2004-08-19_REVISION - M2003037 (3)

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4. Post-Reclamation Site Drainaee Maps C-2 and F show arrows indicating the approximate direction of drainage throughout the pit. Almost the entire permit azea will drain to the northeast towazds the old Metcalf Pit. This is similar to the original path that water on the surface follows. A very small portion of the water will drain towards the southeast corner where the natural berm was removed and the pit is daylighted to Mexican Gulch and another small portion to the north towazds the north end of the George property, where it will settle into the ground. 5. Weed Control Haldorson and Sons, Inc. will take measures to ensure that the reclaimed land is free of weed infestations. Problem weeds will be monitored closely each spring for the first two years after reclamation to determine if they are invading the area. Weed control will be initiated if the problem becomes serious. The Division and the NRCS will be consulted regarding any weed infestation area and any control measures prior to their initiation. It may be necessary to control weeds by mowing after the first year; the feasibility of chemical weed control methods will be studied should it be necessary. The plan does not contemplate total weed removal on the property. Past experience shows that some initial weed cover in the first year following retopsoiling is beneficial to the reclamation effort in non-irrigated areas such as the slopes. Weeds tend to provide shade for new grasses, are a means of holding snow on the seedbed longer and protect it from wind and water erosion until the planted species have taken hold. 6. Reve¢etation Success Criteria It is suggested that the dry range revegetation in should be deemed successful when the live perennial cover is adequate to control erosion and no less than 90% of the pre-mine vegetation in similar surrounding areas. Haldorson Sand and Gravel Mine 24