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1994 Subsidence Report <br />Page 5 <br />foot) gain in elevation ca:q~ared to the January 1994 survey. <br />Station DH 68: Drill hole 68 is located over Panel Z with approximately 1250 <br />feet of cover. Advance mining occurred directly under DH 66 <br />in October 1993. The collar elevation of DH 68 was <br />originally established in 1982 at 8191.92 feet. The <br />ironitoring point established at this site was surveyed in <br />January 1994 at elevation 8191.53 (-0.39 feet). The October <br />1994 survey indicates a minor (0.02 foot) loss in elevation <br />compared to the January 1994 survey. <br />Station 94: Station 94 was newly established in 1993 and is located at <br />the Gmsse-Rhode cabin identified as structure 32 on perniit <br />No. C-81-036; Map No. 9-7. Advance mining of Panel Y in the <br />vicinity occurred during December 1993 and retreat mining <br />occurred in early 1994. This station overlies approximately <br />2000 feet of overburden. The monitoring point established at <br />this site was surveyed December 8, 1993 at elevation 8755.95. <br />The Ortober 1994 survey indicates an elevation loss of 0.17 <br />feet compared to the December 8, 1993 survey. <br />Station 95: Station 95 is located at the North quarter~orner of Section <br />15. The elevation of Station 95 was defined by satellite <br />• survey in July 1992 at 8415.4 feet. Panel Y development <br />occurred east of Station 95 during July 1993. Station 95 was <br />re-surveyed in January 1994 and shaved a 0.76 foot elevation <br />loss. It is not apparent whether this elevation change is <br />associated with subsidence or the difference in survey <br />techniques. Cover in the vicinity of Station 95 is <br />approximately 1550 feet and subsidence of this degree would <br />not be anticipated in this area particularly prior to retreat <br />mining operations. Station 95 was pillared under in <br />September or O-~tober 1994. The October 1994 survey indicates <br />a minor (0.08 foot) loss in elevation c®:~ared to the January <br />1994 survey. <br />Station 96: Station 96 was newly established in 1993 and is located at <br />the Grosse-Rhode gazage identified as structure 33 on permit <br />No. C-81-038; Map No. 9-7. Advance mining of Panel Y in the <br />vicinity occurred during December 1993 and retreat mining <br />occurred in early 1994. This station overlies approximately <br />2000 feet of overburden. The monitoring point established at <br />this site was surveyed December 8, 1993 at elevation 8733.03. <br />The October 1994 survey indicates an elevation gain of 0.49 <br />feet caiq~ared to the December 8, 1993 survey. <br />Station 97: Station 97 was newly established in 1993 and is located at <br />the Grosse-Rhode A-frame cabin identified as structure 35 on <br />permit No. C-81-036; Map No. 9-7. Advance mining of Panel Y <br />east of this locating occurred during December 1993 and <br />` retreat mining occurred in early 1994. This station overlies <br />