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• Station 95 Station 95 is located at the North quarter-comer of Section 15. The elevation of <br />Station 95 was defined by satellite survey in July 1992 at 8415.4 feet. Panel Y <br />development occurred east of Station 95 during July 1993. Station 95 was re- <br />surveyed inJanuary 1994 and showed a 0.76 foot elevation loss. It is not apparent <br />whether this elevation change is associated with subsidence or the difference in <br />survey techniques. Cover in the vicinity of Station 95 is approximately 155,0 feet <br />and subsidence of this degee would not be anticipated in this area particularly <br />prior to retreat mining operations. Station 95 was pillared under in September or <br />October 1994. The October 1994 survey indicates a minor (0.08 foot) loss in <br />elevation compared to the January 1994 survey. The 1997 survey performed by <br />UTE Engineering shows a loss of 0.55 feet. <br />Station 99 Station 99 is located at the Northwest comer of Section 15. The elevation of <br />Station 99 was defined by satellite survey in July 1992 at 7921.9 feet. Station 99 <br />was re-surveyed in January 1994 and showed a 0.96 foot elevation loss. The June <br />1995 survey performed by UTE Engineering checked within 0.01 feet of the <br />satellite survey. The 1996 average showed a dmp in elevation of 1.55 feet. <br />However, the 1997 survey indicates an increase in elevation of 1.56 feet, and <br />returns this point to the 1992 elevation. Based on the iTTE survey, station 99 <br />appears to be stable. Cover in the vicinity of station 99 is approximately 1200 <br />feet. Mining has not been performed in the vicinity of station 99. <br />• Station 81 Grosse-Rhode Ranch Site. This station was created in 1996 by iJTE Engineering <br />and Surveying Company to replace previous Station 94. Discrepancies concerning <br />stations 94, 96, 97 and 98 required new stations to be established. The 1997 <br />survey data indicates an elevation loss of .31 feet. <br />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 1997 <br />survey data indicates an elevation loss of .Ol feet. <br />Station 83 Grosse-Rhode Ranch Site. This station was created in 1996 by UTE Engineering <br />aad Surveying Company to replace previous Station 97. Discrepancies concerning <br />stations 94, 96, 97 and 98 required new stations to be established. No survey data <br />was reported for this site during 1997. <br />Pitldn 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 />colleted by January 1, 1993. Panel C was mined utilizing a partial extraction design intended <br />to preclude the development of subsidence in order to protect the pipeline. The subsidence <br />• -4- <br />