SWA000108_Stormwater Report_20210621

CHATHAM COUNTY HOSPITAL
CELL TOWER SITE
Chatham County, North Carolina
STORMWATER MANAGEMENT REPORT
Prepared By:
KCI Associates of NC
ENGINEERS, PLANNERS, SURVEYORS AND LANDSCAPE ARCHITECTS
4505 Falls of Neuse Road, Suite 400
Raleigh, NC 27609
(919)-278-2551
Contact: Brian Kraynak
L
- a6 - ';Ju';�
Project #011904897
KCI
ASSOCIATES OF NC
Dated: August 2020

Table of Contents
AerialMap............................................................................................ 3
GISContour Map................................................................................. 4
Project Description............................................................................... 5
Existing Conditions.............................................................................. 5
Proposed Development........................................................5
Calculations Methodology................................................................... 6
Calculations
A. Pre Developed Calculation
B. Post Developed Calculations
Soils Report

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PROJECT DESCRIPTION
The following is the Site development Stormwater Management Plan for an undeveloped parcel located on
the west side of Progress Boulevard across from the Chatham County Hospital. The site is 35 acres and
bounded by US 421 on the west. This submittal is for a new cell tower compound and its associated gravel
access drive. The cell tower will be used by the County as part of its emergency communication network.
EXISTING CONDITIONS
The site is undeveloped and today is entirely wooded. There are two larger drainage valleys one smaller
drainage valley that generally flow from south to north across the parcel. There are also ridge high points that
are breaks between the drainage valleys. There is no existing impervious on the parcel.
The approximate area of the parcel is 35 acres. The soil types located on site include: Georgeville silt loam, 2-
6 percent slopes and 6 — 10 slopes; Georgeville silty clay loam, 2 to 6 percent slope; Georgeville-Badin
complex 10 — 15 percent slopes; Goldston-Badin complex, 2 — 15 percent slopes; and Nanford-Badin
complex, 2 — 6 percent slopes and 6 to 10 percent slopes. Georgeville silt loam, Georgeville silty clay loam,
Georgeville-Badin complex are in the hydrologic soils group B, while the Badin and Nanford are in soil group
C and the Goldston is in group D soils classification.
The site drains to the property to the north. From there it crosses under Progress Boulevard and then makes its
way to the Rocky River.
PROPOSED DEVELOPMENT
The proposed development includes a new 60 foot square cell tower compound enclosed by a fence at the
western part of the site. A 15 foot wide access drive near the southern property line provides access to the
tower from Progress Boulevard. The road length is approximately 2,000 feet. The access drive and cell tower
compound will be gravel. No other impervious will be added for this project. The total amount of gravel
resulting from this project is 0.80 acres.
The site grading is minimal only affecting the immediate area around the flat cell tower compound. The
access drive grading follows the existing topography and is mostly cut into the existing ground but in some
areas till is required to reduce the slope of the access drive in order to make it more drivable. A culvert pipe
will be installed at the drive location on Progress Boulevard and 3 other culvert pipe crossings will be used at
the low spots along the drive to maintain the existing drainage patterns. Two retaining walls will be
constructed along the access drive to prevent grading over the property line at 3:1 slopes.
There are no wetlands, buffers, critical areas, or any other environmental features within the project area. The
proposed project does not impact or alter the existing drainage patterns of the site.

CALCULATION METHODOLOGY
Pre -developed and post developed runoff rates where compared in accordance with Chatham County
stormwater regulations. The calculations were performed using TR-55 with Chatham County rainfall
amounts. According to the soils information about half of the site is a soil B classification and half a soil C
classification. An average of the curve numbers was used for Woods — Fair ground cover type for both
conditions. The average of the curve numbers for both soil types was also used for gravel in the post
developed condition.
The time of concentration or the time of the runoff flow path across the site was not changed between the pre -
developed and post developed condition because of the minimal impact of the access drive and cell tower
compound area. The same drainage patterns will exist after development.
The relatively small amount of impervious gravel area added (0.80 acres) as result of this project did not
increase the overall curve number for the post developed condition and thus did not increase the post
developed runoff amount for the storms analyzed. A summary table of the runoff rates for different storm
intervals is provided below. Supporting calculations are also included along with the soils map.
PRE
STORM
DEV
POST
CHANGE
(years)
(Cfs)
(Cfs)
N
1
14.7
14.7
0
2
23.81
23.81
0
10
51.8
51.8
0
25
69.93
69.93
0
50
84.97
84.97
0
100
100.75
100.75
0

CALCULATIONS

EXISTING CONDITIONS
SOIL B
SOIL C
AVERAGE CN
AREA
WOODS- FAIR 65
76
70.5
35
USE CN OF 71 FOR PRE DEV
PROPOSED CONDITIONS
SOIL B
SOIL C
AVERAGE CN
AREA
WOODS - FAIR 65
76
70.5
34.2
GRAVEL ROAD 85
89
87
0.8
ASSUMED TC OF 45 MINUNTES FOR PRE AND POST DEVELOPED
STORM PRE DEV POST
CHANGE
(years) Ids) (cfs)
N
1 14.7 14.7
0
2 23.81 23.81
0
10 51.8 51.8
0
25 69.93 69.93
0
50 84.97 84.97
0
100 100.75 100.75
0

