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2.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 of all feasible control measures specified in the SJVAPCD's Guide for-Assessing Air Quality Impacts. 4.6.2 Project Operational-Phase Emissions Impact.The 4.6.2 While several emission-reducing measures are currently Significant proposed surface mining of topsoil,sand and gravel available,current proven technology limits the maximum would take place on approximately 659 acres within the reductions.These operational impacts are a significant Project Site.The proposed mining operation would impact of the project after mitigation.The project consist of the extraction of 1.7 to 4.0 million tons per year proposes to operate new equipment,both on-site non- of aggregate materials(sand and gravel)over a 26-to road equipment and haul trucks.This provides the best 60-year period.The operation would be open pit,sand available operating efficiency for the equipment. and gravel harvesting and processing.The impacts of Currently,additional retrofits to reduce NOx emissions operational air quality emissions of criteria pollutants are below acceptable emission standards would be cost- potentially significant.(PS) prohibitive.Catalytic particulate filters and the use of ultra low sulfur fuels do not substantially reduce NOx emissions. 4.6.3 Project Odor Impact.The impact of odors from the project No mitigation is required. would be less than significant.(LS) 4.6.4 Project DPM Impact.Implementation of the project may 4.6.4 The applicant shall either utilize new model year on-site Less than Significant. lead to increases in chronic exposure at nearby sensitive machinery equipped with the best available DPM control receptors to certain toxic air contaminants from operation technology,or retrofit its fleet of excavators,on-site haul of the combination of stationary and mobile sources.This trucks,and front end loaders with catalyzed DPM filters to impact is potentially significant.(PS) minimize DPM emissions,or,in those limited instances where the retrofit would impede the function or life of the equipment,or presents safety concerns,the applicant shall comply with alternative measures developed by the Air Board. 4.6.5 Project Carbon Monoxide Impact.Traffic generated by No mitigation is required. the project would have the potential to affect CO concentrations along surface streets and near stagnation points such as major highways and heavily traveled and congested roadways.This increase in traffic would not only add more vehicles on the road but the increased congestion would cause non-project traffic to travel at slower speeds,thus increasing CO emissions.This impact less than significant.(LS) RMC Paaic Vemalia Quant'Mining and Reclamation Project 2-12 ESA I Project No 203015 craft Environmental Impact Report May 2006 I I I I l l l_ _. L . _ L. .. l L I I I l L I I