Calculated Depth of Flow using Normal-Depth Procedure
a) s =Channel slope = [Elev.u~s-Elev.p~s]/L, ft/ft
Elev.u~s =Upstream reference elevation, ft
Elev.p~s =Upstream reference elevation, ft
L =Length of channel from upstream to dowstream, ft
Elev.u~s = 191 ft
Elev.o~s = 185 ft
L = 57 ft
s = 0.1053 fUft
Page 4 DA 3

b) A =Trapezoidal channel area = W*d + Mdz, ftz
P =Wetted perimeter = W + 2d, ft
R =Hydraulic radius = A/P, ft
W =Bottom width of channel, ft
d =Channel depth, ft
M =Side slope ratio (H:V)
Rearranged Manning's Equation: AR213 = Qn/[1.49*,~]
Q~oo =Design flow over spillway, cfs
n = Manning's roughness coefficient
s =Channel slope
Q~oo = 47.04 cfs M =
n = 0.033 for riprap-lined channel
s = 0.1053 ft/ft
Qn/[1.49*,~] = 3.211
**need to find d so that AR~~' = Qn/[1.49*,~]
d W A P R ARzis
1 20 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
0.325 20 6.82 20.65 0.330 3.256
0.3224 20 6.76 20.6448 0.327 3.211
Based on this calculated depth, the emergency spillway will pass the
100 year event without overtopping since its design depth is 1.0 feet
XI. Shear Stress Calculations
b) Channel shear stress, Tch. - YHZO*d*S~h., Ib/ftz
YHZO =Unit weight of water, Iblft3
d =Channel depth, ft
Soh. =Channel slope, fUft
YHZO = 62.4 Ib/ft'
d = 0.322 ft
Sin. = 0.1053 ft/ft
Ton. = 2.118 Ib/ftz
3 H:1V
Actual Channel dimensions:
W = 20 ft
d = 1.000 ft
According to Table 8.05g of the NCDENR Erosion and Sediment Control Manual, this is a
permissable shear stress for a riprap liner with a dso of 9 inches or greater.
This corresponds with Class 1 Rip Rap as defined in Table 1042-1 of the NCDOT Standard
Specifiactions for Roads and Structures, 2002.
Page 5 DA 3

STAGE-STORAGE RELATIONSHIP STA-STO.W82 J.L.E. VER. OS-97, P.K.S. MOD. 09-02, P.K.S. MOD. 08-06
Taft Woods Drainage Area #3
S&EC Project No. 9197.D1 Wet Detention Basin
STORAGE ABOVE PERMENANT POOL
SUMMARY EQUATION:
S=KsZb
where: S =Storage Volume, ft.3
Z =Stage above Invert, ft.
Ks is defined by regression output
b is defined by regression output
Regression Output:
Constant 10.007
X Coefficient(s) 1.084
Incremental Storage
Contour Area Z AREA dH Volume (Acc. Vol.). S
Ks
22185
b
1.08
Computed Computed
(Elev.) (Acres) (feet) (ftz) (ft.) (ft3) (ft) (ft3)
189.0 0.47 0.0 20433
190.0 0.55 1.0 23938 1 22185 22185 0.000 10.007 22,185 10.007
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&EC Project No. 9197.D1
1. Determine Contributing Impervlous 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 = 1.11 acres
Development Area (ft2) Area (ac.) % Area Rational C % Area * C
Lots -Impervious (roof, parking, etc.) 3242.99 0.074 6.7% 0.95 0.064
Lots -Forested 1050.00 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 Easements (maintained grass) 11687.00 0.268 24.1% 0.2 0.048
total: 48413.49 1.111 0.402
weighted rational coefficient, C = 0.402
impervious drainage area = 13140.11 ft2
total drainage area = 48413.49 ft2
2. Discharge Rate , Q = C*i*A, cfs
Rational Equation, Applied Hydrology by Chow, pp. 497
C =Weighted rational coefficient
i =Rainfall intensity
A =Drainage area, ft2
C = 0.402
i = 1.00 in/hour
A = 1.11 acres
Q = 0.45 cfs
II. Sizing the Forebay
Forebay Area , Arorabay = 0.2%(A;mP.), ftz
A;mP. =Contributing impervious area, ft2
A;mP. = 13140.11 ft2
ft2
Aforebay = 26.28
III. Determine Level Spreader Length & Slope Check
**Choose one of the following, a-d
a: Grass or thick ground cover vegetation
b: Forested with little/no ground cover vegetation and 50-foot vegetated buffer
c: Forested with little/no ground cover vegetation and 100-foot vegetated buffer
d: Forested with little/no ground cover vegetation and 150-foot vegetated buffer
Cover: b (a, b, c, or d from above)
Total discharge, Q = 0.45 cfs
Length of level spreader = 29.08 ft
Level Spreader Design Guidance by DWQ
'--13 feet of level spreader per 1 cfs of flow
'--65 feet of level spreader per 1 cfs of flow
'--50 feet of level spreader per 1 cfs of flow
'--40 feet of level spreader per 1 cfs of flow
Check: Level spreader is within 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.u~s-Elev.p~s]/L, ft/ft
Elev.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.~~s = 178.38 ft
Elev.o~s = 177.24 ft
L = 55.59 ft
s = 0.0204 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-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 = 698.0 ft
H = 30.0 ft
S = 0.043 ft/ft
T~ = 4.06 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 concentration, T~
TABLE 1. INPUT
Location: Taft Woods East
Duration: 2 yr
(in)
5 min 0.48
15 min 1.03
60 min 1.83
24 hr 3.70
100 yr Source
(in)
0.81 NOAA Hydro 35
1.88 NOAH Hydro 35
3.80 NOAH Hydro 35
8.30 USWB TP 40
TABLE 2. DEPTH -DURATION -FREQUENCY
Duration 2 yr 10 yr 100 yr
H-1 * (in) (in) (in)
5 min * 0.48 0.60 0.81
10 min 0.81 1.05 1.44
15 min * 1.03 1.36 1.88
30 min 1.42 1.97 2.82
60 min * 1.83 2.61 3.80
2 hr * 2.04 2.94 4.30
3 hr * 2.24 3.26 4.79
6 hr * 2.77 4.09 6.05
12 hr * 3.23 4.82 7.18
24 hr 3.70 5.56 8.30
From Eqs. III-(1-3), p. lll-(4-5), Stormwater Management: Vol.l
Urban Hydrology. B.H.Bradford, N.S.Grigg, L.S. Tucker
T~ = 5.00 min
3. 10-Year Discharge Rate, Oro = C*i~o*A, cfs
C =Weighted rational coefficient
i~o =Rainfall intensity associated with 10-year storm, in/hour
A =Drainage area, ftz
C = 0.402
iio = 7.22 in/hour
A = 1.11 acres
Oro = 3.23 cfs

TABLE 3. INTENSITY -DURATION -FREQUENCY
2 yr 10 yr 100 yr
Duration (in/hr) (in/hr) (iNhr)
5 min 5.80 7.22 9.68
10 min 4.83 6.28 8.64
15 min 4.12 5.42 7.52
30 min 2.84 3.94 5.64
60 min 1.83 2.61 3.80
2 hr 1.02 1.47 2.15
3 hr 0.75 1.09 1.60
6 hr 0.46 0.68 1.01
12 hr 0.27 0.40 0.60
24 hr 0.15 0.23 0.35
Intensity =Depth /Time
Page 2
DA 4

V. Bypass Channel Specifications
1. Calculated Depth of Flow using Normal-Depth Procedure
s =Channel slope = [Elev.c~s-Elev.p~s]/L, ft/ft
Elev.~~s =Elevation at level spreader, ft
Elev.p~s =Elevation at stream bank, ft
L =Length of channel from level spreader to stream, ft
Elev.~~s = 178.1 ft
Elev.o~s = 176.7 ft
L = 54.92 ft
s = 0.0255 ft/ft
2. Bypass Channel Dimensions (for trapezoidal channel)
a) Cross-sectional Area, AX = Q~o/Ve, 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 to the NC Erosion &
Sediment Control Planning and Design Manual table 8.05a for a Bermudagrass lined channel
Quo = 3.23 cfs
Ve = 3.1 fps
Ax = 1.04 ft2
b) working constant, w~ = M - 2*~[1+M2]
M =Side slope ratio (H:V)
M = 3 H:1V
w~ _ -3.32 (will always be negative)
c) working constant, w2 = AX/[[(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 Hydrology by Chow, Table 2.5.1, pp. 35)]
s =Channel slope, ft/ft
AX = 1.04 ftZ
Va = 3.1 fps
n = 0.030
s = 0.0255 ft/ft
w2 = 4.26
d) Depth of Flow, d = [-w2 +,~{wz2+4w,Ax)]/2w~, ft
w, =Working constant
w2 =Working constant
AX =Channel cross-sectional area, ft2
w~ _ -3.32
wz = 4.26
A, = 1.04 ~
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 channel, t = B+(2*d*M), 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
t = 4.16 ft
3. Velocity Check
a) Wetted Perimeter, P = B+2d,~[Mz+1], 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
~ t
d ~1
M
~- B -~
c) Bypass Channel Velocity, v = (1.49/n)*Rti3*S'~z, 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 pereimeter (P), ft
s =Channel slope, fUft
n = 0.030
R = 0.244 ft
s = 0.025 ft/ft
V = 3.10 fps
Check: Velocity is within allowable maximum velocity for Bermudagrass lining. 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, Ib/ftz
y =Unit weight of water, 62.4 Ib/ft3
d= Flow depth, ft
s =Channel gradient, ft/ft
y = 62.40 Iblft3
d = 0.33 ft
s = 0.025 ft/ft
T = 0.5 Ib/ftz
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 8.05g.
VI. Flow Splitter (Forebay) Specifications
Using the orifice equation, Q = Cd*A*(2*g*h)~'~zi
a) Pipe Cross-sectiona/Area, Ap;pe = [a/4]dz, ftz
d =Diameter of pipe from forebay to flow splitter, in
d = 4 inches
Apipe = 0.0872 ftz
Page 4
DA 4

b) Head Above Bypass Pipe, h = [(Q/(Cd*A))2]/2*g, ft
(solving for head above pipe that will be equal to the 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]
AP;PB =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
AP;ve = 0.0872 ft`
g = 32.2 ft/sz
h= 1.13 ft
VII. Swale Drainage Calculations
The following calculations use Darcy's law to calculate the time (in hours) that it will take for the swa/e
upslope of the level spreader to naturally drain based on the permeability of the in-situ soils.
a) Sun`ace Area Draining to In-Situ Soil , A = L*W, ftZ
L =Level spreader length, ft
W =Width of Swale upslope of level spreader, ft
L = 29.08 ft
W= 3 ft
A = 87.23 ft2
b) Groundwater Flow, Q = (K*i*A)/43200, cfs Darcy's Law
K = Average coefficient of permeablilty, in/hr [4 in/hr based on Wehadkee Loam soils from 0 to 7 inches in depth]
based on the Johnston County Soil Survey (NRCS)
i =Hydraulic gradient [assumed to equal 1]
A =Surface area draining to in-situ soil, ft2
K = 4 in/hr
i= 1
A = 87.23 ft2
Q = 0.0081 cfs
c) Volume Draining to !n-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 = 87.23 ftz
V = 43.61 ft
d) Time to Drain the Swale = V/Q, sec
V =Volume drained, ft3
Q =Groundwater flow, cfs
V = 43.61 ft3
Q = 0.0081 cfs
Td = 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 4

Level Spreader Design Spreadsheet
DA #5
Taft Woods
S&EC Project No. 9197.D1
I. Determine Contributing Impervious Area and 11n/hour Discharge Rate
1. Weighted Rational Coe~cient, C = E[C;*%A;]
C =Rational coefficient for development area
A =Area
Total Drainage Area = 0.93 acres
Development Area (flz) 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 0.216 23.2% 0.2 0.046
impervious (Roads) 13091.83 0.301 32.3% 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 ft`
total drainage area = 40522.04 ft~
2. Discharge Rate, Q = C*i*A, cfs
Rational Equation, Applied Hydrology by Chow, pp. 497
C =Weighted rational coefficient
i =Rainfall intensity
A =Drainage area, ftz
C = 0.465
i = 1.00 in/hour
A = 0.93 acres
Q = 0.43 cfs
II. Sizing the Forebay
Forebay Area , Aforabay = 0.2%(A;mP.), ~
A;mP. =Contributing impervious area, ftz
AimP. = 14333.64 ftz
z
Aforebay = 28.67 ft
III. Determine Level Spreader Length 8r Slope Check
**Choose one of the following, a-d
a: Grass or thick ground cover vegetation
b: Forested with little/no ground cover vegetation and 50-foot vegetated buffer
c: Forested with little/no ground cover vegetation and 100-foot vegetated buffer
d: Forested with little/no ground cover vegetation and 150-foot vegetated buffer
Cover:
Total discharge, Q =
(a, b, c, or d from above)
0.43 cfs
Length of level spreader = 28.13 ft
Level Spreader Design Guidance by DWQ
'--13 feet of level spreader per 1 cfs of flow
'--65 feet of level spreader per 1 cfs of flow
'--50 feet of level spreader per 1 cfs of flow
'--40 feet of level spreader per 1 cfs of flow
Check: Level spreader is within allowable length requirements of greater than 13 feet and less than 130 feet.
Page 1 DA 5

s =Slope of ground downslope of level spreader = [Elev.~~s-Elev.p~s]/L, ft/ft
Elev.u~s =Elevation at level spreader, ft
Elev.o~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.~~s = 189.22 ft
Elev.p~s = 185.91 ft
L = 76.91 ft
s = 0.0430 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-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 = 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 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) (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 (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 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
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 rational coefficient
i~o =Rainfall intensity associated with 10-year storm, in/hour
A =Drainage area, ftz
C = 0.465
i,o = 7.22 in/hour
A = 0.93 acres
Q,o = 3.13 cfs
Page 2 DA 5

