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Based on review of the revised permit renewal application, it is • unclear as to what the nature and extent of disturbance at the "left open" pit area will be during the period of maximum disturbance. In order to verify the accuracy of the reclamation costs calculated for this area, the nature of the disturbance should be clearly described, including an estimate of box cut and other spoil quantities to be backfilled, and the cost for completing all necessary grading work. RESPDPlSE: Page 1~-53 is revised to clarify the location of this pit and Irow backfilling and yradiny of this pit is being performed. The previously submitted bonding calculations included this pit in Tab 13, Fage 13-52 and in Attachment 13-I, Page 13-84. These calculations have been further revised to reflect conversations with the Division on September 30, 1986. • C01.1h1EPlT: C. 4'olf Creek Fit The final grading plan for the box cut spoils at this area has been approved as a variance fr•oni the requirements to restore approximate original contour. A remaining concern, however, is the effect the prul!nsed regraded final pit configuration will have on the pot?ritial for slope erosion and loss of topsoil. Rased on a review of Exhibit 1~-1, it appears that the proposed grading plan will result in the creation of a linear swale or depression oriented directly down the face of the reclaimed hillslope. PCC must adequately address the potential for erosion along the final reyraded pit area and provide an adequate demonstration that rilling and gullying will not occur or that it can be effectively controlled. This demonstration should be based upon on-the-ground periorniance of previously mined and reclaimed areas at the Seneca II I•line. PCC must also demonstrate that loss of topsoil will not • occur as a result of the proposed regraded configuration. F 31