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Cemex Vernalis Quarty Mining and Reclamation Project REVISED TABLE 4.6-5C OPERATIONAL EMISSIONS AT A PRODUCTION LEVEL OF 1.7 MILLION TONS (Tons Per Year) Estimated Project Estimated Valley Air On-Site Emissions Project District Processing (Onsite Emissions Year Pollutant Thresholds Equipment Equipment) (Haul Trucks) Total 2008 ROG 10 1.82 1.41 1.60 4.83 _ NO. 10 2.50 13.6 21.1 37.2 PM10 - 30.7 0.52 0.73 31.9 2021 ROG 10 1.82 1.24 0.59 3.66 NO. 10 2.50 6.36 4.23 13.1 PMtc - 30.7 0.24 0.32 31.2 SOURCE: Environmental Science Associatee,KB Environmental 2007 Mitigation Measures Measure 4.6.2: While several emission-reducing measures are currently available,current proven technology limits the maximum reductions. These operational impacts are a significant impact of the project after mitigation. The project proposes to operate new equipment,both on-site nonroad equipment and haul trucks. This provides the best available operating efficiency for the equipment. Currently, additional retrofits to reduce NOx emissions below acceptable emission standards would be cost prohibitive. Catalytic particulate filters and the use of ultra low sulfur fuels do not substantially reduce NOx emissions. Impact Significance After Mitigation: Significant The applicant would use the latest equipment upon commencing mining,which would thereby implement BACT. ROG emissions would be just above the significance level in 2008 for annual production levels of 4 million tons.NOx emission would be 4 to 14 times above the significance criterion under the various scenarios analyzed in Tables 4.6-5A,B and C. Mitigation measures to reduce NOx impacts to less than significant are not _ technically feasible;thus, after mitigation this would remain a significant impact. Other technologies exist to control NOx emissions from engines, such as the use of the fuel additive PuriNOx,and/or the use of urea injection system in combination with a reducing catalyst. However,these technologies have not been widely tested in the types of engines for the project. Also,they have been known to affect engine operation efficiencies and may create secondary environmental impacts. Current control technologies associated with the — concrete,asphalt,and sand dryer equipment generally apply to fugitive dust emissions and not NOx.There are no current control technologies that when applied together would reduce the total NOx emissions from the project to less than significant(that is,a 90 percent — reduction). Cemex Verrola Quarry Mining and Reclamation Project 4A8 ESA/203015 Final Eavirar ramal Impact Report June 2008