V. Bypass Channel Specifications
1. Calculated Depth of Flow using Normal-Depth Procedure
s =Channel slope = [Elev.u~s-Elev.p~s]/L, ft/ft
Elev.~~s =Elevation at level spreader, ft
Elev.p~s =Elevation at stream bank, ft
L =Length of channel from level spreader to stream, ft
Elev.~~s = 190.4 ft
Elev.p~s = 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,olVe, ftz
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 to the NC Erosion &
Sediment Control Planning and Design Manual table 8.05a for a Bermudagrass lined channel
Quo = 3.13 cfs
Ve = 3.5 fps
Auu = 0.89 ftz
b) Working Constant, w~ = M - 2*v{1+Mz]
M =Side slope ratio (H:V)
M = 3 H:1 V
w~ _ -3.32 (will always be negative)
c) Working Constant, wz = AX/[[Ne*n)/(1.49,~)]3"z]
AX =Channel cross-sectional area, ftz
Ve =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 = Channei slope, ft/ft
AX = 0.89 ftz
Va = 3.5 fps
n = 0.030
s = 0.0376 ft/ft
wz = 4.08
d) Depth of Flow, d = [-wz + y(wzz+4w~Ax)]/2w~, ft
w~ =Working constant
wz =Working constant
AX =Channel cross-sectional area, ftz
w~ _ -3.32
wz = 4.08
AX = 0.89 ftz
d = 0.286 ft
e) Bottom Width of Channel, B = A,/d - M*d, ft
AX =Channel cross-sectionai area, ftz
d =Depth of flow, ft
M =Side slope ratio (H:V)
AX = 0.89 ftz
d = 0.286 ft
M = 3 H:1 V
B = 2.27 ft
Page 3 DA 5

f) Top Width of Channel, t = B+(2*d*M), ft
B =Bottom width of channel, ft
d =Depth of flow, ft
M =Side slope ratio (H:V)
B = 2.27 ft
d = 0.286 ft
M = 3 H:1V
t = 3.98 ft
3. Velocity Check
a) Wetted Perimeter, P = 6+2dV(MZ+1], ft
B =Bottom width of channel, ft
d =Depth of flow, ft
M =Side slope ratio (H:V)
B = 2.27 ft
d = 0.286 ft
M= 3 H:1V
P = 4.08 ft
b) Hydraulic Radius, R = A/P
AX =Channel cross-sectional area, ftZ
P =Wetted Perimeter, ft
Ax = 0.89 ftZ
P = 4.08 ft
R = 0.219 ft
~ t
d ~1
M
h~-B~
c) Bypass Channel Velocity, v = (1.49/n)*Rv3*S~~Z, fps
'-velocity must be less than 5 fps according to E8~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 pereimeter (P), ft
s =Channel slope, 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 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, Ib/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 = 0.29 ft
s = 0.038 ft/ft
T = 0.7 I blftZ
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 8.05g.
VI. Flow Splitter (Forebay) Specifications
Using the orifice equation, Q = Cd*A*(2*g*h)I'~ZI
a) Pipe Cross-sectional Area , A - [x/4]dZ, ftZ
pipe -
d =Diameter of pipe from forebay to flow splitter, in
d = 4 inches
Apipe = 0.0872 ft2
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 equal to the 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]
Aniue =Pipe cross-sectional area, ftz
g =Gravitational acceleration, ft/sz
h =Height of water above the orifice (head), ft
Q = 0.43 cfs
Ca = 0.6
AP~Pe = 0.0872 ft`
g = 32.2 ft/s2
h= 1.06 ft
VII. Swale Drainage Calculations
The following calculations use Darcy s law 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 of level spreader, ft
L = 28.13 ft
W= 3 ft
A = 84.40 ft
b) Groundwater Flow, Q = (K*i*A)/43200, cfs Darcy's Law
K = Average coefficient of permeabiiity, in/hr [4 in/hr based on Pacolet Loam soils from 0 to 8 inches in depth]
based on the Johnston County Soil Survey (NRCS)
i =Hydraulic gradient [assumed to equal 1]
A =Surface area draining to in-situ soil, ftZ
K = 4 in/hr
i= 1
A = 84.40 ftZ
Q = 0.0078 cfs
c) Volume 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 = 84.40 ftZ
V = 42.20 ft
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
Td = 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 5

Level Spreader Design Spreadsheet
DA #6
Taft Woods
S&EC Project No. 9197.D1
I. Determine Contributing Impervious Area and 1inlhour Discharge Rate
1. Weighted Rational Coefficient, C = F[Ci*%A;]
C =Rational coefficient for development area
A =Area
Total Drainage Area = 1.62 acres
Development Area (ft2) 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 (maintained grass) 36199.08 0.831 51.2% 0.2 0.102
total: 70658.06 1.622 0.481
weighted rational coefficient, C = 0.481
im_ pervious drainage area = 26463.35 ft2
total drainage area = 70658.06 ft2
2. Discharge Rate , Q = C*i*A, cfs
Rational Equation, Applied Hydrology by Chow, pp. 497
C =Weighted rational coefficient
i =Rainfall intensity
A =Drainage area, ftZ
C = 0.481
i = 1.00 in/hour
A = 1.62 acres
Q = 0.78 cfs
II. Sizing the Forebay
Forebay Area , Af°rebay = 0.2%(Aimp.), ft2
A;mp. =Contributing impervious area, ft2
Aimp. = 26463.35 ft2
z
Atorebay = 52.93 ft
III. Determine Level Spreader Length & Slope Check
**Choose one of the following, a-d
a: Grass or thick ground cover vegetation
b: Forested with little/no ground cover vegetation and 50-foot vegetated buffer
c: Forested with little/no ground cover vegetation and 100-foot vegetated buffer
d: Forested with little/no ground cover vegetation and 150-foot vegetated buffer
Cover:
Total discharge, Q =
(a, b, c, or d from above)
0.78 cfs
Length of level spreader = 50.70 ft
Level Spreader Desion Guidance by DWQ
'--13 feet of level spreader per 1 cfs of flow
'--65 feet of level spreader per 1 cfs of flow
'--50 feet of level spreader per 1 cfs of flow
'-40 feet of level spreader per 1 cfs of flow
Check: Level spreader 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.~rs-Elev.ors]/L, ft/ft
Elev.urs =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 level spreader to stream (or edge of 50' buffer or filter strip), ft
Elev.urs = 193.53 ft
Elev.prs = 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 Concenfration , T~ = 0.0078*Lo.»5-0.365, 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 = 1197.4 ft
H = 67.0 ft
S = 0.056 ft/ft
T~ = 5.55 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 concentration, T~
TABLE 1. INPUT
Location: Taft Woods East
Duration: 2 yr
(in)
5 min 0.48
15 min 1.03
60 min 1.83
24 hr 3.70
100 yr Source
(in)
0.81 NOAA Hydro 35
1.88 NOAA Hydro 35
3.80 NOAA Hydro 35
8.30 USWB TP 40
TABLE 2. DEPTH -DURATION -FREQUENCY
Duration 2 yr 10 yr 100 yr
H-1 * (in) (in) (in)
5 min * 0.48 0.60 0.81
10 min 0.81 1.05 1.44
15 min * 1.03 1.36 1.88
30 min 1.42 1.97 2.82
60 min * 1.83 2.61 3.80
2 hr * 2.04 2.94 4.30
3 hr * 2.24 3.26 4.79
6 hr 2.77 4.09 6.05
12 hr 3.23 4.82 7.18
24 hr * 3.70 5.56 8.30
From Eqs. III-(1-3), p. lll-(4-5), Stormwater Management: Vol.l
Urban Hydrology. B.H.Bradford, N.S.Grigg, L.S. Tucker
T~ = 5.55 min
3. 10-Year Discharge Rate, Q,o = C*i~o*A, cfs
C =Weighted rational coefficient
i~o =Rainfall intensity associated with 10-year storm, in/hour
A =Drainage area, ftz
C = 0.481
i~o = 7.22 in/hour
A = 1.62 acres
Qio = 5.63 cfs
Page 2
TABLE 3. INTENSITY -DURATION -FREQUENCY
2 yr 10 yr 100 yr
Duration (in/hr) (in/hr) (in/hr)
5 min 5.80 7.22 9.68
10 min 4.83 6.28 8.64
15 min 4.12 5.42 7.52
30 min 2.84 3.94 5.64
60 min 1.83 2.61 3.80
2 hr 1.02 1.47 2.15
3 hr 0.75 1.09 1.60
6 hr 0.46 0.68 1.01
12 hr 0.27 0.40 0.60
24 hr 0.15 0.23 0.35
Intensity =Depth /Time
DA 6

V. Bypass Channel Specifications
1. Calculated Depth of Flow using Normal-Depth Procedure
s =Channel slope = [Elev.~~s-Elev.p~s]/L, ft/ft
Elev.u~s =Elevation at level spreader, ft
Elev.p~s =Elevation at stream bank, ft
L =Length of channel from level spreader to stream, ft
Elev.u~s = 193.5 ft
Elev.p~s = 188 ft
L = 94 ft
s = 0.0585 ft/ft
2. Bypass Channel Dimensions (for trapezoidal channel)
a) Cross-sectional Area, Ax = Q~olVe, ftz
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 to the NC Erosion &
Sediment Control Planning and Design Manual table 8.05a for a Bermudagrass lined channel
Qio = 5.63 cfs
Ve = 4.8 fps
Ax = 1.17 ftz
b) Working Constant, w~ = M - 2"~,{1+Mz]
M =Side slope ratio (H:V)
M = 3 H:1V
w~ _ -3.32 (will always be negative)
c) Working Constant, wz = Ax/[[(Ve"n)/(1.49~)]3"~]
Ax =Channel cross-sectional area, ftz
Ve =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 = 1.17 ftz
Ve = 4.8 fps
n = 0.030
s = 0.0585 ft/ft
wz = 4.65
d) Depth of Flow, d = [-wz +,~(wzz+4w,Ax)]/2w~, ft
w~ =Working constant
wz =Working constant
Ax =Channel cross-sectional area, ftz
w~ _ -3.32
wz = 4.65
Ax = 1.17 ft2
d = 0.331 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 = 1.17 ftz
d = 0.331 ft
M = 3 H:1V
B = 2.56 ft
Page 3 DA 6

f) Top Width of Channel, t = B+(2"d'M), 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
t = 4.54 ft
3. Velocity Check
a) Wetted Perimeter, P = B+2dy[M2+1], 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, ft2
P =Wetted Perimeter, ft
AX = 1.17 ~
P = 4.65 ft
R = 0.253 ft
~ t
d ~1
M
~~'- B -~
c) Bypass Channel Velocity, v = (1.49/n)*Ry3*S'~2, 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 pereimeter (P), ft
s =Channel slope, ft/ft
n = 0.030
R = 0.253 ft
s = 0.059 ft/ft
V = 4.80 fps
Check: Velocity is within allowable maximum velocity for Bermudagrass lining. 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, Ib/ft2
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 8.05g.
VI. Flow Splitter (Forebay) Specifications
Using the orifice equation, Q = Cd'A*(2"g"h)I'~2i
a) Pipe Cross-sectiona/Area, A - [a/4]d2, ft2
pipe -
d =Diameter of pipe from forebay to flow splitter, in
d = 4 inches
Apipe = 0.0872 ft2
Page 4
DA 6

b) Nead Above Bypass Pipe, h = [(Q/(Cd*A))2]/2*g, ft
(solving for head above pipe that will be equal to the elevation of the bypass channel invert above the pipe fo the level 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/sz
h =height of water above the orifice (head), ft
Q = 0.78 cfs
Cd = 0.6
AP;Pe = 0.0872 ftz
g = 32.2 ft/sz
h= 3.45 ft
VII. Swale Drainage Calculations
The following calculations use Darcys law 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 fo In-Situ Soil , A = L*W, ftz
L =Level spreader length, ft
W =Width of Swale upslope of level spreader, ft
L = 50.70 ft
W= 3 ft
A = 152.11 ftz
b) Groundwater Flow, Q = (K*i*A)/43200, cfs Darcys Law
K = Average coefficient of permeablilty, in/hr [4 in/hr based on Pacolet Loam soils from 0 to 8 inches in depth]
based on the Johnston County Soil Survey (NRCS)
i =Hydraulic gradient [assumed to 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 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 = 152.11 ftz
V = 76.06 ft3
d) Time to Drain the Swale = V/Q, sec
V =Volume drained, ft3
Q =Groundwater flow, cfs
V = 76.06 ft3
Q = 0.0141 cfs
Td = 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 6

Level Spreader Design Spreadsheet
DA #7
Taft Woods
S8~EC Project No. 9197.D1
I. Determine Contributing Impervious Area and 11n/hour Discharge Rate
1. Weighted Rational Coefficient, C = F[C;*%A;]
C =Rational coefFcient for development area
A =Area
Total Drainage Area = 2.80 acres
Development Area (ftz) Area (ac.) % Area Rational C % Area * C
Lots -•Impervious (roof, parking, etc.) 8103.61 0.186 6.6% 0.95 0.063
Lots -Forested 1285.00 0.029 1.1 % 0.15 0.002
Lots -Lawn (maintained grass) 47433.05 1.089 38.9% 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 ft
total drainage area = 121894.6 ft~-
2. Discharge Rate , Q = C*i*A, cfs
Rational Equation, Applied Hydrology by Chow, pp. 497
C =Weighted rational coefficient
i =Rainfall intensity
A =Drainage area, ftz
C = 0.394
i = 1.00 in/hour
A = 2.80 acres
Q = 1.10 cfs
II. Sizing the Forebay
Forebay Area , Ato~abay = 0.2%(A;mp.), ftz
A;mp. =Contributing impervious area, ftz
Aimp. = 31645.45 ftz
z
Ar°~ebar = 63.29 ft
III. Determine Level Spreader Length & Slope Check
**Choose one of the following, a-d
Level Spreader Design 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 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 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: Level spreader is within allowable length requirements of greater than 13 feet and less than 130 feet.
Page 1 DA 7

s =Slope of ground downslope of level spreader = [Elev.u~s-Elev.p~s]/L, ft/ft
Elev.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.uis = 182.22
Elev.o~s = 180.55
L = 82.64
s = 0.0202
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-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 = 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 concentration, T~
TABLE 1. INPUT
Location: Taft Woods East
Duration: 2 yr
(in)
5 min 0.48
15 min 1.03
60 min 1.83
24 hr 3.70
100 yr Source
(in)
0.81 NOAA Hydro 35
1.88 NOAA Hydro 35
3.80 NOAA Hydro 35
8.30 USWB TP 40
TABLE 2. DEPTH -DURATION -FREQUENCY
Duration 2 yr 10 yr 100 yr
H-1 * (in) (in) (in)
5 min * 0.48 0.60 0.81
10 min 0.81 1.05 1.44
15 min * 1.03 1.36 1.88
30 min 1.42 1.97 2.82
60 min * 1.83 2.61 3.80
2 hr 2.04 2.94 4.30
3 hr 2.24 3.26 4.79
6 hr * 2.77 4.09 6.05
12 hr * 3.23 4.82 7.18
24 hr * 3.70 5.56 8.30
From Eqs. III-(1-3), p. lll-(4-5), Stormwater Ma nagement: Vol.l
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 rational coefficient
i~o =Rainfall intensity associated with 10-year storm, in/hour
A =Drainage area, ft2
C = 0.394
i~o = 7.22 in/hour
A = 2.80 acres
Quo = 7.97 cfs
TABLE 3. INTENSITY -DURATION -FREQUENCY
2 yr 10 yr 100 yr
Duration (in/hr) (in/hr) (in/hr)
5 min 5.80 7.22 9.68
10 min 4.83 6.28 8.64
15 min 4.12 5.42 7.52
30 min 2.84 3.94 5.64
60 min 1.83 2.61 3.80
2 hr 1.02 1.47 2.15
3 hr 0.75 1.09 1.60
6 hr 0.46 0.68 1.01
12 hr 0.27 0.40 0.60
24 hr 0.15 0.23 0.35
Intensity = Depth /Time
Page 2
DA 7

