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TR-019 Request <br /> Page 3 <br /> mine Pool Alkaline Injection <br /> This project involves the injection of alkaline waters into <br /> the mine pool to speed physical equilibrium and to allow the <br /> mine pool to approach chemical equilibrium from a basic pH. <br /> By initially raising the pH of the mine pool, the initial <br /> water quality of the mine pool prior to chemical equilibrium ��Lk <br /> will be improved and waters entering the fracture system to <br /> restore hydrologic equilibrium will be of improved quality. <br /> Implementation of this project will require the temporary <br /> installation of pumps, piping and possibly solution mix <br /> equipment within the permit area. <br /> There are two potential injection sites within the permit <br /> areas. These are the Terry Tunnel adit and the Sunnyside <br /> Basin ventilation adit entry. <br /> Each site is advantageous under differing circumstances <br /> although SGC would prefer to use the Terry Tunnel for the <br /> first stage of the process due to favorable site logistics. <br /> Access is easier for the quantity of material involved and <br /> spill containment structures that could be incorporated into <br /> the setup already exist at the Terry Tunnel. <br /> Setup would include a pump to draw water from Eureka Creek and <br /> piping to connect to the Terry Tunnel bulkhead piping. Check <br /> valves will be required to prevent back flow conditions at <br /> this site. A solution mix setup and solution injection pump <br /> will also be required. These will be set such that the Terry <br /> Tunnel settling ponds will serve for spill containment. The <br /> same features will be required at the Sunnyside Basin site <br /> although the system could be somewhat smaller due to limited <br /> water supplies and logistics of transporting the alkaline <br /> material to the site. The Lake Emma subsidence would be <br /> incorporated into the spill containment system. That way any <br /> spills would be contained and end up at the final destination <br /> (ie the mine pool) without extensive cleanup activities to <br /> protect the waters of the State in the event of material <br /> spillage. <br /> The type of alkaline material (ie lime, dry caustic or caustic <br /> solution) to be used to supply alkalinity to the mine pool has <br /> not been decided to-date. This should not matter as each <br /> resuirea--the_same basic _setup. <br /> This project will�be active through the first field season <br /> after bulkhead valve closure and depending on evaluation, the �7 <br /> second field season after valve closure also. Evaluation will v,J"-t0er�'— <br /> The dependent on ,physical equilibrium status and iudgement__of '1Ma+tif Ea <br /> rs, <br /> ffectiveness of_the-_injection� program. The surface physical will �e removed at the end of each field season. Ay <br />