PERMFILE62688

• Permit No: C1981024
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: EXHIBIT 3 SOILS INFORMATION
• Media Type: D
• Archive: No

•
SOIL MAPPING UNIT - OLNEY SANDY LOAM
21F - Olney sandy loam, 3 to 12 percent slopes. This deep, well drained
soil is on uplands. It formed in calcareous eolian material. The
native vegetation is mainly grass. Elevation is 5,500 to 6,900 feet.
The average annual precipitation is 13 to 15 inches, the average annual
air temperature is 49 to 54 degrees F., and the average front-free
period is 125 to 160 days.
Typically, the surface layer is brown sandy loam about 4 inches thick.
The subsoil is mainly sandy clay loam about 14 inches thick. The
substratum to a depth of 60 inches or more is fine sandy loam. The soil
is neutral to a depth of 13 inches and moderately alkaline below that
depth.
Included in this unit is about 10 percent Fort Collins loam in swales.
Also incluied are small areas of Otero sandy loam oa low ridges.
• Permeability of this Olney soil is moderate. Available water capacity
is moderate. Effective rooting depth is 60 inches or more. Runoff is
medium to rapid, and the hazard of water erosion is high to very high.
The hazard of soil bloving is high.
Most areas of this unit are used for rangeland. A few areas are used
for nonirrigated and irrigated cropland. Hay and pasture are the main
irrigated trope. Wheat is the main nonirrigated crop. Areas of
nonirrigated cropland 'aze highly susceptible to water erosion and soil
blowing and generally should be reseeded to grass.
The potential plant community on this unit is mainly blue grams,
sideoats grams, and western wheatgrass. Other less numerous grasses
that characterize this site are Indian ricegrass and sand dropseed. The
average annual production of air-dry vegetation is
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