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

Northam San Isabe! and Western Pike National Forests, Colorado
WiMllte management conslderatfons: This map
unit provides shelter and limited food during
summer through fall months. Thinning w
creating small openings in the overstory canopy
cover can stimulate understory productivity.
Other management considerations:
Management activities are limited by steep slopes
and erosion hazard. Some areas of this map unit
occur in generally remote areas which have had
relatively iittis disturbance other than fire. These
undisturbed areas can contain old growth trees.
Acid prectpttation buffering capacity: low.
Map Unit: 691 G-Leighcan - Howardsville
families complex, till substratum, 40 to 60 percent
south slopes.
Ecological Land Unit: 6916--iodgepote pine,
subalpine fir, and Engelmann spruce on
subalpine, south facing lateral moraines.
MAP UNIT SETTINGS
Location: glaciated areas where igneous and
metamorphic rocks predominate.
Landform: lateral moraines.
Parentmatedal giacialtiil.
Geologic symbol: Qd.
Elevation range: 10,000 to 11,600 feet
Aspect: South.
Climatic zone: subalpine.
Mean annual pnseipitation: ZO to 40 inches.
Mean annual air temperedrre: 34°F. to 40°F.
Average annual snowfall 200 to 400 inches.
COMPOSfTION
50 percent Leighton and similar soils.
40 percent Howardsvilie and similar soils.
Contrasting Inclusions
70 percent rubbty giacia! debris,
TYPICAL PROFILES:
Leighton
Surface covering layer.
2.5 to 0 inches -conifer litter and duff.
Surtace layer(s):
0 to 1 inches -very dark grayish brown, very
stony loam.
Subsurface layer(s):
1 to 7 inches -brown, very stony sandy foam.
7 to 12 inches -brown, extremely cobbiy sandy
loam.
Subsoil layer(s):
12 to 32 inches -dark yellowish brown,
extremety cobbty sandy loam.
32 to 50 inches -yellowish brown, extremely
stony sandy loam.
SubstraWm layers}:
50 to 65 inches -light olive brown, extremely
stony loamy sand.
Howardaville
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):
i 3 to 24 inches -light yellowish brown,
extremely stony loamy sand.
Substratum layer(s}:
24 to 6D inches -brownish yellow, extremely
stony foamy sand.
SOR PROPERTIES AND QUALITIES
Leighton
Effective rooting deptir: greater than 60 inches.
Drainage class: somewhat excessively.
Depth to seasonal high water fable: greater
than 6 feet
Available water capacity: very low to low.
Perrrreabfflty: moderately rapid.
Runoli: rapid.
Hawardsvfils
Effective rooting deptir: greater than 60 inches.
Drainage class: excessivey.
Depth to seasonal high wa0ar table: greater
than 6 feet.
Available water capacity: very kvnr.
Permeability: rapid. '
Runoff.' medium.
VEGETATION
Potential natural communmes:
Leighean: todgepole pinelRocky Mountain
whortlebeny (P'lcoNamy} below 10,500 feet and
subalpine fir-Engelmann sprucelRacky
Mountain whartiebeny (Able-PieniNamy}
typical site, and subalpine fir-Engelmann
sprutxigrouse whorHeberry (Able-PienilJuco}
dry site.
Hovrerdsville: lodgepole pinelRocky Mountain
whoNeberry (PicoNamy) below 10,000 feet and
subalpine fir-Engelmann spruce/Rocky
Mountain whortlebeny (Able-PienlNamy)
below 11,000 feet and subalpine fir-Engelmann
spruceigrouse whordeberry (Able-PienlNasc)
above 11,000 feet
Sera/ singes: dominated with lodgepote pine.
Present vegetation: dominated by plants of the
respective potential natural communities.