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

Ncrthern San 15age1 and Western Pike NaHOnaf Forests, Colorada
below 11,000 feet and subalpine fir-Engeimann
spruce/grouse whortleberry (Abla-Pien1Nasc)
above 11,000 feet
Se21 stages: dominated by plants of the
respective potential natural communities.
Present vegetation: dominated by plants of the
respective potential, natural communities.
USE AND MANAGEMENT CONSIDERATIONS
Major uses: homesites, timber harvest, firewood
harvest, limited livestock grazing, wildlife habitat,
and watershed.
Mass movement potential:
Landslides: low.
Debris flows: low.
Snow avalanche: low.
Sediment delivery effrciency: low.
Road and ira/1 !lmitatlons:
Cut and fill slope stability
Howardsville: slight.
Improved unsurfaced roads:
Howardsville: slight.
Oflraad vehicle roads and trails:
Howardsville: moderate- cobbles, stones, and
boulders.
Foot trails and paths:
Howardsville: slight.
Revegetatfan considerations: Mulch or similar
treatment will protect the soil from erosion, help
conserve soil moisture, and protect emerging
plant seedlings. Fertilizer will supplement low
inherent fertility.
Timber managementconslderadons: High
seedling mortality due to tow available water
capacity and low inherent fertility.
lyldlife management considerations: This map
unit provides shelter and limited food during
summer through tai! months. Thinning or
creating small openings in the overstory canopy
cover can stimulate understory productivity.
Acid precipitation buffering capacity: {ow.
Map Unit: 701M-Leighcan -Endlich families
complex, 5 to 40 percent slopes.
Ecological Land Unit: 707 M-subalpine fir and
Engeimann spruce on subalpine mountains,
mesas, and plateaus.
MAP UNIT SETTINGS
LocaGOn: mountainous areas where igneous and
metamorphic rocks predominate.
Landform: mountains, mesas, and plateaus.
Parent material: colluvium and residuum.
Geologic symbol: Xb, Xfh, Xg, and Yg.
Elevation range: 10,000 to 11,800 feet.
Aspect: all.
Climatic zone: subalpine.
Mean annual precipitation: 20 to 40 inches.
Mean annual air temperature: 34°F. to dC°F.
Average annual snowfall: 200 to 400 inches.
COMPOSITION
55 percent Leighcan and similar soils.
30 percent Endlich and similar soils.
Contrasting inclusions
5 percent Cryaquolls along stream drainages and
seeps.
5 percent exposed bedrock.
5 percent soils with a argiliic horizon.
TYPICAL PROFILES:
Leighcan
Surface covering layer:
2.5 to 0 inrlles -conifer litter and duff.
Surface layer{s}:
0 to 1 inches -very dark grayish bro:vn, very
stony loam.
Subsurface layer(s):
1 to 7 inches -brown, very stony sandy foam.
7 to 12 inches -brown, extremely cobbly sandy
loam.
Subsoil layer(s):
12 to 32 inches -dark yellowish brown,
extremely cobbly sandy loam.
32 to 50 inches -yellowish brown, extremely
stony sandy loam.
Substratum layer(s):
50 to 65 inches -light olive brown, extremely
stony loamy sand.
Endlich
Surface covering layer.
1.5 to 0 inches -conifer litter and duff.
Surtace layer(s):
0 to 8 inches -pate brown, very stony loam.
Subsoil layer(s):
8 to 23 inches - sL'ong brown, very stony loam.
Substratum layer{s):
23 to 35 inches -brown, extremety stony sandy
loam.
Unweathered bedrock:
35 inches -hard gneiss bedrock.
SOIL PROPERTIES AND QUALITIES
Leighcan
Effective rooting depth: greater than 40 inches.
Drainage crass: somewhat excessively.
Depth to seasonal high water table: greater
than 6 feet.
Avallabfe water capacity: very low to low.
Permeability: moderately rapid.
Runoff: medium.