2011-01-04_PERMIT FILE - C1981012

• Permit No: C1981012
• IBM Index Class Name: Permit File
• Doc Date: 1/4/2011
• Doc Name: DEVELOPMENT WASTE DISPOSAL AREA DESIGN
• Section_Exhibit Name: Exhibit 37 Development Waste Disposal Area Design
• Media Type: D
• Archive: No

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