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PERMFILE125186
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PERMFILE125186
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Last modified
8/24/2016 10:22:38 PM
Creation date
11/25/2007 1:33:48 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980007
IBM Index Class Name
Permit File
Doc Date
12/11/2001
Doc Name
Sylvester Gulch Facilities Area
Section_Exhibit Name
Exhibit 27A Baseline Soil Study (1996)
Media Type
D
Archive
No
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• SOIL HORIZON STRIPPP~ iG DEPTHS <br />Soil depths aze based on the horizon depths observed in the test pits. As horizon depths <br />may vary significantly, stripping should rely on obvious changes in the chazacter of the <br />soil being stripped (e.g. color and texture changes) to establish horizon boundaries <br />during salvage operations. Variants within soil mapping units show differences in <br />depth of suitable plant growth medium. To distinguish variants within the map soil <br />map units, individuals in the field may also rely on the following vegetation community <br />guides to assist in stripping operations. Work loams were found nearly exclusively in <br />the dry meadow vegetation type. Beenom-Absazokee(1) soils were encountered in the <br />Douglas fir community while Beenom-Absazokee(2) soils were found in mixed stands <br />of Colorado blue spruce, Douglas fir, aspen, and Gambel's oak. Torriorthents were <br />encountered in the oakbrush community. Fluvent(1) soils were found in the limited <br />riparian community surrounding and within the lower Sylvester Gulch drainage. <br />Fluvent(2) soils were encountered only within the northernmost east branch of <br />Sylvester Gulch, within the riparian community in areas dominated by Colorado blue <br />spruce. <br />The range in stripping depths for individual soil types are presented below. Stripping <br />depth ranges were determined from the test pits within each soil type. Statistical <br />variance of soil depths was determined by calculating the variance and standazd <br />• deviation of the suitable soil depth by soil type, based on individual test pit <br />measurements. Soil type depth range and variance is provided to illustrate the <br />variability in soil depth throughout the study area. <br />Soil Type Depth Range Statistical Depth <br />Suitable Soil Variance <br />Work loam 12-74 inches 20.7 inches <br />Beenom-Absazokee(1) 10-24 inches 6.2 inches <br />Beenom-Absarokee(2) 8.25-29 inches 9.3 inches <br />Fluvent(1) 14-45 inches 15.6 inches <br />Fluvent(2) 52 inches 0 inches <br />Torriorthent(1) 6-29 inches 6.1 inches <br />Torriorthent(2) not recommended for salvage <br />Torriorthent(3) not recommended for salvage <br />CDMG rule 4.06.2(2) requires topsoil (defined as surface soil horizons capable of <br />supporting plant life) to be salvaged for use in reclamation and revegetation post- <br />mining. Surface soil horizons within the SGFA study area include both A and B <br />horizons, depending on the soil type. MCC proposes to strip A and B horizons suitable <br />for plant growth over the SGFA to depths sufficient to replace an average of 24 inches <br />of soil over the disturbed azea during reclamation. Salvaged soil will be a mixture of A <br />and B horizons from the soil types present. Horizons exhibiting limitations should not <br />be stripped (Work loam B/C, Beenom-Absazokee(1) C, Fluvent(1) C, Fluvent(2) C, <br />-ld- <br />
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