2005-07-13_REVISION - M2000016 ‎(34)‎

• Permit No: M2000016
• IBM Index Class Name: Revision
• Doc Date: 7/13/2005
• Doc Name: exhibit i soils information
• From: lafarge
• To: dmg
• Type & Sequence: AM1
• Media Type: D
• Archive: No

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JUL 13 2005 ~
Dieisiaa a. 6;;ioarals ~ Deolagy

EXHIBIT I ~
Soils Information ,/
Excerpts from the Soil Survey of Weld County, Southern Part (SCS, 1980) are provided in
this Exhibit. Most of the soils in the proposed areas are aquolls, aquents, and bankard
sandy loam that commonly occur on bottomlands, floodplains, and natural drainageways.
These are generally deep, poorly drained soils that formed in recent alluvium.
These soils are primarily suited for pasture, rangeland, and wildlife habitat. They are well
suited to reestablishment of grasses as proposed in the Reclamation Plan. If recommended
by SCS, soil samples will be subjected to agricultural testing to evaluate fertilizer
requirements.
The affected lands within the permit area contain many types of soils. The U.S. Department
of Agriculture Soil Conservation Service delineates the extents of, and characterizes each
soil type in a soil survey. The Soils Map, enclosed at the end of this Exhibit, illustrates
where these soils are present within the permit area. The following are descriptions of the
soils found in the area. '
3 - Aquolls and Aquents, gravelly substratum
This neazly level map unit is on bottomlands and floodplains of all the major streams in the
survey area. Aquolls, which have a dark colored surface layer, make up about 60 percent of
the unit. Aquents, which have a lighter colored surface layer, make up about 35 percent.
About 5 percent is Aquepts and Bankard sandy loam.
These are deep, poorly drained soils that formed in recent alluvium. No one pedon is
typical. Commonly the soils have a mottled, mildly alkaline to moderately alkaline loamy
or clayey surface layer and underlying material and are underlain by sand or sand and
gravel within 48 inches. In places they have a gleyed layer in the underlying material.
Most of the acreage is subject to flooding. The water table is at or near the surface early in
spring and recedes to as deep as 48 inches late in fall in some years.
These soils are used for rangeland and wildlife habitat. Some small azea have been
reclaimed by major drainage and leveling and are used for irrigated crops.
The potential native vegetation is dominated by alkali sacaton, switchgrass, and westem
wheatgrass. saltgrass, sedge, rush and alkali bluegrass are also prominent. Potential
production ranges from 3000 pounds per acre in favorable years to 2000 pounds in
unfavorable years. As range condition deteriorates, the switchgrass, alkali sacaton, and
western wheatgrass decrease and saltgrass, sedge and rush increase.
Management of vegetation should be based on taking half and leaving half of the total
annual production. Seeding is difficult and costly because numerous tillage practices are
required to eliminate the saltgrass sod. switchgrass, western wheatgrass, alkali sacaton, tall
OMG ll1 Permit
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