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Mr. Howard E. Tingley -2- May 15, 1984 2. Accordingly, Exhibit D also requires the submittal of information pertaining to nature, depth and thickness of the materials being mined. The applicant should provide the thickness, strike and dip, outcrop location of the gypsum and the volume of overburden to be removed. IV. Exhibit E - Reclamation Plan 1. As was discussed during the April 5, 1984 inspection, stability and revegetation potential are the primary concerns at this site. Proper stability can be achieved through proper and consistent grading of the final slopes. The 2 horizontal to 1 vertical slopes should be stable provided they do not become saturated by either pre-existing ground water or improper surface drainage. The permanent impoundment basins proposed in the reclamation plan are therefore inappropriate. All attempts should be made to avoid any possibilities of creating swales which may cause puddling, infiltration and ultimately saturation. Please revise the permit to exclude any permanent impoundments. Furthermore, the operator should notify the Division should any pit inflows occur. 2. Based on observations made during the April 5, 1984 inspection, topsoil does occur on site. Please revise the mine plan to include topsoil segregation, topsoil stockpile locations, stockpile stabilization and topsoil replacement depth. (See Exhibit I -Soils information section of this document.) 3. The Bureau of Land Management has suggested the following seed mix: 2 lbs pls. 3 lbs pls. 6 1bs pls. 1 lb pls. 1 lb pls. 13 lbs pure Crested wheatgrass Indian ricegrass Western wheatgrass Yellow sweet clover Four-wing salt bush live seed per acre. The Division suggests that this seed mixture rate be doubled if hand broadcasting methods are used. Please revise the revegetation plan accordingly. 4. The operator should commit to analyzing the plant growth medium at the time of reclamation and to providing amendments should the soil analysis deem them warranted. 5. The Division recommends a straw or native hay mulch of 2 tons/acre be applied at the time of reclamation, especially in steep slope conditions. The mulch should be crimped into the soil using a dozer to anchor the mulch. V. Exhibit F -Reclamation Plan Map 1. The reclamation plan map should be revised to accurately portray the proposed post-mining slopes. The contour lines on the map provided would be very difficult to achieve, especially the sharp edges between the undisturbed and disturbed areas. 2. Furthermore, since this is a permit for only a 12 acre parcel. Show the proposed post-mining topography for this area only.