SW4200601_12052-Southwick Solar LLC-NCDEQ SW Revisions-Calcs-2020-09-11_20200911

SOUTHWICK SOLAR, LLC
EROSION CONTROL CALCULATIONS
JUNE 11 th, 2020
REVISION 1: JULY 23rd, 2020
REVISION 2: AUGUST 6th, 2020
PREPARED FOR:
PINE GATE RENEWABLES, LLC
130 ROBERTS STREET
ASHEVILLE, NC 28801
JEFF HUNTLEY
[phone]
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Design
Concepts, PA
NCBELS LICENSE M C-2184-civildesignconcepts.com
JOB N0. 12052
168 PATTON AVENUE
ASHEVILLE, NC 28801
PHONE [phone]
FAX [phone]
52 WALNUT STREET - SUITE 9
WAYNESVILLE, NC 28766
PHONE [phone]
FAX [phone]

SOUTHWICK SOLAR, LLC
CDC Project No.: 12052
D Civil
Design
Concepts, PA
TABLE OF CONTENTS
1. Erosion Control and Stormwater Narrative
2. Impervious Calculations
3. Drainage Area Maps
• EC Drainage
4. Erosion Control Calculations
• Sediment Basin
• Temporary Ditch
5. Culvert Calculations
• Driveway Culvert
6. Rip -Rap Apron Calculations
7. NRCS Soil Report
8. Figures
• USGS Topo Map
• FEMA FIRMette Map
• NOAA Precipitation Tables
Mailing Address: P.O. Box 5432, Asheville, NC 28813
168 Patton Avenue Asheville, NC 28801 52 Walnut Street — Suite 9, Waynesville, NC 28786
Phone [phone] Fax [phone] Phone: [phone] Fax: [phone]

Civil
Design
Concepts, PA
EROSION CONTROL AND STORMWATER NARRATIVE
General
The property located at 3058 Boy Wood Rd in Alamance County, NC is comprised of two (2)
adjacent parcels (8892-12-0463 & 8892-12-1987) which combined have an area of 42.5 acres.
The property is situated between the Haw River (East) and Boy Wood Rd (West). A portion of
the property on which the project will take place lies in the FEMA 100-yr floodplain, however,
none of the project area will lie in the floodplain. Existing features on the property consist
primarily of agricultural fields and wooded areas. Other features include fences, overhead utility
lines, and a natural draw in the topography which develops into a small stream as it goes east
where it flows into the Haw River. The predevelopment impervious area total is 0%.
The proposed solar farm, Southwick Solar, LLC, will consist of solar arrays, inverter pads, utility
line, a 30' landscape buffer, and a new gravel access road with driveway culvert, connecting to
Boy Wood Rd. Ground cover conditions after construction will consist of grassy fields, some
wooded areas and landscaped buffer areas. The post -development impervious area total is
approximately 2.9%
Erosion Control
The proposed erosion control devices consist of a construction entrance, silt fences, temporary
ditches with check dams, rip -rap aprons, and four skimmer basins. Ground stabilization
consisting of seed, straw and mulch will also be applied as needed throughout construction. The
project area will cover approximately 38.16 acres (see plans for more details on erosion control
measures for this project).
Stormwater Control
Post -construction runoff will be treated in accordance with state stormwater recommendations for
solar farms. All slopes under solar arrays will have slopes of 8% or less to avoid concentration of
stormwater runoff. Arrays will be constructed with a maximum loft vertical clearance. During
construction, compaction of soil shall be minimized. A mix of cool and warm season grass seed
will be planted under all solar arrays. Minimal required amounts of fertilizers and herbicides for
vegetation maintenance and weed control will be used during construction as well as after
construction. See plans for more details on stormwater control measures for this project).
Mailing Address: P.O. Box 5432, Asheville, NC 28813
168 Patton Avenue, Asheville, NC 28801 52 Walnut Street — Suite 9, Waynesville, NC 28786
Phone [phone] Fax [phone] Phone: [phone] Fax: [phone]

Impervious Calculations:

--mm'
CDCc.up.m
IMPERVIOUS CALCULATIONS
ONSITE PROPERTY
SOUTHWICK SOLAR, LLC
CDC Proj ect No.: 12052
Area Type
Pre -Development
(SF)
Post Development
(SF)
Grass, Woods
1,823,379
1,775,353
Total Pervious:
1,823,379
1,775,353
Gravel
Pavement
Concrete (Inverter Pads)
0
4,511
0
45,098
7,212
203
Solar Array Piles *
0
24
Buildings
8,164
8,164
Total Impervious:
% Impervious:
12,675
0.7%
60,701
3.3%
Total Area:
1,836,054
1,836,054
*Solar array piles consist of sizes W8x10 and W8xl8. For the purposes of
these calculations, the larger of the two (W8x18) was used to estimate the total
surface area of the piles. The W8xl8 pile has a footprint of 0.037sf. 633 piles
are estimated for this project. The total footprints of the solar array piles is
estimated to be approximately 24sf.

Drainage Area Maps:

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Erosion Control Calculations:

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DC__C'C,5Vpt.,PA
Southwick Solar, LLC
CDC Project No.: 12052
TEMPORARY SEDIMENT BASIN SCHEDULE
BASIN INFORMATION
Trap/Basin ID
A
B
C
Units
Basin Type
Skimmer
Skimmer
Skimmer
Maximum Drainage Area
10
10
10
acre
Drainage Area (DA)
2.34
2.61
4.57
acre
Disturbed Area
2.34
2.61
4.57
acre
Runoff Coefficient (C)
0.6
0.6
0.6
Rainfall Intensity (h0)
7.13
7.13
7.13
in/hr
Top of Water Length
120
150
160
feet
Top of Water Width
30
40
80
feet
L/W Ratio
4.0:1
3.8:1
2.0:1
feet
Water Depth
2.00
2.00
2.00
feet
Side Slope Ratio
2.00
2.00
2.00
X:1
Bottom of Basin Length
112
142
152
feet
Bottom of Basin Width
22
32
72
feet
SURFACE AREA & VOLUME
Runoff (10 Year Event)
10.01
11.17
19.55
cfs
Minimum Volume
4,212
4,698
8,226
cu-ft
Volume Provided
6,064
10,544
23,744
cu-ft
Minimum Surface Area
3,253
3,629
6,354
sq-ft
Surface Area Provided
3,600
6,000
12,800
sq-ft
SKIMMER SIZE
Drawdown Time
3
3
3
days
Skimmer Size
2.0
2.5
3.0
inch
Orifice Diameter
1.5
1.9
2.7
inch
Does the basin have a spillway? Yes
SPILLWAY SIZE
Spillway Dimensions
12xl.5'
12xl.5'
26xl.5'
feet
Water Depth
0.50
0.50
0.50
feet
Free -Board
1.00
1.00
1.00
feet
NCDENR E&SC Manual (Ch 6.6)
Weighted Coefficient
at TC
2:1 Min, 6:1 Max
Train for Skimmer & Basin
= Lt - 2 (Slope x Depth)
= Wt - 2 (Slope x Depth)
=DAxCxI
In NC assume 3 days
Faircloth Skimmer Chart
Faircloth Orifice Factors
Notes:
1. Spillway dimensions are based on Table 6.60a 'Design of Spillways" from the NC Erosion & Sediment Control Planning & Design
Manual
2. Rainfall Intensity, I, is obtained from Appendix 8.03.07 from the NC Erosion & Sediment Control Planning & Design Manual
3. Skimmer Design is based off of the Faircloth Skimmer Packet
4. Drawdown time is per NCDENR requirements
Issued 8/6/2020

m"I
DC__C'C,5Vpt.,PA
Southwick Solar, LLC
CDC Project No.: 12052
TEMPORARY SEDIMENT BASIN SCHEDULE
BASIN INFORMATION
Trap/Basin ID
D
Units
Basin Type
Skimmer
Maximum Drainage Area
10
acre
Drainage Area (DA)
9.60
acre
Disturbed Area
9.60
acre
Runoff Coefficient (C)
0.6
Rainfall Intensity (h0)
7.13
in/hr
Top of Water Length
180
feet
Top of Water Width
90
feet
L/W Ratio
2.0:1
feet
Water Depth
2.00
feet
Side Slope Ratio
2.00
X:1
Bottom of Basin Length
172
feet
Bottom of Basin Width
82
feet
SURFACE AREA & VOLUME
Runoff (10 Year Event)
41.07
cfs
Minimum Volume
17,280
cu-ft
Volume Provided
30,304
cu-ft
Minimum Surface Area
13,347
sq-ft
Surface Area Provided
16,200
sq-ft
SKIMMER SIZE
Drawdown Time
3
days
Skimmer Size
4.0
inch
Orifice Diameter
2.8
inch
Does the basin have a spillway? Yes
SPILLWAY SIZE
Spillway Dimensions
42xl.5'
feet
Water Depth
0.50
feet
Free -Board
1.00
feet
NCDENR E&SC Manual (Ch 6.6)
Weighted Coefficient
at TC
2:1 Min, 6:1 Max
Train for Skimmer & Basin
= Lt - 2 (Slope x Depth)
= Wt - 2 (Slope x Depth)
=DAxCxI
In NC assume 3 days
Faircloth Skimmer Chart
Faircloth Orifice Factors
Notes:
1. Spillway dimensions are based on Table 6.60a 'Design of Spillways" from the NC Erosion & Sediment Control Planning & Design
Manual
2. Rainfall Intensity, I, is obtained from Appendix 8.03.07 from the NC Erosion & Sediment Control Planning & Design Manual
3. Skimmer Design is based off of the Faircloth Skimmer Packet
4. Drawdown time is per NCDENR requirements
Issued 8/6/2020

CD Civil
Design
Concepts, PA
Southwick Solar, LLC
CDC Project No.: 12052
Faircloth Skimmer Size Chart
Size
Maximum Flow Capacities (cu-ft)
24 hrs
2 days
3 days
4 days
7 days
1.5
1,728
3,456
5,184
6,912
12,096
2
3,283
6,566
9,849
13,132
22,982
2.5
6,234
12,468
18,702
24,936
43,638
3
9,774
19,547
29,322
39,096
68,415
4
20,109
40,218
60,327
80,436
140,763
5
32,832
65,664
98,496
131,328
229,824
6
51,840
103,680
155,520
207,360
362,880
8
97,978
1 195,956
1 293,9341
391,912
1 685,846
Basin
Volume
Skimmer Size (inch)
A
6,064
2.5
2.0
2.0
1.5
1.5
B
10,544
4.0
2.5
2.5
2.0
1.5
C
23,744
5.0
4.0
3.0
2.5
2.5
D
30,304
5.0
4.0
4.0
3.0
2.5
Faircloth Orifice Factor Chart
Size
Factors (cu-ft/sq-in)
24 hrs
2 days
3 days
4 days
7 days
1.5
960
1,920
2,880
3,840
6,720
2
1,123
2,246
3,369
4,492
7,861
2.5
1,270
2,540
3,810
5,080
8,890
3
1,382
2,765
4,146
5,528
9,677
4
1,601
3,202
4,803
6,404
11,207
5
1,642
3,283
4,926
6,568
11,491
6
1,814
3,628
5,442
7,256
12,701
8
1,987
3,974
5,961
7,948
Basin
Volume
Orifice Diameter (inch)
A
6,064
2.47
1.85
1.51
1.42
1.07
B
10,544
2.90
2.30
1.88
1.73
1.41
C
23,744
4.29
3.07
2.70
2.44
1.84
D
30,304
4.85
3.47
2.83
2.64
2.08
Issued 8/6/2020