CHATHAM COUNTY STORMWATER ORDINANCE
AMENDED AUGUST 15, 2016
NOVEMBER 24, 2008
APPENDIX A: CHATHAM COUNTY RAINFALL DISTRIBUTIONS
It has been determined that the rainfall totals and intensities for Pittsboro, NC are
suitable for the entire County and as shall be used as the rainfall data for
Chatham County. This information is from the current NOAA National Weather
Service Precipitation Frequency Data Server (PFDS) for Pittsboro, NC (latitude
35.71, longitude-79.18)
This table can also be found at: http://hdsc.nws.noaa.gov/hdsc/pfds/orb/nc pfds.html.
Duration
min
1
2
.� 5
.>1 10
v 25
C
50
Cr
14) 100
U. 200
500
1000
0.42
0.50
0.57
0.63
0.69
0.73
0.77
0.80
0.84
0.86
Chatham County Precipitation inches
10 15 30 1 2 3 6 12 24
min min rain hr hr hr hr hr hr
0.67
0.84
1.15
1.43
1.69
1.80
2.15
2.55
2.96
0.79
1.00
1.38
1.73
2.05
2.18
2.60
3.08
3.57
0.92
1.16
1.65
2.12
2.54
2.71
3.24
3.85
4.47
1.01
1 1.27
1.85
1 2.40
2.90
3,12
1 3.74
4.48
5.18
1.10
1.40
2.07
2.76
3.37
3.65
4.41
5.33
1 6.13
1.17
1.48
2.23
3.02
3.73
4.07
4.94
6.01
6.89
1.23
1.55
2.37
3.27
4.08
4.49
5.48
6.72
7.67
1.27
1.61
2.50
3.51
4.42
4.92
6.04
7.47
8.46
1.33
1.67
2.66
3.81
4.87
5.49
6.79
8.50
9.56
1.36
1.71
2.77
4.04
5.21
5.93
7.39
9.34
10.43
Chatham County Rainfall Intensities inchesihour
Duration
5 10 15 30 1 2 3 6 12 24
min min min mire hr hr hr hr hr hr
1
5.04
4.02
3.36
2.30
1.43
0.85
0.60
0.36
0.21
0.12
2
6.00
4.74
4.00
2.76
1.73
1.03
0.73
0.43
0.26
0.15
.� 5
6.84
5.52
4.64
3.30
2.12
1.27
0.90
0.54
0.32
0.19
>1
10
7.56
6.06
5.08
3.70
2.40
1.45
1.04
0.62
0.37
0.22
25
8.28
6.60
1 5.60
4.14
1 2.76
1.69
1.22
0.74
0.44
0.26
7 50
8.76
7.02
1 5.92
4.46
3.02
1.87
1.36
0.82
0.50
0.29
Cr
14) 100
9.24
7.38
6.20
4.74
3.27
2.04
1.50
0.91
0.56
0.32
LL
200
9.60
7.62
6.44
5.00
3.51
2.21
1.64
1.01
0.62
0.35
500
10.08
7.98
6.68
5.32
3.81
2.44
1.83
1.13
0.71
0.40
1000
10.32 J
8.16
1 6.84
5.54 1
4.04
2.61
1.98
1.23
0.78
0.43
26

CI4ATHAM COUNTY STORMWATER ORDINANCE NOVEMBER 24, 2008
AMENDED AUGUST 15.2016
APPENDIX B: CURVE NUMBERS
The tables below are the accepted values for Curve Numbers (CN) in Chatham
County for Hydrological Analysis, Other CN Tables may be used as deemed
appropriate by the Stormwater Administrator:
CURVE NUMBERS FOR VARIOUS HYDROLOGICAL CONDITIONS
average;
Hydrologic Soil Group
Pervious Areas; pev" a
A
B
C D
P. 6k . Golf Courses, Lawns. Cemeteries, etc.
Pow condition (grass cover c 5©1Q
88
79
86 89
Fair condition (grass cover 50% 1s 76%)
49
69
79 84
Good condition (grass cover 76 %, to 95%Q
39
61
74 8o
Very Good condition (grass cover > 95%)
M
55
70 77
Woods and Grass combination (parks. orchards and tree farms)
Poor condition (round cover sparse)
57
73
82 86
Fair condition ;ground cover moderate)
43
65
76 82
Good condition (Wound cover good}
32
58
72 79
Very Good condition (ground cover exoelent)
28
53
69 76
Natcanal,'State Forre5t
Poor condition (ground cover sparse: c 54g'c)
45
66
77 83
Fair condition (ground cover moderate; 50ke to 7514)
38
60
73 79
Good condition (ground cover good: 75% to 95%)
30
55
70 77
Very Good condition (ground cover excelent: > 951/)
25
50
68 75
Impervious Areas:
Paved parking rots. roofs. driveways, eV
96
9a
48 98
Streets and roads:
Paved; curbs and storm sewers (excluding ROW)
98
98
96 98
Paved; curbs. storm sewers. sdewalks & grass plot {including ROW)
86
91
93 95
Paved: curbs, storm sewers. sidewalks a tree Plot (including ROW)
62
88
91 92
Paved: open ditches (including ROW)
83
89
92 93
Grave€ (including rigi}i•of-wayl
76
85
69 91
Dlrt (Including right-of-wayl
72
62
87 89
Urban Districts:
Comrnercial and busroess
85
89
92
94 95
Industrial
72
61
88
91 93
Residential Districts by average tot size:
Ila acre or less (town, house)
65
77
85
90 92
114 acre
38
61
76
83 87
113 acre
30
57
72
81 66
162 acre
25
SA
70
80 85
1 acre
20
51
68
79 84
2 acres
12
46
65
77 82
Developing urban Areas:
Neely graded areas (pervious areas only)
Poor condition (No vegetation. Bare Soil)
77
86
91 94
Fair condition (Sparse vegetation, Some ground cover)
76
85
90 93
Good condition (Established vegetation, grouml cover good)
74
83
69 91
Very Good condition (ground cover excelent. Hydroseed, Flexterra)
68
79
85 88
note: Some cured rwmbm am interpolated bmso on simrrar hydrorog'sead eondiuom end engineering odgnem; JWH
27

