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2008-07-18_PERMIT FILE - M2008006
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2008-07-18_PERMIT FILE - M2008006
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Last modified
8/24/2016 3:34:45 PM
Creation date
7/18/2008 1:25:33 PM
Metadata
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Template:
DRMS Permit Index
Permit No
M2008006
IBM Index Class Name
PERMIT FILE
Doc Date
7/18/2008
Doc Name
CDOT objector letter & response
From
Applegate Group, Inc.
To
DRMS
Email Name
PSH
Media Type
D
Archive
No
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Lined Pit Guide 8 September 2000 - <br />CLAY BACSFILL PIT LINERS <br />Applicants seeking the lower bond amount available under the regulated construction option for a <br />reclamation plan that includes a clay lined reservoir must provide a design for the liner. The intent of <br />the design can be effectively conveyed through plan and section views of the pit perimeters where a <br />liner will be installed. The liner cross section should illustrate the dimensions and shape of the liner fill <br />to be installed, the location, size, and shape of the keyway, and the dimensions of liner cover fill that <br />will protect the liner soil from desiccation and erosion.. The design should address the following <br />elements that may affect the performance of the liner.. <br />Liner Fill Mixture <br />Y Fines - The liner fill should contain at least 20 percent fines defined as. the percentage, on a dry <br />weight basis, of material passing the No. 200 sieve. <br />0 Plasticity Index - The soil should have a plasticity index of at least 10 percent, although some soils <br />with a slightly lower index may be suitable. Soils with plasticity indices less than about 10 percent <br />have very little clay and usually will not produce the necessary low permeability. Soils with <br />plasticity indices greater than 30 to 40 percent are difficult to work with, as they form hard chunks <br />when dry and sticky clods when wet. <br />® Percentage of Gravel - The percentage of gravel (material retained on the No. 4 sieve) should in <br />general not exceed 10 percent. Larger percentages are acceptable if it can be demonstrated that the <br />design standard for permeability can be achieved and that segregation of gravel into pockets that <br />contain little or no fines will not occur during installation. <br />s Stones and Rocks - No rocks larger than 2 inches should be present in the liner material. <br />If two or more materials will be blended to prepare the liner fill, a description of the mixing process <br />should be included in the design documents. For example, an Operator may choose to prepare the liner <br />fill by mixing 50 percent weathered shale ripped from the floor of the pit with 50 percent overburden. <br />The mixing may be accomplished by a number of methods such as windrowing of the materials and <br />multiple passes of mixing equipment such as a road reclaimer. <br />Water Content <br />The molding water content at which the maximum dry unit weight is observed for a given compactive <br />energy is termed the optimum water content. Soils compacted wet of the optimum water content tend <br />to have lower permeability. This is because a soil that is slightly wet of optimum will more readily <br />mold into a homogeneous mass that is free of clods. For liner fill, moisture content slightly wet of <br />optimum should be specified. For example: <br />Material represented by the samples tested having a water more than 1 percent dry of the <br />optimum water content, or more than 3 percent wet of the optimum water content will be <br />rejected and shall be removed or reworked until the water content is between these limits.
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