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 Sen Isabel and Western Pike Netianai Pareata, Cdorado
Runoff:• slow.
VEGETATION
Potential natural communities:
Legautt: subalpine fir-Engelmann spruce/Rocky
Mountain whortleberry (Abta•PienlNamy)
typical site, and subalpine fir-Engelmann
sprucelcommon juniper (Able-Pien1lJuco) dry
site, and iodgepole pinelRocky Mountain
whortleberry {PicoNamy) below 10,500 feet
Howardsvilie: subalpine fir-Engelmann
sprucelRocky Mountain whortlebeny (Abla-
Pien1Namy) typical site, and subalpine fir-
Engelmann spruce/common juniper {Abla-
Pient/Juco) dry site, and lodgepole pinelRocky
Mountain whortleberry (PicoNamy} below
10,500 feet
Sera) stages: dominated with bdgepole pine and
other plants of the respective poten6ai natural
communities.
Present vegetetlort: dominated by plants of the
respective potential natural communities.
USE ANO MANAGEMENT
Major uses: limited timber harvest, limited
liveskock grazing, wildlife habitat, and watershed.
Mass movement potentlai:
Landslides: low.
Debris Bows: low.
Snow avalanche: low.
Sediment delivery efficiency: high.
Road and trail limitations:
Cut and fill slope stability
Legault: slight.
Howardavilie: Slight.
Improved unaurfaced roads:
Legauh: slight
Howardsvilie: slight
Ofhoad vehicle roads and trails:
Legautt: severe- erosion hazard.
Howardsvilie: severe- erosion hazani.
Foot trails and paths:
Legauk: slight
Howardsvilie: slight.
Revegetatiort limitations:
Legauft: severe- very law available water
capacity, low inherent fertility, and shallow depth
to soft bedrock.
Howardsvilie: severe- very low available water
capacity and low inherent fertility.
Revegetation considerations: Mulch or similar
treatment wil! protect the soil from erosion, help
conserve soA moisture, and protect emerging
plant seedlings.
ember management considerations: Limited by
windthrow hazard and bw available water
capacity on shallow soils. Trees to punt inGude
lodgepole pine.
YVIIdIKe management consfderatfons: 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 considerations: Some
areas have had relatively little disturbance o#ter
than fire. Some of these undisturbed areas can
contain old growth trees.
Acid pnacipitation buffering capacfty: low.
Map Unit: 7705-Howardsvilie - Leighcan families
tbmplex, 40 to 65 percent slopes.
Ecological Land Untt: 770S-lodgepole pine,
subalpine fir, and Engelmann spruce on
subalpine, south facing mountains.
MAP UNIT SETT{NGS
Locatlon: mountainous areas where igneous and
metamorphic rocks predominate.
Landfonn: mountains.
Parerrtmaterfah. residuum and colluvium.
Geologic symbol: Tmi, Xb, Xfh, Xg, Yg, and Yp.
Elevation range: 9,000 to 11,800 feet
Aspect south.
Climatic zone: subalpine.
Mean annual p-ecipitation: 20 to 40 inches.
Mean annual afr temperature: 34°F. to 40°F.
Average annual snawfali: 300 to 400 inches.
COMPOSITION
60 percent Howardsvilie and similar soils.
25 percent Leighcan and similar soils.
Contrasting inclusions
10 percent cliffs and talus.
5 percent shallow soils on convex slopes.
TYPICAL PROFILES:
Howardsvilie
Surface covering layer.
1 to 0 inches -conifer litter.
Surface Iayer(s}:
0 to 2 inches -pale brown, very stony sandy
loam.
Subsurface layers}:
2 to 13 inches -very pale brown, very stony
loamy sand.
Subsoil layer{s}:
13 to 24 inches -tight yellowish brown,
extremey stony loamy sand.
Substratum layers}:
24 to 60 inches -brownish yellow, extremely
stonv loamv sand.