V. Bypass Channel Specifications
1. Calculated Depth of Flow using Normal-Depth Procedure
s =Channel slope = [Elev.~,s-Elev.o,s]/L, ft/ft
Elev.~,s =Elevation at level spreader, ft
Elev.p,s =Elevation at stream bank, ft
L =Length of channel from level spreader to stream, ft
Elev.~,s = 182.5 ft
Elev.o,s = 181 ft
L = 65.02 ft
s = 0.0231 ft/ft
2. Bypass Channel Dimensions (for trapezoidal channel)
a) Cross-sectional Area, Ax = Q~o/Va, ftz
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 to the NC Erosion &
Sediment Control Planning and Design Manual table 8.05a for a Bermudagrass lined channel
Quo = 7.97 cfs
Va = 3.7 fps
Ax = 2.15 ft2
b) Working Constant, w~ = M - 2'„{1+Mz]
M =Side slope ratio (H:V)
M = 3 H:1V
w~ _ -3.32 (will always be negative)
c) Working Constant, wz = Ax/[[(Va*n)/(1.49,~)]3"~]
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 = 2.15 ftz
Va = 3.7 fps
n = 0.030
s = 0.0231 ft/ft
wz = 6.27
d) Depth of Flow, d = [-wz + ~wzz+4w~Ax)]/2w,, ft
w~ =Working constant
wz =Working constant
Ax =Channel cross-sectional area, ftz
w~ _ -3.32
wz = 6.27
Ax = 2.15 ft2
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 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
t = 6.12 ft
3. Velocity Check
a) Wetted Perimeter, P = 8+2d,~{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:1 V
P = 6.27 ft
b) Hydraulic Radius, R = A/P
AX =Channel cross-sectional area, ftz
P =Wetted Perimeter, ft
AX = 2.15 ftz
P = 6.27 ft
R = 0.343 ft
t
d ~1
M
N-- B -~
c) Bypass Channel Velocity, v = (1.49/n)*Ry3*S'~, 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 pereimeter (P), ft
s =Channel slope, ft/ft
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 lining. 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, Ib/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
T = 0.7 Ib/ftz
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 8.05g.
VI. Flow Splatter (Forebay) Specifications
Using the orifice equation, Q = Cd*A*(2*g*h)i'~zi
a) Pipe Cross-sectional Area , Ap1pe = [Td4]dz, ftz
d =Diameter of pipe from forebay to flow splatter, 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 to the 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]
"P;Pe =Pipe cross-sectional area, ft~
g =Gravitational acceleration, ft/s2
h =Height of water above the orifice (head), ft
Q = 1.10 cfs
Cd = 0.6
"P;Pe = 0.0872 ft~
g = 32.2 ft/s2
h= 6.90 ft
VII. Swale Drainage Calculations
The following calculations use Darcy's law to calculate the time (in hours) that it will take for the swa/e
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 of level spreader, ft
L = 71.70 ft
W= 3 ft
A = 215.09 ftZ
b) Groundwater Flow, Q = (K*i"A)/43200, cfs
Dany's Law
K = Average coefficient of permeabiilty, in/hr [4 in/hr based on Pacolet Loam soils from 0 to 8 inches in depth]
based on the Johnston County Soil Survey (NRCS)
i =Hydraulic gradient [assumed to equal 1]
A =Surface area draining to in-situ soil, ft2
K = 4 in/hr
i= 1
A = 215.09 ft2
Q = 0.0199 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 = 215.09 ftz
V = 107.55 ft
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
Td = 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 7

SOIL & ENVIRONMENTAL CONSULTANTS, PA
ATTACHMENT II
NCDENR LEVEL SPREADER, FILTER STRIP, AND RESTORED RIPARIAN BUFFER
SUPPLEMENT WORKSHEETS

V • `H
q-1
~~~ O `t
NCDENR
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER, FILTER STRIP AND RESTORED RIPARIAN BUFFER SUPPLEMENT
This form must be filled out, rinted and submitted.
I. PROJECT INF,ORMdTION
Project name Taft Woods East
Contact name Rebecca Peterson
Phone number [phone]
Date January 22,2006
Drainage area number DA #1
II ~ DESIGN:INFORMATION
For Level Spreaders Receiving Flow From a BMP
Type of BMP
Drawtlown flow from the BMP cfs
For Level Spreaders Receiving Flow from the Drainage Area
Drainage area
Impervious surface area
Percent impervious
Rational C coefficient
Peak flow from the 1 in/hr storm
Time of concentration
Rainfall intensity, l0-yr storm
Peak flow from the 10-yr storm
Where Does the Level Spreader Discharge?
To a bioretention cell?
To a wetland?
To a filter strip or riparian buffer?
Other (specify)
Filter Strip or Riparian Buffer Characterization (if applicable)
Width of grass .
Width of dense ground cover
Width of wooded vegetation
Total width
Slope (from level lip to to top of bank)
Are any draws present?
Level Spreader Design
Forebay surface area
Feet of level lip needed per cfs
Answer "Y" to one of the following:
Length based on the 1 in/hr storm?
Length based on the 10-yr, 24-hr storm?
Length based on the BMP discharge rate?
Design flow
Is a bypass device provided?
218,518 ftz
56,359 ft~
0.26 (ZCu
0.393
1.971477824 cfs
min
7.22 in/hr
14.23406989 cfs
(Y or N)
(Y or N)
(Y or N) Please complete filter strip characterization below.
50 ft
50 ft
4.75
N (Y or N) OK
112.7 sq ft OK
65 ft/cfs
Y (Y or N)
N (Y or N)
N (Y or N)
1.97 cfs
Y (Y or N) OK
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
Are level spreaders in series?
Bypass Channel Design (if applicable)
Does the bypass discharge through a wetland?
Does the channel enter the stream at an angle?
Dimensions of the channel (see diagram below):
M
B
W
Y
Peak velocity in the channel during the 10-yr, 24-hr storm
Channel lining material
128.3 ft Level spreader length OK.
N (Y or N)
N (Y or N)
Y
3 ft
8.89 ft
10.64 ft
0.292 ft
5 cfs
bermudagrass / matting
w
I.
1 i-----------
M
ri
i B i
------i 1
M
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.2 Parts I. and II. Design Summary, page 2 of 2

~:~ ~
- ,.... ,~
fl(.~ REQIIiRED JTEMS CHECKLIST , a .. :, .: ,: _ , . . ~,
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to
indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a
requirement has not been met, attach justification.
Pagel Plan
i1-,is scale. will poi- ~-2c~srnc~4.~1~ c~
Initials Sheet No. /-' j ~-i-'~- ctrl s ' ~'td~~.>c-d
si~2 ~-ov1s-FYUC}-~Crn d~r0.w~n0.s . i~' -~-hiS She1L-E- iS ~'1~
~.S ~ ~l c~ il~ 1. Plans (~-'--3A'-er-lar~e~) of the entire site showing; its i~\e , o~JSu~~e me~ct.\ s4-r~e.~' co.~
-Design at ultimate build-out, b ~. ~~~~d2d
-Off-site drainage (if applicable),
-Delineated drainage basins (iflelude-R~attonal-G-coefficient-peF basinj, ~ni s i S <<'\c1Ud~d i c~ ~-4-~e.
-Forebay (if applicable), U-'kc~Ch~, c~lC~1o.-h~e+ns,
-High flow bypass system,
- Maintenance access,
~'~ ~ drainage easement and public right of way (R01I~, and
~ -Boundaries of drainage easement.
.~- ~ ~ ~~ 2. Plan details (~=~34' e~iar~) for the level spreader showing: T1r-E~S sc.c~.l~ ~~ ~\1 c\Q~ ~-o'~~''~~'~,
- Forebay (if applicable), -~,-} c~ ~ ;-c:,ld~tir~ s~~.e ccrtS~~c~
-High flow bypass system, dra~,vi,no~s . ~~ -Nn~ she~2.} t~ ~~
-One foot topo lines between the level lip and top of stream bank, vtsib\~z. , c~ s,.~p 1~~mzv~t~L1
drainage easement, antl sin~'r ce`'~ b`` ~`-'t~`'~~'
-Design at ultimate build-out.
.S ~ ly o~ ll~ 3. Section view of the level spreader ( " - er) showing: ~~.~,~~ ~ ,n ~~- {..o S~ t,2 ,
- Underdrain system (if applicable),
- Level lip,
- Upslope channel, and
- Downslope filter fabric.
~. ~ 4. Abate-stared photograph of the filter strip that clearly shows the type of vegetation that is present.
~~ A ~1 ~-E-2 S~cavtp is noT o~ ~h2/ap! o-{~' , 1^cwev~~r, ~\ ~ phc~tnS
~Je~~~., T0.~v~ can, ~ci31c~
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. ~
_! Jt _ Y'a r~ 1 6. A construction sequence that shows how the level spreader will be protected from sediment until the entire
drainage area is stabilized.
(-S ~~. ~ 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 i~ clot c.~~-r~-,r\-Hy ~~nd~~ can-l~-c C`c 4v ~~o~m CcTns~vc'c-ic~n s~~v'vt~~Un
~e^r kln~.S~ 1e~2\ S'}~~~'2r.~:~~v-S ~~d 'ne~~ ,,,~~vr+~?.v1c.~,1c.2s.
''~ ~ This ~s -~~r\d~c\~ c~<-ev~l o~ -~h~ S-i-v~~rnwct-~v' p1c`~n.
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.2 Part III, page 1 of 1

Attachment II Site Photos
Photo 1 -Vegetated filter strip downslope of drainage area #1.
Taft Woods East-Level Spreaders Soil & Environmental Consultants, PA
January 2008 S&EC Job # 9197.D1

~ ~. ,yQ~
~~ O
NCDENR
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER, FILTER STRIP AND RESTORED RIPARIAN BUFFER SUPPLEMENT
This form must be filled out, rinted and submitted.
I: PROJECT INFORMATION
Project name Taft Woods East
Contact name Rebecca Peterson
Phone number [phone]
Date January 22, 2008
Drainage area number DA #2
IL: DESIGN INFORMATION
For Level Spreaders Receiving Flow From a BMP
Type of BMP
Drawdown flow from the BMP cfs
For Level Spreaders Receiving Flow from the Drainage Area
Drainage area
Impervious surface area
Percent impervious
Rational C coefficient
Peak flow from the 1 in/hr storm
Time of concentration
Rainfall intensity, l0-yr storm
Peak flow from the 10-yr storm
Where Does the Level Spreader Discharge?
To a bioretention cell?
To a wetland?
To a filter strip or riparian buffer?
Other (specify)
Filter Strip or Riparian Buffer Characterization (if applicable)
Width of grass
Width of dense ground cover
Width of wooded vegetation
Total width
Slope (from level lip to to top of bank)
Are any draws present?
Level Spreader Design
Forebay surface area
Feet of level lip needed per cfs
Answer "Y" to one of the following:
Length based on the 1 in/hr storm?
Length based on the 10-yr, 24-hr storm?
Length based on the BMP discharge rate?
Design flow
Is a bypass device provided?
53,683 ft2
14,314 ftz
0.27 (~;~ ~~
0.4
0.492956841 Cfs
min
7.22 in/hr
3.559148393 cfs
N (Y or N)
N (Y or N)
Y (Y or N) Please complete filter strip characterization below.
0 ft
0 ft
50 ft
50 ft
5.98
N (Y or N) OK
28.6 sq ft OK
65 ft/cfs
Y (Y or N)
N (Y or N)
N (Y or N)
0.49 cfs
Y (Y or N) OK
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
Are level spreaders in series?
Bypass Channel Design (if applicable)
Does the bypass discharge through a wetland?
Does the channel enter the stream at an angle?
Dimensions of the channel (see diagram below):
M
B
W
Y
Peak velocity in the channel during the 10-yr, 24-hr storm
Channel lining material
32.05 ft Level spreader length OK.
N (Y or N)
N (Y or N)
Y
3 ft
2.27 ft
4.21 ft
0.323 ft
4.5 cfs
bermudagrass I matting
• w •
t :-----------
M
i 13 i
t
M
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.2 Parts I. and II. Design Summary, page 2 of 2

~!~ ~ 2..
:.
III: REQUIRED~ITEMS CHECKLIST" , • , ` ' ti'' , n . , ~ • ~ -. '
~.,K..
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to
indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a
requirement has not been met, attach justification.
Pagel Plan
-t"lr,is state will nod c-ec~Scr~C~b1~ ~~ U1 S'~~~~dct`~'c~
Initials Sheet No. ~/ st~2 ~~,~,~~,,~ d~rc~.win~s . i~j ~h;S Shy-} is ~~~
~S ~ ~ o~ 1i~ 1. Plans (" 9'-er-larger) of the entire site showing: v~st~\e , o. su~~eme,n-t-c~.\ s4-t~et- a-~an
- Design at ultimate build-out, b z Prov;d~d
-Off-site drainage (if applicable),
-Delineated drainage basins (ir~eelude-~R~atiepal-G-coefficient-per-basiej, ~ni s i S ; r1c,1ud.2d ~ c~ ~-4~~,
- Forebay (if applicable), a-'kc~Ch~~. c. ~~c~ i o.-E-t' cans ,
-High flow bypass system,
-Maintenance access,
-~ ~~ -•Igeeet`ded drainage easement and public right of way (ROU1r7, and
-Boundaries of drainage easement.
~ ~ 1la 2. Plan details (1" = 30' or larger) for the level spreader showing:
- Forebay (if applicable),
-High flow bypass system,
-One foot topo lines between the level lip and top of stream bank,
~~ - Reee~ed drainage easement, and
-Design at ultimate build-out.
S ~I~' ~ 1(~ 3. Section view of the level spreader (1"-Z6brfarger) showing: tee.-1-c~~1 ~nc~ ~ s ~s'~~e
- Underdrain system (if applicable),
-Level lip,
- Upslope channel, and
(} ~ ~ - Downslope filter fabric.
i J I A'~I: a"C.. 4, A-da#e-s#er~petl photograph of the filter strip that clearly shows the type of vegetation that is present.
A da-F2. S-t-oavt~ .s no=t o~ i-he p4,o~-c, , l~c~.~eV2~r', c.\ t Pi~G~S
r--- wQ~2, -t-c~~v'1 are , to 1?~ 1 d~ ~^' X0/31 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~ IiQ 6. A construction sequence that shows how the level spreader will be protected from sediment until the entire
(~ ~ ~ drainage area is stabilized.
{~J I t`5 -7i~ Z 7. The supporting calculations.
IKJ - ~}~ 8. A copy of the signed and notarized inspection antl maintenance (I&M) agreement.
9. A copy of the deed restriction. ~ ~
~ S ~ ~L is nc+ c~x~re,~~-1~y ~dev' can-l-~aC'c 1v ~ur~o~rrn C~S~c.-1~ c~ s~~~v~~~an
{~e^r -l~~e."~ leJ~2\ S'}~v~'e.c~~-~.vS c~x,d T'ne.~~ ~j~v~--i-e.r~cu1CC'~S.
~ '~ ~~S ~S pe~c\a~c\cs ~: oval a-~ ~h~ S•}-o~~rnwc~-Fetr •Plc~~r, .
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.2 Part III, page 1 of 1

Attachment II Site Photos
Photo 2 -Vegetated filter strip downslope of drainage area #2.
Taft Woods East-Level Spreaders Soil & Environmental Consultants, PA
January 2008 S&EC Job # 9197.D1

~ ~~O

~~~ > a
o <
NCDENR
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER, FILTER STRIP AND RESTORED RIPARIAN BUFFER SUPPLEMENT
This form must be filled out, printed and submitted.

