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Draft: August 23, 2010 Page i <br />DRAFT <br />DESIGN RECOMMENDATIONS FOR <br />THE DEVELOPMENT WASTE DISPOSAL AREA, <br />NEW ELK MINE, WESTON, COLORADO <br />TABLE OF CONTENTS <br />Page <br />1.0 INTRODUCTION .................................................................................. ..............................1 <br />2.0 SITE INVESTIGATIONS ..................................................................... ..............................1 <br />3.0 LABORATORY TESTING ................................................................... ..............................4 <br />4.0 COMPUTER MODELING ................................................................... ..............................4 <br />5.0 RECOMMENDATIONS ...................................................................... .............................11 <br />LIST OF TABLES <br />Table 1. Laboratory Test Results ............................................................. ..............................4 <br />Table 2. Factors of Safety for Various Slope Conditions ........................ ..............................4 <br />Table 3. Recommended Construction Criteria ........................................ .............................11 <br />LIST OF FIGURES <br />Figure 1. <br />Proposed Development Waste Disposal Area with Drill Holes ..............................1 <br />Figure 2. <br />DH -6 Boring Log with Blow Count Information ...................... ..............................3 <br />Figure 3. <br />Coal Pond Refuse 2.0:1.0 Slope —Water Table at Surface ....... ..............................5 <br />Figure 4. <br />Coal Pond Refuse 1.5:1.0 Slope —Water Table at Surface ....... ..............................5 <br />Figure 5. <br />Coal Pond Refuse 1.0:1.0 Slope —Water Table at Surface ....... ..............................6 <br />Figure 6. <br />Mine Development Waste 2.0:1.0 Slope —Water Table at Surface ........................6 <br />Figure 7. <br />Mine Development Wate 1.5:1.0 Slope —Water Table at Surface ..........................7 <br />Figure 8. <br />Mine Development Waste 1.0:1.0 Slope —Water Table at Surface ........................7 <br />Figure 9. <br />Alternating Coal Pond Refuse and Mine Development Waste, Pond Refuse <br />Base 1.5:1.0 Slope —Water Table at Surface ............................. ..............................8 <br />Figure 10. <br />Alternating Coal Pond Refuse and Mine Development Waste, Development <br />Waste Base 1.5:1.0 Slope —Water Table at Surface .................. ..............................8 <br />Figure 11. <br />Mine Development Waste 1.5:1.0 Slope —Water Table at Surface ........................9 <br />Figure 12. <br />Mine Development Waste 1.5:1.0 Slope —Water Table at 10 ft .............................9 <br />Figure 13. <br />Mine Development Waste 1.5:1.0 Slope —Water Table at 20 ft ...........................10 <br />Figure 14. <br />Mine Development Waste 1.5:1.0 Slope —Water Table at 30 ft ...........................10 <br />LIST OF PHOTOS <br />Photo 1. DH -6 Location with Typical Coal Refuse from Pond Cleaning ..............................2 <br />Photo 2. Typical Mine Development Waste from Current Waste from Current Mine <br />Rehabilitation............................................................................. ..............................2 <br />Agapito Associates, Inc. <br />