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REP23325
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REP23325
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Last modified
8/24/2016 11:55:45 PM
Creation date
11/27/2007 3:40:45 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1996083
IBM Index Class Name
Report
Doc Date
5/5/2004
Doc Name
2003 Bi-Annual Subsidence Report
From
J.E. Stover & Associates
To
DMG
Permit Index Doc Type
Subsidence Report
Media Type
D
Archive
No
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. Introduction <br />This report covers the period from July 2003 through December 2003. Mine Construction of the <br />Bowie No. 2 Mine began during May of 1997, with coal production beginning during August <br />1997. Some additional information concerning the first half of 2003 is also included. <br />The mining permit application for the Bowie No. 2 Mine requires the operator to submit the <br />results of the subsidence monitoring programs and the results of the visual inspections of known <br />modern and historic landslides within the permit and adjacent area for stability in June and <br />December of each yeaz and report these results to the Division within 30 days of the ends of the <br />reporting periods. <br />The operator is also required to inspect these landslides, both modern and historic monthly for six <br />months immediately after retreat mining occurs. This same inspection routine is applied to any <br />spring or pond in the immediate proximity of retreat mining. <br />Visual Inspection of known historic and modern landslides. <br />A visual inspection of all known historic and modem landslides was conducted during November <br />2003 by J. E. Stover, 2768 Compass Drive, Suite 101, Grand Junction, CO 81506. On <br />November 19th a rock fall was noted along the Hubbazd Creek Road. It is located on USDA-FS <br />land downstream of Dove Gulch. The rock fall was most likely caused by mining in the D-9 panel. <br />No new or rejuvenated landslides were found during this inspection. These sites aze regulazly <br />• inspected by Bowie personnel during gob vent borehole construction and reclamation efforts. <br />Increased Inspection activity associated with retreat mining. <br />Accessible subsidence cracks were repaired during coal exploration events and are monitored by <br />both coal exploration supervisors and hydrologic monitoring technicians. The accessible visual <br />results of the subsidence effects associated with the Bowie No. 2 Mine are overlain on Map 27 - <br />Subsidence which is attached to this report. During this period, 9 hydrologic monitoring points <br />were potentially impacted or re-impacted by mining activities. Potentially impacted or re- <br />impacted means the mine workings or angle of draw of the mine workings passed under the <br />monitoring point during the yeaz. No influence to any of these hydrologic monitoring points <br />were observed during this period. <br />Results of Subsidence Survey Monitoring <br />The results of the November 2003 monitoring are attached. As in the past, the survey was <br />performed by Cragg Surveying using GPS methods. <br />Analysis of Subsidence Data <br />The following table presents actual subsidence compazed to predicted subsidence for selective <br />points near the center of longwall panels. See Volume III, Exhibit 15, for the method used to <br />predicted subsidence magnitude. In all cases, actual subsidence is less than predicted subsidence. <br />• The graph below the table shows the subsidence profile across panel D-4. <br />No data are available to verify the 25 degree angle of draw. <br />
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