Geotechnical Data Report Part A

APPENDIX B GEOTECHNICAL REPORTS B.1: Geotechnical Data Report Part A: Report Annacis Island WWTP New Outfall System Vancouver Fraser Port Authority Project and Environmental Review Application This page intentionally left blank 25 January 2018 GEOTECHNICAL DATA REPORT AIWWTP Transient Mitigation and Outfall System Submitted to: CDM Smith Canada ULC 4720 Kingsway, Suite 1001 Burnaby, BC V5H 4N2 Report Number: 1525010-108-R-Rev0 Distribution: REPORT 1 Electronic Copy - CDM Smith Canada ULC 1 Electronic Copy - Golder Associates Ltd. TRANSIENT MITIGATION AND OUTFALL SYSTEM Record of Issue Company Client Contact Version Date Issued Method of Delivery CDM Smith Canada ULC Mr. John Newby Rev A 26 September 2017 SFT Upload CDM Smith Canada ULC Mr. John Newby Rev 0 25 January 2017 SFT Upload 25 January 2018 Report No. 1525010-108-R-Rev0 TRANSIENT MITIGATION AND OUTFALL SYSTEM Table of Contents 1.0 INTRODUCTION .................................................................................................................................................... 1 2.0 SITE CONDITIONS AND PROPOSED DEVELOPMENT...................................................................................... 2 3.0 SITE GEOLOGY .................................................................................................................................................... 3 4.0 SUBSURFACE INVESTIGATIONS ....................................................................................................................... 4 4.1 Mud-Rotary Drilling and Sampling ............................................................................................................ 4 4.1.1 Split-Spoon Sampling.......................................................................................................................... 5 4.1.2 Relatively Undisturbed Soil Sampling (Thin-walled Tube Samples) .................................................... 5 4.2 Sonic Drilling ............................................................................................................................................. 6 4.3 Cone Penetration Testing ......................................................................................................................... 6 4.4 In Situ Testing ........................................................................................................................................... 7 4.4.1 Nilcon Vane Test ................................................................................................................................. 7 4.4.2 Electric Vane Test ............................................................................................................................... 7 4.4.3 CPT Pore Water Pressure Dissipation Test ........................................................................................ 7 4.4.4 Shear Wave Velocity Measurements .................................................................................................. 8 4.5 Permits and Private Property Access Agreements ................................................................................... 9 4.6 Utility Clearance........................................................................................................................................ 9 4.7 Test Hole Location Surveying ................................................................................................................. 10 4.8 Test Hole Completion ............................................................................................................................. 10 5.0 GEOTECHNICAL INVESTIGATION PROGRAMS .............................................................................................. 11 5.1 Phase I Geotechnical Investigation......................................................................................................... 11 5.2 Phase II Geotechnical Investigation........................................................................................................ 11 5.2.1 Phase II Offshore Investigation ......................................................................................................... 13 5.2.2 Phase II Onshore Investigation ......................................................................................................... 13 5.3 Phase III Geotechnical Investigation ....................................................................................................... 14 5.4 Phase IV Geotechnical Investigation ...................................................................................................... 15 5.4.1 Phase IV Offshore Geotechnical Investigation .................................................................................. 16 5.4.2 Onshore Geotechnical Investigation ................................................................................................. 16 5.5 Results of Field Vane Tests .................................................................................................................... 17 25 January 2018 Report No. 1525010-108-R-Rev0 i TRANSIENT MITIGATION AND OUTFALL SYSTEM 6.0 HYDROGEOLOGICAL INVESTIGATION ........................................................................................................... 19 6.1.1 Dissolved Gas Sampling ................................................................................................................... 19 7.0 LABORATORY TESTING ................................................................................................................................... 20 8.0 CLOSURE ............................................................................................................................................................ 21 TABLES Table 5-1: Phase I Field Investigation Program Summary ............................................................................................ 11 Table 5-2: Phase II Field Investigation Program Summary ........................................................................................... 12 Table 5-3: Phase III Field Investigation Program Summary .......................................................................................... 14 Table 5-4: Phase IV Field Investigation Program Summary .......................................................................................... 15 Table 5-5: Nilcon Vane Test Results Summary ............................................................................................................. 17 Table 6-1: Phase III and IV Hydrogeological Program Summary .................................................................................. 19 Table 7-1: Laboratory Testing Standards Summary ...................................................................................................... 20 FIGURES Figure 2-1: Project Location Plan Figure 2-2: Conceptual and Final Outfall Alignments Figure 3-1: Surficial Geology Map Figure 4-1: Test Hole Location Plan APPENDICES APPENDIX A Records of Boreholes and CPT Logs APPENDIX B Technical Memoranda on SPT Energy Measurements APPENDIX C Photographs of Sonic Cores APPENDIX D CPT Pore Pressure Dissipation Tests APPENDIX E Nilcon and Electric Vane Raw Traces APPENDIX F Hydrogeological Testing Results APPENDIX G Laboratory Testing Reports APPENDIX H Mineralogy and Soil Abrasivity Analyses 25 January 2018 Report No. 1525010-108-R-Rev0 ii TRANSIENT MITIGATION AND OUTFALL SYSTEM 1.0 INTRODUCTION Golder Associates Ltd. (Golder) was retained by CDM Smith Canada ULC (CDM Smith) to provide geotechnical, environmental, and archaeological services for the Annacis Island Wastewater Treatment Plant (AIWWTP) transient mitigation and outfall system from pre-design (Phase A), to detailed design (Phase B) and through to construction (Phase C). The predesign work generally involved discussions on route and options selection, type of outfall system (i.e. grade-supported, piled, and tunnelled). Golder has carried out geotechnical field investigations in two phases, including on-land and offshore boreholes and cone penetration tests along the proposed conceptual outfall alignments, referred to as the western and central alignments, as part of the conceptual study; this was implemented initially under a separate contract to Black & Veatch Canada, and subsequently under the predesign contract with CDM Smith. The field investigations during the predesign phase were focused on obtaining limited subsurface information along the conceptual alignments to assist with the route and option selection. A western alignment, located 500 m west of the existing outfall, was initially selected as the preferred alignment following completion of the Phase II geotechnical investigation, and subsequently additional subsurface exploration (Phase III) was completed focusing on this preferred alignment to address data gaps, including hydrogeological testing. In addition, the Phase III investigation included a limited subsurface exploration at the potential future shaft location associated with the conveyance system from the Stage V expansion of the treatment plant to the proposed outfall. The preferred alignment was subsequently shifted further east to a location some 200 m west of the existing outfall to allow the riser pipe and diffuser system to be located at a location within the river channel where the potential impacts due to sedimentation are minimized. This new preferred alignment is referred to as the “Option 6 Outfall Alignment”, and is the alignment finally selected for detailed design. Additional

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