Hydrology Report
Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc. Wednesday, Jun 10 2020
TEMPORARY DITCH Al
Hydrograph type
= Rational
Peak discharge (cfs)
= 8.125
Storm frequency (yrs)
= 10
Time interval (min)
= 1
Drainage area (ac)
= 1.900
Runoff coeff. (C)
= 0.6
Rainfall Inten (in/hr)
= 7.128
Tc by User (min)
= 5
OF Curve
= 12052-Graham NC.IDF
Rec limb factor
= 1.00
Q (cfs)
10.00
P-WIT131
4.00
2.00
Runoff Hyd - Qp = 8.13 (cfs)
Runoff Hydrograph
10-yr frequency
5
Hydrograph Volume = 2,438 (cuft); 0.056 (acft)
Q (cfs)
10.00
It 1
4.00
2.00
"- 0.00
10
Time (min)

Ixy�.�u>L�x�1
NORTH
AMERICAN
GREEN'
CHANNEL ANALYSIS
> > > Temporary Ditch Al
Name
Temporary Ditch Al
Discharge
8.13
Channel Slope
0.03
Channel Bottom Width
1
Left Side Slope
2
Right Side Slope
2
Low Flow Liner
Retardence Class C 6-12 in
Vegetation Type None
Vegetation Density None
Soil Type Clay Loam (CL)
C125
North American Green
5401 St. Wendel- Cynthia na Rd.
Poseyville, Indiana 47633
Tel. [phone]
>Fax [phone]
www.nagreen.com
ECMDS v7.0
Norp al
Permissible
Calculated
Safety
Staple
Phase
Reach
Dischar a
9
Veloci ty I
De th
14—in sN
I 9
=is,,tress
Shear Stress I
Factor
Remarks
I Pattern
C125
Straight
8.13 cfs
4.23 ft/s
0.76 ft
0.035
2,3 Ibs/ft2
1.43 Ibs/ft2
1.61
STABLE
D
Unvegetat.d
Underlying
Straight
8.13 cfs 4.23 ft/s
0.76 ft
0.035 2.51 Ibs/ft2
0.82 Ibs/ft2
3.07
STABLE D
Substrate
https://ecmds.com/project/l 44455/channel-analysis/184861 /show 1 /1

Channel Report
Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc.
TEMPORARY DITCH Al
Trapezoidal
Bottom Width (ft)
= 1.00
Side Slopes (z:1)
= 2.00, 2.00
Total Depth (ft)
= 1.00
Invert Elev (ft)
= 543.50
Slope (%)
= 6.00
N-Value
= 0.035
Calculations
Compute by:
Known Q
Known Q (cfs)
= 8.13
Elev (ft)
545.00
544.50
544.00
543.50
543.00
Section
Highlighted
Depth (ft)
Q (cfs)
Area (sqft)
Velocity (ft/s)
Wetted Perim (ft)
Crit Depth, Yc (ft)
Top Width (ft)
EGL (ft)
Tuesday, Jul 21 2020
= 0.65
= 8.130
= 1.49
= 5.44
= 3.91
= 0.80
= 3.60
= 1.11
0 1 2 3 4 5 6 7
Reach (ft)
Depth (ft)
1.50
1.00
0.50
-0.50

Hydrology Report
Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc. Tuesday, Jul 21 2020
TEMPORARY DITCH A2
Hydrograph type
= Rational
Peak discharge (cfs)
= 2.181
Storm frequency (yrs)
= 10
Time interval (min)
= 1
Drainage area (ac)
= 0.510
Runoff coeff. (C)
= 0.6
Rainfall Inten (in/hr)
= 7.128
Tc by User (min)
= 5
OF Curve
= 12052-Graham NC.IDF
Rec limb factor
= 1.00
Q (cfs)
3.00
2.00
1.00
e
Runoff Hyd - Qp = 2.18 (cfs)
Runoff Hydrograph
10-yr frequency
5
Hydrograph Volume = 654 (cuft); 0.015 (acft)
Q (cfs)
3.00
2.00
1.00
'-- 0.00
10
Time (min)

Ixy�.�u>L�x�1
NORTH
AMERICAN
GREEN'
CHANNEL ANALYSIS
> > > Temporary Ditch A2
Name
Temporary Ditch A2
Discharge
2.181
Channel Slope
0.13
Channel Bottom Width
1
Left Side Slope
2
Right Side Slope
2
Low Flow Liner
Retardence Class C 6-12 in
Vegetation Type None
Vegetation Density None
Soil Type Clay Loam (CL)
C125BN
North American Green
5401 St. Wendel- Cynthia na Rd.
Poseyville, Indiana 47633
Tel. [phone]
>Fax [phone]
www.nagreen.com
ECMDS v7.0
Norp al
Permissible
Calculated
Safety
Staple
Phase
Reach
Dischar a
9
Veloci ty I
De th
14—in sN
I 9
=is,,tress
Shear Stress I
Factor
Remarks
I Pattern
C125BN
Straight
2.18 cfs
5.09 ft/s
0.28 ft
0.035
2,8 Ibs/ft2
2.24 Ibs/ft2
1.25
STABLE
D
Unvegetated
Underlying
Straight
2.18 cfs 5.09 ft/s
0.28 ft
0.035 3.05 Ibs/ft2
1.55 Ibs/ft2
1.96
STABLE D
Substrate
https://ecmds.com/project/l 44455/channel-analysis/184862/show 1 /1

Channel Report
Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc.
TEMPORARY DITCH A2
Trapezoidal
Bottom Width (ft)
= 1.00
Side Slopes (z:1)
= 2.00, 2.00
Total Depth (ft)
= 1.00
Invert Elev (ft)
= 548.60
Slope (%)
= 12.00
N-Value
= 0.035
Calculations
Compute by:
Known Q
Known Q (cfs)
= 2.18
Elev (ft)
550.00
v
549.50
549.00
548.50
548.00
Section
Highlighted
Depth (ft)
Q (cfs)
Area (sqft)
Velocity (ft/s)
Wetted Perim (ft)
Crit Depth, Yc (ft)
Top Width (ft)
EGL (ft)
Tuesday, Jul 21 2020
= 0.29
= 2.180
= 0.46
= 4.76
= 2.30
= 0.41
= 2.16
= 0.64
0 1 2 3 4 5 6 7
Reach (ft)
Depth (ft)
1.40
0.40
-0.10

Hydrology Report
Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc. Thursday, Jul 23 2020
TEMPORARY DITCH 131
Hydrograph type
= Rational
Peak discharge (cfs)
= 4.961
Storm frequency (yrs)
= 10
Time interval (min)
= 1
Drainage area (ac)
= 1.160
Runoff coeff. (C)
= 0.6
Rainfall Inten (in/hr)
= 7.128
Tc by User (min)
= 5
OF Curve
= 12052-Graham NC.IDF
Rec limb factor
= 1.00
Q (cfs)
5.00
4.00
3.00
2.00
1.00
0.00 -Y
0
Runoff Hyd - Qp = 4.96 (cfs)
Runoff Hydrograph
10-yr frequency
5
Hydrograph Volume = 1,488 (cuft); 0.034 (acft)
Q (cfs)
5.00
4.00
3.00
2.00
1.00
-X- 0.00
10
Time (min)

r51MAKIM
Ixy�.�u>L�x�1
NORTH
AMERICAN
GREEN'
CHANNEL ANALYSIS
> > > Temporary Ditch B1
Name
Temporary Ditch B1
Discharge
4.961
Channel Slope
0.06
Channel Bottom Width
1
Left Side Slope
2
Right Side Slope
2
Low Flow Liner
Retardence Class C 6-12 in
Vegetation Type None
Vegetation Density None
Soil Type Clay Loam (CL)
C125
North American Green
5401 St. Wendel- Cynthia na Rd.
Poseyville, Indiana 47633
Tel. [phone]
>Fax [phone]
www.nagreen.com
ECMDS v7.0
Norp al
Permissible
Calculated
Safety
Staple
Phase
Reach
Dischar a
9
Veloci ty I
De th
14—in sN
I 9
=is,,tress
Shear Stress I
Factor
Remarks
I Pattern
C125
Straight
4.96 cfs
4.81 ft/s
0.51 ft
0.035
2,3 Ibs/ft2
1.91 Ibs/ft2
1.2
STABLE
D
Unvegetat.d
Underlying
Straight
4.96 cfs 4.81 ft/s
0.51 ft
0.035 2.51 Ibs/ft2
1.18 Ibs/ft2
2.13
STABLE D
Substrate
https://ecmds.com/project/l 44455/channel-analysis/184863/show 1 /1

Channel Report
Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc.
TEMPORARY DITCH
131
Trapezoidal
Bottom Width (ft)
= 1.00
Side Slopes (z:1)
= 2.00, 2.00
Total Depth (ft)
= 1.00
Invert Elev (ft)
= 560.40
Slope (%)
= 6.00
N-Value
= 0.035
Calculations
Compute by:
Known Q
Known Q (cfs)
= 4.96
Elev (ft)
562.00
561.50
561.00
560.50
560.00
559.50
Section
Thursday, Jul 23 2020
Highlighted
Depth (ft)
= 0.52
Q (cfs)
= 4.960
Area (sqft)
= 1.06
Velocity (ft/s)
= 4.68
Wetted Perim (ft)
= 3.33
Crit Depth, Yc (ft)
= 0.62
Top Width (ft)
= 3.08
EGL (ft)
= 0.86
0 1 2 3 4 5 6 7
Reach (ft)
Depth (ft)
1.60
1.10
0.10
-0.40

Hydrology Report
Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc. Thursday, Jul 23 2020
TEMPORARY DITCH B2
Hydrograph type
= Rational
Peak discharge (cfs)
= 1.026
Storm frequency (yrs)
= 10
Time interval (min)
= 1
Drainage area (ac)
= 0.240
Runoff coeff. (C)
= 0.6
Rainfall Inten (in/hr)
= 7.128
Tc by User (min)
= 5
OF Curve
= 12052-Graham NC.IDF
Rec limb factor
= 1.00
Q (cfs)
2.00
1.00
RM
0
Runoff Hyd - Qp = 1.03 (cfs)
Runoff Hydrograph
10-yr frequency
5
Hydrograph Volume = 308 (cuft); 0.007 (acft)
Q (cfs)
2.00
1.00
SL 0.00
10
Time (min)

r51MAKIM
Ixy�.�u>L�x�1
NORTH
AMERICAN
GREEN'
CHANNEL ANALYSIS
> > > Temporary Ditch B2
Name
Temporary Ditch B2
Discharge
1.026
Channel Slope
0.07
Channel Bottom Width
1
Left Side Slope
2
Right Side Slope
2
Low Flow Liner
Retardence Class C 6-12 in
Vegetation Type None
Vegetation Density None
Soil Type Clay Loam (CL)
C125
North American Green
5401 St. Wendel- Cynthia na Rd.
Poseyville, Indiana 47633
Tel. [phone]
>Fax [phone]
www.nagreen.com
ECMDS v7.0
Norp al
Permissible
Calculated
Safety
Staple
Phase
Reach
Dischar a
9
Veloci ty I
De th
14—in sN
I 9
=is,,tress
Shear Stress I
Factor
Remarks
I Pattern
C125
Straight
1.03 cfs
3.28 ft/s
0.22 ft
0.035
2,3 Ibs/ft2
0.95 Ibs/ft2
2.42
STABLE
D
Unvegetat.d
Underlying
Straight
1.03 cfs 3.29 ft/s
0.22 ft
0.035 2.51 Ibs/ft2
0.69 Ibs/ft2
3.62
STABLE D
Substrate
https://ecmds.com/project/l 44455/channel-analysis/184864/show 1 /1

Channel Report
Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc.
TEMPORARY DITCH
132
Trapezoidal
Bottom Width (ft)
= 1.00
Side Slopes (z:1)
= 2.00, 2.00
Total Depth (ft)
= 1.00
Invert Elev (ft)
= 549.60
Slope (%)
= 7.00
N-Value
= 0.035
Calculations
Compute by:
Known Q
Known Q (cfs)
= 1.03
Elev (ft)
551.00
550.50
550.00
549.50
549.00
Section
Highlighted
Depth (ft)
Q (cfs)
Area (sqft)
Velocity (ft/s)
Wetted Perim (ft)
Crit Depth, Yc (ft)
Top Width (ft)
EGL (ft)
Thursday, Jul 23 2020
= 0.22
= 1.030
= 0.32
= 3.25
= 1.98
= 0.27
= 1.88
= 0.38
0 1 2 3 4 5 6 7
Reach (ft)
Depth (ft)
1.40
0.40
-0.10

