2007-12-19_REVISION - M1980085 - Laserfiche WebLink

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4. Post Reclamation Site Drainage Almost the entire permit area will drain into the large opening which is created by mining and will likely run towards the northeast corner of the pit. The only areas which will not drain towards the opening created will be on lands which were not disturbed by mining or small portions of the reclaimed topsoil stockpiles. In order to prevent the formation of erosion features on the reclaimed slope a pair of drainage control ditches will be installed into the slope face once the slopes are reclaimed. Each ditch will be two feet deep with 2H:1 V side slopes and at a 2% grade downhill to the access road. The ditches have been designed to handle a 100-year, 24-hour event with a velocity of less then 3 fps. 5. Weed Control Elam Construction, Inc. will use BMP's to control weeds. Problem weeds will be monitored closely each spring for as long as the permit is active to determine if they are invading the area. Weed control will be initiated if the problem becomes serious. The Division of Minerals and Geology 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 feas- ibility 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. Technical Revision #2, which was approved in June of 2005, outlined a special plan to control tamarisk and Russian olive trees. This plan is enclosed on the following pages. Vagneur Pit June 07 E-5