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4.Environmental Analysis 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 he 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). The types of equipment to be used in the mining and hauling of the material include the _ following: • Excavators a Bobcat loader • Haul trucks • Maintenance truck — • Front end loaders • Lube and fuel truck • Grader and compactors • Forklift • Dozer • Pickup trucks — • Scrapers • Water truck Scrapers would be used to strip and remove topsoil,overburden, and clays.Topsoil would be — stripped and removed by using scrapers, and stockpiled in the berms for use in landscape areas and future reclamation. The highest volume of stockpiled topsoil would reach approximately 50,000 cubic yards. The stockpiles would be watered and track rolled to prevent erosion and — would be seeded for further protection if necessary. The on-site equipment and material haul roads would be unpaved. Although there are operational emissions of PMIo, the Valley Air District guidance does not provide for a significance threshold for PM1o. However,the project must comply with Regulation VIII with regards to visible emissions and opacity requirements as well as any Authority-to- Construct permits. Of the 355 tons per year of PM1g emissions from on-site processing equipment,63 percent is from the crushers, screening, conveyors, and other operations within the sand and gravel process, 16 percent is from unpaved roads, with the remainder from the concrete, — asphalt, and sand dryer equipment. Tables 4.6-5A through 4.6-5C present the estimated project annual air emissions due to the project in 2008 and 2020 at production levels of 4 million, 2.85 million, and 1.7 million tons per year respectively. Total ROG emissions from the quarry operations are significant for production levels of 4 and 2.85 million tons per year in 2008 and less than significant for the other scenarios. However, total NO:emissions from the quarry operations are significant under all production RMC Pacific Vernalis Quarry Mining and Reclamation Project .6-22 ESA/203015 Draft Environmental Impact Report May 2006