2017-02-03_PERMIT FILE - C1980004 ‎(2)‎

• Permit No: C1980004
• IBM Index Class Name: Permit File
• Doc Date: 2/3/2017
• Section_Exhibit Name: Volume I Sections 2.03 & 2.04
• Media Type: D
• Archive: No

2.04.9 Soils Resource Information
tolerated depending upon the size and the intended use of the reclaimed area. If the
size of rock fragments exceed ten inches, the problems are more severe (USDA, 1978).
Coarse fragments are evaluated based on pedon descriptions for soils on site. Most
soils are rated good throughout. Few horizons tested have more than 15 percent coarse
fragments larger than three inches and are rated fair. No soils are rated poor for coarse
fragments.
EVALUATION OF SURFACE MATERIAL ON MINE BENCHES
In response to Stipulation Number 6 attached to the original permit, Grand Valley
submitted a composite analysis of the surface material at the McClane Canyon Mine
site. The analysis indicated "slightly elevated SAR levels at both sites, and elevated salt
level at McClane Canyon, and a very high pH at Munger Canyon." (CMLR 8,9,85)
A second series of samples were taken at McClane Canyon to determine if the
elevated levels of SAR and salt were concentrated in the surface layer and would
necessitate special handling of the surface layer during reclamation. The samples were
taken on August 6, 1985 from four locations on both the upper and lower benches. After
the samples were collected they were combined and split to yield a sample from both
benches. Shown below are the results of sampling.
These data indicate that the elevated levels of salts and SAR are not
concentrated in the surface layers at the mine site and that no special handling of the
surface layers is necessary. Table 4.4-1 shows ranges of suitability for each parameter.
PRESENT AND POTENTIAL USES
CROPS AND PASTURELANDS
The SCS has made prime farmland determinations and published a map of prime
farmlands in Garfield County (USDA - SCS, 1979). There are no prime farmlands
mapped by the SCS in the permit area. A written negative determination was requested
from the SCS and is contained in Appendix L. None of the soils mapped at the site has
potential for crops or pastureland, unless irrigated.
There are no cultivated soils in the permit area nor have they been cultivated in
the past.
PR -02 2.04-48 10112
Original Sample
Upper Bench
Lower Bench
PH
8.4
7.25
7.4
SAR
5.5
2.12
1.32
Soluble Salts
6.0
3.70
3.4
(by conductivity)
These data indicate that the elevated levels of salts and SAR are not
concentrated in the surface layers at the mine site and that no special handling of the
surface layers is necessary. Table 4.4-1 shows ranges of suitability for each parameter.
PRESENT AND POTENTIAL USES
CROPS AND PASTURELANDS
The SCS has made prime farmland determinations and published a map of prime
farmlands in Garfield County (USDA - SCS, 1979). There are no prime farmlands
mapped by the SCS in the permit area. A written negative determination was requested
from the SCS and is contained in Appendix L. None of the soils mapped at the site has
potential for crops or pastureland, unless irrigated.
There are no cultivated soils in the permit area nor have they been cultivated in
the past.
PR -02 2.04-48 10112