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 and Western Pike National Forests, Colorado
Runoff: sVow.
VEGETATION
Potential natural communities:
Legault: subalpine fir-Engelmann spruce/Rocky
Mountain whortleberry (Abla-PienlNamy)
typical site, and subalpine fir-Engelmann
spruce/common juniper (Abla-PienllJuco) dry
site, and lodgepole pine/Rocky Mountain
whortleberry (PicoNamy) below 10,500 feet.
Howardsville: subalpine fir-Engelmann
spruce/Rocky Mountain whortleberry (Abla-
PienlNamy) typical site, and subalpine fir-
Engelmann spruce/common juniper (Abla-
PientlJuco) dry site, and lodgepole pine/Rocky
Mountain whortiebeny (PicoNamy) below
10,500 feet.
Saral stages: dominated with lodgepole pine and
other plants of the respective potential natural
communities.
Present vegetarian: dom{Hated by plants of the
respective potential natural communities.
USE AND MANAGEMENT CONSIDERATIONS
Major uses: limited timber harvest, limted
livestock grazing, wildl'rfe habitat, and watershed.
Mass movement potentiate.
Landslides: low.
Debris flows: low.
Snow avalanche: low.
Sediment delivery efficiency: high.
Road and trail limitations:
Cut and Flt slope stability
Legauk: slight.
Howardsville: slight.
Improved unsurfaced roads:
Legault: slight.
Howardsville: slight.
Offroad vehicle roads and trails:
Legautt: severe- erosion hazard.
Howardsville: severe- erosion hazard.
Foot trails and paths:
Legault: slight
Howardsville: slight.
RevegetaUon limitations:
Legauk: severe- very low available water
capacity, low inherent fertility, and shallow depth
to soft bedrock.
Howardsville: severe- very !ow available water
capacity and low inherent fertility.
Revegetation considerations: Mulch or similar
treatment wit: protect the soil from erosion, help
conserve soil moisture, and protect emerging
plant seedlings.
77mbermanagementconsiderations: Limited by
windthrow hazard and low available water
capacity on shallow soils. Trees to plant include
lodgepole pine.
~ldlifa management considerations: This map
unit provides shelter and limited foed during
summer through fall months. Thinning or
creating small openings in the overstory canopy
cover can stimulate understory productivity.
Other management considerations: Some
areas have had relatively little disturbance other
than fire. Some of these undisturbed areas can
contain old growth trees.
Acid precipitation buffering capacity; low.
Map Unit: 770S-Howardsville - Leighcan families
complex, 40 Yo 65 percent slopes.
Ecological land Unit: 770S-lodgepole pine,
subalpine fir, and Engelmann spruce on
subalpine, south facing mountains.
MAP UNtT SETTINGS
Location: mountainous areas where igneous and
metamorphic rocks predominate.
landform: mountains.
Parent material: residuum and coliuvium.
Geologic symbol: Tmi, Xb, Xfh, Xg, Yg, and Yp.
E/evation range: 9,000 tot 1,800 feet.
Aspect: south.
Climatic zone: subalpine.
Mean annual precipitation: 20 to 40 inches.
Mean annual air temperature: 34°F. ifl 40°F.
Average annual snowfall: 300 to 400 inches.
COMPOSITION
60 percent Howardsville and similar soils.
25 percent Leighan and similar soils.
Contrasting inctusiorrs
10 percent cliffs and talus.
5 percent shallow soils on convex slopes.
TYPICAL PROFILES:
Howardsvflle
Surface covering layer
1 to 0 inches -conifer litter.
Surface layer(s):
0 to 2 inches -pale brown, very stony sandy
loam.
Subsurface layer(s):
2 to 13 inches -very pale brown, very stony
loamy sand.
Subsoil layer(s):
13 to 24 inches -light yellowish brown,
extremely stony loamy sand.
Substratum layer(s).
24 to 60 inches -brownish yellow, extremely
stony foamy sand.