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Executive Summary TABLE 2-1 (CONTINUED) SUMMARY OF IMPACTS AND MITIGATION MEASURES Environmental Impact Mitigation Measures Level of Significance (Level of Significance Prior to Mitigation) After Mitigation 4.8.6 Mining out Hospital Creek and constructing a berm to 4.8.6 The applicant shall implement the Mining Plan Option 1 as described Implementation of form a large detention basin(Mining Plan Option 2)would in Chapter 3.0, Project Description,and shown graphically in Figure Mitigation Measure substantially alter the natural hydrology of Hospital 3-3.Mining Plan Option 1 requires the applicant to leave Hospital 4.8.6 would eliminate Creek.This option would permanently remove surface Creek in place,mining both sides with a 100-foot setback from the the downstream water flows from the reach of Hospital Creek downstream cantering of the creek to the top of the mining slope. hydrologic issues of the proposed mining operations leading to depletion of associated with flows to downstream receiving water bodies, reduction of removing Hospital surface water available for localized infiltration,or Creek under Mining elimination of adequate water Flow for aquatic and Plan Option 2. riparian habitats.This would be a significant impact.(S) Implementing Mitigation Measure 4.8.6 would ensure that significant impacts related to Mining Plan Option 2 would not occur. However, if Mitigation Measure 4.8.6 is not implemented and Mining Plan Option 2 is identified as the preferred approach to mining adjacent to Hospital Creek,then the impacts to hydrology,as described above,would remain significant. 4.8.7 Mining operation would alter the natural,preferential flow No mitigation is required. pathways of surface water resulting in areas of localized onsite flooding.This is a less-than-significant impact.(LS) Cemex Vernalis Quarry Mining and Redama nPmled ES-15 ESA 1203019 Final Environmental Impad Report June 2009