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

Ncrthem San Isaoel and NJestem Pike National Forests, Coloradc
USE AND MANAGEMENT CONSIDERATIONS
Major uses: mining, recreation, scenic vistas,
wildlife habitat, and watershed.
Mass movement potential:
landslides: low.
Debris slows: low.
Snow avalanche: low.
Sediment delivery efficiency: low.
Road and trail limitations:
Cut and fill slope stability
Moran: slight.
Rubble land: slight.
Teewinot: slight.
Improved unsurfaced roads:
Moran: slight.
Rubble land: moderate- shallow depth to
bedrock.
Teewinot: slight
Offroad vehicle roads and trails:
Moran: severe- soil erosion, surface
compaction, and rutting.
Rubble land: severe- soil erosion, surface
compaction, and rutting.
Teewinot: severe- cabbies, stones. and
boulders.
Foot trails and paths:
Moran: slight
Rubble land: slight.
Teewinot: slight.
Revegetation limitations:
Moran: severe- short growing season and low
available water capacity.
Rubble tend: severe- short growing season,
shallow depth to bedrock, and low available
water capacity.
Teewinot: severe- rubble land.
Revegetation considerations: Colo tolerant
plants are required to survive alpine climate.
Mulch or similar treatment will protect the soil
from erosion, help conserve soil moisture, and
protect emerging plant seedlings.
Wildlife management considerations: This map
unit provides food and limited shelter during
summer months.
Other management considerations:
Management activities are limited by cold climate.
Alpine plant associations vary from area to area
and are controlled by microsite conditions. This
diversity of plant associations creates a relatively
high degree of biodiversity on steep alpine
slopes.
Acid prec/pitation buffering capacity: low.
Map Unit: 922A-Moran family -Rock outcrop -
Teewinot family complex, 40 to 150 percent
slopes.
Ecological Land Unit: 922A-alpine grasses,
sedges, and forts on alpine mountains.
MAP UNIT SETTINGS
Location: alpine areas where igneous an
metamorphic rocks predominate.
Landfonn: mountains.
Parent material: residuum and colluvium.
Geologic symbol: Tmi, Xb, Xfh, Xg, and Yg.
Elevation range: 11,600 to 13,500 feet.
Aspect: all.
Climatic zone: alpine.
Mean annual precipitation: 30 to 50 inches.
Mean annual air temperature: 34°F. to 38°F.
Average annual snowfall: 300 to 500 inches.
COMPOSITION
30 percent Moran and similar soils.
30 percent Rock outcrop.
25 percent Teewinot and similar soils.
Contrasting inclusions
10 percent soils that lacks dark surface on
exposed, convex slopes.
5 percent eroded soils on over-steepened slopes.
TYPICAL PROFILES:
Moran
Surface layer{sj:
0 to 2 inches -dark grayish brown, gravelly
sandy loam.
2 to 10 inches -brown, gravelly sandy tam.
Subsoil layer(s):
10 to 20 inches -yellowish brown, very gravelly
sandy loam.
2D to 32 inches -light yellowish brown, very
cobbly sandy loam.
Substratum layer(s):
32 to 6D inches -light olive brown, very cobbly
sandy loam.
Teewinot
Surface layer(s):
0 to 4 inches -dark grayish brown. very stony
loam.
4 to 10 inches -brown, very stony Icam.
Unweathered bedrock:
10 inches -hard gneiss bedrock.
SOIL PROPERTIES AND QUALITIES
Moran
Effective rooting depth: greater than 20 inches.
Drainage class: somewhat excessively.
Depth to seasonal high water table: greater
than 6 feet.