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Memo to Bill Goodhard -3- February 13 , 1996 <br /> Howardsville Mill tailing pond currently permitted by the Mined Land <br /> Reclamation Board would require a modification, probably a technical <br /> revision, to that permit. An inspection of sedimentation controls <br /> during the tailing removal project may be appropriate. <br /> 8. The work plan detailing grading and vegetation establishment on the <br /> Columbus Mine Dumps provides the basic information necessary to <br /> allow DMG to inspect the site and make a determination as to whether <br /> or not the project has been completed and meets the requirements of <br /> the selected performance standards. In order to evaluate the <br /> adequacy of hydraulic bulkhead seals in the Columbus Mine Portals, <br /> if such seals are determined to be feasible, DMG would have to be <br /> provided with designs for the bulkheads prior to installation, and <br /> may also need to conduct one or more inspections of the bulkhead <br /> locations during preparation and installation. <br /> 9. The work plan detailing grading and vegetation establishment on the <br /> London Mine Dumps provides the basic information necessary to allow <br /> DMG to inspect the site and make a determination as to whether or <br /> not the project has been completed and meets the requirements of the <br /> selected performance standards. In order to evaluate the adequacy <br /> of hydraulic bulkhead seals in the Columbus Mine Portals, if such <br /> seals are determined to be feasible, DMG would have to be provided <br /> with designs for the bulkheads prior to installation, and may also <br /> need to conduct one or more inspections of the bulkhead locations <br /> during preparation and installation. <br /> The tailing and mine waste relocation, grading, or removal projects <br /> proposed in the work plans include measures to "add high pH material to <br /> stabilize pH to near neutral" . Please provide details on the method for <br /> determination of the appropriate dosing rate for high pH material to be <br /> added to the mine waste or tailing, and also provide details on how the <br /> high pH material will be mixed into and blended with the mine waste or <br /> tailing. <br /> DMG recognizes that our primary involvement in the implementation of the <br /> work plans will be to conduct inspections of projects sites after <br /> completion to determine if the requirements of selected performance <br /> standards have been accomplished. However, as you can discern from the <br /> foregoing comments, SGC will have to keep DMG apprised of the status of <br /> on-going mitigation projects in order to facilitate some inspections <br /> deemed necessary while the mitigation projects are underway. <br /> cc: Sarah Johnson, WQCD <br /> Steve Brown, AGO <br /> C:\WP51\SGC9.WPN <br />