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Mitigation Work Plans <br />Additional Information <br />Page 3 <br />7. Pride of the West Tailings <br />SGC will have full owner approval prior to starting this <br />project. This will include any TR approval that the owners <br />may need prior to implementing this project. SGC will advise <br />DMG on project status so that the appropriate inspections can <br />be scheduled. <br />8. Columbus <br />SGC will determine the feasibility of installing bulkheads and <br />if determined feasible, design the bulkheads. These designs <br />will be submitted to DMG prior to installation. DMG will be <br />kept informed as to the progress on this project so that <br />inspections can be scheduled at the appropriate times. <br />9. London <br />SGC will determine the feasibility of installing bulkheads and <br />if determined feasible, design the bulkheads. These designs <br />will be submitted to DMG prior to installation. DMG will be <br />kept informed as to the progress on this project so that <br />inspections can be scheduled at the appropriate times. <br />The appropriate dosage rate, to stabilize the tailings or mine <br />waste to a near neutral pH, will be determined for each project <br />where it is proposed by; <br />1) taking a composite sample representative of the material <br />to be pH stabilized. <br />2) taking a paste pH of the material to determine if <br />alkaline material addition is required. <br />3) adding measured amounts of alkaline material to a <br />known weight of material, mixing and then taking a paste <br />pH of the material. This step will be repeated until the <br />paste pH of the mixture is near neutral. <br />4) extrapolating the quantity of alkaline material required <br />to raise the pH of the material to near neutral in the <br />bench test to equipment size lots which will be used in <br />the removal process. <br />5) this dosage rate may be checked and changed during the <br />project. <br />