PRE DEVELOPED

Hydrograph Report 1
Hydraf low Hydrographs Extension for AutoCAD® Civil 3D& 2018 by Autodesk, Inc. v2018.3 Wednesday, 08 / 2612020
Hyd. No. 1
PRE DEV
Hydrograph type
= SCS Runoff
Peak discharge
= 14.70 cfs
Storm frequency
= 1 yrs
Time to peak
= 12.40 hrs
Time interval
= 2 min
Hyd, volume
= 92,863 cuft
Drainage area
= 35.000 ac
Curve number
= 71
Basin Slope
= 0.0 %
Hydraulic length
= 0 ft
Tc method
= User
Time of conc. (Tc)
= 45.00 min
Total precip.
= 2.96 in
Distribution
= Type II
Storm duration
= 24 hrs
Shape factor
= 484
Q (cfs)
15.00
12.00
Wil1l
3,00
0.00
0 2 4
Hyd No. 1
PRE DEV
Hyd. No. 1 -- 1 Year
Q (cfs)
15.00
12.00
• MII
.M
[a1[1I11
0.00
6 8 10 12 14 16 18 20 22 24 26
Time (hrs)

Hydrograph Report 2
Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2018 by Autodesk, Inc. v2018.3 Wednesday, 08 / 26 12020
Hyd. No. 1
PRE DEV
Hydrograph type
= SCS Runoff
Peak discharge
= 23.81 cfs
Storm frequency
= 2 yrs
Time to peak
= 12.37 hrs
Time interval
= 2 min
Hyd. volume
= 139,578 cuft
Drainage area
= 35.000 ac
Curve number
= 71
Basin Slope
= 0.0 %
Hydraulic length
= 0 ft
Tc method
= User
Time of conc. (Tc)
= 45.00 min
Total precip.
= 3.57 in
Distribution
= Type II
Storm duration
= 24 hrs
Shape factor
= 484
Q (cfs)
24.00
20.00
16.00
12.00
M11117
4.00
PRE DEV
Hyd. No. 1 -- 2 Year
Q (cfs)
24.00
20.00
16.00
12.00
8.00
4.00
0.00 Lj I 1_ i 1 1 1 1N.- 1 0.00
0 2 4 6 8 10 12 14 16 18 20 22 24 26
- Hyd No. 1
Time (hrs)

Hydrograph Report 3
Hydraf low Hydrographs Extension for AutoCAD RO Civil 3D0 2018 by Autodesk, Inc. v2018.3 Wednesday, 08 / 2612020
Hyd. No. 1
PRE DEV
Hydrograph type
= SCS Runoff
Peak discharge
= 51.80 cfs
Storm frequency
= 10 yrs
Time to peak
= 12.37 hrs
Time interval
= 2 min
Hyd. volume
= 283,750 cult
Drainage area
= 35.000 ac
Curve number
= 71
Basin Slope
= 0.0 %
Hydraulic length
= Oft
Tc method
= User
Time of conc. (Tc)
= 45.00 min
Total precip.
= 5.18 in
Distribution
= Type II
Storm duration
= 24 hrs
Shape factor
= 484
Q (cfs)
60.00
50.00
40.00
30.00
20.00
10.00
M
PRE DEV
Hyd. No. 1 -- 10 Year
Q (cfs)
60.00
50.00
40.00
30.00
20.00
10.00
0 00
0 2 4 6 8 10 12 14 16 18 20 22 24 26
Hyd No. 1
Time (hrs)

1
Hydrograph Report
Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2018 by Autodesk, Inc. v2018.3 Wednesday, 0812612020
Hyd. No. 1
PRE DEV
Hydrograph type
= SCS Runoff
Peak discharge
= 69.93 cfs
Storm frequency
= 25 yrs
Time to peak
= 12.37 hrs
Time interval
= 2 min
Hyd. volume
= 378,232 tuft
Drainage area
= 35.000 ac
Curve number
= 71
Basin Slope
= 0.0 %
Hydraulic length
= 0 ft
Tc method
= User
Time of conc. (Tc)
= 45.00 min
Total precip.
= 6.13 in
Distribution
= Type II
Storm duration
= 24 hrs
Shape factor
= 484
Q (cfs)
70.00
60.00
50.00
40.00
30.00
20.00
10.00
PRE DEV
Hyd. No. 1 -- 25 Year
Q (cfs)
70.00
60.00
50.00
40.00
30.00
20.00
10.00
0.00 1 1 1 1 i _ - 1 I I 1 1 I I M% 1 0.00
0 2 4 6 8 10 12 14 16 18 20 22 24 26
Hyd No. 1 Time (hrs)

