HomeMy WebLinkAbout20150257.tiff CENTENNIAL TOOL 8c SERVICE
LOCATED IN THE SOUTHEAST QUARTER OF SECTION 10
TOWNSHIP 4 NORTH , RANGE 64 WEST OF THE 6TH P . M .
COUNTY OF WELD , STATE OF COLORADO
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SITE IS COMPOSED ENTIRELY OF NUNN CLAY LOAM AT
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FARMLAND IF IRRIGATED. HYDROLOGIC SOIL RATING OF C -
c SOILS HAVING SLOW INFILTRATION RATE WHEN THOROUGHLY J'R ENGINEERING
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AASHTO Group Classification (Surface)—Weld County, Colorado, Southern Part
AASHTO Group Classification (Surface)
AASHTO Group Classification (Surface)— Summary by Map Unit — Weld County, Colorado, Southern Part (CO618)
Map unit symbol Map unit name Rating Acres in AOI Percent of AOI
4 Aquolls and Aquepts, 0.0 0.0%
flooded
19 Colombo clay loam, 0 to A-6 45.6 27.9%
1 percent slopes
41 Nunn clay loam, 0 to 1 A-6 81.1 49.7%
percent slopes
72 Vona loamy sand, 0 to 3 A-2 36.2 22.2%
percent slopes
73 Vona loamy sand, 3 to 5 A-2 0.3 0.2%
percent slopes
Totals for Area of Interest 163.11 100.0%
Description
AASHTO group classification is a system that classifies soils specifically for
geotechnical engineering purposes that are related to highway and airfield
construction. It is based on particle-size distribution and Atterberg limits, such as
liquid limit and plasticity index. This classification system is covered in AASHTO
Standard No. M 145-82. The classification is based on that portion of the soil that
is smaller than 3 inches in diameter.
The AASHTO classification system has two general classifications: (i) granular
materials having 35 percent or less, by weight, particles smaller than 0.074 mm in
diameter and (ii) silt-clay materials having more than 35 percent, by weight,
particles smaller than 0.074 mm in diameter. These two divisions are further
subdivided into seven main group classifications, plus eight subgroups, for a total
of fifteen for mineral soils. Another class for organic soils is used.
For each soil horizon in the database one or more AASHTO Group Classifications
may be listed. One is marked as the representative or most commonly occurring.
The representative classification is shown here for the surface layer of the soil.
Rating Options
Aggregation Method: Dominant Condition
Component Percent Cutoff: None Specified
Tie-break Rule: Lower
Layer Options (Horizon Aggregation Method): Surface Layer (Not applicable)
USDA Natural Resources Web Soil Survey 8/1 /2014
Conservation Service National Cooperative Soil Survey Page 3 of 3
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Hydrologic Soil Group—Weld County, Colorado, Southern Part
Hydrologic Soil Group
Hydrologic Soil Group— Summary by Map Unit — Weld County, Colorado, Southern Part (CO618)
Map unit symbol Map unit name Rating Acres in AOI Percent of AOI
4 Aquolls and Aquepts, D 0.0 0.0%
flooded
19 Colombo day loam, 0 to B 45.6 27.9%
1 percent slopes
41 Nunn clay loam, 0 to 1 C 81.1 49.7%
percent slopes
72 Vona loamy sand, 0 to 3 B 36.2 22.2%
percent slopes
73 Vona loamy sand, 3 to 5 B 0.3 0.2%
percent slopes
Totals for Area of Interest 163.1 100.0%
USDA Natural Resources Web Soil Survey 8/1/2014
a Conservation Service National Cooperative Soil Survey Page 3 of 4
Hydrologic Soil Group—Weld County, Colorado, Southern Part
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 (ND, 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 8/1 /2014
a Conservation Service National Cooperative Soil Survey Page 4 of 4
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Farmland Classification—Weld County, Colorado, Southern Part
Farmland Classification
Farmland Classification— Summary by Map Unit — Weld County, Colorado, Southern Part (CO618)
Map unit symbol Map unit name Rating Acres in AOI Percent of AOI
4 Aquolls and Aquepts, Prime farmland if drained 0.0 0,0%
flooded and either protected
from flooding or not
frequently flooded
during the growing
season
19 Colombo clay loam, 0 to Prime farmland if 45.6 27.9%
1 percent slopes irrigated
41 Nunn clay loam, 0 to 1 Prime farmland if 81.1 49.7%
percent slopes irrigated
72 Vona loamy sand, 0 to 3 Farmland of local 36.2 22.2%
percent slopes importance
73 Vona loamy sand, 3 to 5 Not prime farmland 0.3 0.2%
percent slopes
Totals for Area of Interest 163.1 100.0%
Description
Farmland classification identifies map units as prime farmland, farmland of
statewide importance, farmland of local importance, or unique farmland. It identifies
the location and extent of the soils that are best suited to food , feed, fiber, forage,
and oilseed crops. NRCS policy and procedures on prime and unique farmlands
are published in the "Federal Register," Vol. 43, No. 21 , January 31 , 1978.
Rating Options
Aggregation Method: No Aggregation Necessary
Tie-break Rule: Lower
USDA Natural Resources Web Soil Survey 8/1 /2014
Conservation Service National Cooperative Soil Survey Page 4 of 4
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