SW6221001_Soils/Geotechnical Report_20221214 (2)

HAL OWEN & ASSOCIATES, INC.
SOIL & ENVIRONMENTAL SCIENTISTS
P.O. Box 400, Lillington NC 27546-0400
Phone [phone] / Fax [phone]
www.halowensoil.com
3 December 2021
Mr. Gordon Rose
Gradient PLLC
230 Donaldson Street, Suite 500A
Fayetteville, NC 28301
Reference: Addendum to Report
Soil Scientist Investigation for Stormwater
Chicken Road and MacRidge Road, Fort Bragg
Dear Mr. Rose,
This addendum addresses additional data collected at SCM 3 after the final report was
submitted. A site investigation has been conducted for the above referenced property, located on
the southeast of the intersection of Chicken Road and MacRidge Road in Fayetteville,
Cumberland County, North Carolina. The purpose of this investigation was to provide a general
characterization of the soils in the area proposed for a stormwater infiltration device, including a
determination of the depth to evidence of a seasonal high water table and estimation of the
permeability of the various soil layers. In -situ hydraulic conductivity testing was not conducted.
All soil characteristics were described in accordance with the USDA Field Book for Describing
and Sampling Soils. This report represents my professional opinion as a Licensed Soil Scientist.
Hand -powered auger borings were used to make soil observations at SCM 3. A detailed
soil profile description for each boring is attached to this report. A red ribbon flag was hung at
the auger borings to facilitate survey location for the elevation. Soil morphological
characteristics indicating a seasonal high water table (SHWT) were observed at 88 and 65 inches
below surface at Boring 3A and 3B, respectively. The proposed area has significant slope and
the depth to the seasonal high water table also transitions from deep to more shallow as you
proceed down the slope. Infiltration rates (permeability) of the soil materials are most limited to
approximately 2.0 in/hr in the sandy clay loam layer from 32 to 88 inches below surface at 3A
and to approximately 1.5 in/hr in the sandy clay loam layer from about 54 to 65 inches below
surface at 3B.
I appreciate the opportunity to provide this service and trust that you will feel free to call
on me again in the future. If you have any questions or need additional information, please
contact me at your convenience.
Sincerely
JWA_'_�
Hal Owen
Licensed Soil Scientist
Soil Science Investigations * Wetland Delineations, Permitting, and Consulting

HAL OWEN & ASSOCIATES, INC.
Addendum to Report
Soil Scientist Investigation For Stormwater Management
Chicken Road and MacRidge Road, Fort Bragg
3 December 2021
Figure 1. Location of SCMs and soil auger borings
GRAPHIC SCALE
� Q amSY�•A 100
Soil Science Investigations * Wetland Delineations, Permitting, and Consulting

HAL OWEN & ASSOCIATES, INC.
Bottom of
Bottom of
SOIL PROFILE DESCRIPTIONS
FOR
STORMWATER MANAGEMENT DEVICES
PROJECT NAME: Chicken Road and MacRidge Road, Fort Bragg PROPOSED FACILITY: SCM
LOCATION OF SITE: MacRidge Road, Fayetteville COUNTY: Cumberland
EVALUATED BY: Hal Owen, NC Licensed Soil Scientist DATE EVALUATED: 11-29-21
EVALUATION METHOD: Auger Boring ®, Pit ❑
PROFILE: 3A Estimated Existing Ground Elevation = 265.2
HORIZON
DEPTH
(�
MATRIX
MOTTLES
TEXTURE
STRUCTURE
CONSIS-
TENCE
PERMEABIL
ITY (IN/HR)
NOTES
0-8
Slow
Loamy fill
8-20
Yellow
SL
2 M GR
VFR
6.0
20-32
Yellow
SL
2 M SBK
FR
4.0
32-56
Yellow Brown
red
SCL
2 M SBK
FR
2.0
3asin (66) 56-88
Yellow Brown
Grey and red
SCL
2MSBK
FR
2.0
88-118
Yellow Brown
Grey and red
SL
1 M SBK
FR
4.0
118-120 variegated SCL I M SBK FR
AwT SHWT 88- EL = 257.9
VEGETATION
COMMENTS:
PROFILE: 3B Estimated Existing Ground Elevation = 262.9
HORIZON
DEPTH
(
MATRIX
MOTTLES
TEXTURE
STRUCTURE
CONSIS-
TENCE
PERMEABIL
ITY (IN/HR)
NOTES
Basin (38) 0-54
LS and SL
4+
54-65
SCL
1.5
65-84
variegated
C
0.5
AwT
VEGETATION
SHWT 65- EL = 257.5
COMMENTS:
Soil Science Investigations * Wetland Delineations, Permitting, and Consulting

HAL OWEN & ASSOCIATES, INC.
LEGEND OF ABBREVIATIONS FOR SOIL PROFILE DESCRIPTIONS
TEXTURE
S
- Sand
LS
- Loamy Sand
SL
- Sandy Loam
L
- Loam
SCL
- Sandy Clay Loam
CL
- Clay Loam
SiL
- Silt Loam
Si
- Silt
SiCL-
Silt Clay Loam
SC
- Sandy Clay
C
- Clay
SiC
- Silty Clay
O
- Organic
MOIST CONSISTENCE
L
- Loose
VFR
- Very Friable
FR
- Friable
FI
- Firm
VFI
- Very Firm
EFI
- Extremely Firm
AWT — Apparent Water Table
SHWT — Seasonal High Water Table
SLWT — Seasonal Low Water Table
MOTTLES
f — few 1 - fine F - Faint
c — common 2 - medium D - Distinct
in — many 3 - coarse P - Prominent
STRUCTURE
0
- structureless
VF
-very fine
G
- Single Grain
1
- weak
F
- fine
M
- Massive
2
- moderate
M
- medium
CR
- Crumb
3
- strong
C
- coarse
GR
- Granular
VC
- very coarse
SBK
- Subangular Blocky
ABK
-Angular Blocky
PL
- Platy
PR
- Prismatic
Soil Science Investigations * Wetland Delineations, Permitting, and Consulting