REV96933

• Permit No: M1991009
• IBM Index Class Name: Revision
• Doc Name: VEGETATION SOIL & RECLAMATION INVENTORY & EVALUATION
• Type & Sequence: SO1
• Media Type: D
• Archive: No

I NVEN T O RY 8c EVALUATION
Requested By: White River Sand & Gravel Date: January 18, 1991
• by: Benny Jensen
Assisted Bp: Alvin L. Jones Location: SE1J9, Sec. 24,
District Conservationist T1N, R94W, 6th P.M.
SITUATION: You requested an inventory of existing soil and
vegetation, and reclamation recommendations for a planned 3 to 5
acre gravel pit located in SE 1/4, Section 24, T1N, R94W,
immediately south of Rio Blanco County Road 8.
INFORMATION PROVIDED: The following information is based upon an
inventory and evaluation of the proposed site on January 23,
1991. Due to the time of year this information was requested and
with the present snow cover, very limited information could be
gathered during the on-site evaluation. Information and data
presented in this report will be primarily based upon published
range site and soil descriptions for this site.
Part of this site has previously been disturbed during
excavation for gravel. The disturbed portion of the site has
never been reclaimed form earlier work.
1) SOILS - The typical soil (soil mapping unit 11) found on this
site is the Borollic Calciorthids-Guben complex, 6 to 50 percent
slopes. The majority of this proposed gravel pit will likely be
located on the Borollic Calciorthids portion of the complex.
Typically the surface layer of Borollic Calciorthids soil is a
• gravelly or cobbly loam, clay loam, or sandy loam 2 to 5 inches
thick. The underlying material to a depth of 20 to 60 inches or
more ranges from a very gravelly sandy loam or cobbly sandy loam
to very gravelly loamy sand or cobbly loamy sand. Calcium
carbonate content is more than 15 percent. This is a well
drained soil, derived from calcareous alluvial and glacial
outwash material. The permeability of this soil is moderately
rapid to rapid and the available water holding capacity is low.
Surface runoff is medium to rapid and the hazard of erosion is
moderate to high.
The Guben portion of this complex has eolian deposited
material over glacial or alluvial material. The surface layer is
a loam 6 inches thick. The next layer is a loam 5 inches thick.
The upper 4 inches of the underlying material is a gravelly loam,
with the next S inches a very gravelly loam, and the remaining
part to a depth of 60 inches or more is stratified very cobbly
sandy loam containing more than 15 percent calcium carbonate.
Permeability is moderate, with the available water holding
capacity low to moderate. Runoff is medium and the hazard of
water erosion is slight to high depending upon slope steepness.
Any topsoil which exists on this site should be saved and
stockpiled, to be used during reclamation.
2) VEGETATION - Existing vegetation on the proposed disturbed
portion of the site is very limited due to the previous
disturbances. However this pit location is found within the
• Stony Foothills and Rolling Loam Range Sites. Range condition of
the site is generally fair on the undisturbed portion. The
dominate brush specie apparent on the site was big sagebrush.
Sagebrush is estimated to comprise approximately 35 percent of
the annual production of the site. Understory species which are