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The slopes of the bluffs at the south and east edges of the project could become <br /> unstable by excavation near the base of these features. This could result in failure of <br /> the otherwise stable natural slopes. This could impact development or potential <br /> development on the bluffs. This would be considered a potentially significant impact. <br /> Reclamation of the processing facility and adjacent area would require <br /> recontouring of the land surface. Material from the proposed borrow area north of the <br /> processing facility would be used for recontouring the lower elevations. Steep slopes <br /> developed by the reclamation efforts could be unstable which could impact human <br /> safety. This would be considered a potentially significant impact. <br /> Soil Degradation <br /> The reclamation plan for the proposed quarry area calls for replacement of <br /> overburden upon completion of excavation. The proposed method of replacement of <br /> material could result in mixing of surface soils with subsoils, potentially resulting in a <br /> reduction in productivity of the soils. Reclamation of the area north of the Mokelumne <br /> River could subject soils from the borrow area to similar impacts. Because the U.S. Soil <br /> Conservation Service considers many of the soils in the project area to be Prime <br /> Farmland, loss of productivity would be a significant impact. <br /> 3.1.3 Mitigation Measures <br /> The mitigation measures listed below are intended to reduce the potentially <br /> significant and significant impacts that would result from project construction to less <br /> than significant levels. <br /> 1. To minimize water and wind erosion, temporary revegetation shall be conducted <br /> in areas where aggregate extraction is complete, with the exception of the area of <br /> active excavation (100 to 200 foot wide strip). A temporary revegetation plan <br /> shall be submitted to and approved by the County and the U.S. Soil Conservation <br /> Service prior to project construction. <br /> 2. To minimize erosion, maximum cut slopes for excavation, reclamation areas, and <br /> stockpiles shall be established by a soils engineer or certified engineering <br /> geologist. <br /> 3. To minimize the potential for impact to slope stability of the bluff areas, <br /> minimum setbacks for excavation shall be established by a soils engineer or <br /> 25 <br />