SW6191003_Soils Report_20191211

Southeastern Soil & Environmental Associates, Inc.
P.O. Box 9321
Fayetteville, NC 28311
Phone/Fax [phone]
Email [e-mail]
September 2, 2019
Mr. Scott Brown, PE
4D Site Solutions, Inc.
409 Chicago Drive, Suite 112
Fayetteville, NC 28306
Re: Hydraulic conductivity (permeability) analysis & Seasonal High -Water Table
determination (SHWT) for proposed stormwater retention area, Hobson Road Concrete
Plant, PIN 494560201353, Hobson Road, Hoke County, North Carolina
Dear Mr. Brown,
An evaluation of soil properties and hydraulic conductivity (Ksat) has been conducted at
your request on the aforementioned property. The purpose of the investigation was to
determine soil water table depths (SHWT) based on soil profiles. In addition, Ksat was
to be provided at varying depths for use with stormwater retention basin design.
Saturated hydraulic conductivity of the unsaturated zone was measured in a similar
method as described in the Soil Science Society of America Journal, Vol. 53, no 5, Sept. -
Oct. 1989, "A Constant Permeameter for Measuring Saturated Hydraulic Conductivity of
the Vadose Zone" and Comparison of the Glover Solution with the Simultaneous
Equations Approach for Measuring Hydraulic Conductivity." This consists of advancing
a small diameter bore hole to a predetermined depth. At this depth, a constant head
(pressure) was established and maintained. Flow measurements were made at timed
intervals after flow stabilized.
Soils at the proposed basin site are most similar to the Wagram soil series (see attached
boring log). Two borings were advanced to 12.00 feet below the ground surface.
Seasonal High -Water Table (SHWT) as determined by evidence of colors of chroma 2 or
less (and/or concentrations of high redox mottles) was not encountered within 12.0 feet
below the existing soil surface. No static water level was observed in either boring on
the day of testing.
SOIUSITE EVALUATION • SOIL PHYSICAL ANALYSIS • LAND USE/SUBDIVISION PLANNING • WETLANDS
GROUNDWATER DRAINAGF/MOUNDING • SURFACF/SUBSURFACE WASTE TREATMENT SYSTEMS, EVALUATION & DESIGN

Twelve 0 2) compact constant head permeameter (CCHP) tests were conducted at
varying depths ranging from 5.0 to 10.0 feet below the soil surface. The measured Ksat
rate ranged from 0.08 to 1.56 cm/hr (equivalent to 0.03 to 0.61 inches/hour).
The attached map shows locations of the sample points as well as Ksat location.
It should be noted that the reported SHWT does not necessarily reflect the elevation of
static groundwater (due to variations in groundwater recharge rates, annual rainfall,
drought conditions, etc.). Reported static water levels are simply a measurement on the
day of analysis.
The data presented in this report are limited by a number of considerations. The primary
consideration is that soil formations can be highly variable. The soils found on this site
can be subject to inclusions of other soil types, perched water, artesian conditions and/or
layers of undulating low permeability clay seams. These and other soil conditions can
have an effect on the steady state of groundwater flow. To the extent possible, we have
identified the soil types that will impact the flow of groundwater, and have provided a
professional opinion as to the depth of SHWT.
I trust this is the information you require at this time.
Sincerely,
Mike Eaker
NC Licensed Soil Scientist #1030
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Southeastern Soil & Environmental Associates, Inc.
P.Q. Box 9321
Fayetteviiie, NC 28311
Phone/Fax [phone]
Email mike @southeasternsoil.com
SHWT depths, Hobson Road Concrete Plant, Hobson Road, Hoke
County, NC
BORING SHWT DEPTH inches Observed Water finches)
1 >144 None
2 >144 None
SOIL/SITE EVALUATION • SOIL PHYSICAL ANALYSIS • LAND USE/SUBDIVISION PLANNING • WETLANDS
GROUNDWATER DRAINAGE/MOUNDING • SURFACE/SUBSURFACE WASTE TREATMENT SYSTEMS, EVALUATION & DESIGN

Southeastern Soil & Environmental Associates, Inc.
P.O. Box 9321
Fayetteville, NC 28311
Phone/Fax [phone]
Email [e-mail]
Measured Ksat Rates, Hobson Road Concrete Plant, Hobson Road,
Hoke County, NC
Location
Depth Cin
cmlhr
in/hr
B1
60
1.30
0.51
B1
72
0.25
0.10
B1
84
0.21
0.08
B1
96
0.28
0.11
B1
108
0.34
0.13
B1
120
0.51
0.20
B2
60
0.46
0.18
B2
72
0.37
0.15
B2
84
1.14
0.45
R2
96
1.56
0.61
B2
108
0.08
0.03
B2
120
0.08
0.03
SOIL/SITE EVALUATION . SOIL PHYSICAL ANALYSIS • LAND USF/SUBDfVIS€ON PLANNING • WETLANDS
GROUNDWATER DRAINAGE/MOUNDING • SURFACE/SUBSURFACE WASTE TREATMENT SYSTEMS, EVALUATION & DESIGN

