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2011-08-29_REVISION - M1986015 (11)
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2011-08-29_REVISION - M1986015 (11)
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Last modified
6/15/2021 5:44:20 PM
Creation date
8/30/2011 7:22:22 AM
Metadata
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Template:
DRMS Permit Index
Permit No
M1986015
IBM Index Class Name
REVISION
Doc Date
8/29/2011
Doc Name
Amendment Submittal
From
Continental Materials Corporation
To
DRMS
Type & Sequence
AM4
Media Type
D
Archive
No
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• <br />• <br />• <br />Potentially Problematic Soils <br />In light of the difficulties encountered with saline and sodic soils present at the Pueblo <br />West Pit and in recognition of the similarity between the natural soils on this site and those at <br />Pueblo West, the soil descriptions have been carefully examined to determine which soils might <br />contribute to similar problems here. Problematic soils do not necessarily need to be avoided in <br />the salvage and replacement processes, but should be further examined to determine whether <br />that particular soil should be eliminated from a growth medium and would best be used for <br />other purposes. Because of the extreme difficulty of revegetating soils that are saline and/or <br />sodic and especially so if they are clayey, not all topsoils present on this site should be <br />considered of equal value and utility in the revegetation. The following units have been <br />identified as being potentially problematic. <br />Apishapa silty clay: The typical characteristics of this soil shows increasing pH and <br />alkalinity with depth and the potential for salinity in excess of 4 to 6 mmhos /cm at 25 These <br />are indicators of potentially saline and/or sodic soils that would require special treatment or <br />unusual revegetation techniques. If surface indicators show possible problems, sampling of this <br />soil should be done prior to salvage. The soils should be tested for salinity and SAR. If the <br />salinity exceeds 6 and the SAR is higher than 12, the soil should not be salvaged and used in the <br />revegetation program without special treatments including heavy leaching and potentially a <br />separate seed mixture. Although these soils offer some potential for wetland creation, the high <br />clay content would favor establishment of more or less monocultural populations of cattail which <br />is often not quality wetland vegetation. Soils that exceed the maxima stated above would <br />probably best be used in a buried backfill condition so they do not affect the surface vegetation. <br />At this time no soil has been seen that exhibits characteristics that would be problematic. <br />Las Animas fine sandy loam: This soil can exhibit high salinity to 15 mmohs /cm. <br />However, because it is a sandy loam the effects of the salinity will be less problematic and <br />should leach rather readily. These soils should be approached with caution and should not be <br />mixed with clay soils. The latter is especially true if the clay soil contains suitable growth <br />properties as blending this soil will tend to degrade the clay soil making it hard and, if saline, <br />expressing the salinity with greater intensity. <br />Limon Series soils: Although usually good soils, these soils can have high salinity <br />values. In general these soils can be safely assumed to be suitable, but the more clayey portions <br />should be considered carefully as they might create some problems if salinity is above 6 <br />mmohs /cm. <br />2 <br />
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