2007-01-31_REVISION - m1986015 (9)

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C r . . . . . M . . IMI � — — — — — — — — — M, . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I To PRRM�91D¢th�er� Recipients fA E_ NOTES ON RECLAMATION OF PHASE 1 As each sediment basin is completed with filling using processing fines and overburden, as needed, it will be reclaimed. As a completed sediment basin will have no further use, not reclaiming it increases the amount of affected land and only increases the amount of work needed to complete the operation. However, it may be necessary to wait some time before reclaiming if the surface of the sediment basin is too soft to work. Once a sediment basin is dry enough to work, it should be capped with overburden and finally soil to a depth of between 0.5 and 3 feet above the groundwater elevation. The final grade should have a very gentle slope toward the southeast. The surface should have a variable topography with broad dips and valleys with no greater relief than about two feet from the highest to the lowest points. This adds habitat diversity to create a high diversity vegetation as well as a dynamic vegetation that is very easy to establish. Weed control, particularly for Tamarix, should begin as soon as plants are seen invading the area. Waiting only makes the problem and cost greater. After one summer of sitting or two summers if Tamarix weed control has been applied, if cottonwood and willow is not seen invading the area that has been reclaimed planting with cottonwood whips and willow stem transplants at about 100 cottonwoods /acre and 200 willow stems per acre should be done. This will initiate growth which will quickly expand into the desirable vegetation. When completed, the entire backfilled pit should be about 4 to 6 feet higher at the northwest corner than the southeast corner. This will allow heavy rainfall to flow toward the outlet in the southeast corner. When fully developed vegetation is present it is unlikely much water will ever be discharged out the outlet, but until then an outlet is needed to release excess water accumulation. The crest of the sediment basin berms should be buried under a couple of feet of material, but the berm itself can remain in place. Side slopes leading from the unmined adjacent land will be graded to a slope of 5:1 or less steep. These slopes should be less than 10 feet high. Either fill or cut and fill may be used to create the slopes. The plant site, when no longer needed, will bey ripped to a depth of 2 feet, covered with at least 10" of soil and planted with the mixture slated in Reclamation Plan. If the overburden in the plant site has been used for fill, then reclaim similar to the backfilled pits. The settling and discharge area east of the drainage will retain whatever lake is present. Leave the discharge flume in place. Plant with cottonwood whips at the rate of 100 trees per acre where cottonwood invasion does not ?occur within one summer of completion of use or two summers if weed control has been ,applied. High spots will be graded down to create a slightly variable topographic slope that dips toward the river. = M -- . - -. -- -- -- -- -- - PRE-MINING TOPOGRAPHY THIS MAP REPLACES PREVIOUS EXHIBIT C -4 Confidential? Ak-i Type Sell AM -03 I �edaadion TAo �,t� Revised: 01/07 Amendment 3 Revised: 06/04 Amendment 2 Revised: 09/02 add Aquila power line Buried Sediment Basin Barrier Berms PROPERTY BOUNDARY (Where not congruent with Permit Boundary) PERMIT BOUNDARY MINING LIMIT JAN 3 19r1 Divisio^ or Rc 100 400 t mining arcs ,- O 200 scale: t" = 300' contour interval = 2' Continental Materials (M- 1986 -015) East Pit - Transit Mix of Pueblo Exhibit F -1 A -PHASE 1 DETAIL Reclamation Topography Drawn by: MAH F1A- amend 3 RECLA Phase 1 Detail MapAn