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REP14668
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REP14668
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Last modified
8/24/2016 11:44:28 PM
Creation date
11/27/2007 1:29:06 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981038
IBM Index Class Name
Report
Doc Date
7/10/2000
Doc Name
1999 ANNUAL SUBSIDENCE REPORT
Permit Index Doc Type
SUBSIDENCE REPORT
Media Type
D
Archive
No
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.~ Station 83 Grosse-Rhode Ranch Site. This station was created in 1996 by UTE Engineering <br />and Surveying Company [o replace previous Station 97. Discrepancies <br />concerning stations 94, 96, 97 and 98 required new stations to be established. No <br />survey data was reported for this site during 1998. The 1999 survey data indicates <br />an elevation loss of 0.38 feet when compazed to the June 1996 survey. <br />Pitkin Mesa Pipeline <br />Seven subsidence monitoring stations were established at locations along the Pitkin Mesa <br />Pipeline which overlies Panel C. Panel C development commenced in October with twenty-four <br />crosscuts completed by January 1, 1993. Panel C was mined utilizing a partial extraction design <br />intended to preclude the development of subsidence in order to protect the pipeline. The <br />subsidence monitoring stations along the pipeline aze depicted on Map No. 2-SA. The stations <br />were surveyed twice in 1999; June 17 and September 29. The results of these surveys aze <br />appended to this report. The 1999 survey was conducted by Cragg Surveying. The Cragg survey <br />will provide consistent survey values in the future which will show that this azea is stable. <br />Surveys will continue approximately semi-annually until stability is documented. <br />Visual Monitoring 1999 <br />Visual subsidence monitoring is accomplished by periodic "walkovers" of recently mined azeas <br />within the present permit azea. Walkovers aze generally done in conjunction with survey <br />monitoring due to the seasonal accessibility of the azea. During the 1999 monitoring season, <br />visual monitoring consisted of visual inspections done while performing survey monitoring and <br />water monitoring. <br />Visual monitoring is concentrated over areas of retreat mining with particular emphasis on areas <br />mined under low overburden. Since the mine has now been idled in excess of 2 years, there are <br />no areas of particulaz emphasis on which to concentrate visual inspections. <br />Projected Subsidence Impacts - 2000 <br />Subsidence impacts during 2000 aze projected to be minimal based upon subsidence patterns <br />established to date. No mining is currently projected for 2000. <br />Projected Subsidence Monitoring - 2000 <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 1998 year, the <br />operator proposes the followin thirteen (13) sites for surveying (see Map No. 2-5 appended to <br />this report): 6, 14, 15, 16, 88, 89, 90, 90 d 95; Drill hole location 55, 65, 66 and 68'; structure <br />locations in the north %: o ection which will be denoted subsidence monitoring points 81, 82 <br />and 83; and the comer of Sections 9, 10, 15 and 16 designated as point 99. These sites will be <br />surveyed once during the year. <br />In addition, the operator will survey the seven (7) Pitkin Mesa Pipeline monitoring locations <br />• sem-annually until stability is documented. <br />-4- <br />
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