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RECIE9VE®
<br />EXHIBIT I ocr ~ 7 2002
<br />SOILS tNFORMATtON
<br />R. 79 W. R. 78 W.
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<br />Division of Minerals and Geology
<br />The ]1~;,,:r~nn .:ic= nm.'i<t of fvua;~trlt cticcs-
<br />:icely dr.:i:ud roil~~on irrr:u•es ::nd terr;lee rciges. Tiie__=e
<br />soils are eery shatlnty over cobbles, gravcf, and sand.
<br />They fornted in gravelly, moderately coarse textured
<br />ouftvash. Slopes range from 1 to 95 percent. Elevation
<br />ranbes from 7,200 to 5,800 feet. The plant cover is
<br />mainly short and mid grasses, but there is an overstory
<br />of pinyon pine and juniper on some of the steeper
<br />slopes. The average annual precipitation is 11 to 16
<br />inches. The average annual soil temperature is 46° F.,
<br />and the average soil temperature in summer is G4 °.
<br />The frost-free season is 75 to 100 days.
<br />In a representative profile the surface layer is dark-
<br />brown gravelly sandy loam about 6 inches thick. The
<br />next layer is dark-brown very gravelly sandy loam
<br />about 5 inches thick. Below this is mixed gravel and
<br />cobbles that exfend to a depth of GO inches or more.
<br />The soil is neutral in the uppermost 3 inches and mildly
<br />o alkaline below that depth.
<br />Permeability in-these -soils is very rapid, and the
<br />available water capacity is ]ow. Effective rooting depth
<br />is 60 inches or more.
<br />3fost areas of the Dominson soils are in range and
<br />----~. are used for grazing (fig. ?). A smaIf acreage is used
<br />_"--• for irrigated hay.
<br />Representative profile of Dominson gravelly sandy
<br />~i loam, 1 to 9 percent slopes, in native range near the
<br />', center of SWl/; sec. 16, T. 16 S., R. 78 W., Chaffee
<br />County:
<br />' All-0 to 9 inches brown (SOYR 6/3) grave])y sandy
<br />thi
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<br />rown (lOYR 3B) moist; wea
<br />- ~ loam; dark
<br />~ platy atruetwe parting to vreak, 8ne, granular;
<br />. 52
<br />_
<br />slightly hard, very friable, nonsticky; many fine 25
<br />and medium roots; ]b percent gravel and cobbles:
<br />neutral; dear. smooth boundary. ::
<br />=_~_~
<br />AI2-3 to 6 inches, brown (lOYR b/3) gravelly sandy loam; o
<br />dark brown (lOYR 3/8) moist; weak, medium, sub
<br />angular blocky structure; slightly hard, friable.
<br />nonsticky; many fine and medium roots; 15 percent
<br />gravel and cobbles; mildly alkaline; clear, wavy
<br />d
<br />boun
<br />ary.
<br />cce_ - pC-6 to it inches, dark-brown (IOYR 4/3) very gravelly
<br />sandy foam; dark brown (IOYR 3/a) moist; weak,
<br />- -- ~ ~ _ medium, subany~ltar blocky structure; slightly hard.
<br />- - friable, nonsticky; common fine and medium roots;
<br />-~'""~ '~, ~ b0 percent gravel and Cobbles; mildly alkaline:
<br />gradual, ccavy baundarq.
<br />IIC-11 to 60 inches. mixed igneous cobbles. Gravel, and sand:
<br />~
<br />lime coatings in places on underside of large gravel.
<br />i
<br />The A horizon generally ranges from 6 to 8 inches in
<br />thickness, but where there is no AC horizon, the A horizon
<br />is 7 to 15 inches thick. This horizon is very dank 6row-n or
<br />dark brown. Gravel and cobbles cover 5 to 25 percent of the
<br />soil surface. Reaction ranges from 6.6 to 7.8. Depth to the
<br />IIC horizon ranges from 8 to 16 inches.
<br />Dominson gravelly sandy loam, 1 to 9 percent slopes
<br />(DoD).-This soil is on alluvial fans and high terraces in
<br />nearly all parts of Chaffee County. It has the profile
<br />described as representative of the series. Included with
<br />this soil in mapping are small areas of St. Elmo
<br />gravelly sandy loam. 1 to 3 percent slopes.
<br />....
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<br />Surface runoff is medium, and the hazard of erosion
<br />is moderate. About 80 percent of the acreage is in
<br />range that is used for grazing. The remaining 20 per-
<br />cent is in irrigated hay, mainly alfalfa. Most of the
<br />__ ...:..., ;s in areas where sluvc3 ar:. ~ to 5 per"-ent.
<br />; b......... _
<br />(Capability unii'vie-i, irrigated, :rI2-.'., ncnirrigate~;
<br />Drr Mountain Outwash range site)
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