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Supplemental Geotechnical Engineering Report Terracon <br />Proposed Slurry Cut-off Walls @ St. Vraln Development <br />Weld County, Colorado <br />Terracon Project No. 25045300 <br />TABLE OF CONTENTS <br />Page No. <br />Letter of Transmittal ...............................................................................................................ii <br />INTRODUCTION .......................................................................................................... ........1 <br />PROPOSED CONSTRUCTION .................................................................................... ........1 <br />SITE EXPLORATION ................................................................................................... ........2 <br />Field Exploration ..................................................................................................... ........ 2 <br />SITE CONDITIONS ...................................................................................................... ........ 4 <br />SUBSURFACE CONDITIONS ...................................................................................... ........ 4 <br />Geology .................................................................................................................. ........ 4 <br />Soil and Bedrock Conditions ................................................................................... ........4 <br />Field and Laboratory Test Results .......................................................................... ........ 5 <br />Groundwater Conditions ......................................................................................... ........ 5 <br />ENGINEERING ANALYSES AND RECOMMENDATIONS .......................................... ........ 6 <br />Slurry Walt Cut-Off Design and Construction Considerations .................................. ........ 6 <br />Potential Borrow Sources ........................................................................................ ...... 10 <br />Slurry Wall Alignment Considerations ..................................................................... ...... 11 <br />Embankment, Island, Peninsula, and Swim Beach Construction Considerations.... ...... 11 <br />GENERAL COMMENTS .............................................................................................. ......12 <br />BORING LOCATION MAP .......................................... <br />BEDROCK ELEVATION MAPS .................................. <br />PRELIMINARY SLURRY WALL ALIGNMENT MAP .. <br />APPENDIX A: LOGS OF BORING <br />APPENDIX B: LABORATORY TEST RESULTS <br />APPENDIX C: GENERAL NOTES <br />Figure No. <br />.......................................................1 <br />...........................................2 and ZA <br />....................................................... 3 <br />iv <br />