Hydrology Report
Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc. Thursday, Aug 6 2020
TEMPORARY DITCH C1
Hydrograph type
= Rational
Peak discharge (cfs)
= 11.80
Storm frequency (yrs)
= 10
Time interval (min)
= 1
Drainage area (ac)
= 2.760
Runoff coeff. (C)
= 0.6
Rainfall Inten (in/hr)
= 7.128
Tc by User (min)
= 5
OF Curve
= 12052-Graham NC.IDF
Rec limb factor
= 1.00
Q (cfs)
12.00
10.00
: M
.M
4.00
2.00
0.00 -Y
0
Runoff Hyd - Qp = 11.80 (cfs)
Runoff Hydrograph
10-yr frequency
5
Hydrograph Volume = 3,541 (cuft); 0.081 (acft)
Q (cfs)
12.00
10.00
4.00
2.00
'- 0.00
10
Time (min)

rMAXIM
NORTH
AMERICAN
GREEN'
CHANNEL ANALYSIS
> > > Temporary Ditch C1
Name
Temporary Ditch C1
Discharge
11.8
Channel Slope
0.065
Channel Bottom Width
2
Left Side Slope
2
Right Side Slope
2
Low Flow Liner
Retardence Class C 6-12 in
Vegetation Type None
Vegetation Density None
Soil Type Clay Loam (CL)
C125BN
North American Green
5401 St. Wendel- Cynthia na Rd.
Poseyville, Indiana 47633
Tel. [phone]
>Fax [phone]
www.nagreen.com
ECMDS v7.0
Norp al
Permissible
Calculated
Safety
Staple
Phase
Reach
Dischar a
9
Veloci ty I
De th
14—in sN
I 9
=is,,tress
Shear Stress I
Factor
Remarks
I Pattern
C125BN
Straight
11.8 cfs
6.02 ft/s
0.61 ft
0.035
2,8 Ibs/ft2
2.47 Ibs/ft2
1.13
STABLE
D
Unvegetated
Underlying
Straight
11.8 cfs 6.02 ft/s
0.61 ft
0.035 3.05 Ibs/ft2
1.68 Ibs/ft2
1.81
STABLE D
Substrate
https://ecmds.com/project/l 44455/channel-analysis/186778/show 1 /1

Channel Report
Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc.
TEMPORARY DITCH C1
Trapezoidal
Bottom Width (ft)
= 2.00
Side Slopes (z:1)
= 2.00, 2.00
Total Depth (ft)
= 1.00
Invert Elev (ft)
= 538.50
Slope (%)
= 6.50
N-Value
= 0.035
Calculations
Compute by:
Known Q
Known Q (cfs)
= 11.80
Elev (ft)
540.00
539.50
539.00
538.50
538.00
Section
D 1 2 3 4
Reach (ft)
Highlighted
Depth (ft)
Q (cfs)
Area (sqft)
Velocity (ft/s)
Wetted Perim (ft)
Crit Depth, Yc (ft)
Top Width (ft)
EGL (ft)
5 6 7
Thursday, Aug 6 2020
= 0.61
= 11.80
= 1.96
= 6.01
= 4.73
= 0.79
= 4.44
= 1.17
Depth (ft)
1.50
1.00
0.50
L -0.50
8

Hydrology Report
Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc.
TEMPORARY DITCH C2
Hydrograph type
= Rational
Storm frequency (yrs)
= 10
Drainage area (ac)
= 0.076
Rainfall Inten (in/hr)
= 7.128
OF Curve
= 12052-Graham NC.IDF
Q (cfs)
0.50
0.45
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0.00 L
0
Runoff Hyd - Qp = 0.33 (cfs)
Thursday, Aug 6 2020
Peak discharge (cfs) = 0.325
Time interval (min) = 1
Runoff coeff. (C) = 0.6
Tc by User (min) = 5
Rec limb factor = 1.00
Runoff Hydrograph
10-yr frequency
5
Hydrograph Volume = 98 (cult); 0.002 (acft)
Q (cfs)
0.50
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0 00
10
Time (min)

rMAXIM
NORTH
AMERICAN
GREEN'
CHANNEL ANALYSIS
> > > Temporary Ditch C2
Name
Temporary Ditch C2
Discharge
0.0325
Channel Slope
0.017
Channel Bottom Width
1
Left Side Slope
2
Right Side Slope
2
Low Flow Liner
Retardence Class C 6-12 in
Vegetation Type None
Vegetation Density None
Soil Type Clay Loam (CL)
C125BN
North American Green
5401 St. Wendel- Cynthia na Rd.
Poseyville, Indiana 47633
Tel. [phone]
>Fax [phone]
www.nagreen.com
ECMDS v7.0
Norp al
Permissible
Calculated
Safety
Staple
Phase
Reach
Dischar a
9
Veloci ty I
De th
14—in sN
I 9
=is,,tress
Shear Stress I
Factor
Remarks
I Pattern
C125BN
Straight
0.03 cfs
0.66 ft/s
0.05 ft
0.035
2,8 Ibs/ft2
0.05 Ibs/ft2
58.46
STABLE
D
Unvegetated
Underlying
Straight
0.03 cfs 0.64 ft/s
0.04 ft
0.035 3.05 Ibs/ft2
0.04 Ibs/ft2
73.2
STABLE D
Substrate
https://ecmds.com/project/l 44455/channel-analysis/186791 /show 1 /1

Channel Report
Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc.
TEMPORARY DITCH C2
Trapezoidal
Bottom Width (ft)
= 1.00
Side Slopes (z:1)
= 2.00, 2.00
Total Depth (ft)
= 1.00
Invert Elev (ft)
= 510.50
Slope (%)
= 1.70
N-Value
= 0.035
Calculations
Compute by:
Known Q
Known Q (cfs)
= 0.33
Elev (ft)
512.00
511.50
511.00
510.50
510.00
Section
Highlighted
Depth (ft)
Q (cfs)
Area (sqft)
Velocity (ft/s)
Wetted Perim (ft)
Crit Depth, Yc (ft)
Top Width (ft)
EGL (ft)
Thursday, Aug 6 2020
= 0.18
= 0.330
= 0.24
= 1.35
= 1.80
= 0.14
= 1.72
= 0.21
0 1 2 3 4 5 6 7
Reach (ft)
Depth (ft)
1.50
1.00
0.50
-0.50

Hydrology Report
Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc.
Thursday, Aug 6 2020
TEMPORARY DITCH
D1
Hydrograph type =
Rational
Peak discharge (cfs)
= 34.94
Storm frequency (yrs) =
10
Time interval (min)
= 1
Drainage area (ac) =
8.170
Runoff coeff. (C)
= 0.6
Rainfall Inten (in/hr) =
7.128
Tc by User (min)
= 5
OF Curve =
12052-Graham NC.IDF
Rec limb factor
= 1.00
Q (cfs)
35.00
30.00
25.00
20.00
15.00
10.00
5.00
0.00 -y
0
Runoff Hyd - Qp = 34.94 (cfs)
Runoff Hydrograph
10-yr frequency
5
Hydrograph Volume = 10,482 (cult); 0.241 (acft)
Q (cfs)
35.00
30.00
25.00
20.00
15.00
10.00
5.00
0.00
10
Time (min)

rMAXIM
NORTH
AMERICAN
GREEN'
CHANNEL ANALYSIS
> > > Temporary Ditch D1
Name
Temporary Ditch D1
Discharge
34.94
Channel Slope
0.04
Channel Bottom Width
3
Left Side Slope
2
Right Side Slope
2
Low Flow Liner
Retardence Class C 6-12 in
Vegetation Type None
Vegetation Density None
Soil Type Clay Loam (CL)
C125BN
North American Green
5401 St. Wendel- Cynthia na Rd.
Poseyville, Indiana 47633
Tel. [phone]
>Fax [phone]
www.nagreen.com
ECMDS v7.0
Norp al
Permissible
Calculated
Safety
Staple
Phase
Reach
Dischar a
9
Veloci ty I
De th
14—in sN
I 9
=is,,tress
Shear Stress I
Factor
Remarks
I Pattern
C125BN
Straight
34.94 cfs
6.63 ft/s
1.04 ft
0.035
2,8 Ibs/ft2
2.59 Ibs/ft2
1.08
STABLE
D
Unvegetated
Underlying
Straight
34.94 cfs 6.63 ft/s
1.04 ft
0.035 3.05 Ibs/ft2
1.72 Ibs/ft2
1.77
STABLE D
Substrate
https://ecmds.com/project/l 44455/channel-analysis/186792/show 1 /1

Channel Report
Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc.
TEMPORARY DITCH
D1
Trapezoidal
Bottom Width (ft)
= 3.00
Side Slopes (z:1)
= 2.00, 2.00
Total Depth (ft)
= 1.50
Invert Elev (ft)
= 536.41
Slope (%)
= 4.00
N-Value
= 0.035
Calculations
Compute by:
Known Q
Known Q (cfs)
= 34.94
Elev (ft) Section
538.00
537.50
537.00
536.50
536.00
535.50
Highlighted
Depth (ft)
Q (cfs)
Area (sqft)
Velocity (ft/s)
Wetted Perim (ft)
Crit Depth, Yc (ft)
Top Width (ft)
EGL (ft)
Thursday, Aug 6 2020
= 1.04
= 34.94
= 5.28
= 6.61
= 7.65
= 1.23
= 7.16
= 1.72
1 2 3 4 5 6 7 8 9 10 11
Reach (ft)
Depth (ft)
1.59
1.09
0.59
-0.41
_n 01

Hydrology Report
Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc. Tuesday, Jul 21 2020
TEMPORARY BYPASS DITCH
Hydrograph type
= Rational
Peak discharge (cfs)
= 17.11
Storm frequency (yrs)
= 10
Time interval (min)
= 1
Drainage area (ac)
= 4.000
Runoff coeff. (C)
= 0.6
Rainfall Inten (in/hr)
= 7.128
Tc by User (min)
= 5
OF Curve
= 12052-Graham NC.IDF
Rec limb factor
= 1.00
Q (cfs)
18.00
15.00
12.00
• m
.M
3.00
0.00 -Y
0
Runoff Hyd - Qp = 17.11 (cfs)
Runoff Hydrograph
10-yr frequency
5
Hydrograph Volume = 5,132 (cuft); 0.118 (acft)
Q (cfs)
18.00
15.00
12.00
• wo]
3.00
'-- 0.00
10
Time (min)

Ixy�.�u>L�x�1
NORTH
AMERICAN
GREEN'
CHANNEL ANALYSIS
> > > Temporary Ditch BYPASS
Name
Temporary Ditch BYPASS
Discharge
17.11
Channel Slope
0.026
Channel Bottom Width
1
Left Side Slope
2
Right Side Slope
2
Low Flow Liner
Retardence Class C 6-12 in
Vegetation Type None
Vegetation Density None
Soil Type Clay Loam (CL)
C125
North American Green
5401 St. Wendel- Cynthia na Rd.
Poseyville, Indiana 47633
Tel. [phone]
>Fax [phone]
www.nagreen.com
ECMDS v7.0
Norp al
Permissible
Calculated
Safety
Staple
Phase
Reach
Dischar a
9
Veloci ty I
De th
14—in sN
I 9
=is,,tress
Shear Stress I
Factor
Remarks
I Pattern
C125
Straight
17.11 cfs
4.84 ft/s
1.1 ft
0.035
2,3 Ibs/ft2
1.79 lbs/ft2
1.29
STABLE
D
Unvegetated
Underlying
Straight
17.11 cfs 4.84 ft/s
1.1 ft
0.035 2.51 Ibs/ft2
0.97 Ibs/ft2
2.6
STABLE D
Substrate
https://ecmds.com/project/l 44455/channel-analysis/186793/show 1 /1