Hydrograph Report 2
Hydraflow Hydrographs Extension for AutoCADO Civil 3D® 2018 by Autodesk, Inc. v2018.3 Wednesday, 08 126 12020
Hyd. No. 1
PRE DEV
Hydrograph type
= SCS Runoff
Peak discharge
= 84.97 cfs
Storm frequency
= 50 yrs
Time to peak
= 12.37 hrs
Time interval
= 2 min
Hyd. volume
= 457,203 cult
Drainage area
= 35.000 ac
Curve number
= 71
Basin Slope
= 0.0 %
Hydraulic length
= 0 ft
Tc method
= User
Time of cone. (Tc)
= 45.00 min
Total precip.
= 6.89 in
Distribution
= Type II
Storm duration
= 24 hrs
Shape factor
= 484
PRE DEV
Q (cfs) Hyd. No. 1 -- 50 Year Q (cfs)
90.00
80.00
70.00
60.00
50.00
40.00
30.00
20.00
10.00
000
90.00
80.00
70.00
60.00
50.00
40.00
30.00
20.00
10.00
0 00
0 2 4 6 8 10 12 14 16 18 20 22 24 26
Hyd No, 1 Time (hrs)

3
Hydrograph Report
Hydraflow Hydrographs Extension for AutoCADO Civil 3D® 2018 by Autodesk, Inc. v2018.3 Wednesday, 08126 12020
Hyd. No. 1
PRE DEV
Hydrograph type
= SCS Runoff
Peak discharge
= 100.75 cfs
Storm frequency
= 100 yrs
Time to peak
= 12.37 hrs
Time interval
= 2 min
Hyd. volume
= 540,669 cult
Drainage area
= 35.000 ac
Curve number
= 71
Basin Slope
= 0.0 %
Hydraulic length
= 0 ft
Tc method
= User
Time of conc. (Tc)
= 45.00 min
Total precip.
= 7.67 in
Distribution
= Type II
Storm duration
= 24 hrs
Shape factor
= 484
PRE DEV
Q (cfs)
Hyd. No. 1 -- 100 Year Q (cfs)
120.00
100.00
80.00
60.00
40.00
20.00
000
120.00
100.00
80.00
60.00
40.00
20.00
000
0 2 4 6 8 10 12 14 16 18 20 22 24 26
Time (hrs)
Hyd No. 1

POST DEVELOPED

Hydrograph Report 1
Hydraflow Hydrographs Extension for AutoCAD® Civil 3DO 2018 by Autodesk, Inc. v2018.3 Wednesday, 08126 12020
Hyd. No. 2
POST
Hydrograph type
= SCS Runoff
Peak discharge
= 14.70 cfs
Storm frequency
= 1 yrs
Time to peak
= 12.40 hrs
Time interval
= 2 min
Hyd. volume
= 92,863 cuft
Drainage area
= 35.000 ac
Curve number
= 71 *
Basin Slope
= 0.0 %
Hydraulic length
= 0 ft
Tc method
= User
Time of conc. (Tc)
= 45.00 min
Total precip.
= 2.96 in
Distribution
= Type II
Storm duration
= 24 hrs
Shape factor
= 484
Composite (Area/CN) = [(34.200 x 71) + (0.800 x 87)] 135.000
Q (cfs)
15.00
12.00
• iI
i0
3.00
0.00
0 2 4
- Hyd No. 2
6 8
POST
Hyd. No. 2 -- 1 Year
Q (cfs)
15.00
12.00
M
3.00
0.00
10 12 14 16 18 20 22 24 26
Time (hrs)

Hydrograph Report 2
Hydraflow Hydrographs Extension forAutoCAD® Civil 3DO 2018 by Autodesk, Inc. v2018.3 Wednesday, 08126 12020
Hyd. No. 2
POST
Hydrograph type
= SCS Runoff
Peak discharge
= 23.81 cfs
Storm frequency
= 2 yrs
Time to peak
= 12.37 hrs
Time interval
= 2 min
Hyd. volume
= 139,578 cult
Drainage area
= 35.000 ac
Curve number
= 71 *
Basin Slope
= 0.0 %
Hydraulic length
= 0 ft
Tc method
= User
Time of conc. (Tc)
= 45.00 min
Total precip.
= 3.57 in
Distribution
= Type II
Storm duration
= 24 hrs
Shape factor
= 484
" Composite (Area/CN) = ](34.200 x 71) + (0.800 x 87)] 135.000
Q (cfs)
24.00
20.00
12.00
: M
4.00
POST
Hyd. No. 2 -- 2 Year
Q (cfs)
24.00
20.00
16.00
12.00
4.00
0.00 0.00
0 2 4 6 8 10 12 14 16 18 20 22 24 26
Hyd No. 2
Time (hrs)

