2006-12-12_REVISION - M1987028 ‎(2)‎

• Permit No: M1987028
• IBM Index Class Name: Revision
• Doc Date: 12/12/2006
• Doc Name: Conversion Appl
• From: Colorado Marble, L.L.C.
• To: DRMS
• Type & Sequence: CN1
• Media Type: D
• Archive: No

Northern San Isabel amf Western Pike National Forests. Cok:ratlo
MAP UNIT SETTINGS
Location: alpine areas where igneous an
metamorphic rocks predominate.
Landform: cirque bottoms.
Parent material: glacial till, co!luvium, and
alluvium.
Geologic symbol: Qa.
Elevation range: 11,600 to 13,000 feet.
Aspect: all.
Climatic zone: alpine.
Mean annual precipitation: 30 to 50 inches.
Mean annual air temperature: 34°F. to 38°F.
Average annual snow/all: 300 to 500 inches.
COMPOSITION
35 percent Moran and similar soils.
30 percent Rock outcrop.
20 percent Cryaquolls 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 surtace, near
timberline and on exposed convex slopes.
TYPICAL PROFILES:
Moran
Surface layer{s):
0 to 2 inches -dark grayish brown, gravelly
sandy loam.
2 to 10 inches -brown, gravelly sandy loam.
Subsoil layer(s):
10 to 20 inches -yellowish brown, very gravelly
sandy loam.
20 to 32 inches -light yellowish brown, very
cobbfy sandy loam.
Substratum layer(s):
32 to 60 inches -light olive bro.vn, very cobbfy
sandy loam.
Cryaquolls
Surface covering layer:
4 to 0 inches -dense mat of partly decomposed
vegetation.
Surface layer(s):
0 to 12 inches -black, sill !cam.
12 to 18 inches -black, very gravelly silt loam.
Substratum layer(s):
18 to 60 inches -dark greenish gray, very
gravelly sandy loam.
SOIL PROPERTIES AND QUALITIES
Moran
Effective rooting depth: greaser than 20 inches.
Drainage class: somewhat excessively.
Depth to seasonal high water table: greater
than 6 feet.
Available water caoacity: low.
PermeabUlty: moderately rapid.
Runoff: medium.
Rock outcrop
Landform: ice scoured bedrock, cliffs, and taws.
Parent material: residuum.
Rock type: igneous and metamorphic.
Runoff: rapid.
Cryaquolls
Effective rooting depth: greater than 40 inches
Drainage class: very poorly to somewhat poorly.
Depth to seasonal high water table: +t to 1
feet.
Available water capacity: low to moderate.
Permeability: slow to moderately slow.
Runoff: medium.
VEGETATION
PotenBal natural communities:
Moran: kobresia(golden avenscurly sedge
(Koury/Acro-Caro) and tufted hairgrass/golden
avens (DecelAcro) and (Sagl1-Sabr1lDece)
moist site.
Cryaquolls: grayteaf willow-willow/sedges
(Sagl1-BALI/CARE) stream drainages and
(Caaq/Gaul) seeps and bogs and BaRic
rush/sedges (Juan/CARE) bogs.
Seral stages: dominated by plants of the
respective potential natural communities.
Present vegetat/on: dominated by plants of the
respective potential natural communities.
USE AND MANAGEMENT CONSIDERATIONS
Major uses: recreation, scenic vistas, wiMlife
habitat, and watershed.
Mass movement potential:
Landslides: low.
Debris flows: low.
Snow avalanche: low.
Sediment delivery efficiency: high.
Road and trail limitations:
Cut and fill slope stability
Moran; slight.
Rock outcrop: slight- cliffs and talus.
Cryaquolls: severe- high water table.
Improved unsurfaced roads:
Moran: slight.
Rock outcrop: severe- cliffs and talus.
Cryaquolls: severe- high water table.
ONroad vehicle roads and trails;
Moran: severe- erosion hazard.
Rock outcrop: severe- cliffs and talus.
Cryaquolls: severe- high water table.
Foot trails and paths:
Moran: slight.
Rock outcrop: severe- cliffs and talus.
Crvaauolis: severe- hioh water table.