SW4240401_Soils/Geotechnical Report_20240605

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PIEDMONT
ENVIRONMENTAL
ASSOCIATES , P . A .
4/3/2024 Project # 5364
Keystone Group Inc
c/o: Scott Wallace
3708 Alliance Dr
Greensboro, NC 27407
This report details the findings of a seasonally high-water table evaluation at
Old Hollow Road, Whitehall Village South, Walkertown, North Carolina.
Your office gave the location of the proposed storm water control
measure(s) (SCM). James L. Beeson, Licensed Soil Scientist #1114,
conducted the evaluation. The results were as follows:
Seasonally High-Water Table Soil Borings
Soil borings were conducted within the proposed devices on the attached
map, and the depth to the seasonally high-water table (SHWT) was
determined by observing soil indicators, also known as redoximorphic
features. The elevations of the surface were taken from the map you
provided.
Findings:
Soil boring locations are shown on the attached map.
Boring ID SHWT SHWT Northing Easting
Depth Elevation
(inches) (feet)
1 >10ft Below 973 ft 881,778.41N 1,661,954.28E
2 60 in 966.5 ft 881,515.20N 1,662,850.03E
3 44 in 969.8 ft 881,621.68N 1,662,850.38E
Conclusion: This determination is called a Seasonally High-Water Table
determination which is very misleading. The term "table" suggests that the
elevation of the saturated zone is flat. In the piedmont of North Carolina this
is not correct. We are finding depth to layers that show evidence of
216 S. Swing Rd., Suite 1 Greensboro, NC 27409 336-662-5487

significant periods of saturation. Device #1 shows no evidence of saturation
to a depth greater than 10 feet. Device #2 is in a different soil type that has
an expansive clay layer that can trap and hold water and is therefore
recognized as the seasonally high-water table elevation. The reason for the
difference in elevation within device #2 is that the expansive clay is
shallower at boring #3 than at boring #2. This is due primarily to the
deposition of a sandy surface above the clay layer. Device #2 will have to
observe the saturated zone at 969.8 ft or take measures to allow for an
installation into the saturated zone.
Piedmont Environmental Associates, PA is pleased to perform this work for
you. If you have any questions, please feel free to call 336-215-8820.
Sincerely,
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James L. Beeson
N.C. Licensed Soil Scientist #1114

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Keystone SHWT determination
PIEDMONT
Job#5364
ENVIRONMENTAL 216 S. Swing Rd. Suite 1
ASSOCIATES P A - Greensboro, NC 27409 Date: 4/3/2024
piedmontsoil.com Client: Keystone Group Inc"
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