2010-12-17_REVISION - C1981019 ‎(156)‎

• Permit No: C1981019
• IBM Index Class Name: REVISION
• Doc Date: 12/17/2010
• Doc Name: Exhibit 9 Item 8 Appendix B Report Tables
• Type & Sequence: PR3
• Email Name: JRS
• Media Type: D
• Archive: No

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BASELINE SURVEY OF SOIL RESOURCES
COLLUM MINING AREA
MAP UNIT DESCRIPTIONS

Map Unit' Slc pe.Pct. . Components % Surf Text Topsoil Subsoil Limiting Factors Inclusions Comment
Lamphier 35 Loam Deep loess deposits on steep slopes in the
147 [10-50 18 15 High coarse fragments and clay Some skeletal or shallower (e.g., Rhone) and non- southern end of the project area. This unit occurs
Cochetopa 35 Loam at depth. pachic Cryolls (e.g., Owen Creek and Jerry). on the leeward aspects of the slopes. Slumping
occurs frequently.
Rhone 50 12 18 High Rock Content. Th
il
f
ese so
s
ormed from loess deposited on steep

48
20
70 Some of the moliic epipedons are thinner slopes in the southwest portion of the survey area.
-
Skyway
35 Loam
20
6
Bedrock
(Thornburgh) or thicker (Lamphier). Sloughing was observed in many of the
landscapes. Lamphier occurs at the base of
slopes where soil accumulates.
These soils formed from loess deposited over
High coarse fragments and clay Soils with deeper loess deposits (Lamphier) and shale and sandstone colluvium. This colluvial
Rhone v. - Thick Phase
90 Loam & Silt 20 12 at
depths between 24 and 36 some argillic horizon development (Cochetopa) material is frequently present within the textural
(Fine-Loamy/Loamy-Skeletal) Loam inches. are present, but non-limiting within the proposed control section. The unit primarily occurs on
salvage depths. northwest-facing slopes in the southern portion of
the project area.
This unit occurs on slopes with shallow loess
High coarse fragments and clay Non-limiting soils include coarser soils (Skyway) accumulation over sandstone colluvium and
50 20-50 Rhone v. - Thin Phase 65 Loam 12 15 at depths between 12 and 24 and soils developed from deeper loess deposits bedrock. In the northern portion of the project
(Fine-Loamy/Loamy-Skeletal) inches, more below 27 inches. (Lamphier). Jerry is also likely present. area, this unit only occurs on steep north facing
(shaded) slopes where the temperature regime is
likely cryic.
Rhone v. - Thick Phase 40 16 30 High rock content and less
(Fine-Loamy/Loamy-Skeletal) nutrients at depth. Thinner loess deposits and shallower depth to the

51
20-35
Loam
t
t
i
l
lt i
hi
i
l
i This unit occurs on relatively less steep west
High clay content and rock paren
ma
er
a
s resu
n non-pac
c
nc
ons
us
facing slopes with notable shale influences.
Cochetopa 40 12 24 fragments in subsoil and more such as Jerry and Thornburgh.
be and Winches.
Rhone v. - Thin Phase 40 Loam 15 6 High clay and coarse fragments Pachic and non-pachic soils with argillic horizons This soil occurs on narrow ridges between north-
(Fine-Loamy/Loamy-Skeletal) within 20 inches. O
k
C
d C
h
t
d d

52
10-35
il h
h
S
b
hi
l
t
t (
wen
ree
an
oc
e
opa) an
eeper south oriented drainages in the southern end of
u
so
as
g
c
ay con
en Haplocryalfs are present. All inclusions are less the study area. Variable loess deposits over
Shallow Haplocryalfs 40 Clay Loam 6 15 with little profile development limiting than the shallow Haplocryalfs. shallow shale result in the complex.
beyond 20 inches.
Thinner loess deposits and shallower depth to the This map unit occurs on very steep slopes and is
Subsoil is the transition from parent materials result in non-pachic inclusions comprised of loamy loess over weakly altered
53 25-75 Rhone 65 Silt Loam 24 12 loess to colluvium and bedrock such as Jerry and Thornburgh. Some colluvium. There is a notable discontinuity in the
below. accumulations of loess are 40+ inches thick and profile at this break with a thin transition to the
similar to Lamphier. unaltered colluvial materials.
High clay content and coarse This unit is found ridge tops where residual
Loam & Clay fragments in the subsoil. Similar, but lithic soils are present in this unit, as sandstone and shale have weathered to produce
54 0-25 Owen Creek (Shallow) 70 Loam 8 12 Frequently shallow depths (16- are deeper mollisols (Jerry). frequently shallow soil with high clay content.
20 inches) to sandstone or Sandstone coarse fragments are found in many of
shale. the soils.

55

0-35

Owen Creek

60

Loam

10

20
High clay content and rock Some soils in this unit have pachic epipedons

(Cochetopa) and others are loamy-skeletal. Few
These soils are located on complex slopes delve
fragments in the subsoil.
lithic profiles present. from mixed colluvium with a thin covering of loess.

Jerry
50
12
11 Known high clay content and This unit occurs in the Order III survey area only.
56 25-70 likely high coarse fragments at Similar soils. Map unit properties determined from the NRCS
Cocheto a 35 19 depth. survey for Moffat County.
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