SW6191201_SHWT Determination_20200210

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Adams Soil Consulting
1676 Mitchell Road
Angier, NC 27501
919-414-6761
Enoch Engineering, P.A.
1403 NC 50 South
Benson, NC 27504
February 5, 2020
Project #865
RE: Seasonal high-water table (SHWT) determination for proposed stormwater devices
(BMP) for Lynn Ridge Development adjacent to Lipscomb Road in Angier, NC
Mr. Temple;
Adams Soil Consulting (ASC) performed a site evaluation per your request on the above
referenced location. The purpose of the evaluation was to determine the depth to the seasonal high-
water table for a stormwater devices (swales). Two locations were evaluated at each proposed
swale location. A SHWT determination was made for the upper (higher elevation) portion of the
Swale and one for the end (lower elevation) portion of the swale.
The seasonal high-water table determination was made using soil indicators taken from profile
descriptions made at the site. The soil profile descriptions were made from hand auger borings.
The soil was most similar to the "Norfolk" soil series transitioning to the "Bibb" series in the
wetland areas. The Norfolk series is well drained soil found in the Coastal Plain region of North
Carolina. The clay mineralogy found in the subsoil was not considered to be expansive in nature
and or was considered to have a relatively low shrink/swell potential.
The seasonal high-water table determinations are summarized in the table below.
Swale Location
SHWT Depth
below soil
surface
(inches)
Lot 4/5 -high end
44
Lot 4/5 - low end
32
Lot 8/9 - high end
38
Lot 8/9 - low end
20
Lot 11/12 -high end
44
Lot 11/12 - low end
16
Lot 14/154 -high
end
46
Lot 14/15 - low end
20
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Lot 16/175 -high
end
35
Lot 16/17 - low end
15
Lot 19/20 -high end
34
Lot 19/20. - low end
24
Lot 22/23 -high end
34
Lot 22/233 - low
end
24
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2. 7, D
It should be noted that the seasonal high-water table determinations were made based on observed
soil indicators and were not measured or monitored. The actual water table may vary from soil
indicators. This report represents the professional opinion of the evaluating scientist of the seasonal
high-water table depth for design purposes.
If you have any questions or concerns, please contact me at your earliest convenience.
Sincerely,
�%�
Alex Adams
NC Licensed Soil Scientist #1247