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APPCOR11480
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APPCOR11480
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Entry Properties
Last modified
8/24/2016 6:31:52 PM
Creation date
11/19/2007 2:20:34 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980006
IBM Index Class Name
Application Correspondence
Doc Date
12/23/1980
Doc Name
KERR NORTH PERMIT APPLICATION FN 80-157 RESPONSES TO 12-05-1980 ADEQUACY REVIEW
From
KERR COAL CO
To
MLRD
Media Type
D
Archive
No
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Carol Pahlke <br />December 23, 1980 <br />Page 10 <br />Pit #1 Area. Since the documented infiltration rate <br />for the soils within the Pit #1 Area fall within the <br />acceptable limits for irrigated croplands, one can <br />assume that they are satisfactory for the production <br />of native plant communities. The potential problem <br />of poor soil structure reducing infiltration and <br />permeability rates is also unfounded. As previously <br />discussed, these soils are normal with respect to <br />salinity and hence the salt levels do not have the <br />potential of adversely affecting soil structure. it <br />thus follows that the quality of both topsoil and <br />spoil is suitable plant growth medium with respect <br />to the above concerns from a chemical standpoint. <br />Moreover, infiltration rates and permeability are <br />increased through the use of chisel plowing and <br />mulching practices~at Pit #1 and throughout the <br />permit area. The proposed chisel plowing, as <br />detailed in the Permit Application, will relieve any <br />problems of soil compaction. Furthermore, because <br />the chisel points will go below the respread topsoil <br />into the spoil, the formation of an impermeable <br />interface between the topsoil and spoil will be <br />virtually eliminated. Mulching also enhances the <br />soil in these respects by adding organic matter and <br />pore spaces due to root growth. These reclamation <br />practices are addressed in Section 780.18 of the <br />Permit Application. <br />with respect to concerns regarding the clay content <br />of the spoil, Table 76, Texture Analysis of Over- <br />burden Raw Data, reveals texture classes of loam, <br />sandy clay and clay, with clay content ranging from <br />15 to 61 percent. From Table 42a, Soil Chemical and <br />Physical Properties Lab Analysis Kerr North Area, it <br />can be seen that topsoil clay content for the Coal- <br />mont (X73) soil type ranges from 50 to 73 percent, <br />and subsoil from 65 to 76 percent. <br />Application of Wyoming and Montana Guidelines to the <br />overburden samples from Pit #1 (from Table 73a and <br />Table 76) indicates that texture is the only param- <br />eter of concern here. Yet, from the information <br />above, it can be seen that the overburden actually <br />has lower clay content than either the topsoil or <br />subsoil. Average clay content of the overburden <br />after mixing is about 488, a content significantly <br />lower than the B horizon of the soil. These facts <br />make clear that there is no advantage to a separate <br />
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