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

Narthem San IsaCel and Western Pike National Forests, Colorado
tNfidlife management considerations: This map
unit provides shelter and limited food during
summer through fall months. Thinning or
creating small openings in the overstory canopy
cover can stimulate understory productivity.
Other management conslderatlons:
Management activities are limited by steep slopes
and erosion hazard. Some areas of this map unit
occur in generalty remote areas which have had
relatively little disturbance other than fire. These
undisturbed areas can contain old growth trees.
Acid precipitation buffering capacity: low.
Map Unit: 691Cr~Leighcan -Howardsvilie
families complex, till substatum, 40 to 60 percent
south slopes.
Ecological Land Unit: 6916--lodgepole pine,
subaipine fir, and Engelmann spruce on
subaipine, south facing lateral moraines.
MAP UNIT SETTINGS
Location: glaciated areas where igneous and
metamorphic rocks predominate.
Landiorm: lateral moraines.
Parent material: glacial till.
Geologic symbol: Od.
Elevat/on range: 10,000 to 11,600 feet.
Aspect: soutf~.
Climatic zone: subaipine.
Mean annual precipitation: 20 to 40 inches.
Mean annual air temperature: 34°F, to 40°F.
Average annual snowfall: 200 to 400 inches.
COMPOSITION
50 percent Leighcan and similar soils.
40 percent Howardsvilie and similar sails.
Contrasting inclusions
10 percent rubbly glacial debris.
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 ;oam.
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 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 sane.
Howardsvilie
Surface covering layer:
1 to 0 inches -conifer litter.
Surface layer(s):
0 to 2 inches -pate 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 yeNowish brown.
extremely stony loamy sand.
Substratum layer(s):
24 to 60 inches -brownish yellow, extremely
stony loamy sand.
SOIL PROPERTIES AND OUALITiES
Leighcan
Effective rooting depth: -greater than 60 inches.
Drainage class: somewhat excessively.
Depth to seasonal high wafer table: greater
than 6 feet.
Available water capacity: very low to low.
Permeability: moderately rapid.
Runoff: rapid.
Howardsvilie
Effective rooting depth: greater than 60 inches.
Drainage class: excessively.
Depth to seasonal high water table: greater
than 6 feet.
Available water capacity: very lour.
Permeability: rapid.
Runoff: medium.
VEtaETATION
Potential natural communities:
Leighcan: lodgepole pine/Rocky Mountain
whortleberry {PiceNamy) below 10.500 feet and
subaipine fir-Engelmann spruce/Rocky
Mountain whortleberry (Abla-PienlNamy)
typical site, and subaipine fir-Engelmann
sprucelgrouse whortleberry (Abla-Pient/Jucot
dry site.
Howardsvilie: Icdcepole pine/Rocky Mountain
whortleberry {PicoNamy) below 10,000 feet and
subaipine nr-Engelmann sprucerRocky
Mountain whortleberry (Abla-PieniNamyl
below 11,000 feet and subaipine fir-Engelmanr:
_=pruceigrouse whorGeberry (Abla-PieniNasc}
above 11,000 feet.
Seral stages: dominated wi,h lodgepoie pine.
Present vegetation: dominated by plants of the
respective potential natural communities.