June 2022 G-01483.84-017-R-Rev0 ii Table of Contents 1.0 INTRODUCTION .........................................................................................................................................1 1.1 Overview ..........................................................................................................................................1 1.2 Previous Work ..................................................................................................................................3 1.3 Scope of Work..................................................................................................................................3 1.4 Site Visits .........................................................................................................................................3 1.5 Units of Measure ..............................................................................................................................3 1.6 Co-ordinate System .........................................................................................................................3 2.0 RELIANCE ON OTHER EXPERTS ............................................................................................................4 3.0 SITE DESCRIPTION AND LOCATION ......................................................................................................4 4.0 GENERAL GEOLOGY................................................................................................................................6 5.0 GEOTECHNICAL FIELD PROGRAM ........................................................................................................6 5.1 Laboratory Soil and Rock Testing ....................................................................................................7 5.1.1 Test Results Summary..............................................................................................................11 5.1.2 Shear Vane Testing ..................................................................................................................15 5.1.3 Unconfined Compressive Strength Testing ..............................................................................17 5.2 Summary of Geotechnical Characteristics of Soils at Willows Road Farm ...................................20 6.0 WILLOWS ROCK STACK ........................................................................................................................20 6.1 Description of Rock Storage Facilities ...........................................................................................20 6.2 Geotechnical Assessment of WRS Stability ..................................................................................21 6.3 Material Properties .........................................................................................................................21 6.4 Groundwater ..................................................................................................................................23 6.5 Stability Assessment ......................................................................................................................24 6.6 Design Criteria ...............................................................................................................................24 6.7 WRS Cross-Sections .....................................................................................................................24 6.8 Results of Stability Analyses ..........................................................................................................24 6.8.1 Static Stability Analyses – Short-Term Case ............................................................................24 6.8.2 Seismic Stability........................................................................................................................25 6.9 Conclusions and Implications for WRS Design .............................................................................25 6.10 WRS Design Assessment ..............................................................................................................26
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