ii 1. Introduction ............................................................................................................1 1.1 Background .....................................................................................................1 1.2 Project Description..........................................................................................1 1.3 Scope of Report...............................................................................................1 2. Environmental Setting ............................................................................................3 2.1 Site Location....................................................................................................3 2.2 Physiography...................................................................................................3 2.3 Hydrology ........................................................................................................4 2.4 Regional Geology ............................................................................................5 2.5 Site Geology ....................................................................................................6 2.6 Catchment Scale Hydrogeology ......................................................................9 3. Site Investigations & Results.................................................................................12 3.1 Methodology.................................................................................................12 3.2 Geologic Characterisation.............................................................................12 3.3 Defect Analysis..............................................................................................16 3.4 Piezometer Installation.................................................................................18 3.5 Permeability Testing .....................................................................................20 3.6 Surface Water Gauging .................................................................................21 3.7 Surface Water Dating....................................................................................22 3.8 Surface Water Chemistry ..............................................................................25 3.9 Results Discussion .........................................................................................26 3.10 Conceptual Groundwater Model ..................................................................27 4. Assessment of Effects ...........................................................................................31 4.1 Groundwater Inflows ....................................................................................31 4.2 Drawdown Effects.........................................................................................31 4.3 Effects on Groundwater Quality ...................................................................34 4.4 Effects on other Aquifers ..............................................................................35 4.5 Effects on Surface Waters.............................................................................35 4.6 Effects on other Groundwater Users ............................................................39 4.7 Ground Settlement Effects ...........................................................................39 4.8 Effects on Plant Growth ................................................................................39 5. Conclusions and Recommendations.....................................................................41 5.1 Conclusions ...................................................................................................41 5.2 Recommendations for Monitoring ...............................................................42 6. References ............................................................................................................43 7. Limitations.............................................................................................................44 Tables Table 1 Standpipe Piezometer Details ....................................................................18 Table 2 Vibrating Wire Piezometer WKP-P03D Details...........................................18 Table 3 Surface Water Flow Gauging’s....................................................................22 Table 4 WKP Radon Concentrations and Flows in Surface Waters.........................24 Table 5 Groundwater and Surface Water Major Chemistry ...................................26 Table 6 Adopted Aquifer Hydraulic Parameters .....................................................27
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