Laserfiche WebLink
`y~ -.aI <br />f `: T. <br />• • buffer zone. Panel B was retreat mined with partial floor extraction <br />during May ] 992 in the immediate vicinity of station 15. May 1996 <br />-survey results showed an average elevation loss of 0.43 feet as <br />compared to the original January 1992 average. <br />Station 16: Station 16 overlies approximately 950 feet of overburden. Surveys at <br />station 16 were initiated in August, 1982 and continued bi-annually <br />through 1984. Annual surveys occurred in 1992 - 1994. The 155 North <br />- 3 West panel adjacent to and east of station 16 was retreat mined in <br />October 1981. Panel A, located beneath station 16 was retreat mined <br />in July and August, ] 991. The 1996 survey data indicates a 0.5 ft. <br />eleva ion loss at this site compared to the 1995 data. Station 16 is <br />~... <br />located within a mapped landslide area as well and some minor <br />coordinate variability has been recorded. <br />Station DH 55: Drill hole 55 is located over Panel Z with approximately 1750 <br />feet of cover. Panel Z was retreated mined in the vicinity of DH <br />55 in July 1994. The collar elevation of DH 55 was originally <br />• established in 1981 at 8578.57 feet. The monitoring point <br />established at this site was surveyed in Jarn~ary 1994 at elevation <br />8543.11 (-35.46 feet). An apparent error in survey elevation <br />data exists for this site. The October 1994 survey indicates a <br />minor (0.07 foot) gain in elevation compared to the January <br />1994 survey. The June 1996 showed an average gain of 0.43 ft.. <br />Station DH 65: Drill hole 65 is located over the 15` East Main in the west thick <br />coal pod with approximately 1380 feet of cover. In May 1994 <br />the 15` East Mains were advanced under DH 65. During 1995 <br />retreat mining occim ed both north and south of DH 65. The <br />October 1994 survey indicates a minor (0.13 foot) gain in <br />elevation compared to the January 1994 survey. The 1996 <br />average survey performed by UTE Engineering showed an <br />increase 0.43 feet in elevation. <br />Station DH 66:. Drill hole 66 is located over Panel ZZ-1 North in the west thick <br />coal pod with approximately 1290 feet of cover. Advance <br />mining occurred under DH 66 during May 1995 and retreat <br /> <br />Page -5- <br />.~ <br />