SW6221001_Soils/Geotechnical Report_20221214

HAL OWEN & ASSOCIATES, INC.
SOIL & ENVIRONMENTAL SCIENTISTS
P.O. Box 400, Lillington NC 27546-0400
Phone [phone] / Fax [phone]
www.halowensoil.com
7 January 2022
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 2 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.
A hand -powered auger boring was used to make a soil observation at SCM 2. The soils
at this site were observed to be disturbed by past human activities. The materials were observed
to be basically loamy textured but with chunks of parent material and also clayey material.
These observations lead to the conclusion that these materials are not local to the site but were
hauled there to form the existing roadway. A detailed soil profile description for this 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 86 inches below surface at Boring 2A. The infiltration rate
(permeability) of the soil materials is expected to be relatively slow because the structure has
been destroyed in the fill material. It appears that you may replace this material with more
permeable sands or we can return to the site to actually run hydraulic conductivity analysis. The
results of those tests would not likely be very reliable as one test may be significantly different
from a second test a few feet away, depending on the materials placed at the site.
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.
Solt Sincerely
Hal Owen
Licensed Soil Scientist
gations 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
7 January 2022
Figure 1. Location ofSCM2 and soil auger boring
CHItl(EN IgPD
GRAPHIC SCALE
A Q 1i 50 100
Located in SCM#2
Soil Science Investigations * Wetland Delineations, Permitting, and Consulting

HAL OWEN & ASSOCIATES, INC.
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: 29 December 2021
EVALUATION METHOD: Auger Boring ®, Pit ❑
PROFILE: 2A Estimated Existing Ground Elevation = 274.4
HORIZON It
(IIV)
MATRIX
MOTTLES
TEXTURE
STRUCTURE
CONSIS-
TENCE
PERMEABIL
ITY (IN/HR)
NOTES
Loamy
with
Basin
chunks of
(46) 0-90
Disturbed/Fill
— 0.2
parent
material
and clay
AWT SHWT 86 in EL = 267.2 SLOPE
VEGETATION
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