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Gravina Freight Dock Facility Geotechnical Data Report

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Gravina Freight Dock Facility Geotechnical Data Report April 2020 Prepared by: P N D ENGINEERS, INC. G r a v i n a F r e i g h t D o c k F a c i l i t y G e o t e c h n i c a l I n ve s t i ga t i o n Geo t ec h n i ca l Da t a Re p or t F i n a l Re p or t Prepared for: April 2020 Gravina Freight Dock Facility Geotechnical Data Report TABLE OF CONTENTS Table of Figures .................................................................................................................................................................. ii List of Tables ....................................................................................................................................................................... ii Appendices .......................................................................................................................................................................... iii 1. INTRODUCTION ................................................................................................................................................... 1 2. PROJECT BACKGROUND AND DESCRIPTION ....................................................................................... 1 2.1 Description ........................................................................................................................................................ 1 2.2 Site Geography .................................................................................................................................................. 2 2.3 Existing Site Conditions .................................................................................................................................. 3 2.4 Regional Seismicity and Seismic Hazards ..................................................................................................... 3 2.5 Regional Geology ............................................................................................................................................. 4 2.6 Regional Climate ............................................................................................................................................... 5 2.7 Local Tide Fluctuations ................................................................................................................................... 6 3. FIELD INVESTIGATION .................................................................................................................................... 6 3.1 Exploration ........................................................................................................................................................ 6 3.2 Equipment and Methods ................................................................................................................................. 6 4. LABORATORY TESTING ................................................................................................................................... 8 5. INVESTIGATION RESULTS .............................................................................................................................. 8 5.1 Soil Lithology and Composition .................................................................................................................... 9 5.2 Bedrock .............................................................................................................................................................. 9 5.3 Blow Count and RQD vs. Depth and Elevation....................................................................................... 11 6. LIMITATIONS and CLOSURE .......................................................................................................................... 13 7. REFERENCES ....................................................................................................................................................... 14 i April 2020 Gravina Freight Dock Facility Geotechnical Data Report Table of Figures Figure 2-1: Project Vicinity Map (Imagery from Google Earth) ................................................................................. 2 Figure 2-2: Earthen ramp at location of proposed freight dock facility, viewed from airport access road looking southeast ........................................................................................................................................................ 2 Figure 2-3: Earthen ramp at location of proposed freight dock facility, viewed from airport access road looking northeast ........................................................................................................................................................ 3 Figure 2-4: Map of Seismicity in Southeast Alaska ........................................................................................................ 4 Figure 3-1: Barge Husky with truck-mounted drill rig aboard ..................................................................................... 6 Figure 3-2: CME-75 truck-mounted drill rig used for offshore borings .................................................................... 7 Figure 3-3: Geoprobe 6712DT used for onshore boring ............................................................................................. 7 Figure 5-1: Typical sands and gravels (imported fill) observed at onshore borehole B-6 ....................................... 9 Figure 5-2: Surficial sand observed at offshore borehole B-4 ..................................................................................... 9 Figure 5-3: Matrix-supported silty sand and gravel observed immediately above bedrock at offshore borehole B-5 .................................................................................................................................................................... 9 Figure 5-4: Typical green and foliated metavolcanic bedrock observed within the offshore borings ................ 10 Figure 5-5: Crushed, unconsolidated argillaceous bedrock observed at offshore borehole B-5.......................... 10 Figure 5-6: Uncorrected Field Blow Count vs. Depth ................................................................................................ 11 Figure 5-7: Uncorrected Field Blow Count vs. Elevation .......................................................................................... 11 Figure 5-8: RQD vs. Depth ............................................................................................................................................. 12 Figure 5-9: RQD vs. Elevation ....................................................................................................................................... 12 List of Tables Table 2-1: Tidal Information for Ketchikan, Alaska ..................................................................................................... 6 Table 5-1: Borehole Summary .......................................................................................................................................... 8 Table 5-2: Rock Uniaxial Compressive Strength Test Results Summary ................................................................ 10 ii April 2020 Gravina Freight Dock Facility Geotechnical Data Report Appendices Appendix A. Vicinity Map, Exising Conditions with Borehole and Probe Hole Locations, and Subsurface Profile Drawings Appendix B. Borehole Logs Appendix C. Laboratory Test Results Appendix D. Soil and Rock Sample Photographs Appendix E. Climate Summaries Appendix F. GBA Publication – Important Information about your Geotechnical-Engineering Report iii Gravina Freight Dock Facility Geotechnical Data Report 1. INTRODUCTION This report presents the results of a marine geotechnical field investigation performed by PND Engineers, Inc. (PND) for the Alaska Department of Transportation and Public Facilities (ADOT&PF) in support of the proposed Gravina Freight Dock Facility project on Gravina Island in Ketchikan, Alaska. The report has been prepared by PND and provides geotechnical data gathered during the field investigation, and laboratory testing results performed on selected retained soil and rock samples. The objective of the geotechnical investigation was to delineate and characterize soil and bedrock across the project site. This information will be utilized in designing potential project elements such as abutments, foundation piles, and float anchor piles. Design recommendations based on the data presented in this report are provided in the document Gravina Freight Dock Facility Structural Foundations Engineering Report. PND performed the work in general accordance with the proposal Ketchikan Gravina Island Freight Dock Geotechnical Services Proposal, dated February 23, 2018. The work was authorized under Amendment No. 1 to Agreement No. 25183006 for Project No. SFHWY00154 on February 26, 2018. All data is presented in the report appendices. The report contains six appendices: Appendix A – Vicinity Map, Existing Conditions with Borehole and Probe Hole Locations, and Subsurface Profile Drawings presents a site map, as-built test hole locations, and a lithological profile section. Appendix B – Borehole and Probe Hole Logs presents the complete graphical test hole log set from the exploration. Appendix C – Laboratory Test Results presents the complete summary of results from the laboratory testing program. Appendix D – Soil and Rock Sample Photographs presents field photographs of individual soil samples and sequential rock core samples. Appendix E – Climate Summaries present climate data for the site pertaining to historical
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