Hydrograph Report 3
Hydraflow Hydrographs Extension for AutoCADO Civil 31D0 2018 by Autodesk, Inc. v2018.3 Wednesday, 08126 12020
Hyd. No. 2
POST
Hydrograph type
= SCS Runoff
Peak discharge
= 51.80 cfs
Storm frequency
= 10 yrs
Time to peak
= 12.37 hrs
Time interval
= 2 min
Hyd. volume
= 283,750 cuft
Drainage area
= 35.000 ac
Curve number
= 71*
Basin Slope
= 0.0 %
Hydraulic length
= Oft
Tc method
= User
Time of conc. (Tc)
= 45.00 min
Total precip.
= 5.18 in
Distribution
= Type II
Storm duration
= 24 hrs
Shape factor
= 484
Composite (Area1CN) = [(34.200 x 71) + (0.800 x 87)] 135.000
POST
Q (cfs) Hyd. No. 2 -- 10 Year Q (cfs)
80.00
50.00
40.00
30.00
20.00
10.00
0.00
60.00
50.00
40.00
30.00
20.00
10.00
0 00
0 2 4 6 8 10 12 14 16 18 20 22 24 26
= Hyd No. 2
Time (hrs)

Hydrograph Report 4
Hydraflow Hydrographs Extension forAutoCAD® Civil 3D® 2018 by Autodesk, Inc. v2018.3 Wednesday, 0812612020
Hyd. No. 2
POST
Hydrograph type
= SCS Runoff
Peak discharge
= 69.93 cfs
Storm frequency
= 25 yrs
Time to peak
= 12.37 hrs
Time interval
= 2 min
Hyd. volume
= 378,232 cuft
Drainage area
= 35.000 ac
Curve number
= 71 *
Basin Slope
= 0.0 %
Hydraulic length
= 0 ft
Tc method
= User
Time of conc. (Tc)
= 45.00 min
Total precip.
= 6.13 in
Distribution
= Type II
Storm duration
= 24 hrs
Shape factor
= 484
" Composite (Area/CN) = [(34.200 x 71) + (0.800 x 87)] 135,000
POST
Q (cfs) Q (cfs)
Hyd. No. 2 -- 25 Year
70.00
60.00
50.00
40.00
30.00
20.00
10.00
0.00
70.00
60.00
50.00
40.00
30.00
20.00
10.00
0 00
0 2 4 6 8 10 12 14 16 18 20 22 24 26
Hyd Na. 2
Time (hrs)

Hydrograph Report 5
Hydraflow Hydrographs Extension for AutoCAD® Civil 3DO 2018 by Autodesk, Inc. v2018.3 Wednesday, 0812612020
Hyd. No. 2
POST
Hydrograph type
= SCS Runoff
Peak discharge
= 84.97 cfs
Storm frequency
= 50 yrs
Time to peak
= 12.37 hrs
Time interval
= 2 min
Hyd, volume
= 457,203 cult
Drainage area
= 35.000 ac
Curve number
= 71*
Basin Slope
= 0.0 %
Hydraulic length
= 0 ft
Tc method
= User
Time of cons. (Tc)
= 45.00 min
Total precip.
= 6.89 in
Distribution
= Type II
Storm duration
= 24 hrs
Shape factor
= 484
Composite (Area1CN) = [(34.200 x 71) + (0.800 x 87)] 135.000
POST
Q (cfs) Hyd. No. 2 -- 50 Year Q (cfs)
90.00
80,00
70.00
60.00
50.00
40.00
30.00
20,00
10.00
U0
90.00
80.00
70.00
60.00
50.00
40.00
30.00
20.00
10.00
0 00
0 2 4 6 8 10 12 14 16 18 20 22 24 26
Hyd No. 2
Time (hrs)

Hydrograph Report 6
Hydraflow Hydrographs Extension for AutoCAD® Civil MD 2018 by Autodesk, Inc. v2018.3 Wednesday, 08126 12020
Hyd. No. 2
POST
Hydrograph type
= SCS Runoff
Peak discharge
= 100.75 cfs
Storm frequency
= 100 yrs
Time to peak
= 12.37 hrs
Time interval
= 2 min
Hyd. volume
= 540,669 cuft
Drainage area
= 35.000 ac
Curve number
= 71 *
Basin Slope
= 0.0 %
Hydraulic length
= 0 ft
Tc method
= User
Time of conc. (Tc)
= 45.00 min
Total precip.
= 7.67 in
Distribution
= Type II
Storm duration
= 24 hrs
Shape factor
= 484
* Composite (Area/CN) = [(34.200 x 71) + (0.800 x 87)] 135.000
POST
Q (cfs) 0 (cfs)
Hyd. No. 2 -- 100 Year
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20.00
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100.00
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40.00
20.00
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Hyd No. 2
Time (hrs)

SOILS REPORT

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Custom Soil Resource Report
Map Unit Legend
Map Unit Symbol
Map Unk Name
Acres In A01
Percent of A01
Gab
Georgeville silt loam, 2 to 6
2.0
3.7%
percent slopes
GaC
Georgeville silt loam, 6 to 10
3.8
7.0%
percent slopes
GeB2
Georgeville silty clay loam, 2 to
10.9
19.9%
6 percent slopes, moderately
eroded
GkD
Georgeville-Badin complex, 10
1.4
2.5%
to 15 percent slopes
GoC
Goldstan-Badin complex, 2 to
13.8
25.3%
15 percent slopes
NaB
Nanford-Badin complex, 2 to 6
20.3
37.0%
percent slopes
NaC
Nanford-Badin complex, 6 to 10
2.5
4.6%
percent slopes
Totals for Area of Interest
54,7
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
11

