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Station 16 Station 16 overlies approximately 950 feet of overburden. Surveys at station 16 <br />• were initiated in August, 1982 and continued biannually through 1984. Annual <br />surveys occurred in 1992 - 1994. The 1st North - 3 West panel adjacent to and <br />east of station 16 was retreat mined m October 1981. Panel A, located beneath <br />station 16 was retreat mined in July and August, 1991. The 1997 survey data <br />indicates a 0.09 ft. elevation loss at this site cornpazed to the 1996 data. Station <br />16 is located within a mapped landslide azea as well and some minor coordinate <br />variability has been recorded. <br />Station DH55 Drill hole 55 is located over Panel Z with approximately 1750 feet of cover. Panel <br />Z was retreated mined in the vicinity of DH 55 in July 1994. The collaz elevation <br />of DH 55 was originally established in 1981 at 8578.57 feet. The monitoring point <br />established at this site was surveyed in January 1994 at elevation 8543.11 (-35.46 <br />feet). An appazent error in survey elevation data exists for this site. The October <br />1994 survey indicates a minor (0.07 foot) gain in elevation compazed to the <br />January 1994 survey. The June 1997 survey indicates a loss of 0.33 ft when <br />compazed to the 1996 elevation. <br />Station DH65 Drill hole 6 5 is located over the I" East Main in the west thick coal pod with <br />approximately 1380 feet of cover. In May 1994 the I" East Mains were advanced <br />under DH 65. During 1995 retreat mining occurred both north and south of DH <br />65. The October 1994 survey indicates a minor (0.13 foot) gain in elevation <br />• compared to the January 1994 survey. The 1997 average survey performed by. <br />UTE Engineering shows a decrease 0.28 feet in elevation. <br />Station DH66 Drill hole 66 is located over Panel ZZ- I North in the west thick coal pod with <br />approximately 1290 feet of cover. Advance mining occurred under DH 66 during <br />May 1995 and retreat mining occurred during July or August 1995. The collar <br />elevation of DH 66 was originally established in 1982 at 8209.89 feet. The <br />monitoring point established at this site was surveyed in January 1994 at elevation <br />8189.50 (-20.39 feet). An appazent error in survey elevation data exists for this <br />site. The October 1994 survey indicates a minor (0.07 foot) gain in elevation <br />compared to the January 1994 survey. The 1997 survey performed by iITE <br />Engineering shows a decrease m elevation of 0.28 feet. <br />Station DH68 Drill hole 68 is located over Panel Z with approximately 1250 feet of cover. <br />Advance mining occurred dvectly under DH 68 in October 1993. The collar <br />elevation of DH 68 was originally established in 1982 at 8191.92 feet. The <br />monitoring point established at this site was surveyed in January 1994 at elevation <br />8191.53 (-0.39 feet). The October 1994 survey indicates a minor (0.02 foot) loss <br />in elevation compazed to the January 1994 survey. The 1997 survey performed by <br />UTE Engmeermg shows a decrease in elevation of 0.5 feet. <br />. -3- <br />