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

Northam San Isabel and Wastem Pike Nadonai Forests, Colorado
below 11,D00 feet and subalpine fir-Engelmann
sprucelgrouse whortietierry (Able-PienlNasc)
above 11,000 feet
Sera/ 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, wildlrfe habitat,
and watershed.
Mass movement potential:
Landslides: low.
Debris flaws: low.
Snow avalanche: k>vr.
Sediment delivery efficiency: low.
Road and hail limitations:
Cut and flN sbpe stability
Howardsvllle: slight.
improved unsurfaced roads:
Howatdsvllle: slight.
Ofh»ad vehicle roads and trans:
Howardsville: moderate- cobbles, stones, and
boulders.
Foot trails and paths:
Howardsville: slight
Revegetation consideratians: Muk:h or similar
treatment will protect the soil from erosion, help
conserve soil moisture, and protect emerging
plant seedlings. Fertilizer will supplement bw
inherent fertility.
Timber management considerations: High
seedling mortality due to low available water
capacity and tow inherent fertility.
lMldiife management considerations: This map
unit provides shelter and limited food during
summer through fail months. Thinning or
creating small openings in the overstory canopy
cover can stimulate understory productivity.
Acfd precipitation buffering capacity: low.
Map Unit: 701 M-Leighcan -Endlich families
+~mplex, 5 to 40 percent slopes.
Ecological Land Unit: 701M-subalpine fir and
Engelmann spruce on subalpine moundins,
mesas, and plateaus.
MAP UNIT SETTINGS
Location: mountainous areas when: igneous and
metamorphic rocks predomina6e.
Landfonn: mountains, mesas, and plateaus.
Parent material: coiluvium and residuum.
Geologic symbol: Xb, Xfh, Xg, and Yg.
Elevation range: 10,000 to 11,800 feet
Aspect: all.
Climatic zone: subatpine.
Mean annual precipitation: 20 to 40 inches.
Mea» annual atr temperature: 34°F. to 40°F.
Average annual snowhtlL• 200 to 400 inches.
COMPOSITION
55 percent Leighcan and similar soils.
30 percent Endlich antl similar soils.
Contrasting Inclusions
5 percent Cryaquolls along stream drainages and
seeps.
5 percent exposed bedrock.
5 percent soils with a argiltic horizon.
TYPICAL PROFILES:
Leighcan
Surface covering layer.
2.5 to 0 inches -conifer litter and duff.
Surface layer(s}:
0 to 1 inches -very dark grayish brown, very
stony loam.
Subsurface layers}:
1 to 7 inches -brown, very stony sandy loam.
7 to 12 inches -brown, extremely cobbly sandy
loam.
Subsoil layer(s}:
12 to 32 inches -dark yellowish brown,
extremely cobbty sandy foam.
32 to 50 inches -yellowish brown, extremey
stony sandy loam.
Substratum layers}:
50 to 65 inches -light olive brown, extremely
stony loamy sand.
Endlich
Surface covering layer.
1.5 to 0 inches - conifer litter and duff.
Surface layer(s}:
0 to 8 inches -pale brown, very stony loam.
Subsoil Iayer(s}:
8 to 23 inches - stirong brown, very stony foam.
Substratum layers}:
23 to 35 inches -brown, extremety stony sandy
foam.
Unweathered bedrock:
35 inches -hard gneiss bedrock.
SOIL PROPERTIES AND QUALiT1ES
Leighcan
Effective rooting depth: greater than 40 inches.
Drainage class: somewhat excessively.
Depth to seasons/ high water ta6/e: greater
than 6 feet,
Available water capacity: very low to tow.
Pennea6lifty: moderately rapid.
Runoff: medium.