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PERMFILE46063
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PERMFILE46063
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Last modified
8/24/2016 10:48:20 PM
Creation date
11/20/2007 12:36:11 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1982056
IBM Index Class Name
Permit File
Doc Date
5/21/2004
Section_Exhibit Name
Exhibit 07e-8 PR6 Railroad Evaluation Final Report
Media Type
D
Archive
No
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SubTerra, Inc. Twentymile Coal Company 6/19/2003 <br />PR6 Rail Line Evaluation <br />• H:V) on either side of the track which may, or may not, require extension of the culvert(s) beneath <br />the track and placement of fill in Fish Creek or its AVF. <br />The third and fourth areas of potential concern are where Fish Creek passes beneath the Energy <br />Spur (approximately at Station 388+50) and where the track is located immediately above Fish <br />Creek and its AVF (approximately at Station 385). Figure 18 shows the plan and cross-section for <br />the track at these locations. The predicted magnitudes of required re-elevation at both Station <br />388+50 and Station 385 are shown in Table 5, Column 9 as just less than 2-ft. This will require <br />extending the base of the ballast prism by less than 4-ft (at 2:1, H:V) on either side of the track at <br />each location. At the crossing area, this may, or may not, require culvert extension and possibly <br />fill placement in Fish Creek as the existing fill slope is at or greater than the 2:1 gradient preferred <br />by the railroad. However, it appears that the additional fill or ballast width can be accommodated <br />at Station 385 where the Energy Spur is located on the embankment above the AVF. <br />3.3 Detailed Remedial Planning and Field Implementation <br />Field implementation of the re-elevation (or re-leveling) program will require either (1) pre- <br />ballasting of the Energy Spur in advance of undermining followed by periodic survey of the <br />alignment during undermining, or (2) re-leveling the Energy Spur during undermining. <br />Additional detailed remedial planning work will be carried out prior to each panel undermining <br />the track. Tasks will include: <br />1. Quantifying ballast requirements. The amount of material required for re-leveling will be <br />estimated from the existing ballast cross-sections and predicted subsidence. <br />• 2. Making drainage provisions. Surface water drains alongside each side of the track to <br />culverts placed at strategic locations. These culverts must be lengthened during track re- <br />ballasting, the additional length being determined based on the required increase in ballast <br />height. <br />3. In the case of Option (1), evaluating pre-placement of the Ballast. This involves assessing <br />whether pre-ballasting will result in unacceptable track gradients prior to and during <br />undermining. <br />4. Additional Work and Data requirements <br />4.1 Evaluation of Fill Slope Stability at Fish Creek Crossinos <br />Track elevation may be accomplished in the creek crossing areas by locally steepening the fill <br />slopes above the creek if the existing fill geometry permits. Detailed survey will therefore be <br />required at each of the crossings to determine: culvert diameter and length, track position, <br />ballast prism shape, and fill prism shape. Sufficient survey data will be required to permit <br />construction of the sections shown on Figures 12, 15, and 18. <br />Concern was also raised regarding the effects of subsidence on the elevation of Fish Creek's <br />flow-line and the potential effects of an increase in surface water elevation on the stability of the <br />fill/ballast prism at the creek crossings. This concern is unwarranted at the crossing located <br />near the start room for 18-Right as subsidence will be limited by proximity to the start room. <br />• Resolution of this concern for the crossing over 17-Right awaits receipt and evaluation of the <br />detailed survey data noted above, and inspection of actual conditions at this location. We <br />
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