I. PR(}JECTINFORMATION
Project name Taft Woods East
Contact name Rebecca Peterson
Phone number [phone]
Date January 22,2008
Drainage area number DA #3
II:.;DESIGN INiFORMATION
For Level Spreaders Receiving Flow From a BMP
Type of BMP Wet Pond
Drawdown flow from the BMP 2 cfs
For Level Spreaders Receiving Flow from the Drainage Area Do not complete this section of the worksheet.
Drainage area ft~ Do not complete this section of the worksheet.
Impervious surface area ft2 Do not complete this section of the worksheet.
Percent impervious Do not complete this section of the worksheet.
Rational C coefficient Do not complete this section of the worksheet.
Peak flow from the 1 in/hr storm cfs Do not complete this section of the worksheet.
Time of concentration min
Rainfall intensity, l0-yr storm in/hr Do not complete this section of the worksheet.
Peak flow from the 10-yr storm cfs Do not complete this section of the worksheet.
Where Does the Level Spreader Discharge?
To a bioretention cell? N (Y or N)
To a wetland? N (Y or N)
To a filter strip or riparian buffer? Y (Y or N) Please complete filter strip characterization below.
Other (specify)
Filter Strip or Riparian Buffer Characterization (if applicable)
Width of grass 0 ft
Width of dense ground cover 0 ft
Width of wooded vegetation 50 ft
Total width 50 ft
Slope (from level lip to to top of bank) 4.62
Are any draws present? N (Y or N) OK
Level Spreader Design
Forebay surface area s4 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? N (Y or N)
Length based on the 10-yr, 24-hr storm? N (Y or N)
Length based on the BMP discharge rate? Y (Y or N)
Design flow 2 cfs
Is a bypass device provided? Y (Y or N) OK
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 130 ft #VALUE!
Are level spreaders in series? N (Y or N)
Bypass Channel Design (if applicable)
Does the bypass discharge through a wetland?
Does the channel enter the stream at an angle?
Dimensions of the channel (see diagram below):
M
W
Y
Peak velocity in the channel during the 10-yr, 24-hr storm
Channel lining material
(Y or N)
ft
ft
ft
cfs
• w
~I
~ i------------
M
B
1
M
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.2 Parts I. and II. Design Summary, page 2 of 2

1~/~ ~3
~~ ~. ., a~a :~~
III ° REQUIRED; ITEMS CHECKLIST~~ ~`~ ` i
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to
indicate the follov~ing 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
Initi Is Sheet No. This scctite w i 1 l _ n o} r-e~.srn~b\~j ~i~- a~ s-\-~~Y~dct`~ca
3i ~~ c-o~ns-hru c~,cr~ d ~rctw i n cis . ~~ -~\r\~S She.~-F~ iS. rlcrk
'~aF Ib 1. Plans(~A'-er-iar~geF)oftheentiresiteshowing: v~s\~\e- ; c~ sv~\ernev~-~c~\ s\rt~e-~ ~'~
-Design at ultimate build-out, b z. ~~o~ ~c+,~d
-Off-site drainage (if applicable),
-Delineated drainage basins (ir~eiade-f~atieaal-G-coefficient-peg basinj, ~ni s i S ; r\c1Ud~2d i ~ WZe-
~~), c~-~'cc~Ch ~d c r.~.\cv 1 t,~.-~i' e+nS .
~~ f`~tce35a~ ~j ~O'
}v~:s p.P:ti~~t2u-y.e A/, 2;,~ _. S e~ SJfJ~uF'~:n~ ~lcs,
-Maintenance access,
~ ~ -Reseeded drainage easement and public right of way (ROVE, and
-Boundaries of drainage easement.
~-~~ i~ 2. Plan details (" - ger) for the level spreader showing: i"1r+~S s~~\~, a~.i~\\ 'nom
- Forebay (if applicable), ~zc~SC~rtiab\~ ~;t c~c\ a `~~~~~'rd
-High flow bypass system, s(~ ccx,S~ruc-~-icn c3~rr~,w'\R s •~
-One foot topo lines between the level lip and top of stream bank, ~'~ shc.~ is nab vtS~~\~~ ~
-~ ~ --Reseeded drainage easement, and s.:~~~-`~Y`2,n-~".\ sheer cc~~ b~
-Design at ultimate build-out. Prav~~ •
l~l ~ I la 3. Section view of the level spreader (" eF) showing: L7~~c,~..~\ (1Ca'~ '+`fl `~e~-\e
- Underdrain system (if applicable),
-Level lip,
- Upslope channel, and
p - Downslope filter fabric.
,~ S I 1~.Zt. 4. A-date-stamped photograph of the filter strip that clearly shows the type of vegetation that is present.
~~ A ~1 ci~2. s-{-c~v~n~ +S no=r o~!> ~-he, pho-E-a , lr,c~eve~, ~\ + PhG`~S
~-- w~~2, -rc~~v~ can , ~o i31 c~ ~ col a1 ! o'}
`- 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 "~' l in 6. A construction sequence that shows how the level spreader will be protected from sediment until the entire
t_N "DA 3 ,r drainage area is stabilized.
~S ~ i y'+~-~ 7. The supporting calculations.
S ~ Prl~= 3IL 8. A copy of the signed and notarized inspection and maintenance (I&M) agreement.
9. A copy of the deed restriction. ~ ~
~ S £ ~L ~s n c+ c~xre~r\-Ny ~~\de~ cc.~~-r-c.C-~ 1~, ~~~o~~c~n c cAns~v c~ can S~ ~~rV 1~ \~
~^r -Hr,2^s~ lev21 S'}~~'e~~v~s ~..nd +h¢..~c ~j~vr+~hc~lc2s.
~ ~ ~;S ~S '~eKlc~~~\CS ~~o~cz~ a-~ ~e S-~a~~nwa-~v' p\c,~.~n.
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.2 Part III, page 1 of 1

Attachment II Site Photos
Photo 3 Vegetated filter strip downslope of drainage area #3.
Taft Woods East-Level Spreaders Soil & Environmental Consultants, PA
January 2008 S&EC Job # 9197.D1

U• ~H
~~ 0~
e~
NCDENR
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER, FILTER STRIP AND RESTORED RIPARIAN BUFFER SUPPLEMENT
This form must be filled out rinted and submitted.
I. PROJECT~NFORMATION
Project name Taft Woods East
Contact name Rebecca Peterson
Phone number [phone]
Date January 22, 2008
Drainage area number DA #4
II: DESIGN INFORMATION
For Level Spreaders Receiving Flow From a BMP
Type of BMP
Drawdown flow from the BMP cfs
For Level Spreaders Receiving Flow from the Drainage Area
Drainage area
Impervious surface area
Percent impervious
Rational C coefficient
Peak flow from the 1 in/hr storm
Time of concentration
Rainfall intensity, 10-yr storm
Peak flow from the 10-yr storm
Where Does the Level Spreader Discharge?
To a bioretention cell?
To a wetland?
To a filter strip or riparian buffer?
Other (specify)
48,413 ft2
13,140 ft2
0.27 cZ~~~
0.402
0.446786639 cfs
min
7.22 in/hr
3.225799534 cfs
N (Y or N)
N (Y or N)
Y (Y or N) Please complete filter strip characterization below.
Filter Strip or Riparian Buffer Characterization (if applicable)
Width of grass 0 ft
Width of dense ground cover 0 ft
Width of wooded vegetation 50 ft
Total width 50 ft
Slope (from level lip to to top of bank) 2.04
Are any draws present? N (Y or N) OK
Level Spreader Design
Forebay surface area 26.3 sq ft OK
Feet of level lip needed per cfs 65 ft/cfs
Answer "Y" to one of the following:
Length based on the 1 in/flr storm? Y (Y or N)
Length based on the 10-yr, 24-hr storm? N (Y or N)
Length based on the BMP discharge rate? N (Y or N)
Design flow 0.45 cfs
Is a bypass device provided? Y (Y or N) OK
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
Are level spreaders in series?
Bypass Channel Design (if applicable)
Does the bypass discharge through a wetland?
Does the channel enter the stream at an angle?
Dimensions of the channel (see diagram below):
M
B
W
Y
Peak velocity in the channel during the 10-yr, 24-hr storm
Channel lining material
29.1 ft Level spreader length OK.
N (Y or N)
N (Y or N)
Y
3 ft
2.19 ft
4.16 ft
0.329 ft
3.1 cfs
bermudagrass /matting
w
I, ~ l
,
t ~-----------
M
s
1
------------i
M
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.2 Parts I. and II. Design Summary, page 2 of 2

'DID -~ y
Ilf REQUIRE[}{1TE~IS„GFIECj(~IST` : j -
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to
indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a
requirement has not been met, attach justification.
Pagel Plan
T1-,is scale wi11 rlo-F r-e.c.Soneibl~ ~~
Initials Sheet No. ~" ~ ~i'~- ~ s } - v~d~ti~-ci
5~~2. ~-ans-l-~uC~GC1 d~rCiw~fl.S . ~~' -1-hiS S~e1L-~ iS ~1c~}
~' ~ t~ 1. Plans (~-38-ar-aar~e~) ofthe entire site showing: vas ~~,~e . o~~s~~~\er~~,.,+ct\ shQe.-~ c~-~
- Design at ultimate build-out, b e- P~-ov (dE.d
- Off-site drainage (if applicable),
- Delineated drainage basins (inek~e-Ra#feaal-G-eoefficier~~per basirjj, i ~nis i S ~ncl~d.ed ~ c~ fie..
- Forebay (if applicable), ~-~4-c~ch~d. c~lc~loch'c~ns.
-High flow bypass system,
- Maintenance access,
~ - Reee~ed drainage easement and public right of way (ROV11), and
-Boundaries of drainage easement.
8 ~~l 2. Plan details (1" = 30' or larger) for the level spreader showing:
- Forebay (if applicable),
-High flow bypass system,
-One foot topo lines between the level lip and top of stream bank,
~~ -Retarded drainage easement, and
- Design at ultimate build-out.
I_`j r~i l(0 3. Section view of the level spreader (~~z6brfarger) showing: '~~~~\ r~G~- '~-~ scz..0e .
- Underdrain system (if applicable),
- Level lip,
- Upslope channel, and

A+~
~ - Downslope filter fabric.
4
A
d
t
#
d
h
. .
-
a
e-s
~r~pe
p
otograph of the filter strip that clearly shows the type of vegetation that is present.
~~ A ri~-~z s}~rn~ ~s (~oT o~ +h2 pho}z, , l~~ev2r', ~1 t PhG~S
5. An assurance that the Inst Iled system will meet design spec fications u
on initial o
eration once the
p
p
project is complete and the entire drainage area is stabilized. ~
~3 ~ ftes 6. A construction sequence that shows how the level spreader will be protected from sediment until the entire
drainage area is stabilized.
~ ~ (J
'~~? i-S "~'Ay 7. The supporting calculations.
I~1 ~- ~- 8, A copy of the signed and notarized inspection and maintenance (I&M) agreement.
9. A copy of the deed restriction. -~ ~
~ S~t=C- rs n~ c.~e~-Hy ~de~ con~aCT 4v ~-~o~~m Cc~ns~vc,-hcAn sc~~rv~s~~1
~'r '~-h2>~ le~r2.1 ~~~rer.~~v-5 and =~h¢.~f ~~j~vri-er~c~,alcES .
~ ~ This ~s ~~~na~ncS c~-oval ~-~ }he. S~~rnwa-l~v- -P1c~.~n.
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.2 Part III, page 1 of 1

Attachment II
Site Photos
Photo 4 -Vegetated filter strip downslope of drainage area #4.
Taft Woods East-Level Spreaders Soil & Environmental Consultants, PA
January 2008 S&EC Job # 9197.D1

TWA
~~u `~~G
O `~
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER, FILTER STRIP AND RESTORED RIPARIAN BUFFER SUPPLEMENT
This form must be filled out, rinted and submitted.
L< PROJECT INFORMATION
Project name Taft Woods East
Contact name Rebecca Peterson
Phone number (9t9) 846-5900
Date January 22, 2008
Drainage area number DA #5
IL !DESIGN INFORMATION
For Level Spreaders Receiving Flow From a BMP
Type of BMP
Drawdown flow from the BMP cfs
For Level Spreaders Receiving Flow from the Drainage Area
Drainage area
Impervious surface area
Percent impervious
Rational C coefficient
Peak flow from the 1 in/hr storm
Time of concentration
Rainfall intensity, 10-yr storm
Peak flow from the 10-yr storm
Where Does the Level Spreader Discharge?
To a bioretention cell?
To a wetland?
To a filter strip or riparian buffer?
Other (specify)
40,522 ft2
14,334 ft2
0.35 (35 ~~~
0.465
0.432569559 cfs
min
7.22 in/hr
3.123152218 cfs
N (Y or N)
N (Y or N)
Y (Y or N) Please complete filter strip characterization below.
Filter Strip or Riparian Buffer Characterization (if applicable)
Width of grass 0 ft
Width of dense ground cover 0 ft
Width of wooded vegetation 50 ft
Total width 50 ft
Slope (from level lip to to top of bank) 4.3
Are any draws present? N (Y or N) OK
Level Spreader Design
Forebay surface area 28.7 sq ft OK
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 (Y or N)
Length based on the 10-yr, 24-hr storm? N (Y or N)
Length based on the BMP discharge rate? N (Y or N)
Design flow 0.43 cfs
Is a bypass device provided? Y (Y or N) OK
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
Are level spreaders in series?
Bypass Channel Design (if applicable)
Does the bypass discharge through a wetland?
Does the channel enter the stream at an angle?
Dimensions of the channel (see diagram below):
M
B
W
Y
Peak velocity in the channel during the 10-yr, 24-hr storm
Channel lining material
28.13 ft Level spreader length OK.
N (Y or N)
N (Y or N)
Y
3 ft
2.27 ft
3.98 ft
0.286 ft
3.5 cfs
bermudagrass /matting
w
~1
i
i
t ~____-_____-
M
B
______~ t
M
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.2 Parts I. and II. Design Summary, page 2 of 2

~S
Il( REQUIRED;ITEMS:CHECKLI$T}` ` ~`' r x, v ' _` ' ~ '
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to
indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a
requirement has not been met, attach justification.
Page! Plan
itia Sheet No. ~ T~,i s settle wi 1 t ~o~ c-'e..clSc~ncil~l~j ~~ q-~ s-~-~~vrci~t~d
s~~e. c-ans-hruC~-~cx\ c3~rC~w~n0.S . i~' ~-h~S S1'~e.~-E- ~S r1C•>'k
~ G~ ll~ 1. Plans (~=5a'-~r-larger) of the entire site showing: v~s~~~\e. o~Js~~•i~\ecv~e~~\ s4-~~e-t- cow
-Design at ultimate build-out, bz P~o~~d.2d
- Off-site drainage (if applicable),
-Delineated drainage basins (ir~eelude-I~attenal-G~oeffici>Wnt-peg basin, Tani s ~ S ; nclu~.e d ~ c~ k4~2
- Forebay (if applicable), a~c~ch~ calc~\c.-l-~• c%~S .
-High flow bypass system,
-Maintenance access,
~~ - Reserved drainage easement and public right of way (RO11~, and
-Boundaries of drainage easement.
"' ' ~~ 1~ 2. Plan details (1" = 30' or larger) for the level spreader showing:
- Forebay (if applicable),
-High flow bypass system,
-One foot topo lines between the level lip and top of stream bank,
~~ - f~eser~ed-drainage easement, and
-Design at ultimate build-out.
I~ c~ it,~ 3. Section view of the level spreader (~"--~9briarger) showing: -pz~,\ n ~ ~, s~,C,~l~L .
- Underdrain system (if applicable),
-Level lip,
- Upslope channel, and
- Downslope filter fabric.
(~~1: iT 4. A-da#e-sta~tped photograph of the filter strip that clearly shows the type of vegetation that is present.
~~ A d ~~2 S~c~rn~ ~s r~o-~s c*n ~~ ol3p / ~ , lnc~e~l~~, 0.\ ~ Phc~S
v.; ~2, tcxk~vl c^~ , ~ o l:31 c ~
5. An assurance thaf the installed system will meet design specifications upon initial operation once the
,r~ p project is complete and the entire drainage area is stabilized. ~
"SJ i3 ~r ll0 6. A construction sequence that shows how the level spreader will be protected from sediment until the entire
~~ CC drainage area is stabilized.
(W~ I-S -~1~5 7. The supporting calculations.
[2 S~ Aft. lam- 8. A copy of the signed and notarized inspection and maintenance (I&M) agreement.
___.. .___ 9. A copy of the deed restriction. ~ ~
-~ S~~c. is net e~x~x~-~-1y t/~r\dev' ecJ,~e~c~ 1-a ~~-~o•rm cc~~s-~e,-~c~n s~~~rv~~~Gn
-C~ -1-4,.~5~ l~.r2\ s~,r2adev-S ~z.~~d ~e.~c ~~vr-i-~~nc~,~c2s.
~ ~ ~;~~ ~S ~e~a~nc~ ~.--oval ~-~ 'rhe. S-t-o~~nwc~~v' ~P1c~~n.
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.2 Part III, page 1 of 1

Attachment II Site Photos
Photo 5 -Vegetated filter strip downslope of drainage area #5.
Taft Woods East-Level Spreaders Soil & Environmental Consultants, PA
January 2008 S&EC Job # 9197.D1

