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

Northern San Isabel antl Western tie National Forests, Colorado
USE AND MANAGEMENT CONSIDERATIONS
M$joruses: mining, recreation, scenic vistas,
wildlife habitat, and watershed.
Mass movement potential:
l,.andslides: low.
Debris flaws: low.
Snow avalanche: low.
Sediment delivery efficiency: low.
Rood and trail limitations:
Cut and fill slope stabllfty
Moran: slight.
Rubble land: slight
Teewinot: slight.
improved unsurfaced roads:
Moran: slight
Rubble land: moderate- shallow depth to
bedrock.
Taewinot: slight
Offroad vehicle roads and traits:
Moran: severe- soli erosion, surface
compaction, and rutting.
Rubble land: severe- soil erosion, surface
compaction, and rutting.
Teewinot: severe- cobbles, stones, and
boulders.
Foot trails and paths:
Mayan: slight
Rubble land: slight.
Teewinot: slight
Revegetation limitations:
Moran: severe- short growing season and low
available water capacity.
Rubble land: severe- short growing season,
shallow depth to bedrock, and low available
water capacity.
Teewinot: severe- rubble land.
Revegetation considerations: Cold tolerant
plants are required to survive alpine cdimate.
Mulch or similar treatment will protect the soil
from erosion, help conserve soil moisture, and
protect emerging plant seedlings.
Wl/dlffe management conslderadons: This map
unit provides food and limited sheRer during
summer months.
Other managementcons/derations:
Management activities are limited by cold climate.
Alpine plant associations vary Pram 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 preclpttation buHer/ng capacity: low.
Map Unit; 922A-~Aoran family -Rock outcrop -
Teewinot family complex, 40 to 150 percent
sopes.
Ecological Land Unk: 922A--alpine grasses,
sedges, and forts on alpine mountains.
MAP UNtT SETTtNGS
Location: alpine areas where igneous an
metamorphic rocks predominate.
Land/orm: mountains.
Parent material: residuum and colluvium.
t'aeologlc symbol: Tmi, Xb, Xfri, Xg, and Yg.
Elevation range: 11,600 to 13,500 feet.
Aspect: all,
Climatic zone: alpine.
Mean annual precfpitation: 30 to 50 inches.
Mean annual air temperature: 34°F. to 38°F.
Average annual snowlail: 300 to 500 inches.
COMPOSITION
30 percent Moran and similar soils.
30 percent Rock outcrop.
25 percent Teewinot and similar soils.
COlit/BatiRg InCIUS%QiiB
10 percent soils that lacks dark surface on
exposed, convex slopes.
5 percent eroded soils on over-steepened slopes.
TYPICAL PROFILES:
Moran
Surface layer(s):
0 to 2 inches -dark grayish brown, gravelty
sandy loam.
2 [010 inches -brown, grave9y sarxiy barn.
Subsoil layer(s):
10 to 20 inches -yellowish brown, very gravelly
sandy loam.
2D to 32 inches - light yelowish brown, vary
cobbty sandy loam.
Substratum layer(s};
32 to 60 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 loam.
Unweathered bedrock:
10 inches - hartl gneiss bedrock.
SOIL PROPERTIES AND QUALITIES
Moran
Effective roofing depth: greater than 20 inches.
Drainage class: somewhat excessively.
Depth to seasonal high water table: greater
than B feet.