Channel Report
Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc.
TEMPORARY BYPASS
DITCH
Trapezoidal
Bottom Width (ft)
= 1.00
Side Slopes (z:1)
= 2.00, 2.00
Total Depth (ft)
= 1.50
Invert Elev (ft)
= 567.30
Slope (%)
= 2.60
N-Value
= 0.035
Calculations
Compute by:
Known Q
Known Q (cfs)
= 17.11
Elev (ft)
569.00
568.50
568.00
567.50
567.00
566.50
Section
Tuesday, Jul 21 2020
Highlighted
Depth (ft)
= 1.11
Q (cfs)
= 17.11
Area (sqft)
= 3.57
Velocity (ft/s)
= 4.79
Wetted Perim (ft)
= 5.96
Crit Depth, Yc (ft)
= 1.14
Top Width (ft)
= 5.44
EGL (ft)
= 1.47
1 2 3 4 5 6 7 8
Reach (ft)
Depth (ft)
1.70
1.20
0.70
0.20
-0.30

Culvert Calculations:

Hydrology Report
Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc. Thursday, Jun 11 2020
DRIVEWAY CULVERT
Hydrograph type
= Rational
Peak discharge (cfs)
= 2.138
Storm frequency (yrs)
= 10
Time interval (min)
= 1
Drainage area (ac)
= 0.500
Runoff coeff. (C)
= 0.6
Rainfall Inten (in/hr)
= 7.128
Tc by User (min)
= 5
OF Curve
= 12052-Graham NC.IDF
Rec limb factor
= 1.00
Q (cfs)
3.00
2.00
1.00
MM
I
Runoff Hyd - Qp = 2.14 (cfs)
Runoff Hydrograph
10-yr frequency
5
Hydrograph Volume = 641 (cuft); 0.015 (acft)
Q (cfs)
3.00
2.00
1.00
X- 0.00
10
Time (min)

Culvert Report
Hydraflow Express Extension for Autodesk® Civil 3D® by Autodesk, Inc. Thursday, Jun 11 2020
DRIVEWAY CULVERT
Invert Elev Dn (ft)
= 559.50
Calculations
Pipe Length (ft)
= 35.00
Qmin (cfs)
= 2.14
Slope (%)
= 4.91
Qmax (cfs)
= 2.14
Invert Elev Up (ft)
= 561.22
Tailwater Elev (ft)
= (dc+D)/2
Rise (in)
= 15.0
Shape
= Circular
Highlighted
Span (in)
= 15.0
Qtotal (cfs)
= 2.14
No. Barrels
= 1
Qpipe (cfs)
= 2.14
n-Value
= 0.012
Qovertop (cfs)
= 0.00
Culvert Type
= Circular Corrugate Metal Pipe
Veloc Dn (ft/s)
= 2.22
Culvert Entrance
= Projecting
Veloc Up (ft/s)
= 3.81
Coeff. K,M,c,Y,k
= 0.034, 1.5, 0.0553, 0.54, 0.9
HGL Dn (ft)
= 560.42
HGL Up (ft)
= 561.80
Embankment
Hw Elev (ft)
= 562.08
Top Elevation (ft)
= 562.70
Hw/D (ft)
= 0.69
Top Width (ft)
= 24.00
Flow Regime
= Inlet Control
Crest Width (ft)
= 50.00
Ele (ft)
563.❑D
562.00
561.00
560.00
559A0
558. 00
DRIVEWAY CULVERT
5 10 15 20 25 30 35 40 45 5❑
Circular G.1-1t HGL Embank
ft Depth (Rj
1.78
0.78
-0-M
-1.22
-2.22
-3 22
55
Reach (fh

Rip -Rap Apron Calculations:

Appendices
-4— t�� I
Outlet W = Do + La
pipe I
diameter (Do)
�—La
:-,:�Tlajil�lwatter --� 0.5DO
APRON DEPTH IS 1.5 TIMES THE STONE
DIAMETER (18" MINIMUM DEPTH)
10 F�'
(MIN. LENGTH)
2 NCn
CL
Cr
(D
Ln
0.50 FT
(MIN. d50)
50 100
Discharge (0/sec)
Curves may not be extrapolated.
Figure 8.06a Design of outlet protection protection from a round pipe flowing full, minimum tailwater condition (Tw < 0.5 diameter).
STRUCTURE: TEMP DITCH Al LENGTH: 10 ft
DISCHARGE: 8.13 cfs WIDTH: 11 ft
PIPE DIA. (D) 12 in d50: 0.5 ft
DEPTH: 1.5 ft
Rev. 12/93 8.06.3

Appendices
Curves may not be extrapolated.
Figure 8.06a Design of outlet protection protection from a round pipe flowing full, minimum tailwater condition (Tw < 0.5 diameter).
STRUCTURE: TEMP DITCH A2 LENGTH: 14 ft
DISCHARGE: 2.18 cfs WIDTH: 15 ft
PIPE DIA. (D) 12 in d5O: 0.5 ft
DEPTH: 1.5 ft
Rev. 12/93 8.06.3

Appendices
Curves may not be extrapolated.
Figure 8.06a Design of outlet protection protection from a round pipe flowing full, minimum tailwater condition (Tw < 0.5 diameter).
STRUCTURE: TEMP DITCH 131 LENGTH: 10 ft
DISCHARGE: 4.96 cfs WIDTH: 11 ft
PIPE DIA. (D) 12 in d5O: 0.5 ft
DEPTH: 1.5 ft
Rev. 12/93 8.06.3

Appendices
-4— t�� I
Outlet W = Do + La
pipe I
diameter (Do)
�—La
:-,:�Tlajil�lwatter --� 0.5DO
APRON DEPTH IS 1.5 TIMES THE STONE
DIAMETER (18" MINIMUM DEPTH)
10 FT
(MIN. LENGTH)
2 NCn
CL
Cr
(D
Ln
0.50 FT
(MIN. d50)
50 100
Discharge (0/sec)
Curves may not be extrapolated.
Figure 8.06a Design of outlet protection protection from a round pipe flowing full, minimum tailwater condition (Tw < 0.5 diameter).
STRUCTURE: TEMP DITCH B2 LENGTH: 10 ft
DISCHARGE: 1.03 cfs WIDTH: 11 ft
PIPE DIA. (D) 12 in d50: 0.5 ft
DEPTH: 1.5 ft
Rev. 12/93 8.06.3

Appendices
Curves may not be extrapolated.
Figure 8.06a Design of outlet protection protection from a round pipe flowing full, minimum tailwater condition (Tw < 0.5 diameter).
STRUCTURE: TEMP. DITCH C1 LENGTH: 14 ft
DISCHARGE: 11.80 cfs WIDTH: 15 ft
PIPE DIA. (D) 12 in d5O: 0.50 ft
DEPTH: 1.5 ft
Rev. 12/93 8.06.3

Appendices
Curves may not be extrapolated.
Figure 8.06a Design of outlet protection protection from a round pipe flowing full, minimum tailwater condition (Tw < 0.5 diameter).
STRUCTURE: TEMP. DITCH C2 LENGTH: 10 ft
DISCHARGE: 0.33 cfs WIDTH: 11 ft
PIPE DIA. (D) 12 in d5O: 0.50 ft
DEPTH: 1.5 ft
Rev. 12/93 8.06.3

Appendices
Curves may not be extrapolated.
Figure 8.06a Design of outlet protection protection from a round pipe flowing full, minimum tailwater condition (Tw < 0.5 diameter).
STRUCTURE: TEMP. DITCH D1 LENGTH: 16 ft
DISCHARGE: 34.94 cfs WIDTH: 17.5 ft
PIPE DIA. (D) 18 in d5O: 0.6 ft
DEPTH: 1.5 ft
Rev. 12/93 8.06.3

Appendices
Curves may not be extrapolated.
Figure 8.06a Design of outlet protection protection from a round pipe flowing full, minimum tailwater condition (Tw < 0.5 diameter).
STRUCTURE: TEMP BYPASS DITCH LENGTH: 10 ft
DISCHARGE: 17.11 cfs WIDTH: 11.5 ft
PIPE DIA. (D) 18 in d5O: 0.50 ft
DEPTH: 1.5 ft
Rev. 12/93 8.06.3

NRCS Soil Report:

USDA United States
Department of
Agriculture
N RCS
Natural
Resources
Conservation
Service
A product of the National
Cooperative Soil Survey,
a joint effort of the United
States Department of
Agriculture and other
Federal agencies, State
agencies including the
Agricultural Experiment
Stations, and local
participants
Custom Soil Resource
Report for
Alamance County,
North Carolina
SOUTHWICK SOLAR, LLC
June 8, 2020

Preface
Soil surveys contain information that affects land use planning in survey areas.
They highlight soil limitations that affect various land uses and provide information
about the properties of the soils in the survey areas. Soil surveys are designed for
many different users, including farmers, ranchers, foresters, agronomists, urban
planners, community officials, engineers, developers, builders, and home buyers.
Also, conservationists, teachers, students, and specialists in recreation, waste
disposal, and pollution control can use the surveys to help them understand,
protect, or enhance the environment.
Various land use regulations of Federal, State, and local governments may impose
special restrictions on land use or land treatment. Soil surveys identify soil
properties that are used in making various land use or land treatment decisions.
The information is intended to help the land users identify and reduce the effects of
soil limitations on various land uses. The landowner or user is responsible for
identifying and complying with existing laws and regulations.
Although soil survey information can be used for general farm, local, and wider area
planning, onsite investigation is needed to supplement this information in some
cases. Examples include soil quality assessments (http://www.nres.usda.gov/wps/
portal/nres/main/soils/health/) and certain conservation and engineering
applications. For more detailed information, contact your local USDA Service Center
(https:Hoffices.sc.egov.usda.gov/locator/app?agency=nres) or your NRCS State Soil
Scientist (http://www.nres.usda.gov/wps/portal/nres/detail/soils/contactus/?
cid=nres142p2_053951).
Great differences in soil properties can occur within short distances. Some soils are
seasonally wet or subject to flooding. Some are too unstable to be used as a
foundation for buildings or roads. Clayey or wet soils are poorly suited to use as
septic tank absorption fields. A high water table makes a soil poorly suited to
basements or underground installations.
The National Cooperative Soil Survey is a joint effort of the United States
Department of Agriculture and other Federal agencies, State agencies including the
Agricultural Experiment Stations, and local agencies. The Natural Resources
Conservation Service (NRCS) has leadership for the Federal part of the National
Cooperative Soil Survey.
Information about soils is updated periodically. Updated information is available
through the NRCS Web Soil Survey, the site for official soil survey information.
The U.S. Department of Agriculture (USDA) prohibits discrimination in all its
programs and activities on the basis of race, color, national origin, age, disability,
and where applicable, sex, marital status, familial status, parental status, religion,
sexual orientation, genetic information, political beliefs, reprisal, or because all or a
part of an individual's income is derived from any public assistance program. (Not
all prohibited bases apply to all programs.) Persons with disabilities who require

alternative means for communication of program information (Braille, large print,
audiotape, etc.) should contact USDA's TARGET Center at [phone] (voice
and TDD). To file a complaint of discrimination, write to USDA, Director, Office of
Civil Rights, 1400 Independence Avenue, S.W., Washington, D.C. 20250-9410 or
call [phone] (voice) or [phone] (TDD). USDA is an equal opportunity
provider and employer.

