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Executive Summary TABLE ES-1 (CONTINUED) SUMMARY OF IMPACTS AND MITIGATION MEASURES Environmental Impact Mitigation Measures Level of Significance (Level of Significance Prior to Mitigation) After Mitigation c. The construction of 6-to 8-foot solid fences or sound walls may be feasible(especially for some residences along Haul Route 3) and may be able to substantially reduce noise from haul trucks at some ofthe residences along the haul route. In such cases,the mine should compensate homeowners forthe fences or sound walls. However,for the residences on Segment 5(residence R9) and Segment 8(residence R10),fences or sound walls would probably not be practical or feasible. In these locations the homes are set back a considerable distance from the road and in order to reduce traffic noise to a less-than-significant level,sound walls would need to be too massive to be practical. Residence R10 on Segment 8 is also subjected to considerable existing noise from traffic on 1-5,so any sound wall on Blewett Road would be ineffective in reducing noise from 1-5. Air Quality 4.6.1 Project Construction-Related Emissions Impact.Project 4.6.1 The project applicant shall comply with SJVAPCO's Regulation VIII Less than Significant construction emissions would result in intermittent, control measures,and shall retain an onsite air quality monitor to temporary increases in air pollutant emissions.This ensure compliance with the SJVAPCD's Regulation VIII control impact is considered potentially significant. measures.The monitor must be familiar with the SJVAPCD Regulation VIII Fugitive PM10 Prohibitions,including implementation 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 available, Significant proposed surface mining of topsoil,sand and gravel current proven technology limits the maximum reductions.These would take place on approximately 659 acres within the operational impacts are a significant impact of the project after Project Site.The proposed mining operation would mitigation.The project proposes to operate new equipment,both on- consist of the extraction of 1.7 to 4.0 million tons per year site non-road equipment and haul trucks.This provides the best of aggregate materials(sand and gravel)over a 26-to available operating efficiency for the equipment.Currently,additional 60-year period.The operation would be open pit,sand retrofits to reduce NOx emissions below acceptable emission and gravel harvesting and processing.The impacts of standards would be cost-prohibitive.Catalytic particulate filters and operational air quality emissions of criteria pollutants are the use of ultra low sulfur fuels do not substantially reduce NOx potentially significant. (PS) emissions. 4.6.3 Project Odor Impact.The impact of odors from the project No mitigation is required. would be less than significant. (LS) Cemex varnaAa Quarry Mining and RedamaEpn Project ES-10 ESA 1203015 Final Environmenbl Impact Report une 2008 I I 1 _ I. - L _ 1 . I I __ L _ i _ 1.--_ L _-- l _- I I