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PERMFILE137359
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Entry Properties
Last modified
8/24/2016 10:38:01 PM
Creation date
11/26/2007 5:52:53 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981022
IBM Index Class Name
Permit File
Doc Date
12/11/2001
Doc Name
Coal Refuse Pile and Haul Road Design (Lincoln DeVore 1997)
Section_Exhibit Name
Exhibit 2.05-E4 Part 1
Media Type
D
Archive
No
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• Balaz & Associates <br />New Coal Waste Pile and Haul Road Project, Sanborn Creek Mine, Somerset, CO <br />June 18, 1997 Page 3 <br />It is possible that the quality of borrow materials may be such that a Geogrid material will have to be either <br />partially or completely substituted for the geotextile fabric. To make this detetmittation, either a lazge number <br />of exploration pits and additional laboratory testing will be required or changes will possibly be made during <br />actual wnswction. <br />The fill section at station 27+00 will probably require mechanically reinforced earth in the rntire fill. Evrn <br />though this slope is somewhat Flatter than the section at station 8+00, it is anticipated the materials used Cor <br />construction in this arcs may contain a significantly higher amount of sill and clay Ernes end the anticipated <br />wlluvial soils at the bast and toe area will control the design. The use of mechanically stabilized soils ' forces' <br />the projocted failure surfaces back toward or into the more wmpetrnt Bowie Member. It is anticipated the more <br />clsn• wltuvial soil will be used to conswct this fill. The `external wck loading' creates potential failure near <br />the upper fill face, which can be resisted by the mechanically stabilized earth. <br />Thc surface exposures of sandstone and siltstone are expressed on the topogaphy map as relatively steep slopes, <br />~~ttich were initially avoided for the road alignmrnt. ARer wnsidcration of the increased amounts of sandstone <br />and siltstone beds in these areas, it is believed the majority oC the cut slopes can be steepened to between 1:2 <br />(H:V) to 1:4 (H:V) without sacrificing the integrity of these cut slopes. These cut slopes will have to be carefully <br />• observed during the wnswction process to determine if any additional stabilization techniques, such as <br />benching, (latter slopes, rock buttress/MSE walls or tie-backs in the worse case are required. <br />Item l8_ Location and Type of Fill Slopes LinwlnDeVareandBalaz&Associatesheve <br />jointly developed shcet OXWVF• I G to indicate typical cut and fill sections, slope stabilization and anticipated <br />stationing along the proposed toads for revicty, bidding and wnswction purposes. Actual field wnditions may <br />require modifications of this plan. <br />Ilcm 24. Scdimcnt Pond Edward M. Moms. PE, of Linwln DcVorc was present, during the <br />excavation of an exploration trench within the proposed sediment pond on 9-1 G-9G. IL was our understanding <br />that as this exploration trrnch was being logged by personnel oC WESTEC, and that a log of the soil profile and <br />rewmnrcrrdations Cor the wnswction of the sediment pond would be Corthwming Crom WESTEC. Following <br />is our description of this exploration pit. Personnel of Lincoln DcVorc did not obtain any samples for testing <br />and the following descriptions will be based on visual logging only. <br />Thc exploration pit ryas situated near the in-flow point oC the sediment pons, as indicated on the attached <br />drawing. This drawing is based upon the Plan of the Scdimcnt Pond as depicted on the Plan OXWVF-03. <br />prepared by Balaz & Associates. Thc total trench was approximately 50 fat long, including minor probing at <br />the upstrcarn side. near the visible outcrop oC the Rollins Sandstone. At the lower, southern end of the trench, <br />the native debris fan/colluvial material .vas cnwuntcrcd at a total depth of IS fact and the Rollins Sandstone <br />surface had fallen bclrnv the maximum reach of the backhce bucket. At approximately 10 fat below the ground <br />surface, some iron/stcel debris ryas encountered, indicating the original ground surface may have been <br />approximatch 10 feet bclrnv the presrnt ground surface. It is believed that some of the 'recent' fill in this gully <br />is related to construction oC the Railroad embankment. At a depth of 6 to 7 feet below the prcsrnt ground <br />. surface, a cm rcek}• zone was enwuntered, which does not appear to be man-made fill but appeared to be part <br />of natural deposits of alluvium and wiluvium The type of stratif ication, the orientation of the rock and boulder <br />
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