Contents
Preface....................................................................................................................
2
How Soil Surveys Are Made..................................................................................5
SoilMap..................................................................................................................
8
SoilMap................................................................................................................9
Legend................................................................................................................10
MapUnit Legend................................................................................................
11
MapUnit Descriptions.........................................................................................11
Alamance County, North Carolina...................................................................13
CnB2—Cullen clay loam, 2 to 6 percent slopes, moderately eroded ..........
13
CnC2—Cullen clay loam, 6 to 10 percent slopes, moderately eroded ........
14
CnD2—Cullen clay loam, 10 to 15 percent slopes, moderately eroded ......
15
CnE2—Cullen clay loam, 15 to 45 percent slopes, moderately eroded ......
16
RvA—Riverview loam, 0 to 2 percent slopes, occasionally flooded ............
17
W—Water....................................................................................................18
References............................................................................................................
20

How Soil Surveys Are Made
Soil surveys are made to provide information about the soils and miscellaneous
areas in a specific area. They include a description of the soils and miscellaneous
areas and their location on the landscape and tables that show soil properties and
limitations affecting various uses. Soil scientists observed the steepness, length,
and shape of the slopes; the general pattern of drainage; the kinds of crops and
native plants; and the kinds of bedrock. They observed and described many soil
profiles. A soil profile is the sequence of natural layers, or horizons, in a soil. The
profile extends from the surface down into the unconsolidated material in which the
soil formed or from the surface down to bedrock. The unconsolidated material is
devoid of roots and other living organisms and has not been changed by other
biological activity.
Currently, soils are mapped according to the boundaries of major land resource
areas (MLRAs). MLRAs are geographically associated land resource units that
share common characteristics related to physiography, geology, climate, water
resources, soils, biological resources, and land uses (USDA, 2006). Soil survey
areas typically consist of parts of one or more MLRA.
The soils and miscellaneous areas in a survey area occur in an orderly pattern that
is related to the geology, landforms, relief, climate, and natural vegetation of the
area. Each kind of soil and miscellaneous area is associated with a particular kind
of landform or with a segment of the landform. By observing the soils and
miscellaneous areas in the survey area and relating their position to specific
segments of the landform, a soil scientist develops a concept, or model, of how they
were formed. Thus, during mapping, this model enables the soil scientist to predict
with a considerable degree of accuracy the kind of soil or miscellaneous area at a
specific location on the landscape.
Commonly, individual soils on the landscape merge into one another as their
characteristics gradually change. To construct an accurate soil map, however, soil
scientists must determine the boundaries between the soils. They can observe only
a limited number of soil profiles. Nevertheless, these observations, supplemented
by an understanding of the soil -vegetation -landscape relationship, are sufficient to
verify predictions of the kinds of soil in an area and to determine the boundaries.
Soil scientists recorded the characteristics of the soil profiles that they studied. They
noted soil color, texture, size and shape of soil aggregates, kind and amount of rock
fragments, distribution of plant roots, reaction, and other features that enable them
to identify soils. After describing the soils in the survey area and determining their
properties, the soil scientists assigned the soils to taxonomic classes (units).
Taxonomic classes are concepts. Each taxonomic class has a set of soil
characteristics with precisely defined limits. The classes are used as a basis for
comparison to classify soils systematically. Soil taxonomy, the system of taxonomic
classification used in the United States, is based mainly on the kind and character
of soil properties and the arrangement of horizons within the profile. After the soil

Custom Soil Resource Report
scientists classified and named the soils in the survey area, they compared the
individual soils with similar soils in the same taxonomic class in other areas so that
they could confirm data and assemble additional data based on experience and
research.
The objective of soil mapping is not to delineate pure map unit components; the
objective is to separate the landscape into landforms or landform segments that
have similar use and management requirements. Each map unit is defined by a
unique combination of soil components and/or miscellaneous areas in predictable
proportions. Some components may be highly contrasting to the other components
of the map unit. The presence of minor components in a map unit in no way
diminishes the usefulness or accuracy of the data. The delineation of such
landforms and landform segments on the map provides sufficient information for the
development of resource plans. If intensive use of small areas is planned, onsite
investigation is needed to define and locate the soils and miscellaneous areas.
Soil scientists make many field observations in the process of producing a soil map.
The frequency of observation is dependent upon several factors, including scale of
mapping, intensity of mapping, design of map units, complexity of the landscape,
and experience of the soil scientist. Observations are made to test and refine the
soil -landscape model and predictions and to verify the classification of the soils at
specific locations. Once the soil -landscape model is refined, a significantly smaller
number of measurements of individual soil properties are made and recorded.
These measurements may include field measurements, such as those for color,
depth to bedrock, and texture, and laboratory measurements, such as those for
content of sand, silt, clay, salt, and other components. Properties of each soil
typically vary from one point to another across the landscape.
Observations for map unit components are aggregated to develop ranges of
characteristics for the components. The aggregated values are presented. Direct
measurements do not exist for every property presented for every map unit
component. Values for some properties are estimated from combinations of other
properties.
While a soil survey is in progress, samples of some of the soils in the area generally
are collected for laboratory analyses and for engineering tests. Soil scientists
interpret the data from these analyses and tests as well as the field -observed
characteristics and the soil properties to determine the expected behavior of the
soils under different uses. Interpretations for all of the soils are field tested through
observation of the soils in different uses and under different levels of management.
Some interpretations are modified to fit local conditions, and some new
interpretations are developed to meet local needs. Data are assembled from other
sources, such as research information, production records, and field experience of
specialists. For example, data on crop yields under defined levels of management
are assembled from farm records and from field or plot experiments on the same
kinds of soil.
Predictions about soil behavior are based not only on soil properties but also on
such variables as climate and biological activity. Soil conditions are predictable over
long periods of time, but they are not predictable from year to year. For example,
soil scientists can predict with a fairly high degree of accuracy that a given soil will
have a high water table within certain depths in most years, but they cannot predict
that a high water table will always be at a specific level in the soil on a specific date.
After soil scientists located and identified the significant natural bodies of soil in the
survey area, they drew the boundaries of these bodies on aerial photographs and

Custom Soil Resource Report
identified each as a specific map unit. Aerial photographs show trees, buildings,
fields, roads, and rivers, all of which help in locating boundaries accurately.

Soil Map
The soil map section includes the soil map for the defined area of interest, a list of
soil map units on the map and extent of each map unit, and cartographic symbols
displayed on the map. Also presented are various metadata about data used to
produce the map, and a description of each soil map unit.

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Custom Soil Resource Report
Map Unit Legend
Map Unit Symbol
Map Unit Name
Acres in AOI
Percent of AOI
CnB2
Cullen clay loam, 2 to 6 percent
19.7
32.2%
slopes, moderately eroded
CnC2
Cullen clay loam, 6 to 10
8.7
14.3%
percent slopes, moderately
eroded
CnD2
Cullen clay loam, 10 to 15
4.8
7.8%
percent slopes, moderately
eroded
CnE2
Cullen clay loam, 15 to 45
13.3
21.7%
percent slopes, moderately
eroded
RvA
Riverview loam, 0 to 2 percent
14.4
23.5%
slopes, occasionally flooded
W
Water
0.3
0.5%
Totals for Area of Interest
61.1
100.0%
Map Unit Descriptions
The map units delineated on the detailed soil maps in a soil survey represent the
soils or miscellaneous areas in the survey area. The map unit descriptions, along
with the maps, can be used to determine the composition and properties of a unit.
A map unit delineation on a soil map represents an area dominated by one or more
major kinds of soil or miscellaneous areas. A map unit is identified and named
according to the taxonomic classification of the dominant soils. Within a taxonomic
class there are precisely defined limits for the properties of the soils. On the
landscape, however, the soils are natural phenomena, and they have the
characteristic variability of all natural phenomena. Thus, the range of some
observed properties may extend beyond the limits defined for a taxonomic class.
Areas of soils of a single taxonomic class rarely, if ever, can be mapped without
including areas of other taxonomic classes. Consequently, every map unit is made
up of the soils or miscellaneous areas for which it is named and some minor
components that belong to taxonomic classes other than those of the major soils.
Most minor soils have properties similar to those of the dominant soil or soils in the
map unit, and thus they do not affect use and management. These are called
noncontrasting, or similar, components. They may or may not be mentioned in a
particular map unit description. Other minor components, however, have properties
and behavioral characteristics divergent enough to affect use or to require different
management. These are called contrasting, or dissimilar, components. They
generally are in small areas and could not be mapped separately because of the
scale used. Some small areas of strongly contrasting soils or miscellaneous areas
are identified by a special symbol on the maps. If included in the database for a
given area, the contrasting minor components are identified in the map unit
descriptions along with some characteristics of each. A few areas of minor
11

Custom Soil Resource Report
components may not have been observed, and consequently they are not
mentioned in the descriptions, especially where the pattern was so complex that it
was impractical to make enough observations to identify all the soils and
miscellaneous areas on the landscape.
The presence of minor components in a map unit in no way diminishes the
usefulness or accuracy of the data. The objective of mapping is not to delineate
pure taxonomic classes but rather to separate the landscape into landforms or
landform segments that have similar use and management requirements. The
delineation of such segments on the map provides sufficient information for the
development of resource plans. If intensive use of small areas is planned, however,
onsite investigation is needed to define and locate the soils and miscellaneous
areas.
An identifying symbol precedes the map unit name in the map unit descriptions.
Each description includes general facts about the unit and gives important soil
properties and qualities.
Soils that have profiles that are almost alike make up a soil series. Except for
differences in texture of the surface layer, all the soils of a series have major
horizons that are similar in composition, thickness, and arrangement.
Soils of one series can differ in texture of the surface layer, slope, stoniness,
salinity, degree of erosion, and other characteristics that affect their use. On the
basis of such differences, a soil series is divided into soil phases. Most of the areas
shown on the detailed soil maps are phases of soil series. The name of a soil phase
commonly indicates a feature that affects use or management. For example, Alpha
silt loam, 0 to 2 percent slopes, is a phase of the Alpha series.
Some map units are made up of two or more major soils or miscellaneous areas.
These map units are complexes, associations, or undifferentiated groups.
A complex consists of two or more soils or miscellaneous areas in such an intricate
pattern or in such small areas that they cannot be shown separately on the maps.
The pattern and proportion of the soils or miscellaneous areas are somewhat similar
in all areas. Alpha -Beta complex, 0 to 6 percent slopes, is an example.
An association is made up of two or more geographically associated soils or
miscellaneous areas that are shown as one unit on the maps. Because of present
or anticipated uses of the map units in the survey area, it was not considered
practical or necessary to map the soils or miscellaneous areas separately. The
pattern and relative proportion of the soils or miscellaneous areas are somewhat
similar. Alpha -Beta association, 0 to 2 percent slopes, is an example.
An undifferentiated group is made up of two or more soils or miscellaneous areas
that could be mapped individually but are mapped as one unit because similar
interpretations can be made for use and management. The pattern and proportion
of the soils or miscellaneous areas in a mapped area are not uniform. An area can
be made up of only one of the major soils or miscellaneous areas, or it can be made
up of all of them. Alpha and Beta soils, 0 to 2 percent slopes, is an example.
Some surveys include miscellaneous areas. Such areas have little or no soil
material and support little or no vegetation. Rock outcrop is an example.
12

Custom Soil Resource Report
Alamance County, North Carolina
CnB2—Cullen clay loam, 2 to 6 percent slopes, moderately eroded
Map Unit Setting
National map unit symbol. 2xn4j
Elevation: 330 to 980 feet
Mean annual precipitation: 39 to 47 inches
Mean annual air temperature: 55 to 63 degrees F
Frost -free period: 200 to 250 days
Farmland classification: All areas are prime farmland
Map Unit Composition
Cullen, moderately eroded, and similar soils: 95 percent
Minor components: 5 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Cullen, Moderately Eroded
Setting
Landform: Interfluves
Landform position (two-dimensional): Summit
Landform position (three-dimensional): Interfluve
Down -slope shape: Convex
Across -slope shape: Convex
Parent material: Mixed residuum weathered from igneous and metamorphic rock
Typical profile
Ap - 0 to 10 inches: clay loam
Bt - 10 to 50 inches: clay
BC - 50 to 69 inches: silty clay
CB - 69 to 80 inches: silty clay loam
Properties and qualities
Slope: 2 to 6 percent
Depth to restrictive feature: More than 80 inches
Natural drainage class: Well drained
Capacity of the most limiting layer to transmit water (Ksat): Moderately high to
high (0.57 to 1.98 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Available water storage in profile: Moderate (about 7.2 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 3e
Hydrologic Soil Group: B
Hydric soil rating: No
Minor Components
Enon, moderately eroded
Percent of map unit. 5 percent
Landform: Interfluves
Landform position (two-dimensional): Summit
13