Custom Soil Resource Report
descriptions along with some characteristics of each. A few areas of minor
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
Chatham County, North Carolina
GaB—Georgeville silt loam, 2 to 6 percent slopes
Map Unit Setting
!National map unit symbol: 2vy6v
Elevation: 160 to 820 feet
Mean annual precipitation: 43 to 47 inches
Mean annual air temperature: 57 to 61 degrees F
Frost -free period: 200 to 230 days
Farmland classification; All areas are prime farmland
Map Unit Composition
Georgeville and similar soils: 90 percent
Minor components: 10 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Georgeville
Setting
Landform: Interfluves
Landform position (two-dimensional): Summit, shoulder
Landform position (three-dimensional): Interfluve
Down -slope shape: Convex
Across -slope shape: Convex
Parent material: Residuum weathered from metavolcanics and/or residuum
weathered from argillite and/or residuum weathered from phyllite and/or
residuum weathered from sericite schist
Typical profile
Ap - 0 to 9 inches. silt loam
E - 9 to 14 inches: silt loam
Btl - 14 to 20 inches. silty clay loam
Bt2 - 20 to 27 inches: clay
Bt3 - 27 to 49 inches: silty clay
BCt - 49 to 57 inches: silty clay loam
C - 57 to 62 inches: silt loam
Properties and qualities
Slope: 2 to 6 percent
Depth to restrictive feature: More than 80 inches
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 capacity: Moderate (about 9.0 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 2e
Hydrologic Soil Group: B
Hydric soil rating: No
13

Custom Soil Resource Report
Minor Components
Tarrus
Percent of map unit.- 10 percent
Landform; Interfluves
Landform position (two-dimensional): Summit, shoulder
Landform position (three-dimensional): Interfluve
Down -slope shape: Convex
Across -slope shape: Convex
Hydric soil rating: No
GaC—Georgeville silt loam, 6 to 10 percent slopes
Map Unit Setting
National map unit symbol: 2vy6n
Elevation: 160 to 820 feet
Mean annual precipitation: 43 to 47 inches
Mean annual air temperature: 57 to 61 degrees F
Frost -free period: 200 to 230 days
Farmland classification: Farmland of statewide importance
Map Unit Composition
Georgeville and similar soils: 90 percent
Minor components: 10 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Georgeville
Setting
Landform: Hillslopes
Landform position (two-dimensional): Backslope, shoulder
Landform position (three-dimensional): Side slope
Down -slope shape: Convex
Across -slope shape: Convex
Parent material. Residuum weathered from metavolcanics and/or residuum
weathered from argillite and/or residuum weathered from phyllite and/or
residuum weathered from sericite schist
Typical profile
Ap - 0 to 7 inches: silt loam
BE - 7 to 10 inches: silty clay loam
Bt - 10 to 44 inches: clay
BC - 44 to 53 inches: silty clay loam
C - 53 to 80 inches: loam
Properties and qualities
Slope: 6 to 10 percent
Depth to restrictive feature: More than 80 inches
Drainage class: Well drained
14

Custom Soil Resource Report
Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high
(0.57 to 1.98 inlhr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Available water capacity., High (about 9.2 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 3e
Hydrologic Soil Group: B
Hydric soil rating: No
Minor Components
Tarrus
Percent of map unit: 10 percent
Landform: Interfluves
Landform position (two-dimensional): Shoulder, backslope
Landform position (three-dimensional): Interfluve
Down -slope shape: Convex
Across -slope shape: Convex
Hydric soil rating: No
GeB2—Georgeville silty clay loam, 2 to 6 percent slopes, moderately
eroded
Map Unit Setting
National map unit symbol: 1Ivv4
Elevation: 200 to 1,400 feet
Mean annual precipitation: 37 to 60 inches
Mean annual air temperature: 59 to 66 degrees F
Frost -free period: 200 to 240 days
Farmland classification: All areas are prime farmland
Map Unit Composition
Georgeville, moderately eroded, and similar soils. 88 percent
Minor components: 12 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Georgeville, Moderately Eroded
Setting
Landform: I me rfluves
Landform position (two-dimensional): Summit
Landform position (three-dimensional): Interfluve
Down -slope shape: Convex
Across -slope shape: Convex
Parent material: Residuum weathered from metavolcanics and/or argillite
15

Custom Soil Resource Report
Typical profile
Ap - 0 to 7 inches: silty clay loam
Btl - 7 to 44 inches: clay
Bt2 - 44 to 52 inches: silty clay loam
C - 52 to 80 inches: silt loam
Properties and qualities
Slope: 2 to 6 percent
Depth to restrictive feature: More than 80 inches
Drainage class: Well drained
Runoff class: Low
Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high
(0.57 to 1.98 inlhr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Available water capacity. Moderate (about 8.9 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 2e
Hydrologic Soil Group: B
Hydric soil rating: No
Minor Components
Tarrus, moderately eroded
Percent of map unit: 8 percent
Landform: Interfluves
Landform position (two-dimensional): Summit
Landform position (three-dimensional): Intertluve
Down -slope shape: Convex
Across -slope shape: Convex
Hydric soil rating: No
Lignum
Percent of map unit., 4 percent
Landform: I nterfl uves
Landform position (two-dimensional): Summit
Landform position (three-dimensional): Interfluve
Down -slope shape: Convex
Across -slope shape: Linear
Hydric soil rating: No
GkD—Georgeville-Bailin complex, 10 to 15 percent slopes
Map Unit Setting
National map unit symbol: 1lvvd
Elevation: 300 to 650 feet
Mean annual precipitation: 37 to 60 inches
16

