SU0004094 - Laserfiche WebLink

Home Browse Search

Cemex Vernalis Quany Mining and Reclamation Pmject 4.6.2 Impacts and Mitigation Measures Mitigation Measures Measure 4.6.1: The project applicant shall comply with SJVAPCD's Regulation VIII control measures and shall retain-have an on-site air quality monitor to ensure compliance with the SJVAPCD's Regulation VIII control measures. The monitor must be familiar with the SJVAPCD Regulation VIII Fugitive PMio Prohibitions,including implementation of all feasible control measures specified in the SJVAPCD's Guide for Assessing Air Quality Impacts. Impact Significance After Mitigation: With implementation of the above mitigation measures in compliance with Regulation VIII,the project construction impacts would be _ less than significant. Impact 4.6.2: Project Operational-Phase Emissions Impact. The proposed surface mining of topsoil,sand and gravel would take place on approximately 659 acres within the Project Site,consisting of the extraction and processing of 1.7 to 4.0 million tons per year of aggregate materials over a 26 to 60 year period. The impacts of operational air quality emissions of criteria pollutants are potentially significant. Emissions from operations would include the processing facility, Ready Mix Concrete Plant, Asphalt Plant and a concrete recycling plant. The processing facility would consist of conveyors, screens, crushers, scrubbers,and stockpiles. There would be a Ready Mix Concrete Plant and an Asphalt Plant. A portable,concrete recycling plant,owned and operated by an outside contractor, — would intermittently be placed in the middle of the plant site to produce base material. The Ready Mix Concrete Plant,with an estimated production of 350,000 cubic yards per year,would include a cement silo, aggregate bins, conveyors,baghouse, bermed admixture tank farm, reclaimer and — concrete lined washout basins. The asphalt plant, with an estimated production of 400,000 tons per year,would be owned and operated by others. It would include a batch tower, aggregate bins, baghouse,and hot oil tanks. Approximately 75 percent of the processing plant would involve a wet screening process. The wet plant would consist of scrubbers, crushers,coarse material washers,fine material washers, conveyors, and wet screens for washing and sizing of materials. The other approximately 25 percent of the material would be processed through a dry circuit. This circuit would consist of conveyors, crushers, and dry screens for the sizing of the crushed aggregates. Excavators would be used for the harvesting of the sand and gravel lenses. Haul trucks would be loaded with sand and gravel material for a short haul from the excavator to a field conveyor line. Loaders would be used within the plant area for truck loading of some of the sand and gravel products. The graders and compactors would be used for haul road maintenance and the building — of reclamation structures (i.e., land engineered structures to provide reclamation). Cemex Vernalis Quarry Mining and Reclamation Project 4-44 ESA/203015 .-. Final Emronmental Impact Repoli June 2008