SW3230803_Soils/Geotechnical Report_20240620

Hydrologic Soil Group—Union County, North Carolina
(19076 map)
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a Map Scale:1:5,550 if printed on A landscape(11"x 8.5")sheet.
N Meters
0 50 100 20) 300
Feet
0 250 500 1000 1500
Map projection:Web Mercator Corner coordinates:WGS84 Edge tics:UTM Zone 17N WCS84
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USDA Natural Resources Web Soil Survey
elm Conservation Service National Cooperative Soil Survey

Hydrologic Soil Group—Union County, North Carolina
(19076 map)
MAP LEGEND MAP INFORM,
Area of Interest(AOI) p C The soil surveys that comprise your AO
Area of Interest(AOI) 1:24,000.
® C/D
Soils ® D Warning:Soil Map may not be valid at t
Soil Rating Polygons
0 A p Not rated or not available Enlargement of maps beyond the scale
misunderstanding of the detail of mappi
n A/D Water Features line placement.The maps do not show
Streams and Canals contrasting soils that could have been s
n B scale.
Transportation
n B/D
++i. Rails Please rely on the bar scale on each m
C measurements.
ti Interstate Highways
n C/D US Routes Source of Map: Natural Resources Cc
n D Web Soil Survey URL:
Major Roads Coordinate System: Web Mercator(E
n Not rated or not available Local Roads
Maps from the Web Soil Survey are ba:
soil Rating Lines Background projection,which preserves direction ar
•-,., A distance and area.A projection that pre
II Aerial Photography Albers equal-area conic projection,sho
.;-. A/D accurate calculations of distance or are
.,i B This product is generated from the USE
.v B/D of the version date(s)listed below.
C Soil Survey Area: Union County, Nortl
Survey Area Data: Version 24,Sep 1;
.-.r C/D
Soil map units are labeled(as space all
D 1:50,000 or larger.
. . Not rated or not available Date(s)aerial images were photograph,
Soil Rating Points 9,2022
p A The orthophoto or other base map on N
compiled and digitized probably differs•
© A/D imagery displayed on these maps.As a
▪ B shifting of map unit boundaries may be
• B/D
USDA Natural Resources Web Soil Survey
Conservation Service National Cooperative Soil Survey

Hydrologic Soil Group—Union County,North Carolina 19076 map
Hydrologic Soil Group
Map unit symbol Map unit name Rating Acres in AOI Percent of AOI
BdB2 Badin channery silty C 11.6 36.4%
clay loam,2 to 8
percent slopes,
moderately eroded
BdC2 Badin channery silty C 0.4 1.3%
clay loam,8 to 15
percent slopes,
moderately eroded
CmB Cid channery silt loam, 1 D 1.7 5.2%
to 5 percent slopes
TbB2 Tarrus gravelly silty clay B 18.1 57.0%
loam,2 to 8 percent
slopes,moderately
eroded
Totals for Area of Interest 31.8 100.0%
USDA Natural Resources Web Soil Survey 6/19/2024
Conservation Service National Cooperative Soil Survey Page 3 of 4

Hydrologic Soil Group—Union County,North Carolina 19076 map
Description
Hydrologic soil groups are based on estimates of runoff potential. Soils are
assigned to one of four groups according to the rate of water infiltration when the
soils are not protected by vegetation, are thoroughly wet, and receive
precipitation from long-duration storms.
The soils in the United States are assigned to four groups (A, B, C, and D) and
three dual classes (A/D, B/D, and C/D). The groups are defined as follows:
Group A. Soils having a high infiltration rate (low runoff potential)when
thoroughly wet. These consist mainly of deep, well drained to excessively
drained sands or gravelly sands. These soils have a high rate of water
transmission.
Group B. Soils having a moderate infiltration rate when thoroughly wet. These
consist chiefly of moderately deep or deep, moderately well drained or well
drained soils that have moderately fine texture to moderately coarse texture.
These soils have a moderate rate of water transmission.
Group C. Soils having a slow infiltration rate when thoroughly wet. These consist
chiefly of soils having a layer that impedes the downward movement of water or
soils of moderately fine texture or fine texture. These soils have a slow rate of
water transmission.
Group D. Soils having a very slow infiltration rate (high runoff potential)when
thoroughly wet. These consist chiefly of clays that have a high shrink-swell
potential, soils that have a high water table, soils that have a claypan or clay
layer at or near the surface, and soils that are shallow over nearly impervious
material. These soils have a very slow rate of water transmission.
If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is
for drained areas and the second is for undrained areas. Only the soils that in
their natural condition are in group D are assigned to dual classes.
Rating Options
Aggregation Method: Dominant Condition
Component Percent Cutoff. None Specified
Tie-break Rule: Higher
USDA Natural Resources Web Soil Survey 6/19/2024
0111. Conservation Service National Cooperative Soil Survey Page 4 of 4