Custom Soil Resource Report
Mean annual air temperature: 59 to 66 degrees F
Frost -free period: 200 to 240 days
Farmland classification: Farmland of statewide importance
Map Unit Composition
Georgeville and similar soils: 66 percent
Badin and similar soils: 19 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Georgeville
Setting
Landform: Hillslopes on ridges
Landform position (two-dimensional). Backslope, shoulder
Landform position (three-dimensional): Side slope
Down -slope shape: Linear
Across -slope shape: Convex
Parent material. Residuum weathered from metavolcanics and/or argillite
Typical profile
Ap - 0 to 7 inches: silt loam
BE - 7 to 10 inches: silty clay loam
Bt - 10 to 44 inches: clay
BC - 44 to 53 inches: silty clay loam
C - 53 to 80 inches: loam
Properties and qualities
Slope: 10 to 15 percent
Depth to restrictive feature: More than 80 inches
Drainage class. Well drained
Runoff class: Medium
Capacity of the most limiting layer to transmit water (Ksat): Moderately high to high
(0.57 to 1.98 inlhr)
Depth to water table. More than 80 inches
Frequency of flooding None
Frequency of ponding: None
Available water capacity. High (about 9.2 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 3e
Hydrologic Soil Group: B
Hydric soil rating: No
Description of Badin
Setting
Landform: Hillslopes on ridges
Landform position (two-dimensional): Backslope, shoulder
Landform position (three-dimensional): Side slope
Down -slope shape: Linear
Across -slope shape: Convex
Parent material: Residuum weathered from metavolcanics and/or argillite
Typical profile
Ap - 0 to 6 inches: silt loam
Bt - 6 to 24 inches: clay
17

Custom Soil Resource Report
BC - 24 to 32 inches: silty clay
Cr- 32 to 80 inches: weathered bedrock
Properties and qualities
Slope: 10 to 15 percent
Depth to restrictive feature: 20 to 40 inches to paralithic bedrock
Drainage class: Well drained
Runoff class: Medium
Capacity of the most limiting layer to transmit water (Ksat): Very low to high (0.00
to 1.98 inlhr)
Depth to water table. More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Available water capacity: Low (about 5.5 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated). 3e
Hydrologic Soil Group: C
Hydric soil rating: No
GoC—Goldston-Badin complex, 2 to 15 percent slopes
Map Unit Setting
National map unit symbol. 1lvvr
Elevation: 200 to 650 feet
Mean annual precipitation: 37 to 60 inches
Mean annual air temperature: 59 to 66 degrees F
Frost -free period: 200 to 240 days
Farmland classification: Not prime farmland
Map Unit Composition
Goldston and similar soils: 55 percent
Badin and similar soils: 30 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Goldston
Setting
Landform: Hillslopes on ridges
Landform position (two-dimensional): Backslope
Landform position (three-dimensional): Side slope
Down -slope shape: Linear
Across -slope shape: Convex
Parent material: Residuum weathered from metavolcanics and/or argillite
Typical profile
A - 0 to 7 inches: very channery silt loam
Bw - 7 to 11 inches: very channery silt loam
Cr- 11 to 23 inches: weathered bedrock
R - 23 to 80 inches. unweathered bedrock
18

Custom Soil Resource Report
Properties and qualities
Slope: 8 to 15 percent
Depth to restrictive feature: 10 to 20 inches to paralithic bedrock; 20 to 40 inches
to lithic bedrock
Drainage class. Well drained
Runoff class: Medium
Capacity of the most limiting layer to transmit water (Ksat): Very low to high (0.00
to 1.98 inlhr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Available water capacity: Very low (about 1.2 inches)
Interpretive groups
Land capability classification (irrigated). None specified
Land capability classification (nonirrigated): 4s
Hydrologic Soil Group: D
Hydric soil rating.- No
Description of Badin
Setting
Landform: Hillslopes on ridges
Landform position (two-dimensional): Backslope
Landform position (three-dimensional): Side slope
Down -slope shape: Linear
Across -slope shape: Convex
Parent material. Residuum weathered from metavolcanics and/or argillite
Typical profile
A - 0 to 2 inches: channery silt loam
E - 2 to 9 inches: channery silt loam
Bt1 - 9 to 21 inches: channery silty clay loam
Bt2 - 21 to 36 inches: silty clay
Cr - 36 to 45 inches: weathered bedrock
R - 45 to 80 inches: unweathered bedrock
Properties and qualities
Slope: 8 to 15 percent
Depth to restrictive feature: 20 to 40 inches to paralithic bedrock; 40 to 80 inches
to lithic bedrock
Drainage class: Well drained
Runoff class: Medium
Capacity of the most limiting layer to transmit water (Ksat): Very low to high (0.00
to 1.98 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Available water capacity: Moderate (about 6.1 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 3e
Hydrologic Soil Group: C
Hydric soil rating. No
19

