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~:l~ <br />Technical Revision No. 20 Page 2 <br />June 27, 1995 <br />going through the Southfield loadout will remain once the <br />site is reclaimed by EFCI. ATSFR should state that the <br />line serves more than the Southfield loadout; therefore, <br />the tracks will remain. <br />*While the general pre-mining landform morphology has <br />been reconstructed, it must also be designed to ensure <br />that adverse hydrologic impacts are minimized onsite, and <br />prevented offsite. The Division is concerned about the <br />erosion control that will exist once the sediment ponds <br />in the east and west loadout areas are reclaimed. Please <br />provide design information to ensure a stable drainage <br />bottom for the locations where flow will exit the east <br />and west side of the loadout. Please explain and show <br />how the area will be blended to limit erosive velocities. <br />*In review of cross-sections B-B', C-C', and D-D', it <br />appears that there may not be enough material cut from <br />areas to fill other areas during reclamation. The <br />reclamation plan and final topography proposal must <br />include a detailed material balance demonstration which <br />shows that there will be adequate material available to <br />ensure that the proposed topography can be constructed. <br />Please provide more information to justify EFCI's <br />calculation of 7,700 cy for the west loadout and 10,000 <br />cy for east loadout. <br />*In review of cross-sections C-C' and D-D', the pre- <br />mining surface is approximately 15 feet and 12 feet, <br />respectively, lower than the post-mining surface. The <br />Division considers the amount of variation between the <br />pre-mine and post-mine topography to be significant. <br />Please explain why the reclamation plan has been designed <br />as it is. <br />*The post-mining topography must be designed to ensure <br />both erosional and mass stability. The Division believes <br />that the final landform has been designed to provide <br />slope gradients and slope lengths which will not be <br />subject to accelerated surface erosion, (with the <br />exception of the area around the reclaimed sediment <br />ponds). EFCI should provide documentation that the <br />reconstructed landform was designed to a minimum safety <br />factor of 1.3. <br />Revised page 2.05.4-11, Map 29 and Map 32 are acceptable. <br />