• EXHIBIT "AA"
<br />44
<br />SOIL SI3RVEY
<br />•
<br />to allow moisture accumulation. Generally p ecipitation is
<br />too low to make eneficial use of fertilizer.
<br />Stubble mule farming, stripcropping, d minimum til-
<br />lage are need to control soil blowing d water erosion.
<br />Terracing als may be needed to contr water erosion.
<br />The pot tial native vegetation is dominated by
<br />western w eatgrass and blue gram . Buffalograss is also
<br />present. otential production ran es from 1,000 pounds
<br />per acr in favorable years to 6 pounds in unfavorable
<br />years. s range condition dete ' rates, a blue grams-buf-
<br />falo ass sod forms. Undesir le weeds and annuals i -
<br />vad the site as range Condit' n becomes poorer.
<br />anagement of vegetatio on this soil should be b sed
<br />taking half and leaving alf of the total annual p oduc-
<br />ion. Range pitting can r ace runoff. Seeding is d sirable
<br />if the range is in poo condition. Western w atgrass,
<br />blue grams, sideoat grams, buffalograss, ubescent
<br />wheatgrass, and cres ed wheatgrass are suits a for seed-
<br />ing. The grass sele ed should meet the sea nil require-
<br />ments of livestoc It can be seeded int a clean, firm
<br />sorghum stubble or it can be drilled into firm prepared
<br />seedbed. Seedi early in spring has pro en most success-
<br />ful.
<br />Windbrea and environmental pl tings of trees and
<br />shrubs co only grown in the ar a are generally well
<br />suited t this soil. Cultivation o control competin
<br />vegetati n should be continued for as many yeazs s
<br />possib following planting. Tre s that are best suited nd
<br />have oad survival are Rock Mountain juniper, a tern
<br />red dar, ponderosa pine, Si Brian elm, Russian-oli a and
<br />h berry. The shrvbs bes suited are skunkbus
<br />1' ac, Siberian peashrvb, a d American plum.
<br />Wildlife is an import t secondary use oft ' soil. The
<br />cropland areas provid favorable habitat for 'ng-necked
<br />pheasant and mourni g dove. Many nonga species can
<br />be attracted by est fishing areas for Wes ng and escape
<br />cover. For pheasa ts, undisturbed Westin cover is essen-
<br />tial and should included in plans fo habitat develop-
<br />ment, especiall in aeeas of intensive griculture. Range-
<br />land wildlife, or example, the prong rn antelope, can be
<br />attracted b developing livestoc watering facilities,
<br />managing 1' estock grazing, and re eeding where needed.
<br />This so' has poor potential fo urban and recreatio 1
<br />develop ent. Slow permeabilit and high shrinks ell
<br />cause roblems in dwelling a road construction. pa-
<br />bility subclass IIIe irrigate IVe nonirrigated; ayey
<br />Plaifis range site.
<br />68-Ustic Torriorthents, moderately steep. These are
<br />deep, excessively drained soils on terrace breaks and
<br />escarpments at elevations of 9,450 to 5,100 feet. They
<br />formed in gravelly alluvium and have slopes of 9 to 25
<br />percent. Included in mapping are small areas of soils that
<br />have pockets of sandy loam and loam in the underlying
<br />material.
<br />Typically the surface layer is pale brawn gravelly sand
<br />about 10 inches thick. The underlying material to a depth
<br />of GO inches is pale brown gravelly sand.
<br />Permeability is rapid. Avails a water capacity is low.
<br />The effective rooting depth is 6 inches or more. Surface
<br />runoff is medium, and the erosion hazard is moderate.
<br />The potential native vegetation is dominated by little
<br />bluestem, sideoats grams, sandy reedgrass, blue grams,
<br />hairy grams, switchgrass, and needleandthread. Potential
<br />production ranges from 700 pounds per acre in favorable
<br />years to 200 pounds in unfavorable years. As range condi-
<br />tion deteriorates, the tall and mid grasses decrease, blue
<br />grams and hairy grams increas~, and forage production
<br />drops.
<br />Management of vegetation should be based on taking
<br />half or less of the total annual prjoduction. Deferred graz-
<br />ing is practical in improving tangle condition. Seeding and
<br />mechanical treatment aze impractical.
<br />Windbreaks and environmentalplantings generally are
<br />not suited to these soils. Onsite i vestigation is needed to
<br />determine if plantings are feasible.
<br />Wildlife populations are limited because the necessary
<br />habitat elements are lacking. Bec~use most of the acreage
<br />is rangeland, only rangeland wil~hfe, for example scaled
<br />quail and antelope, aze typical. E~(treme care is needed in
<br />managing livestock grazing in o , er to provide suitable
<br />habitat on these soils.
<br />Potential is poor for urban a recreational develop-
<br />ment. The chief limiting soil featu~es are the loose, coarse
<br />textured soil, steep slopes, and r' id permeability. Capa-
<br />bility subclass VIIs irrigated, VI's nonimgated; Gravel
<br />Breaks range site.
<br />69-Valent and, 0 to 3 perce ~, slopes. This is a deep,
<br />amed soil on plai #t elevations of 4,650
<br />It formed in a an~ deposits. Include
<br />z small areas of oils hat have lime wit ii
<br />inches.
<br />excessively
<br />sumac, 5,100 feet.
<br />~511y the surface
<br />thick. The under
<br />is brown sand.
<br />neability is r it
<br />de. The effe~t•iw
<br />Surface rvn ff is
<br />ayer is. brown sand out S
<br />ying material to a de h of 60
<br />Avails ]e water opacity is
<br />rooting ~epth is 0 inches or
<br />slow, and~the er ion hazard is
<br />This soil is suited to limiter
<br />cropping is h rdous because of
<br />system shoal be limited to such c
<br />falfa, wbea and bazley. The soi
<br />rigated pa tore. A suitable cropl
<br />years of Ifalfa followed by 2 y
<br />grain an alfalfa seeded with a
<br />Clos y spaced contour ditch o.
<br />in ' 'sting close grown crop . Co
<br />-ai{iping. Intensive
<br />on. The cropping
<br />grown crops as al-
<br />~o is suited to ir-
<br />system is 3 to 9
<br />of corn and sma}f
<br />e crop.
<br />sprinkers can be
<br />tour furrows or
<br />kler should be used for ne crop$. Applications bar-
<br />ny rd manure and comme ial fertilizer help to aintain
<br />g od production.
<br />The potential vege lion is dominated y sand
<br />bluestem, sand reed ss, switch ass, side is grams,
<br />needleandthread, littl bluestem, a d blue ama. Poten-
<br />tial production ran es from 2,500 pound per acre in
<br />favorable years to ,800 pounds in Unfav ble years. As
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