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PERMFILE103730
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PERMFILE103730
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Entry Properties
Last modified
8/24/2016 9:57:11 PM
Creation date
11/24/2007 10:21:37 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980007
IBM Index Class Name
Revision
Doc Date
12/2/2004
Doc Name
2.05.5 Post-Mining Land Uses
Type & Sequence
PR10
Media Type
D
Archive
No
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West Elk Mine <br />• or blockage of the trails on roads. MCC will repair or replace these items as discussed later in this <br />section. <br />Subsidence Monitorine Plan - 2.05.6 (6)(b)(ii). (6)(c)(il and (6)(e)(iii) <br />Until 1999, subsidence monitoring at West Elk Mine was accomplished using conventional <br />survey methods of a monument grid. The grid was laid out over the first three longwall panels to <br />be mined (panels 1-3NW), and successfully verified MCC's prediction about the amount of <br />subsidence. The grid is shown on Map 29. As subsidence of the three longwall panels was <br />completed and the surveys no longer showed movement, monitoring of the grid was discontinued <br />in 1999. However, the monuments have remained in place to be surveyed in the event that any <br />unanticipated ground surface displacement occurs in the vicinity of the monuments. <br />In the Jumbo Mountain permit revision application (PROS), MCC proposed measuring <br />subsidence using aerial photogrammetric methods. MCC had been collecting data from aerial <br />flights since 1995. Areas were flown prior to, during, and following mining. MCC has <br />evaluated this data and determined that measuring subsidence using aerial methods is not <br />feasible for a number of reasons. The fast is the rugged topography of the azeas that are <br />undermined makes it difficult to place survey panels and interpret the data. In addition, placing <br />an adequate number of survey panels has also been difficult due to limited access and thick <br />vegetation. Another difficulty, particularly on Jumbo Mountain, is that it is difficult to <br />distinguish between actual subsidence and ground movement due to landsliding. <br />• The monitoring of MCC's subsidence grid established the amount of subsidence that occurs over <br />a longwall panel, when it occurs, where it occurs, and when it is complete; therefore, there is no <br />longer a need for additional grids. Instead, MCC will visually inspect the ground over the areas <br />that have been undermined to document any disturbance that may have occurred. MCC will also <br />visit new mine azeas prior to any subsidence occurrence to document pre-existing conditions, and <br />will also visit locations where cracks have previously been documented to verify that the cracks <br />aze healing. MCC will utilize traditional survey methods, as necessary, to evaluate structures of <br />concern, for example, Dry Fork. Specific subsidence monitoring measures and plans will be <br />developed, submitted for CDMG review and approval, and then implemented for Dry Fork <br />to address potential subsidence-related impacts in the area. MCC will conduct visual <br />surveys, and any necessary traditional surveys, in the summer months of each yeaz and provide <br />the information in a written report by the end of September each yeaz. Monitoring of Dry Fork <br />will be more frequent as mining approaches the stream. A summary of the observations and <br />monitoring will be provided in a quarterly letter report to CDMG and to the USFS. If any <br />mechanical response is detected during these visual inspections that is not consistent with what <br />has been previously observed, MCC will notify CDMG within ten working days of our <br />observations. <br />The annual reports of the visual surveys will include photographs to document any subsidence <br />features, including cracks, rockfalls, landslides, revegetation, and other relevant features. A map <br />will also be included that identifies the location of the photographer and the aspect of the image <br />for each photograph. An additional map will be prepazed that identifies the location and extent <br />• of the observed features. MCC will attempt to revisit previously identified subsidence features <br />2.05-194 Revised November1004PR10 <br />
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