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REP04281
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Entry Properties
Last modified
8/24/2016 11:35:26 PM
Creation date
11/26/2007 10:45:00 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981038
IBM Index Class Name
Report
Doc Date
5/2/2001
Doc Name
2000 ANNUAL SUBSIDENCE REPORT
Permit Index Doc Type
SUBSIDENCE REPORT
Media Type
D
Archive
No
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. Station 82 Grosse-Rhode Ranch Site. This station was created in 1996 by UTE Engineering <br />and Surveying Company to replace previous Station 96. Discrepancies concerning <br />stations 94, 96, 97 and 98 required new stations to be established. The 2000 <br />survey data indicates an elevation gain of 0.21 feet when compared to the 1999 <br />elevation. <br />Station 83 Grosse-Rhode Ranch Site. This station was created in 1996 by UTE Engineering <br />and Surveying Company to replace previous Station 97. Discrepancies conceming <br />stations 94, 96, 97 and 98 required new stations to be established. No survey data <br />was reported for this site during 1998. The 2000 survey data indicates an <br />elevation gain of 0.37 feet when compared to the 1999 survey. <br />Pitltin Mesa Pipeline <br />Seven subsidence monitoring stations were established at locations along the Pitkin Mesa Pipeline <br />which overlies Panel C. Panel C development commenced in October with twenty-four crosscuts <br />completed by January 1, 1993. Panel C was mined utilizing a partial extraction design intended to <br />preclude the development of subsidence in order to protect the pipeline. The subsidence <br />monitoring stations along the pipeline are depicted on Map No. 2-SA. The stations were <br />surveyed twice in 2000; June 23 and December 4. The results of these surveys aze appended to <br />this report. The 2000 survey was conducted by Cragg Surveying. The Cragg survey will provide <br />consistent survey values in the future which will show that this azea is stable. Surveys will <br />. continue approximately semi-annually until stability is documented. <br />Visual Monitoring 2000 <br />Visual subsidence monitoring is accomplished by periodic "walkovers" of recently mined azeas <br />within the present pertnit azea. Walkovers are generally done in conjunction with survey <br />monitoring due to the seasonal accessibility of the azea. During the 2000 monitoring season, <br />visual monitoring consisted of visual inspections done while performing survey monitoring and <br />water monitoring. <br />Visual monitoring is concentrated over azeas of retreat mining with particulaz emphasis on areas <br />mined under low overburden.. Since the mine has now been idled in excess of 2 yeazs, there aze <br />no areas of particular emphasis on which to concentrate visual inspections. <br /> <br />Projected Subsidence Impacts - 2001 <br />Subsidence impacts during 2001 aze projected to be minimal based upon subsidence patterns <br />established to date. No mining is currently projected for 2001. <br />Projected Subsidence Monitoring - 2001 <br />Per the conditions of Technical Revision 16, the operator is required to inform the Division of <br />selected sites proposed for surveying for the upcoming yeaz. For the calendar 2001 year, the <br />operator proposes the following twenty (20) sites for surveying (see Map No. 2-5 appended to <br />this report): 6, 14, 15, 16, and 95; Drill hole location 55, 65, 66 and 68; structure locations in the <br /> <br />-4- <br />
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