U' ~~!'
~G
~~~ o ~
NCDENR
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER, FILTER STRIP AND RESTORED RIPARIAN BUFFER SUPPLEMENT
This form must be filled out, printed and submitted.
t< PROJECT INFORMATION
Project name Taft Woods East
Contact name Rebecca Peterson
Phone number [phone]
Date January 22,2007
Drainage area number DA #6
Ilc.,pES1GN~INFORMATION
For Level Spreaders Receiving Flow From a BMP
Type of BMP
Drawdown flow from the BMP cfs
For Level Spreaders Receiving Flow from the Drainage Area
Drainage area
Impervious surface area
Percent impervious
Rational C coefficient
Peak flow from the 1 in/hr storm
Time of concentration
Rainfall intensity, 10-yr storm
Peak flow from the 10-yr storm
Where Does the Level Spreader Discharge?
To a bioretention cell?
To a wetland?
To a filter strip or riparian buffer?
Other (specify)
Filter Strip or Riparian Buffer Characterization (if applicable)
Width of grass
Width of dense ground cover
Width of wooded vegetation
Total width
Slope (from level lip to to top of bank)
Are any draws present?
Level Spreader Design
Forebay surface area
Feet of level lip needed per cfs
Answer "Y" to one of the following:
Length based on the 1 in/hr storm?
Length based on the 10-yr, 24-hr storm?
Length based on the BMP discharge rate?
Design flow
Is a bypass device provided?
70,658 ft
26,463 ft2
0.37 C~~' ~°>
0.481
0.780222635 cfs
min
7.22 in/hr
5.633207428 cfs
N (Y or N)
N (Y or N)
Y (Y or N) Please complete filter strip characterization below.
0 ft
0 ft
50 ft
50 ft
5.89
N (Y or N) OK
52.9 sq ft OK
65 ft/cfs
Y (Y or N)
N (Y or N)
N (Y or N)
0.78 cfs
Y (Y or N) OK
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
Are level spreaders in series?
Bypass Channel Design (if applicable)
Does the bypass discharge through a wetland?
Does the channel enter the stream at an angle?
Dimensions of the channel (see diagram below):
M
W
Y
Peak velocity in the channel during the 10-yr, 24-hr storm
Channel lining material
50.72 ft Level spreader length OK.
N (Y or N)
N (Y or N)
Y
2.56 ft
4.54 ft
0.331 ft
4.8 cfs
bermudagrass /matting
~ w •
~ ~l
t i------------
M
B ~
' t
M
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.2 Parts I. and II. Design Summary, page 2 of 2

~~ -~ l~
~, : E . ~.. ~ :, ~- . „ .,
_. ,_ _ :, ,
Ilf REQUIREf3;_jTEMSCHECKLlST
1.; a.,. ! ,ss 4
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to
indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a
requirement has not been met, attach justification.
Pagel Plan
T1~,is scnle wi11 ~1a~ ~~c'~sc'f1C~,1~1~ ~`
Initials Sheet No. ti/-' j ~i} ~~ s } - v~d~ti~c~l
s~~2 ins-1-~vC~,c~n draw+n~s . ~~ ~-h~S S~e.~-~ ~'s nca-4
12 S P ~ 1 t~ 1. Plans (4=5A'-er-lar~e~) of the entire site showing: ~ ~ s <<~,~e , ~ s u~1 e m ~~c~.\ s~n~e.-F- cl-~
- Design at ultimate build-out, b ~ Prov ~c4.~d
- Off-site drainage (if applicable),
- Delineated drainage basins (i+~e+ade-R-a#fewal-C-~coe~cierkt-peFbasiej, `~ni s i S ~ncl~~d ~ n ~~.
-Forebay (if applicable), a-~4-c~~h~ c ~lc~ 1 a.-h~ e+r1S .
-High flow bypass system,
-Maintenance access,
~~- Reeerded drainage easement and public right of way (ROIL, and
-Boundaries of drainage easement.
~SC IQ G~ Ilo 2. Plan details ~) for the level spreader showing: i his scc~.~e ~'~\\ 'nom
-Forebay (if applicable), rec~.~~can ably ~i-4 ~'n ~` ``n~`r~
-High flow bypass system, s~ ~ cc,ns-'~rvch~an dre~wt n S _ ~
-One foot topo lines between the level lip and top of stream bank, ms`s shit ~s ;~ ~;~~b~e, q
~ - Reearded-drainage easement, and s~~ p 1~.rn2,~~-~~.\ s~~.,~ c~lt1
- Design at ultimate build-out. ~~- tn~"a~ ~-d
~~ Iy ~ l l0 3. Section view of the level spreader (r~er) showing: ~~.\~~\ ~ ok .}t, ~ crti\ ~, ,
- Underdrain system (if applicable),
- Level lip,
- Upslope channel, and
~~ ~ p - Downslope filter fabric.
f `~f Ask. Tr 4. Abate-stareped photograph of the filter strip that clearly shows the type of vegetation that is present.
~~ A ri c`-~z S~~^nP ;s r1o~ o~c1 ~h olaTi / oo-~~' , 1'`cwev~e~, c 1 t phc~oS
`- 5. An assurance t at the installed system will me t design specifications upon initial operation once the
project is complete and the entire drainage area is stabilized. ~
~~ i3 ~ ttrs 6. A construction sequence that shows how the level spreader will be protected from sediment until the entire
drainage area is stabilized.
_ 1-5~ to 7. The supporting calculations.
__~__ Ac1~.~ 8. A copy of the signed and notarized inspection and maintenance (I&M) agreement.
9. A copy of the deed restriction. ~ ~
~ S £ r/L is nct c~x-r'e.~\-~\y ~~\de~ con-~C~ 4v -~,r-~o~~m cc~~s~~-1-; c~ s~~~rv~~~~n
~'r '~.~,^~ (~.r2\ 5~~~2c~~-~S czx,d Th2.~~ ~j~~r-1-e.~nc~,1cC's.
'~ '~ This ~s pe~na~nc~ cam:--ovQl c~ ~h~ S~-o~~nnwc~-1-~~ p1c`~n.
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.2 Part III, page 1 of 1

Attachment II
Site Photos
"AMa :.~,
Photo 6 -Vegetated filter strip downslope of drainage area #6.
Taft Woods East-Level Spreaders Soil & Environmental Consultants, PA
January 2008 S&EC Job # 9197.D1

~~ ~y0
©~~ o
NCDENR
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER, FILTER STRIP AND RESTORED RIPARIAN BUFFER SUPPLEMENT
This form must be filled out, rioted and submitted.
L~ PROJECT;;INFORMATION
Project name Taft Woods East
Contact name Rebecca Peterson
Phone number [phone]
Date January 22,2008
Drainage area number DA #7
II;- DESIGN INFO~tMATION
For Level Spreaders Receiving Flow From a BMP
Type of BMP
Drawdown flow from the BMP cfs
For Level Spreaders Receiving Flow from the Drainage Area
Drainage area
Impervious surface area
Percent impervious
Rational C coefficient
Peak flow from the 1 in/hr storm
Time of concentration
Rainfall intensity, l0-yr storm
Peak flow from the 10-yr storm
Where Does the Level Spreader Discharge?
To a bioretention cell?
To a wetland?
To a filter strip or riparian buffer?
Other (specify)
Filter Strip or Riparian Buffer Characterization (if applicable)
Width of grass
Width of dense ground cover
Width of wooded vegetation
Total width
Slope (from level lip to to top of bank)
Are any draws present?
Level Spreader Design
Forebay surface area
Feet of level lip needed per cfs
Answer "Y" to one of the following:
Length based on the 1 in/ttr storm?
Length based on the 10-yr, 24-hr storm?
Length based on the BMP discharge rate?
Design flow
Is a bypass device provided?
121,895 ftz
31,645 ftz
0.26 (7.S.c l
0.394
1.102539715 cfs
min
7.22 in/hr
7.960336745 cfs
N (Y or N)
N (Y or N)
Y (Y or N) Please complete filter strip characterization below.
0 ft
0 ft
50 ft
50 ft
2.02
N (Y or N) OK
63.3 sq ft OK
65 ft/cfs
Y (Y or N)
N (Y or N)
N (Y or N)
1.1 cfs
Y (Y or N) OK
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
Are level spreaders in series?
Bypass Channel Design (if applicable)
Does the bypass discharge through a wetland?
Does the channel enter the stream at an angle?
Dimensions of the channel (see diagram below):
M
B
W
Y
Peak velocity in the channel during the 10-yr, 24-hr storm
Channel lining material
71.7 ft Level spreader length OK.
N (Y or N)
N (Y or N)
Y
3 ft
3.41 ft
6.12 ft
0.452 ft
3.7 cfs
bermudagrass /matting
~ w •
~1
,
,
t ~_________---
M
i 13 i
____--~ t
M
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.2 Parts I. and II. Design Summary, page 2 of 2

~(~ ~
(I(~.REQUIRED:,~lTEMS CHECKLIST" -
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to
indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a
requirement has not been met, attach justification.
Pagel Plan
Initials Sheet No. ~- phis scc~te will X10} ~-~c~sc*nc~b1~~ ~~- c~t-~ S~~`~d~ti.~c-cl
~ C p s~ ~2 c~ar~ s-1YU C{~ cn\ d ~rCt w ~ n ~S . ~~ ~_\,~~5 S~e.~~- ~S r1c~k
~ S P ~~ 1. Plans (~3A-er-Iar~eF) ofthe entire site showing: ~~s~~v,\e. ; o~ su~leMev~-Fct,\ s4~~e~- c~~
-Design at ultimate build-out, b ~ p~v id~d
-Off-site drainage (if applicable),
- Delineated drainage basins (inek~ele-f~atienal-6-cc~etfcierat-per-basinj, finis i S ;r\c:lvd.e.d i n ~~.
- Forebay (if applicable), ~.-~-c~~hed, c.~lc~1o.-h r.~S.
-High flow bypass system,
-Maintenance access,
~~ - k~eserded drainage easement and public right of way (ROIN), and
t~ -Boundaries of drainage easement.
!L ~P it ~ 1h 2. Plan details (" - r-Farms) for the level spreader showing: This sc-c~.\2 w'~\~ n~r~"
- Forebay (if applicable), tir~cxlab\~~ -~';~ c.~r1 s'ra~nc~c~-d
-High flow bypass system, si.~~ ec~n9'rruL}~ c,.~ ~a rc~,uJ~r~e~s .~''
-One foot topo lines between the level lip and top of stream bank, ~'~~' ~~~-~ \''} ~~ v ts.~,\e , o.
s~ izm~-k~.\ she.a_-\- cwn b~.
,tt ~ - F~ieser~ed drainage easement, and ~~ ided
- Design at ultimate build-out.
2~~ t'k ~ 1l0 3. Section view of the level spreader ( "1--~9'~r-larger) showing: ~kc~.~\ ~na~ ~-o s c.r~~,\~ .
- Underdrain system (if applicable),
- Level lip,
- Upslope channel, and
- Downslope filter fabric.
~2-~ - ~' 4. A-date-s#arnped photograph of the filter strip that clearly shows the type of vegetation that is present.
ti~ A d~~2 s-4-a~t~n~ ~s no-~ ~n mho/ap%~ , 1~c~ever, r~\t phc~S
.~ 5. An assurance t at the installed system will meet design speafications upon initial operation once the
project is complete and the entire drainage area is stabilized. ~
13 ~-F 1l~ 6, A construction sequence that shows how the level spreader will be protected from sediment until the entire
drainage area is stabilized.
t ~~ I-5 t'7A~ 7. The supporting calculations.
J'-~ ~• ~ 8. A copy of the signed and notarized inspection and maintenance (I&M) agreement.
.,-.- 9. A copy of the deed restriction. ~ ~
:~ S ~ i/rr i s n c+ c~x~~1y Un d ev' ccn-1~r~C~ t-~ -~~-Fo~,rc~n C ~~ S~-~v c,-~-~ cord s ~ p~~rv ~~ ~ ~n
~ -1'v,~.S~ lerr21 s'~~~e,~~-ev-s ~d +~e~ ~ ~~~~~-+e,~ca~cc~s .
~ '~ This ~S ~e.~na~ncS cam.--oval o~ ~h2 S~-o~rnwc~~~ p1c~>n .
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.2 Part III, page 1 of 1

Attachment II Site Photos
Photo 7 -Vegetated filter strip downslope of drainage area #7.
Taft Woods East-Level Spreaders Soil & Environmental Consultants, PA
January 2008 S&EC Job # 9197.D1

off- It~sB
SOIL & ENVIRONMENTAL CONSULTANTS, PA
ATTACHMENT III
FILTER STRIP, RESTORED BUFFER, AND LEVEL SPREADER INSPECTION &
MAINTAINANCE AGREEMENTS

Permit Number:
(to be provided by DWQ)
Drainage Area Number: DA # 1
Filter Strip, Restored Riparian Suffer and Level Spreader
Inspection and Maintenance Agreement
I will keep a maintenance record on this BMP. This maintenance record will be kept in a
log in a known set location. Any deficient BMP elements noted in the inspection will be
corrected, repaired or replaced immediately. These deficiencies can affect the integrity
of structures, safety of the public, and the removal efficiency of the BMP.
Important 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 pollutant
removal efficiency. Turf grass should not be cut shorter than 3 to 5 inches and
may be allowed to grow as tall as 12 inches depending on aesthetic requirements
(NIPC,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 will be added if necessary.
After the filter strip is established, it will be inspected quarterly and within 24 hours
after every storm event greater than 1.0 inch (or 1.5 inches if in a Coastal County).
Records of inspection and maintenance will be kept in a known set location and will be
available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element: Potential roblem: How I will remediate the roblem:
The entire filter strip Trash/debris is present. Remove the trash/debris.
s stem
The flow splitter device The flow sputter device is Unclog the conveyance and dispose
(if applicable) 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 SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer I&M-Rev.2 Page 1 of 3

BMP element: Potential roblem: How I will remediate the roblem:
The Swale and the level 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 dams ed.
There is erosion around the 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 or shrubs have begun Remove them.
to grow on the Swale 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 strip Grass is too short or too long Maintain 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. 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 a one-
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 water Erosion or other signs of Contact 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 SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer I&M-Rev.2 Page 2 of 3

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 Woods East, Level Spreader Design
BMP drainage area number: DA #1
Print name: Lauraleen, LLC c/o George Schlecht
Title: Manager
Address: 3515 Queen Anne Court, Clayton, NC 25727
Phone: [phone]
Signature:
Date: i ~/~ ~~ 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.
1, ~ ~ 7"0.. ~ . ~~~t » d~ ri , a Notary Public for the State of
~01~`I~Yt I:QX~DC~ I"n, h~ ,County of ~ph~ n , do hereby certify that
~LOR')- °V ~~ L' L~'1'~" personally appeared before me this
day of `1~prp p~j~f- , _~ 7 ,and acknowledge the due execution of the
forgoing filter strip, riparian buffer, and/or level spreader maintenance requirements.
Witness my hand and official seal,
\\~~~~~ ~ E L L. ~' . ///~i
N~'T~%
~ y.
~-
= i~l07ARY -_
PUBLIC -
~ v =
:°ti a, .~
~ \.
i~~~~~~~~~ C4 ~~~~
~.
~S. ifl'~
SEAL
My commission expires r~r o~0
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer I&M-Rev.2 Page 3 Of 3

Permit Number:
(to be provided by DWQ~
Drainage Area Number: DA #2
Filter Strip, Restored Riparian Buffer and Level Spreader
Inspection and Maintenance Agreement
I will keep a maintenance record on this BMP. This maintenance record will be kept in a
log in a known set location. Any deficient BMP elements noted in the inspection will be
corrected, repaired or replaced immediately. These deficiencies can affect the integrity
of structures, safety of the public, and the removal efficiency of the BMP.
Important 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 pollutant
removal efficiency. Turf grass should 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 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 quarterly and within 24 hours
after every storm event greater than 1.0 inch (or 1.5 inches if in a Coastal County).
Records of inspection and maintenance will be kept in a known set location and will be
available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element: Potential roblem: How I will remediate the roblem:
The entire filter strip Trash/debris is present. Remove the trash/debris.
s stem
The flow sputter device The flow sputter device is Unclog the conveyance and dispose
(if applicable) 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 SWU401-Level Spreader, Filter Strip, Restored Ripazian Buffer I&M-Rev.2 Page 1 of 3

BMP element: Potential roblem: How I will remediate the roblem:
The Swale and the level 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 dama ed.
There is erosion around the 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 or shrubs have begun Remove them.
to grow on the swale 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 strip Grass is too short or too long Maintain 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. 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 a one-
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 water Erosion or other signs of Contact 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 SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer I&M-Rev.2 Page 2 of 3

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 Woods East, Level Spreader Design
BMP drainage area number: DA #2
Print name: Lauraleen, LLC c/o George Schlecht
Title: Manager
Address: 3515 Queen Anne Court, Clayton, NC 25727
Phone: [phone]b
Signature: ~~
Date: i ~-/ ~'~ ~
Note: The legally responsible party should not be a homeowners association unless more than 50% of
the lots have been sold and a resident of the subdivision has been named the president.
I, ~ ~ `~a_ S . ~1 ji ~~ , a Notary Public for the State of
/~~~ ,,~~p~ I hd,, ,County of ~Ohn ~ , do hereby certify that
VP17tYlPi Seh lec!,h~ personally appeared before me this ~~?
day of~pyyl~Y , ~, and acknowledge the due execution of the
forgoing filter strip, riparian buffer, and/or level spreader maintenance requirements.
Witness my hand and official seal,
\\~~~~ ~~LLII~cT~~i--
~~' o~~~
_~
~ ~®`SARG
pu~~~ U=
2~
v ~~ \~~
//~~o~~~TON C~~~~~\\
SEAL
My commission expires_~u A,C~ "~'~ a ~~
J
Form SWU401-Level Spreader, Filter Strip, Restored Ripazian Buffer I&M-Rev.2 Page 3 of 3

Permit Number:
(to be provided by DWQ~
Drainage Area Number: DA #3
Filter Strip, Restored Riparian Buffer and Level Spreader
Inspection and Maintenance Agreement
I will keep a maintenance record on this BMP. This maintenance record will be kept in a
log in a known set location. Any deficient BMP elements noted in the inspection will be
corrected, repaired or replaced immediately. These deficiencies can affect the integrity
of structures, safety of the public, and the removal efficiency of the BMP.
Important 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 pollutant
removal efficiency. Turf grass should not be cut shorter than 3 to 5 inches and
may be allowed to grow as tall as 12 inches depending on aesthetic requirements
(l~tII'C,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 will be added i£ necessary.
After the filter strip is established, it will be inspected quarterly and within 24 hours
after every storm event greater than 1.0 inch (or 1.5 inches if in a Coastal County).
Records of inspection and maintenance will be kept in a known set location and will be
available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element: Potential roblem: How I will remediate the roblem:
The entire filter strip Trash/debris is present. Remove the trash/debris.
s stem
The flow sputter device The flow sputter device is Unclog the conveyance and dispose
(if applicable) 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 SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer I&M-Rev.2 Page 1 of 3

BMP element: Potential roblem: How I will remediate the roblem:
T'he Swale and the level 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 dams ed.
There is erosion around the 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 cone-time fertilizer
a lication.
Trees or shrubs have begun Remove them.
to grow on the swale 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 strip Grass is too short or too long Maintain 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. 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 a one-
time fertilizer a licadon.
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 water Erosion or other signs of Contact 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 SWCJ401-Level Spreader, Filter Strip, Restored Riparian Buffer I&M-Rev.2 Page 2 of 3

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 Woods East, Level Spreader Design
BMP drainage area number: DA #3
Print name: Lauraleen, LLC c/o George Schlecht
Title: Manager
Address: 3515 Queen Anne Court, Cla on, NC 25727
Phone: [phone] _
Signature: /s~--~
Date: i 2~i ~~ ~
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~//1~~. ~I//rl A`f~Yl , a Notary Public for the State of
~DY'~1 (,dX"D~ln li, ,County of ~Dbl n~s7 , do hereby certify that
~' P~rae Seh I eehf personally appeared before me this ~ g~
day of~P~P~~Q,Y , o~, and acknowledge the due execution of the
forgoing filter strip, riparian buffer, and/or level spreader maintenance requirements.
Witness my hand and official seal,
~~ y~
~~
_ iyu iARY
= F~ 4J ~ L C v
~~~ .y \~
~~ ~(!! I I lad
SEAL
My commission expires r 70/
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer I&M-Rev.2 Page 3 of 3

