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3-2 • The following sections identify proposed methodology for restoring areas disturbed by the operation to a condition equal to, or greater than, the highest previous use in accordance with the rules and regulations of the Colorado Mined Land Reclamation Board and the Office of Surface Mining. Topics presented include: Pre-Mining Topography -Steep Slope Post-Mining Topography Topsoil Placement and Seedbed Preparation ~ Mulching and Seeding Procedures Revegetation and Evaluation of Revegetation o Hydrologic Restoration Reclamation Schedule and Costs o Abandonment Reclamation techniques presented in the following sections have been developed from the state of the art technology and are applicable to site conditions. As the reclamation program progresses, CMLR approved modifications in the plan will be made to keep methods current. The lower portion of the affected area will be returned to approximate original contours (AOC), but the mine bench area will not. The mine bench area was disturbed prior to the enactment of the Surface Mining taw under the authority of an approved USGS exploration plan. Grand Valley has no record of the pre-mining topography. In response to Stipulation #11 of the July 5, 1985 permit approval, Salt Creek contracted with Air Photo Surveys and Global Engineering, Inc. to prepare a map of pre mining topography. The basis of mapping was a pair of stereo aerial photographs taken for the USGS on July 2, 1967. The photos were taken prior to any mining activity and are at a scale of 1:10,000. Because of the small scale of the photos, expansion to a scale of 1 inch equals 400 feet was the largest possible and the resultant map is rough. To refine the interpretation of the slopes on the map, the contractor used a parallax bar and the original photos to determine the original slopes in the mine bench area. • M~ Valume 1 4.29-96