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

Sob and ecologiwf land unit survey
Leighcan
Surface covering layer.
2.fi t0 0 inches - conffer litter and duff.
Surface layer(s):
0 to 1 inches -very dark grayish brown, very
stony loam.
Subsurface layer(s):
1 to 7 inches -brown, very stony sandy loam.
7 io 12 inches -brown, extremely cobbly sandy
4~am.
Subsoil Payer(s):
12 to 32 inches -dark yellowish brown,
extremely cebbly sandy loam.
32 to 50 inches -yellowish brown, extremely
:stony sandy loam.
Substratum layer(s):
50 to 65 inches -light olive brown, extremely
;otony loamy sand.
SOIL PROPERTIES AND QUALITIES
Howstrdsvitte
Efhsedve roofing depth: greater than 20 inches.
Drainage class: excessively.
Depth to seasonal high water table: greater
than 6 feet.
Avarflable water capacity: very low.
Permeability: rapid.
Runoff: medium.
Leighcan
C-fhectiva roofing depth: greater than 20 inches.
Drainage class: somewhat excessively.
Depth to seasonal h/gh water table: greater
than S feet
Avatilabte water capacity: very low to low.
Permeability: moderately rapid.
Runofi:• rapid.
VEGETATION
Potential natural communities:
Howardsviile: subalpine fir-Engelmann
sp+nlceicommon juniper (Able-Pienl/Juco)
typical sRe, and subalpine fir-Engelmann
spruce/Rocky Mountain whoNeberry (Abla-
Pienl/Vamy) moist site, and lodgepole
pineirusset buffaloberry (Pico/Shca} below
10,500 feel
Leh~hcan: subalpine fir-Engelmann
spruce/common juniper (Able-PienliJuco)
ty~oicai sRe, and todgepole pine/ (Pico/Aradj
berlow 90,000 feet, and lodgepole pine/russet
buffaloberry (Pico/Shca) below 10,500 feet
SeraV stages: dominated with lodgepole pine and
other plants of the respective potential natural
communities.
Pnas+?ni vegetation: dominated by plants of the
respective potential natural communities.
USE AND MANAGEMENT CONSIDERATIONS '
Mat%or uses: wildiffe habitat and watershed.
Mass movement potential
Landslides: low.
Debris flows: low.
Snow avalanche: low.
Sediment delivery etflciency: high.
Road and trail limitations:
Cut and flil slope stability
Howardsville: moderate- slope.
Leighcan: moderate-slope.
Improved unsurfaced roads:
Howardsville: severe- slope.
Leighcan: severe-sbpe.
Ofiroad vehicle roads artd trails:
Howardsvilie: severe- sbpe and erosion
hazard.
Leighcan: severe- slope and erosion hazard.
Foot traits and padre:
Howardsvitle: moderate- sbpe.
Leighcan; moderate- slope.
Revegetation limitations:
Howardsville: severe- low available water
capacity, low inherent ferdtfty, slope and erosion
hazard.
Leighcan: severe- very tow available water
capacity, tow inherent fertilely, slope and erosion
hazard.
Revegetation considerations: Plant drought
tolerant plants to survive south facing slopes.
Mu~lr a similar treatment wilt protect the soil
from erosion, help conserve soil moisture, and
protect emerging plant seedlings. Surface netting
will reduce the erasion hazani.
Timber management considerations: Limited by
slope, rock outcrop, erosion hazard, low available
water capacity, and south facing slopes. Trees
are slow to return after a disturbance due to lack
of shade. Trees to plant include lodgepole pine.
~Idlife management considerations: This map
unit provides shelter and limited food during
summer through fall months. Tfiinning ar
creating small openings in the overstory canopy
cover can stimulate understory productivity.
Odter management considerations:
Management activities era 8mited by steep slopes
and erosion hazard. Some areas have hatl
relatively tRde disturbance other than fire. Some
of these undisturbed areas qn contain ofd
growth trees.
Add praclpitadon buflertng capacity: low.
Map Unit: 779M-Herbman - Adderton families
complex, 0 to 15 percent slopes.