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j successful revegetation (Goldman and others, 1986). These slopes would general) �. Y require careful treatment to ensure the establishment of vegetative cover. The reclamation plan proposes that straw would be applied at a rate of 1,000 pounds per acre, using a standard cultivator equipped embankment.roller. The amendment of straw in this manner 'G is appropriate, although rate of application is less-than that proposed by some guidelines ;I (3,000 to 8,000 pounds per acre) (Goldman et al., 1986). In addition, the proposed project does not include control of runoff from surrounding lands. Runoff, even sheetflow, from areas draining toward the proposed mining areas could result in significant erosion of the j �., mining and reclamation area sideslopes, and damage to corresponding vegetative cover. This is a significant impact. Alternative 4: No Project r i! Under the No Project Alternative, the slight erosion hazard at the project site would be II unchanged. Mitigation Measure.4.2-3a (Alternatives 1, 2, and 3) I' i Runoff from off-site areas shall be controlled in a manner to prevent such flows from li entering the mining area. These controls could include drainage ditches and/or berms that would route water away from the tops of the proposed excavation and mining slopes. A drainage plan shall be prepared by a qualified and licensed r,, engineer which provides runoff control and submitted to the Development Services Division prior to the commencement of mining. Mitigation Measure 4.2-3b (Alternatives 1, 2, and 3) { i 3 Annual inspection by the County of the completed reclamation areas shall specifically �i evaluate the effectiveness of vegetative cover in preventing erosion. The inspections shall identify areas of reclaimed slopes on which significant soil surface is bare of vegetation or where rill or gully formations are occurring, and any areas of significant soil slides or other disruptions of the final slope surface. The proponent shall be I notified of any identified problems and required to remediate these areas prior to the next annual inspection, or immediately, if deemed necessary by the County ' inspection. If an erosion or revegetation problem is identified in the same area for two consecutive years, the proponent shall submit, for approval b Development pp Y P Services Division, a revised reclamation plan.which provides for reduced slope steepness or alternative measures for controlling identified problems. If reduction of slope steepness is required, the proponent shall identify the source of any necessary fill materials and amend the Financial Assurances for the project to address any a necessary financing to place the fill. i� i I Draft Environmental Impact Report 4-19 ER-96-3 it