Custom Soil Resource Report
Landform position (three-dimensional): Interfluve
Down -slope shape: Convex
Across -slope shape: Convex
Hydric soil rating: No
CnC2—Cullen clay loam, 6 to 10 percent slopes, moderately eroded
Map Unit Setting
National map unit symbol: 2xn4k
Elevation: 330 to 980 feet
Mean annual precipitation: 39 to 47 inches
Mean annual air temperature: 55 to 63 degrees F
Frost -free period: 200 to 250 days
Farmland classification: Farmland of statewide importance
Map Unit Composition
Cullen, moderately eroded, and similar soils: 95 percent
Minor components: 5 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Cullen, Moderately Eroded
Setting
Landform: Interfluves
Landform position (two-dimensional): Backslope, shoulder
Landform position (three-dimensional): Side slope
Down -slope shape: Concave
Across -slope shape: Linear
Parent material: Mixed residuum weathered from igneous and metamorphic rock
Typical profile
Ap - 0 to 10 inches: clay loam
Bt - 10 to 50 inches: clay
BC - 50 to 69 inches: silty clay
CB - 69 to 80 inches: silty clay loam
Properties and qualities
Slope: 6 to 10 percent
Depth to restrictive feature: More than 80 inches
Natural drainage class: Well drained
Capacity of the most limiting layer to transmit water (Ksat): Moderately high to
high (0.57 to 1.98 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Available water storage in profile: Moderate (about 7.2 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 3e
Hydrologic Soil Group: B
14

Custom Soil Resource Report
Hydric soil rating: No
Minor Components
Enon, moderately eroded
Percent of map unit. 5 percent
Landform: Interfluves
Landform position (two-dimensional): Backslope, shoulder
Landform position (three-dimensional): Side slope
Down -slope shape: Concave
Across -slope shape: Linear
Hydric soil rating: No
CnD2—Cullen clay loam, 10 to 15 percent slopes, moderately eroded
Map Unit Setting
National map unit symbol: 2xn4l
Elevation: 330 to 980 feet
Mean annual precipitation: 39 to 47 inches
Mean annual air temperature: 55 to 63 degrees F
Frost -free period: 200 to 250 days
Farmland classification: Farmland of statewide importance
Map Unit Composition
Cullen, moderately eroded, and similar soils: 95 percent
Minor components: 5 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Cullen, Moderately Eroded
Setting
Landform: Interfluves
Landform position (two-dimensional): Backslope
Landform position (three-dimensional): Side slope
Down -slope shape: Concave
Across -slope shape: Linear
Parent material: Mixed residuum weathered from igneous and metamorphic rock
Typical profile
Ap - 0 to 10 inches: clay loam
Bt - 10 to 50 inches: clay
BC - 50 to 69 inches: silty clay
CB - 69 to 80 inches: silty clay loam
Properties and qualities
Slope: 10 to 15 percent
Depth to restrictive feature: More than 80 inches
Natural drainage class: Well drained
Capacity of the most limiting layer to transmit water (Ksat): Moderately high to
high (0.57 to 1.98 in/hr)
Depth to water table: More than 80 inches
15

Custom Soil Resource Report
Frequency of flooding: None
Frequency of ponding: None
Available water storage in profile: Moderate (about 7.2 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 4e
Hydrologic Soil Group: B
Hydric soil rating: No
Minor Components
Enon, moderately eroded
Percent of map unit. 5 percent
Landform: Interfluves
Landform position (two-dimensional): Backslope
Landform position (three-dimensional): Side slope
Down -slope shape: Concave
Across -slope shape: Linear
Hydric soil rating: No
CnE2—Cullen clay loam, 15 to 45 percent slopes, moderately eroded
Map Unit Setting
National map unit symbol: 2xn4m
Elevation: 330 to 980 feet
Mean annual precipitation: 39 to 47 inches
Mean annual air temperature: 55 to 63 degrees F
Frost -free period: 200 to 250 days
Farmland classification: Not prime farmland
Map Unit Composition
Cullen, moderately eroded, and similar soils: 95 percent
Minor components: 5 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Cullen, Moderately Eroded
Setting
Landform: Interfluves
Landform position (two-dimensional): Backslope
Landform position (three-dimensional): Side slope
Down -slope shape: Concave
Across -slope shape: Linear
Parent material: Mixed residuum weathered from igneous and metamorphic rock
Typical profile
Ap - 0 to 10 inches: clay loam
Bt - 10 to 50 inches: clay
BC - 50 to 69 inches: silty clay
CB - 69 to 80 inches: silty clay loam
it.

Custom Soil Resource Report
Properties and qualities
Slope: 15 to 45 percent
Depth to restrictive feature: More than 80 inches
Natural drainage class: Well drained
Capacity of the most limiting layer to transmit water (Ksat): Moderately high to
high (0.57 to 1.98 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Available water storage in profile: Moderate (about 7.2 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 6e
Hydrologic Soil Group: B
Hydric soil rating: No
Minor Components
Enon, moderately eroded
Percent of map unit. 5 percent
Landform: Interfluves
Landform position (two-dimensional): Backslope
Landform position (three-dimensional): Side slope
Down -slope shape: Concave
Across -slope shape: Linear
Hydric soil rating: No
RvA—Riverview loam, 0 to 2 percent slopes, occasionally flooded
Map Unit Setting
National map unit symbol: 2xn63
Elevation: 330 to 660 feet
Mean annual precipitation: 39 to 47 inches
Mean annual air temperature: 55 to 63 degrees F
Frost -free period: 200 to 250 days
Farmland classification: All areas are prime farmland
Map Unit Composition
Riverview, occasionally flooded, and similar soils: 90 percent
Minor components: 10 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Riverview, Occasionally Flooded
Setting
Landform: Flood plains
Landform position (two-dimensional): Toeslope
Landform position (three-dimensional): Tread
Down -slope shape: Linear
17

Custom Soil Resource Report
Across -slope shape: Linear
Parent material: Loamy alluvium derived from igneous and metamorphic rock
Typical profile
A - 0 to 8 inches: loam
Bw - 8 to 48 inches: loam
C - 48 to 80 inches: sandy loam
Properties and qualities
Slope: 0 to 2 percent
Depth to restrictive feature: More than 80 inches
Natural drainage class: Well drained
Capacity of the most limiting layer to transmit water (Ksat): Moderately high to
high (0.57 to 1.98 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: Occasional
Frequency of ponding: None
Available water storage in profile: Very high (about 12.0 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 2w
Hydrologic Soil Group: B
Hydric soil rating: No
Minor Components
Buncombe, frequently flooded
Percent of map unit. 5 percent
Landform: Flood plains
Landform position (two-dimensional): Toeslope
Landform position (three-dimensional): Tread
Down -slope shape: Linear
Across -slope shape: Linear
Hydric soil rating: No
Chewacla, frequently flooded
Percent of map unit. 5 percent
Landform: Flood plains
Landform position (two-dimensional): Toeslope
Landform position (three-dimensional): Tread
Down -slope shape: Linear
Across -slope shape: Linear
Hydric soil rating: No
W—Water
Map Unit Composition
Water.- 100 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
18

Custom Soil Resource Report
Description of Water
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 8w
Hydric soil rating: No
19

References
American Association of State Highway and Transportation Officials (AASHTO).
2004. Standard specifications for transportation materials and methods of sampling
and testing. 24th edition.
American Society for Testing and Materials (ASTM). 2005. Standard classification of
soils for engineering purposes. ASTM Standard D2487-00.
Cowardin, L.M., V. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of
wetlands and deep -water habitats of the United States. U.S. Fish and Wildlife
Service FWS/OBS-79/31.
Federal Register. July 13, 1994. Changes in hydric soils of the United States.
Federal Register. September 18, 2002. Hydric soils of the United States.
Hurt, G.W., and L.M. Vasilas, editors. Version 6.0, 2006. Field indicators of hydric
soils in the United States.
National Research Council. 1995. Wetlands: Characteristics and boundaries.
Soil Survey Division Staff. 1993. Soil survey manual. Soil Conservation Service.
U.S. Department of Agriculture Handbook 18. http://www.nres.usda.gov/wps/portal/
n res/d eta i I/n ati o n a I/s o i Is/?cid = n res 142 p2_0 54262
Soil Survey Staff. 1999. Soil taxonomy: A basic system of soil classification for
making and interpreting soil surveys. 2nd edition. Natural Resources Conservation
Service, U.S. Department of Agriculture Handbook 436. http://
www. nres. usda.gov/wps/portal/nres/detail/national/soils/?cid=nres142p2_053577
Soil Survey Staff. 2010. Keys to soil taxonomy. 11th edition. U.S. Department of
Agriculture, Natural Resources Conservation Service. http://
www. nres. usda.gov/wps/portal/nres/detail/national/soils/?cid=nres142p2_053580
Tiner, R.W., Jr. 1985. Wetlands of Delaware. U.S. Fish and Wildlife Service and
Delaware Department of Natural Resources and Environmental Control, Wetlands
Section.
United States Army Corps of Engineers, Environmental Laboratory. 1987. Corps of
Engineers wetlands delineation manual. Waterways Experiment Station Technical
Report Y-87-1.
United States Department of Agriculture, Natural Resources Conservation Service.
National forestry manual. http://www.nres.usda.gov/wps/portal/nres/detail/soils/
home/?cid=nres142p2_053374
United States Department of Agriculture, Natural Resources Conservation Service.
National range and pasture handbook. http://www.nres.usda.gov/wps/portal/nres/
detail/national/landuse/rangepastu re/?cid=stelprdb1043084
20

Custom Soil Resource Report
United States Department of Agriculture, Natural Resources Conservation Service.
National soil survey handbook, title 430-VI. http://www.nres.usda.gov/wps/portal/
n res/d eta i I/so i Is/scie ntists/?cid=n res 142 p2_054242
United States Department of Agriculture, Natural Resources Conservation Service.
2006. Land resource regions and major land resource areas of the United States,
the Caribbean, and the Pacific Basin. U.S. Department of Agriculture Handbook
296. http://www.nres.usda.gov/wps/portal/nres/detail/national/soils/?
cid = n res 142 p2_05 3624
United States Department of Agriculture, Soil Conservation Service. 1961. Land
capability classification. U.S. Department of Agriculture Handbook 210. http:H
www.nrcs.usda.gov/lnternet/FSE—DOCUMENTS/nrcsl 42p2_052290. pdf
21

