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2. EXECUTIVE SUMMARY <br /> TABLE 2-1 (Continued) <br /> SUMMARY OF IMPACTS AND MITIGATION MEASURES <br /> LEVEL OF <br /> ENVIRONMENTAL IMPACT MITIGATION MEASURES SIGNIFICANCE <br /> AFTER MITIGATION <br /> 4.6.2 Project Operational-Phase Emissions Impact. The 4.6.2 Project Operational-Phase Emissions Impact Significant and <br /> proposed surface mining of topsoil,sand and gravel <br /> Unavoidable <br /> would take place on approximately 659 acres within the <br /> Project Site. The proposed mining operation would <br /> consist of the extraction of 1.7 to 4.0 million tons per <br /> year of aggregate materials(sand and gravel)over a 26 <br /> to 60 year period. The operation would be open pit, <br /> sand and gravel harvesting and processing. The impacts <br /> of operational air quality emissions of criteria pollutants <br /> are potentially significant. <br /> 4.6.3 Project Odor Impact No mitigation is required Less-than-Significant <br /> 4.6.4 Project DPM Impact of On-site Equipment. 4.6.4 Limiting operation of the on-site equipment to between 6 am Less-than-Significant <br /> Implementation of the Proposed Project may lead to through 6 pm,without retrofitting non-road equipment engines, <br /> increases in chronic exposure of nearby sensitive would result in a carcinogenic risk of 33 per million. By <br /> receptors to certain toxic air contaminants from various limiting the hours of operation(of all diesel equipment)and <br /> stationary and mobile sources. This impact is installing DPM filters on the excavators,on-site haul trucks,and <br /> significant and unavoidable. front end loaders,the maximum incremental carcinogenic risk is <br /> estimated to be 10 in a million. <br /> 4.6.5 Project Carbon Monoxide Impact. Traffic generated by No mitigation is required. <br /> the project would have the potential to affect CO <br /> concentrations along surface streets and near stagnation <br /> points such as major highways and heavily traveled and <br /> congested roadways. This increase in traffic would not <br /> only add more vehicles on the road but the increased <br /> congestion would cause existing non-project traffic to <br /> travel at slower,less pollution-efficient speeds. This <br /> impact is potentially significant. <br /> RMC Peck Vernalis Quarry Mining and Reclamation Projecl 2-12 <br /> Administrative Draft EIR MarESA 207015 <br /> March <br /> ch 2004 <br />