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Geotechnical Investigation Report Detroit Lake Water Reservoir Detroit, Oregon TABLE OF CONTENTS 1.0INTRODUCTION.........................................................................................................................1 1.1General................................................................................................................................1 1.2Proposed Construction.........................................................................................................1 1.3Field Exploration and Testing...............................................................................................1 2.0SITE AND SUBSURFACE CONDITIONS...................................................................................1 2.1Geologic Setting...................................................................................................................1 2.2Surface Conditions...............................................................................................................1 2.3Subsurface Conditions.........................................................................................................2 3.0SITE CONDITIONS.....................................................................................................................2 3.1Discussion............................................................................................................................2 3.2Foundation Design...............................................................................................................3 3.3Floor Slabs...........................................................................................................................4 3.4Reservoir/Retaining Wall Design Parameters......................................................................4 3.5Seismic Design Criteria........................................................................................................5 3.6Pavement Design.................................................................................................................5 4.0PERTINENT CONSTRUCTION RECOMMENDATIONS............................................................6 4.1Site Preparation...................................................................................................................6 4.1.1Proofrolling.....................................................................................................................6 4.1.2Wet Weather/Wet Soil Conditions..................................................................................6 4.2Excavation............................................................................................................................7 5.0CONSTRUCTION OBSERVATIONS..........................................................................................7 6.0LIMITATIONS..............................................................................................................................7 7.0RESTRICTIONS.........................................................................................................................8 8.0REFERENCES............................................................................................................................9 SUPPORTING DATA Appendix A – Figures Figure 1 Vicinity Map Figure 2 Site Exploration Plan Appendix B – Summary Logs and Laboratory Test Results Key to Test Pit and Boring Log Symbols Logs for Test Pits TP-1 thru TP-2 Atterberg Limit Test Results Summary of Laboratory Data Appendix C – Field and Laboratory Testing Figure C-1 Historical Seismicity Figure C-2 Site Fault and Fold Map Figure C-3 Crustal Model Response Spectra Figure C-4 Subduction Zone Intraslab Model Response Spectra Figure C-5 Subduction Zone Interface Model Response Spectra Appendix D – General Construction Information Table D-1 List of Applicable State and Local Regulations November 23, 2009 Project No. 72852.000 i