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[' 011117WIllydell
Precipitation Frequency Data Server
NOAA Atlas 14, Volume 2, Version 3 GRAHAM 2
ENE
Station ID: 31-3555
Location name: Graham, North Carolina, USA*
£ `°E,
ffi Latitude: 36.0503°, Longitude:-79.37280
E
w Elevation:
Elevation (station metadata): 660 ft**
e ESRI Maps
sou rce USGS
POINT PRECIPITATION FREQUENCY ESTIMATES
G.M. Bonnin, D. Martin, B. Lin, T. P-ybok, M. Y.IQ and D. Riley
N OM National Weather Service, Silver Sprang, Maryland
PF tabular I PF graphical I Maps & aerials
PF tabular
PDS-based point precipitation frequency estimates with 90 % confidence intervals (in inches)1
Duration
Average
recurrence interval (years)
1
2
5
10
25
50
100
200
500
��
1000
5-min
0.358-0 430
0.426-0 511
0.494 0 593
0.538-0.646
0.583-0 702
0.6110-0.738
0.633-0 768
0.648-0 792
0.659-0 813
0.664- 825
10-min
0.577 -0686
0.682-0817
0.791-0949
0. 611-1.03
0.929-1.12
0.97 -11.18
1.0111.22
1.0311.25
1.0411829
1.0511930
77
15-min
0.7D15- 858
0.8593703
1.0011020
1.094931
1.18 042
1.233 A9
1.274154
1.304.58
1.314862
1.314963
24
30-min
0.980 11.18
1.18-21942
1.42-1671
1.58 1389
1.759310
1. 5-.24
1. 5 2636
2.02 2.47
2.09 2.58
2.12 2164
1.34
1.62
2.00 77
2.25
F 2.56
2.78
2.98
7T6
3.38
3.52
60-min
(1.22-1.47)
1 (1.49-1.78)
1 (1.82-2.19) 11
(2.06-2.46)
1 (2.32-2.80)
1 (2.51-3.04) 11
(2.68-3.26)
1 (2.83.46)
1 (3.006.69)
(3.10-3.85)
1.58
1.91
2.37
2.70
3.12
3.42
3.71
3.99
4.34
4.59
2-hr
(1.45-1.72)
1 (1.752.09)
1 (2.17-2.59) 11
(2.47-2.94)
1 (2.83.39)
1 (3.09-3.72) 11
(3.334.04)
1 (3.554.34)
(3.824.71)
(4.00-5.00)
1.69
2.05
2.54
2.90
3.36
3.69
4.02
4.34
4.73
5.02
3-hr
(1.55-1.84)
1 (1.89-2.23)
(2.34-2.76) 11
(2.66-3.15)
1 (3.06-3.63)
(3.353.99) 11
(3.614.34)
1 (3.874.68)
(4.175.11) 11
(4.39-5.43)
2.05 77
2.47
3.07 77
3.52
74.11
4.57 77
5.02
5.47 7
6.07 77T52
6-hr
(1.90-2.23)
1 (2.29-2.69)
(2.84-3.34) 11
(3.24-3.82)
1 (3.754.44)
(4.144.93) 11
(4.515.42)
1 (4.875.90)
(5.325.55) 11
(5.64-7.05)
2.44
2.95
3.67
4.24
5.01
5.62
6.26
6.91
7.80
8.50
12-hr
(2.25-2.66)
1 (2.726.21)
1 (3.384.00)
(3.894.61)
1 (4.565.43)
1 (5.08-6.07) 11
(5.596.73)
(6.10-7.42)
(6.75A.38) 11
(7.24-9.13)
2.87 7F3.46
743
4.7
F5.86
7T56
7.26
7.99
8.98
9.75
24-hr
(2.68-3.08)
1 (3.236.71)
1 (4.024.62)
(4.635.32)
1 (5.436.28)
1 (6.067.04)
(6.70-7.82)
(7.34A.62)
(8.219.71)
(8.87-10.6)
3.34
4.02
7 4.96
7T6.
6.637
7.37
8.11
8.87
9.89
10.7
2-day
(3.13.58)
(3.774.31)
1 (4.655.32) 11
(5.316.09)
1 (6.17-7.12)
(6.84-7.93)
(7.58.74)
(8.16.59)
(9.0510.7)
(9.73-11.6)
3.53
4.24
75.22
5.97
6.98
7.76 778.55
779.36
10.5 711.3
3-day
(3.316.78)
(3.984.54)
1 (4.89-5.59) 11
(5.56.39)
1 (6.50-7.48)
(7.20-8.33) 11
(7.919.21)
1 (8.62-10.1)
(9.57-11.3)
(10.3-12.3)
3.72
4.46
5.48
6.27
7.32
8.15
8.99
9.85
11.0
11.9
4-day
(3.496.98)
1 (4.184.77)
1 (5.135.85) 11
(5.86.70)
1 (6.82-7.84)
1 (7.56-8.74) 11
(8.319.67)
1 (9.07-10.6)
1 (10.1-11.9)
(10.9-13.0)
7-day
(4.034.54)
4. 90 .41
5. 0 6.56
6. 9-D7046
7.6418.69
8. 6 9.6
9. 2 --110.7
1 10111.
11 2-13.1
1210-14.2
4
6
27
10-day
4.575414
5. 3�6.11
6. 0-67933
7.34 8829
8.459959
9. 0- 0.6
10. -111.7
1110-12.
1212-14.2
131� 15.44
20-day
6.161 6.83
7.21 8105
8. 0 9951
9.5 -10.7
10.9-12.3
1210-13.6
131414.9
1411-16.3
1516-18.1
1617--19.6
30-day
7.61 8043
8.949190
10.4-111.5
115-12.7
129314.4
1410-15.6
1511616.9
1611718.2
1715- 0.0
1 6- 1.3
45-day
9.67---10.6
11 3112.4
1219-14.2
142-15.7
158617.5
1711819.0
18.3- 0.4
1950 1.9
21 0� 3.8
2223 5.3
12.2
14.2
16.0
17.4
19.2
20.5
21.8
23.0
24.6
25.8
60-day
(11.7-12.7)
(13.14.9)
(15.316.7)
(16.6-18.2)
(18.3-20.1)
(19.521.5)
(20.7-22.9)
(21.8-24.2)
(23.326.0)
(24.327.3)
frequency (PF) estimates in this table are based on frequency analysis of partial duration series (PDS).
arenthesis are PF estimates at lower and upper bounds of the 90% confidence interval. The probability that precipitation frequency estimates (for a
n and average recurrence interval) will be greater than the upper bound (or less than the lower bound) is 5%. Estimates at upper bounds are not
=amaximum
nst probable maximum precipitation (PMP) estimates and may be higher than currently valid PMP values.
o NOAA Atlas 14 document for more information.
BacK to lop
PF graphical
https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?st=nc&sta=31-3555&data=depth&units=english&series=pds 1 /3

[:ilIN7WIN1111
Precipitation Frequency Data Server
30
2
t 2i
m
0
0 1'
Average recurrence interval (years)
NCAA Atlas 14, Volume 2, Version 3 Created (GMT). Wed Jun 1014.51.07 2020
Back to Top
Maps & aerials
Large scale terrain
_
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Greensboro
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NORTH CAROLINA
�'
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11�00km Fayetteville.
60mi
Jad
Large scale map
Average recunance
imerval
{years)
— 1
2
— 6
— 10
25
60
100
200
Sao
1000
Duration
— 5inan —
2-day
— i"in —
3-day
15-man —
"ay
— 30-min —
7-day
— 45"in —
10-day
— 2-1r —
20-day
— 3-Mr —
30-day
— 6fir —
4s-day
— 12-hr —
00-day
— 24-hr
https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?st=nc&sta=31-3555&data=depth&units=english&series=pds 2/3

I::ifN7fkiilYkill
Precipitation Frequency Data Server
EI Eck•: hurj P. c'n'`
••"••• Rocky Nou
G.
Carolina
' Jiff/ Raleigh
North �U
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100km ti ette ille
60mi .� Jack
Back to Top
US Department of Commerce
National Oceanic and Atmospheric Administration
National Weather Service
National Water Center
1325 East West Highway
Silver Spring, MD 20910
Questions?: [e-mail]
Disclaimer
https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?st=nc&sta=31-3555&data=depth&units=english&series=pds 3/3

[' 011117WIllydell
Precipitation Frequency Data Server
NOAA Atlas 14, Volume 2, Version 3
Location name: Graham, North Carolina, USA*r.,.,.,
�
Elevatio
Latitude: 36evatio, Longitude:-79.36730 a WL n: 542.53 ft**
e EESRI MapsS sour USG9�."`""
POINT PRECIPITATION FREQUENCY ESTIMATES
G.M. Bonnin, D. Martin, B. Lin, T. P-ybok, M. Y.lQ and D. Riley
N OM National Weather Service, Silver Sprang, Maryland
PF tabular I PF graphical I Maps & aerials
PF tabular
PDS-based point precipitation frequency estimates with 90 % confidence intervals (in inches/hour)1
Average
recurrence interval (years)
Duration
1
2
5
10
25
50
100
200
500
1000
5-min
G 325418
5.156316
5. 6--r�7.15
6. 0 7379
7. 6 8850
7. 918.93
7.68 9?31
7.87 9861
8.03 9489
8. 0110.1
3.79
4.50
5.23
5.70
6.20
6.51
6.77
6.97
7.15
7.24
10-min
(3.464.14)
1 (4.124.93)
(4.78-5.72)
(5.206.23)
1 (5.626.77)
(5.89-7.11) 11
(6.10-7.40)
(6.24-7.62)
(6.357.82)
(6.38-7.92)
3.16 77
3.77
4.41
4.
7524
5.50 77
5.70
5.86 7F
6.00 77
6.06
15-min
(2.886.45)
1 (3.454.13)
(4.034.83)
(4.395.26)
1 (4.755.72)
(4.97-6.00) 11
(5.146.24)
(5.256.41)
(5.336.56) 11
(5.34-6.62)
2.16
2.60
3.14
3.48 7F3.88
4.14 774.37
4.56 7
4777
4.90
30-min
(1.97-2.37)
(2.38-2.85)
(2.86-3.43)
(3.186.81)
1 (3.524.23)
(3.744.52) 11
(3.944.77)
(4.094.99)
(4.245.22) 11
(4.32-5.36)
1.35
1.63
2.01
2.27
2.58
2.80
3.01
3.20
3.42
3.58
60-min
(1.23-1.48)
(1.49-1.79)
(1.83-2.20) 11
(2.07-2.48)
1 (2.34-2.82)
(2.54-3.06) 11
(2.71-3.29)
(2.87-3.50)
(3.04-3.75) 11
(3.15-3.92)
0.795 77
0
2.771.36
1.57
1.73
1.88
2.27
2.20 77
2.33
2-hr
(0.728-0.869)
(0.883-1.05)
1 (1.09-1.31) 11
(1.24-1.49)
1 (1.42-1.71)
1 (1.56-1.88) 11
(1.68-2.04)
(1.80-2.20)
(1.94-2.39) 11
(2.03-2.54)
0.566
0.686
D.5277..74
1.13
1.24 771.36
477
61
1.71
3-hr
(0.520-0.616)
(0.632-0.748)
(0.782-0.928)
(0.892-1.06)
1 (1.03-1.22)
1 (1.13-1.35) 11
(1.22-1.47)
1 (1.31-1.59)
1 (1.41-1.74) 11
(1.49-1.85)
0.344
0.416
7..516
0.592
0.693
0.770
0.848
0.925 7
03
1.11
6-hr
(0.318-0.375)
(0.385-0.453)
(0.476-0.562)
(0.544-0.643)
(0.631-0.749)
(0.697-0.833)
(0.761-0.916)
(0.822-0.999)
(0.900-1.11)
(0.957-1.20)
0.2.
0.246
0.307
0.354
0.419
0.471
0.524
0.579
0.655
0.714
12-hr
(0.188-0.222)
(0.227-0.268)
(0.282-0.334)
(0.325-0.386)
(0.381-0.454)
(0.4250.508)
(0.468-0.564)
(0.511-0.623)
(0.567-0.705)
(0.608-0.769)
0.120
F..145
0.180
0.208
0.245
0.274
7..304
0.335
0.376
0.408
24-hr
(0.112-0.128)
(0.135-0.155)
(0.168-0.193)
(0.194-0.222)
(0.227-0.263)
(0.254-0.294)
(0.280-0.327)
(0.308-0.360)
(0.344-0.406)
(0.372-0.442)
2-day
0066-0 075
0.079-0 090
0097 0.111
0.1D11-0..1127
0.129-0..1149
0.143-0.166
0.157-0..1183
0.1771-0201
0.190-0 225
0.204-0 243
3-day
0046-0053
0.05 -0063
0068-0078
00778-0089
0091-0104
0.10110.1116
0.1110-0..1129
0.120-0141
0.134-0.158
0.144-0..1172
F1 d 7Y4-day
0 37-0.042
0.04 0050
0054-0061
0061-0070
00771-0082
00779-0092
0087---0.101
0095-0.111
0.106-0.125
0.1114-0.136
7-day
0024-0 02
0.029-0 032
003 -0 039
0039-0.045
0046-0 052
0051-0 058
005 -0 064
0060-0 070
0. 67--0 078
0077 -0 085
10-day
00D19-0 022
0.02 -0 026
0027--0 031
0031-0 035
003 -0 040
003 0 044
004 -0.049
0046-0 053
0.051-0 060
005 -0 064
0.014
0.016
0.019
0.021
0.024
0.027
0.029
0.032 7
0.035
0.038
20-day
(0.013-0.014)
(0.015-0.017)
(0.018-0.020
(0.020-0.022)
(0.023-0.026)
(0.0250.028)
(0.027-0.031)
(0.030-0.034)
(0.033-0.038)
(0.0350.041)
0.011
0.013
0.015
0.017
0.019
0.021
0.022
0.024
0.026
0.028
30-day
(0.011-0.012)
(0.012-0.014)
(0.014-0.016)
(0.016-0.018)
(0.018-0.020)
(0.020-0.022)
(0.021-0.024)
(0.023-0.025)
(0.024-0.028)
(0.026-0.030)
0.009
0.011
0.013
0.014
0.016
0.017
0.018
0.019
0.021
0.022
45-day
(0.009-0.010)
(0.011-0.012)
(0.012-0.013)
(0.013-0.015)
(0.015-0.016)
(0.016-0.018)
(0.017-0.019)
(0.018-0.020)
(0.020-0.022)
(0.021-0.024)
0.009
0.010
0.011
0.012
0.013
0.014
0.015
0.016
0.017
0.018
60-day
(0.008-0.009)
(0.009-0.010)
(0.011 -0.012)
(0.012-0.013)
(0.013-0.014)
(0.0140.015)
(0.014-0.016)
(0.015-06(0.01..019)
Precipitation frequency (PF) estimates in this table are based on frequency analysis of partial duration series (PDS).
Numbers in parenthesis are PF estimates at lower and upper bounds of the 90h confidence interval. The probability that precipitation frequency estimates (for a
given duration and average recurrence interval) will be greater than the upper bound (or less than the lower bound) is Sh. Estimates at upper bounds are not
checked against probable maximum precipitation (PMP) estimates and may be higher than currently valid PMP values.
Please refer to NOAA Atlas 14 document for more information.
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PF graphical
https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=36.0122&Ion=-79.3673&data=intensity&units=english&series=pds 1 /3

