2005-10-24_REVISION - M1987028

• Permit No: M1987028
• IBM Index Class Name: Revision
• Doc Date: 10/24/2005
• Doc Name: Conv. Appl.
• From: Colorado Marble L.L.C.
• To: DMG
• Type & Sequence: CN1
• Media Type: D
• Archive: No

Narthem San tsabet and Western Price Nstiortat Forests. Crnhrado
MAP UNIT SETTINGS
Location: alpine areas where igneous an
metamorphic rocks predominate.
Landform: cirque ~ttoms.
Parent material: glacial till, colluvium, and
alluvium.
Geologic symbol: Qa.
Elevation range: 11,600 to 13,000 feet.
Aspect: all.
Climatic zone: alpine.
Mean annual pracFpltatlon: 30 to 50 inches.
Mean annual air temperature: 34°F. to 38°F.
Average annual snowfall: 300 to 500 inches.
COMPOSITION
35 percent Moran and similar soils.
30 percent Rock outcrop.
20 percent Cryaquolts and similar soils.
Contrasting inclusions
10 percent shallow soils with a dark surface on
ice scoured convex slopes.
5 percent soils that lack a dark surface, near
timberline antl on exposed convex slopes.
TYPICAL PROFILES:
Moran
Surface layer{s):
0 to 2 inches -dark grayish brown, gravelly
sandy barn.
2 to 10 inches -brown, gravely sandy loam.
Subsoil layer(s):
10 to 20 inches - yelowish brown, very gravelly
sandy loam.
20 to 3? inches - light yellowish brawn, very
cobbly sandy loam.
Substratum layer(s):
32 to 60 inches -tight olive brown, very cobbty
sandy foam.
Cryaquolis
Surface covering layer:
4 to 0 inches -dense mat of partty decomposed
vegetation.
Surface layer(s}:
0 to 12 inches -black, silt barn.
12 Tfl 18 inches -black, very gravelly siR loam.
Substratum layer(s):
18 to 60 inches -dark greenish gray, very
gravelly sandy loam.
SOIL PROPERTIES AND QUALRIES
Moran
Effective rooting depth: greater than 20 inches.
Drainage class: somewhat excessively.
Depth to seasonal high water table: greater
than 6 feet.
Available water caaacltr low.
Permeability.• moderately rapid.
Runoff: medium.
Rock outcrop
Landlorm: ice scoured bedrock, tiffs, and talus.
Parent material: residuum.
Rock type: igneous and metamorphic.
Runoff.• rapid.
Cryaquolla
Effective rooting depth: greater than 40 inches.
Drainage class: very poorly to somewhat poorly.
Depth to seasona- high water table: +1 to 1
feet
Available water capacity: low to moderate.
Permeability: slow to moderately slow.
Runoff.' medium.
YEGETATtON
Potential natural communities:
Moran: kobresiaigolden evens-curly sedge
(Koury/Acro-Caro) and tufted hairgrass/gokien
evens (DeceJAcro) and {Sag11-Sabr1/Dece)
moist site.
Cryaquotts: grayteaf wrtlow-willow/sedges
(Sag11SALIJCARE) stream drainages and
{CaaglCaut) seeps and bogs and Baltic
rush/sedges (JuariGAREj bogs.
Seral stages: dominated by plants of the
respective potential natural commundies.
Present vegetation: dominated by plants of the
respective potential natural communities.
USE AND MANAGEMENT CONSIDERATIONS
Major uses: recreation, scenic vistas, wildlife
habitat, and watershed.
Mass mavament potential:
Landslides: kra.
Debris flows: low.
Snow avalanche: tow.
Sediment depvery efffclency: high.
Road and trail limitations:
Cut and frft slope stablflty
Moran: slight
Rock outcrop: slight-cliffs and talus.
Cryaquolls: severe- high water table.
Improved unsurfaeed roads:
Moran: slight.
Rock outcrop: severe- cliffs and talus.
Cryaquotls: severe- high water table.
Of/road vehicle roads and traJ)s:
Moran: severe- erosion hazard.
Rock outcrop: severe- Jiffs and talus.
Cryaquolis: severe- high water table.
Foot halls and paths:
Moran: slight
Rock outcrop: severe- cliffs and talus.
Crvaauotk: severe- high water table.