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4.Minor Revisions to the Draft Environmental Impact Report aft The types of equipment to be used in the mining and hauling of the material include the following: j • Excavators • 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 t' 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 90%paved. L Although there are operational emissions of PMio,the Valley Air District guidance does not provide for a significance threshold for PMio. 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 PMio 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 a production level of 4 million tons per year in 2008 and less than significant for the other scenarios. However,total NOx emissions from the quarry operations are significant under all production levels for 2008 and 200 2021. These results are largely due to operation of the sand V, dryer and haul truck operations,with additional contributions from the on-site equipment (especially the on-site haul trucks, excavators, and loaders).While several emission-reducing measures are currently available,the extent to which quantification of these reductions can be conducted at this time is uncertain.3 Emission-reducing measures are not available to reduce NOx L 3 The best estimations of air emission reduction efficiency for combustion sources such as haul trucks and mining equipment such as loaders and dozers are as follows: - Reduction t%) ta. Pollutant Minimum' Typical" Maximum" Particulate Matter 20 50 85 Carbon Monoxide 20 50 90 Hydrocarbons 40 50 90 ` Nitrogen Oxides 0 5 20 1 <www.epa.gov/otaq/mtrofNretrovedfiedlist.htm>(Caterpillar) 6<www.epa.gov/otaq/retrofNretrovedfiedlist.htm,(Clean Diesel Technologies,Inc) 3< .cleanairws.coMproducts.htm#PERMIT>(CleanAir) V °<w .epa.gov/otaqimtrofNretrovedfiedlist.htm>(Lubrizol) 6. Cemex Vernalis Quarry Mining and Recbmabon Project 4-45 ESA 1203015 Final Emironnental Impact Report June 2009