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TR 14 Submittal <br /> Page Four <br /> Design - Cont <br /> 4) Ignoring bond strength between the rock and the concrete. <br /> 5) Assuming worst case orientation for earthquake loading <br /> for all bulkheads . <br /> 6) Providing additional shear studs on the by-pass pipe. <br /> 7) Ignoring shear resistance provided by the flanges and <br /> couplings to resist the design thrust on the installed <br /> pipes. <br /> For additional conservatism Sunnyside Gold Corporation will also do <br /> the following items not addressed in the design report. <br /> 1) The Brenneman B-Level and Brenneman F-Level bulkheads are <br /> above the existing water table so tightness (ie water seeping <br /> fractures) could not be evaluated. In addition, neither site <br /> will be accessible after water impoundment is started for <br /> inspection and/or remedial work . To compensate, two identical <br /> bulkheads (built according to the submitted design) will be <br /> constructed 100-200 feet apart. This will provide additional <br /> assurance that leakage will not occur along these pathways. <br /> 2) A limestone barrier from floor to roof will be constructed on <br /> the water side of each bulkhead. While this is probably not <br /> needed, given the sulfate resistant mix and the neutral or <br /> mildly acidic nature of the mine water that will contact the <br /> bulkheads, it is added protection for the bulkhead. <br /> Monitoring <br /> The conceptual plan does not address monitoring but pressure <br /> monitoring pipes will be installed through the accessible bulkheads <br /> (Terry Tunnel and American Tunnel) to track head gain behind the <br /> bulkheads. Seepage conditions will also be monitored at these <br /> sites. The Terry Tunnel pressure and seepage conditions can only <br /> be monitored during summer because of access but by monitoring the <br /> American Tunnel pressure, head conditions at the Terry Tunnel will <br /> be known. It is conceivable that within six (6) months of pipe <br /> closure, field confirmed evaluations/predictions could be made <br /> concerning the success of the plugs and subsequent permanent <br /> closure (ie. pipe grouting, surface reclamation) time schedules <br /> could be set and/or implemented . <br />