[:ilIN7WIN1111
Precipitation Frequency Data Server
PDS-based intensity -duration -frequency (IDF) curves
Latitude: 36.0122'. Longitude:-79.3673`
10.000
Average recunance
-
imerval
1.000
— 1
-
2
0.100
G
— 25
60
0.010
eon
a
— Sao
— 1000
0.c01
o Q rho n o r4i m v�
Duration
Average recurrence interval (years)
NCAA Atlas 14, Volume 2, Version 3 Created (GMT). Wed Jun 1D 14.51.48 2D20
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Maps & aerials
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1
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NORTH CAROLINA
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Large scale map
Duration
— 5intn —
2-day
— i"in —
3-day
15-mtn —
"ay
— 30-min —
7-day
— 45"in —
10-clay
— 231r —
20-0ay
— 3-In —
3D-d V
— 6fir —
4s-day
— 12-hr —
00day
— 24-hr
https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=36.0122&Ion=-79.3673&data=intensity&units=english&series=pds 2/3

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Precipitation Frequency Data Server
B lacksbury .. n�nc
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Raleigh
North G.
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US Department of Commerce
National Oceanic and Atmospheric Administration
National Weather Service
National Water Center
1325 East West Highway
Silver Spring, MD 20910
Questions?: [e-mail]
Disclaimer
https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=36.0122&Ion=-79.3673&data=intensity&units=english&series=pds 3/3

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0
]�' r- r i, - 1
Parcel Boundary
Site Boundary Fe t r.
HEADWATER ENVIRONMENTAL, INC. Source: FIGURE 1
512 Sweetbay Court USGS LOCATION MAP
Wilmington, North Carolina 7.5-minute Topographic Quadrangle
Mebane (1982), Burlington (1981) Snow Southwick Solar Farm, LLC
Camp (1978), & Saxaphaw (1977) White Site
Date: 11/7/2016 3058 Boywood Road
Contour Interval = 10 Feet Swepsonville, Alamance County, NC
�N HEnv Project #201625
Prepared by: DFH 4 0 Scale 1 "= 1,600'

.
4W
ti
LEGEND
t16002
r� 5
16� �•
•r
h �
L F
*$ • MbbB
A
KLA
Parcel Boundary
- Site Boundary N
HEADWATER ENVIRONMENTAL, INC.
512 Sweetbay Court
Wilmington, North Carolina
Date:
11 /12/2016
40 ..
`P�
- 1 GwiE
sz
L2
L I'll 0
'• "" �-��y �yi•�FV J
• 1%
V,
r
G��
0 400
Source:
USGS
Natural Resources Conservation
Service, Archived Soil Survey
dated 1960
4 OoAeN Scale 1 "= 600'
h
:80
1,600 Feet
FIGURE 2
ARCHIVED SOIL SURVEY
Southwick Solar Farm, LLC
White Site
3058 Boywood Road
Swepsonville, Alamance County, NC
HEnv Project #201625
Prepared by:
DFH

1701
' DbB
S4 W •� a
42
aD3
MbB2
LbC2,
bB
GaC2 LbD2
r12
LEGEND
- - - - Parcel Boundary
Site Boundary
GaE '
1I7lya
4 Zf+%
GbE3
GcE Goldston channery silt loam, 15 to 25 percent slopes
LbC2 Lloyd loam, 6 to 10 percent slopes, eroded
LbD2 Lloyd loam, 10 to 15 percent slopes, eroded
MbB2 Mecklenburg loam, 2 to 6 percent slopes, eroded
Mc Mixed alluvial land, poorly drained
WbE Wilkes soils, 15 to 25 percent slopes
HEADWATER ENVIRONMENTAL, INC.
512 Sweetbay Court
Wilmington, North Carolina
Date: 11 /14/2016
Prepared by: DFH
LbD2
•`� � M
WbE
k!
LbD2
GcE
GaC2
0 100 200 400 600 800 Feet
Source: FIGURE 3
SOIL MAP
Natural Resources Conservation Southwick Solar Farm, LLC
Service, Web Soil Survey White Site
Accessed November 2016 3058 Boywood Road Swepsonville,
Alamance County, NC
QrA No Scale 1 "= 300' HEnv Project #201625

0
0
\ 0
LEGEND
- - - - Parcel Boundary
Site Boundary
ZONE AE
I
I
I
I
f —v
Alamace County
Unincorporated Areas
370001
0 200 400 800 1,200 Feet
HEADWATER ENVIRONMENTAL, INC.
512 Sweetbay Court
Wilmington, North Carolina
Date:
11 /14/2016
Source:
FEMA
Online Flood Map Service Center
Map # 3710888900J
September 6, 2006
4 OoAeN Scale 1 "= 500'
LEGEND
WELTAL FLOM HAZARD AREAS (SFHAS] RADET Ti:
,INUNDAT]4N BY THE t% ANNUAL CJ-MCE F10)D
T" L% annul *adds Mop [ IOagaPr ^fib alive roam as me Wi nma N r" Mad Nar
hee a 1% dnnce of berg mpW & bmcded In am uram yea. The Specr Flod rl .d
Artta k [Tn area sebl.{t mpplrq W m. 1% anrvul Qwwv brKA. Aronr n91 r 1 Rixia
Mll I -A.de 21i 1 AE, AHi AQ AP, NM V. Orva WE. The 0— F600 Etna o tle
..aenrarTxe elawNm Mpg 1%an.W siunm MH
2011! A He Sex kad LLvallm d3 —d.
2011E AE Eabe F" 9Wva"E A?te rVnaa
ton! AN ak d deptle M 1 b] 9 feet [usudlF ones d posdml}: hex PboJ Ek dam
awwp rom
241E AO Fl od aedfis 9r 1 t. 16W (...IV ahwt hxv m sbrYsg hrrraln5; y.p-a�
dWb dKennnBd. F9r ueets Of NW01 fdn %Wft. veloClb d&I
nemervraa.
2 1 An �1-1 Fl" IN rd Pam fonT Pl P� from the 1% an M 6
aepp rw a ftm SenW S,' M 0T nay 5.�0'aPOimrlr dP[CrGF.k. � AN
indreta diet me b fleoi oonhvl syseT is berg mAarN b pan]e
rxrx[ar "nn We L% anrnal rnRdeaegle. RJ—
20ME ASK Nnu to be ArobnCaa Ieam 1% anr wa anon A a F{ u I A
4'ro V.SfS a.der sCaemattcn; ip Baee f]A.ed Nprdp alEllrthkr.•d.
WNE YE Co Stal MW auk WM h9AUrr bal d ;� ad m): Base Food EIE' K6 s
a
FLO06'A'ODWAAY AREAS IN ZONE AE
1ne ft wy a eh. ar M d a m.am eW a, *� A -lrn ass mn max x wene
Eppd9 6ble5M! 0" Rk 1% anr'A zha Mod[an Ge ohm-ntl tANRaxal
.—in Aomr.Vp
OTHER FLOOD AREAS
zone: p,ess d 0.2%-1 dunce fm ; dam r L% emrd deans Bon rwn
arerdgp 40WN Qr IM than I fad v ..kb Pana9! areas less tlau t swan
mlt ad arms proteeRi bf krt film 1K annul dune 6
OTHER AREA$
2GN1% Are:rlrtnn..a mbe omd.tt. ozSn anr.w aurae nomWb.
z E D &. . rah %W hbrrd'a+. ,..eler,ewae. W eacwah
® COASM BARRIER RE90UR10E5 S1 STEM TOMS) AREAS
OTHERWISE PRUFB TED ARE05 (ORAs)
,OnSa Sand OPAS are la kla[M Metr:n a ad)e to WAA MF"HaW Ab
M amstl s*s.x rm"n briroe�!'
Alb marl rr.,u.._..Nan rn.rde�r
lawt.ry bv'naery
..................... �9F:a aM CPn per
ewme�a.a.y sP� rax wpm a.ea � ere be.w�
�� a,ubp �aa Enaa da�ra Aaus rr a.wa .__ Ibotl
ee.el4.e. � *euo o, ram •��
-� 519 ---�-- aaou Nnrra� �..e ra dFr, se•aa� .. #er
MLA Flom Ewm. wa ssTwn uefsaxxne.wa: nwnai in
Ref'
• BNemotl m1k H Ci Jm`[si wn�l bap�x. �f 1968
�1 Q5¢ra[6pn1a
as ® mraen lre
FIGURE 4
FEMA MAP
Southwick Solar Farm, LLC
White Site
3058 Boywood Road
Swepsonville, Adamance County, NC
HEnv Project #201625
Prepared by:
DFH

This is not a survey. All locations depicted on this figure are approximate. This Wetland Determination was conducted by Headwater
Environmental, Inc. (HEnv) in November of 2016. There are no wetlands or streams within the site boundary. This determination
was verified by Mr. David Bailey with the U.S. Army Corps of Engineers on January 20, 2016 (SAW-2017-00074).
4 e ,.' ,y..0
The site drains to the Haw River. The
Haw River is located within the Jordan
Lake watershed. A 50-foot vegetated
buffer is required along applicable
streams in this watershed. There are no
applicable streams within within 50 feet
of the site boundaries.
♦1y.
"r y� � ;•�t .I.' � Sri^����1•.
LEGEND
- - - - Parcel Boundary
Site Boundary
Perennial Stream
- - - - Intermittent Stream
Potential Wetland
® Non -jurisdictional man made pond
HEADWATER ENVIRONMENTAL, INC.
512 Sweetbay Court
Wilmington, North Carolina
Date: 1 11/15/2016
WIN
ox
Y`
0 180 360 720 1,080 1,440 Feet
Source:
ESRI
World Base Map Imagery (2015)
Stepsonville, NC
FIGURE 5
WETLAND DETERMINATION
Southwick Solar Farm, LLC
White Site
3058 Boywood Road
Swepsonville, Adamance County, NC
HEnv Project #201625
Prepared by: I DFH
Scale 1 "= 300'