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2008-07-28_REPORT - C1996083 (2)
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2008-07-28_REPORT - C1996083 (2)
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Last modified
8/24/2016 3:35:00 PM
Creation date
7/29/2008 1:00:59 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1996083
IBM Index Class Name
REPORT
Doc Date
7/28/2008
Doc Name
2008 Bi-Annual Subsidence Report
From
J.E. Stover & Associates Inc
To
DRMS
Permit Index Doc Type
Subsidence Report
Email Name
JJD
Media Type
D
Archive
No
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Introduction <br />This report is for the period from January 2008 through June 2008. Mine Construction <br />of the Bowie No. 2 Mine began during May of 1997, with coal production beginning <br />during August 1997. <br />The mining permit application for the Bowie No. 2 Mine requires the operator to submit <br />the results of the subsidence monitoring programs and the results of the visual <br />inspections of known modern and historic landslides within the permit and adjacent <br />area for stability in June and December of each year and report these results to the <br />Division within 30 days of the ends of the reporting periods. <br />The operator is also required to inspect these landslides, both modern and historic, <br />monthly for six months immediately after retreat mining occurs. This same inspection <br />routine is applied to any spring or pond in the immediate proximity of retreat mining. <br />Longwall mining during the period included finishing the B-6 panel. Due to <br />development problems, the longwall has been idle from February 2008 to date. <br />Visual Inspection of known historic and modern landslides. <br />A visual inspection of all known historic and modern landslides was conducted during <br />June 23, 2008 by Brad Lindsay, Rock Logic Consulting LLC. Mr. Lindsay's report is <br />attached. Only two new subsidence cracks were noted. <br />Increased Inspection activity associated with retreat mining. <br />Accessible subsidence cracks are repaired during coal exploration events and are <br />monitored by both coal exploration supervisors and hydrologic monitoring technicians. <br />The accessible visual results of the subsidence effects associated with the Bowie No. 2 <br />Mine are overlain on Map 27-C Subsidence Features. Map 27-C is enclosed. During <br />this period, no hydrologic monitoring points were impacted or re-impacted by mining <br />activities. Potentially impacted or re-impacted means the mine workings or angle of <br />draw of the mine workings passed under the monitoring point during the reporting <br />period. No influence to any hydrologic monitoring points was observed during this <br />period. <br />Results of Subsidence Survey Monitoring <br />The results of the May 2008 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 an analysis of the subsidence survey data. Panel B-6 was <br />completed in January and February. Following is a summary of the survey data <br />collected during the period. There was no activity near Hubbard Creek or Dove Gulch. <br />There was no survey performed over the B-6 panel for the period. <br />2
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