Permit Number:
(to be provided by DWQ)
Drainage Area Number: DA #3
Wet Detention Basin Inspection and Maintenance Agreement
I will keep a maintenance record on this BMP. This maintenance record will be kept in a
log in a known set location. Any deficient BMP elements noted in the inspection will be
corrected, repaired or replaced immediately. These deficiencies can affect the integrity
of structures, safety of the public, and the removal efficiency of the BMP.
The wet detention basin system is defined as the wet detention basin,
pretreatment including forebays and the vegetated filter if one is provided.
This system (check one):
^ does ®does not
This system (check one):
^ does ®does not
incorporate a vegetated filter at the outlet.
incorporate pretreatment other than a forebay.
Important maintenance procedures:
- Immediately after the wet detention basin is established, Iandscapulg plants the
nl~n+.. ,.,, +1,,, „+ +.,,a 1, lE ,a + G +L. 7-.
r- ......~. ~.... cg~ cccr~rccxrixrccrF%-rxxncccxvr~a~rc 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 the landscaping plants ^^ t''^ ~~^b^fi^'_-^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 24 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 roblem: How I will remediate the roblem:
The entire BMP Trash/debris is resent. 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.
Fonn SW401-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 roximatel six inches.
BMP element: Potential roblem: How I will remediate 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 dama ed.
Erosion is occurring in the Regrade the swale 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.
The 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 for possible. Remove the sediment and
sediment storage. 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 if needed to
revent future erosion roblems.
Weeds are present. Remove the weeds, preferably by
hand. If pesticide is used, wipe it on
the lants rather than s ra in .
The : cgc=..~a«lf Best professional practices Prune according to best professional
landscaped. vegetation show that pruning is needed practices
to maintain optimal plant
health.
Plants are dead, diseased or Determine the source of the
dying. problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants. Provide aone-time
fertilizer 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 Sediment 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 a professional to remove
50% of the area. and control the al al rowth.
Cattails, phragmites or other Remove the plants by wiping them
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
BMP element: Potential roblem: How I will remediate the roblem:
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 the outlet device. Dispose
of the sediment off-site.
The outlet 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 401 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.
BASIN DIAGRAM
ill in the blanks)
0 Permanent Pool Elevation 189.0
Sediment R moval El. 189.0 ennan t Pool
- - - - - - - - - - - - - - - - - Volume Sediment Removal Elevation 181.0 Volume
Bottom levation 187.0 1-ft Min. ---------------------------
Sediment Bottom Elevation 180.0 1-ft n
Storage Sedime
Storage
FOREBAY MAIN POND
Form SW401-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 Woods East, Level Spreader Design
BMP drainage area number: DA #3
Print name: Lauraleen, LLC c/o George Schlecht
Title: Manager
Address:_3515 Queen Anne Court, Clayton NC 25727
Phone
Signat
Date: ~ ~ - ~ ~ O$
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.
1, ~t d.. ~ • ~ 11!•1 7~'v" a Notary Public for the State of
O r~'~n ~ ~b ~ !~ County of TOH h S~"t~h , do hereby certify that
G ~eorq~ C • SC~ { r? Ch`i' personally appeared before me this ~ ~7
r
day of J ay,u,or p 1~ ,and acknowledge the due execution of the
forgoing wet detention basin maintenance requirements. Witness my hand and official
seal, ~~~ ~/
,;!;~Ir<<;,; U
~~~' ~ ~- ~
~~ ~ ~
- <~: o% ,
~:- ' _' ~ _
~~ ~~~
irk/%~.a~ ~ `~`~`, \\\
''!111111!!~~
SEAL
My commission expires Ooh ~ ~ ~' aC~l~
Form SW401-Wet Detention Basin I&M-Rev.2

Permit Number:
(to be provided by DWQ~
Drainage Area Number: DA #4
Filter Strip, Restored Riparian Buffer and Level Spreader
Inspection and Maintenance Agreement
I will keep a maintenance record on this BMP. This maintenance record will be kept in a
log in a known set location. Any deficient BMP elements noted in the inspection will be
corrected, repaired or replaced immediately. These deficiencies can affect the integrity
of structures, safety of the public, and the removal efficiency of the BMP.
Important 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 pollutant
removal efficiency. Turf grass should 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 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 quarterly and within 24 hours
after every storm event greater than 1.0 inch (or 1.5 inches if in a Coastal County).
Records of inspection and maintenance will be kept in a known set location and will be
available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element: Potential roblem: How I will remediate the roblem:
The entire filter strip Trash/debris is present. Remove the trash/debris.
s stem
The flow sputter device The flow sputter device is Unclog the conveyance and dispose
(if applicable) 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 SWL1401-Level Spreader, Filter Strip, Restored Riparian Buffer I&M-Rev.2 Page 1 of 3

BMP element: Potential roblem: How I will remediate the roblem:
The Swale and the level 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.
setkled, undercut, eroded or
otherwise dams ed.
There is erosion around the 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 or shrubs have begun Remove them.
to grow on the Swale or just
downslo 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 r erosion control.
Turfreulforcement 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 Maintain 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. 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 a one-
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 water Erosion or other signs of Contact 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 SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer 1&M-Rev.2 Page 2 of 3

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 Woods East, Level Spreader Design
BMP drainage area number: DA #4
Print name: Lauraleen, LLC c/o George Schlecht
Title: Manager
Address: 3515 Queen Anne Court, Clayton, NC 25727
Phone: [phone] _
Signature:
Date:__ / ~~ ~~~
Note: The legally responsible party should not be a homeowners association unless more than 50% of
the lots have been sold and a resident of the subdivision has been named the president.
I, ~t / at, ~. ~~~t ~~ Y1 , a Notary Public for the State of
~DY~ h rp jl n ,County of JohrZ~~ y~ , do hereby certify that
~Anrae ~~P~'1~ personally appeared before me this ~w'?
day of ~ p~~~~,y , ~' ~'~, and acknowledge the due execution of the
forgoing filter strip, riparian buffer, and/or level spreader maintenance requirements.
Witness my hand and official seal,
\`\\~P S ELL /~c~~i//.
~~ O
~ y .-
NOTARY
PUBLIC =
' v V~
%oy =
//~~!`s~ON CO~~~~~\`
~>/AL
My commission expires r~pr~-~ 7', ap//
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer I&M-Rev.2 Page 3 of 3

Permit Number:
(to be provided by DWQ~
Drainage Area Number: DA #5
Filter Strip, Restored Riparian Buffer and Level Spreader
Inspection and Maintenance Agreement
I will keep a maintenance record on this BMP. This maintenance record will be kept in a
log in a known set location. Any deficient BMP elements noted in the inspection will be
corrected, repaired or replaced immediately. These deficiencies can affect the integrity
of structures, safety of the public, and the removal efficiency of the BMP.
Important 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 pollutant
removal efficiency. Turf grass should 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 maintenance.
- Once a year, the soil will be aerated if necessary.
- Once a year, sail pH will be tested and lime will be added if necessary.
After the filter strip is established, it will be inspected quarterly and within 24 hours
after every storm event greater than 1.0 inch (or 1.5 inches if in a Coastal County).
Records of inspection and maintenance will be kept in a known set location and will be
available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element: Potential roblem: How I will remediate the roblem:
The entire filter strip Trash/debris is present. Remove the trash/debris.
s stem
The flow sputter device The flow sputter device is Unclog the conveyance and dispose
(if applicable) 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 SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer I&M-Rev.2 Page 1 of 3

BMP element: Potential roblem: How I will remediate the roblem:
The Swale and the level 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 dama ed.
There is erosion around the 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 cone-time fertilizer
a lication.
Trees or shrubs have begun Remove them.
to grow on the swale or just
downslo 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 strip Grass is too short or too long Maintain 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. 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 a one-
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 water Erosion or other signs of Contact 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 SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer I&M-Rev.2 Page 2 of 3

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 Woods East, Level Spreader Design
BMP drainage area number: DA
Print name: Lauraleen, LLC c/o George Schlecht
Title: Manager
Address: 3515 Queen Anne Court, Clayton, NC 25727
Phone; [phone]
Signature:
Date: ~ ~~~ ~~ 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, ~ ~~'~ S ~ X11 i nn~on , a Notary Public for the State of
O r~h~n 1rD~t~~, County of `10 ~~gy) , do hereby certify that
c~P(~~~~'lIP_P_~l~ personally appeared before me this ~~
day of ~,b~ , and acknowledge the due execution of the
forgoing filter strip, riparian buffer, and/or level spreader maintenance requirements.
Witness my hand and official seal,
`\\~~PS ELl/HcT~~~i
~~ ~ ~i
~~
iJ®T~RY -
= RJFLlC -
o ~~~
ti
//~'''~sr®N co~~'~` `;
SEAL
My commission expires~~Dl"U1.~, 0~0/
Form SWLT401-Level Spreader, Filter Strip, Restored Riparian Buffer I&M-Rev.2 Page 3 of 3

Permit Number:
(to be provided by DWQ)
Drainage Area Number: DA #6
Filter Strip, Restored Riparian Buffer and Level Spreader
Inspection and Maintenance Agreement
I will keep a maintenance record on this BMP. This maintenance record will be kept in a
log in a known set location. Any deficient BMP elements noted in the inspection will be
corrected, repaired or replaced immediately. These deficiencies can affect the integrity
of structures, safety of the public, and the removal efficiency of the BMP.
Important 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 pollutant
removal efficiency. Turf grass should not be cut shorter than 3 to 5 inches and
may be allowed to grow as tall as 12 inches depending on aesthetic requirements
(NIPC,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 will be added if necessary.
After the filter strip is established, it will be inspected quarterly and within 24 hours
after every storm event greater than 1.0 inch (or 1.5 inches if in a Coastal County).
Records of inspection and maintenance will be kept in a known set location and will be
available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element: Potential roblem: How I will remediate the roblem:
The entire filter strip Trash/debris is present. Remove the trash/debris.
s stem
The flow sputter device The flow sputter device is Unclog the conveyance and dispose
(if applicable) 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 SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer I&M-Rev.2 Page 1 Of 3

BMP element: Potential roblem: How I will remediate the roblem:
The swale and the level 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 dama ed.
There is erosion around the 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 or shrubs have begun Remove them.
to grow on the Swale 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 strip Grass is too short or too long Maintain 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. Provide lime and a
one-time fertilizer a lication.
Sediment is building upon Remove the sediment and
the filter strip. restabilize the soil with vegetation if
necessary. Provide lime and a one-
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 water Erosion or other signs of Contact 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 SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer I&M-Rev.2 Page 2 of 3

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 Woods East, Level Spreader Design
BMP drainage area number: DA #6
Print name: Lauraleen, LLC c/o George Schlecht
Title: Manager
Address: 3515 Queen Anne Court, Clanton, NC 25727
Phone: [phone]
Signature: _ ~- ~-
Date: i ~~ ~ ,~ 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, ~ ~ ~o~.. ~. ~/l~ n a5~o r- , a Notary Public for the State of
N erg ~ARvlt~lg ,County of ~ohy~~_ , do hereby certify that
17P1~r' P_ S 'C~ ~ eC~'1 ~ personally appeared before me this ~~
day of~e.Cem~X ~Op'/ ,and acknowledge the due execution of the
forgoing filter strip, riparian buffer, and/or level spreader maintenance requirements.
Witness my hand and official seal,
\\\\~S~j~LL~/~yG;~~`
~~
~ 2~
:iZ+f~RY '
~~ v-
o ~
///~ry~sT~N C 0~~~~ ~\~
n'y~~ iir I ~1
SEAL
My commission expires ~P~r~b,,rc~ ~ . ~ /~
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer I&M-Rev.2 Page 3 of 3

Permit Number:
(to be provided by DWQf
Drainage Area Number: DA #7
Filter Strip, Restored Riparian Buffer and Level Spreader
Inspection and Maintenance Agreement
I will keep a maintenance record on this BMI'. This maintenance record will be kept in a
log in a known set location. Any deficient BNIl' 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 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 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 pollutant
removal efficiency. Turf grass should 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 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 quarterly and within 24 hours
after every storm event greater than 1.0 inch (or 1.5 inches if in a Coastal County).
Records of inspection and maintenance will be kept in a known set location and will be
available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element: Potential roblem: How I will remediate the roblem:
The entire filter strip Trash/debris is present. Remove the trash/debris.
s stem
The flow sputter device The flow sputter device is Unclog the conveyance and dispose
(if applicable) 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 SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer I&M-Rev.2 Page 1 of 3

BMP element: Potential roblem: How I will remediate the roblem:
The swale and the level 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 dama ed.
There is erosion around the 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 or shrubs have begun Remove them.
to grow on the swale 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 strip Grass is too short or too long Maintain 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. 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 a one-
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 water Erosion or other signs of Contact 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 SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer I&M-Rev.2 Page 2 Of 3

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 Woods East, Level Spreader Design
BMP drainage area number: DA #7
Print name: Lauraleen, LLC c/o George Schlecht
Title: Manager
Address: 3515 Oueen Anne Court, Clayton, NC 25727
Phone: [phone] ~
Signature:
Date: i ~~i ~~ 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, ~t 7E2L 5 . ~/1 r n~ , a Notary Public for the State of
~Jf~ ~I h ~ ,County of _~h n ~, h , do hereby certify that
___('7Pv~n~ .hlech~' personally appeared before me this
day of~p.CP~b~ , ~~, and acknowledge the due execution of the
forgoing filter strip, riparian buffer, and/or level spreader maintenance requirements.
Witness my hand and official seal,
~Y.
~~
~~
