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April 16, 2012 <br />DESIGN RECOMMENDATIONS FOR THE <br />PROPOSED WEST PORTAL DEVELOPMENT <br />WASTE ROCK DISPOSAL AREA (DWDA), <br />NEW ELK MINE, WESTON, COLORADO <br />TABLE OF CONTENTS <br />Page i <br />Page <br />1.0 INTRODUCTION .................................................................................. ..............................1 <br />1.1 Purpose and Scope ..................................................................... ..............................1 <br />1.2 Limitations of Report ................................................................. ..............................1 <br />2.0 SITE LOCATION, SURFACE CONDITIONS AND HAZARDS ....... ..............................3 <br />2.1 Surface Conditions ..................................................................... ..............................3 <br />Geologic and Man -Made Hazards ......................................................... ..............................3 <br />3.0 FIELD INVESTIGATION .................................................................... ..............................5 <br />3.1 Field Investigation Program ....................................................... ..............................5 <br />3.2 Subsurface Conditions ............................................................... ..............................5 <br />4.0 LABORATORY TESTING ................................................................... ..............................6 <br />5.0 COMPUTER -AIDED MODELING AND ANALYSIS ........................ ..............................9 <br />6.0 RECOMMENDATIONS ...................................................................... .............................10 <br />APPENDIXA— BORING LOGS .............................................................. ............................... A -1 <br />DISCLAIMER: This report contains professional opinions based on information provided by <br />the Owner. AAI makes no warranties, either expressed or implied, as to the accuracy or <br />completeness of the information herein. Opinions are based on subjective interpretations of <br />geotechnical data; other equally valid interpretations may exist. Identification and control of <br />hazardous conditions are the responsibilities of the Owner. <br />Any conditions discovered during construction that seem to conflict with the contents of <br />this report should be brought to AAI's attention promptly so that modifications to the <br />recommendations can be made. In the event that any changes to design concepts and criteria in <br />AAI reports are made, AAI's conclusions and recommendations shall not be considered valid <br />until the changes are reviewed, conclusions are modified, and both are approved in writing by <br />AAL <br />The conclusions contained within this report were valid as of the date performed. <br />Changes in the condition of the site can occur with the passage of time as a result of either <br />natural processes or human activity in the area. Changes in the state of art of geotechnical and <br />engineering geology may affect the validity of the conclusions herein. No warranty, either <br />express or implied, is made or intended in connection with the work performed. <br />Agapito Associates, Inc. <br />