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Revised 04/20/90 Section 780.18(b) Continued. relief and because little excavation, filling, or grading was required to construct the facility, the extent of final grading will be minimal. The area will be graded using bulldozers and motorgraders, and it will be smoothed to blend with the surrounding undisturbed area, consistent with the original topography as shown on Map 35, Kerr Tipple Area Premining Topography; Map 37, Kerr Tipple Area Postmining Topography; and Map 39, Kerr Tipple Area Premining and Postmining Cross Sections. Although the slopes at the Kerr Tipple Area are minimal, care will be taken to do all final grading and preparation of the site for • topsoil replacement along the contour in order to minimize any erosion or instability of the topsoil. Postmining Drainage During active mining and reclamation operations, site drainage for all effected areas will be effectively addressed by the drainage and sediment network previously described in Section 947.780.12 and detailed in Exhibit 42, Drainage and Sediment Control Plan. Following reclamation, most of the drainage and sediment control facilities will remain in place, continuing to provide runoff, erosion, and sediment control during the extended liability period. Upon receipt of a determination of revegetation success and confirmation that runoff water quality from reclaimed areas is comparable to either applicable effluent standards or baseline conditions, drainage and sediment control structures will be removed and the associated disturbance reclaimed. In addition to the short term drainage and sediment control measures described, Kerr has developed long term postmining drainage plans for all mine disturbance areas. The postiming drainage system includes 780-70 as