ii Contents 1. Introduction...............................................................................................................1 1.1 Background ........................................................................................................ 1 1.2 Project Description............................................................................................. 1 1.3 Scope of Report.................................................................................................. 3 2. Existing Environment .................................................................................................4 2.1 Regional Geology ............................................................................................... 4 2.2 Regional Hydrogeology ...................................................................................... 5 2.3 Regional Hydrology ............................................................................................ 5 3. Groundwater Effects Assessment – WUG Access Tunnel .........................................7 3.1 Tunnel Description............................................................................................. 7 3.2 Characterisation of Tunnel Alignment ............................................................... 7 3.3 Conceptual Groundwater Model ..................................................................... 11 3.4 Groundwater Effects Assessment.................................................................... 12 4. Groundwater Effects Assessment – Willows Farm Access Tunnel..........................15 4.1 Characterisation of Tunnel Alignment ............................................................. 15 4.2 Conceptual Groundwater Model ..................................................................... 21 4.3 Groundwater Effects Assessment.................................................................... 23 5. Groundwater Effects – WUG Dual Tunnels .............................................................27 5.1 Characterisation of Tunnel Alignment ............................................................. 27 5.2 Conceptual Groundwater Model ..................................................................... 30 5.3 Groundwater Effects Assessment.................................................................... 30 6. Recommendations...................................................................................................34 6.1 Discussion......................................................................................................... 34 6.2 Recommendations for Monitoring .................................................................. 34 7. References ...............................................................................................................36 8. Limitations ...............................................................................................................37
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