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• 4.3.6 EROSION CONTROL PLAN <br />This subsection describes the Erosion Control Plan to be utilized at <br />the Edna Mine. Erosion control involves three distinct types of activity, <br />including Proactive Erosion Control, Erosion Inventory and Monitoring, and <br />Reactive Erosion Control. These activities are described under separate <br />subheadings below. The first subheading describes proactive erosion <br />control measures and practices that are used routinely in planning, and <br />during day-to-day mining and reclamation operations. The second subheading <br />describes inventory and monitoring procedures to be used to identify <br />instances where erosion has, or may become, excessive or threaten the <br />postmining land use. The third subheading details measures to be <br />implemented when monitoring determines that erosion levels at a given <br />location are unacceptable. <br />The plan covers the following types of reconstructed soils in the <br />West Ridge and Moffat areas: <br />1) Salvaged Soils: Where previously salvaged soil materials (i.e., <br />the A soil horizon or the top six inches of suitable undisturbed <br />soil material) have been replaced; and <br />• 2) Substitute Soil Reconstruction Materials: On non-topdressed areas <br />where the West Ridge Hydrologic Reconstruction Plan ("WRHR Plan") <br />was approved and implemented, and revegetation operations have <br />been conducted. <br />4.3.6.1 Proactive Erosion Control <br />The overall goal of the surface hydrologic control plan implemented <br />during the mining process was to minimize and mitigate on-site and off-site <br />impacts during the disturbance phase, to the extent that this was <br />physically possible and economically prudent. Hydrologic control and <br />rehabilitation efforts provided concentrated flow structures which were <br />stable and capable of conveying runoff through undisturbed, disturbed and <br />reclaimed lands within the permit area, while realizing minimal attendant <br />erosion. <br />The overall goal of the reclamation process is to establish a stable <br />land form that is capable of supporting the postmining land use. In order <br />to achieve a stable, productive, postmining landscape, the planning process <br />• strives to integrate topographic, hydrologic and revegetation <br />Renewal-3 4.3-17 June 13, 1997 <br />