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Permit Revision No. 7 -Responses March 7, 1997 Page 12 66. Please see the response to question 58 in regards to the disturbed acreage. Topsoil volume is estimated to be approximately 91,700 CY. The amount of soil salvaged, as shown on Table 36A and in Table 1 of Exhibit 69, was estimated using a stripping depth of 24 inches at the shafts site and a 12 inch depth elsewhere. Due to the variability of the topsoil depths, it is difficult to estimate how much topsoil will be salvaged. However, MCC will commit to salvaging all available topsoil. (See also response to question 53.) Pages 2.05-56 and 2.05- 62 have been revised to state that an average 12 to 18 inches of topsoil will be replaced in the SGFA. This depth is consistent with the depth requirement in the current facilities area. In addition, Table 36A has been revised to reflect proposed topsoil quantities. Topsoil Pile #2 was eliminated and replaced with a Live Subsoil Pile. 67. All facilities related to the SGFA aze included on Map 53B and the final design drawings, which have both been revised and are enclosed. 68. The reclamation plan section of Exhibit 69 has been revised to state that all geogrid type engineered embankments will remain in place, except for the main access road crossing of Sylvester Gulch and the block faced retaining wall at the shaft site. 69. The final location (currently four potential hole locations within the pad have been sited) and construction details of the electric borehole have' not yet been determined. At this time, MCC would only like to permit and construct the pad site. Once the designs of the borehole have been determined, a revision will be submitted to the Division. 70. New Maps 58A and 59A, which detail the reclaimed contours and cross-sections of the SGFA have been included in this submittal. Cross-sections include typical as well as site specific reclamation for each of the disturbed areas. Backfilling, soil stabilizing, compacting and grading within the SGFA following cessation of operations will be done according to standard construction practices. 71. Please find enclosed a Technical Memorandum from Golder Associates to Eric Mende, which clarifies the slope stability analysis performed on the Sylvester Gulch Facilities Area (post-construction and post-reclamation). The slope stability analysis included in the application package remains valid. This memo and other supporting information have been sent to Dr. Jim Pendleton, under separate cover, to adequately address his concerns. 72. The Sylvester Gulch road has been approved in the current permit as a permanent facility. The road is currently an access road which is maintained to provide access to the Sylvester Gulch fan. Other than reclamation of a minor cut and fill in the area of the fan, the road will remain (see Exhibit 42). With the proposed facilities to be located in Sylvester Gulch, the road will be upgraded to a haullaccess road and the alignment will change. Upon final reclamation the road will be reclaimed to a light-use road, and will follow the new alignment and not the alignment that exists currently.