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I I I I I I f I ( + I I I I 1 1 5.4 Alternatives Considered But Rejected as Infeasible TABLE 5.1 (CONTINUED) COMPARISON MATRIX OF THE PROJECT ALTERNATIVES Alternative 2 Alternative 2 Alternative 1 (Reduced Project (Reduced Project Alternative 3 (No Project Production) Production) (Off-Site Proposed Alternative) Scenario 1 Scenario 2 Alternative) Project Operation air quality impacts LS S S S S Odor impacts LS PS PS PS+ PS Carbon monoxide impacts LS LS LS LS LS Expose sensitive receptors to DPM due to onsite operations LS PS PS- PS+ PS Cumulative air quality impacts LS LS LS LS LS Expose sensitive receptors to DPM due to off-site haul trucks LS LS LS LS LS TAC exposure from the asphalt plant LS LS LS LS LS Geology and Soils Slope instability LS LS LS LS LS Soil erosion due to wind,rain,runoff LS LS LS LS LS Soil erosion due to reclaimed slope LS LS LS PS LS Seismic hazards LS PS PS- PS- PS Hydrology and Water Quality Groundwater loss due to evaporation PS PS PS PS PS Degradation of groundwater quality PS PS PS PS PS Potential for contamination to enter existing groundwater wells LS PS PS PS+ PS Depletion of groundwater supplies PS LS LS LS LS Decrease infiltration of surface water and reduce groundwater recharge LS LS LS LS LS Alter the natural hydrology of a creek—Mining Option 1 LS LS LS LS LS Alter the natural hydrology of a creek—Mining Option 2 LS S LS S S Flooding impacts LS LS LS LS LS Biological Resources Impacts to"Waters of the U.S.,"including wetlands PS PS PS- PS PS Key: LS=Less-than-Significant(No Mitigation Required) +=Greater in magnitude PS=Potentially Significant(Mitigation Identified to Reduce Impacts) -=Lesser in magnitude S=Significant(No Mitigation Available) RMC Pacific Vernalis Quarry Mining and Reclamation Project 5-23 ESA/203015 Draft Environmental Impact Report May 2006