2008-03-03_PERMIT FILE - C2006085 ‎(13)‎

• Permit No: C2006085
• IBM Index Class Name: Permit File
• Doc Date: 3/3/2008
• Doc Name: NRCS Soil Descriptions
• Section_Exhibit Name: Exhibit I
• Media Type: D
• Archive: No

•
38
about 4 inches thick. The upper part of the subsoil is
mainly clay loam about 17 inches thick. The lower part
of the subsoil and the substratum to a depth of 60
inches or more are loam. The soil is neutral to a depth
of 4 inches. It is mildly alkaline to a depth of 16 inches
and is moderately alkaline below that depth.
Permeability is moderate. Available water capacity is
high. Effective rooting depth is 60 inches or more.
Runoff is slow to rapid, and the hazard of water erosion
is slight to high.
This soil is used as rangeland. A few small areas
were formerly used as cropland but are now planted to
grass.
The potential plant community is mainly western
wheatgrass, blue grama, needleandthread, and little
bluestem. The average annual production of air-dry
vegetation is about 1,100 pounds per acre. If the
condition of the range deteriorates, blue grama, red
threeawn, pricklypear, and broom snakeweed increase
This soil is well suited to homesite development.
The capability classification is IVe, nonirrigated. The
soil is in the Loamy Foothill #202 range site.
37-Fort Collins Variant loam, 3 to 8 percent
slopes. This deep, well drained soil is on fan terraces.
It formed in alluvium. Theknative_.vegetation is mainly
grasses. Elevation is 7,000 to 7;400 feet. The average
annual precipitation is 12 to 14 inches, the average
annual air temperature is 44 to 47 degrees F, and the
average frost-free period is 100 to 120 days.
The surface layer is typically brown loam about 4
inches thick. The upper 5 inches of the subsoil is clay
loam. The lower part of the subsoil to a depth of 60
inches or more is loam. The soil is neutral to a depth of
9 inches and is moderately alkaline below that depth.
Included with this soil in mapping are areas of Jodero
soils in narrow drainageways. These soils have a
surface layer of sandy loam. They make up about 5
percent of the unit.
Permeability is moderate in the Fort Collins Variant.
Available water capacity is high. Effective rooting depth
is 60 inches or more. Runoff is medium or rapid, and
the hazard of water erosion is moderate or high.
This soil is used as rangeland.
The potential plant community is mainly western
wheatgrass, blue grama, needleandthread, and prairie
junegrass. The average annual production of air-dry
vegetation is about 1,200 pounds per acre. If the
condition of the range deteriorates, blue grama, red
threeawn, and annual forbs increase. Range seeding is
suitable if the range is in poor condition.
This soil is well suited to homesite development.
The capability classification is IVe, nonirrigated. The
soil is in the Loamy Foothill #202 range site.

Soil Survey
38--Granite very gravelly sandy loam, 4 to 25
percent slopes. This deep, well drained soil is on
mountainsides. It formed in colluvium and residuum
derived dominantly from granodiorite. The native
vegetation is mainly conifers. Elevation is 8,500 to
10,500 feet. The average annual precipitation is 16 to
20 inches, the average annual air temperature is 38 to
42 degrees F, and the average frost-free period is 45 to
65 days.
The surface is typically covered with a mat of
needles and twigs about 2 inches thick. The surface
layer is light brownish gray very gravelly sandy loam
about 10 inches thick. The upper 12 inches of the
subsoil is mainly extremely gravelly sandy clay loam,
and the lower 30 inches is extremely gravelly coarse
sandy loam. The substratum to a depth of 60 inches or
more is extremely gravelly loamy coarse sand. The soil
is neutral to a depth of 22 inches and is slightly acid
below that depth.
Included with this soil in mapping are areas of
Adderton soils along drainageways. These soils make
up about 10 percent of the unit. They have a low
content of gravel and have a thick, dark surface layer of
loam. Also included are areas of Gulley soils in the
steeper areas. These soils are moderately deep. They
make up about 5 percent of the unit.
Permeability is moderate in the Granite soil. Available
water capacity is low. Effective rooting depth is 60
inches or more. Runoff is slow to rapid, and the hazard
of water erosion is slight to high.
This soil is used as woodland, for wildlife habitat, or
for summer livestock grazing.
The potential plant community is mainly Douglas-fir
and white fir and an understory of common juniper,
sedges, kinnikinnick, nodding bromegrass, and other
forbs and grasses. The potential production of
understory vegetation in normal years is about 100
pounds per acre. The overstory is dominantly
Engelmann spruce in a few small areas at the higher
elevations.
This soil is suited to production of Douglas-fir and
white fir. Conventional methods for harvesting timber
can be used. Based on a site index of 55, the potential
production per acre of merchantable timber is 2,000
cubic feet or 7,800 board feet (International rule,'/e-inch
kerf) from an even-aged, fully.stocked stand of trees
100 years old.
Minimizing the risk of erosion is essential when
timber is harvested. Properly designing road drainage
systems and carefully placing culverts help to control
erosion. Spoil from excavations is subject to rill and
gully erosion and to sloughing. Leaving organic litter on
the surface helps to maintain a high rate of water
infiltration, control runoff, and maintain an adequate