~J€.1~lelC v,
2~
i~o'S' ,`-~ ~~~
/~~i~sT~N CO~a\\~~
~~HL
My commission expires ~Y,1D1'c1(~.rtn '~ 0~0//
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer I&M-Rev.2 Page 3 of 3

SOIL & ENVIRONMENTAL CONSULTANTS, PA
ATTACHMENT IV
RIPARIAN BUFFER AUTHORIZATION PRE-CONSTRUCTION NOTICE

Office Use Only: Form Version March OS
USACE Action ID No. DWQ No.
(tt any particular item is not applicable to this project, please enter "Not Applicable" or "N/A".)
I. Processing
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 Number(s) Requested: N/A
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: ~~~~
7)~j~y
'.,." * g S
D ~~ ~ ~ 66tt
II. Applicant Information
~E~ 4 2~Q8
1. Owner/Applicant Information
DEN~.~NN`tER~pUN.ll r'
Name: Lauraleen, LLC (Attn: George Schlecht_~~s$~,~57n~~wA~~sR~'``c~
Mailing Address: 3515 Oueen 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 the Agent Authorization letter
must be attached if the Agent has signatory authority for the owner/applicant.)
Name: Rebecca Peterson PE
Company Affiliation: Soil & Environmental Consultants, PA
Mailing Address: 11010 Raven Ridge Road
Raleigh NC 27614
Telephone Number:~919)846-5900 Fax Number: [phone]
E-mail Address: RPeterson(a,SandEC.com
Page 1 of 9

III. Project Information
Attach a vicinity map clearly showing the location of the property with respect to local
landmarks such as towns, rivers, and roads. Also provide a detailed site plan 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 the property
boundaries outlined. Plan drawings, or other maps may be included at the applicant's discretion,
so long as the property is clearly defined. For administrative and distribution purposes, the
USACE requires information to be submitted on sheets no larger than 11 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
the project has been placed on hold until decipherable maps are provided.
1. Name of project: Taftwoods East-Section 2
2. T.I.P. 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 Hi hway 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 f 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 http://h2o.enr.state.nc.us/admin/maps/.)
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

10. Describe the overall project in detail, including the type of equipment to be used: The
pro op sed project is a residential development. Riparian buffer impacts will be the result of 6
bypass channels associated with level spreaders.
11. Explain the purpose of the proposed work: The purpose of the residential subdivision is to
provide needed housing to meet the orgwi_n~ demands for this area. The purpose of the level
spreaders is to provide diffuse flow for stormwater that has been concentrated as a result of
the development. Riparian buffer authorizations will be necessar. fy or bypass channels on 5
of the 7 proposed level spreaders.
IV. Prior Project History
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 for prior segments of the same T.I.P. project, along with
construction schedules. A 401 Water Quality Certification was issued by DWQ on October 15
2007 permitting 258 linear feet of perennial stream impacts 11 686 square feet of Zone 2 Neuse
buffer impacts, and 7,374 square feet of Zone 1 Neuse buffer impacts NCEEP issued an
acceptance__l_etter to receive payment for compensatory mitigation for the 258 linear feet of
perennial stream impacts. On October 1 2007 S&EC requested authorization from the US
Arm~rps 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.
V. Future Project Plans
Are any future permit requests anticipated for this project? If so, describe the anticipated work,
and provide justification for the exclusion of this work from the current application.
There are not future permits known to be required at this time
VI. Proposed Impacts to Waters of the United States/Waters of the State
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 the 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 may be 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 VIII below. If additional
space is needed for listing or description, please attach a separate sheet.
Provide a written description of the proposed impacts: There are no proposed impacts to
jurisdictional waters within this application request.
2. Individually list wetland impacts. Types of impacts include, but are not limited to
mechanized clearing, grading, fill, excavation, flooding, ditching/drainage, etc. For dams,
separately 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 Nearest Impact

(indicate on map) ,
herbaceous, bog, etc.) Floodplain Stream (acres)
(yes/no) (linear feet)
N/A N/A N/A N/A 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 all 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, ditching/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 N/A N/A N/A N/A N/A N/A
Total Stream Impact (by length and acreage) N/A
5. Individually list all open 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 Waterbody 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 impactsproposed 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.
Pond to be created in (check all that apply): ^ uplands ^ stream ^ wetlands
Describe the method of construction (e.g., dam/embankment, excavation, installation of
draw-down 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 land use in the vicinity of the pond: N/A
Size of watershed draining to pond: N/A Expected pond surface area: N/A
VII. Impact Justification (Avoidance and Minimization)
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
site layouts, and explain why these design options were not feasible. Also discuss how impacts
were minimized once the desired site plan was developed. If applicable, discuss construction
techniques to be followed during construction to reduce impacts.
Six (6) of the seven (7) proposed level spreaders were desi n~provide diffuse flow for
storm events up to and including the 1 in/hr intensity. The current BMP manual requires a
buss channel to convey flow resulting from intensities greater than 1 in/hr up to 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 desi n~ ed to provide diffuse flow for events up to and includin thg e 10_yr
event, however, none of the level spreaders could be designed for this flow without exceeding-
the maximum lengths as defined in the BMP Manual. One (1 level spreader could not be
designed to provide diffuse flow for the 1 in/hr intensity without exceeding the maximum len tgth
so a wet detention pond has been designed to capture and release stormwater to this level
spreader at the rate associated with the maximum length. This pond has enough storage to store
and release the 10-yr event to the level spreader at this rate so no bypass channel is needed for
this draina e area (#3). The level spreader located in Drainage Area #2 is located 50' upslope of
a natural swale that is not a buffered stream, therefore the bypass channel will not have and
buffer impacts associated with it.
VIII. Mitigation
DWQ - In accordance with 15A NCAC 2H .0500, mitigation may be required by the NC
Division of Water Quality for projects involving greater than or equal to one acre of impacts to
Page 5 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 the aquatic environment are minimal. Factors
including size 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 may be appropriate and practicable include,
but are not limited to: reducing 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 project, 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 for Stream Work in North Carolina, available at
http://h2o.enr.state.nc.us/ncwetlands/strmgide.html.
Provide a brief description of the proposed mitigation plan. The description should provide
as much information as possible, including, but not limited 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 the 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 miti atig on 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. Mitigation 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 the NCEEP
website at http://h2o.enr.state.nc.us/wrp/index.htm. If use of the NCEEP is proposed, please
check the appropriate box on page five and provide the following information:
Amount of stream mitigation requested (linear feet): n/a
Amount of buffer 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

IX.
X.
Environmental Documentation (required by DWQ)
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 yes, 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 [phone] to review current thresholds for environmental documentation.
Yes ^ No ^
3. If yes, has the document review been finalized by the State Clearinghouse? If so, please
attach a copy of the NEPA or SEPA final approval letter. Yes ^ No ^
Proposed Impacts on Riparian and Watershed Buffers (required by DWQ)
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 the 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 ® 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**)
square feet Multiplier Required
Miti ation
1 389 N/A N/A
2 227 (30) N/A N/A
Total 616 (30) N/A
Drainage Area #4
Zone* Impact (Temporary**)
square feet Multiplier Required
Mitigation
1 387 N/A N/A
2 83 (165) N/A N/A
Total 470 (1651 N/A
Page 7 of 9

Drainage Area #5
XI.
Zone* Impact (Temporary**)
square feet Multiplier Required
Mitigation
1 647 N/A N/A
2 112 (213) N/A N/A
Total 759 (213) N/A
Drainage Area #6
Zone* Impact (Temporary**)
s uare feet Multiplier Required
Mitigation
1 851 N/A N/A
2 101 (167) N/A N/A
Total 952 (167) N/A
Drainage Area #7
Zone* Impact (Temporary**)
square feet Multiplier Required
Mitigation
1 782 N/A N/A
2 188 (308) N/A N/A
Total 970 (308) N/A
Total
Zone* Impact (Temporary**)
square feet Multiplier Required
Mitigation
1 3056 N/A N/A
2 711 (883) N/A N/A
Total 3767 (883) N/A
* Zone 1 extends out 30 feet perpendicular from the top of the near bank of channel; Zone 2 extends an
additional 20 feet from the edge of Zone 1.
** Temporary impacts will occur during construction of the bypass channels. All areas
impacted during construction will be stabilized and revegetated.
3. If buffer mitigation is required, please discuss what type 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 bypass channels required for level spreaders per the BMP Manual and should be
considered "allowable" therefore mitigation is not proposed
Stormwater (required by DWQ)
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%, specifically 14.6%. The project is located in
Johnston County and will have to adhere to the Johnston County Stormwater ordinances.
Additionallyproject is located with Watershed, Water Supply IV, NSW waters and subject
to Phase II Post-Construction requirements, all DWQ dele a~ ted programs to Johnston Count~_
XII. Sewage Disposal (required by DWQ)
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.
XIII. Violations (required by DWQ)
Is this site in violation of DWQ Wetland Rules (15A NCAC 2H .0500) or any Buffer Rules?
Yes ^ No
Is this an after-the-fact permit application? Yes ^ No
XIV. Cumulative Impacts (required by DWQ)
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.us/ncwetlands. 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 Policy a qualitative or quantitative impact
analysis should not be required.
XV. Other Circumstances (Optional):
It is the applicant's responsibility to submit the application sufficiently in advance of desired
construction dates to allow processing time for these 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 the applicant's control).
F j_ ~ tf ~~ q _.
Applicant/Agent's Signature Date
(Agent's signature is valid only if an authorization letter from the applicant is provided.)
Page 9 of 9

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Michael F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Coleen H. Sullins, Director
Division of Water Quality
October 1 S, 2007
Mr. George Schlecht
Lauraleen, LLC
3 51 S Queen Ann Drive
Clayton, NC 27527
Subject Property:
rr ~y ,~
°`~ ~~ I~ ~ ~~ N~_ 1t DWQ Project # 07-1658
:~~ {
Johnston County
~~: ~.
Y
{
~,,. ~,,.i Q, [p'r(tu!!1'i"r; LO?Sil~28~5, F ~~
Taftwoods East -Section 2
Ut to Mill Creek [030402, 27-39, WSTV, NSW]
Approval of 401 Water Quality Certification and Authorization Certificate per the Neuse River
Buffer Protection Rules (15A NCAC 2B .0233) with Additional Conditions
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 feet of Zone 2 Neuse River basin protected
riparian buffer, as described in your application dated October 1, 2007, and received by the Division of
Water Quality (DWQ) 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 Permit(s) NW29 when
issued by the US Army Corps of Engineers (iJSACE). In addition, you should obtain or otherwise
comply with any other required federal, state or local permits before you go ahead with.your project
including (but not limited to) Erosion and Sediment Control, and Non-discharge regulations. Also, this
approval to proceed with your proposed impacts onto conduct impacts to waters as depicted in
your application shall. expire upon expiration of the 404 or CAMA Permit.
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 to 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 (now or in the future) exceed one acre of
wetland or 1 SO linear feet of stream, compensatory mitigation may be required as described in 15A
NCAC 2H .0506 (h). This approval requires you to follow the conditions listed in the attached
certification and any additional conditions listed below.
The Additional Conditions of the Certification are:
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:
No,~thCarolina
401 Oversight/Express Review Permitting Unit ' Qtllrll!!t~
1650 Mail Service Center, Raleigh, North Carolina 27699-1650
2321 Crabtree Boulevard, Suite 250, Raleigh, North Carolina 27604
Phone: [phone] /FAX [phone] / Internet: http://h2o.enr.state.nc.us/ncwetlands

Lauraleen, LLC
Page 2 of 5
October 15, 2007
T e of Im act Amount A iaaved Units Plan Location or Reference
Stream - erennial 258 linear feet PCN a e 4 of 10
Buffers Zone 1 11,686 s uare ft. PCN a e 7 of 10
Buffers Zone 2 7,374 (s uare ft. PCN a e 7 of 10
2. No Waste, Spoil, Solids, or Fill 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 and 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 Erosion Control Planning and Design Manual.
b. The design, installation, operation, and maintenance of the sediment and erosion control
measures must be such that they equal, or exceed, the requirements specified in the most
recent version of the North Carolina Sediment and Erosion Control Manual. The devices
shall be maintained on all construction sites, borrow sites, and waste pile (spoil) projects,
including contractor-owned or leased borrow pits associated with the project.
c. .Sufficient materials required for stabilization and/or repair of erosion control measures and
stormwater routing and treatment shall be on site at all times.
4. Sediment and Erosion Control Measures
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
the Division of Land Resources has released 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.ore/doh/operationsBMP manual/download/BMP Manual ndf)
such as sandbags, rock berms, cofferdams and other diversion 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 to prevent 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 5
October 15, 2007
Culvert(s) shall not be installed iri such ~ 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
stream 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 shall not be conducted in a manner that may result in dis-
equilibrium of wetlands or streambeds or banks, adjacent to or upstream and down stream of the
above structures. The applicant is required to provide 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. If rip-rap is
necessary, it shall not be placed in the 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" form to notify NCDWQ when all.,w;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 downstream of each culvert site to document correct installation along with the
Certificate of Completion form.
6. Protective Fencing
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 visibility material) for the areas that have been approved- to infringe within the
buffer, wetland or water prior to any land disturbing activities;
7. Compensatory Mitigation Using the Ecosystem Enhancement Program (EEP)
Mitigation must be provided for the proposed impacts as specified in the table below. We
understand that you wish to make a payment to the Wetlands Restoration Fund administered by
