SW6241006_Soils/Geotechnical Report_20241118

Southeastern Soil & Environmental Associates, Inc.
P.O. Box 9321
Fayetteville, NC 28311
Phone/Fax [phone]
Email [e-mail]
September 3, 2024
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 potential stormwater retention/treatment area, 3492
Cumberland Road, REID 0416908493000, Fayetteville, Cumberland 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 logs). Two soil borings were advanced to 10.0 or more 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 encountered at depths
of 128 and 136 inches below the ground surface. Observed water levels were not
encountered within 130 inches below the ground surface on the day of testing.
SOIL/SITE EVALUATION • SOIL PHYSICAL ANALYSIS • LAND USE/SUBDIVISION PLANNING
GROUNDWATER DRAINAGE/MOUNDING • SURFACE/SUBSURFACE WASTE TREATMENT SYSTEMS. EVALUATION & DESIGN

Ten compact constant head permeameter (CCHP) tests were conducted at depths of 6, 7,
8, 9 and 10 feet below the ground surface. The measured Ksat rates ranged from 3.10
cm/hr. to 41.25 cm/hr. (equivalent to 1.22 to 16.24 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 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 s O I L s
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Southeastern Soil & Environmental Inc.
P.O. Box 9321
Fayetteville, NC 28311
Phone/Fax [phone]
Email [e-mail]
SHWT depths, Proposed Dollar General, 3492 Cumberland Rd.,
Fayetteville, Cumberland County, NC
BORING SHWT DEPTH (inches) Observed Water (inches)
1 136 None
2 128 130
SOIL/SITE EVALUATION • SOIL PHYSICAL ANALYSIS • LAND USE/SUBDIVISION PLANNING
GROUNDWATER DRAINAGE/MOUNDING • SURFACE/SUBSURFACE WASTE TREATMENT SYSTEMS. EVALUATION & DESIGN

Southeastern Soil & Environmental
Inc.
P.O. Box 9321
Fayetteville, NC 28311
Phone/Fax [phone]
Email [e-mail]
Measured Ksat Rates, Proposed Dollar General, 3492 Cumberland Rd.,
Fayetteville, Cumberland County, NC
Ksat Ksat
Location Depth (in) cm/hr in/hr
1 72 22.62 8.91
1 84 7.32 2.88
1 96 41.25 16.24
1 108 19.96 7.96
1 120 3.10 1.22
2 72 13.31 5.24
2 84 11.98 4.71
2 96 39.92 15.72
2 108 26.61 10.48
2 ,..% 120 2.64 1.04
SOIL/SITE EVALUATION • SOIL PHYSICAL ANALYSIS • LAND USE/SUBDIVISION PLANNING
GROUNDWATER DRAINAGE/MOUNDING • SURFACE/SUBSURFACE WASTE TREATMENT SYSTEMS. EVALUATION & DESIGN

Southeastern Soil & Environmental
Associates Inc.
P.O. Box 9321
a
Fayetteville, NC 28311
Phone/Fax [phone]
Email [e-mail]
Soil Boring Log (B1), Proposed Dollar General, 3492 Cumberland Rd., Fayetteville,
Cumberland 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 13 inches; yellowish brown (10YR 4/2) loamy sand; single grained; loose; very
friable; common fine and medium roots; abrupt smooth boundary.
E — 13-40 inches; light yellowish brown (2.5Y 6/4) loamy sand; weak fme granular
structure; very friable; many fine and medium roots; clear smooth boundary.
Bt - 40 to 56 inches; yellowish brown (10YR 5/8) sandy loam; weak fine subangular
blocky structure; friable; gradual diffuse boundary.
BC — 56 to 116 inches; brownish yellow (10YR 6/6) loam sand; many medium prominent
white (10YR 8/1) mottles; moderate fine granular structure; very friable; gradual diffuse
boundary.
B't - 116 to 136 inches; brownish yellow (10YR 6/6) sandy loam to sandy clay loam;
weak fine subangular blocky structure; firm; gradual diffuse boundary.
Cl - 136 to 143 inches; yellow (10YR 7/6) sandy loam; many medium prominent (5YR
5/8) and light gray (10YR 7/2) mottles; massive structure; friable.
SHWT @ 136 inches (10YR 7/2)
SOIL/SITE EVALUATION • SOIL PHYSICAL ANALYSIS • LAND USE/SUBDIVISION PLANNING
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 (B2), Proposed Dollar General, 3492 Cumberland Rd., Fayetteville,
Cumberland 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 16 inches; yellowish brown (10YR 4/2) loamy sand; single grained; loose; very
friable; common fine and medium roots; abrupt smooth boundary.
E — 16 to 39 inches; pale brown (2.5Y 7/4) loamy sand; weak fine granular structure;
very friable; many fine and medium roots; clear smooth boundary.
Bt - 39 to 63 inches; brownish yellow (10YR 6/6) sandy loam; weak fine subangular
blocky structure; friable; gradual diffuse boundary.
BC — 63 to 121 inches; olive yellow (2.5Y 6/8) loam sand; many medium prominent
white (10YR 8/1) pockets of clean sands; weak fine granular structure; very friable;
gradual diffuse boundary.
Cl - 121 to 128 inches; light yellowish brown (2.5Y 6/4) loam sand; massive structure;
very friable; gradual diffuse boundary.
Cl - 128 to 143 inches; gray (10YR 6/1) loamy sand; many medium prominent light
brownish gray (10YR 6/2) mottles; massive structure; very friable.
SHWT @ 128 inches (10YR 6/1)
SOIL/SITE EVALUATION • SOIL PHYSICAL ANALYSIS • LAND USE/SUBDIVISION PLANNING
GROUNDWATER DRAINAGE/MOUNDING • SURFACE/SUBSURFACE WASTE TREATMENT SYSTEMS. EVALUATION & DESIGN

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