Southeastern Soil & Environmental Associates, Inc.
P.O. Box 9321
Fayetteville, NC 28311
Phone/Fax [phone]
Email [e-mail]
Soil Boring Log (Bore 1), Hobson Road Concrete Plant, Hobson Road, Hoke
County, NC
This map unit consists of well drained soils that formed in loamy sediment on uplands.
Slope ranged from 0 to 1 percent.
A - 0 to 4 inches; dark brown (I OYR 3/3) loamy sand; single grained; loose; very friable;
common fine and medium roots; abrupt smooth boundary.
E - 4 to 20 inches; light yellowish brown (I OYR 6/4) loamy sand; about 10 percent clean
sand; single grained; loose; very friable; few fine and medium roots; clear smooth
boundary.
Bt - 20 to 31 inches; strong brown (7.5YR 5/6) sandy loam; weak fine and medium
subangular blocky structure; friable; gradual wavy boundary.
BC - 31 to 51 inches; reddish yellow (7.5YR 6/8) loamy sand; single grained; loose; very
friable; few fine and medium roots; gradual wavy boundary.
C I - 51 to 68 inches; yellowish red (5YR 518) sandy clay loam; weak medium and fine
subangular blocky structure; firm; gradual wavy boundary.
C2 - 68 to 80 inches; mottled yellowish red (5YR 5/8) and brownish yellow (1 OYR 6/8)
sandy clay loam; massive structure, firm; gradual wavy boundary.
C3 - 80 to 144 inches; yellowish red (5YR 6/8) sandy loam to sandy clay loam; massive
structure; friable to firm.
SHWT exceeds 144 inches
SOIL/SITE EVALUATION • SOIL PHYSICAL ANALYSIS • LAND USEISUBDIVISION PLANNING • WETLANDS
GROUNDWATER DRAINAGE/MOUNDING • SURFACE/SUBSURFACE WASTE TREATMENT SYSTEMS, EVALUATION & DESIGN

Southeastern Soil & Environmental Associates, Inc.
P.O. Box 9321
Fayetteville, NC 28311
Phone/Fax [phone]
Email [e-mail]
Soil Boring Log (Bore 2), Hobson Road Concrete Plant, Hobson Road, Hoke
County, NC
This map unit consists of well drained soils that formed in loamy sediment on uplands.
Slope ranged from 0 to 1 percent.
A - 0 to 4 inches; dark brown (1 OYR 3/3) loamy sand; single grained; loose; very friable;
common fine and medium roots; abrupt smooth boundary.
E - 4 to 14 inches; light yellowish brown (I OYR 6/4) loamy sand; about 10 percent clean
sand; single grained; loose; very friable; few fine and medium roots; clear smooth
boundary.
Bt - 14 to 27 inches; strong brown (7.5YR 5/6) sandy loam; weak fine and medium
subangular blocky structure; friable; gradual wavy boundary.
BC - 27 to 48 inches; reddish yellow (7.5YR 6/8) loamy sand; single grained; loose; very
friable; few fine and medium roots; gradual wavy boundary.
Cl - 48 to 60 inches; yellowish red (5YR 5/8) sandy clay loam; weak medium and fine
subangular blocky structure; firm; gradual wavy boundary.
C2 - 60 to 71 inches; mottled yellowish red (5YR 5/8) and brownish yellow (I OYR 6/8)
sandy clay loam; massive structure; firm; gradual wavy boundary.
C3 - 71 to 90 inches; yellowish red (5YR 6/8) sandy loam to sandy clay loam; pockets of
ironstone; massive structure; friable to firm.
C4 - 90 to 98 inches; yellowish red (5YR 5/8) loamy sand; single grained; loose; very
friable; few fine and medium roots; clear smooth boundary.
2C1- 98 to 126 inches; mixed mottled brown (7.5YR 5/4), strong brown (7.5YR 5/8) and
light gray (I OYR 7/1) silty clay; very firm; massive structure; clear smooth boundary.
2C2 - 126 to 144 inches; yellowish red (5YR 5/8) coarse loamy sand; many medium
prominent light yellowish brown (10YR 6/4) mottles; single grained; Ioose; very friable.
SHWT exceeds 144 inches
SOII_./SITE EVALUATION + SOIL PHYSICAL ANALYSIS • LAND USE/SUBDIVISION PLANNING • WETLANDS
GROUNDWATER DRAINAGE/MOUNDING • SURFACEISUBSURFACE WASTE TREATMENT SYSTEMS, EVALUATION & DESIGN

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SOIL/SITE EVALUATION • SOIL PHYSICAL ANALYSIS • LAND USE/SUBDIVISION PLANNING • WETLANDS
GROUNDWATER DRAINAGE/MOUNDING • SURFACE/SUBSURFACE WASTE TREATMENT SYSTFMS, EVALUATION & DESIGN

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