20180399 Ver 1 - ST_Appendix_I_HSG - 3/20/2018

Hydrologic Soil Group—Wake County, North Carolina
(8001 ACC Boulevard)
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
6/6/2017
Page 1 of 43977210397723039772503977270397729039773103977330397735039773703977390397741039772103977230397725039772703977290397731039773303977350397737039773903977410699890699910699930699950699970699990700010700030
699890 699910 699930 699950 699970 699990 700010 700030
35° 55' 14'' N 78° 47' 4'' W35° 55' 14'' N78° 46' 58'' W35° 55' 7'' N
78° 47' 4'' W35° 55' 7'' N
78° 46' 58'' WN
Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 17N WGS84
0 45 90 180 270
Feet
0 15 30 60 90
Meters
Map Scale: 1:1,020 if printed on A portrait (8.5" x 11") sheet.
Soil Map may not be valid at this scale.
MAP LEGEND MAP INFORMATION
Area of Interest (AOI)
Area of Interest (AOI)
Soils
Soil Rating Polygons
A
A/D
B
B/D
C
C/D
D
Not rated or not available
Soil Rating Lines
A
A/D
B
B/D
C
C/D
D
Not rated or not available
Soil Rating Points
A
A/D
B
B/D
C
C/D
D
Not rated or not available
Water Features
Streams and Canals
Transportation
Rails
Interstate Highways
US Routes
Major Roads
Local Roads
Background
Aerial Photography
The soil surveys that comprise your AOI were mapped at
1:15,800.
Warning: Soil Map may not be valid at this scale.
Enlargement of maps beyond the scale of mapping can cause
misunderstanding of the detail of mapping and accuracy of soil
line placement. The maps do not show the small areas of
contrasting soils that could have been shown at a more detailed
scale.
Please rely on the bar scale on each map sheet for map
measurements.
Source of Map: Natural Resources Conservation Service
Web Soil Survey URL:
Coordinate System: Web Mercator (EPSG:3857)
Maps from the Web Soil Survey are based on the Web Mercator
projection, which preserves direction and shape but distorts
distance and area. A projection that preserves area, such as the
Albers equal-area conic projection, should be used if more
accurate calculations of distance or area are required.
This product is generated from the USDA-NRCS certified data as
of the version date(s) listed below.
Soil Survey Area: Wake County, North Carolina
Survey Area Data: Version 15, Sep 19, 2016
Soil map units are labeled (as space allows) for map scales
1:50,000 or larger.
Date(s) aerial images were photographed: Apr 27, 2014—May
6, 2014
The orthophoto or other base map on which the soil lines were
compiled and digitized probably differs from the background
imagery displayed on these maps. As a result, some minor
shifting of map unit boundaries may be evident.
Hydrologic Soil Group—Wake County, North Carolina
(8001 ACC Boulevard)
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
6/6/2017
Page 2 of 4
Hydrologic Soil Group
Hydrologic Soil Group— Summary by Map Unit — Wake County, North Carolina (NC183)
Map unit symbol Map unit name Rating Acres in AOI Percent of AOI
CmA Chewacla sandy loam, 0
to 2 percent slopes,
frequently flooded
B/D 1.1 25.5%
CrB Creedmoor sandy loam,
2 to 6 percent slopes
D 0.9 19.9%
CrC Creedmoor sandy loam,
6 to 10 percent slopes
D 1.6 36.6%
CrC2 Creedmoor sandy loam,
6 to 10 percent
slopes, moderately
eroded
D 0.8 18.0%
Totals for Area of Interest 4.4 100.0%
Hydrologic Soil Group—Wake County, North Carolina 8001 ACC Boulevard
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
6/6/2017
Page 3 of 4
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
Hydrologic Soil Group—Wake County, North Carolina 8001 ACC Boulevard
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
6/6/2017
Page 4 of 4