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Page 2 Mr. Don Kriz December 18, 1979 6. Topsoil stockpiles should be clearly labeled. 7. Perhaps a clearer i7.lustration of the mining plan, showing phases or same selected contours during mining. Exhibit D: 1. To what adjacent pit area will the water from active pit dewatering be pumped? This pit area should be considered ea part of the affected lands. 2. The overall plan should tie in closely with the illustrations of Exhibit C. 3. Is there a tested depth to shale? Is it usually more or less than 25 feet? 4. What provisions are to be made for the protection of the gas line running along the western edge of the Chambers Pit area? 5. Topsoil stockpiles should be planted with a perennial grass cover such as Western wheatgrass for adequate stabilization. Exhibit E: 1. The seed mixture planned for both the Chambers and Rifle Pit areas should be more diverse and should include a nitrogen fixer. The staff recommends the following mixture: Western wheatgrass TaI1 wheatgrass Russian wildrye Alkali eacaton Yellow sweetclover - 3 ~~bs. P.L.S./acre - 3 lbs. P.L.S./acre - 2 lbs. P.L.S./acre - .1 lta• P.L.S./acre - .5 lb. P.L.S./acre The seeding rates should be doubled if broadcast. 2. With a precipitation rate as low as 11.2 inches per year, all seeded areas should also be mulched such that soil moisture aey be better retained. 3. The planned 3:1 slope to the water level in the pit should be maintained to 10 feet below the expected water level. (Reference Rule 6.1 f..) This should Ue true for all shores in both the Rifle and Chambers Pit areas. Exhibit F: 1. A topographic map is again needed to show final contours of the reclaimed areas and expected water levels in the nits. The contour lines on this maP will help to indicate probablE drainage patterns