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' SubTerra, Inc. Twentymile Coal Company 5/23/99 <br />Northern Mining District Rockfall Hazards Evaluation <br />,, 1. INTRODUCTION ...........................................................................................................................................1 <br />' I.I BACKGROUND ................................................................................................................................................1 <br />1.2 SCOPE OF WORK ...................:........................................................................................................................ l <br />' 1.3 REPORT CONT'ENTS .........................................................................................................................................2 <br />2. SUMMARY OF THE PRIOR PHASE 1 RESULTS .....................................................................................2 <br />' 2.l SLOPE MORPHOLOGY .....................................................................................................................................2 <br /> 2.2 STRUCTURAL REGIMES AND BOULDER CHARACTERISTICS ............................................................................ 2 <br />' 1.1. / Scanline Survey ...................................................................................................................................... 2 <br /> 1.1.1 Boulder Survey ....................................................................................................................................... 3 <br />' 2.3 BLOCK SIZE .................................................................................................................................................... 3 <br /> 2.4 CRSP3 PARAMETERS ...................................................................................................................................... 4 <br /> 2.5 DAMAGE TO THE CLIFF M THE PHASE I STUDY AREA <br />. <br />...................................... 6 <br />' ............................................ <br />. <br /> 3. P ARAMETER SELECTION FOR THE NORTHERN MINING DISTRICT .......................................... 6 <br />' 4. ROCKFALL HAZARD EVALUATION AND MITIGATION ...................................................................7 <br />5. REFERENCES .................................................................................................................................................7 <br />1 <br /> <br />1 <br />1 <br />1 <br /> <br />1 <br /> <br />PN: 9915 <br />