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REP01309
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Entry Properties
Last modified
8/24/2016 11:31:37 PM
Creation date
11/26/2007 9:55:42 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981038
IBM Index Class Name
Report
Doc Date
12/11/2002
Doc Name
1993 ANNUAL SUBSIDENCE REPORT
Permit Index Doc Type
SUBSIDENCE REPORT
Media Type
D
Archive
No
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east of this location occurred during December, 1993. 'ffiic <br />• station overlies approximately 2100 feet of overburden. The <br />monitoring point established at this site was surveyed <br />DecernbeY' 8, 1993 at elevation 8813.00. <br />Station 98: Station 98 was newly established in 1993 and is located at the <br />(YOSSe-Rhode biu~khouse cabin identified as struct~,ae 34 on <br />permit No. C-81-038; Map No. 9-7. Advance mining of Panel Y <br />in the vicinity of this location ooctu2ed during Decanter, <br />1993. 'ibis station overlies approximately 2050 feet of <br />overburden. The monitoring point established at this site was <br />surveyed Decanter 8, 1993 at elevation 8758.07. <br />Station 99: Station 99 is located at the Northwest corner of Section 15. <br />The elevation of station 99 was defined by satellite survey in <br />July, 1992 as 7921.9 feet. No mining occurred in the vicinity <br />of station 99 during 1993. Station 99 was resurveyed in <br />January 1994 and showed a 0.96 feet elevation change. it is <br />not apparent whether this elevation change is associated with <br />true movement or the difference in survey techniques. Cover <br />in the vicinity of Station 99 is approximately 1200 feet. <br />Pitkin Mesa Pipeline Subsidence Monitoring Summary <br />Seven subsidence monitoring stations were established at locations along the <br />Pitkin Mesa Pipeline which overlies Panel C. Panel C development cwmnPnced in <br />• October with twenty four crosscuts completed by January 1, 1993. Panel C was <br />completed in April, 1993. Panel C was mined utilizing a partial extraction <br />design intended to preclude the development of subsidence in order to prated the <br />pipeline. 'Ihe subsidence monitoring stations along the pipeline are depicted on <br />Map No. 2-5A, Permit No. C-81-038. The stations were surveyed twice in 1993; May <br />21 and Oc.-tober 14. Results of both surveys are appendgi to this report. In <br />general, all sites show an elevation gain of approximately 0.2 to 0.3 feet based <br />upon the 1993 survey information. Surveys will continue on an approximately <br />semi-annually until stability is doamiented. <br />Visual Monitoring 1993 <br />Visual subsidence monitoring is accomplished by periodic "walkovers" of recently <br />mined areas within the present permit area. Walkovers are generally done in <br />conjunction with survey monitoring due to the seasonal accessibility of the area. <br />Visual monitoring is concentrated over areas of retreat minim with particular <br />emphasis on areas mined under low overburden. <br />A visual walkover inspection of recerrt.ly pillared areas (Panels A, A+, B, and C) <br />was conducted in conjunction with subsidence and hydrology monitoring in the area <br />during October, 1993. No visual evidence of subsidence was noted in any of these <br />areas. <br />Projected Stabsideace ~apacts 1994 <br />. SUisidence impacts during 1994 are projected to be minimal based upon subsidence <br />patterns established to date. Mining during 1994 is projected to occur in panels <br />Z and 1st North Fast. Development and retreat mining is scheduled to occur in <br />6 <br />
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