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L L L L L L L L � <br />` Y _ , ' _ 4 • • i - ` • _ , 4� • • ' - Y • • ' 4� • • ` - V • • 4'•, • ' - Y • 4� • 1 , - ~ Y • 4� • 1 ' - V • Y� • 3 , _ V • -r •� • L ' _ • _ • .. _ <br />ON • L Y • _. 4`, • ' - Y • • , M <br />fYi <br />- • y .n -. • •n _. • y • - • y rn - • •n - • •n - • . - • •n - • 4 •n - - • •n _ - • y rn <br />•.+ • ' t:vA • ' .v KA r .._ +A • .?,v +A r .--xvA r .tv +A r ' v< • • r <br />\ \ \ \ \ \ \ \ \ \ \ <br />I • ` I • - I - I • ` I • ` I ` I • ` I • ` I • - I • - I • <br />_ _ 1 _ • _ _ _ V V V V <br />• I <br />I <br />I <br />I <br />1 'I <br />1 <br />i <br />I <br />I <br />I <br />- I <br />7700 <br />I� 7700 <br />I 1 <br />I <br />7650 <br />6r I <br />7650 <br />I <br />7600 _ <br />- -_— - -- 7600 <br />P OPOSED POST-MINE CONTOURS 7550 <br />—7550 <br />I 7550 <br />WOLF CREEK COAL SEAM {{ <br />I �— <br />_ <br />7500 7500 I r <br />ORIGINAL GROUND SURFACE <br />7450 <br />PROPOSED WOLF CREEK UNDERDRAIN 7450 <br />7400 <br />7400 <br />' I <br />7350 <br />7350 <br />NOTE WORST CIRCLE LOCATED BY AUTOMATIC <br />SEARCH AFTER GRID SEARCH IS COMPLETED <br />7300 <br />— CENTER OF WORST CIRCLE AT DISTANCE = 888.334; - <br />ELEVATION= 8420', RADIUS= 1391.303', F x 1.70 <br />_ — RESULTS OF CIRCULAR FAILURE ANALYSIS <br />7250 <br />_ — — — PORE PRESSURE FACTOR OF SAFETY FACTOR OF SAFETY <br />— ' RATIO STATIC CASE SEISMIC CASE 7250 <br />' <br />i <br />0 0 3 15 242 1 <br />7200 � I y _ - - - -! <br />01 2 91 203 <br />------- - - - - -- 02 2 42 1 85 7200 <br />I <br />0 2 17 1 67 <br />0 CSATUftATION) 194 148 <br />7150 + o S (100% SATURATION) I 70 30 7150 <br />7100 <br />_ _ - - -- I Permit Number # C- 1980 -005 <br />Class Permit , <br />— I Section /Exhibit 1, a E <S�l L� I <br />7050 <br />— <br />7050 <br />PROPOSED POST -MINE CONTOURS _ - -- — — — — — <br />PROPOSED WOLF CREEK UNDERDRAIN -- l —1 - --- I <br />7000 <br />-- __— r------ - - - - -- ORIGINAL GROUND SURFACE _ 7000 <br />6950 <br />e <br />6950 <br />I <br />r r I (r 1 ,eew <br />6900 I i ••� ti <br />6900 <br />0 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 3000 3200 3400 3600 3800 4000 4200 4400 4600 <br />I <br />I <br />I <br />i <br />ENGINEERS CERTIFICATION I <br />EXH I BIT ° 12 -ES2" <br />I I, <br />SLOPE S•IiABILITY CROSS SECTION <br />I, Richard A. Isaac of Aurora, Colorado hereby certify thatl S E N ECA II MINE <br />this drawing was prepared under my direction and that infor. SENECA CDAL LTD 12015 E. 46th AVE. DENVER, COLORADO 80239 <br />matron contained thereon is correct, to the best of my DESIGNED BYsR A I NOMIL WALE, I " =50' <br />knowledge and belief. DRAMN nY= D E F VEm• WALE• I "= 50' <br />CHECKED UP A I IMAV"I'D DATE• 9 -12 -85 <br />Colorado P. E. No. 20320 RE 1310NS <br />1 <br />I y Richard A. Isaac Date: 6664866 <br />I <br />SEP 241987 <br />MINED LAND <br />—' RECLAMATtON DI�°Iq'ON <br />