Custom Soil Resource Report
NaB—Nanford-Badin complex, 2 to 6 percent slopes
Map Unit Setting
National map unit symbol: 1 Ivxl
Elevation: 300 to 650 feet
Mean annual precipitation: 37 to 60 inches
Mean annual air temperature: 59 to 66 degrees F
Frost -free period: 200 to 240 days
Farmland classification: All areas are prime farmland
Map Unit Composition
Nanford and similar soils: 36 percent
Badin and similar soils: 33 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Nanford
Setting
Landform: Interfluves
Landform position (two-dimensional): Summit
Landform position (three-dimensional): Interfluve
Down -slope shape: Convex
Across -slope shape: Convex
Parent material: Residuum weathered from metavolcanics and/or argillite
Typical profile
Ap - 0 to 3 inches: silt loam
E - 3 to 7 inches: silt loam
Btl - 7 to 12 inches: silty clay
Bt2 - 12 to 27 inches: silty clay
BC - 27 to 38 inches: silty clay loam
C - 38 to 57 inches: silt loam
Cr- 57 to 80 inches: weathered bedrock
Properties and qualities
Slope: 2 to 6 percent
Depth to restrictive feature: 40 to 60 inches to paralithic bedrock
Drainage class: Well drained
Runoff class: Low
Capacity of the most limiting layer to transmit water (Ksat): Very low to high (0.00
to 1.98 inlhr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Available water capacity: Moderate (about 7.9 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 2e
Hydrologic Soil Group. B
20

Custom Soil Resource Report
Hydric soil rating: No
Description of Badin
Setting
Landform: Interfluves
Landform position (two-dimensional): Summit
Landform position (three-dimensional): Interfluve
Down -slope shape: Convex
Across -slope shape: Convex
Parent material: Residuum weathered from metavolcanics and/or argillite
Typical profile
Ap - 0 to 6 inches: silt loam
Bt - 6 to 24 inches: clay
BC - 24 to 32 inches: channery silty clay loam
Cr- 32 to 80 inches: weathered bedrock
Properties and qualities
Slope: 2 to 6 percent
Depth to restrictive feature: 20 to 40 inches to paralithic bedrock
Drainage class: Well drained
Runoff class: Low
Capacity of the most limiting layer to transmit water (Ksat): Very low to high (0.00
to 1.98 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Available water capacity: Low (about 5.5 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 2e
Hydrologic Soil Group: C
Hydric soil rating: No
NaC--Nanford-Badin complex, 6 to 10 percent slopes
Map Unit Setting
National map unit symbol: 1 Ivxn
Elevation: 300 to 650 feet
Mean annual precipitation: 37 to 60 inches
Mean annual air temperature: 59 to 66 degrees F
Frost -free period: 200 to 240 days
Farmland classification: Farmland of statewide importance
Map Unit Composition
Nanford and similar soils: 50 percent
Badin and similar soils: 30 percent
Estimates are based on observations, descriptions, and transects of the maounit.
21

Custom Soil Resource Report
Description of Nanford
Setting
Landform: Hillslopes on ridges
Landform position (two-dimensional): Summit, shoulder
Landform position (three-dimensional): Side slope
Down -slope shape: Linear
Across -slope shape: Convex
Parent material: Residuum weathered from metavolcanics and/or argillite
Typical profile
Ap - 0 to 3 inches: silt loam
E - 3 to 7 inches: silt loam
Bt1 - 7 to 12 inches: silty clay
Bt2 - 12 to 27 inches: silty clay
BC - 27 to 38 inches: silty clay loam
C - 38 to 57 inches: silt loam
Cr - 57 to 80 inches: weathered bedrock
Properties and qualities
Slope: 6 to 10 percent
Depth to restrictive feature: 40 to 60 inches to paralithic bedrock
Drainage class. Well drained
Runoff class: Medium
Capacity of the most limiting layer to transmit water (Ksat): Very low to high (0.00
to 1.98 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Available water capacity. Moderate (about 7.9 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 3e
Hydrologic Soil Group: B
Hydric soil rating: No
Description of Badin
Setting
Landform: Hillslopes on ridges
Landform position (two-dimensional): Summit, shoulder
Landform position (three-dimensional): Side slope
Down -slope shape: Linear
Across -slope shape: Convex
Parent material: Residuum weathered from metavolcanics and/or argillite
Typical profile
Ap - 0 to 6 inches: silt loam
Bt - 6 to 24 inches: clay
BC - 24 to 32 inches: channery silty clay loam
Cr- 32 to 80 inches. weathered bedrock
Properties and qualities
Slope: 6 to 10 percent
Depth to restrictive feature: 20 to 40 inches to paralithic bedrock
Drainage class: Well drained
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Custom Soil Resource Report
Runoff class: Medium
Capacity of the most limiting layer to transmit water (Ksat): Very low to high (0.00
to 1.98 inlhr)
Depth to water table. More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Available water capacity: Low (about 5.5 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 3e
Hydrologic Soil Group: C
Hydric soil rating: No
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