the NC Ecosystem Enhancement Program (BEP) to meet this mitigation requirement. This has
been determined by the 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 Office), no impacts specified in this Authorization Certificate shall occur. The EEP
should be contacted at [phone] if you have any questions concerning payment into a
restoration fund. You have 60 calendar days from the date of this approval to make this
payment. For accounting purposes, this Authorization Certificate authorizes payment into
the Wetlands Restoration Fund to meet the following compensatory mitigation
requirement:

Lauraleen, LLC
Page 4 of 5
October 15, 2007
_T~~e of Impact CompensaEory Mitigation Required River and Sub-basin Number
Stream -perennial 258 (feet) ~ Neuse/03020201
8. Protective Fencing
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 visibility material) for the areas that have been approved to infringe within the
buffer, wetland or water prior to any land disturbing activities;
9. Certificate of Completion
Upon completion of all work approved within the 401 Water Quality Certification or applicable
Buffer R41es, and any subsequent modifications, the applicant is required to return the attached
certificate of completion to the 401 OversightlExpress Review Permitting Unit, North Carolina
Division of Water Quality, 1650 Mail Service Center, Raleigh, NC, 27699-1650.
Violations of any condition herein set forth may result in revocation of this Certification and may result in
criminal and/or 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 CAMA Permit.
If you do not accept any of the conditions of this Certification (associated 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 receive this 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 Mail 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 provided in Articles 3 and 4 of G.S. 150B.
This letter 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 McMillan at 919-733-1786.
Sincer ,
Coleen H. Sullins, Director
Division of Water Quality
CHS/ijm
Enclosures: GC 3631
Certificate of Completion
NCDWQ 401 WQC Summary of Permanent Impacts and Mitigation Requirements
cc: USACE Raleigh Regulatory Field Office
Laureri Witherspoon, DWQ Raleigh Regional Office

Lauraleen, LLC
Page 5 of 5
October 15, 2007
DLR Raleigh Regional Office
File Copy ~.
Central Files ~.
Debbie Edwards, S&EC, P.A., 11010 Raven Ridge Road, Raleigh, NC 27614
Filename: 071658TattwoodsEastSection2(Johnston~141 NBR

O~O~ ~ AT ~9pG
~ r
O 'C
Michael F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Coleen H. Sullins, Director
Division of Water Quality
North Carolina Division of Water Quality
401 Water Quality Certification
Summary of Permitted Impacts and Mitigation Requirements
In accordance with 15A NCAC 2H.0500, Mr. George Schlecht and Lauraleen, LLC, have permission to fill 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 feet of Zone 2 Neuse River basin protected riparian buffer, to construct the
proposed residential development at the site, which is located near Flowers, Johnston County, North Carolina. All
activities associated with these authorized impacts must be conducted with the conditions listed in the attached
Permit transmittal letter. THIS CERTIFICATION IS NOT VALID WITHOUT THE ATTACHMENTS.
COMPENSATORY MITIGATION REQUIREMENTS, ECOSYSTEM ENHANCEMENT PROGRAM
DWQ PROJECT #: 20071658
LOCATION: Flowers
COUNTY Johnston
BASIN/ SUB BASIN Neuse/03020201
As required by 15A NCAC 2H.0500, and the conditions of this Certification, you are required to compensate for
the above mitigable 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 be
rounded to one-quarter acre increments and linear foot requirements must be rounded up to the nearest
foot according to 15 2R.4503(b).
Im acts Miti ation
258 Linear Feet of Perennial Stream 258 Linear Feet of Perennial Stream
One of the 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 amount of payment will be sent to you upon receipt
of this form. PLEASE NOTE, THE ABOVE IMPACTS ARE NOT AUTHORIZED UNTIL YOU RECENE
NOTIFICATION THAT YOUR PAYMENT HAS BEEN PROCESSED BY THE ECOSYTEM ENHANCMENT
PROGRAM.
Signature
Date
ECOSYSTEM ENHANCEMENT PROGRAM
1652 Mail Service Center
RALEIGH, N.C. 27699-1652
[phone]
Filename: 071658TaftwoodsEastSection2(Johnston~}Ol_NBR_EEP
No~r`thCarolina
401 Oversight/Express Review Permitting Unit ~lltllCll~~l~
1650 Mail Service Center, Raleigh, North Carolina 27699-1650
2321 Crabtree Boulevard, Suite 250, Raleigh, North Carolina 27604
Phone [phone] / Fax [phone]
Internet: http://www.ncwaterquality.org '

Environmental Consultants, PA
;Road Raleigh, North Carolina 27614 Phone: [phone] Fax: [phone]
November 20, 2007
S&EC Project # 9197.W4
US Army Corps of Engineers
Attn: Mr. Thomas Brown
6508 Falls of the Neuse Rd., Ste. 120
Raleigh, NC 27615
RE: Notification of Statutory Status of Request for NWP #29
Taftwoods East=Section 2
Clayton, Johnston County, North Carolina
Dear Mr. Brown:
On October 1, 2007, S&EC requested authorization from the US Army Corps of
Engineers (USAGE) to utilize Nationwide Permit (NWP) 29 to provide needed housing
to meet the growing demands for this area. The purpose of the road crossings is to
provide access to otherwise inaccessible portions. of the property. Proposed impacts total
2581inear feet of perennial stream and no wetland impacts. At this time, 50 days have
lapsed since the US Army Corps of Engineer's receipt of the complete preconstruction
notification. To paraphrase the Federal Register (Vol. 67, No. 10, section 13.a.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 complete permit application
therefore, according to the aforementioned regulation the client may proceed with the
proposed activity as depicted in the submitted permit application and in compliance with
the NC-Division of Water Quality's 401.-Approval.
Sincerelfy~
Debbie Edwards.
Environmental Specialist
cc: Mr. George Schlecht (Lauraleen, LLC)
Attachments
1. Copy of NWP General Conditions, Section 13
2. Copy of USAGE signed receipt of the completed PCN application
Charlotte Office: Greensboro Office:
236 LePhillip Court, Suite C 3817-E Lawndale Drive
Concord, NC 28025 Greensboro, NC 27455
Phone: [phone] Phone: [phone]
Fav• r~ne~ ~~n_odn~ F~v• rzu~ adn_Q~zs

2090 Federal Register/ Vol. 67, No. 10 /Tuesday, January 15, 20021 Notices
ma
nagement requirements). Another
important component of water quality
management is the establishment and
maintenance of vegetated buffers next to
open waters, including streams (re[er to
General Condition 19 for vegetated
buffet requirements for the NWPs).
This condition is only applicable to
projects that have the potential to affect
water quality. While appropriate
measures must be taken, inmost cases
it is not necessary to conduct detailed
studies to identify such measures or to
require monitoring.
10. Coastal Zone ltfanagemertt. In
certain states, an individual state coastal
zone management consistency
concurrence must be obtained or waived
(see Section 330.4(d)).
11. Endangered Species. (a) No
activity Is authorized under any NWP
which is likely to jeopardize the
continued existence of a threatened or
endangered species or a species
proposed for such designation, as
identified under the Federal Endangered
Species Act (ESA), or which will
destroy or adversely modify the critical
habitat of such species. Non-federal
permittees shall notify the District
Engineer if any listed species or
designated critical habitat might be
affected or is in the vicinity of the
project, or is located in the designated
critical habitat and shall not begin work
on the activity until notified by the
District Engineer that the requirements
of the ESA have been satisfied and that
the activity is authorized. For activities
that may affect Federally-listed
endangered or threatened species or
designated critical habitat, the
notification must include the name(s) of
the endangered or threatened species
that may be affected by the proposed
work or that utilize the designated
critic al habf tat that maybe affected by
the proposed work. As a result of formal
or informal consultation with the FWS
or NMFS the District Engineer may add
species-specific regional endangered
species conditions to the NWPs.
(b) Authorization of an activity by a
NWP does not authorize the "take" of a
threatened or endangered species as
defined under the ESA. In the absence
of separate authorization (e.g., an ESA
Section 10 Permit, a Biological Opinion
with "incidental take" provisions, etc.)
from the USFWS of the NMFS, both
lethal and non-lethal "takes" of
protected species are in violation of the
ESA. Information on the location of
threatened and endangered species and
their critical habitat can be obtained
directly from the offices of the USFWS
and NMFS or their world wide web
pages at http://www.jws.gov/r9endspp/
endspp.html and http://wwtiv,njms.gov/
prot_nes/esahome.html resppectively.
12. Historic Properties. No activity
which may affect historic properties
listed, or eligible for listing, in the
National Register of Historic Places is
authorized, until the District Engineer
has complied with the provisions of 33
CFR part 325, Appendix C. The
prospective permitter must notify the
District Engineer if the authorized
activity may affect any historic
properties listed, determined to be
eligible, or which the prospective
permitter has reason to believe maybe
eligible for listing on the National
Register of Historic Places, and shall not
begin the~activity until notified by the
District Engineer that the requirements
of the National Historic Preservation Act
have been satisfied and that the activity
is authorized. Information on the
location and existence of historic
resources can be obtained from the State
Historic Preservation Office and the
National Register of Historic Places (see
33 CFR 330.4(8)). For activities that may
affect historic properties listed in, or
eligible for listing in, the National
Register of Historic Places, the
notification must state which historic
property may be affected by the
proposed work or include a vicinity
map indicating the location of the
historic property.
13. Notification.
(a) Timing; where required by the
terms of the NWP, the prospective
permittee must notify the District
Engineer with a preconstruction
notification (PCN) as early as possible.
The District Engineer must determine it
the notification is complete within 30
days of the date of receipt and can
request additional information
necessary to make the PCN complete
only once. However, if the prospective
permitter does not provide all of the
requested information, then the District
Engineer will notify the prospective
permitter that the notification is still
incomplete and the PQl review process
will not commence until all of the
requested information has been received
by the District l;ngineer,jTho
prospective~ermittee sliaTl not bezin
ine acTivrt . .
1 nh notified in writing by the
District Engineer that the aMivity may
proceed under the NWP with any
special. conditions imposed by the
District or Division Engineer; or
(2) If notified in writing by the District
of Division Engineer that an Individual
Permit is required; or
~~ (3) Unless 45 da shave passed from
the District ngineer's receipt of the
complete notification and the
prospective permitter has not received
written notice from the District or
Division Engineer. Subsequently, the
permittee's right to proceed under the
NWP may be modified, suspended, or
revoked only in accordance with the
procedure set forth in 33 (:FR
330.5{d)(2).
(b) Contents ojNotification:The
notification must be in writing and
include the following infomtation:
(1) Name, address and telephone
numbers of the prospective permitter;
(2) Location of the proposed project;
(3) Brief description of the proposed
project; the project's purpose; direct and
indirect adverse environmental effects
the project would cause; any other
NWP(s), Regional General Permit(s), or
Individual Permit(s) used or intended to
be used to authorize any part of the
proposed project or any related activity.
Sketches should be provided when
necessary to show that the activity
complies with the terms of the NWP
(Sketches usually clarify the project and
when provided result in a quicker
decision.);
(4) For NWPs 7,12, 14,16, 21, 34, 38,
39, 41, 42, and 43, the Pt~I must also
include a delineation of affected special
aquatic sites, including wetlands,
vegetated shallows (e.g., submerged
aquatic vegetation, seagrass beds), and
riffle and pool complexes (see pazagraph
13(f));
(5) For NWP 7 (Outfall Structures and
Maintenance), the PCN must include
inforration regarding the original
design capacities and configurations of
those areas of the facility where
maintenance dredging or excavation is
proposed;
(6) For NWP 14 (Lineaz
'hansportation G~ossings), the PCN
must include a compensatory mitigation
proposal to offset permanent losses of
waters of the US and a statement
describing how temporary losses of
waters of the US will be minimized to
the maximum extent practicable;
(7) For NWP 21(Surface Coal Mining
Activities), the PCN must include an
Office of Surface Mining (OStvi) or state-
approved mitigation plan, if applicable.
To be authorized by this NVYP, the
District Engineer must determine that
the activity complies with the terms and
conditions of the NWP and that the
adverse environmental effects are
minimal both individually and
cumulatively and must notify the
project sponsor of this determination in
writing;
(t3) For NWP 27 (Stream and Wetland
Restoration), the PCN must include
documentation of the prior condition of
the site that will be reveled by the
permitter;
~~

Y
o~stem .
PROGRAM
September 26, 2007
George Schlecht
Lauraleen, LLC
3515 Queen Anne Drive
Clayton, NC 27527
Project: Taftwoods East County: JOHNSTON
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 that
the payment will be approved by the permit issuing agencies as mitigation for project impacts. It is the responsibility of the
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. If we have not received a copy of
the issued 404 Permit/401 Certi6cation/CAMA permit within this time frame, this acceptance will expire. It is the
applicant's responsibility to send copies of the permits to NCEEP. 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
work. 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 suppiied by you the impacts that may require compensatory mitigation aze summarized in the
following table.
NEUSE
03020201 Stream (feet) Wetlands (acres) Buffer I

(Sq. Ft.) Buffer II

(Sq. Ft.)
Cold Cooi Wazm Ri azian Non-Ri arian Coastal Mazsh
Impacts 0 0 258 0 0 0 0 0
Credits 0 0 1,456 0 0 0 0 0
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 be responsible for the additional
mitigation, the anplicant will need to submit a mitigation request to NCEEP for approval prior to permit issuance. The
mitigation will be performed in accordance with the Memorandum of Understanding between the N. C. Depaztment of
Environment and Natural Resources and the U. S. Army Corps of Engineers dated November 4, 1998.
If you have any questions or need additional information, please contact Kelly Williams at [phone].
Sincerely,
r
Wi m D. Gilmore,
irector
cc: Cyndi Karoly, NCDWQ Wetlands/401 Unit
Thomas Brown, USACE-Raleigh
Lauren Witherspoon, NCDWQ-Raleigh
Debbie Edwazds, agent
File
R.P.StDYl.GL~f ... ~ ... PYD~Gl2~ OGtf'' .jtR.t"Pi
VrC~DE~lR
North Carolina Ecosystem Enhancement Program, i 652 Mail Service Center, Raleigh, NC 27699-1 652 / 91 9-71 5-0476 / www.nceep.net

SOIL & ENVIRONMENTAL CONSULTANTS, PA
FIGURES

El
I
Project Number:
9197.D1
Project Manager:
RSP
Scale:
I = 1 '000,
Date:
1/22/08
r
,Q—
1 'Y�
Map Title:
Figure I - USGS Map ,
•
Taft Woods East
Johnston County, NC
Source:
Flowers Quadrangle
1t..
P
Project Site
0►� a- ■
Soil & Environmental Consultants, PA
11010 Raven Ridge Rd.- Raleigh, NC 27614
[phone] - [phone]
Web Page: www SandIEC.com

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Project Number:
9197.D1
Project Manager:
RSP
Scale:
I"=500'
Date:
I /22/08
k ,~ •, ~ ~~ ~. • ~- ~, ~ ~ ~~~~ legend
x ~.~-:
1 ~ ~
.; `-~ ~ ". ,. ~ ' ~ ~'~ ~~=`M~°~ ~ ~` ''~' ~ y.' Property Boundary
:
~~: ~ ~ ~ ~':. °~~*~~ ` ~ Level Spreader Drainage Areas
~~
~.p ~.~ ~ '~ d~ ~ Sons
~,,~,: ~ ~ Stream
Map Title:
Figure 2 - Aerlal Photo
Taft WOOdS East ~ Soil & Environmental Consultants, PA
11010 Raven Ridge Rd.• Raleigh, NC 27614
Johnston County, NC [phone] • ~s1s~ a4s-s467
Web Page: www.SandEC.can
Source:
NCDOT GIS