Laserfiche WebLink
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 sit* 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 />