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2010-10-13_REPORT - C1981010
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2010-10-13_REPORT - C1981010
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Last modified
8/24/2016 4:25:22 PM
Creation date
10/13/2010 1:39:09 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981010
IBM Index Class Name
REPORT
Doc Date
10/13/2010
Doc Name
3rd Quarter 2010 Horse Gulch Fill Insp Report
From
Trapper Mining Inc.
To
DRMS
Permit Index Doc Type
Waste Pile/Fill Report
Email Name
RDZ
Media Type
D
Archive
No
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October 11, 2010 <br />1.0 Introduction <br />2 <br />In compliance with Rule 4.09.1 (11) of the Regulations of the Colorado Mined Land Reclamation Board <br />for Coal Mining, a quarterly inspection and report on the construction and associated activities of the <br />Horse Gulch Fill (HGF) at Trapper Mine in Craig, Colorado has been completed. The quarterly inspection <br />was conducted on September 30, 2010, by Seth A. Puls, a licensed professional engineer in the State of <br />Colorado. <br />Construction activity related to the fill has been consistent with the approved design. Details of this <br />design can be found in Agapito Associates, Inc.'s (AAI) Horse Gulch Fill Stability Analysis, dated May 29, <br />2009. <br />No appearances of instability, structural weakness, or other hazardous conditions were observed. <br />2.0 Critical Construction Periods <br />2.1 Removal of All Organic Material and Topsoil <br />Topsoil and organic material removal activities were conducted during third quarter of 2010. Topsoil <br />removal occurred from the remaining topsoil adjacent to the K1-08 topsoil pile, and from the K1-08 <br />topsoil pile (these areas are depicted on Drawing 1). This material was taken to the face of the HGF, and <br />placed on the regraded slope from the 7470' bench to the toe of the fill. Additional topsoil was hauled <br />to a stockpile off of the HGF. This activity will continue into the fourth quarter of 2010. All topsoil and <br />organic material is removed prior to placement of fill materials. <br />2.2 Placement of Underdrainage Systems <br />The underdrainge system was completed in the first quarter of 2010; additional work on this system is <br />not anticipated. <br />2.3 Installation of Surface Drainage Systems <br />Initial construction activities for surface drainage systems began during this quarter. Rough grading of <br />channels for the North and South rip-rap channels was completed. Backfilling of these channels with <br />rip-rap will likely occur during the fourth quarter of 2010. Triangular ditches are designed for each of <br />the benches along the face of the fill. Rough grading for these ditches was initiated, but not completed <br />prior to the end of the quarter. <br />2.4 Placement and Compaction of Fill Materials <br />Fill material was placed during this quarter. Fill was placed along the Northern edge of the HGF by <br />dozers and the Molly Brown dragline. This portion of the fill was inspected for stability, and no <br />appearances of instability, structural weakness, or other hazardous conditions were observed. <br />The bulk of fill material for this quarter was placed by Komatsu 830E-AC haul trucks. Dump areas were <br />limited to 50' in height, in accordance with the approved design, though 30' - 35' lifts were the typical
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